检索结果-南通市图书馆

International Journal of Biomathematics 2021年第6期14卷 85-114页

作者： Rajneesh Kumar Chaudhary Dinesh Kumar Kabindra nath Rai Jitendra Singh Department of Mathematics Institute of Science Banaras Hindu UniversityVaranasi-221005India Department of Mathematics Govt.Polytechnic College Nawada-805122BiharIndia Department of Mathematical Sciences IIT-BHU Varanasi-221005India

In this paper,the temperature distribution in the multi-layer of the skin is studied when the skin surface is subjected to most generalized boundary *** skin model consists of three layers known as the epidermis,dermis,and subcutaneous *** layers of skin are assumed to be connected with point of interface condition and taking the barrier in between each of the two layers by symmetric flux condition and analyzing each layer *** classical Fourier and non-Fourier(DPL)models are extended to analyze the behavior of heat transfer in the multi-layer of the *** Laplace transform technique is used to derive analytical solutions for the multi-layer of skin *** effects of the variability of different parameters such as relaxation time,layer thickness,and different types of boundary conditions on the behavior of temperature distribution in the multi-layer of skin are analyzed and discussed in *** the effects are shown *** has been observed that during temperature distribution in the multi-layer of skin,the measurement of skin damage is less on the DPL model(rq>Tt)in comparison to the classical Fourier model.

关键词： Skin of multi-layer generalized boundary condition dual-phase lagging burn effect relaxation time Laplace transform technique

Polymerization of lactide and synthesis of block copolymer catalyzed by copper(Ⅱ) Schiff base complex

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第12期27卷 1763-1766页

作者： Anita Routaray Somanath Mantri Nibedita nath Alekha Kumar Sutar Tungabidya Maharana Catalysis Research Lab Department of Chemistry Ravenshaw University Cuttack-3 Odisha India Department of Chemistry National Institute of Technology Raipur India

In the present investigation, the novel copper Schiff base complex was synthesized and its catalytic activity was evaluated for the ring-opening polymerization （ROP） of lactide and block polymerization of poly（lact... 详细信息

关键词： ROP Lactide Schiff Base Copper complex PLA Block polymer

Does recurrent catatonia manifest in a similar fashion in all the episodes of mood disorder?A case series with literature review

在线全文

学校读者我要写书评

暂无评论

General Psychiatry 2021年第5期34卷 8-11页

作者： Santanu nath Rosali Bhoi Biswaranjan Mishra Susanta Padhy Psychiatry All India Institute of Medical SciencesDeogharJharkhandIndia Psychiatry All India Institute of Medical SciencesBhubaneswarOdishaIndia

Catatonia,originally conceptualised by Kahlbaum in 1868,is a neuropsychiatric condition that has been found to occur concomitantly with several organic and psychiatric *** from the era of Kraepelin and Bleuler,this condition was faultily linked with schizophrenia alone;however,over time,greater associations have been found between catatonia and mood *** the availability of several reports supporting this finding,there is a relative paucity of studies that specifically focus on catatonia to be the first symptom manifestation heralding a subsequent mood *** addition,there is scant literature to determine whether there are specific presentations of catatonia that show greater associations with mood disorders and whether these signs and symptoms recur in a stereotypical fashion in the subsequent mood episodes in the lifetime of an *** hereby report two cases with a diagnosis of mood disorders(bipolar disorder and recurrent depressive disorder)who had catatonia as the initial symptom not only at presentation but also at subsequent *** report emphasises that recurrent catatonia can be the initial clinical manifestation of an underlying mood episode,which appears otherwise masked behind the catatonic *** catatonic symptoms can be interestingly similar in all the subsequent episodes.A detailed clinical evaluation is thus warranted after catatonia has been duly treated to provide a holistic management.

关键词： subsequent otherwise lifetime

A framework for considering ecological interactions for common non-timber forest product species:a case study of mountain date palm(Phoenix loureiroi Kunth)leaf harvest in South India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2013年第1期2卷 212-220页

作者： Lisa Mandle Tamara Ticktin Snehlata nath Siddappa Setty Anita Varg Botany Department University of Hawai'i at MānoaMānoaHawai'iUSA Ecology Evolution and Conservation Biology ProgramUniversity of Hawai'i at MānoaMānoaHawai'iUSA Keystone Foundation KotagiriTamil NaduIndia Ashoka Trust for Research in Ecology and the Environment BangaloreKarnatakaIndia Natural Capital Project Woods Institute for the EnvironmentStanford UniversityStanfordCAUSA.

Introduction:Many economically important non-timber forest products(NTFPs)come from widespread and common plant *** of these species often is assumed to be sustainable due to their ***,because of the ecological roles of common species,harvest may affect and be affected by ecological interactions at broader scales,which are rarely considered when evaluating the sustainability of *** use a case study of the mountain date palm(Phoenix loureiroi Kunth),harvested in South India to produce brooms,to present a conceptual framework illustrating how intensive harvest of a common species interacts with other anthropogenic management practices,plant-animal interactions and surrounding environmental ***:We apply this framework to understanding the impacts of mountain date palm harvest in the southern Western Ghats regions of the Indian states of Tamil Nadu and *** integrate data on the extent and levels of commercial harvest,local management practices,the ecological context in which harvest occurs,and research on harvest *** use this information to document the intensity and extent of mountain date palm harvest in the study area,identify the ecological implications of harvest,and demonstrate how a framework that considers harvest in the context of ecological communities and ecosystems is important for assessing the impacts of harvest of common NTFP ***:We show that mountain date palm leaves are heavily harvested from natural areas in the southern Western Ghats but that harvest levels have declined in recent *** date palm management and harvest occur within a network of ecological interactions,linking human activities to population-,community-,and ecosystem-level *** demonstrate that understanding the effects of return interval of anthropogenic fire,herbivory by wild animals and livestock,as well as the light environment in which harvest occurs are critical to assessing the sustainab

关键词： Non-timber forest product(NTFP) Western Ghats Savanna woodland Resource management Plant-animal interactions Fire Herbivory

Development and evaluation of robust tree biomass equations for rubber tree (Hevea brasiliensis) plantations in India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forest Ecosystems 2017年第3期4卷 241-250页

作者： Biplab Brahma Gudeta W.Sileshi Arun Jyoti nath Ashesh Kumar Das Department of Ecology and Environmental Science Assam University

Background： In India, rubber（Hevea brasiliensis） plantations cover -0.8 million ha of land, emphasizing its significant role in the Earth＇s carbon dynamics. Therefore, it is important to estimate the biomass stocks of plantations precisely in the context of carbon management. Previous studies in India have focused on development of allometric equations for estimating aboveground biomass（AGB） through harvesting younger trees（up to 14 yr）only or on studies with small sample sizes without assessing model bias. The objective of this study was to develop biomass estimation models for different tree components in rubber plantations and assess model predictive performance at the stand ***： A total of 67 trees were harvested from plantations of different ages（6, 15, 27 and 34 yr） in North East India and their diameter at 200 cm（D）, height and dry weights of different tree components were recorded. The data were used for evaluation of H-D and biomass estimation models at the stand ***： The Michaelis-Menten function was found to be the most appropriate model for estimating tree height among 10 commonly used H-D models. For estimation of AGB and coarse root biomass, a model that involves tree volume（i.e. D2 H） was found to provide better prediction than either D or H alone or a model that combines H, D and stand density. The estimated AGB varied from 28 Mg·ha-（-1） in 6 yr. old plantation to 169 Mg·ha-（-1） in 34 yr. old *** coarse root biomass was estimated at 4 Mg·ha-（-1） for 6 yr. old plantation and 12 Mg·ha-（-1） for 34 yr. old ***： It is concluded that models involving tree volume are more appropriate for regional level biomass estimation than simple power-law models for individual stands. We recommend that the power-law model should not be used for estimation of AGB in plantations at different growth stages because power-law parameters can be biased due to data truncation.

关键词： Aboveground biomass Data truncation Michaelis-Menten function Power-law

Drag reduction by application of aerodynamic devices in a race car

在线全文

学校读者我要写书评

暂无评论

Advances in Aerodynamics 2021年第1期3卷 66-85页

作者： Devang S.nath Prashant Chandra Pujari Amit Jain Vikas Rastogi Department of Mechanical Engineering Delhi Technological UniversityDelhi 110042India

In this era of fast-depleting natural resources,the hike in fuel prices is *** stringent norms over environmental policies,the automotive manufacturers are on a voyage to produce efficient vehicles with lower ***-speed cars are at a stake to provide uncompromised performance but having strict rules over emissions drives the companies to approach through a different route to keep the demands of performance *** of the most sought-after ways is to improve the aerodynamics of the *** force is one of the major setbacks when it comes to achieving high speeds when the vehicle is in *** research aims to examine the effects of different add on devices on the vehicle to reduce drag and make the vehicle aerodynamically streamlined.A more streamlined vehicle will be able to achieve high speeds and consequently,the fuel economy is also *** three-dimensional car model is developed in SOLIDWORKS *** Fluid Dynamics(CFD)is performed to understand the effects of these add on *** is carried out in the ANSYS^(TM) 17.0 Fluent *** Coefficient(CD),Lift Coefficient(CL),Drag Force and Lift Force are calculated and compared in different *** result of the simulations was analyzed and it was observed that different devices posed several different functionalities,but maximum drag reduction was found in the case of GT with spoiler and diffuser with a maximum reduction of 16.53%.

关键词： Aerodynamics CFD Drag force Drag coefficient High speed car

Shadow banking:a bibliometric and content analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Financial Innovation 2021年第1期7卷 1586-1614页

作者： Ridoy Deb nath Mohammad Ashraful Ferdous Chowdhury Department of Business Administration Shahjalal University of Science and TechnologySylhetBangladesh

This study reports on our systematic review of 2008–2021 literature on shadow *** present an overview of the shadow banking sector,wherein we discuss the definitions,evolution,functions,and specific activities that comprise *** conducted a bibliometric analysis using the VOSviewer bibliometric tool on articles collected from the Scopus database,after which we conducted content analysis on top articles from leading sources,and identified four major streams of shadow banking ***,we identified gaps in the literature and proposed seven research questions to be addressed in future studies to advance knowledge of the shadow banking *** findings of this review may serve as a robust reference for scholars researching various aspects of shadow banking to develop our understanding of this sector.

关键词： Shadow banking Review study Bibliometric analysis Content analysis VOSviewer

Numerical simulations of morphological changes in barrier islands induced by storm surges and waves using a supercritical flow model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2014年第1期8卷 57-68页

作者： Soumendra nath KUIRY Yan DING Sam S Y WANG Environmental & Water Resources Engineering Division Department of Civil Engineering lndian Institute of Technology Madras Tamil Nadu 600036 India National Center for Computational Hydroscienee and Engineering The University of Mississippi University MS 38677 USA

In this paper, an advanced explicit finite volume flow model in two-dimensions is presented for simulating supercritical coastal flows and morphological changes in a tidal/coastal inlet and barrier islands due to storm surges and waves. This flow mode/ is coupled with existing wave-action mode/and sediment transport mode/. The resulting integrated coastal process model is capable of simulating flows induced by extreme conditions such as waves, surge tides, river flood flows, etc., and morphological changes induced by rapid coastal currents and waves. This developed supercritical ftow model is based on the solution of the conservative form of the nonlinear shallow water equations with the effects of the Coriolis force, uneven bathymetry, wind stress, and wave radiation stresses. The forward Euler scheme is used for the unsteady term; and the convective term is discretized using the Godunov-type shock- capturing scheme along with the HLL Riemann solver on non-uniform rectilinear grids. The accuracy of the developed model is investigated by solving an experimental dam-break test case. Barrier island breaching, overflow and overwash due to severe storm attack are simulated and the predicted morphological changes associated to the events are analyzed to investigate the applicability of the model in a coast where all the physical forces are present.

关键词： coastal inlet coastal process modeling supercritical flow sediment transport barrier islands

Effect of Environment on Photo-detachment Dynamics of Halide Ions： A Model Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2010年第1期23卷 30-38,I0001页

作者： Bikram nath Chandan Kumar Mondal 萨哈核物理研究所晶体学和分了生物学司加尔各答700064 贾德普大学物理化学部化学系加尔各答700032

A two dimensional model approach for the photodetachment dynamics of closed shell an-ionic systems in presence of external light field have been proposed in the context of polar environmental media. The effects of strong coupling between the solvent polarization and the extra charge in the system were studied by a simple model. The electronic states of con-cerned halide ions are represented by a two dimensional model Hamiltonian with a potential V（x,y）=-V0e^-σ（x^2＋y^2）. The time dependent Fourier grid Hamiltonian method have been used to follow the detachment process with fairly high intensities of light. The environmental effects on the dynamics are sought to be modeled by two different ways. The first one was the presence of polar solvents which perturb the energy levels of anionic systems by changing the effective potential surface and the second one was allowing the fluctuation of the well depth randomly to mimic the system in a more realistic view point. The average detachment rate constant is calculated as a function of important parameters of the used light field to explain the effects of solvent field on the dynamical behavior of dipole bound anionic system at least in a qualitative way.

关键词： Photodetachment dynamics Environmental effect Time-dependent Fourier grid Hamiltonian Stochastic deactivation

Ecological Consequences of Land Use Change: Forest Structure and Regeneration across the Forest-grassland Ecotone in Mountain Pastures in Nepal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2014年第4期11卷 838-849页

作者： Lila nath SHARMA Ole Reidar VETAAS Ram Prasad CHAUDHARY Inger Elisabeth MREN Department of Geography University of Bergen Bergen 5020 Norway Research Centre for Applied Science and Technology and Central Department of Botany Tribhuvan UniversityKathmandu 977 Nepal

The ecotone, the spatial transition zone between two vegetation communities, is claimed to have more species than the adjoining communities. However, empirical studies do not always confirm higher richness at the ecotone. The ecotone position and structure are dynamic over time and space and it is driven by the changes in climate, land use or their interaction. In this context, we assessed the forest- grassland ecotone of temperate mountains in central Nepal by i） comparing species composition and richness across the ecotone, ii） analyzing if the forestgrassland ecotone is shifting towards the grassland center by colonizing them with trees, and iii） discussing the consequence of changed disturbance regime in the dynamics of this ecotone and the surrounding grasslands. We analyzed vegetation data sampled from belt transects laid across the forest- grassland ecotone in semi-natural grassland patches. Vegetation data consisting of species richness and composition, and size structure and regeneration of the two most dominant tree species, namely Rhododendron arboreum and Abies spectabilis, from the transects, were used to analyze the trend of the forest-grassland ecotone. Forest and grasslands were different in terms of floristic composition and diversity. Vascular plant speciesrichness linearly increased while moving from forest interior to grassland center. Spatial pattern of tree size structure and regeneration infers that forest boundary is advancing towards the grasslands at the expense of the grassland area, and tree establishment in the grasslands is part of a suceessional process. Temporally, tree establishment in grasslands started following the gradual decline in disturbance. We argue that local processes in terms of changed land use may best explain the phenomenon of ecotone shift and consequent forest expansion in these grasslands. We underpin the need for further research on the mechanism, rate and spatial extent of ecotone shift by using advaneed tools to

关键词： Ecotone shift Grasslands Forest Landuse change Rhododendron