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Impedance and ferroelectric properties of sr^(2+) modified PZT-PMN ceramics

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International Journal of Minerals,Metallurgy and Materials 2014年第6期21卷 595-603页

作者： Arvind kumar s.k.mishra Research and Technology Development Centre Sharda University Dr. Harisingh Gour University

sr^2＋ modified polycrystalline PZT-PMN ceramics were synthesized by a semi-wet route. Impedance spectroscopy studies indicate the bulk and grain boundary effects of PZT-PMN material along with the negative temperature coefficient of resistance. The bulk conductiv-ity exhibits an Arrhenius-type thermally activated hopping process which is supported by the AC conductivity behavior as a function of fre-quency and temperature. It is observed that the remnant polarization increases with an increase in the sr2＋content in PZT-PMN.

关键词： piezoelectric ceramics ferroelectric materials ferroelectricity electrochemical properties strontium

A critical fault detection analysis & fault time in a UPFC transmission line

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Protection and Control of Modern Power systems 2019年第1期4卷 24-33页

作者： s.k.mishra L.N.Tripathy school of EE Research ScholarKIIT UniversityBhubaneswar751024India Department of EE C.E.TBhubaneswarOdishaIndia

This paper discusses a critical study of fault detection and fault time analysis in a Unified Power Flow Controller (UPFC) transmission line. Here the Discrete Wavelet Transform (DWT) and Discrete Fourier Transform (DFT) approach are used for processing the faulty current signal to obtain fundamental current signal. The extracted fault current signals from the current transformer are fed to DWT and DFT approach for computing spectral energy (sE). The differential spectral energy (DsE) of phase currents are evaluated by taking the difference of sE obtained at sending and receiving end. The DsE is the key factor for deciding the fault in any of the phase or not. The Daubechy mother wavelet (db4) is used here because of its high accuracy of detection with less processing time. The novelty of the scheme is that it can accurately detect the critical fault variation of the line. Number of simulations are validated at the extreme condition of the line and compared to other conventional existing scheme. Multi-phase fault in double circuit line, CT saturation, UPFC operating condition (series voltage and angle), UPFC location and wind speed variation including wind farm simulation are validated to verify the performance of the scheme. The advantages of the scheme is that it works effectively to detect the fault at any stage of critical condition of the line and fault detection time remains within 20 msec (less than one cycle period). This scheme protects both internal and external zone including parameter variation of the line.

关键词： DsE Fault detection UPFC Threshold Fault time

Thermally stimulated properties in Znse：Tb and Znse：(Mn, Tb) phosphors

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Journal of semiconductors 2018年第2期39卷 13-16页

作者： A.k.mishra s.k.mishra s.P.Pandey kshama Lakshmi mishra sHEAT College of Engineerig Varansi (U.P.) India Army Public school kunraghat Gorakhpur (U.P.) India Department of Physics MM University Ambala Haryana India shree Thakurdwara Balika Vidyalaya Ghaziabad (U.P.) India

Thermoluminescence studies were performed of Znse：Tb and Znse：（Mn, Tb） phosphors. A method of preparation for Znse phosphors doped with Tb and（Mn, Tb） has been discussed. The thermoluminescence（TL）properties of these phosphors have been studied from 100 to 370 k temperature after exciting by UV radiation（365 nm）at three uniform heating rates 0.4, 0.6 and 0.9 k/s. The trapping parameters like trap depth, lifetime of electrons and capture cross-section have also been determined using various methods.

关键词： thermoluminescence electroluminescence capture cross-section ionizing radiation phosphors Curie's method

Tandem rapid manufacturing of Inconel-625 using laser assisted and plasma transferred arc depositions

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Advances in Manufacturing 2013年第4期1卷 305-313页

作者： P.Bhargava C.P.Paul C.H.Premsingh s.k.mishra Atul kumar D.C.Nagpure Gurvinderjit singh L.M.kukreja Laser Material Processing Division Raja Ramanna Centre for Advanced Technology Laser Materials Development and Devices Division Raja Ramanna Centre for Advanced Technology

This paper presents an investigation on depo- sition of Inconel-625 using laser rapid manufacturing （LRM） and plasma transferred arc （PTA） deposition in individual and tandem mode. LRM has advantages in terms of dimensional accuracy, improved mechanical properties, finer process control, reduced heat input and lower thermal distortion, while PTA scores more in terms of lower initial investment, lower running cost and higher deposition rate. To quantify the clubbed advantages and limitations of both processes, these were studied individually and in tandem. A number of samples were deposited at different process parameters like power, scan speed, powder feed rate. They were subjected to tensile test, adhesion-cohesion test, impact test and micro hardness measurement. The results of individual tests showed the comparable mechanical prop- erties with i20% variation. The mixed dendritic-cellular and dendritic-columnar microstructures were respectively observed for LRM and PTA deposits with a distinct inter- face for the case of tandem deposition. The interface strength of tandem deposits was evaluated employing adhesion-cohesion test, and it was found to be （325 i 35） MPa. The study confirmed the viability of LRM and PTA deposition in tandem for hybrid manufacturing.

关键词： Tandem rapid manufacturing - Laserrapid manufacturing (LRM) ~ Plasma transferred arc(PTA) deposition ~ Inconel-625

新南威尔士煤层产出镜煤在无机电介质存在下的界面动电性质

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国外金属矿选矿 1981年第3期 35-36页

作者： s.k.mishra 李新才

浮选法作为提高细粒煤的品位是有效的,但煤粒表面氧化和粘土矿泥对浮选带来了不良影响,要解决这个问题,同时又要求获得最好的浮选结果,寻求关于浮选过程中适当的电解质的有关条件,进行煤粒的表面化学性质的研究是必要的。在本研究中,采... 详细信息

浮选法作为提高细粒煤的品位是有效的,但煤粒表面氧化和粘土矿泥对浮选带来了不良影响,要解决这个问题,同时又要求获得最好的浮选结果,寻求关于浮选过程中适当的电解质的有关条件,进行煤粒的表面化学性质的研究是必要的。在本研究中,采用了具有比较均匀的、更明了的化学结构的镜煤。

关键词：镜煤等电点电介质介质材料煤层地层

Machine learning-enhanced Monte Carlo and subset simulations for advanced risk assessment in transportation infrastructure

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Journal of Mountain science 2024年第2期21卷 690-717页

作者： Furquan AHMAD Pijush sAMUI s.s.mishra Department of Civil Engineering National Institute of TechnologyPatna 800006India

The maintenance of safety and dependability in rail and road embankments is of utmost importance in order to facilitate the smooth operation of transportation *** study introduces a comprehensive methodology for soil slope stability evaluation,employing Monte Carlo simulation(MCs)and subset simulation(ss)with the"UPss 3.0 Add-in"in *** on an 11.693-meter embankment with a soil slope(inclination ratio of 2H:1V),the investigation considers earthquake coefficients(kh)and pore water pressure ratios(ru)following Indian zoning *** chance of slope failure showed a considerable increase as the Coefficient of Variation(COV),seismic coefficients(kh),and pore water pressure ratios(ru)experienced an *** ss approach showed exceptional efficacy in calculating odds of failure that are notably *** computational modeling,the study optimized the worst-case scenario using ANFIs-GA,ANFIs-GWO,ANFIs-PsO,and ANFIs-BBO *** ANFIs-PsO model exhibits exceptional accuracy(training R2=0.9011,RMsE=0.0549;testing R2=0.8968,RMsE=0.0615),emerging as the most *** study highlights the significance of conducting thorough risk assessments and offers practical insights into evaluating and improving the stability of soil slopes in transportation *** findings contribute to the enhancement of safety and reliability in real-world situations.

关键词： Monte Carlo simulation subset simulation Machine Learning seismic coefficient

Performance and combustion study of a low heat rejection engine running with biogas–diethyl ether–diesel

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Waste Disposal and sustainable Energy 2024年第1期6卷 151-162页

作者： sanjaya k.mishra Premananda Pradhan shakti P.Jena Department of Mechanical Engineering S‘O’A Deemed to be UniversityBhubaneswar751030India

The present research focuses on addressing the faster depletion of fossil fuels and environmental pollution in addition to the energy crisis that hinders the progress of a *** the current research,waste banana leaves were considered as substrates for biogas *** is taken as the primary fuel in dual fuel(DF)operations to maximize possible diesel *** performance and combustion assessment were executed in a low heat rejection(LHR)engine using 5%diethyl ether by volume blended with diesel(5DEE)as pilot *** combustion attributes of the engine reveal that the apex of net heat release rate(NHRR)curve retarded a bit as compared to apex of base *** peak cylinder pressure was noted to be 6.19 MPa in the LHR engine running with 5DEE+biogas at 11.7°crank angle(CA)after top dead center(aTDC)compared to 5.23 MPa for the diesel alone operation at the same *** apex point for NHRR was observed to be 54.51 J(°)^(−1)for 5DEE+biogas in LHR engine positioned at 3.2°*** brake thermal efficiency at full engine load operation decreased by 12.7%and 5.2%for biogas substitutions of 0.8 kg h^(−1)with diesel and 5DEE,respectively,compared to the base *** smoke opacity and nitric oxide emissions were reduced during the DF run accompanied by diethyl ether as a fuel additive.

关键词： Biogas Banana leaves Coating Diesel engine Diethyl ether Exhaust emissions

Embryonic thermal manipulation:a potential strategy to mitigate heat stress in broiler chickens for sustainable poultry production

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Journal of Animal science and Biotechnology 2024年第4期15卷 1347-1375页

作者： sadid Al Amaz Birendra mishra Department of Human Nutrition Food and Animal SciencesCollege of Tropical Agriculture and Human ResourcesUniversity of Hawaii at ManoaAgSci 2161955 East‑West RdHonoluluHI 96822USA

Due to high environmental temperatures and climate change, heat stress is a severe concern for poultry health and production, increasing the propensity for food insecurity. With climate change causing higher temperatures and erratic weather patterns in recent years, poultry are increasingly vulnerable to this environmental stressor. To mitigate heat stress, nutritional, genetic, and managerial strategies have been implemented with some success. However, these strategies did not adequately and sustainably reduce the heat stress. Therefore, it is crucial to take proactive measures to mitigate the effects of heat stress on poultry, ensuring optimal production and promoting poultry well-being. Embryonic thermal manipulation(TM) involves manipulating the embryonic environment's temperature to enhance broilers' thermotolerance and growth performance. One of the most significant benefits of this approach is its cost-effectiveness and saving time associated with traditional management practices. Given its numerous advantages, embryonic TM is a promising strategy for enhancing broiler production and profitability in the poultry industry. TM increases the standard incubation temperature in the mid or late embryonic stage to induce epigenetic thermal adaption and embryonic metabolism. Therefore, this review aims to summarize the available literature and scientific evidence of the beneficial effect of pre-hatch thermal manipulation on broiler health and performance.

关键词： Broiler Embryo Epigenetics Global warming Thermoregulation

Collective wetting transitions of submerged gas-entrapping microtextured surfaces

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Droplet 2024年第3期3卷 102-106页

作者： sankara Arunachalam Himanshu mishra Environmental science and Engineering Program Biological and Environmental Sciences and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia Water Desalination and Reuse Center King Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia

Numerous natural and industrial processes entail the spontaneous entrapment of gas/air as rough/patterned surfaces are submerged under *** the wetting transitions ensue,the gas diffuses into the water leading to the fully water-filled ***,the standard models forwetting do not accountfor the microtexture’s topography on collective wetting *** other words,it is not clear whether the lifetime of n cavities arranged in a one-dimensional(I-D)line or a two-dimensional(II-D)(circular or square)lattice would be the same or not as a single 0-D *** response,we tracked the time-dependentfates of gas pockets trapped in I-D and II-D lattices and compared them with wetting transitions in commensurate 0-D ***,the collective wetting transitions in the I-D and the II-D arrays had a directionality such thatthe gas from the outermost cavities was lostthe first,while the innermost gotfilled by water the *** essence,microtexture’s spatial organization afforded shielding to the loss of the gas from the innermost cavities,which we probed as a function of the microtexture’s pitch,surface density,dimensionality,and hydrostatic *** findings advance our knowledge of wetting transitions in microtextures and inspiring surface textures to protect electronic devices against liquid ingression.

关键词： topography transitions submerged