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Abrasive Wear characteristics of carbon and Low Alloy Steels for Better Performance of Farm Implements

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Journal of Materials Science & Technology 1995年第2期11卷 91-96页

作者： M.Kumar and r. c gupta(centre of Advanced Study, Dept. of Metallurgical Engineering, Institute of Technology,Banaras Hindu University, Vaanasi -221 005, India) Banaraz Hindu Univ Varanasi India

The low stress abrasion behaviours of heat treated mild, medium carbon and high c - low cr steels, which are generally used in making farm implements, have been investigated. The simple heat treatment greatly improves the hardness, tensile strength and abrasion resistance of medium carbon and high c - low cr steels. The results indicate that the material removal during abrasion is controlled by a number of factors, such as hardness, chemical composition, microstructure and heat treatment conditions. The conclusion is that the heat treated high c - low cr steel and mild steel carburized by using coaltar pitch provide the best hardness and abrasion resistance and thus appear to be the most suitable materials for making agricultural tools.

关键词： Abrasive Wear characteristics of carbon and Low Alloy Steels for Better Performance of Farm Implements MPa

Spatio-temporal variability in microfossil and geochemical records of cenomanian-Turonian oceanic anoxic event-2: a review

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Journal of Palaeogeography 2024年第4期13卷 646-674页

作者： c.P.Sooraj Shweta gupta Jahnavi Punekar Department of Earth Sciences Indian Institute of Technology Bombay

The cenomanian-Turonian boundary oceanic anoxic event(OAE-2; Bonarelli event; ～94 Ma) is associated with a species turnover in the marine calcareous microfossil record, widespread marine anoxia,black shale deposition and positive δ13c excursions. This study reviews 141 cTBE sites globally, aiming to understand micropaleontological, geochemical, and sedimentological expressions of OAE-2. There is a clear palaeogeographic and palaeobathymetric heterogeneity in the development of OAE-2 marine anoxia. A majority of the documented OAE-2 sites are from deep marine environments. The calcareous nannoplankton and benthic foraminifera record a diversity decline, while planktic foraminifera shows community level shifts and no major mass extinction. The variability of total organic carbon in OAE-2 sediments across sites(10 wt.%) and the δ13c profiles(diachronous) have been attributed to different mechanisms of anoxia *** increased primary “productivity model” gains support from productivity proxies(e.g., Ba, P, cu, Ni),redox-sensitive elements(e.g., Mn, Mo, U, V, As), and eutrophic genera(e.g., benthic foraminifera Gabonita spp., calcareous nannofossils Biscutum spp. and Zeugrhabdotus erectus). The enhanced organic carbon“preservation model” in stratified(semi) restricted basins gains support from sites with lower enrichment of redox-sensitive elements and oligotrophic flora and fauna in the OAE-2 records. Geochronology of the caribbean and the High Atlantic Large Igneous Province events(cLIP and HALIP) mark them as likely triggers of the OAE-2 related global perturbation of marine biogeochemistry. Volcanic triggers may have caused climate warming, altered hydrological cycles, enhanced continental weathering, shifts in ocean circulation, and nutrient flows. Addressing knowledge gaps, further research is urged, utilizing innovative proxies, and exploring underrepresented depositional systems to comprehensively understand OAE-2 onset and biotic crisis.

关键词： Oceanic anoxic Event-2 Global organic carbon distribution Geochemical proxies Marine calcifiers Palaeoceanography

Improving Heat Transfer in Parabolic Trough Solar collectors by Magnetic Nanofluids

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Energy Engineering 2024年第4期121卷 835-848页

作者： ritesh Singh Abhishek gupta Akshoy ranjan Paul Bireswar Paul Suvash c.Saha Department of Applied Mechanics Motilal Nehru National Institute of Technology AllahabadPrayagrajIndia Department of Mechanical and Mechatronic Engineering University of Technology SydneySydneyAustralia

A parabolic trough solar collector(PTSc)converts solar radiation into thermal ***,low thermal efficiency of PTSc poses a hindrance to the deployment of solar thermal power *** performance of PTSc is enhanced in this study by incorporating magnetic nanoparticles into the working *** circular receiver pipe,with dimensions of 66 mm diameter,2 mm thickness,and 24 m length,is exposed to uniform temperature and velocity *** working fluid,Therminol-66,is supplemented with Fe3O4 magnetic nanoparticles at concentrations ranging from 1%to 4%.The findings demonstrate that the inclusion of nanoparticles increases the convective heat transfer coefficient(HTc)of the PTSc,with higher nanoparticle volume fractions leading to greater heat transfer but increased pressure *** thermal enhancement factor(TEF)of the PTSc is positively affected by the volume fraction of nanoparticles,both with and without a magnetic ***,the scenario with a 4%nanoparticle volume fraction and a magnetic field strength of 250 G exhibits the highest TEF,indicating superior thermal *** findings offer potential avenues for improving the efficiency of PTScs in solar thermal plants by introducing magnetic nanoparticles into the working fluid.

关键词： Parabolic trough solar collector(PTSc) magnetic nanofluid(MNF) heat transfer convective heat transfer coefficient(HTc) thermal enhancement factor(TEF)

Boron neutron capture therapy of cancer:where do we stand now?

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cancer communications 2024年第8期44卷 889-892页

作者： rolf F.Barth Gong Wu Maria da Graca H.Vicente John c Grecula Nilendu gupta Department of Pathology The Ohio State UniversityColumbusOhioUSA Mass Spectrometry and Proteomics Facility The Ohio State UniversityColumbusOhioUSA Department of chemistry Louisiana State UniversityBaton RougeLouisianaUSA Department of radiation Oncology The Ohio State UniversityColumbusOhioUSA

1 INTrODUcTION,This is the third Editorial/commentary that one of us(***)has written relating to boron neutron capture therapy(BNcT)[1,2].For those readers who are unfamiliar with BNcT we would refer them to several recent comprehensive reviews[3–5].The second Editorial ended on a hopeful note that with the introduction of acceleratorbased neutron sources(ABNSs),BNcT would enter into the mainstream of radiation therapy[2].

关键词： boron 1,2 neutron

Energy-growth nexus for‘renewable Energy country Attractiveness Index’countries:Evidence from new econometric methods

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Geoscience Frontiers 2024年第3期15卷 298-311页

作者： Mandeep Mahendru Aviral Kumar Tiwari Gagan Deep Sharma Solomon Nathaniel Mansi gupta Szechenyi Istvan University GyorHungary Indian Institute of Management BodhgayaIndia University School of Management Studies Guru Gobind Singh Indraprastha UniversitySector 16 CDwarkaNew DelhiIndia Department of Economics University of LagosAkokaNigeria centre for Financial Innovation S P Jain Institute of Management and ResearchMumbaiIndia

This study explores the connections between renewable energy consumption(rEc),non-renewable energy consumption(NrEc),gross fixed capital formation(GFcF),the labor force(LF),and economic growth(GDP)in renewable Energy country Attractiveness Index(rEcAI)countries for *** quantify the nexus between rEc,NrEc,and GDP while utilizing a production model framework and including the measures of labor and capital,for suggesting a phase-wise strategy to attain the sustainable development *** use robust methodologies including Lagrange Multiplier(LM)panel unit root tests with trend shifts,Westerlund cointegration test,LM bootstrap technique for cointegration with breaks,continuously updated fully modified(cUP-FM)and continuously updated bias-corrected(cUPBc)estimators,Augmented Mean Group(AMG)approach,fully modified ordinary least squares,dynamic ordinary least squares,canonical cointegrating regression(ccr),and panel causality test proposed by canning&*** compute non-parametric time-varying coefficients with fixed effects for seeing the impact of GFcF,LF,rEc,and NrEc on *** results press upon policymakers to shift toward clean energy and rEc for attaining the environmental goals(SDGs 6,7,13,and 15)and the economic goals(SDGs 1,2,8,and 10).While this shift would help developed economies,which have already attained the economic goals,to progress on the front of environmental goals,it would enable developing countries to progress on both fronts in a balanced manner.

关键词： renewable energy consumption Economic growth Non-renewable energy consumption cUP-Bc cUP-FM Time-varying coefficients with fixed effects

The diagnostic conundrum in necrotizing otitis externa

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2024年第1期10卷 59-65页

作者： Abiya A.Ahmed Shaan rashid Vinay K.gupta Neil c.Molony Keshav K.gupta Bradford royal Infirmary Bradford Teaching Hospitals NHS Foundation TrustWest BromwichWest YorkshireUK Sandwell and West Birmingham Hospitals NHS Trust West BromwichUK russells Hall Hospital DudleyUK

Necrotizing otitis externa(NOE)is an aggressive and fast‐evolving infection of the external auditory *** diagnoses and untreated cases can lead to severe,even fatal consequences and so early diagnosis and treatment are *** is a notoriously challenging diagnosis to *** is therefore important to understand what diagnostic modalities are available and how otolaryngologists can use them to accurately treat such an aggressive *** review aims to evaluate the different diagnostic options available in NOE and discuss their advantages and limitations,thus,providing an up‐to‐date picture of the multimodal approach required in the diagnosis of this disease.

关键词： diagnostic malignant otitis externa necrotizing osteomyelitis skull base osteomyelitis temporal bone osteomyelitis

Methyl-salicylate:A surveillance system fortriggering immunity in neighboring plants

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Journal of Integrative Plant Biology 2024年第2期66卷 163-165页

作者： Saumya Jaiswal Durgesh Kumar Tripathi ravi gupta JingHe Zhong-Hua chen Vijay Pratap Singh Plant Physiology Laboratory Department of Botany C.M.P.Degree CollegeA Constituent Post Graduate College ofUniversity of AllahabadPrayagraj 211002India crop Nanobiology and Molecular Stress Physiology LabAmity Institute of Organic Agriculture Amity University UttarPradeshNoida 201313India college of General Education Kookmin UniversitySeoul 02707South Korea School of Science Western Sydney UniversitySydney 2751New South WalesAustralia Hawkesbury Institute for the Environment Western SydneyUniversitySydney 2751New South WalesAustralia

Plant behavioral actions have been one of the major topicsof research in plant biology and *** actionsfrom plants are determined by their instant structural andphysical reactions to the circumstances(Bouwmeester et al.,2019).Upon sensing abiotic factors such as salinity,flooding,high temperature,drought,plants make suitable changes intheir physiology and behavior to survive such harsh conditions.

关键词： immunity neighboring salinity

Graphene derivatives as efficient hole transport materials for lead-free double perovskite(csSnI) solar cells: a numerical study

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Optoelectronics Letters 2024年

作者： SArITA YADAV SArAL K gupta c.M.S.NEGI Department of Physical Science，Banasthali Vidyapith

The double perovskite cs2SnI6has notable optical and electrical characteristics， rendering it a highly prospective candidate for deployment as the absorber layer in perovskite solar cells (PScs). We simulated the performance of PScs using lead-free cs2SnI6double perovskite absorber layer and graphene derivatives， namely graphene oxide (GO) and reduced graphene oxide (rGO)， as hole transport layers (HTLs). Our findings show that rGO offers an excellent hole extraction property with minimal interfacial recombination compared to GO. PSc utilizing rGO as the HTL material achieved a power conversion efficiency of 19.07%， while those employing GO HTL attained only 16.9%. The superior performance of rGO is attributed to its greater charge carrier mobility of rGO and its favorable energy level alignment with the double perovskite absorber layer. In contrast， the mismatch in the charge transport properties between the absorber layer and the GO HTL resulted in poor performance. Our study showcases the potential of using graphene derivative-based HTLs for realizing lead-free PScs.

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Molecular mechanisms of aflatoxin neurotoxicity and potential neuroprotective agents

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Food Science and Human Wellness 2024年第5期13卷 2445-2455页

作者： chongshan Dai Erjie Tian Hui Li Subhajit Das gupta Zhihui Hao Zhanhui Wang Tony Velkov Jianzhong Shen National Key Laboratory of Veterinary Public Health and Safety Beijing Key Laboratory of Detection Technology for Animal-Derived Food SafetyCollege of Veterinary MedicineChina Agricultural UniversityBeijing 100193China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China college of Animal Science and Technology Henan University of Science and TechnologyLuoyang 471023China Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning Beijing Center for Disease Prevention and ControlBeijing 100013China Department of Internal Medicine University of Texas Southwestern Medical CenterDallas 75230USA Monash Biomedicine Discovery Institute Department of PharmacologyMonash UniversityVictoria 3800Australia

Aflatoxins(AFTs)represent one of the most notorious classes of deadly mycotoxins produced by certain fungi that are found on agricultural *** are highly toxic to mammals and are known to cause a series of detrimental effects,including neuro-,hepato-,nephron-,and *** this original review we summarize the mechanisms of aflatoxin-induced neurotoxicity and the clinical potential of novel neuroprotective *** B1(AFB1)is the most toxic congener among the 21 identified *** studies have shown that food borne exposure to AFB1 and/or its metabolites often leads to fatal neurotoxicity in animals and *** studies indicated that AFB1 exposure could induce abnormal behavioral changes,including anxiety,lethargy disorders,depression-like behavior,cognitive,learning and memory defects,and decreased feeding ***,AFB1 exposure has been associated with lipid peroxidation,ablation of non-enzymatic and enzymatic antioxidant defense systems and decreased neurotransmitter ***1 exposure has also been shown to induce DNA damage,apoptosis,pyroptosis,and mitochondrial dysfunction in the brain *** signaling pathways,including gasdermin D,toll like receptor 2(TLr2),TLr4,Akt,NF-κB,ErK/MAPK,protein kinase c(PKc),and mitochondrial apoptotic pathways have been shown to participate in AFB1-induced neuronal or astrocyte cell *** these pathways by small molecules(e.g.,quercetin,curcumin,and gallic acid,and dimethyl fumarate),chinese herbal extracts(e.g.,Artichoke leaf extract,chelidonium majus ethanolic extract,pumpkin extract,and crocus sativus ***),and probiotic supplements could effectively improve AFB1-induced neurobehavioral abnormalities and *** date,the precise molecular mechanisms of AFB1-induced neurotoxicity and potential neuroprotective agents remain *** the present review,the clinical manifestations,molecular mechanisms,and potential neuroprotective agents of AFB1

关键词： Aflatoxin B1(AFB1) Neurotoxicity Molecular mechanisms chemical preventions