854 results on '"Electrical mobility"'
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2. Impact of PCBM as a Third Component on Optical and Electrical Properties in Ternary Organic Blends.
- Author
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Hrostea, Laura, Oajdea, Anda, and Leontie, Liviu
- Subjects
- *
OPTICAL properties , *ATOMIC force microscopy , *LIGHT absorption , *ABSORPTION coefficients , *SOLAR cells , *CHARGE carrier mobility - Abstract
This paper investigates the influence of constituent weight ratios on optical and electrical properties, with a particular focus on the intrinsic properties (such as electrical mobility) of ternary organic blends, highlighting the role of a third component. The study explores novel donor:acceptor1:acceptor2 (D:A1:A2) matrix blends with photovoltaic potential, systematically adjusting the ratio of the two acceptors in the mixtures, while keeping constant the donor:acceptor weight ratio (D:A = 1:1.4). Herein, depending on this adjustment, six different samples of 100–400 nm thickness are methodically characterized. Optical analysis demonstrates the spectral complementarity of the component materials and exposes the optimal weight ratio (D:A1:A2 = 1:1:0.4) for the highest optical absorption coefficient. Atomic force microscopy (AFM) analysis reveals improved and superior morphological attributes with the addition of the third component (fullerene). In terms of the electrical mobility of charge carriers, this study finds that the sample in which A1 = A2 has the greatest recorded value [ μ m a x = 1.41 × 10 − 4 cm 2 / (Vs )]. This thorough study on ternary organic blends reveals the crucial relationship between acceptor ratios and the properties of the final blend, highlighting the critical function of the third component in influencing the intrinsic factors such as electrical mobility, offering valuable insights for the optimization of ternary organic solar cells. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Impact of PCBM as a Third Component on Optical and Electrical Properties in Ternary Organic Blends
- Author
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Laura Hrostea, Anda Oajdea, and Liviu Leontie
- Subjects
ternary organic films ,fullerenes ,constituents’ compatibility ,electrical mobility ,CELIV method ,Organic chemistry ,QD241-441 - Abstract
This paper investigates the influence of constituent weight ratios on optical and electrical properties, with a particular focus on the intrinsic properties (such as electrical mobility) of ternary organic blends, highlighting the role of a third component. The study explores novel donor:acceptor1:acceptor2 (D:A1:A2) matrix blends with photovoltaic potential, systematically adjusting the ratio of the two acceptors in the mixtures, while keeping constant the donor:acceptor weight ratio (D:A = 1:1.4). Herein, depending on this adjustment, six different samples of 100–400 nm thickness are methodically characterized. Optical analysis demonstrates the spectral complementarity of the component materials and exposes the optimal weight ratio (D:A1:A2 = 1:1:0.4) for the highest optical absorption coefficient. Atomic force microscopy (AFM) analysis reveals improved and superior morphological attributes with the addition of the third component (fullerene). In terms of the electrical mobility of charge carriers, this study finds that the sample in which A1 = A2 has the greatest recorded value [μmax=1.41×10−4cm2/(Vs)]. This thorough study on ternary organic blends reveals the crucial relationship between acceptor ratios and the properties of the final blend, highlighting the critical function of the third component in influencing the intrinsic factors such as electrical mobility, offering valuable insights for the optimization of ternary organic solar cells.
- Published
- 2024
- Full Text
- View/download PDF
4. Introduce Artificial Intelligence in Controlling a Solar Tracker
- Author
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Glilah, Ilias, Baraka, Ibrahim Hadj, Amami, Benaissa, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martin, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, and Ezziyyani, Mostafa, editor
- Published
- 2020
- Full Text
- View/download PDF
5. Determination of the Error in Transferring of Length Unit’s Size when Measuring the Nanoparticles’ Diameter Using an Analyzer of Particles’ Differential Electrical Mobility
- Author
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V. L. Solomakho and A. A. Bagdun
- Subjects
nanoparticles ,electrical mobility ,traceability of measurements ,diameter of nanoparticles ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The quality of nanomaterials and nanotechnologies is largely determined by the stability of the applied technologies, which, to a large extent, depend on the constancy of particle sizes. In this regard, metrological problems arise that are associated both with measuring the dimensions of the microstructure of aerosols, suspensions and powders, and with ensuring the uniformity of measurements when transferring a unit of a physical quantity from a standard to working measuring instruments. The purpose of this work was to determine and calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.An analyzer of differential electric mobility of particles was determined as a reference measuring instrument for which the calculation was made. It allows the separation of aerosol particles based on the dependence of their electrical mobility on the particle size. In combination with a condensation particle counter, it allows you to scan an aerosol and build a particle size distribution function. This measurement method is the most accurate in the field of measuring the diameters of particles in aerosols, therefore, the error in the transmission of particle size must be set as for a standard.The paper describes the physical principles of measurement by this method and presents an equation for determining the diameter of nanoparticles. Based on this equation, the sources of non-excluded systematic error were identified. Also, an experimental method was used to determine the random component of the measurement error of nanoparticles and to calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.The obtained results will be used for metrological support of standard samples of particle size, ensuring traceability of measurements of aerosol particle counters and for aerosol research.
- Published
- 2021
- Full Text
- View/download PDF
6. A fast integrated mobility spectrometer for rapid measurement of sub-micrometer aerosol size distribution, Part II: Experimental characterization
- Author
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Smith, Scott [Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.]
- Published
- 2017
- Full Text
- View/download PDF
7. A fast integrated mobility spectrometer for rapid measurement of sub-micrometer aerosol size distribution, Part I: Design and model evaluation
- Author
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Pinterich, Tamara
- Published
- 2017
- Full Text
- View/download PDF
8. Design, implementation and experimental results of an inductive power transfer system for electric bicycle wireless charging.
- Author
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Pellitteri, Filippo, Campagna, Nicola, Castiglia, Vincenzo, Damiano, Alfonso, and Miceli, Rosario
- Abstract
The use of renewable energy and the transformation of transport mode are crucial items for achieving an efficient and clean electrical mobility that allow being competitive on the market. In this context the interface between the power system and the Electric Vehicles (EVs) assumes a strategic role. Specifically, wireless energy transmission, based on Inductive Power Transfer (IPT), is an attractive solution for EVs charging. Moreover, the use of electric bicycles or kick scooters as mode of urban transport is continuously growing because they are lightweight, sustainable, easily parking, flexible and efficient transport devices. Owing to its benefits, the wireless power transfer can be considered suitable for those devices. In fact, IPT can also be exploited for Vehicle‐To‐Grid (V2G), where the wireless power flow can occur from battery to power grid as well. For E‐bike applications, bicycle‐to‐grid or bicycle‐to‐bicycle energy transfer are viable solutions by means of a Bi‐Directional Inductive Power Transfer (BDIPT). In this paper, a 300 W IPT wireless charger prototype for E‐bikes is proposed. Modelling, design, simulation and experimental results of this prototype are provided. Open‐loop and closed‐loop tests have been performed, focusing on system behaviour for different cases of load, distance and misalignment between the coils. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
9. Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor
- Author
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Davidovic, Milos, Kleut, Duška, Davidović, Milena, Stojanović, Danka, Jovašević-Stojanović, Milena, Davidovic, Milos, Kleut, Duška, Davidović, Milena, Stojanović, Danka, and Jovašević-Stojanović, Milena
- Abstract
Atmospheric aerosols in urban areas typically consist of particles of different diameters, which can range in size from a few nanometers to a few micrometers and can have a strong impact on human health [1,2]. This motivates the need to measure aerosol concentration accurately, but it is often also necessary to combine results from several instruments, with fundamentally different measurement principles. In this work, methods based on the measurement of the electrical mobility of particles, for the range of diameters from 10nm to 420nm, and the measurement of the equivalent optical diameter, for the range of diameters from 300nm to 10um, were used. Combining the overlapping region in two size distribution spectra can be used to infer equivalent optical properties of the ambient aerosol, and examples of measured and combined spectra in several urban hot spots in Bay of Kotor are analyzed in some detail. These examples will illustrate several aspects of urban aerosol properties not readily available in a typical regulatory monitoring setting, such as distribution of modes in number and mass concentration, as well as optical properties of measured aerosol. As the main result, examples of combining particle size spectrums are presented. In the process of combining the particle size spectra, it is possible to modify the distribution obtained by optical measurements by searching for the optimal value of the refractive index of the particles to obtain the best possible agreement with the size distribution obtained by measuring the electrical mobility. An equivalent refractive index as well as the equivalent shape factor of the ambient aerosol is obtained using Mie scattering theory as a theoretical framework [3]. The measurement results from the mobile monitoring campaign in Bay of Kotor in 2017 were used to elucidate the main principles of size spectrum combination, as well as to showcase diversity of equivalent optical properties of urban aerosols. Funding for this work
- Published
- 2023
10. Behavioral modeling of Wireless Power Transfer System coils.
- Author
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Stoyka, Kateryna, Di Mambro, Gennaro, Femia, Nicola, Maffucci, Antonio, Ventre, Salvatore, and Villone, Fabio
- Subjects
- *
WIRELESS power transmission , *HUMAN behavior models , *MUTUAL inductance , *GENETIC programming , *INTELLIGENT transportation systems , *GENETIC algorithms - Abstract
This paper proposes a technique to derive behavioral models for describing the mutual inductance between the coupled coils used in Wireless Power Transfer Systems for the electrical recharging of vehicles. These models describe analytically the dependence of the mutual inductance with respect to geometrical parameters related to the coils misalignments, to take into account the real operating conditions of such recharging systems. A Multi-Objective Genetic Programming (MOGP) algorithm has been adopted to discover behavioral models offering optimal trade-off between accuracy and complexity. The behavioral models are identified from a set of data evaluated by using literature analytical models and are then validated by using another set of such data and also by comparing the results with full 3D Finite Element numerical simulations. • Wireless power transfer system coils were modeled. • An analytical model was identified to describe the mutual inductance of the coils. • A multi-objective genetic programming algorithm was used to identify the model. • The model is able to easily analyze the effects of the coils misalignment on the mutual inductance. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
11. Seasonal variation in atmospheric particle electrostatic charging states determined using a parallel electrode plate device.
- Author
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Iwata, Ayumi, Fujioka, Kentaro, Yonemichi, Takuto, Fukagata, Koji, Kurosawa, Keiichi, Tabata, Ryoya, Kitagawa, Midori, Takashima, Taku, and Okuda, Tomoaki
- Subjects
- *
ATMOSPHERIC aerosols , *STRUCTURAL plates , *ENVIRONMENTAL impact analysis , *ATMOSPHERIC chemistry , *HUMIDITY - Abstract
Abstract In order to understand the electrostatic charging state of atmospheric hundreds nanometer particles that has particular impact on health, we have observed the atmospheric particles charge distributions intermittently for one year. To easily estimate particle charge distribution, first of all, we have developed a simple instrument and calculation method. We confirmed by comparison with stationary charge distributions that the distributions obtained by our method can be used to easily determine the relative variation of particle charging states, although the proportion of particles with a small charge number was quantitatively underestimated. The charge distributions of the atmospheric particles observed from April 2017 to February 2018 were different from the generally accepted stationary charge distribution. Moreover, the observed distributions changed significantly throughout the year. This variation was found to correlate with seasonal variations in temperature, relative humidity, volumetric humidity, and air mass trajectories. Present result suggests that the seasonal variation of the charging state is possibly due to the seasonal variation of the atmospheric ion number concentrations. Thus, it is important to consider the variation in the charging state of atmospheric particles due to dynamic changes of atmospheric conditions, as the charging state can dramatically influence the deposition of particles in the lungs. Highlights • The charging state of particles is important for the adverse effect on human health. • We observed the charging distributions of the atmospheric particles for one year. • The observed charging state were different from the stationary charging state. • The particles charging states at atmosphere has a seasonal variation. • These variations were correlated with variations in the atmospheric conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
12. Uniform Cs2SnI6 Thin Films for Lead-Free and Stable Perovskite Optoelectronics via Hybrid Deposition Approaches.
- Author
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Lee, Byungho, Shin, Byungha, and Park, Byungwoo
- Abstract
Abstract: Herein, we synthesized uniform Cs
2 SnI6 films by two kinds of hybrid deposition methods by considering volume expansion involved during phase transformations. First, oblique thermal evaporation for CsI followed by SnI4 spin-coating resulted in uniform Cs2 SnI6 films free of impurity phases. The rapid expansion (within 10 s of spin-coating) from CsI to Cs2 SnI6 (ΔV=106%) was accommodated by porous CsI films inhibiting crack formation. Excess SnI4 on the Cs2 SnI6 after spin-coating was effectively removed by toluene washing without any damages to Cs2 SnI6 , and optimum deposition parameters were suggested in terms of carrier mobility. Second, annealing CsI with SnI4 vapor at 250 °C and post-annealing in the SnI4 and I2 vapor at 300 °C produced Cs2 SnI6 film with complete coverage. The slow reaction (70 min for a complete conversion) provided sufficient time for complete diffusion of SnI4 into CsI without crack formation even with compact CsI. The nonradiative recombination path in Cs2 SnI6 was suppressed by post-annealing in the SnI4 - and I2 -atmosphere, as confirmed from the enhanced photoluminescence.Graphical Abstract: [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
13. Experimental and numerical study of monodisperse nanoparticles concentration in a nano-differential mobility analyzer
- Author
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Camargo, E. C. M., Lobato, F. S., Damasceno, J. J. R., and Arouca, F. O.
- Published
- 2021
- Full Text
- View/download PDF
14. Визначення механічних характеристик нанорозмірних частинок осадження в дифузійній батареї сіткового типу
- Subjects
adhesion ,particle ,дифузія ,електрична рухливість ,diffusion ,electrical mobility ,частинка ,поверхня ,surface ,адгезія - Abstract
The method for determining the mechanical and adhesion characteristics of the particle-surface system based on a comparison of the results of particle size measurements by two independent methods – by the electric mobility of particles and by the diffusion method - was proposed and experimentally tested. In the first case, the particle size was established by an Electrostatic classifier of particle (model TSI EC 3071A), and in the second case, it was measured by a screen type diffusion battery (DB) (model TSI 3041). Iodobenzene, molybdenum oxide, and tungsten oxide aerosols with particle sizes ranging from 3.05 nm to 15.4 nm in diameter were used in the experiments. Experimental data on aerosol penetration through DB were used to calculate the average value of adhesion efficiency and thermal rebound parameters of particles. The adhesion characteristics of the particle-surface system: the Gamaker constant А and specific adhesion energy sP,S were determined by using the models of particle adhesion to a flat surface., Запропоновано та експериментально перевірено метод визначення механічних та адгезійних характеристик системи частинка-поверхня, заснований на порівнянні результатів вимірювання розмірів частинок двома незалежними методами – за електричною рухливістю частинок та дифузійним методом. У першому випадку розмір частинок встановлювався електростатичним класифікатором частинок (модель TSI EC 3071A), а в другому вимірювався дифузійною батареєю (ДБ) сіткового типу (модель TSI 3041). У дослідах використані аерозолі йодбензолу, оксиду молібдену та оксиду вольфраму з розміром частинок від 3,05 нм до 15,4 нм у діаметрі. Досвідчені дані по проскоку аерозолю через ДБ використано для розрахунку середнього значення ефективності адгезії та параметрів теплового відскоку частинок R. Із застосуванням моделей адгезії частинок до плоскої поверхні визначено адгезійні характеристики системи частка-поверхня: постійна Гамакера А та питома енергія адгезії sP,S.
- Published
- 2022
15. Fractionation of solid component of welding aerosol
- Author
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V.I. Vishnyakov, M.V. Oprya, A.A. Ennan, and S.A. Kiro
- Subjects
Electrical mobility ,chemistry.chemical_compound ,Materials science ,chemistry ,Silicon ,Phase (matter) ,Specific surface area ,Analytical chemistry ,chemistry.chemical_element ,Crystallite ,Amorphous solid ,Magnetite ,Aerosol - Abstract
The design of portable filtration device with electrostatic filter and description of its work, which provides the trapping efficiency about 99.5% and fractionation of the polydisperse aerosol to four fractions via particles’ electrical mobility, are presented. The samples of aerosol particles’ fractions are obtained under usual welding regimes by welding wire Св08Г2С in CO2 and their specific surface area, element and phase compositions, phase ratio and crystallite sizes are determined. The correlation between fraction’s element composition and its specific surface area is demonstrated – the iron content is decreased, and manganese and silicon contents are increased when specific surface area is increased. The polyphase content (Fe3O4, FeO, FeMn2O4 и a-Fe are determined) and presence of the monocrystal nanosized magnetite particles, wustite and iron-manganese spinel in the fraction samples are confirmed by the X-ray analysis. The silicon compounds in particles are in amorphous state. The possibility of utilization of the nanostructured aerosol particles are proposed as a result of experimental data analysis.
- Published
- 2021
16. Mechanism of Extraordinary High Mobility in Multilayered Amorphous Oxide Thin Film Transistor
- Author
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Sang Yeol Lee and Ji Ye Lee
- Subjects
Electrical mobility ,Materials science ,business.industry ,Transistor ,Field effect ,Electronic, Optical and Magnetic Materials ,law.invention ,Amorphous solid ,Semiconductor ,law ,Thin-film transistor ,Optoelectronics ,Electrical and Electronic Engineering ,Thin film ,business ,Layer (electronics) - Abstract
Amorphous oxide-based thin-film transistors (TFTs) have been applied to display and various next-generation applications. The amorphous oxide thin film has exhibited a higher electrical mobility and stability characteristics in recent decades. A multilayer thin-film structure has been fabricated and analyzed using amorphous Si-In-Zn-O (a-SIZO) and amorphous Si-Zn-Sn-O (a-SZTO) materials. The a-SIZO had a current value of more than 10−3 A without OFF-current (like metal) when fabricated as a single layer of thin film. The fabricated bilayer TFT shows an improved field effect mobility upon inserting the a-SIZO conductive semiconductor layer at the bottom. With the aforementioned architecture, we have achieved a mobility that is higher than 160 cm2/ $\text{V}\cdot \text{s}$ with a ${V}_{\textit {th}}$ shift of 1.19 V under negative bias temperature stress (NBTS) for an amorphous-based semiconducting multilayer TFT.
- Published
- 2021
17. Determination of the Error in Transferring of Length Unit’s Size when Measuring the Nanoparticles’ Diameter Using an Analyzer of Particles’ Differential Electrical Mobility
- Author
-
A. A. Bagdun and V. L. Solomakho
- Subjects
Electrical mobility ,traceability of measurements ,Materials science ,Observational error ,business.industry ,Engineering (General). Civil engineering (General) ,Condensation particle counter ,Aerosol ,Optics ,electrical mobility ,Measuring instrument ,Particle ,nanoparticles ,Particle size ,TA1-2040 ,business ,diameter of nanoparticles ,Physical quantity - Abstract
The quality of nanomaterials and nanotechnologies is largely determined by the stability of the applied technologies, which, to a large extent, depend on the constancy of particle sizes. In this regard, metrological problems arise that are associated both with measuring the dimensions of the microstructure of aerosols, suspensions and powders, and with ensuring the uniformity of measurements when transferring a unit of a physical quantity from a standard to working measuring instruments. The purpose of this work was to determine and calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.An analyzer of differential electric mobility of particles was determined as a reference measuring instrument for which the calculation was made. It allows the separation of aerosol particles based on the dependence of their electrical mobility on the particle size. In combination with a condensation particle counter, it allows you to scan an aerosol and build a particle size distribution function. This measurement method is the most accurate in the field of measuring the diameters of particles in aerosols, therefore, the error in the transmission of particle size must be set as for a standard.The paper describes the physical principles of measurement by this method and presents an equation for determining the diameter of nanoparticles. Based on this equation, the sources of non-excluded systematic error were identified. Also, an experimental method was used to determine the random component of the measurement error of nanoparticles and to calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.The obtained results will be used for metrological support of standard samples of particle size, ensuring traceability of measurements of aerosol particle counters and for aerosol research.
- Published
- 2021
18. Effects of Starting Precursor Ratio on Optoelectrical Properties and Blue Emission of Nanostructured C-ZnS Thin Films Prepared by Spin Coating.
- Author
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Rahimzadeh, N., Ghodsi, F., and Mazloom, J.
- Subjects
ZINC sulfide ,THIN films ,SOL-gel processes ,PHOTOLUMINESCENCE ,DISPERSIVE interactions - Abstract
Nanocrystalline cubic zinc sulfide (C-ZnS) thin films have been elaborated by sol-gel spin-coating of Zn(Ac)/thiourea starting precursors at different molar ratios, and their structural, morphological, compositional, optical, electrical, and photoluminescence properties comprehensively investigated. x-ray diffraction results showed that the samples had dominant cubic structure and their crystallinity improved with increasing S content. Morphological characterization of the C-ZnS thin films was carried out by field-emission scanning electron microscopy (FESEM), revealing that the films were smooth with spherical grains included in clusters. Energy-dispersive x-ray and Fourier-transform infrared spectra of ZnS compounds did not show any evidence of impurities. Optical characterization revealed increases of the average optical transmittance and bandgap (from 3.2 eV to 3.56 eV) with increasing S content. The refractive index in the visible region increased with the S content, while the extinction coefficient decreased. The compositional dependence of the optical dispersion parameters (oscillator and dispersion energy), dielectric constant, and surface energy loss function of the films was evaluated. Electrical characterization of the films was carried out using Hall-effect measurements. The ZnS thin films exhibited n-type conductivity, and the electrical resistivity decreased with increasing carrier concentration and mobility due to enhanced crystallite size and reduced structural disorder. Photoluminescence (PL) measurements indicated a blue-shift of the near-band-edge emission. The blue emission peaks centered at about 438 nm and 487 nm were enhanced due to transitions involving interstitial S atoms, surface states, and zinc vacancies. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
19. Nanotechnologies and Environmental Risks : Measurement Technologies and Strategies
- Author
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Kuhlbusch, T. A. J., Fissan, H., Asbach, C., Linkov, Igor, editor, and Steevens, Jeffery, editor
- Published
- 2009
- Full Text
- View/download PDF
20. Overview of Size Characterization Techniques
- Author
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Merkus, Henk G., Scarlett, Brian, editor, Bellantone, Maria, editor, and Merkus, Henk G.
- Published
- 2009
- Full Text
- View/download PDF
21. Análisis de viabilidad técnica, económica y medioambiental de la electrificación de las actividades productivas de la Albufera de Valencia: planificación, evaluación y propuesta de cambios regulatorios
- Author
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Alcázar Ortega, Manuel, Ribó Pérez, David Gabriel, Universitat Politècnica de València. Departamento de Ingeniería Eléctrica - Departament d'Enginyeria Elèctrica, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Comunidad de Pescadores de El Palmar, Bejarano Cáceres, Daniel Samuel, Alcázar Ortega, Manuel, Ribó Pérez, David Gabriel, Universitat Politècnica de València. Departamento de Ingeniería Eléctrica - Departament d'Enginyeria Elèctrica, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Comunidad de Pescadores de El Palmar, and Bejarano Cáceres, Daniel Samuel
- Abstract
[ES] En los últimos años los efectos del calentamiento global en la naturaleza son cada vez más notorios. Los parques naturales y áreas protegidas como la Albufera de Valencia, hogar de una gran diversidad de flora y fauna, no son la excepción. Pues afecta tanto a las condiciones de hábitat de la flora y fauna como a la función natural que cumple los humedales. Los cuales actúan como sumideros de gases de efecto invernadero a través de la asimilación fotosintética del dióxido de carbono (CO2) de la atmósfera, entre otros. Debido a ello, y a la contaminación de los usos productivos dentro de la Albufera y alrededores debido al crecimiento urbano e industrial durante años, han contribuido al estado prolongado de eutrofización del agua que sufre el parque natural. Por ello, y debido a la importancia ecológica de la Albufera, en el presente documento se lleva a cabo una planificación de la electrificación de los usos productivos para la conserva y recuperación del ecosistema natural. Pues la electricidad es un vector de energía más eficiente que la basada en combustibles. En el presente documento se analiza la situación actual de los dos principales usos productivos de la Albufera, el regadío de los campos de arroz y la navegación debido a la pesca y al turismo, y se desarrolla y aplica una metodología para la planificación de electrificación de los mismos. Para ello se recogen datos, se identifican casos tipo para favorecer la escalabilidad de los resultados y se dimensionan los usos productivos electrificados a nivel técnico-económico y ambiental. Posteriormente, se calcula la viabilidad económica y ambiental teniendo en cuenta los beneficios e inconvenientes de la electrificación. Finalmente, se analizan los resultados y se plantean una serie de modificaciones en la normativa y líneas de subvención para su impulso., [CA] En els últims anys els efectes del calfament global en la naturalesa són cada vegada més notoris. Els parcs naturals i àrees protegides com l'Albufera de València, llar d'una gran diversitat de flora i fauna, no són l'excepció. Perquè afecta tant les condicions d'hàbitat de la flora i fauna com a la funció natural que compleix els aiguamolls. Els quals actuen com a embornals de gasos d'efecte d'hivernacle a través de l'assimilació fotosintètica del diòxid de carboni (CO₂) de l'atmosfera, entre altres. A causa d'això, i a la contaminació dels usos productius dins de l'Albufera i voltants a causa del creixement urbà i industrial durant anys, han contribuït a l'estat prolongat d'eutrofització de l'aigua que pateix el parc natural. Per això, i a causa de la importància ecològica de l'Albufera, en el present document es duu a terme una planificació de l'electrificació dels usos productius per a la conserva i recuperació de l'ecosistema natural. Perquè l'electricitat correspon un vector d'energia mes eficient que la basada en combustibles. En el present document s'analitza la situació actual dels dos principals usos productius de l'Albufera, el regadiu dels camps d'arròs i la navegació a causa de la pesca i al turisme, i es desenvolupa i aplica una metodologia per a la planificació d'electrificació d'aquests. Per a això es recullen dades, s'identifiquen casos tipus per a afavorir l'escalabilitat dels resultats i es dimensionen els usos productius electrificats a nivell tecnicoeconòmic i ambiental. Posteriorment, es calcula la viabilitat econòmica i ambiental tenint en compte els beneficis i inconvenients de l'electrificació. Finalment, s'analitzen els resultats i es plantegen una sèrie de modificacions en la normativa i línies de subvenció per al seu impuls., [EN] In recent years, the effects of global warming on nature have become increasingly noticeable. Natural parks and protected areas such as the Albufera de Valencia, home to a great diversity of flora and fauna, are no exception. It affects both the habitat conditions of flora and fauna and the natural function of wetlands. Wetlands act as greenhouse gas sinks through the photosynthetic assimilation of carbon dioxide (CO2) from the atmosphere, among other things. Due to this, and the pollution from productive uses in and around the Albufera due to urban and industrial growth over the years, they have contributed to the prolonged state of water eutrophication suffered by the natural park. For this reason, and due to the ecological importance of the Albufera, this document plans the electrification of productive uses for the conservation and recovery of the natural ecosystem. Electricity is a more efficient energy vector than fuel-based energy. This document analyses the current situation of the two main productive uses of the Albufera, the irrigation of the rice fields and navigation due to fishing and tourism and develops and applies a methodology for planning the electrification of these uses. To this end, data is collected, typical cases are identified to favour the scalability of the results and the productive uses electrified are dimensioned at a technical-economic and environmental level. Subsequently, the economic and environmental viability is calculated, taking into account the benefits and drawbacks of electrification. Finally, the results are analysed and a series of modifications to regulations and subsidy lines are proposed to promote them.
- Published
- 2022
22. New Nanoparticle Characterization Techniques by Differential Mobility Analysis
- Author
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Duelge, Kaleb John and Duelge, Kaleb John
- Abstract
Nanoparticles are being used increasingly in new fields for new applications. Thoroughcharacterization of particle properties such as size, aggregation, and mass are key to understanding particle behavior. In this dissertation I discuss a variety of new measurement approaches using the aerosol-based technique: differential mobility analysis (DMAS). This technique consists of the combination (hyphenation) of several components, the primary being an ion mobility chamber for the spatial separation of nanoparticles. The specific aerosol source and detector used is flexible and allows for wide applicability of the technique. The applications discussed here relate to a variety of everyday scenarios. Medicinal protein particles are studied to improve the health outcomes associated with this growing class of medicine. Nanoparticle catalysts are studied to improve the activity and repeatability, analogous to how a catalytic converter is used in cars to reduce combustion emissions. Detailed size measurements are made for gold nanoparticles, a class of particles that have been used for cancer treatments and as carrier particles, for example to transport medicine to a particular location within the body. Finally, determination of nanoparticle size is studied by comparing results from different instruments, as determining size in the nanometer scale is more complicated than an analogous measurement of a macroscopic sphere (for example, measuring the length with a ruler and comparing the result to the length derived from the mass of a sphere with a known density). In the second chapter, I demonstrate protein aggregation kinetics measurements by DMAS and asymmetrical flow field flow fractionation. Thermal aggregation was conducted in traditional formulation buffers and good agreement was determined between the two techniques. These are potential alternative instruments to the gold standard, size exclusion chromatography, used by the biopharmaceutical industry. In the third chapter
- Published
- 2022
23. Online Size Characterization of Nanofibers and Nanotubes
- Author
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Unrau, C. J., Axelbaum, R. L., Biswas, P., Fraundorf, P., Mansoori, G. Ali, editor, George, Thomas F., editor, Assoufid, Lahsen, editor, and Zhang, Guoping, editor
- Published
- 2007
- Full Text
- View/download PDF
24. Behavioral modeling of Wireless Power Transfer System coils
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Salvatore Ventre, Fabio Villone, Antonio Maffucci, Gennaro Di Mambro, Kateryna Stoyka, and Nicola Femia
- Subjects
Coupled coils ,Numerical Analysis ,General Computer Science ,Computer science ,Electrical mobility ,Applied Mathematics ,Behavioral modeling ,Genetic programming ,010103 numerical & computational mathematics ,02 engineering and technology ,Inductive power transfer ,01 natural sciences ,Finite element method ,Theoretical Computer Science ,Inductance ,Set (abstract data type) ,Modeling and Simulation ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,020201 artificial intelligence & image processing ,Wireless power transfer ,0101 mathematics - Abstract
This paper proposes a technique to derive behavioral models for describing the mutual inductance between the coupled coils used in Wireless Power Transfer Systems for the electrical recharging of vehicles. These models describe analytically the dependence of the mutual inductance with respect to geometrical parameters related to the coils misalignments, to take into account the real operating conditions of such recharging systems. A Multi-Objective Genetic Programming (MOGP) algorithm has been adopted to discover behavioral models offering optimal trade-off between accuracy and complexity. The behavioral models are identified from a set of data evaluated by using literature analytical models and are then validated by using another set of such data and also by comparing the results with full 3D Finite Element numerical simulations.
- Published
- 2021
25. Determination of the Mean Mobility and Estimation of the Mobility Distribution of Aerosols with a Concentric-Cylindrical Electrostatic Precipitator
- Author
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Ibarra, I., Rodríguez Maroto, J. J., and Alonso, M.
- Published
- 2020
- Full Text
- View/download PDF
26. A Build-In Data Inversion Method to Retrieve Aerosol Size Distributions for a Portable Ultrafine Particle Sizer (PUPS)
- Author
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Jitong Zhou, Huanqin Wang, Deyi Kong, Da-Ren Chen, Huaqiao Gui, Chen Mingjie, Jianguo Liu, Jie Yang, and Yu Fajun
- Subjects
Electrical mobility ,Materials science ,010504 meteorology & atmospheric sciences ,General Computer Science ,General Engineering ,Inverse transform sampling ,Multiple charging ,010501 environmental sciences ,01 natural sciences ,Stability (probability) ,Least squares ,classification voltages ,post facto smoothing ,Aerosol ,synthesized data ,Differential mobility analyzer ,Particle ,excessive overlap ,General Materials Science ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:TK1-9971 ,Algorithm ,Smoothing ,0105 earth and related environmental sciences - Abstract
A build-in data inversion method to retrieve aerosol size distributions based on the principle of particle electrical mobility has been introduced, whose required computational effort is low for a portable ultrafine particle sizer (PUPS). The PUPS is cost-effective for the measurements of the fine and ultrafine particles in polluted environments near-source (e.g., cities with high traffic density, freeways, airports or stationary combustion sources). The particle sizer is mainly composed of a unipolar charger, a plate differential mobility analyzer (PDMA), and a Faraday cup electrometer (FCE). The classification efficiencies of the PDMA are strongly dependent on the charging distribution of the unipolar charger, in which multiple charging is more significant than that for a bipolar charger. To reduce the excessive overlap in the kernel function caused by multiple charging, a guidance method for selecting the classification voltages and operating parameters of the PDMA is proposed with the help of MATLAB. Subsequently, a combination of the nonnegative least squares (NNLS) algorithm and post facto smoothing method has been employed to derive the discretized solution of the Fredholm integral equation of the first kind. In the end, the accuracy and stability of the proposed approach are tested under a range of particle size distribution scenarios. The synthesized data results show that for the unimodal aerosol distribution, almost all of the relative errors are less than 20 %, regardless of nonideal operating conditions. The inversion algorithm can be run on Cortex-M3, an ARM embedded chip for low-cost and low-power consumption applications. When a reasonable error range can be permitted, the inversion algorithm can meet the requirements of the PUPS.
- Published
- 2021
27. Hydrogen-Assisted Fast Growth of Large Graphene Grains by Recrystallization of Nanograins
- Author
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Jinwook Baek, Seokwoo Jeon, Jong Min Yuk, Kyun Seong Dae, and Hyunjong Lee
- Subjects
Electrical mobility ,Materials science ,Misorientation ,Hydrogen ,Graphene ,General Chemical Engineering ,Recrystallization (metallurgy) ,chemistry.chemical_element ,Nanotechnology ,General Chemistry ,Chemical vapor deposition ,Article ,law.invention ,Grain growth ,Chemistry ,chemistry ,law ,Grain boundary ,QD1-999 - Abstract
Chemical vapor deposition has been highlighted as a promising tool for facile graphene growth in a large area. However, grain boundaries impose detrimental effects on the mechanical strength or electrical mobility of graphene. Here, we demonstrate that high-pressure hydrogen treatment in the preannealing step plays a key role in fast and large grain growth and leads to the successful synthesis of large grain graphene in 10 s. Large single grains with a maximum size of ∼160 μm grow by recrystallization of nanograins, but ∼1% areal coverage of nanograins remains with 28-30° misorientation angles. Our findings will provide insights into mass production of high-quality graphene.
- Published
- 2020
28. A Fast Integrated Mobility Spectrometer for rapid measurement of sub-micrometer aerosol size distribution, Part II: Experimental characterization.
- Author
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Wang, Jian, Pikridas, Michael, Pinterich, Tamara, Spielman, Steven R., Tsang, Thomas, McMahon, Andrew, and Smith, Scott
- Subjects
- *
SPECTROMETERS , *PARTICLE size distribution , *AEROSOLS , *CONDENSATION , *PARTICLE concentration (Atmospheric chemistry) - Abstract
A Fast Integrated Mobility Spectrometer (FIMS) with a wide dynamic size range has been developed for rapid aerosol size distribution measurements. The design and model evaluation of the FIMS are presented in the preceding paper (Paper I, Wang et al., 2017 ), and this paper focuses on the experimental characterization of the FIMS. Monodisperse aerosol with diameter ranging from 8 to 600 nm was generated using a Differential Mobility Analyzer (DMA), and was measured by the FIMS in parallel with a Condensation Particle Counter (CPC). The mean particle diameter measured by the FIMS is in good agreement with the DMA centroid diameter. Comparison of the particle concentrations measured by the FIMS and CPC indicates the FIMS detection efficiency is essentially 100% for particles with diameters of 8 nm or larger. For particles smaller than 20 nm or larger than 200 nm, FIMS transfer function and mobility resolution can be well represented by the calculated ones based on simulated particle trajectories in the FIMS. For particles between 20 and 200 nm, the FIMS transfer function is boarder than the calculated, likely due to non-ideality of the electric field, including edge effects near the end of the electrode, which are not represented by the 2-D electric field used to simulate particle trajectories. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
29. A fast integrated mobility spectrometer for rapid measurement of sub-micrometer aerosol size distribution, Part I: Design and model evaluation.
- Author
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Wang, Jian, Pikridas, Michael, Spielman, Steven R., and Pinterich, Tamara
- Subjects
- *
SPECTROMETERS , *PARTICLE size distribution , *AEROSOLS , *ELECTRIC fields , *TRANSFER functions - Abstract
A fast integrated mobility spectrometer (FIMS) was previously developed to characterize submicron aerosol size distributions at a frequency of 1 Hz and with high size resolution and counting statistics ( Kulkarni & Wang, 2006a, 2006b ; Olfert, Kulkarni, & Wang, 2008 ). However, the dynamic size range of the FIMS was limited to one decade in particle electrical mobility. It was proposed that the FIMS dynamic size range can be greatly increased by using a spatially varying electric field ( Wang, 2009 ). This electric field creates regions with drastically different field strengths in the separator, such that particles of a wide diameter range can be simultaneously classified and subsequently measured. A FIMS incorporating this spatially varying electric field is developed. This paper describes the theoretical frame work and numerical simulations of the FIMS with extended dynamic size range, including the spatially varying electric field, particle trajectories, activation of separated particles in the condenser, and the transfer function, transmission efficiency, and mobility resolution. The influences of the particle Brownian motion on FIMS transfer function and mobility resolution are examined. The simulation results indicate that the FIMS incorporating the spatially varying electric field is capable of measuring aerosol size distribution from 8 to 600 nm with high time resolution. The experimental characterization of the FIMS is presented in an accompanying paper. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
30. Influence of the dry aerosol particle size distribution and morphology on the cloud condensation nuclei activation. An experimental and theoretical investigation
- Author
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Pascale Desgroux, Jérôme Yon, Denis Petitprez, Sebastien Batut, Junteng Wu, Alessandro Faccinetto, Symphorien Grimonprez, Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 (PC2A), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université de Lille, CNRS, Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 [PC2A], Université de Rouen Normandie [UNIROUEN], Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), and Normandie Université (NU)
- Subjects
Atmospheric Science ,Electrical mobility ,Materials science ,010504 meteorology & atmospheric sciences ,Analytical chemistry ,02 engineering and technology ,Köhler theory ,medicine.disease_cause ,01 natural sciences ,lcsh:Chemistry ,[SPI]Engineering Sciences [physics] ,medicine ,[CHIM]Chemical Sciences ,Cloud condensation nuclei ,ComputingMilieux_MISCELLANEOUS ,Physics::Atmospheric and Oceanic Physics ,0105 earth and related environmental sciences ,[PHYS]Physics [physics] ,Supersaturation ,[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,021001 nanoscience & nanotechnology ,lcsh:QC1-999 ,Soot ,Aerosol ,lcsh:QD1-999 ,[SDE]Environmental Sciences ,Particle-size distribution ,Particle ,0210 nano-technology ,lcsh:Physics - Abstract
Combustion and other high-temperature processes frequently result in the emission of aerosols in the form of polydisperse fractal-like aggregates made of condensed-phase nanoparticles (soot for instance). If certain conditions are met, the emitted aerosol particles are known to evolve into important cloud condensation nuclei (CCN) in the atmosphere. In this work, the hygroscopic parameter κ of complex morphology aggregates is calculated from the supersaturation-dependent activated fraction Fa=Fa(SS) in the frame of κ-Köhler theory. The particle size distribution is approximated with the morphology-corrected volume equivalent diameter calculated from the electrical mobility diameter by taking into account the diameter of the primary particle and the fractal dimension of the aggregate experimentally obtained from transmission electron microscopy measurements. Activation experiments are performed in water supersaturation conditions using a commercial CCN-100 condensation nuclei counter. The model is tested in close-to-ideal conditions of size-selected, isolated spherical particles (ammonium sulfate nanoparticles dispersed in nitrogen), then with complex polydisperse fractal-like aggregates (soot particles activated by exposure to ozone with κ as low as 5×10-5) that represent realistic anthropogenic emissions in the atmosphere.
- Published
- 2020
31. Enhanced Electrical Mobilities of Laser Annealed Ga Doped ZnO Thin Films
- Author
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Jae-Geun Ha, Masao Kamiko, Jung-Hyuk Koh, Jihye Kang, Sang-Mo Koo, and GaeHun Jo
- Subjects
Spin coating ,Electrical mobility ,Materials science ,Dopant ,business.industry ,Doping ,Biomedical Engineering ,Bioengineering ,General Chemistry ,Condensed Matter Physics ,Electrical resistivity and conductivity ,Transmittance ,Optoelectronics ,General Materials Science ,Thin film ,business ,Wurtzite crystal structure - Abstract
In this study, Ga-doped ZnO thin films were prepared, and their potential for transparent conducting oxide applications was assessed. To increase the electrical mobility and reduce the resistance of Ga-doped ZnO thin films, CO₂ laser annealing was employed. Recently, the use of transparent conducting oxides (TCOs) have increased, particularly ZnO-based TCOs have been intensively investigated for display applications. To enhance the electrical and optical properties of ZnO thin films, Ga was used as a dopant. First, Ga-doped ZnO thin-film precursors were prepared by the sol-gel method. Subsequently, Ga-doped ZnO thin films were coated on glass substrates by spin coating. Electrical furnace treatment and rapid thermal annealing were employed to obtain and anneal a wurtzite ZnO based structure. The electrical and optical properties of the annealed thin films were optimized by varying the Ga doping concentration. Via Ga doping and optimized laser annealing, the resistivity of the ZnO film could be decreased from 16.32 Ω· cm to 0.45 Ω·cm; notably, the transmittance was similar (85%) in the 380-800 nm range. The transmittance properties of the films are not presented in this paper. Moreover, after an optical CO₂ laser annealing process, the conductivity of the films improved by more than 40 times. Furthermore, the electrical properties (mobility, resistivity, and bulk and sheet concentrations) of the CO₂-laser-annealed Ga-doped ZnO thin films were optimized.
- Published
- 2020
32. Diesel and welding aerosols in an underground mine
- Author
-
Jon A. Hummer, Teresa Barone, and Aleksandar D. Bugarski
- Subjects
lcsh:TN1-997 ,Electrical mobility ,Welding aerosols ,0211 other engineering and technologies ,Underground mining (hard rock) ,Energy Engineering and Power Technology ,Shielded metal arc welding ,02 engineering and technology ,Welding ,complex mixtures ,Article ,law.invention ,Diesel fuel ,020401 chemical engineering ,Geochemistry and Petrology ,law ,0204 chemical engineering ,lcsh:Mining engineering. Metallurgy ,021101 geological & geomatics engineering ,Metallurgy ,technology, industry, and agriculture ,Size distribution ,respiratory system ,Geotechnical Engineering and Engineering Geology ,Welding process ,Diesel aerosols ,Environmental science ,Underground mining - Abstract
Researchers from the National Institute for Occupational Safety and Health (NIOSH) conducted a study in an isolated zone of an underground mine to characterize aerosols generated by: (1) a diesel-powered personnel carrier vehicle operated over a simulated light-duty cycle and (2) the simulated repair of existing equipment using manual metal arc welding (MMAW). Both the diesel-powered vehicle and MMAW process contributed to concentrations of nano and ultrafine aerosols in the mine air. The welding process also contributed to aerosols with electrical mobility and aerodynamic mobility count median diameters of approximately 140 and 480 nm, respectively. The welding particles collected on the filters contained carbon, iron, manganese, calcium, and aluminum.
- Published
- 2020
33. Characterization of Submicron Oil Mist Particles Generated by Metal Machining Processes
- Author
-
Hidenori Higashi, Yayoi Inomata, Kojiro Hirai, Kanta Fukumori, Moriaki Iwasaki, and Takafumi Seto
- Subjects
Electrical mobility ,Materials science ,010504 meteorology & atmospheric sciences ,Metallurgy ,Oil mist ,01 natural sciences ,Pollution ,Grinding ,Machining ,Ultrafine particle ,Emulsion ,Environmental Chemistry ,Lubricant ,0105 earth and related environmental sciences ,Leakage (electronics) - Abstract
The number size distributions of submicron oil mist particles generated by three industrial metal (steel) machining processes—lathe machining, cutting, and grinding—were measured using an electrical mobility analyzer and an optical particle spectrometer. The measured number concentration of ultrafine particles (UFP; ~30 nm diameter) reached 107 particles cm–3 during each machining process. The condensation of thermally evaporated oil vapor was considered to be a major route of ultrafine particle generation during lathe machining and grinding, which used an oil-in-water emulsion and an insoluble lubricant oil, respectively. Cutting, which did not use lubricant oil, also produced a steep increase in the number concentration of UFP; these particles may have formed from residual oil-in-water emulsion on the surface of the workpiece after lathe machining. A simplified numerical simulation was used to quantify the particles arising from machining and leakage when the apparatus was opened. Although local ventilation effectively reduced the concentration of the oil mist in the apparatus and prevented the diffusion of this substance when the apparatus door was opened, leakage was observed when the workpieces were exchanged; this leakage was attributed to entrained particles on the workpieces. Hence, countermeasures to prevent entrained oil mist are necessary to improve the air quality in working environments.
- Published
- 2020
34. Análisis de viabilidad técnica, económica y medioambiental de la electrificación de las actividades productivas de la Albufera de Valencia: planificación, evaluación y propuesta de cambios regulatorios
- Author
-
Bejarano Cáceres, Daniel Samuel
- Subjects
Viabilidad ,Regulación ,Eficiència ,Electrical mobility ,Medi ambient ,Movilidad eléctrica ,Efficiency ,Máster Universitario en Ingeniería Industrial (Acceso desde Grado I. de la Energía)-Màster Universitari en Enginyeria Industrial (Accés des de Grau I. de l'Energia) ,Environment ,Sostenibilidad ,Albufera ,Eficiencia ,Mobilitat elèctrica ,Transició energètica ,Electrificación ,Medio ambiente ,INGENIERIA ELECTRICA ,Transicición energética ,Valencia ,Planificación ,Energy transition - Abstract
[ES] En los últimos años los efectos del calentamiento global en la naturaleza son cada vez más notorios. Los parques naturales y áreas protegidas como la Albufera de Valencia, hogar de una gran diversidad de flora y fauna, no son la excepción. Pues afecta tanto a las condiciones de hábitat de la flora y fauna como a la función natural que cumple los humedales. Los cuales actúan como sumideros de gases de efecto invernadero a través de la asimilación fotosintética del dióxido de carbono (CO2) de la atmósfera, entre otros. Debido a ello, y a la contaminación de los usos productivos dentro de la Albufera y alrededores debido al crecimiento urbano e industrial durante años, han contribuido al estado prolongado de eutrofización del agua que sufre el parque natural. Por ello, y debido a la importancia ecológica de la Albufera, en el presente documento se lleva a cabo una planificación de la electrificación de los usos productivos para la conserva y recuperación del ecosistema natural. Pues la electricidad es un vector de energía más eficiente que la basada en combustibles. En el presente documento se analiza la situación actual de los dos principales usos productivos de la Albufera, el regadío de los campos de arroz y la navegación debido a la pesca y al turismo, y se desarrolla y aplica una metodología para la planificación de electrificación de los mismos. Para ello se recogen datos, se identifican casos tipo para favorecer la escalabilidad de los resultados y se dimensionan los usos productivos electrificados a nivel técnico-económico y ambiental. Posteriormente, se calcula la viabilidad económica y ambiental teniendo en cuenta los beneficios e inconvenientes de la electrificación. Finalmente, se analizan los resultados y se plantean una serie de modificaciones en la normativa y líneas de subvención para su impulso., [CA] En els últims anys els efectes del calfament global en la naturalesa són cada vegada més notoris. Els parcs naturals i àrees protegides com l'Albufera de València, llar d'una gran diversitat de flora i fauna, no són l'excepció. Perquè afecta tant les condicions d'hàbitat de la flora i fauna com a la funció natural que compleix els aiguamolls. Els quals actuen com a embornals de gasos d'efecte d'hivernacle a través de l'assimilació fotosintètica del diòxid de carboni (CO₂) de l'atmosfera, entre altres. A causa d'això, i a la contaminació dels usos productius dins de l'Albufera i voltants a causa del creixement urbà i industrial durant anys, han contribuït a l'estat prolongat d'eutrofització de l'aigua que pateix el parc natural. Per això, i a causa de la importància ecològica de l'Albufera, en el present document es duu a terme una planificació de l'electrificació dels usos productius per a la conserva i recuperació de l'ecosistema natural. Perquè l'electricitat correspon un vector d'energia mes eficient que la basada en combustibles. En el present document s'analitza la situació actual dels dos principals usos productius de l'Albufera, el regadiu dels camps d'arròs i la navegació a causa de la pesca i al turisme, i es desenvolupa i aplica una metodologia per a la planificació d'electrificació d'aquests. Per a això es recullen dades, s'identifiquen casos tipus per a afavorir l'escalabilitat dels resultats i es dimensionen els usos productius electrificats a nivell tecnicoeconòmic i ambiental. Posteriorment, es calcula la viabilitat econòmica i ambiental tenint en compte els beneficis i inconvenients de l'electrificació. Finalment, s'analitzen els resultats i es plantegen una sèrie de modificacions en la normativa i línies de subvenció per al seu impuls., [EN] In recent years, the effects of global warming on nature have become increasingly noticeable. Natural parks and protected areas such as the Albufera de Valencia, home to a great diversity of flora and fauna, are no exception. It affects both the habitat conditions of flora and fauna and the natural function of wetlands. Wetlands act as greenhouse gas sinks through the photosynthetic assimilation of carbon dioxide (CO2) from the atmosphere, among other things. Due to this, and the pollution from productive uses in and around the Albufera due to urban and industrial growth over the years, they have contributed to the prolonged state of water eutrophication suffered by the natural park. For this reason, and due to the ecological importance of the Albufera, this document plans the electrification of productive uses for the conservation and recovery of the natural ecosystem. Electricity is a more efficient energy vector than fuel-based energy. This document analyses the current situation of the two main productive uses of the Albufera, the irrigation of the rice fields and navigation due to fishing and tourism and develops and applies a methodology for planning the electrification of these uses. To this end, data is collected, typical cases are identified to favour the scalability of the results and the productive uses electrified are dimensioned at a technical-economic and environmental level. Subsequently, the economic and environmental viability is calculated, taking into account the benefits and drawbacks of electrification. Finally, the results are analysed and a series of modifications to regulations and subsidy lines are proposed to promote them.
- Published
- 2022
35. A Passive Sampler for Monitoring Urban Particulate: Preliminary Results
- Author
-
Brown, R. C., Thorpe, A., Hemingway, M. A., and Sokhi, Ranjeet S., editor
- Published
- 1998
- Full Text
- View/download PDF
36. Particle Deposition in Plasma
- Author
-
Adachi, Motoaki, Okuyama, Kikuo, and Hattori, Takeshi, editor
- Published
- 1998
- Full Text
- View/download PDF
37. Determination of the Mean Mobility and Estimation of the Mobility Distribution of Aerosols with a Concentric-Cylindrical Electrostatic Precipitator
- Author
-
M. Alonso, I. Ibarra, and J. J. Rodríguez Maroto
- Subjects
Particle size measurement ,Physics ,Electrical mobility ,MonteCarlo simulation ,Monte Carlo method ,Electrostatic precipitator ,Mechanics ,Pollution ,Standard deviation ,Aerosol ,Flow velocity ,Aspiration condenser ,Log-normal distribution ,Environmental Chemistry ,General Materials Science ,Physics::Atmospheric and Oceanic Physics ,Brownian motion ,Electrostatic precipitation - Abstract
Concentric-cylindrical electrical condensers, commonly employed in laboratory research work to precipitate charged aerosol particles (electrostatic precipitator, ESP), can also be used to measure the mean electric mobility of the aerosol and to estimate its mobility distribution. A theoretical research has been carried out to describe the performance of an ESP and its application to the determination of aerosol mobility distribution. Two main equations have been derived: the transfer function, i.e. the probability that a particle of a given mobility is transmitted through the ESP; and, from it, the basic equation describing the performance of the precipitator, the penetration–voltage equation. These equations are valid for whatever shape of the flow velocity profile. MonteCarlo simulations have been carried out to compute the penetration–voltage curve and found to be in excellent agreement with the analytical equations. The parameters (geometric mean and standard deviation) of aerosols with lognormal mobility distributions can be estimated with certain accuracy as long as the distribution width is not too large. Finally, the effect of Brownian diffusion (not taken into account in the theoretical model) has been considered in the MonteCarlo simulations and found to be negligible provided that proper ESP geometric dimensions and aerosol flow rate are used.
- Published
- 2019
38. The effect of water spray on the release of composite nano-dust
- Author
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Christof Asbach, Jin Won Seo, Stevan M. Cokic, Bart Van Meerbeek, Kirsten Van Landuyt, Peter Hoet, and Jan De Munck
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Electrical mobility ,Materials science ,Composite number ,Analytical chemistry ,Water ,Nanoparticle ,Dust ,030206 dentistry ,Grain size ,Grinding ,03 medical and health sciences ,0302 clinical medicine ,Maschinenbau ,Scanning mobility particle sizer ,030220 oncology & carcinogenesis ,Nanoparticles ,Particle ,Particle size ,Particle Size ,General Dentistry - Abstract
To evaluate the collection efficiency of water spray on the release of airborne composite particles during grinding of composite materials. Composite sticks (L:35 mm × W:5.4 mm × H:1.6 mm) of seven commercial dental composites were ground with a rough diamond bur (grain size 100 μm, speed 200,000 rpm). All experiments were performed in an enclosed 1-m3 chamber with low particulate background (< 1,000 #/cm3), and airborne particles were evaluated based on their electrical mobility. The number size distribution was determined by scanning mobility particle sizer (SMPS). Particles were collected by an electrostatic precipitator (ESP), and were ultramorphologically and chemically analyzed by a transmission electron microscope equipped with energy-dispersive X-ray spectroscopy (TEM-EDS). SMPS measurements confirmed that both dry and wet grinding generated high concentrations of nanoparticles particles with the highest concentration recorded during the last minute of grinding (1.80 × 106 − 3.29 × 106#/cm3), after which a gradual decline in particle concentration took place. Nevertheless, grinding with water spray resulted in a significant reduction of the number of released particles (5.6 × 105 − 1.37 × 106#/cm3). The smallest particle diameter was recorded during the last minute of grinding followed by a continuous growth for every next measurement. TEM of composite dust revealed a high concentration of particles varying in both size and shape. Regardless of whether the water cooling spray system was used during bur manipulation of composite materials, predominately nanoparticles were released. However, the particle concentrations were significantly decreased with water spray. Clinical relevance: Since water spray might not be sufficient in nanoparticle collection, special care should be taken to prevent inhalation of composite dust.
- Published
- 2019
39. Estimation of possibility of applying electric buses in Kharkiv
- Subjects
електрична мобільність ,енергоефективність ,hybrid bus ,ComputerSystemsOrganization_MISCELLANEOUS ,electric bus ,electrical mobility ,battery charge ,energy efficiency ,diesel bus - Abstract
The chief characteristics of electric buses in terms of efficiency, environmental friendliness, and convenience for passengers are analyzed. It makes it possible to speak of advantages of electric transport compared with transportation means on traditional fuels. Considering the issue of rational application of electric buses in cities, it is possible to rely on European cities’ positive experience. Ever more and more of developed countries all over the world use ecological transport in the urban transportation networks. On the example of the studied Polish cities, namely Katowice, a positive trend in the growth of electric buses application in the city’s transportation grid can be observed, which enables the authors to conclude that the city of Kharkiv alsohas a great technical potential for introducing electric buses to the city routes network. Electric buses are already starting to appear in several cities of Ukraine in the transport network, but it is necessary to increase the percentage of ecological buses, to develop certain concepts and strategies to increase this type of transport., Аналізуються головні характеристики електричних автобусів з точки зору енергоефективності, екологічності, зручності для пасажирів. Це дає змогу говорити про перевагу екологічних транспортних засобів перед транспортними засобами на традиційному виді палива. Розглядаючи питання раціонального використання електроавтобусів у містах, можна посилатись на позитивний досвід європейських міст. Все більше і більше розвинутих країн всього світу використовують на міській мережі екологічний транспорт. На прикладі розглянутих польських міст, зокрема міста Катовіце, простежується позитивна тенденція збільшення числа електричних автобусів на транспортній мережі міста, що дає змогу говорити, що місто Харків також має великий технічний потенціал для впровадження електричних автобусів у міську маршрутну мережу.
- Published
- 2021
- Full Text
- View/download PDF
40. Particle Counting and Particle Size Analysis
- Author
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Holländer, Werner, Hutzinger, Otto, editor, Kouimtzis, T., editor, and Samara, C., editor
- Published
- 1995
- Full Text
- View/download PDF
41. An overview of differential mobility analyzers for size classification of nanometer-sized aerosol particles
- Author
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Nakorn Tippayawong and Panich Intra
- Subjects
aerosol ,differential mobility analyzer ,electrical mobility ,nanoparticles ,nanotechnology ,Technology ,Technology (General) ,T1-995 ,Science ,Science (General) ,Q1-390 - Abstract
Size classification of nanoparticles is an important process in the electrical mobility particle size analyzer. The differential mobility analyzer (DMA) is one of the most commonly used devices for classifying and measuring nanometersized aerosol particles between 1 nm to 1 μm in diameter, based on their electrical mobility. The DMA can be described as an assembly of two concentrically cylindrical electrodes with an air gap between the walls. In the DMA, air and aerosol flows enter from one end, pass through the annulus and exit the other end. An electric field is applied between the inner and outer electrodes. Particles having a specific mobility exit with the monodisperse air flow through a small slit located at the bottom of the inner electrode. These particles are transferred to a particle counter to determine the particle number concentration. In the past several decades, there have been numerous extensive studies and developments on the DMA. Nonetheless, they are different in terms of specific applications, construction, particle size range, as well as time response and resolution. The purpose of this article is to provide an overview of the state-of-the-art existing cylindrical DMAs for aerosol particle size classification as well as for the generation of monodisperse aerosol in nanometer size range. A description of the operating principles, detailed physical characteristics of these DMAs, including the single-channel and multi-channel DMAs, as well as some examples of applications to nanotechnology are given.
- Published
- 2008
42. Technical Note: Real-Time Diagnosis of the Hygroscopic Growth Micro-Dynamics of Nanoparticles with Two-Dimensional Correlation Infrared Spectroscopy
- Author
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Huaqiao Gui, Yang Yixin, Yin Cheng, Jianguo Liu, Wei Xiuli, Youwen Sun, Haosheng Dai, Zhang Jiaoshi, and Wang Jie
- Subjects
Phase transition ,Electrical mobility ,Materials science ,Absorption spectroscopy ,Chemical physics ,Infrared spectroscopy ,Cloud condensation nuclei ,Nanoparticle ,Fourier transform infrared spectroscopy ,Light scattering - Abstract
Nanoparticles can absorb water to grow up and this will affect the light scattering behavior, cloud condensation nuclei properties, lifetime, and chemical reactivity of these particles. Current techniques usually assume the shapes of nanoparticles to be spherical in calculation of aerosol liquid water content (ALWC), which may result in large uncertainties when the shapes of nanoparticles show large deviations to the spherical assumptions. Furthermore, current techniques are also difficult to identify the intermolecular chemical interactions of phase transition micro-dynamics during nanoparticle deliquescence process because their limited temporal resolutions are unable to capture the complex femtosecond-level intermediate states. In this study, the hygroscopic growth properties of nanoparticles with electrical mobility diameter of approximately 100 nm and their phase transition interaction dynamics on molecular scale are characterized on real time by using the Fourier transform infrared (FTIR) and the two-dimensional correlation infrared (2D-IR) spectroscopic techniques. With the FTIR spectroscopy, we develop a novel real-time method for ALWC by constructing the absorption spectra of liquid water, and realized real-time measurements of water content and dry nanoparticle mass to characterize the hygroscopic growth factors (GF) which show discrepancies to the extended aerosol inorganics model (E-AIM). We further explore the difference that the deliquescence points of sodium nitrate (SN) and oxalic acid (OA) compounds are lower than that of AS by using the 2D-IR spectroscopic analysis technique. We also identify the occurrence sequential order of the hydration interactions and investigate the dynamic deliquescence process of the functional groups for AS and its mixture compounds. Both SN and OA compounds lower the deliquescence point of AS, but only AN can change the hydrolysis reaction mechanism for AS in AS/AN and AS/OA mixtures. This study can not only provide important information with respect to the difference in phase transition point under different conditions, but also improve current understanding of the chemical interaction mechanism between nanoparticles (particularly for organic particles) and medium, which is of great significance for haze control across China.
- Published
- 2021
43. Suitable Design for Electromagnetic Pulse Processes
- Author
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Marschner, O., Pabst, C., Schäfer, R., and Pasquale, P.
- Subjects
welding ,crimping ,electrical mobility ,electromagnetic pulse processes - Abstract
Basic conventional production processes, such as arc welding or forming, are more or less thoroughly investigated, reliable process guidelines have been developed and trained engineers are available. This allows them to be put into use usually fast, thus facilitating a wide application. The usage of electromagnetic pulse processes, on the contrary, still lacks a broad propagation. Despite having a history reaching back several decades, these processes are mostly limited to niche applications. Admittedly, theoretical considerations have been made and various experiments have been carried out. However, when a given joining or forming task needs to be realized with electro-magnetic force, a huge invest is necessary even before the first part is made. This involves the design of the machine, especially of the tool coil, as well as the design of the workpieces to be processed. In industrial environmentsthis challenge is tackled step by step: After the theoretical product concept in close collaboration with the customer, numerical and experimental trials are carried out. In many cases, iterations are necessary and both geometry and process are optimized. The experimental trials can be conducted with universal sheet welding tool coils or tube compression tool coils with custom field shapers. This procedure allows keeping the prototyping costs low, but at the same time provides valid information on the feasibility in general, the requirements to the workpieces, the design of the tool coil and the properties of the pulse generator. Subsequently, the tool coil is designed and manufactured according to the prior findings. The pulse generator as modular component is assembled and adapted to the customer’s requirements. The iterative product and process design is the most important phase of the whole procedure, which is in accordance with good project management. It significantly lowers the risk of an expensive project cancellation during the late steps.
- Published
- 2021
- Full Text
- View/download PDF
44. Advances in electrical high current connections for electrical propulsion systems
- Author
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Marschner, O., Pabst, C., and Pasquale, P.
- Subjects
welding ,crimping ,electrical mobility ,electromagnetic pulse processes - Abstract
Many countries strongly support electric propulsion for various fields of transportation, be it people or goods on land, at sea or in the air. Although electric drive systems appear much simpler than (internal) combustion systems, they exhibit their own challenging development tasks. This becomes obvious when an ever-increasing efficiency, performance or production rate is required, just to name a few. The new challenges can be tackled with the help of new electromagnetic manufacturing processes. High speed processes with their well-known unique capabilities offer promising approaches. However, development is required in order to deliver the required performance. High-speed forming with electromagnetic tools allows the production of sharp-edged battery housings. For body panels, sharp edges are mainly a design feature. For batteries, however, sharp edges allow for an almost ideally rectangular housing, enabling a higher energy density. Increases in the range of up to 10 % are achievable. When it comes to packaging, the liquid cooling and heating of battery packs is of equally large importance. The channels for the medium must not consume too much space. The integration of channels inside the aluminium or steel frame of the battery pack is a promising approach. Due to the high welding speeds of up to 500 mm per second at optimum conditions and at the same time the ability to weld aluminium to aluminium or even steel without any loss in strength, electromagnetic pulse welding offers a promising solution. The conduction of high electrical currents with for example the strong demand to save weight and thus use as little material as possible also requires new processes. Electromagnetic pulse welding of aluminium to aluminium and aluminium to copper is well known, investigated and already used in mass production. However, this is suitable for bus bars only. The connection of terminals to cables is mostly done by crimping. Using a pulsed force for crimping improves the compaction and thus the resistance of the joint, especially of cables with large cross sections. This allows for smaller connectors and reduced cable cross sections.
- Published
- 2021
- Full Text
- View/download PDF
45. Cloud Condensation Nuclei (CCN) Activity Analysis of Low-hygroscopicity Aerosols Using the Aerodynamic Aerosol Classifier (AAC)
- Author
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Akua Asa-Awuku and Kanishk Gohil
- Subjects
Electrical mobility ,Materials science ,Differential mobility analyzer ,Cloud condensation nuclei ,Particle ,Hydraulic diameter ,Köhler theory ,Shape factor ,Aerosol ,Computational physics - Abstract
The Aerodynamic Aerosol Classifier (AAC) is a novel instrument that size-selects aerosol particles based on their mechanical mobility. So far, the application of an AAC for Cloud Condensation Nuclei (CCN) activity analysis of aerosols has yet to be explored. Traditionally, a Differential Mobility Analyzer (DMA) is used for aerosol classification in a CCN experimental setup. A DMA classifies particles based on their electrical mobility. Substituting the DMA with an AAC can eliminate multiple charging artifacts as classification using an AAC does not require particle charging. In this work, we describe an AAC-based CCN experimental setup and CCN analysis method. We also discuss and develop equations to quantify the uncertainties associated with aerosol particle sizing. To do so, we extend the AAC transfer function analysis and calculate the measurement uncertainties of the aerodynamic diameter from the resolution of the AAC. The analyses framework has been packaged into a Python-based CCN Analysis Tool (PyCAT 1.0) open-source code, which is available on GitHub for public use. Results show that the AAC size-selects robustly (AAC resolution is 10.1, diffusion losses are minimal and particle transmission is high) at larger aerodynamic diameters (≥∼85 nm). The size-resolved activation ratio is ideally sigmoidal since no charge corrections are required. Moreover, the uncertainties in the critical particle aerodynamic diameter at a given supersaturation canpropagate through droplet activation and the subsequent uncertainties with respect to the single-hygroscopicity parameter (κ) are reported. For a known aerosol such as sucrose, theκderived from the critical dry aerodynamic diameter can be up to ∼50 % different from the theoretical κ. In this work, we do additional measurements to obtain dynamic shape factor information and convert the sucrose aerodynamic to volume equivalent diameter. The volume equivalent diameter applied to κ- Köhler theory improves the agreement between measured and theoretical κ. Given the limitations of the coupled AAC-CCN experimental setup, this setup is best used for low hygroscopicity aerosol (κ ≤ 0.2) CCN measurements.
- Published
- 2021
46. An overview of aerosol particle sensors for size distribution measurement
- Author
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Panich Intra
- Subjects
aerosol ,electrical mobility ,nanoparticles ,size distribution ,spectrometer ,Technology ,Technology (General) ,T1-995 ,Science ,Science (General) ,Q1-390 - Abstract
Fine aerosols are generally referred to airborne particles of diameter in submicron or nanometer size range. Measurement capabilities are required to gain understanding of these particle dynamics. One of the most important physical and chemical parameters is the particle size distribution. The aim of this article is to give an overview of recent development of already existing sensors for particle size distribution measurement based on electrical mobility determination. Available instruments for particle size measurement include a scanning mobility particle sizer (SMPS), an electrical aerosol spectrometer (EAS), an engine exhaust particle sizer (EEPS), a bipolar charge aerosol classifier (BCAC), a fast aerosol spectrometer (FAS) a differential mobility spectrometer (DMS), and a CMU electrical mobility spectrometer (EMS). The operating principles, as well as detailed physical characteristics of these instruments and their main components consisting of a particle charger, a mobility classifier, and a signal detector, are described. Typical measurements of aerosol from various sources by these instruments compared with an electrical low pressure impactor (ELPI) are also presented.
- Published
- 2007
47. Uniform Cs2SnI6 Thin Films for Lead-Free and Stable Perovskite Optoelectronics via Hybrid Deposition Approaches
- Author
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Lee, Byungho, Shin, Byungha, and Park, Byungwoo
- Published
- 2019
- Full Text
- View/download PDF
48. Improvement of Engine Exhaust Particle Sizer (EEPS) size distribution measurement – II. Engine exhaust particles.
- Author
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Wang, Xiaoliang, Grose, Melissa A., Caldow, Robert, Osmondson, Brian L., Swanson, Jacob J., Chow, Judith C., Watson, John G., Kittelson, David B., Li, Yang, Xue, Jian, Jung, Heejung, and Hu, Shaohua
- Subjects
- *
PARTICLE size distribution , *DIESEL motor exhaust gas , *ELECTROMETERS , *CARBONACEOUS aerosols , *PARTICLE size determination , *MONODISPERSE colloids - Abstract
Particle size distributions measured by the Engine Exhaust Particle Sizer Spectrometer (EEPS) have been reported to disagree with those by scanning mobility particle sizers (SMPS). The discrepancies are larger for the accumulation mode engine exhaust particles than for compact-shape particles. Engine exhaust particles, specifically carbonaceous aggregates, have different charging characteristics compared to nearly spherical particles because aggregates acquire more charges at a given mobility diameter in a unipolar charging environment. Therefore, different instrument matrices, that represent the relationship between particle size and EEPS electrometer current distributions, are needed for compact-shape particles and aggregates. This paper reports on a study to improve the EEPS performance for engine exhaust measurements. The EEPS was calibrated with monodisperse particles from the exhaust of a diesel engine. The geometric mean diameters measured by the EEPS using the original instrument matrix agreed with SMPS within 15% for particles <50 nm (that were mostly spherical), but underestimated by 20–50% for larger particles (that were mostly aggregates). A new EEPS instrument matrix was developed for fresh engine exhaust, and its performance was evaluated using a diesel engine, two passenger cars with gasoline direct injection (GDI) engines, one vehicle with a turbo direct injection (TDI) diesel engine, and a diesel generator. The geometric mean diameters by the EEPS new matrix agreed with SMPS within 14% for monodisperse engine exhaust particles<50 nm while larger particles agreed within −19% to 1%. The new matrix also improved the agreement between EEPS and SMPS for polydisperse exhaust particles from different engines under different operating conditions. Diesel engine tests showed that the total concentration, geometric mean diameter, and geometric standard deviation by the SMPS and EEPS with the new matrix differed less than 16%, 33%, and 9%, respectively, with the greatest differences found for particles <15 nm. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
49. Improvement of Engine Exhaust Particle Sizer (EEPS) size distribution measurement – I. Algorithm and applications to compact-shape particles.
- Author
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Wang, Xiaoliang, Grose, Melissa A., Avenido, Aaron, Stolzenburg, Mark R., Caldow, Robert, Osmondson, Brian L., Chow, Judith C., and Watson, John G.
- Subjects
- *
PARTICLE size distribution , *ALGORITHMS , *COMPARATIVE studies , *MATHEMATICAL models , *DIESEL motor exhaust gas , *GEOMETRIC analysis - Abstract
Comparisons between the Engine Exhaust Particle Sizer Spectrometer (EEPS) and scanning mobility particle sizers (SMPS) have shown that the EEPS underestimates size and concentration of particles >~75 nm and that the discrepancies vary by particle type. This paper describes the development of a new EEPS instrument matrix to improve size distribution measurements for compact-shape particles. Both the operating principle and the mathematical model of the EEPS data inversion are described. Monodisperse and polydisperse sucrose, poly-α-olefin oil (PAO), and sodium chloride (NaCl) particles were used for calibration. A new instrument matrix was developed and implemented for data inversion. This study confirms the literature findings that the geometric mean diameter, geometric standard deviation, and total number concentration by EEPS with the default instrument matrix (referred to as IM-2004) agrees with SMPS within ±20% for compact-shape particles <~75 nm. However, EEPS with IM-2004 underestimates geometric mean diameters by 20–40% for larger particles. The revised instrument matrix improves the size agreement with the SMPS to within ±14% across the entire size range. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
50. A spectrometer for measuring particle size distributions in the range of 3 nm to 10 μm.
- Author
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Liu, Jieqiong, Jiang, Jingkun, Zhang, Qiang, Deng, Jianguo, and Hao, Jiming
- Abstract
A spectrometer combining electrical mobility sizing and aerodynamic sizing was developed to measure aerosol size distributions in the range of 3 nm to 10 μm. It includes three instruments which cover different size ranges (a nano scanning mobility particle sizer (NSMPS, 3-60 nm), a regular scanning mobility particle sizer (RSMPS, 40-700 nm), and an aerodynamic particle sizer (APS, 550 nm-10 μm)). High voltage and sheath flow of the NSMPS and RSMPS were supplied using two home-built control boxes. A LabVIEW program was developed for spectrometer automatic operation. A linear inversion method was applied to correct particle multiple charging effects and to integrate data from the three instruments into a wide-range size distribution. Experiments were conducted to compare distributions in the overlap size ranges measured by three instruments. Good agreement between the NSMPS and RSMPS was achieved after correcting for the difference in counting efficiencies of the two particle counters. Aerodynamic size distributions reported by the APS were converted to mobility size distributions by applying an effective density method. Distributions measured by the RSMPS and APS were consistent in the overlap size range of 550-700 nm. A full spectrum in the size range of 3 nm to 10 μm was demonstrated by measuring aerosol generated using a mixture of different sized polystyrene latex spheres. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
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