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Food resource and temporal partitioning amongst a guild of predatory agroecosystem-inhabiting ant species

Current Zoology 2009年第5期55卷 366-375页

作者： vivek mohan agarwal Neelkamal RASTOGI Center of Advanced Study in Zoology Banaras Hindu University

Prey diversity and temporal foraging patterns of six abundant,predatory ant species were investigated seasonally in an agroecosystem with two main vegetable *** *** the highest predation success and therefore appears to be the dominant species while Tapinoma melanocephalum showed the lowest success under the natural field *** of prey diversity and temporal activity patterns with the null model tests of niche overlap revealed a significant overlap indicating that the activity periods and prey diversity may not be solely influenced by interactions among the co-existing ant ***,niche partitioning in the daily peak activity periods was demonstrated during all the three seasons(summer,rainy and winter)particularly between Pheidole *** *** *** a high intensity,broadly extended mono-modal foraging *** compressus and *** showed bi-modality in their foraging activity during the rainy season and mono-modal patterns during summer and winter *** tesserinoda,Tetramorium *** *** exhibited peak foraging activities in the morning hours during the summer and rainy *** activity profiles of *** and *** were skewed towards late afternoon hours during the winter season indicating avoidance of foraging activity during the favourable periods when the more aggressive Pheidole *** *** the sponge gourd agroecosystem,the ants captured predominantly hymenopteran,orthopteran and coleopteran *** Pheidole *** mainly the large orthopteran prey,other ant species captured worker ants in the sponge gourd *** the cauliflower agroecosystem,while other species captured prey chiefly belonging to six orders,i.e.,Lepidoptera,Hymenoptera,Coleoptera,Hemiptera,Isoptera and Diptera,Pheidole *** *** were the only species to also hunt many orthopteran *** agroecosystem-inhabiting ant speci

关键词： Niche partitioning Temporal niche Prey diversity Annual cropping system

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COVID-19:Review on Its Etiology,Pathogenesis,and Existence in Humans

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BIOCELL 2020年第4期44卷 461-467页

作者： vivek KUMAR VISHNU agarwal Department of Biotechnology Motilal Nehru National Institute of TechnologyAllahabad211004India

The world is facing a new healthcare crisis with the rise and spread of novel coronavirus since December *** known as Severe Acute Respiratory Syndrome Corona Virus-2(SARS-CoV-2),the disease associated with SARSCoV-2 is even called ***-19 is having a pulverizing impact on the scientific *** of August 13,2020,the number of confirmed cases had reached up to 20,439,814 and the death toll to 744,385,affecting more than 188 territories across the *** these difficult times,the world is looking towards research and clinical work from different scientific communities to lead the way to a solution to the *** this review,we are focusing on COVID-19 emergence,pathogenicity,and existence in humans,as well as the SARS-CoV-2 infection mechanism and its similarities to previous coronavirus strains.

关键词： COVID-19 SARS-CoV MERS-CoV

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EXECUTER2 modulates the EXECUTER1 signalosome through its singlet oxygen-dependent oxidation

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Molecular Plant 2022年第3期15卷 438-453页

作者： vivek Dogra Rahul mohan Singh Mengping Li Mingyue Li Somesh Singh Chanhong Kim Shanghai Center for Plant Stress Biology CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of Sciences Beijing 100049China Present address:Biotechnology Division CSIR-Institute of Himalayan Bioresource TechnologyPalampur 176061India

Oxidative post-translational modifications of specific chloroplast proteins contribute to the initiation of retrograde *** Arabidopsis thaliana EXECUTER1(EX1)protein,a chloroplast-localized singlet oxygen(^(1)O_(2))sensor,undergoes tryptophan(Trp)643 oxidation by^(1)O_(2),a chloroplast-derived and light-dependent reactive oxygen *** indole side chain of Trp is vulnerable to^(1)O_(2),leading to the generation of oxidized Trp variants and priming EX1 for degradation by a membrane-bound FtsH *** perception of^(1)O_(2)via Trp643 oxidation and subsequent EX1 proteolysis facilitate chloroplast-to-nucleus retrograde *** this study,we discovered that the EX1-like protein EX2 also undergoes^(1)O_(2)-dependent Trp530 oxidation and FtsH-dependent turnover,which attenuates^(1)O_(2)signaling by decelerating EX1-Trp643 oxidation and subsequent EX1 *** with this finding,the loss of EX2 function reinforces EX1-dependent retrograde signaling by accelerating EX1-Trp643 oxidation and subsequent EX1 proteolysis,whereas overexpression of EX2 produces molecular phenotypes opposite to those observed in the loss-of-function mutants of ***,phylogenetic analysis suggests that EX2 may have emerged evolutionarily to attenuate the sensitivity of EX1 toward^(1)O_(2).Collectively,these results suggest that EX2 functions as a negative regulator of the EX1 signalosome through its own^(1)O_(2)-dependent oxidation,providing a new mechanistic insight into the regulation of EX1-mediated^(1)O_(2)signaling.

关键词： EXECUTER1 EXECUTER2 singlet oxygen retrograde signaling Trp oxidation FtsH protease

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Analysis and simulation of a single-phase seven-level inverter controlled by modified sinusoidal PWM technique

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第4期12卷 120-139页

作者： V.Srinath Man mohan agarwal D.K.Chaturvedi Department of Electrical Engineering Faculty of Engineering Dayalbagh Educational InstituteAgraIndia

In this paper,a modified sinusoidal pulse width modulation(MSPWM)technique and a modified single-phase H-bridge seven-level inverter is *** switching pulses for the proposed seven-level inverter are generated using a single triangular carrier waveform,a fully rectified sinusoidal signal,and three stepped reference signals(Uref1,Uref2 and Uref3).Using optimization technique,the magnitude of the stepped reference signal is determined so that the total harmonic distortion(THD)of the output voltage waveform is minimum and the fundamental component,RMS value of the voltage is improved for a given modulation index Ma as compared to the sinusoidal pulse width modulation(SPWM).By the implementation of the new scheme,the seven-level of the inverter output voltage level(+Vdc,+2Vdc/3,+Vdc/3,0,−Vdc,−2Vdc/3,−Vdc)is obtained for any given modulation ***,if only two stepped reference signals are used then the inverter will act as a five-level inverter for any modulating index *** proposed MSPWM and seven-level inverter are simulated on MATLAB/SIMULINK for R,R-L load and on a single-phase capacitor-start and capacitor-start-run Induction Motor.

关键词： Induction motor MATLAB/SIMULINK Seven-level inverter single triangular carrier SPWM stepped reference signals THD

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A Reliable and Accurate Calculation of Excitation Capacitance Value for an Induction Generator Based on Interval Computation Technique

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International Journal of Automation and computing 2011年第4期8卷 429-436页

作者： Rajesh Kumar Thakur vivek agarwal Paluri S. V. Nataraj Systems and Control Engineering Interdisciplinary Programme (IDP)Mumbai 400076 India Department of Electrical Engineering IIT-Bombay Powai Mumbai 400076 India

A squirrel cage induction generator （SCIG） offers many advantages for wind energy conversion systems but suffers from poor voltage regulation under varying operating conditions. The value of excitation capacitance （C exct ） is very crucial for the selfexcitation and voltage build-up as well as voltage regulation in SCIG. Precise calculation of the value of C exct is, therefore, of considerable practical importance. Most of the existing calculation methods make use of the steady-state model of the SCIG in conjunction with some numerical iterative method to determine the minimum value of C exct . But this results in over estimation, leading to poor transient dynamics. This paper presents a novel method, which can precisely calculate the value of C exct by taking into account the behavior of the magnetizing inductance during saturation. Interval analysis has been used to solve the equations. In the proposed method, a range of magnetizing inductance values in the saturation region are included in the calculation of C exct , required for the self-excitation of a 3-φ induction generator. Mathematical analysis to derive the basic equation and application of interval method is presented. The method also yields the magnetizing inductance value in the saturation region which corresponds to an optimum C exct（min） value. The proposed method is experimentally tested for a 1.1 kW induction generator and has shown improved results.

关键词： d-q model hull consistency induction generator interval analysis interval arithmetic optimization range of interval realpaver self-excitation transients.

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A New Energy Optimal Control Scheme for a Separately Excited DC Motor Based Incremental Motion Drive

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International Journal of Automation and computing 2009年第3期6卷 267-276页

作者： Milan A. Sheta vivek agarwal Paluri S. V. Nataraj Systems and Control Engineering Indian Institute of Technology Bombay Department of Electrical Engineering Indian Institute of Technology Bombay

This paper considers minimization of resistive and frictional power dissipation in a separately excited DC motor based incremental motion drive （IMD）. The drive is required to displace a given, fixed load through a definite angle in specified time, with minimum energy dissipation in the motor windings and minimum frictional losses. Accordingly, an energy optimal （EO） control strategy is proposed in which the motor is first accelerated to track a specific speed profile for a pre-determined optimal time period. Thereafter, both armature and field power supplies are disconnected, and the motor decelerates and comes to a halt at the desired displacement point in the desired total displacement time. The optimal time period for the initial acceleration phase is computed so that the motor stores just enough energy to decelerate to the final position at the specified displacement time. The parameters, such as the moment of inertia and coefficient of friction, which depend on the load and other external conditions, have been obtained using system identification method. Comparison with earlier control techniques is included. The results show that the proposed EO control strategy results in significant reduction of energy losses compared to the existing ones.

关键词： Energy optimal control speed profile incremental motion drive (IMD).

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Baastrup's disease: The kissing spine

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World Journal of Clinical Cases 2014年第2期2卷 45-47页

作者： Amit Singla vivek Shankar Samarth Mittal Abhinav agarwal Bhavuk Garg Department of Orthopaedics All India Institute of Medical Sciences

A 67-year-old male presented with a gradually progressive low back pain of 2 years duration. The patient was leading a retired life and there was no history of chronic fever or significant trauma. There was no radiation of pain or any features suggestive of claudication. There was no history of any comorbidity. The pain was aggravated with extension of the spine and relieved with flexion. There was no swelling or neurological deficit, but muscle spasm was present. Radiographs of the spine revealed degenerative changes in the lumbosacral spine, along with articulation of spinous processes at in lumbar spine at all levels level suggestive of Baastrup's disease, commonly known as "kissing spine". Routine blood investigations were within normal limits. The patient was managed conservatively. He was given a week's course of analgesics and muscle relaxants and then started on spinal flexion exercises, with significant improvement being noted at 6 months follow up.

关键词： Baastrup’s disease Neoarthrosis Spinous process Kissing spine Osteophytes Low back ache Back pain

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Transcranial direct current stimulation as early augmentation in adolescent obsessive compulsive disorder:A pilot proof-of-concept randomized control trial

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World Journal of Clinical Pediatrics 2024年第2期13卷 161-170页

作者： Aditya Agrawal vivek agarwal Sujita Kumar Kar Amit Arya Department of Psychiatry King George Medical UniversityUttar PradeshLucknow 226003India

BACKGROUND Transcranial direct current stimulation(tDCS)is proven to be safe in treating various neurological conditions in children and *** is also an effective method in the treatment of OCD in *** To assess the safety and efficacy of tDCS as an add-on therapy in drug-naive adolescents with *** We studied drug-naïve adolescents with OCD,using a Children’s Yale-Brown obsessive-compulsive scale(CY-BOCS)scale to assess their *** active and sham groups were given fluoxetine,and we applied cathode and anode over the supplementary motor area and deltoid for 20 min in 10 *** occurred at 2,6,and 12 wk using *** Eighteen adolescents completed the study(10-active,8-sham group).CY-BOCS scores from baseline to 12 wk reduced significantly in both groups but change at baseline to 2 wk was significant in the active group *** mean change at 2 wk was more in the active group(11.8±7.77 vs 5.25±2.22,P=0.056).Adverse effects between the groups were *** tDCS is safe and well tolerated for the treatment of OCD in ***,there is a need for further studies with a larger sample population to confirm the effectiveness of tDCS as early augmentation in OCD in this population.

关键词： Adolescents Early augmentation Obsessive compulsive disorder Safety Transcranial direct current stimulation

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The Intersection of Privacy by Design and Behavioral Economics: Nudging Users towards Privacy-Friendly Choices

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Journal of Information Security 2024年第4期15卷 557-563页

作者： vivek Kumar agarwal Meta Platforms Inc Kent Washington USA

This paper conducts a comprehensive review of existing research on Privacy by Design (PbD) and behavioral economics, explores the intersection of Privacy by Design (PbD) and behavioral economics, and how designers can leverage “nudges” to encourage users towards privacy-friendly choices. We analyze the limitations of rational choice in the context of privacy decision-making and identify key opportunities for integrating behavioral economics into PbD. We propose a user-centered design framework for integrating behavioral economics into PbD, which includes strategies for simplifying complex choices, making privacy visible, providing feedback and control, and testing and iterating. Our analysis highlights the need for a more nuanced understanding of user behavior and decision-making in the context of privacy, and demonstrates the potential of behavioral economics to inform the design of more effective PbD solutions.

关键词： Privacy by Design Behavioral Economics Nudges User-Centric Design Data Protection Cognitive Biases Heuristics

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Secure Cloud Data Storage System Using Hybrid Paillier–Blowsh Algorith

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Computers, Materials & Continua 2021年第4期67卷 779-798页

作者： Bijeta Seth Surjeet Dalal Dac-Nhuong Le vivek Jaglan Neeraj Dahiya Akshat Agrawal Mayank mohan Sharma Deo Prakash K.D.Verma SRM University Delhi-NCRSonipatHaryana131029India Institute of Research and Development Duy Tan UniversityDanang550000Vietnam Department of Information Technology Duy Tan UniversityDanang 550000Vietnam Graphic Era Hill University DehradunUttarakhand248171India Amity University Haryana122412India Principal Software Lead Zillow Inc.USA School of Computer Science&Engineering Faculty of EngineeringSMVD UniversityKakryalKatra182320India Material Science Research Laboratory Department of PhysicsS.V.CollegeAligarh202001India

Cloud computing utilizes enormous clusters of serviceable and manageable resources that can be virtually and dynamically recongured in order to deliver optimum resource utilization by exploiting the pay-per-use ***,concerns around security have been an impediment in the extensive adoption of the cloud computing *** this regard,advancements in cryptography,accelerated by the wide usage of the internet worldwide,has emerged as a key area in addressing some of these security *** this document,a hybrid cryptographic protocol deploying Blowsh and Paillier encryption algorithms has been presented and its strength compared with the existing hybrid Advanced Encryption Standard(AES)and Rivest Shamir Adleman(RSA)*** for secure data storage protocol in two phases have been *** proposed hybrid protocol endeavors to improve the power of cloud storage through a decrease in computation time and ciphertext *** have been carried out with Oracle Virtual Box and Fog server used on an Ubuntu 16.04 *** grouping of asymmetric and homomorphic procedures has demonstrated enhanced *** usage has helped in decreasing the storage space and computation *** analysis in terms of computation overhead and quality of service parameters like loads of parameters with and without attacks,throughput,and stream length for different modes of block cipher mode has been carried *** analysis has been carried out by utilizing the Hardening Index as an audit parameter using Lynis ***,for halting the aforementioned approaches and for regulating trafc,rewall protection has been generated in the chosen hybrid ***,enhancements in the performance of the Paillier and Blowsh hybrid scheme with and without compression compared to the existing schemes using RSA and AES procedures have been demonstrated.

关键词： Cryptography blowsh homomorphic paillier cloud computing

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