检索结果-南通市图书馆

Environmental drivers of seasonal shifts in abundance of wild pigs(Sus scrofa)in a tropical island environment

维普期刊数据库评论

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 2022年第1期11卷 772-786页

作者： derek r.risch Shaya Honarvar Melissa r.Price Natural resources and Environmental Department University of Hawaiʻi at Mānoa1910 East-West RoadHonoluluHI 96822USA Pacific Cooperative Studies Unit University of Hawaiʻi at Mānoa3190 Maile WayHonoluluHI 96822USA

Background:Non-native wild pigs(Sus scrofa)threaten sensitive flora and fauna,cost billions of dollars in economic damage,and pose a significant human–wildlife conflict *** growing interest in wild pig research,basic life history information is often lacking throughout their introduced range and particularly in tropical *** to other large terrestrial mammals,pigs possess the ability to shift their range based on local climatic conditions or resource availability,further complicating management *** objectives of this study were to(i)model the distribution and abundance of wild pigs across two seasons within a single calendar year;(ii)determine the most important environmental variables driving changes in pig distribution and abundance;and(iii)highlight key differences between seasonal models and their potential management *** study objectives were achieved using zero-inflated models constructed from abundance data obtained from extensive field surveys and remotely sensed environmental ***:Our models demonstrate a considerable change in distribution and abundance of wild pigs throughout a single calendar *** and vegetation height were among the most influential variables for pig distribution during the spring,and distance to adjacent forest and vegetation density were among the most significant for the ***,our seasonal models show that areas of high conservation value may be more vulnerable to threats from wild pigs at certain times throughout the year,which was not captured by more traditional modeling approaches using aggregated ***:Our results suggest that(i)wild pigs can considerably shift their range throughout the calendar year,even in tropical environments;(ii)pigs prefer dense forested areas in the presence of either hunting pressure or an abundance of frugivorous plants,but may shift to adjacent areas in the absence of either of these conditions;and(iii)seasonal m

关键词： Ecology Spatial Temporal Species distribution modeling Wild boar Sus scrofa Feral pigs

Synthesis of Hierarchical SnO2 Nanowire–TiO2 Nanorod Brushes Anchored to Commercially Available FTO-coated Glass Substrates

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2017年第3期9卷 93-100页

作者： derek r.Miller Sheikh A.Akbar Pat A.Morris Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43212USA

Growth of single-crystal Sn O_2 nanowires using a fluorine-doped Sn O_2(FTO) thin film as both the source and substrate is demonstrated for the first time at relatively low temperature(580 °C) which preserves the integrity of the underlying glass support and improves scalability to devices. Furthermore, a microwave hydrothermal process is shown to grow Ti O_2 nanorods on these nanowires to create a hierarchical nanoheterostructure that will lead to efficient photogenerated charge carrier separation and rapid transport of electrons to the substrate. This process simplifies nanowire growth by using commercially available and widely used FTO substrates without the need for an additional upstream Sn source and can be used as a high surface area host structure to many other hierarchical structures.

关键词： SnO2 Nanowire Fluorine-doped SnO2(FTO) Vapor–liquid–solid(VLS) TiO2 Nanorod brush

CONVErGENCE OF A CONSErVATIVE DIFFErENCE SCHEME FOr THE ZAKHArOV EQUATIONS IN TWO DIMENSIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1997年第3期15卷 219-232页

作者： Guo, bl Chang, QS INST APPL PHYS & COMPUTAT MATH BEIJING 100088PEOPLES R CHINA CHINESE ACAD SCI INST APPL MATHBEIJINGPEOPLES R CHINA

A conservative difference scheme is presented for the initial-boundary-value problem of a generalized Zakharov equations. On the basis of a prior estimates in L-2 norm, the convergence of the difference solution is proved in order O(h(2) + r(2)). In the proof, a new skill is used to deal with the term of difference quotient (e(j,k)(n))t. This is necessary, since there is no estimate of E(x, y, t) in L-infinity norm.

关键词： Math CONVErGENCE OF A CONSErVATIVE DIFFErENCE SCHEME FOr THE ZAKHArOV EQUATIONS IN TWO DIMENSIONS

Sensitivity analysis of a parallel-plate method for measuring the dielectric permittivity of high-voltage insulating materials

在线全文

学校读者我要写书评

暂无评论

High Voltage 2017年第3期2卷 200-204页

作者： Anton V.Vykhodtsev Behzad Kordi derek r.Oliver Department of Electrical and Computer Engineering University of Manitoba75a Chancellor's CircleWinnipegManitobaCanada R3T 5V62 Manitoba Institute for Materials University of Manitoba25 Sifton RoadWinnipegManitobaCanada R3T 2N2

Ascertaining the dielectric character of polymeric insulation materials is of particular interest for comparative studies that use accelerated ageing and samples from decommissioned *** the case of polymeric samples,the possibility of physical deformation within the sample holder adds additional variability to comparative *** readily obtainable instrumentation,this study undertakes a systematic sensitivity analysis of a parallel-plate capacitance measurement approach for polymeric materials that only has one capacitance plate in contact with the sample,avoiding issues of sample *** analysis demonstrates that the biggest contributor of uncertainty in the measurement of the relative permittivity and loss tangent is the precision with which the plate–plate and plate–sample separation is *** measurements show that the determination of loss tangent can be susceptible to uncertainties arising from electrical noise,but that these can be controlled further by utilising more refined instrumentation.

关键词： deformation plate analysis

THE GLOBAL DUFOrT-FrANKEL DIFFErENCE APPrOXIMATION FOr NONLINEAr rEACTION-DIFFUSION EQUATIONS

维普期刊数据库评论

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 Computational Mathematics 1998年第3期16卷 275-288页

作者： Lu, BN Wan, GH Guo, bl Xiangtan Univ Inst Computat & Appl Math Xiangtan 411105 Peoples R China Inst Appl Phys & Computat Math Lab Computat Phys Beijing 100088 Peoples R China Shaanzi Normal Univ Dept Math Xian 710062 Peoples R China Inst Appl Phys & Computat Math Ctr Nonlinear Studies Beijing 100088 Peoples R China

In this paper, the initial value problem of nonlinear reaction-diffusion equation is considered. The Dufort-Frankel finite difference approximation for the long time scheme is given for the d-dimensional reaction-diffusion equation with the two different cases. The global solution and global attractor are discussed for the Dufort-Frankel scheme. Moreover properties of the solution are studied. The error estimate is presented in a finite time region and in the global time region for some special cases. Finally the numerical results for the equation are investigated for Allen-Cahn equation and some other equations and the homoclinic orbit is simulated numerically.

关键词： global Dufort-Frankel method reaction-diffusion equation global attractor error estimate numerical experiments

The use of electro-deoxidation in molten salts to reduce the energy consumption of solar grade silicon and increase the output of PV solar cells

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2015年第6期25卷 583-590页

作者： Paul r.Coxon Michael Coto Eimutis Juzeliunas derek J.Fray Department of Materials Science & Metallurgy University of Cambridge Institute of Chemistry Centre for Physical Sciences & Technology 3. Klaip?da University

Solar photovoltaics,based upon silicon,are the most popular form of solar cell with efficiencies around 20%.These efficiencies can be further increased by employing light trapping schemes to minimise optical losses through scattering and reflection which enhances the amount of light absorbed and number of photo-carriers *** approaches employ antireflection coatings（ArCs） or texturise the surface of the silicon disks,so that the structure consists of an array of needles which can absorb most of the ***,these structures are created by leaching the silicon with hydrofluoric-based acids or by reactive ion etching（rIE） *** paper reviews some of the methods for improving the energy efficiency of silicon production,and describes the use of electro-deoxidation of SiO;layers,on silicon,in molten calcium chloride to form nanoporous black silicon（b-Si） *** coating b-Si surface with TiO;,a common ArC,extremely black surfaces with negligible reflectance of about 0.1%,are produced,which can have applications for low-cost high efficiency solar cells.

关键词： black silicon Solar cell photovoltaics Silicon molten salt Electrochemistry

Determination of Effectiveness of Energy Management System in Buildings

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy Engineering 2023年第2期120卷 561-586页

作者： Vivash Karki roseline Mostafa Bhaskaran Gopalakrishnan derek r.Johnson University of rochester RochesterNY14627USA Industrial and Management Systems Engineering West Virginia UniversityMorgantownWV26505USA Mechanical and Aerospace Engineering West Virginia UniversityMorgantownWV26505USA

Building Energy Management Systems(BEMS)are computer-based systems that aid in managing,controlling,and monitoring the building technical services and energy consumption by equipment used in the *** effectiveness of BEMS is dependent upon numerous factors,among which the operational characteristics of the building and the BEMS control parameters also play an essential *** research develops a user-driven simulation tool where users can input the building parameters and BEMS controls to determine the effectiveness of their *** simulation tool gives the user the flexibility to understand the potential energy savings by employing specific BEMS control and help in making intelligent *** simulation is developed using Visual Basic Application(VBA)in Microsoft Excel,based on discrete-event Monte Carlo Simulation(MCS).The simulation works by initially calculating the energy required for space cooling and heating based on current building parameters input by the user in the ***,during the second simulation,the user selects all the BEMS controls and improved building envelope to determine the energy required for space cooling and heating during that *** model compares the energy consumption from the first simulation and the second *** the simulation model will provide the rating of the effectiveness of BEMS on a continuous scale of 1 to 5(1 being poor effectiveness and 5 being excellent effectiveness of BEMS).This work is intended to facilitate building owner/energy managers to analyze the building energy performance concerning the efficacy of their energy management system.

关键词： Buildings energy management system demand controlled ventilation supply air temperature reset temperature setback control monte carlo simulation

STM image of tungstosilicic acid molecular layer on highly oriented pyrolytic graphite

维普期刊数据库评论

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 Journal of Chemistry 1995年第6期13卷 493-496页

作者： Zhang, bl Wang, EK CHINESE ACAD SCI CHANGCHUN INST APPL CHEMELECTROANALYT CHEM LABCHANGCHUN 130022JILINPEOPLES R CHINA

Molecular layer of tungstosilicic acid (H4SiW12O40) deposited on freshly-cleaved highly oriented pyrolytic graphite (HOPG) was observed by scanning tunneling microscopy (STM) in air at room temperature. The molecular dimension (11.5 Angstrom) of H4SiW12O40 measured by STM is consistent with known crystallographic parameter. We also imaged the boundary of H4SiW12O40 molecular layer on HOPG showing that molecular layer of H4SiW12O40 was formed. It has been proved that individual tungstosilicic acid species is imaged. The probable reason for the formation of the molecular layer is also discussed.

关键词： tungstosilicic acid HOPG STM

TENSILE PrOPErTIES OF COATED CArBON FIBEr rEINFOrCED MAGNESIUM COMPOSITES

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1997年第3期7卷 87-90页

作者： Zhang, K Wang, YQ Zhou, bl CHINESE ACAD SCI INST MET RESSHENYANG 110015PEOPLES R CHINA ACAD SINICA INT CTR MAT PHYSSHENYANG 110015PEOPLES R CHINA

ＴＥＮＳＩＬＥＰＲＯＰＥＲＴＩＥＳＯＦＣＯＡＴＥＤＣＡＲＢＯＮＦＩＢＥＲＲＥＩＮＦＯＲＣＥＤＭＡＧＮＥＳＩＵＭＣＯＭＰＯＳＩＴＥＳ①ＺｈａｎｇＫｕｎ，ＷａｎｇＹｕｑｉｎｇ，ＺｈｏｕＢｅｎｌｉａｎＩｎｓｔｉｔｕｔｅｏｆ... 详细信息

ＴＥＮＳＩＬＥＰＲＯＰＥＲＴＩＥＳＯＦＣＯＡＴＥＤＣＡＲＢＯＮＦＩＢＥＲＲＥＩＮＦＯＲＣＥＤＭＡＧＮＥＳＩＵＭＣＯＭＰＯＳＩＴＥＳ①ＺｈａｎｇＫｕｎ，ＷａｎｇＹｕｑｉｎｇ，ＺｈｏｕＢｅｎｌｉａｎＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌＲｅｓｅａｒｃｈ，Ｃｈｉ...

关键词： C/Mg composites coating thickness tensile properties