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Nonlinear dynamics and performance analysis of modified snap-through vibration energy harvester with time-varying potential function

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Applied Mathematics and Mechanics(English Edition) 2022年第2期43卷 185-202页

作者： k.DEVARAJAN b.SANTHOSH Department of Mechanical Engineering Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatore641112India

Vibration energy harvesting has emerged as a promising method to harvest energy for small-scale *** the performance of a vibration energy harvester(VEH)incorporating nonlinear techniques,for example,the snap-through VEH with geometric non-linearity,has gained attention in recent years.A conventional snap-through VEH is a bi-stable system with a time-invariant potential function,which was investigated extensively in the *** this work,a modified snap-through VEH with a time-varying potential function subject to harmonic and random base excitations is *** snap-through VEHs,such as the one considered in this study,are used in wave energy ***,the studies on their dynamics and energy harvesting under harmonic and random excitations are *** dynamics of the modified snap-through VEH is represented by a system of differential algebraic equations(DAEs),and the numerical schemes are proposed for its *** a harmonic excitation,the system exhibits periodic and chaotic motions,and the energy harvesting is superior compared with the conventional *** dynamics under a random excitation is investigated by the moment differential method and the numerical scheme based on the modified Euler-Maruyama *** Fokker-Planck equation representing the dynamics is derived,and the marginal and joint probability density functions(PDFs)are obtained by the Monte Carlo *** study shows that the modified snap-through oscillator based VEH performs better under both harmonic and random *** dynamics of the system under stochastic resonance(SR)is investigated,and performance enhancement is *** results from this study will help in the development of adaptive VEH techniques in the future.

关键词： snap-through vibration energy harvester(VEH) time-varying potential function bifurcation probability density function(PDF) Fokker-Planck equation

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Nitrous Oxide Emissions from Fields with Different Wheat and Rice Varieties

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Pedosphere 2012年第1期22卷 112-121页

作者： b.GOGOI k.k.bARUAH Department of Environmental Science Tezpur University

Plant species of cropping systems may affect nitrous oxide （N2O） emissions. A field experiment was conducted to investigate dynamics of N2O emissions from rice-wheat fields from December 2006 to June 2007 and the relationships of soil and plant parameters with N2O emissions. The results indicated that N2O emissions from different wheat varieties ranged front 12 to 291 Ixg N2O-N m-2 h 1 and seasonal N2O emissions ranged from 312 to 385 mg N2O-N m -2 In the rice season, it was from 11 to 154 μg N2O-N m-2 h-1 with seasonal N2O emission of 190-216 mg N2O-N m-2. The seasonal integrated flux of N2O differed significantly among wheat and rice varieties showed higher seasonal N2O emissions. In the wheat season, N2O The wheat variety HUW 234 and rice variety Joymoti emissions correlated with soil organic carbon （SOC）, soil NO3-N, soil temperature, shoot dry weight, and root dry weight. Among the variables assessed, soil temperature followed by SOC and soil NO3-N were considered as the important variables influencing N2O emission. N2O emission in the rice season was significantly correlated with SOC, soil NO3-N, soil temperature, leaf area, shoot dry weight, and root dry weight. The main driving forces influencing N2O emission in the rice season were soil NO3-N, leaf area, and SOC.

关键词： nitrous oxide flux plant characteristics rice field soil factors wheat field

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Structure modification and recovery of amorphous Fe_(73.5)Si_(13.5)b_9Nb_3Cu_1 magnetic ribbons after autoclave treatment:SAXS and thermodynamic analysis

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Journal of Materials Science & Technology 2019年第1期35卷 118-126页

作者： L.Y.Guo X.Wang k.C.Shen k.b.kim S.Lan X.L.Wang W.M.Wang key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Department of Nanotechnology and Advanced Materials Engineering Sejong University Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Department of Physics City University of Hong Kong

The structure, crystallization kinetics and magnetic property of as-quenched Fe_(73.5)Si_(13.5)b_9Nb_3Cu_1 amorphous ribbon(R0) as well as ribbons after autoclave treatment at 100°C and 150°C(R1 and R2) have been systematically studied by various techniques. With increasing autoclave treatment temperature,the measured structural, kinetic and magnetic parameters of samples increase firstly, i.e. R0 by transforming from fcc to bcc structure during the autoclave treatment and that the autoclave treatment can decrease the large radius(r_M) MRO(medium range order),but increase the small rMMRO. The measured structural, thermal and magnetic parameters of R2 sample have a tendency to recover toward as-quenched R0 sample. The thermal and magnetic parameters of samples after solely annealing treatment at higher temperature have no obvious recover *** uneven actions of pressure and temperature in autoclave treatment may be helpful for us to search a new method to improve the magnetic properties of Fe-based glasses.

关键词： SAXS (small-angle X-ray scattering) Fe-based glass Thermodynamic Magnetic ribbon DSC (differential scanning calorimetry)

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Upgradation of bauxite by molecular hydrogen and hydrogen plasma

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International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1141-1149页

作者： b.R.Parhi S.k.Sahoo S.C.Mishra b.bhoi R.k.Paramguru b.k.Satapathy Department of Metallurgical and Materials Engineering National Institute of Technology Rourkela 769008 Odisha India Institute of Minerals and Materials Technology Bhubaneswar 751013 Odisha India kalinga Institute of Industrial Technology Bhubaneswar 751024 Odisha India National Aluminium Company Ltd. Bhubaneswar 751013 Odisha India

An approach was developed to upgrade the bauxite ore by molecular hydrogen and hydrogen plasma. A gibbsite-type bauxite sample was obtained from National Aluminium Company（NALCO）, Odisha, India. The obtained sample was crushed and sieved（to 100 μm） prior to the chemical analysis and grain-size distribution study. The bauxite sample was calcined in the temperature range from 500 to 700°C for different time intervals to optimize the conditions for maximum moisture removal. This process was followed by the reduction of the calcined ore by molecular hydrogen and hydrogen plasma. Extraction of alumina from the reduced ore was carried out via acid leaching in chloride media for 2 h at 60°C. X-ray diffraction, scanning electron microscopy, thermogravimetry in conjunction with differential scanning calorimetry, and Fourier transform infrared spectroscopy were used to determine the physicochemical characteristics of the material before and after extraction. Alumina extracted from the reduced ore at the optimum calcination temperature of 700°C and the optimum calcination time of 4 h is found to be 90% pure.

关键词： upgrading bauxite calcination leaching alumina extraction

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丁（月先）肼（b9）对蓖麻的雄雌花表现和结籽的影响

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中国油料作物学报 1988年第3期 97-98页

作者： S.V.S Chauhan,b.k Saxena,木下俊郎,戎新祥印度R.b.S学院植物系印度R.b.S学院植物系札幌市北海道大学农学系

丁酰肼,学名丁二酸2,2二甲基酸肼。人们常称的丁酰肼或SADH(b9或b995)是一种最广泛地用于植物的生长调节剂。本试验用了（月先）肼处理蓖麻,观察其对蓖麻雌、雄花影响、花粉不育性、果实和种子的数量所产生的效果。

关键词：蓖麻着生节位 b9 雌花花粉不育

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ELECTRICAL TRANSPORT PROPERTIES OF PRISTINE AND IODINE DOPED POLYETHERIMIDES

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Chinese Journal of Polymer Science 2011年第5期29卷 586-596页

作者： J.k.Quamara Randhir Singh b.k.kaushik Physics Department National Institute of TechnologyKurukshetra 136119India

Electrical conduction behavior of pristine and iodine doped polyetherimides （PEI） has been investigated under both transient and steady state conditions in the operating temperature range 50-200℃ at various electric fields of 12-60 kV/cm. The transient currents show the hyperbolic decay character, and the decay exponent p （a measure of current decay rate） decreases with temperature （T） and doping concentration. The origin of transient currents has been attributed to the dipolar nature of carbonyl （〉C：O） groups and the ether linkages present in the main chain of PEI. The low field steady state conduction is ohmic in nature. The magnitudes of ionic jump distance （a） values do not favor an ionic type of conduction as a possible conduction mechanism in pristine as well as iodine doped PEI. The Schottky coefficients estimations do not show the possibility of Schottky type or Poole-Frenkel type conduction mechanisms in the low temperature region （〈 120℃）, however, in the high temperature region （〉 120℃） there is a certain possibility of Poole- Frenkel type conduction mechanism in both pristine and iodine doped samples. The dual slope in the lg/versus 1/T curves for iodine doped samples indicates the presence of more than one type of trapping levels.

关键词： Transient currents Electrical conduction Polyetherimide.

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A Comprehensive Survey on Federated Learning Applications in Computational Mental Healthcare

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 49-90页

作者： Vajratiya Vajrobol Geetika Jain Saxena Amit Pundir Sanjeev Singh Akshat Gaurav Savi bansal Razaz Waheeb Attar Mosiur Rahman brij b.Gupta Institute of Informatics and Communication University of DelhiDelhi110021India Maharaja Agrasen College University of DelhiDelhi110096India Computer Engineering Ronin InstituteMontclairNJ 07043USA Department of Research and Innovation Insights2TechinfoJaipur302001India University Centre for Research and Development(UCRD) Chandigarh UniversityChandigarh140413India Management Department College of Business AdministrationPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia CCRI&Department of Computer Science and Information Engineering Asia UniversityTaichung413Taiwan Symbiosis Centre for Information Technology(SCIT) Symbiosis International UniversityPune411057India Center for Interdisciplinary Research University of Petroleum and Energy Studies(UPES)Dehradun248007India

Mental health is a significant issue worldwide,and the utilization of technology to assist mental health has seen a growing *** aims to alleviate the workload on healthcare professionals and aid *** applications have been developed to support the challenges in intelligent healthcare ***,because mental health data is sensitive,privacy concerns have *** learning has gotten some *** research reviews the studies on federated learning and mental health related to solving the issue of intelligent healthcare *** explores various dimensions of federated learning in mental health,such as datasets(their types and sources),applications categorized based on mental health symptoms,federated mental health frameworks,federated machine learning,federated deep learning,and the benefits of federated learning in mental health *** research conducts surveys to evaluate the current state of mental health applications,mainly focusing on the role of Federated Learning(FL)and related privacy and data security *** survey provides valuable insights into how these applications are emerging and evolving,specifically emphasizing FL’s impact.

关键词： Depression emotional recognition intelligent healthcare systems mental health federated learning stress detection sleep behaviour

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Unsteady natural convection Couette flow of heat generating/absorbing fluid between vertical parallel plates filled with porous material

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Applied Mathematics and Mechanics(English Edition) 2012年第3期33卷 303-314页

作者： b.k.JHA M.k.MUSA Department of Mathematics Ahmadu Bello UniversityZaria 234Nigeria Mathematics Unit School of Basic and Remedial StudiesAhmadu Bello UniversityFuntua 6007Nigeria

The extended brinkman Darcy model for momentum equations and an energy equation is used to calculate the unsteady natural convection Couette flow of a viscous incompressible heat generating/absorbing fluid in a vertical channel （formed by two infinite vertical and parallel plates） filled with the fluid-saturated porous medium. The flow is triggered by the asymmetric heating and the accelerated motion of one of the bounding plates. The governing equations are simplified by the reasonable dimensionless parameters and solved analytically by the Laplace transform techniques to obtain the closed form solutions of the velocity and temperature profiles. Then, the skin friction and the rate of heat transfer are consequently derived. It is noticed that, at different sections within the vertical channel, the fluid flow and the temperature profiles increase with time, which are both higher near the moving plate. In particular, increasing the gap between the plates increases the velocity and the temperature of the fluid, however, reduces the skin friction and the rate of heat transfer.

关键词： heat generating/absorbing fluid natural convection flow porous material acceleration motion

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250小型连轧机轧制合金钢的温度制度

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河北冶金 1980年第3期 67-72页

作者： b.k格里高里耶夫

严重地影响轨钢工艺参数、成品质量和节约金属的最重要因素,乃是轧前钢坯的最理想加热和变形温度。金属烧损的总损耗费用,系加热每吨钢坯为0.5～1.5卢布,对于优质钢,损耗费用还会更多。大家知道,钢坯的氧化速度是随着温度的升高而不均... 详细信息

严重地影响轨钢工艺参数、成品质量和节约金属的最重要因素,乃是轧前钢坯的最理想加热和变形温度。金属烧损的总损耗费用,系加热每吨钢坯为0.5～1.5卢布,对于优质钢,损耗费用还会更多。大家知道,钢坯的氧化速度是随着温度的升高而不均匀地加大的。在700℃以下加热时,氧化铁皮几乎不增加;当温度在750℃以上时,开始急剧氧化。若湿度超过900℃,则氧铁皮的生成量,随加热温度的

关键词：钢坯加热轧件氧化铁皮金属损耗粗轧成品表面缺陷钢材型材轧钢机轧制设备轧机机械元件机座表面温度温度制度

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Anisotropic strange quark star in Finch-Skea geometry and its maximum mass for non-zero strange quark mass(m_(s)≠0)

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Chinese Physics C 2023年第5期47卷 195-210页

作者： b.Das k.b.Goswami A.Saha P.k.Chattopadhyay Department of Physics Coochbehar Panchanan Barma UniversityVivekananda StreetCoochbehar 736101West BengalIndia Department of Physics Alipurduar CollegeAlipurduar 736122West BengalIndia

A class of relativistic astrophysical compact objects is analyzed in the modified Finch-Skea geometry described by the MIT bag model equation of state of interior matter,p=1/3(ρ-4b),where b is known as the bag constant.b plays an important role in determining the physical features and structure of strange *** consider the finite mass of the strange quark(m_(s)≠0) and study its effects on the stability of quark matter inside a *** note that the inclusion of strange quark mass affects the gross properties of the stellar configuration,such as maximum mass,surface red-shift,and the radius of strange quark *** apply our model physically,we consider three compact objects,namely,(ⅰ) VELA X-1,(ⅱ) 4U 1820-30,and(ⅲ) PSR J 1903+327,which are thought to be strange *** range of b is restricted from 57.55 to bstable(MeV/fm3),for which strange matter might be stable relative to iron(^(56)Fe).However,we also observe that metastable and unstable strange matter depend on b and *** energy conditions hold well in this *** in terms of the Lagrangian perturbation of radial pressure is studied in this paper.

关键词： compact star strange star anisotropy MIT EoS strange quark mass

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