Search

Understanding the acoustic properties is crucial when building a novel material system. There has been an increasing need for improvements to aviation, railroads, and automobile interior noise over the previous two decades. Interior noise is harmful to people's health and lowers passenger comfort. The use of sound-absorbing material is one of the most effective noise-control measures. The most prevalent industrial sound absorption and insulating materials are mineral fibres, composites, and foam. Sandwich Structure has a greater cost-cutting and weight-saving property. Bio-sandwiches are utilised in aeroplanes, trains, and vehicles because of their increased strength and lower density. Researchers conducted numerous tests to better understand the acoustic performance of laboratory scale specimens. During their research, the researchers tested and reported on the high and low frequency acoustic properties of natural fibre. Even though there is more to analyse in the literature, categorization is necessary in order to move forward with more research on this topic. Experiments, data collection, presentation of results, data correlation, and interpretation are all instances of obstacles. The current review was also called into question in order to have a better knowledge of the acoustical qualities. [ABSTRACT FROM AUTHOR]

This research paper outlines a thorough methodology for a productive database management system for blood banks and incorporating with next-gen technologies such as cloud, CRM and automating workflow and receiving response through IOT devices such as ALEXA. The database is the most practical place for caching data, and it is the best tool for creating, maintaining, updating, and data from many perspectives. A well-organized blood bank database offers countless advantages, including increased productivity and time savings. In an effort to close this gap, we have Modelled a well –organized database. Additionally, we have created a tool that serves as a reminder. The main cloud services offered by Amazon, including IAM, S3, DYNAMODB, EC2, LAMBDA, API, and Cloud Watch, will be used in this project. IAM (the IAM service is used for authentication and security), S3 (it is a scalable cloud storage bucket that aids in storing the data received in the end server), DYNAMODB (is used as a database service), EC2 (used for implementing Linux instances), API (application programme interface), and CLOUD WATCH are some examples of other services that are used (it used for viewing the history logs). Additionally to automate workflow/process through voice command or get specific details, In this project let's consider if we want to get any information regarding the donor details, blood group details, it can be received as a voice output through our digital IOT device/personal assistant such as Alexa. [ABSTRACT FROM AUTHOR]

We report the development of a proton conducting polymer electrolyte using Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and Cellulose acetate propionate (CAP). A blend polymer membrane is made with PVDF-HFP and CAP with the ratio 50:50. By adding different weight ratio of ammonium thiocyanate (ATC) to the blend polymer, a proton conducting polymer electrolyte was prepared. Dielectric study and temperature dependence ionic conductivity study are done by electrochemical impedance spectroscopy. Ionic conductivity is found to increase with the increase in the dopant concentration. A proton battery is constructed and its performance is studied. [ABSTRACT FROM AUTHOR]

Cryogenic forming has significant potential as a novel method for fabricating aluminum alloys, because to its improved formability. Cryogenic deformation of alloys has interesting mechanical properties, but further study is needed to fully understand them. Here, the flow performance and underlying distortion mechanism of AA5052 at cryogenic conditions were extensively analyzed. To develop and modify a constitutive model, uniaxial tensile tests were conducted between 115-299 K at strain rates of 0.00030 to 0.02 s-1. The Erichsen cupping index (IE) values were then analyzed throughout a wide temperature range (299 K, 205 K, and 115 K). A smooth stress-strain curve was achieved below 205 K because dynamic strain aging was suppressed, in contrast to the serrated curve reported between 205 K and 299 K. The alloy's elongation and IE value were approximately 53% and 21% larger, respectively, at 115 K compared to those obtained at 299 K. This was because to the elevated critical dislocation density and persistent deformation that occur at extremely low temperatures. The 31% increase in tensile strength at 115 K is due to cryogenic deformation under high dislocation density. [ABSTRACT FROM AUTHOR]

The effect of reinforcement of multi walled carbon nanotubes (MWCNT) into poly (vinylidene fluoride) (PVDF) is studied to improve thermal, electrical and dielectric properties. The differential scanning calorimetry determined the melting temperature (159.67 °C) and crystallization temperature (136.19 °C) of polymer composite. The composite of 4% CNT blend (473.53 °C) has higher degradation temperature than pure PVDF (472.81 °C) as observed in thermogravimetric analysis. Fourier transform infrared spectroscopy peak observed at 1401cm-1 signifies CH3 and CH2 deformation stretching vibration. The breakdown strength of polymer composites reduced with addition of CNT fillers to polymer matrix. At high frequencies, the dielectric constant of PVDF increases from 2.9 to 5.5 with addition of MWCNT by 2% and to 8.5 with addition of MWCNT. [ABSTRACT FROM AUTHOR]

Citric acid assisted barium titanate (CABT) nanostructured materials are prepared by facile hydrothermal route. The synthesized CABT samples are subjected to various characterization analyses such as XRD, SEM, TEM, UV, RTPL and dielectric studies. Powder XRD analysis revealed a single crystalline perovskite cubic crystal structure in the CABT sample. The elongated spherical-like morphology of the CABT sample was revealed by SEM and TEM analysis. CABT sample's band gap energy is estimated by the UV absorption analysis. RTPL emission studies showed the luminescence behavior of the nanostructured CABT sample. CABT sample has a low dielectric constant (εr) value at high frequencies, indicating improved optical quality with lesser defects. [ABSTRACT FROM AUTHOR]

A Multi-layered composite cylindrical shell made up of homogeneous isotropic piezoelectric and pyroelectric layer is considered for harmonic wave propagation and axisymmetric vibration respectively. The linear constitutive equations are developed based on coupled mechanical field, thermal field and electrical field. Six-noded isoparametric shape functions are used to model the shell structure. Frequency equations are derived for the thermally induced and traction free surfaces with continuity conditions using Galerkin approach. The damped frequencies are obtained in complex form (a+ib) for the different layer combinations like B/F/B and F/B/F under axisymmetric modes using Mat lab software. The numerical results are carried out for Barium Titanate (B) and Cobalt Ferrite (F) in the form of data. The dispersion curves are drawn for different modes in different stacking sequences. The accuracy and convergence are obtained by increasing the number of mesh elements in finite element analysis (FEM) are discussed. [ABSTRACT FROM AUTHOR]

The poly (vinylidene fluoride) (PVDF) reinforced with multi wall carbon nanotubes (MWCNT) polymer composites is studied to improve thermal and mechanical properties. The composite of 4% CNT blend (473.53 °C) shows higher degradation temperature when compared to the pure PVDF (472.81 °C) from thermo gravimetric analysis. The addition of 2% CNT into PVDF provides tensile strength larger than 30MPa. The Young's modulus larger than 900 MPa was obtained for dispersion of 4% CNT in PVDF polymer. The XRD patterns presented that the characteristic peaks of PVDF are preserved in the case of the pure form as well as in MWCNTs filled composite form. Scanning electron images shows agglomeration and presence of good dispersion at higher magnification. [ABSTRACT FROM AUTHOR]

This article investigates the pulsating unsteady heat and mass transfer of MHD Casson nanofluid with radiation and slip boundary conditions past a porous channel. The solution of the nonlinear ODE obtained from the governing equations by utilizing a similarity transformation is derived by the perturbation technique. The results are portrayed in figures, and the consequence of various parameters such as Casson parameter, Reynolds number, slip parameter and radiation parameter on heat and flow transformation are observed. [ABSTRACT FROM AUTHOR]

This Project is intended for vertical horticultural purposes. It is intended to limit the work of ranchers furthermore to speeding up and precision of the work. Today the natural impact of rural creation is very much engaged and accordingly the requests to the business are expanding. In the current situation, by far most of the metropolitan regions in India don't have satisfactory gifted work in cultivating region which impacts the progression of farming country. In this manner ranchers need to utilize redesigned innovation for development movement (burrowing, seed planting etc.). Seed planting Machine which grew hitherto are worked physically or there is no Smartness of work done by it expects seed planting. Manual technique incorporates broadcasting the seeds by hand. This Project is made by utilizing Arduino UNO, LCD Board, PH Sensor, DC Gear Motor for seed planting, Water Pump Motor, Four Relay Board, Robotic Vehicle Full Set. At times technique for drilling for example making openings and dropping seeds by hand is utilized. Additionally, a couple of bullocks is utilized to hold the substantial gear of evening out and seed dropping. Hence, it's an optimal chance to automate the region to beat this issue. There is a need to focus on updating agrarian equipment [ABSTRACT FROM AUTHOR]

In this present study, La1-xYxO3 nanoparticles were synthesized by the sonochemical method and calcinated at 500°C. The phase composition of the nanoparticles depends on the value of x. The effect of structural, morphological, and optical properties of the pure lanthanum oxide nanoparticles (La2O3 NPs) and Yttrium(Y) doped lanthanum oxide nanoparticles (Y: La2O3 NPs) was investigated through several characterization techniques. Powder X-ray diffraction (XRD) technique was used to examine the nanoparticles structural property and results revealed a pure hexagonal phase without any other impurities. The morphology of the yttrium doped lanthanum oxide samples was evaluated by scanning electron microscope (SEM). The optical band gap of prepared nanoparticle samples was examined from the observed wavelength using ultraviolet-visible spectroscopy (UV-Vis). The vibrational properties of the bonds are analyzed using Fourier transform infrared spectroscopy (FTIR) and results exposing the presence of a functional group. EIS was used to study the electrical conductivity of the nanoparticles. The presented effort confirms that the prepared nanoparticles may be suitable for fabricating efficient dielectric and gas sensor applications. [ABSTRACT FROM AUTHOR]

Increase in construction activities leads to innovation of many new building materials as there is scarcity of available resources. Continuous researches are undergoing in various parts of the world to find new building materials in concrete. One such waste used in such research is non-biodegradable wastes, mainly plastics. This study presents the various research works conducted to use non-biodegradable waste materials as a building material. Various forms of wastes and the tests conducted to use the same as a construction entity is studied. [ABSTRACT FROM AUTHOR]

Over the last two decades, proton conducting polymer electrolytes have received a great deal of attention because of their potential large-scale application in electrochemical devices. Various proton conducting polymer electrolytes with ammonium salts as dopants have been reported. But, literature survey reveals that proton conducting polymer electrolyte based on PVA doped with arginine and ammonium thiocyanate is scarce. An attempt has been taken to prepare proton conducting polymer electrolytes based on poly vinyl alcohol doped with arginine and different molecular weight of ammonium thiocyanate that have been prepared by solution casting technique using distilled water as solvent. The amphorous natures of polymer electrolytes have been confirmed by XRD analysis. The FTIR analysis confirms the complex formation between the PVA, arginine and ammonium thiocyanate. From the AC impedance studies, the maximum ionic conductivity has been obtained to be 2.3x10-4 Scm-1 for 75Mwt% PVA :25Mwt% Arginine:50Mwt%NH4SCN polymeric system at room temperature. [ABSTRACT FROM AUTHOR]

Room temperature curing of the polyester composites is time consuming and inferior in terms of the strength compared to the composites cured with the temperature. Hence, in this work, a range of the curing temperatures were employed and its influence on the tensile, impact and free vibration properties of the sisal/polyester composite. Composites are produced for the varying curing temperature ranges from 60°C to 100 °C in steps of 10 with hot compression molding process. Results indicate that the highest mechanical strength was recorded for the samples cured at 100° C. The free vibration properties such as natural frequency and damping factor were obtained from the impulse excitation technique. Both natural frequency and damping of the composites was found to vary with the changes in curing temperature. [ABSTRACT FROM AUTHOR]

Tribological behaviour of the Poly lactic acid (PLA) and copper (I) oxide (Cu2O) composite under two different temperature were studied using the pin on disk tribometer under dry sliding condition. Comparative wear studies of the unreinforced PLA and PLA/Cu2O-10 volume percentage composite is made under the low sliding velocity (1 m/s) for the distance of 2000m at room temperature (35°C) and elevated temperature (65°C) under low loading condition (10 N). The worn-out samples were examined using the optical microscope. The wear trend were analysed in the plain PLA and the blend of PLA/ Cu2O compressed composite. The study showed differing trends of wear at different temperatures. [ABSTRACT FROM AUTHOR]

We have prepared BaFe12O19/polyvinylidene fluoride composites and studied their dielectric permittivity of over a wide range of frequency. We have observed a large enhancement of effective dielectric permittivity ∼ 23@1KHz for 0.55% volume fraction of BaFe12O19 filler. The effective enhancement of dielectric permittivity with volume fraction follows the Yamada model. Additionally, these composites show the good thermal stability over a wide range of temperature. [ABSTRACT FROM AUTHOR]