Digital Eprints Services at Vignan's Foundation for Science, Technology & Research
Not a member yet
721 research outputs found
Sort by
A computational investigation of the influence of acceptor moieties on photovoltaic performances and adsorption onto the TiO2 surface in triphenylamine-based dyes for DSSC application
No full textAn Optimization Strategy To Reduce Surface Roughness, Flank Wear And Tool Vibration In Micro Milling Of TI-6AL-4V Alloy
No full textThe present work is aimed to investigate the influence of process parameters namely cutting speed, feed and uncut chip thickness on tool life in micro milling of Ti�6Al-4V alloy. Twenty Seven experiments have been planned as per full factorial
design with three levels of each parameter using carbide end mill cutters. Surface roughness and vibration amplitude are considered as responses to evaluate the tool life and to identify significance of input process parameters. In this study, a non�contact sensor, Laser Doppler Vibrometer (LDV) was used to measure the vibration of tool in terms of Acousto Optic Emission (AOE) signals. A high-speed Fast Fourier Transform (FFT) analyser was used to transform the acousto optic emission signals in to useful signals like vibration amplitude. In the analysis of surface roughness and amplitude of vibration, optimum cutting parameters were found as 5000 r.p.m. of
spindle speed, 40 mm/min of feed rate and 25.6 µm of uncut chip thickness
In silico design of multiepitope vaccine candidate against SARS CoV and CoV2
Get PDFSARS-CoV-2 infection became pandemic and public concern due to the outbreak of COVID-19. Since its appearance in Wuhan,
China in December 2019 the infection spread across continents. Substantial numbers of global population were disrupted both in their health and family structure. The spike protein is found to be the key protein of coronavirus as it anchors to human alveolar epi-thelial cells. Hence, the present study is focused on immune informatics analysis of spike glycoprotein (S-protein) of SARS-CoV-2 to explore MHC binding potential of its epitopes. Out of 5058 peptides, each with nine residues obtained through NetMHCpan version 4.1b, six peptides were predicted as epitopes with strong binding potential to HLA-A*02:01, whose distribution is ~33.8% among Indian Asians. Among these six peptides, the amino acid sequence starting from 417th position namely KIADYNYKL was found to be highly probable antigen with a value of 1.6639 derived through VaxiJen V2.0. Peptides predicted in the receptor binding region also revealed that the aforementioned peptide ranked as the strong binder to HLA-A*02:01. The secondary structure prediction of RBD performed through Phyre2 revealed that these peptide residues spanned to stretch in beta strand followed by random coil and reported as immunodominant region using Immunome Browser tool. This study would pave the path to understand the prevalent
Delta Plus variant of CoV2 (K417N) and facilitates to design a recombinant vaccine
Image analysis to quantify the browning in fresh cut tender jackfruit slices.
Get PDFChanges in physicochemical properties of fresh cut tender jackfruit during storage is depend on its colour. Colorimeter measurements are best for the samples with homogeneous colour. However, for samples with non-homogenous colors or large sizes (like fruits and vegetables), the colorimeters are inappropriate and inaccurate. The aim for this study is to quantify the amount of browning in fresh cut tender jackfruit slices by using image analysis technique and justify the results by comparing them with existing techniques like sensory examination, enzyme activity, and colorimeter. It can be concluded from the results that browning in fresh cut tender jackfruit slices increase rapidly in control and normally packed samples. Correlation coefficient as high as 0.963, represent that image analysis system is an accurate and highly consistent method to quantify the colour of fruits and vegetables
Air Jet Erosion Studies on Mg/SiC Composite
No full textMagnesium with 10% SiC is identified to be a suitable composition for wear resistance application. To improve the utilization of this composite for various industrial applications, erosion study has been conducted by using air jet erosion tester with varied machining conditions. The composite is prepared by a conventional stir casting process. Alumina is taken as an erodent particle. Impact angle, erosion velocity, and discharge rate are taken as the governing parameters of erosion rate. Lower impact angle and high erodent velocity yield to have a high erosion rate of 0.022 g/min with the least surface finish of 1.48 μm. Erosion velocity is found to have a significant
effect of 59% over the other considered parameters. Further, the analysis of the surface profile parameters likely; Ssk, Sku, Sp, Sv, and Sa on the machined surface reveals the mechanism of the material removal and also, the surface defects are analyzed by using SEM image
Fabrication and property evaluation of Al 6061+x% (RHA+TiC) hybrid metal matrix composite
No full textThe present work aims in understanding the mechanical properties and strengthening behavior of Al 6061 based particulate hybrid aluminium matrix composites (PHAMCs) reinforced with rice husk ash (RHA) and TiC particles (sizes;
10 µm) fabricated by liquid metallurgical route. RHA+TiC particles (3 wt%, 5 wt%, 7 wt%, and 9 wt%) are added in equal
proposition in the hybrid composite which is fabricated through stir-casting technique. Samples are named as S1, S2,
S3, S4 based on the proposition of RHA and TiC, whereas Al 6061 alloy is casted and named as S0. Fabricated composites
were homogenized at 400 °C for 1 h and then aged to 115 °C for 24 h. X-ray difraction result confrms the presence of
principle elements like Al, TiC, Si and oxygen without the formation of any intermetallic elements. Property of PHAMCs
such as ultimate tensile strength, yield strength, and micro Vickers hardness had improved by 31%, 17.1%, and 18%,
respectively with increase in the percentage of reinforcement. Addition of reinforcement slightly lowers the mechanical
properties of PHAMCs which is due to agglomerations and porosity. Reinforcement with more than 7% of RHA and TiC
in matrix signifcantly efect the density, impact energy and percentage of elongation to a maximum of 3.88%, 28.52%,
and 29.91%, respectively. Microstructure of the fractured surfaces are analysed through SEM and it is reported
Manipulation of Electronic Devices and Data in Dispensing Pumps
No full textThe sale of fuel through electronics controlled based
Dispensing units in the retail outlets are the source of
manipulation. The stake holders are customers and are directly
affected by the unauthorized manipulation by the petroleum
product selling units. The electronic devices are more prone for
changing the original encrypted data or stored data as a
program. The program stored in this device can be altered
unauthenticated by external device attached to the original
circuit’s boarders. The circuits board is build with the
microcontroller based hardware that controls the outlet pipe by
setting the control signal by the selling unit. This can be alter by
changing the pulse which are used to modulate the information
bits so that cheating the customer by alter the set control bit by
deliver less or more through the dispensing unit. This research
article focus on explore the possibilities to make the encryption
method of control bits more robust than the present simple pulse
modulation techniques
Surface development by reinforcing nano-composites during friction stir processing – a review
No full textPurpose – Friction stir processing (FSP) is overviewed with the process variables, along with the thermal aspect of different metals. Design/methodology/approach – With its inbuilt advantages, FSP is used to reduce the failure in the
structural integrity of the body panels of automobiles, airplanes and lashing rails. FSP has excellent process ability and surface treatability with good corrosion resistance and high strength at elevated temperatures. Process parameters such as rotation speed of the tool, traverse speed, tool tilt angle, groove design, volume fraction and increase in number of tool passes should be considered for generating a processed and defect-free
surface of the workpiece. Findings – FSP process is used for modifying the surface by reinforcement of composites to improve the mechanical properties and results in the ultrafine grain refinement of microstructure. FSP uses the frictional
heat and mechanical deformation for achieving the maximum performance using the low-cost tool; the production time is also very les
Study Of Structural And Mechanical Aspects Of Praseodymium And Europium Doped SrBi2Nb2O9 Ceramics
No full textBismuth Layer Structured Ferroelectrics (BLSFs) have prominent
technological applications as electronic materials. Strontium Bismuth Niobate (SBN) ceramics doped of rare earth elements SrBi2-xRxNb2O9 (R= Pr,Eu and x= 0.0, 0.2) have been synthesized by solid state reaction method between corresponding oxides and carbonate. The prepared ceramic
samples are analysed by X- Ray Diffraction (XRD) technique to conform the formation of single phase layered perovskite. Further, XRD studies at room temperature revealed orthorhombic structure with lattice parameters a= 5.5023 A0, b= 5.5083 A0 and c= 25.0985 A0 for SBN. Scanning Electron
Microscopy (SEM) envisage a slight change in the morphology of the doped samples compared to SBN. Energy Dispersive X-ray Spectroscopy (EDAX) confirm the elements making of the samples being analysed. Fourier Transform Infrared (FTIR) spectra showed a significant shift in the band position for doped samples in comparison with SBN. The density and volume
of the studied ceramic samples has been identified varying with rare earth element doping in SBN. The Vickers hardness of the samples is measured under a load of 500 gram with dwell time of 20 second using vickers hardness teste
Effect of thickness on structure and optical properties of Zn0.9Co0.1Oδ thin films deposited by magnetron sputtering in oxygen gas environment
No full textZn0.9Co0.1Od thin films have been deposited by radio frequency magnetron sputtering onto fused quartz
substrates under oxygen gas environments as a function of film thickness (time duration). The as deposited films show hexagonal wurtzite structure of ZnO with films orientated in (0 0 2) plane perpendicular to base plane, without any secondary phases of CoO in host ZnO matrix. The crystallite (D) values
estimated from XRD plots show increases with film thickness. The microstructural images recorded with field emission scanning electron microscopy (FE-SEM) have dense microstructure with an average grain size varies about 28–43 nm. The elemental composition of thin films were examined by energy dispersive spectroscopy confirms presence of Co in ZnO. The films have optical transmission in the visible region
is about 55–70%, the absorption edge shifts towards low energy range with increase in film thickness. The estimated optical energy band gap of as deposited films shows a decreasing trend as a function of film thickness. The optical energy band gap for all the films are listed is varies about 3.42–2.85 eV respectively.
2019 Elsevier Ltd. All rights reserved