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Appraisal of pollution and health risks associated with coal mine contaminated soil using multimodal statistical and Fuzzy-TOPSIS approaches

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 101-115页

作者： sumit kumar Sonali Banerjee Saibal Ghosh Santanu Majumder Jajati Mandal Pankaj kumar Roy Pradip Bhattacharyya Agricultural and Ecological Research Unit Indian Statistical InstituteGiridih815301India Department of Life and Environmental Sciences Bournemouth University(Talbot Campus)Fern BarrowPooleBH12 5BBUK School of Sciences Engineering & EnvironmentUniversity of SalfordSalfordM5 4QJUK School of Water Resource Engineering Jadavpur UniversityKolkata700032India School of Environmental Studies Jadavpur UniversityKolkata700032India

The present study assesses the concentration,probabilistic risk,source classification,and dietary risk arising from heavy metal(HMs)pollution in agricultural soils affected by coal mining in eastern part of *** of soil and rice plant indicated significantly elevated levels of HMs beyond the permissible limit in the contaminated zones(zone 1:PbSoil:108.24±72.97,CuSoil:57.26±23.91,CdSoil:8.44±2.76,CrSoil:180.05±46.90,NiSoil:70.79±25.06 mg/kg;PbGrain:0.96±0.8,CuGrain:8.6±5.1,CdGrain:0.65±0.42,CrGrain:4.78±1.89,NiGrain:11.74±4.38 mg/*** 2:PbSoil:139.56±69.46,CuSoil:69.89±19.86,CdSoil:8.95±2.57,CrSoil:245.46±70.66,NiSoil:95.46±22.89 mg/kg;PbGrain:1.27±0.84,CuGrain:7.9±4.57,CdGrain:0.76±0.43,CrGrain:8.6±1.58,NiGrain:11.50±2.46 mg/kg)compared to the uncontaminated zone(zone 3).Carcinogenic and non-carcinogenic health risks were computed based on the HMs concentration in the soil and rice grain,with Pb,Cr,and Ni identified as posing a high risk to human *** Carlo simulation,the solubility-free ion activity model(FIAM),and severity adjusted margin of exposure(SAMOE)were employed to predict health *** hazard quotient(HQ)values for Ni,Cr,Cd,and Pb were>1,indicating a significant non-carcinogenic ***(risk thermometer)results for contaminated zones ranged from low to moderate risk(CrSAMOE:0.05,and NiSAMOE:0.03).Fuzzy-TOPSIS and variable importance plots(from random forest)showed that Ni and Cr were mostly responsible for the toxicity in the rice plant,respectively.A self-organizing map for source classification revealed common origin for the studied HMs with zone 2 exhibiting the highest *** positive matrix factorization model for the source apportionment identified coal mining and transportation as the predominant sources of *** distribution analysis indicated higher contamination near mining sites as compared to distant sampling ***,this study will aid environmental scientists and policymakers controllin

关键词： Coal mine Free ion activity model Monto Carlo Simulation Pollution and Health risk Fuzzy-TOPSIS

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Advances in the design and manufacturing of novel freeform optics

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International Journal of Extreme Manufacturing 2022年第3期4卷 65-97页

作者： sumit kumar Zhen Tong Xiangqian Jiang EPSRC Future Metrology Hub Centre for Precision TechnologiesUniversity of HuddersfieldHuddersfield HD13DHUnited Kingdom

Freeform optics has become the most prominent element of the optics industry. Advanced freeform optical designs supplementary to ultra-precision manufacturing and metrology techniques have upgraded the lifestyle, thinking, and observing power of existing *** related to space explorations, portability, accessibility have also witnessed sensible in today’s time with freeform optics. Present-day design methods and fabrications techniques applicable in the development of freeform optics and the market requirements are focussed and explained with the help of traditional and non-traditional optical applications. Over the years,significant research is performed in the emerging field of freeform optics, but no standards are established yet in terms of tolerances and definitions. We critically review the optical design methods for freeform optics considering the image forming and non-image forming applications. Numerous subtractive manufacturing technologies including figure correction methods and metrology have been developed to fabricate extreme modern freeform optics to satisfy the demands of various applications such as space, astronomy, earth science, defence,biomedical, material processing, surveillance, and many more. We described a variety of advanced technologies in manufacturing and metrology for novel freeform optics. Next, we also covered the manufacturing-oriented design scheme for advanced optics. We conclude this review with an outlook on the future of freeform optics design, manufacturing and metrology.

关键词： freeform optics optical design optical fabrication ultra-precision machining surface metrology

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A Constant Gain and Miniaturized Antipodal Vivaldi Antenna for 5G Communication Applications

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Computers, Materials & Continua 2022年第12期73卷 4909-4921页

作者： Amruta SDixit sumit kumar Shabana Urooj Symbiosis Institute of Technology Symbiosis International(Deemed University)Pune412115India Department of Electrical Engineering College of EngineeringPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia

This paper proposes a stable gain and a compact Antipodal Vivaldi Antenna(AVA)for a 38GHz band of 5G communication.A novel compact AVA is designed to provide constant gain,high front to back ratio(FBR),and very high *** performance of the proposed AVA is enhanced with the help of a dielectric lens(DL)and corrugations.A rectangular-shaped DL is incorporated in conventional AVA(CAVA)to enhance its gain up to 1 dBi and the bandwidth by 1.8 ***,the rectangular corrugations are implemented in CAVA with lens(CAVA-L)to further improve the gain and *** proposed AVA with lens and corrugations(AVA-LC)gives a constant and high gain of 8.2 to 9 *** designed AVA-LC operates from 34 to 45GHz frequency which covers 38GHz(37.5 to 43.5 GHz)band of 5G ***,the presented AVA-LC mitigates the back lobe and sidelobe levels,resulting in FBR and efficiency *** FBR is in the range of 12.2 to 22 dB,and efficiency is 99%,almost *** AVA-LC is fabricated on Roger’s RT/duroid 5880 substrate,and it is tested to verify the simulated *** proposed compact AVA-LC with high gain,an improved FBR,excellent efficiency,and stable radiation patterns is suitable for the 38GHz band of 5G devices.

关键词： Antipodal Vivaldi Antenna(AVA) constant gain dielectric lens(DL) 5G communication corrugations front to back ratio(FBR)

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Induced structural modifications in ZnS nanowires via physical state of catalyst:Highlights of 15R crystal phase

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Nano Research 2022年第1期15卷 377-385页

作者： sumit kumar Frederic Fossard Gaelle Amiri Jean-Michel Chauveau Vincent Sallet Groupe d'Etude de la Matiere Condensee(GEMAC) Universite Paris-SaclayCNRS-Universite de Versailles St Quentin en Yvelines45 avenue des Etats-UnisVersailles 78035France Laboratoire d'Etude des Microstructures(LEM) CNRS-ONERAUniversite Paris-Saclay29 avenue Division LeclercChatillon 92322France

Peculiar and unique growth mechanisms involved in semiconductor nanowires(NWs)pave the way to the achievement of new crystallographic phases and remarkable material properties,and hence,studying polytypism in semiconductor NWs arouses a strong interest for the next generation of electronic and photonic *** this context,the growth of ZnS nanowires has been investigated,as bulk ZnS compound exhibits numerous unstable polytypes at high temperatures,but their stable occurrence is highly anticipated in a nanowire due to its special quasi-dimensional shape and growth *** this work,the idea is to provide a change in the growth mechanism via the physical state of catalyst droplet(liquid or solid)and hence,study the induced structural modifications in ZnS *** HRTEM images of VLS(via liquid alloyed catalyst)grown ZnS NWs show periodic stacking faults,which is precisely identified as a stacking sequence of cubic or hexagonal individual planes leading to an astonishing 15R crystal *** crystallographic phase is observed for the first time in ***,NWs grown with VSS(via solid catalyst)show crystal polytypes of zinc blende and *** calculate and discuss the role of cohesive energies in the formation of such ZnS ***,we present the selection rules for the crystallization of such 15R structure in NWs and discuss the involved VLS and VSS growth mechanisms leading to the formation of different crystal phases.

关键词： ll-VI semiconductors MOCVD vapor-liquid-solid(VLS) vapor-solid-solid(VSS) TEM analysis polytypism

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Optimal Unification of Static and Dynamic Features for Smartphone Security Analysis

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Intelligent Automation & Soft Computing 2023年第1期35卷 1035-1051页

作者： sumit kumar S.Indu Gurjit Singh Walia Scientific Analysis Group DRDODelhi110054India Delhi Technological University Delhi110042India

Android Smartphones are proliferating extensively in the digital world due to their widespread applications in a myriad *** increased popularity of the android platform entices malware developers to design malicious apps to achieve their malevolent ***,static analysis approaches fail to detect run-time behaviors of malicious *** address these issues,an optimal unification of static and dynamic features for smartphone security analysis is *** proposed solution exploits both static and dynamic features for generating a highly distinct unified feature vector using graph based cross-diffusion ***,a unified feature is subjected to the fuzzy-based classification model to distinguish benign and malicious *** suggested framework is extensively experimentally validated through both qualitative and quantitative analysis and results are compared with the existing *** evaluation over benchmarked datasets from Google Play Store,Drebin,Androzoo,AMD,and CICMalDroid2020 revealed that the suggested solution outperforms state-of-the-art *** achieve average detection accuracy of 98.62%and F1 Score of 0.9916.

关键词： Fusion smartphone android security analysis malware detection

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Hereditary fructose intolerance: A comprehensive review

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World Journal of Clinical Pediatrics 2022年第4期11卷 321-329页

作者： sumit kumar Singh Moinak Sen Sarma Department of Pediatrics Sri Aurobindo Medical College and PGIIndore 453555Madhya PradeshIndia Department of Pediatric Gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014India

Hereditary fructose intolerance(HFI)is a rare autosomal recessive inherited disorder that occurs due to the mutation of enzyme aldolase B located on chromosome 9q22.3.A fructose load leads to the rapid accumulation of fructose 1-phosphate and manifests with its downstream *** commonly children are affected with gastrointestinal symptoms,feeding issues,aversion to sweets and *** manifestations include an asymptomatic increase of transaminases,steatohepatitis and rarely liver *** involvement usually occurs in the form of proximal renal tubular acidosis and may lead to chronic renal *** confirmation,a genetic test is favored over the measurement of aldolase B activity in the liver biopsy *** crux of HFI management lies in the absolute avoidance of foods containing fructose,sucrose,and sorbitol(FSS).There are many dilemmas regarding tolerance,dietary restriction and occurrence of *** with HFI who adhere strictly to FSS free diet have an excellent prognosis with a normal *** review attempts to increase awareness and provide a comprehensive review of this rare but treatable disorder.

关键词： Hereditary Fructose Intolerance Children Liver Steatohepatitis Aldolase

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Neuroprotective Effect of Chrysophanol as a PI3K/AKT/mTOR Signaling Inhibitor in an Experimental Model of Autologous Blood-induced Intracerebral Hemorrhage

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Current Medical Science 2022年第2期42卷 249-266页

作者： Kuldeep Singh JADAUN Sidharth MEHAN Aarti SHARMA Ehraz Mehmood SIDDIQUI sumit kumar NaifALSUHAYMI Neuropharmacology Division Department of PharmacologyISF College of PharmacyMogaPunjab142001India Department of Emergency Medical Services Faculty of Health Sciences-AlQunfudahUmm Al-Qura UniversityMekkahSaudi Arabia

Objective Intracerebral hemorrhage(ICH)refers to predominant,sporadic,and non-traumatic bleeding in the brain *** PI3K/AKT/mTOR signaling pathway is an important signal transduction pathway regulated by enzyme-linked receptors and has many biological functions in *** plays a key role in neuronal metabolism,gene expression regulation,and tissue homeostasis in the healthy and diseased *** In the present study,the role of the PI3K/AKT/mTOR pathway inhibitor chrysophanol(CPH)(10 mg/kg and 20 mg/kg,orally)in the improvement of ICH-associated neurological defects in rats was *** blood(20µL/5 min/unilateral/intracerebroventricular)mimics ICH-like defects involving cellular and molecular dysfunction and neurotransmitter *** current study also included various behavioral assessments to examine cognition,memory,and motor and neuromuscular *** protein expression levels of PI3K,AKT,and mTOR as well as myelin basic protein and apoptotic markers,such as Bax,Bcl-2,and caspase-3,were examined using ELISA ***,the levels of various neuroinflammatory cytokines and oxidative stress markers were ***,the neurological severity score,brain water content,gross brain pathology,and hematoma size were used to indicate neurological function and brain *** CPH was found to be neuroprotective by restoring neurobehavioral alterations and significantly reducing the elevated PI3K,AKT,and mTOR protein levels,and modulating the apoptotic markers such as Bax,Bcl-2,and caspase-3 in rat brain *** substantially reduced the inflammatory cytokines like interleukin(IL)-1β,IL-6,and tumor necrosis factor-α.CPH administration restored the neurotransmitters GABA,glutamate,acetylcholine,dopamine,and various oxidative stress *** Our results show that CPH may be a promising therapeutic approach for overcoming neuronal damage caused by the overexpression of the PI3K/AKT/mTOR signal

关键词： intracerebral hemorrhage autologous blood PI3K/AKT/mTOR hematoma chrysophanol apoptosis neurotransmitter neuroinflammation

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Adaptive Linear Quadratic Regulator for Continuous-Time Systems With Uncertain Dynamics

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IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 833-841页

作者： sumit kumar Jha Shubhendu Bhasin IEEE Department of Electronics and Communication Engineering Motilal Nehru National Institute of Technology AllahabadPrayagraj-211004India Department of Electrical Engineering Indian Institute of Technology DelhiNew Delhi-110016India

In this paper, adaptive linear quadratic regulator(LQR) is proposed for continuous-time systems with uncertain dynamics. The dynamic state-feedback controller uses inputoutput data along the system trajectory to continuously adapt and converge to the optimal controller. The result differs from previous results in that the adaptive optimal controller is designed without the knowledge of the system dynamics and an initial stabilizing policy. Further, the controller is updated continuously using input-output data, as opposed to the commonly used switched/intermittent updates which can potentially lead to stability issues. An online state derivative estimator facilitates the design of a model-free controller. Gradient-based update laws are developed for online estimation of the optimal gain. Uniform exponential stability of the closed-loop system is established using the Lyapunov-based analysis, and a simulation example is provided to validate the theoretical contribution.

关键词： Adaptive optimal control continuous policy update linear quadratic regulator uncertain system dynamics

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Airfoil Shape Optimisation Using a Multi-Fidelity Surrogate-Assisted Metaheuristic with a New Multi-Objective Infill Sampling Technique

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2111-2128页

作者： Cho Mar Aye Kittinan Wansaseub sumit kumar Ghanshyam G.Tejani Sujin Bureerat Ali R.Yildiz Nantiwat Pholdee Sustainable and Infrastructure Research and Development Center Department of Mechanical EngineeringFaculty of EngineeringKhon Kaen UniversityKhon Kaen40002Thailand Department of Mechanical Engineering Faculty of EngineeringMahasarakham UniversityMahasarakham44150Thailand Australian Maritime College College of Science and EngineeringUniversity of TasmaniaLaunceston7248Australia Department of Mechanical Engineering School of TechnologyGSFC UniversityVadodaraGujarat391750India Department of Mechanical Engineering Bursa Uludag UniversityBursa16059Türkiye

This work presents multi-fidelity multi-objective infill-sampling surrogate-assisted optimization for airfoil shape *** optimization problem is posed to maximize the lift and drag coefficient ratio subject to airfoil geometry *** Fluid Dynamic(CFD)and XFoil tools are used for high and low-fidelity simulations of the airfoil to find the real objective function value.A special multi-objective sub-optimization problem is proposed for multiple points infill sampling exploration to improve the surrogate model *** validate and further assess the proposed methods,a conventional surrogate-assisted optimization method and an infill sampling surrogate-assisted optimization criterion are applied with multi-fidelity simulation,while their numerical performance is *** results obtained show that the proposed technique is the best performer for the demonstrated airfoil shape *** to this study,applying multi-fidelity with multi-objective infill sampling criteria for surrogate-assisted optimization is a powerful design tool.

关键词： Multi-fidelity modelling differential evolution kriging infill sampling criteria metaheuristics

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INFLUENCE OF RIGID BOUNDARY ON THE LOVE WAVE PROPAGATION IN ELASTIC LAYER WITH VOID PORES

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Acta Mechanica Solida Sinica 2013年第5期26卷 551-558页

作者： sumit kumar Vishwakarma Shishir Gupta Dinesh kumar Majhi Department of Applied Mathematics Indian School of Mines Department of Mathematics Birla Institute of Technology and Science

In this paper, a mathematical model for Love wave propagation in a porous elastic layer under a rigid boundary resting over a poro-elastic half-space has been developed. The study shows that such a medium transmits two types of Love waves. The first front depends on the change in volume fraction of the pores whereas the second front depends upon the modulus of rigidity of the elastic matrix of the medium and is the same as the Love wave in an elastic layer over an elastic half-space. It is observed that the first front is many times faster than the shear wave in the medium with void pores due to the change in the volume fraction of the pores and is significant.

关键词： Love waves void pores volume fraction rigid boundary wave front

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