Vaishali Sharma - Academia.edu (original) (raw)

Papers by Vaishali Sharma

International Journal of Hydrogen Energy, 2022

Rapid advances in the field of catalysis require a microscopic understanding of the catalytic mec... more Rapid advances in the field of catalysis require a microscopic understanding of the catalytic mechanisms. However, in recent times, experimental insights in this field have fallen short of expectations. Furthermore, experimental searches of novel catalytic materials are expensive and time-consuming, with no guarantees of success. As a result, density functional theory (DFT) can be quite advantageous in advancing this field because of the microscopic insights it provides and thus can guide experimental searches of novel catalysts. Several recent works have demonstrated that low-dimensional materials can be very efficient catalysts. Graphene quantum dots (GQDs) have gained much attention in past years due to their unique properties like low toxicity, chemical inertness, biocompatibility, crystallinity, etc. These properties of GQDs which are due to quantum confinement and edge effects facilitate their applications in various fields like sensing, photoelectronics, catalysis, and many more. Furthermore, the properties of GQDs can be enhanced by doping and functionalization. In order to understand the effects of functionalization by oxygen and boron based groups on the catalytic properties relevant to the hydrogen-evolution reaction (HER), we perform a systematic study of GQDs functionalized with the oxygen (O), borinic acid (BC 2 O), and boronic acid (BCO 2). All calculations that included geometry optimization, electronic and adsorption mechanism, were carried out using the Gaussian16 package, employing the hybrid functional B3LYP, and the basis set 6-31G(d,p). With the variation in functionalization groups in GQDs, we observe significant changes in their electronic properties. The adsorption energy E ads of hydrogen over O-GQD, BC 2 O-GQD, and BCO 2-GQD is-0.059 eV,-0.031 eV and-0.032 eV respectively. Accordingly, Gibbs free energy (ΔG) of hydrogen adsorption is extraordinarily near the ideal value (0 eV) for all the three types of functionalized GQDs. Thus, the present work suggests pathways for experimental realization of low-cost and multifunctional GQDs based catalysts for clean and renewable hydrogen energy production.

Regional Economic Development Research, 2021

Agriculture is one of the fundamental features of the Indian economy. Agriculture along with its ... more Agriculture is one of the fundamental features of the Indian economy. Agriculture along with its allied activities employs near about half of the population of India. The Himalayas form the major mountain ranges of the country and covers the northern and northeastern parts of the country. The Himalayan mountain region covers around 10 states of India including Jammu and Kashmir (J & K). The main source of livelihood of these regions is agriculture but the nature of agriculture is still traditional and is of subsistence type. The productivity is also low and unsatisfactory. This paper is an attempt to highlight some of the main problems faced by the farmers and to analyze prospects for the future growth of Himalayan agriculture. It also focused on analyzing the present status of farmers in the region. This paper is focused on district Kishtwar of J & K, a major Himalayan territory. The paper is based on primary data and a sample of 400 farmers has been taken for the study. The findin...

Journal of Drug Delivery and Therapeutics, 2020

Vayusadi guggulu vati (VGV), a polyherbal formulation is recommended for the management of diseas... more Vayusadi guggulu vati (VGV), a polyherbal formulation is recommended for the management of diseases like obesity, arthritis, hyperlipidaemia and hyper cholesterol. Though Vayusadi guggulu vati is widely used for the treatment of obesity in Ayurvedic System of Indian Medicine, but till date, its quality standard study has not been carried out. In the present article, we evaluated the total phenolic and flavonoid contents in the standarised polyherbal VGV. The total phenolic content was determined by Folin Ciocalteu reagent (FC reagent) method. Aluminum chloride colorimetric method was used for total flavonoids contents determination. The VGV was standardized by physic-chemical parameters like total ash value, acid insoluble ash, loss on drying (LOD), PH, extractive value, phytochemical tests and thin layer chromatography (TLC). Determination of microbial load in different dilutions was also performed. Quality determination of vati (tablet) was also evaluated with help of various tab...

2020 IEEE REGION 10 CONFERENCE (TENCON), 2020

Terahertz (THz) band communication is considered as a promising technology for 6G wireless techno... more Terahertz (THz) band communication is considered as a promising technology for 6G wireless technology due to availability of large bandwidth at THz bands. Most receivers for symbol detection need channel state information (CSI), however estimating CSI is complex for THz bands. Hence, in this paper, we design and analyze low complexity THz receiver without considering the CSI for symbol detection. The rate adaptation for THz communication systems is also analysed for the distance attenuation. Since, at THz the performance is sensitive to distance. We consider modified transmitted-reference (MTR) pulsed and optimal lth-order energy detector (OED) based THz communication system. Simulations are carried out to show effectiveness of MTR and OED for pulse-based THz band wireless systems by considering the effect of distance, data rate, and absorption by molecular gases.

International Journal of Advance Research and Innovative Ideas in Education, 2019

Cryptography is an art of secret writing. Major cryptography applications are Cryptographic hash ... more Cryptography is an art of secret writing. Major cryptography applications are Cryptographic hash functions (message digests), block chain, MAC, digital signature and digital time stamping. The cryptographic hash work is essentially utilized for security objectives for example, credibility, computerized marks, uprightness and many more. Blockchain is a growing list of transactions record. Blockchain-based applications are covering many fields including financial services, reputation systems, Internet of Things (IoT), healthcare, asset management, Insurance, Voting and Supply chain management. In this paper, the basic structure of blockchain is presented and general steps or procedure for utilizing blockchain in health care sector for managing patients records have been discussed. The concept of mining is related to the proof-of-work consensus algorithm. Although blockchain technology faces two major problems scalability and security. This paper contains an overview of healthcare serv...

RF MEMS Switches are one of the most prominent and remarkable future micro-machined products that... more RF MEMS Switches are one of the most prominent and remarkable future micro-machined products that have gain attention in last year’s. This Paper presents design, analysis and proposed fabrication process and simulation of a low actuated voltage shunt capacitive RF MEMS Switch. The Air gap in between the membrane and CPW signal line is 1.5 μm. The lowest actuation voltage of switch is 2 Volts. The proposed fixedfixed flexures beam design provides excellent RF Characteristics (Isolation -44 dB at 26.5 GHZ and insertion loss -0.26 dB at 26.5 GHZ). The results show that the proposed switch is suitable for Kaband applications.

International Journal of Research in Medical Sciences, 2020

Background: Substance use is emerging as a major cause of morbidity and mortality across the worl... more Background: Substance use is emerging as a major cause of morbidity and mortality across the world. Solan, a fast urbanizing town of India has witnessed mushrooming of industries and educational institutes. A surge in the persons booked under the Narcotic Drug and Psychoactive Substance Act 1985 led us to look into the determinants of the substance use in this region.Methods: We undertook a cross sectional study of one year secondary data analysis of 750 substance users screened at the de-addiction centre of Solan Hospital. The data mining was done by the cluster analysis technique. SPSS 16 and STATA 13 software were employed.Results: Mean age of users was 31 years with dominance of males (89.20 %), two third of total users were married, 75% were unemployed, 42% had upper school level education. About 60 and 38% were using cannabis and chitta (a synthetic opioid) respectively. Only 2% were consuming tobacco and alcohol. 62% of substance users had the fear of legal action and 44% had...

Journal of the Neurological Sciences, 2021

DAE SOLID STATE PHYSICS SYMPOSIUM 2019, 2020

Current Chemical Biology, 2020

Background: Microbial degradation of highly stable textile dyes, using lignin peroxidase, is an e... more Background: Microbial degradation of highly stable textile dyes, using lignin peroxidase, is an eco-friendly, less expensive and much advantageous in comparison to the chemical method. Objective: Biodegradation potential of lignin peroxidase (LiP), from Pseudomonas fluorescens LiP-RL5, was enhanced after optimization and purification so as to use it as a potential bioresource for the treatment of textile effluent. Methods: LiP producing bacterial isolate was primarily screened by methylene blue assay followed by LiP assay. The standard protocol was used for purification of lignin peroxidase and purified LiP was finally used for degradation of textile dyes. Results: 57 bacterial isolates were screened for lignin peroxidase activity. Isolate LiP-RL5 showed maximum activity (19.8 ±0.33 %) in terms of methylene blue reduction in comparison to others. Biochemical and molecular characterization of LiP-RL5 showed 99 % similarity with P. fluorescens. Lignin peroxidase activity was increased...

Journal of Natural Gas Science and Engineering, 2019

Abstract A multitechnique characterization approach has been used to quantitatively and qualitati... more Abstract A multitechnique characterization approach has been used to quantitatively and qualitatively evaluate all the reservoir quality parameters, crucial for the exploitation and development of unconventional shale plays. Characterization methods, in particular FTIR, XRF, NMR, MICP, HPP, LPP and High Pressure Permeameter were used on selected 20 younger and older shale samples of Cambay to determine their true petrophysics, mineralogy, brittleness and fracability potential with respect to depth. Properties mainly porosity, permeability, pore size distribution, mineralogy, brittleness, pore sizes and fracability were determined. It was found that younger cambay has medium size pores with high porosity, low silica and high clay content. On the contrary, older cambay has good pore connectivity, rich in organic and clay content, fair brittleness index and capable of producing hydrocarbons. The performed multidisciplinary analysis is first of its kind research and will go a long way in shale gas research and development in India at pilot scale. The generated data can be helpful in minimizing the research gap and hence the challenges associated with the commercial development of these prolific shales.

Asian Journal of Pharmacy and Pharmacology, 2018

Objective: The present study was conducted to evaluate hepatoprotective and antidyslipidemic acti... more Objective: The present study was conducted to evaluate hepatoprotective and antidyslipidemic activity of aqueous extract of in CCl induced hepatotoxicity and associated dyslipidemia and oxidative stress in rats. Ferula asafoetida 4 Material and methods: Hepatotoxicity was induced by administration of CCl (1mg/kg) in alternate days for a period 4 of 14 days. The animals were divided into 6 groups and aqueous extract of at dose level of 50mg/kg, 100 F. asafoetida mg/kg and 200 mg/kg was administered respectively for 21 days. Liv-52 (1ml/kg) was used as the standard drug. At the end day of the experiment, the blood was collected by retro-orbital puncture and the hepatoprotective effect was evaluated by analyzing biochemical parameters involved in liver damage. The extract was effective in Result: protecting the liver against the injury induced by CCl in rats. This was evident from significant reduction in serum 4 glutamic-pyruvic transaminase (SGPT), serum glutamic oxaloacetic transaminase (SGOT) and total bilirubin content. The extract revealed antioxidant and antihyperlipidemic activity too. It was concluded from the result that Conclusion: the aqueous extract of asafoetida possesses hepatoprotective activity against CCl induced hepatotoxicity in rats and 4 also play a beneficial role in CCl associated dyslipidemia and status of oxidative stress.

SSRN Electronic Journal, 2019

This paper explores the relationship between women’s involvement in SHG and their empowerment. On... more This paper explores the relationship between women’s involvement in SHG and their empowerment. One set of questionnaires, to analyzing the respondent’s association with SHG’s and corresponding empowerment. Statistical tools, such as descriptive statistics, Pearson’s correlation and linear regression and ANOVA was used to analyze the data. This paper finds that the length of membership in SHGs had a significant impact on the intensity of women’s social, personal political, empowerment and their perceptions on awareness on health and hygiene aspects. The findings provide the pivotal insight that the duration of the SHG member can play a crucial role in women empowerment.

Journal of Petroleum Exploration and Production Technology, 2018

Shale Gas exploration and production plays an essential role in ensuring energy security and econ... more Shale Gas exploration and production plays an essential role in ensuring energy security and economic stability. Tapping these reserves using cost-effective technologies can really change the India's energy supply and value chain. Cambay Shale of Cambay Basin has been proved as the most prominent Indian Shale reserve and in this work an attempt has been made to understand the geographical and mineralogical distribution of this Shale. A sample study on Cambay Shale of North Tectonic Block of Cambay Basin has been ascertained to understand the mineralogy, porosity and maturity with respect to depth. The study involves the use of integrated measurement techniques mainly high-pressure porosity (HPP), scanning electron microscopy (SEM) and Fourier transform electron microscopy (FTIR). Approximately, 13 samples were analysed to understand the mineralogy of this shale and it was observed that it is very clayey in nature with major traces of Illite and minor traces of rutile and kaolinite. The other measurements (i.e., SEM and HPP) were done on two specific samples which confirm the presence of clay-rich porous minerals with high organic matter content.

Applied Mathematics and Computation, 2018

In this paper, the problem of finding numerical solution for a system of Cauchy type singular int... more In this paper, the problem of finding numerical solution for a system of Cauchy type singular integral equations of first kind with index zero is considered. The analytic solution of such system is known. But it is of limited use as it is a nontrivial task to use it practically due to the presence of singularity in the known solution itself. Therefore, a residual based Galerkin method is proposed with Legendre polynomials as basis functions to find its numerical solution. The proposed method converts the system of Cauchy type singular integral equations into a system of linear algebraic equations which can be solved easily. Further, Hadamard conditions of well-posedness are established for system of Cauchy singular integral equations as well as for system of linear algebraic equations which is obtained as a result of approximation of system of singular integral equations with Cauchy kernel. The theoretical error bound is derived which can be used to obtain any desired accuracy in the approximate solution of system of Cauchy singular integral equations. The derived theoretical error bound is also validated with the help of numerical examples.

Day 2 Tue, November 13, 2018, 2018

Unconventional shale oil/gas has been envisaged as one of the most promising resources of India. ... more Unconventional shale oil/gas has been envisaged as one of the most promising resources of India. India is having enormous untapped shale oil/gas potential of 96 TCF risked technically recoverable shale gas and 3.8 billion barrel risked technically recoverable shale oil. But, its development is still nascent and not very much conducive due to insufficient data availability and limited exploration and exploitation activities. The present study is an attempt to minimize the existing data gap and providing useful information pertaining to shale geochemistry, sweet spots delineation, geomechanics and fracability. Shale has an important feature of acting as both source as well as reservoir for hydrocarbon generation, expulsion and accumulation. Demarcating sweet spots are helpful in identifying these prospective hydrocarbons bearing zones in shales and hence in locating favorable drilling targets. High content of organic matter, kerogen richness, clay content, shale geomechanics are the k...

International Journal of Engineering, Science and Technology, 2017

Accompanying the evolution of mechanical industry, the need for alloy materials and ceramics as w... more Accompanying the evolution of mechanical industry, the need for alloy materials and ceramics as well, having high toughness, hardness & impact resistance are also increasing. Wire-EDM process is a quick fix to this box. As this WEDM process is proficient in machining these materials meticulously, regardless to their toughness & hardness. The present work discusses the experimental study on wire-cut machining of EN8 Carbon Steel. This paper presents an Artificial Neural Network approach in a multi objective optimization problem, for predicting the performance measure of a machining process. The input neurons were designed by Taguchi Orthogonal Array with 5 levels each with the help of software Minitab 17. In this research work, a comparative study for predicting multiple response parameters have been carried out using Feed forward and Cascade forward back propagation algorithms of ANN. This study was conducted by varying the network designing in each case. Two different back-propagat...

Journal of Metastable and Nanocrystalline Materials, 2016

The objective of this paper is to study the low frequency acoustic vibration of Te2 cluster and C... more The objective of this paper is to study the low frequency acoustic vibration of Te2 cluster and CdSeTe nanoparticle embedded in borosilicate glass matrix. Lamb’s model is used to predict the occurrence of various mode to support the experimental observations by considering the elastic continuum model and fixed boundary condition. The presence of medium significantly affects the phonon peaks and results into the broadening of the modes. The linewidth is found to depend inversely on the size, similar to that reported experimentally.

Acta Crystallographica Section A Foundations and Advances, 2014

Bimetallic sulfate minerals, hydrated as well as anhydrous are important multifunctional material... more Bimetallic sulfate minerals, hydrated as well as anhydrous are important multifunctional materials which exhibit interesting properties like fast-ion conduction, ferroelectricity and magnetism with variation in temperature [1,2,3]. These properties are generally entwined with structural phase transitions and show structural frameworks made of interconnection of octahedra and tetrahedra [1]. Bimetallic sulfates, indeed are intercalation compounds of alkali ions generated by these frameworks and they possess high ionic conductivity [1]. In the present study, anhydrous and hydrous compounds of Na6M(SO4)4, (M=Mn, Ni, Co) were synthesized to understand the structural phase transitions and its relation to fast-ion conducting properties. Na6Mn(SO4)4, is monoclinic, space group P21/c with Z=2 and is isostructural to its Co and Ni analogues and shows high ionic conductivity and structural phase transition > 4500C. Na6Co(SO4).2H2O, Na6Ni(SO4).2H2O are isostructural with triclinic system ha...