Search

In the current situation, the rapid growth of the infrastructure causes a shortage of suitable construction sites. Engineers are therefore compelled to use soft deposits on ground that has a poor bearing capacity and a high compressibility. As a result, before starting development on such deposits, the ground needs to be improved. One of the efficient solutions to these problems is consolidation with vertical drain. The purpose of the current study is to preload with pre-fabricated vertical drains in order to reclaim the soft ground. The undisturbed samples taken from the borehole are put through a laboratory consolidation test with various load increments in order to construct the preloading scheme using PVDs. During the test, readings for the time-settlement were also taken. The compression index of the clay and the vertical and horizontal consolidation co-efficients, which are 0.9, 1.5 m2/year and 3 m2/year, respectively, are determined by analysing the results of the consolidation tests. The marine clay's total primary consolidation settling is estimated to be 1.182 m (1,182 mm). The preloading suggested is 90kN/m2 to achieve 95% consolidation prior to construction. [ABSTRACT FROM AUTHOR]

COVID-19 patients suffer from stress and health problems because of corona virus the characteristics of their work and their contact with patients and others. Because stress can affect emotion, it's possible that pressure explains why people react differently to mental health issues. The main goal of this survey is to learn about COVID-19 patients' perceived stress and health. In order to achieve this goal, a representative questionnaire-based survey was launched in and around Chennai with a sample of 400 COVI-19 patients. Using statistical methods, some interesting results were discovered. Perceived stress is confirmed among corona virus patients in and around Chennai, according to the findings. Finally, the findings and outcomes of this study might be useful for administration in the social contact between COVI-19 patients and their family, friends, and coworkers. [ABSTRACT FROM AUTHOR]

Silver quantum dots are synthesized from aqueous AgNO3 solution by employing biological reduction using Tamarindus indica leaf extract in different compositions. The prepared quantum dots were analyzed experimentally by employing UV-visible Spectroscopy, HRTEM, and FTIR techniques. UV-vis experimental data was employed to calculate the optical band gap of different samples. Effective engineering of optical band gap and nanostructure is achieved by the method of green synthesis. HRTEM analysis indicated the formation of quantum dots with particles of spherical shape with an average size of 10 nm. FTIR measurements were carried out to identify the possible biomolecules responsible for capping and efficient stabilization of the Ag metal nanoparticles in the present study. [ABSTRACT FROM AUTHOR]

This paper aims to review the tools and methods used to enhance ergonomics in the construction industry (CI) using bibliometric and systematic literature analysis. For this purpose, the bibliometric information from the research article published on ergonomics in the field of CI was extracted from the databases of Scopus. A total of 3,052 articles published between 1997 and 2021 were retrieved. Information collected was analyzed using bibliometric and systematic analysis of literature using open-source computer software. The main findings of the study show the publication trends related to ergonomics in CI since 1997 and identify the most productive authors and the most influential research work. Our findings show that Peter Hancock and Waldemar Karwowski are the leading authors in the field of ergonomics in CI, the most influential articles have been published in journals such as the State of Science: Mental Workload in Ergonomics, Human Factors, and Ergonomics in Production Planning, A Review of Enterprise Agility: Concepts, Frameworks and Attributes, and Human Factors and Ergonomics. Systematic literature analysis of these articles has shown the impact of this topic on the research society and among academics. The findings of our research have theoretical and practical implications for CI ergonomics. The scope for future work has been identified which will be of use to emerging researchers in the field of ergonomics. [ABSTRACT FROM AUTHOR]

Nanocrystalline Pr2MoO6, a promising material for numerous optical applications, has been synthesized by modified combustion technique. Structural analysis of the sample was performed by powder X-ray diffraction (XRD). The XRD analysis revealed that the as prepared sample has single phase with tetragonal structure. XRD studies indicates that the complex ceramic perovskite phase is formed during the combustion process itself without the need of any post calcination process. The obtained lattice parameters are a=b-= 5.610 and c=11.843Å which is well agreeing with JCPDS file. The crystalline size calculated from XRD by using Scherrer formula was 26 nm. The particle size estimated from transmission electron microscopy was in the range 24-28nm. The optical properties of the sample were studied using ultraviolet UV-Visible absorption spectroscopy, which showed that the sample showed maximum absorption in ultraviolet region trailing towards violet region of visible region. The material band gap increases from 2.72eV to 3.01eV on annealing. The photoluminescence spectra showed intense emission in the blue region and a medium intense peak in the red region. Pr2MoO6 finds applications in the field of phosphors for LED, as laser host materials and in solid state lasers besides the normal optical and luminescent applications. [ABSTRACT FROM AUTHOR]

TiO2 thin film nanostructures are prepared using pulsed laser deposition technique in reactive atmosphere. The obtained thin films are annealed at different temperatures to attain crystalline modifications. Optical properties of these quantum well nanostructures are studied using UV-visible spectroscopic analysis. Phase determination and structural analysis of the structures are conducted using GIXRD and micro Raman analysis. Morphological studies are conducted in detail, using SEM and AFM techniques. Effects of various growth parameters including different deposition and post deposition parameters are investigated. Well ordered, transparent TiO2 quantum wells are developed. [ABSTRACT FROM AUTHOR]

There are published articles dealt with the integration of acceptance sampling and supply chain management using simulation models. This paper focus on developing simulation model for 100 % screening in supply chain management and considers supply chain model with the re-ordering system. Whatever be the good items produced, practically there are the possibilities of imperfect items or they might not satisfy the standards of production process. Therefore, it needs rectification. Hence, the researcher applies sampling plans in-between the stage of purchase and production process. Generally, after purchase, the entire lot is being sent to the production process, whereas, in this proposed model, the purchased lot is being sent to sampling inspection. In this stage, if the sampling inspection results are positive and the lot is accepted then only the lot is send it to production process. If the lot is rejected then it is allowed to the acceptance sampling process only after 100% screening. Under 100% Screening Policy the simulation model considers the cost effectiveness in supply chain also using the simulation software Goldsim 12.0. [ABSTRACT FROM AUTHOR]

Composite materials have variety of new potential usage in various technological areas such as aerospace, automobile, energy, medicine, and chemical industry. In this work, 0, 1, 3, and 5 weight percentages of TiO2 particles were incorporated into the 6063 aluminum alloy by using the liquid metallurgy techniques with ultrasonic vibrator. Scanning Electron Microscopy (SEM) was used to analyze the even dispersion or distribution of elements in composites. Characterization of mechanical properties confirms the particles added increases the hardness of the composites due to nano sized particles. The highest tensile stress was obtained by 5 wt. % of TiO2 particles. It was exposed that the presence of TiO2 reinforcement led to significant enhancement of strength of the material without sacrificing AA6063 ductility. The wear rate enhance with rising to in load and dependent upon TiO2 occurrence in the AA6063. With the composites tested and the AA6063- 5 wt. % TiO2 exhibited superior wear resistance. [ABSTRACT FROM AUTHOR]

In the present study, the effects of water emulsion and CH3NO2 (nitromethane) additive on the combustion performance and emission characteristics using biodiesel blends are investigated on single cylinder diesel engine. The emulsification technique is used to reduce the oxides of nitrogen emission. Biodiesel is produced from cotton seed, neem oil and blended with mineral diesel to form different blend compositions with Nitromethane as an additive. Blends 10, 20, 30, 40 and 100% diesel are the blending proportion. The experiment was undergone in single-cylinder diesel engine coupled with an exhaust gas analyzer. For making emulsion, surfactant blends were screened for their effectiveness in stabilizing water in biodiesel emulsion system. The Biodiesel was mixed with water in different the ratios to investigate the stability & characteristic of fuel. Effective results were obtained with blend of SPAN 80/TWEEN 80. A high-speed mixing homogenizer technique was used to obtain the resultant water in biodiesel emulsion containing blend of SPAN 80/TWEEN 80. Effective results were foreseen on the combination of B20 proportion with CH3NO2 blend in specific fuel consumption and envisioned amount of reduced emission behaviour was observed. [ABSTRACT FROM AUTHOR]

Thermionic emission and tunnelling currents at the abrupt hyper nodes are investigated. The energy and quasiimpuls conservation laws are applied and the domains of integration for the current density calculation are found. It is found that different effective masses at the heterojunction affect dominantly the tunnelling current. [ABSTRACT FROM AUTHOR]

Internet of Things is recent emerging technology in Information Communication Technology. Lots of application nowadays uses this IoT concepts in every filed. Many research challenges also there in this field. One such most powerful application is smart Home Automation System. This paper describes the overall design and development of an individual system that incorporates a significant lowcost and flexible home controls and monitoring system for accessing and controlling house hold appliances automatically by implementing geofence technology. Remotely, the system uses the GPS location of the user through the website which can be accessed from phone and computer. Application to automatically trigger the pre-determined commands makes the smart home more secure and reduces its dependence on the human touch. [ABSTRACT FROM AUTHOR]

Bulk nanocomposite magnets based on the Nd-Fe-B/α-Fe system were fabricated using mechanical alloying and shock compaction. A high energy ball mill was used to combine Magnaquench MQA-T type Nd-Fe-B powder with varying amounts of pure Fe powder. The mechanically milled powders were shock compacted to near full density at a primary shock pressure of approximately 6.3 GPa. A range of heat treatments were applied to the recovered samples, and the crystallization behavior and magnetic properties were measured. The presence of additional iron increases magnetization saturation, but decreases coercivity. Heat treatment at 550oC increases the coercivity only marginally, which can be attributed to the amorphous material crystallizing to the α-Fe phase instead of the Nd2Fe14B phase. A subsequent shock experiment at 8.3 GPa produced a tetragonal to BCC phase transition in the Nd-Fe-B powder. [ABSTRACT FROM AUTHOR]

We examine the possibility of determining the neutrino mass hierarchy in the limit θ13 = 0 using atmospheric neutrinos as the source. In this limit, θ13 driven matter effects are absent so independent measurements of Δ31 and Δ32 can, in principle, lead to hierarchy determination. Since their difference is Δ21, one needs an experimental arrangement where Δ21L/E>=1 can be achieved. This can be satisfied by atmospheric neutrinos which have a large range of L and E. Still, we find that hierarchy determination in the θ13 = 0 limit with atmospheric neutrinos is not a realistic possibility, even in conjunction with a beam experiment like T2K or NOνA. We discuss why, and also reiterate the general conditions for hierarchy determination if θ13 = 0. [ABSTRACT FROM AUTHOR]

A systematic study of electronic, and thermal properties such as the Density of states, Fermi energy, Debye temperature and specific heat coefficient, has been carried out using the results of electronic bandstructure and related characteristics of the Laves phase compound, TiFe2. Computation of electronic bandstructure and associated properties has been carried out using the tight-binding-linear-muffin-tin-orbital (TB-LMTO) method within atomic sphere approximation (ASA). The calculated values are compared with the available results of literature. [ABSTRACT FROM AUTHOR]

Self consistent first principle calculations on superconducting material Mo3Ir of A15 phase have been performed to understand their fundamental characteristics of the structural, electronic and thermal properties. The bulk modulus (B0), Debye temperature (θD), density of states (N (EF)) and electronic specific heat coefficient (γ) have been computed in terms of the electronic structure results obtained by using the tight-binding linear muffin tin orbital (TB-LMTO) method based on the density functional theory (DFT) within the local density approximation (LDA). Structural, electronic and thermal properties calculated here are found to corroborate well with the experimental and theoretical results of literature. [ABSTRACT FROM AUTHOR]

Optically good quality L-arginine semi-oxalate, an organic nonlinear optical crystal, has been synthesized from aqueous solution by slow evaporation method. Single crystal X-ray diffraction (XRD) analysis reveals that the synthesized L-arginine semi-oxalate crystal possesses triclinic structure with unit cell dimensions as a=5.05Å, b=9.73Å, c=13.12Å, α=111.030, β=92.790 and γ=91.910. The Fourier transform infra-red (FTIR) spectroscopy was analyzed and the presence of functional groups of L-arginine semi-oxalate was confirmed. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) studies show that the material is thermally stable up to 1460C and the melting point is 1500C. Kurtz and Perry powder technique confirms that the second harmonic generation (SHG) efficiency is 0.32 times that of standard organic materials urea and KDP. [ABSTRACT FROM AUTHOR]

The low-temperature behavior of conductivity relaxation of disordered N-doped 6H-SiC is investigated. This work presents the effect of swift heavy ion (SHI) irradiation on 6H-SiC studied using impedance spectroscopy (IS). SHI irradiation was done with the fluences 8 × 1012 and 2 × 1013 ions/cm2 at 300 K. The observed changes in the Modulus spectra depict the disorder induced due to high energy loss of Ag12+ ions in 6H-SiC. The results indicate that the relaxation times were affected by the free charge carriers trapped at the electrically active defect states. [ABSTRACT FROM AUTHOR]