VIDYA R
@sastra.edu
Assistant Professor, School of Civil Engineering
SASTRA Deemed UNIVERSITY
RESEARCH, TEACHING, or OTHER INTERESTS
Civil and Structural Engineering, Building and Construction
Scopus Publications
Scopus Publications
Arunraj Balasubramanian, Vidya Rajesh, Tomasz Bajda, Wei-Lung Tseng, A. Santhana Krishna Kumar, and N. Rajesh
Elsevier BV
Vidya R, Sathees Kumar, Cyril Thomas A, and Sharmila P
HARD Publishing Company
COVID 19 Pandemic in India had demanded an imposition of lockdown for three weeks initially and was extended further. This has drastic effect on air quality making it better because of control of vehicle emissions. This study analyzed the air quality in Chennai city using the parameters of pollution (NH 3, PM 2.5 , NO 2 , SO 2 , O 3 and CO) for air quality data for monitoring stations (three) spread over the city. National Air Quality Index (NAQI) has been used to present the quality of air spatially during lockdown and before lockdown. The concentrations of PM 2.5 among the pollutants selected showed a maximum reduction (-61%) compared to the pre-lockdown process. NO 2 (−40%) and CO (−32%) have also gone down when lockdown was in place, among other contaminants. In the different sections of the city, about 53% reduction in NAQI has been observed. Deep learning short-term predictions of various air pollutants are made in this study. The correlation between AQI and Pollutants (NH 3, PM 2.5 , NO 2 , SO 2 , O 3 and CO) in the study area modelled in deep learning using PYTHON. The classification of AQI class has been created in python with AQI values of Good (0-50), Satisfactory (51-100), Moderate (101-200), Poor (201-300), Very poor (301-400) and severe (>401). The study shows the level of co-relation of PM 2.5 being the highest. A linear regression model was performed and metrics such mean absolute error, r 2 to check the model performance for training and testing data are calculated. These results can be coupled with social, economic and Cultural factors that could have common emission patterns and air quality especially in metropolitan cities. The present study would aid authorities as it clearly shows that the quality can be made better if sources of emission can be diminished. This will pave way to protect and make the surroundings and environment better.
J. Preethi, P. Deepak, N. Nikhil, G. Omkar, R. Vidya, and P. Bhuvaneshwari
Elsevier BV
Sandeep Singh, Vidya Rajesh, and S. Moses Santhakumar
Springer Nature Singapore
Sandeep Singh, Vidya Rajesh, and S. Moses Santhakumar
Springer Nature Singapore
K. R. Kamala, Vidya Rajesh, Sandeep Singh, and P. Sharmila
Springer Nature Singapore
B. Arunraj, Vidya Rajesh, and N. Rajesh
Elsevier BV
Sathees Kumar, Vidya Rajesh, and Nazeer Khan
Springer Science and Business Media LLC
Sandeep Singh, Vidya Rajesh, and Selvaraj Moses Santhakumar
Periodica Polytechnica Budapest University of Technology and Economics
The existence of different types of Commercial Vehicles (CVs) in the shared roadway affects traffic flow characteristics differently from other vehicles. Owing to the uncertain placement and movement of these CVs in both longitudinal and lateral directions, the opportunities for lane changing and overtaking by other vehicles with lower maneuverability decrease, resulting in the formation of platoons. The study's primary aim is to assess the effect of mixed traffic platoons formed by three different classes of CVs on highway traffic speed, flow, and density under two different traffic regimes (regimes A and B). In this study, regime A represents the non-platooning condition, and regime B represents the platooning condition. Bi-directional traffic data was collected from the highway sections in India using an Infra-Red sensor-based device. The critical leading time headway is determined for the different CVs (platoon leaders) based on the mean absolute relative speed of platoons. The speed-flow-density plots are established using the macroscopic fundamental diagrams for the highway sections under regimes A and B to quantify the platooning impacts of CVs on the traffic characteristics. The study findings reveal that the speed at capacity, density at capacity, and traffic capacity decreased significantly due to CVs' influence on the general traffic mix during the mixed traffic platooning conditions. However, this effect was found to be relatively higher during the Heavy Commercial Vehicle operation as a platoon leader compared to Medium Commercial Vehicle and Light Commercial Vehicle as a platoon leader.
Vidya Rajesh, Yagendra Dharala, Prabesh Adhikari, and Sathees Kumar
Springer Nature Singapore
Sandeep Singh, Vidya Rajesh, Rajesh Kumar Panda, and S. Moses Santhakumar
IOP Publishing
Abstract Many pieces of research have concentrated on traffic speed, time headway, space headway, and so on under non-lane-based heterogeneous traffic streams. In contrast, limited studies have been conducted for analyzing and modeling the vehicular lateral position. The lateral position of vehicles plays an equally vital role in the development of microscopic models. Moreover, the vehicle characteristics such as the lateral position and speed are considered independent in the traffic simulation modeling, ignoring their correlation. This study investigates the relationship between the lateral position of vehicles with traffic speed on rural highways. For this purpose, the traffic data related to different vehicles’ lateral positions and speed were collected using an infra-red sensor instrument from the National Highways in India. The relationship of vehicles’ lateral position with the traffic speeds under different ranges is analyzed to understand their dependence. The study results show that the relationship between vehicles’ lateral position is significantly associated with the traffic speed. The study findings help formulate a microscopic simulation model to reproduce accurate maneuvering in the traffic stream, which is useful for analyzing traffic characteristics.
Balasubramanian Arunraj, Undru Sri Guna Kaushik, Vidya Rajesh, and N. Rajesh
Elsevier BV
E. Nandini, B. Arunraj, N. Rajesh, and Vidya Rajesh
Elsevier BV
Arunraj B, Sathvika Talasila, Vidya Rajesh, and Rajesh N.
Informa UK Limited
ABSTRACT The current study deals with the utility of Saccharomyces cerevisiae (yeast) immobilized in glutaraldehyde cross-linked chitosan matrix for the removal of Eu(III) from aqueous solution. The biosorbent was characterized using FT-IR, SEM-EDX, XRD, TGA, and XPS analysis. Experimental variables that influence the adsorption were studied and the concentration of Europium was determined by ion chromatography. At pH 5.0, the adsorption was spontaneous and endothermic in nature. The biosorbent gave a Langmuir adsorption capacity of 19.41 mg g−1 and followed pseudo second-order kinetics. The regeneration of biosorbent was achieved using potassium thiocyanate and the method showed good selectivity.
T. Sathvika, Smruthi Balaji, Mritunjai Chandra, Amitesh Soni, Vidya Rajesh, and N. Rajesh
Elsevier BV
Balasubramanian Arunraj, Talasila Sathvika, Vidya Rajesh, and N. Rajesh
American Chemical Society (ACS)
The mounting demand for rare earth elements (REEs) and the similarities in their chemical and physical properties render their separation and selective recovery quite challenging. Microbe-based adsorbents are quite effective owing to their diverse functional groups on the cell wall and are perceived to be environmentally benign. This work reports the application of yeast (Saccharomyces cerevisiae) embedded in cellulose matrix as an efficient adsorbent for the separation of Eu(III) from aqueous medium. The fungi–biopolymer combination acts as a good host to welcome Eu(III) on its surface through effective coordination with the diverse functional groups. The pH, adsorbent dosage, isotherm studies, and thermodynamic and kinetic parameters were studied, and the characterization was done using FT-IR, XRD, XRF, XPS, SEM-EDX, BET, and confocal microscopy techniques. Ion chromatography was used to monitor the quantitative measurement of Eu(III) during the course of adsorption and desorption process. The regenerat...
T. Sathvika, Akhil Raj Kumar Saraswathi, Vidya Rajesh, and N. Rajesh
Royal Society of Chemistry (RSC)
Chromium in its hexavalent oxidation state is carcinogenic and wastewater from the electroplating industry is one of the principal sources of pollution.
T. Sathvika, Amitesh Soni, Kriti Sharma, Malipeddi Praneeth, Manasi Mudaliyar, Vidya Rajesh, and N. Rajesh
Springer Science and Business Media LLC
AbstractThe presence of harmful contaminants in the waste stream is an important concern worldwide. The convergence of biotechnology and nanoscience offers a sustainable alternative in treating contaminated waters. Hexavalent chromium, being carcinogenic deserves effective and sustainable methods for sequestration. Here in, we report the immobilization of a prokaryote (Rhizobium) and eukaryote (Saccharomyces cerevisiae) in multiwalled carbon nanotubes (MWCNTs) for the effective adsorption of hexavalent chromium. The carboxylic groups were introduced into the MWCNTs during oxidation using potassium permanganate and were subjected to EDC-HOBT coupling to bind with microbial cell surface. FTIR, TGA, BET, FESEM-EDAX, HRTEM, XPS and confocal microscopy were the investigative techniques used to characterize the developed biosorbents. Experimental variables such as pH, adsorbent dosage, kinetics, isotherms and thermodynamics were investigated and it was observed that the system follows pseudo second order kinetics with a best fit for Langmuir isotherm. Electrostatic interactions between the functional groups in the microbial cell wall and hydrochromate anion at pH 2.0 propel the adsorption mechanism. The lab scale column studies were performed with higher volumes of the Cr(VI) contaminated water. Sodium hydroxide was used as the desorbing agent for reuse of the biosorbents. The sustainable biosorbents show prospects to treat chromium contaminated water.
Manasi, Aditya Tibrewal, N. Rajesh, and Vidya Rajesh
Elsevier BV
Manasi, Vidya Rajesh, and N. Rajesh
Elsevier BV
Talasila Sathvika, Manasi Mudaliyar, Vidya Rajesh, and Nagarathnam Rajesh
Wiley
AbstractMultidisciplinary approach involving biotechnology and chemistry opens up avenues to develop adsorbent materials that can be very useful to alleviate heavy metal toxicity. Towards this direction, we have explored the potential of endomycorrizhal fungal spores in conjunction with a clay mineral as a novel approach for chromium (VI) adsorption. The immobilization of AMF (Arbuscular Mycorrhizal fungus) spores in montmorillonite (in its Na+ form) provides a good platform to adsorb hexavalent chromium. The adsorption was observed at pH 2.0‐3.0 involving the electrostatic interaction between the functional groups present in the fungi‐clay biosorbent surface and tetraoxohydrochromate (VI) anion. Diverse characterization techniques such as Fourier Transform‐Infrared spectroscopy (FTIR), X‐ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), confocal microscopy and X‐ray fluorescence (XRF) were used to observe the interaction of chromium with the biosorbent. Batch adsorption studies involving the experimental variables such as pH variation, kinetics, isotherms and thermodynamics were performed. Pseudo second order kinetics coupled with a Langmuir adsorption capacity of 11.185 mg g−1was realized for this biosorption process. The biosorbent was stable and regenerated for three adsorption‐desorption cycles using sodium hydroxide.
Mahesh Kumar Kalikiri, Madhu Poornima Mamidala, Ananth N. Rao, and Vidya Rajesh
Wiley
Autism spectrum disorder (ASD) is a neuro developmental disorder, reported to be on a rise in the past two decades. Thyroid hormone‐T3 plays an important role in early embryonic and central nervous system development. T3 mediates its function by binding to thyroid hormone receptors, TRα and TRβ. Alterations in T3 levels and thyroid receptor mutations have been earlier implicated in neuropsychiatric disorders and have been linked to environmental toxins. Limited reports from earlier studies have shown the effectiveness of T3 treatment with promising results in children with ASD and that the thyroid hormone levels in these children was also normal. This necessitates the need to explore the genetic variations in the components of the thyroid hormone pathway in ASD children. To achieve this objective, we performed genetic analysis of ligand binding domain of THRA and THRB receptor genes in 30 ASD subjects and in age matched controls from India. Our study for the first time reports novel single nucleotide polymorphisms in the THRA and THRB receptor genes of ASD individuals. Autism Res 2017, 10: 1919–1928. ©2017 International Society for Autism Research, Wiley Periodicals, Inc.Lay SummaryThyroid hormone (T3) and thyroid receptors (TRα and TRβ) are the major components of the thyroid hormone pathway. The link between thyroid pathway and neuronal development is proven in clinical medicine. Since the thyroid hormone levels in Autistic children are normal, variations in their receptors needs to be explored. To achieve this objective, changes in THRA and THRB receptor genes was studied in 30 ASD and normal children from India. The impact of some of these mutations on receptor function was also studied.
Manasi, Sridev Mohapatra, N. Rajesh, and Vidya Rajesh
Springer Science and Business Media LLC
AbstractIn living systems, environmental stress due to biotic and abiotic factors triggers the production of myriad metabolites as a potential mechanism for combating stress. Among these metabolites are the small polycationic aliphatic amine molecules - polyamines, which are ubiquitous in all living organisms. In this work, we demonstrate a correlation between cellular concentration of three major polyamines (putrescine, spermidine and spermine) with lead exposure on bacteria for a period of 6–24 h. We report that indigenously isolated Halomonas sp. strain BVR 1 exhibits lead induced fluctuations in their cellular polyamine concentration. This response to lead occurs within 6 h post metal treatment. During the same time interval there was a surge in the growth of bacteria along with an enhancement in the putrescine levels. We conclude that in Halomonas sp. strain BVR 1, an early response is seen with respect to modulation of polyamines as a result of lead treatment and hypothesize that endogenous polyamines contribute towards scavenging lead in these bacteria.
C. N. Rahul, K. Shiva Krishna, Atul P. Pawar, and Vidya Rajesh
Informa UK Limited
The P. falciparum serine repeat antigen (PfSERA5) is the most abundantly expressed protein in the parasitophorous vacuole during the asexual blood stage and serves as both drug and vaccine target. The processed central fragment (56 KDa) of PfSERA5 is implicated to play an important role in parasite exit (egress) during schizont rupture from erythrocytes. Structural characterization of its enzymatic domain supports protease-like function for this central domain. The understanding of exact functional role of PfSERA5 in parasite egress remains unconfirmed as recent studies also indicate an indispensable non-catalytic role for PfSERA5 putative enzyme domain in the blood stage. No structural insight into PfSERA5 prodomain is available. Structure prediction of PfSERA5 prodomain using in silico approach in our study, showed it to have structural similarity with calcium-binding proteins. An earlier observation of steep rise in intracellular calcium concentration as an important factor in egress makes the prodomain calcium-binding role significant. The implication of calcium on structure and activity of PfSERA5 putative enzyme domain is also unknown, and such information would aid to substantiating any calcium-dependent effects on PfSERA5. To understand this, we performed molecular dynamic (MD) simulation both in the presence and absence of calcium. MD results show secondary structure conformational differences in local regions of protein structure. Our results support calcium to be an important parameter for stability and function of PfSERA5. This computational assessment suggest a need to design future experiments like calcium-dependent inhibition studies to reveal exact functional role of PfSERA5 in parasite egress.
T. Sathvika, Manasi, Vidya Rajesh, and N. Rajesh
Elsevier BV