Results 21 to 30 of about 18,969 (167)
Devices of Graphene Synthesized by Laser Chemical Vapor Deposition and Research on the Key Technologies [PDF]
, 2015 基于石墨烯优异的电子、机械、热学、光学性能以及广阔的应用前景，自2004年被发现以来迅速成为材料学与物理学领域的研究热门。目前，制备石墨烯的方法有很多，但是如何实现石墨烯的快速生长、生长区域的可控性、微区生长以及非转移生长一直是石墨烯在电子器件上应用必须解决的问题。通过对石墨烯多种制备方法的比较，我们发现激光化学气相沉积法（LaserChemicalVaporDeposition,LCVD）是最有可能实现这一要求的方法，本文也将采用该方法进行石墨烯的制备 ...
陈永庆
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Conservation Biology, EarlyView.Scaling area‐based conservation, including initiatives led or comanaged by Indigenous Peoples and local communities, is a flagship goal of the Kunming‐Montreal Global Biodiversity Framework. Conservationists often aspire to scale initiatives, but this is rarely achieved in practice. Identifying and addressing factors that limit initiative adoption (i.e.
Thomas Pienkowski +39 more
wiley +1 more source
, 2016 A geothermal well in Ganzi was chosen for the study. To provide a reference for the design and construc?tion of a geothermal plant, power generation techniques were selected and the thermodynamic process was calculat?ed based on cold and heat source ...
卜宪标 +3 more
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Hobbyist preferences for pet freshwater turtles
Conservation Biology, EarlyView.Abstract The burgeoning pet trade is a primary threat to wild freshwater turtles worldwide. Although the risks from commercial exploitation of turtles have been discussed widely, there is little empirical research on preferences for pet turtles from a hobbyists’ perspective.
Jingjing Zhao +7 more
wiley +1 more source
CFD Modeling of Tubular Loop and Fluidized Bed Reactors for Propylene Polymerization [PDF]
, 2010 为消化吸收国外引进的丙烯聚合装置，并理论指导国内丙烯聚合反应器的自行设计与放大工作，本论文以中试规模的Spheripol-II工艺的丙烯聚合环管和流化床反应器为研究对象，运用计算流体力学方法及Fluent软件，分别建立环管与流化床反应器的稳态与动态欧拉双流体模型。利用上述建立的模型分析各反应器内部的传递规律。主要研究内容如下： 1、对于环管反应器，首先通过三维CAD软件Pro/Engineer绘出轴流泵与环管的三维模型，在Gambit软件中划分该系统的网格。在此基础上，建立了环管反应器内液-固二相的 ...
施德？
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Numerical simulation of zinc dross diffusion in a continuous hot dip galvanized zinc pot under the industrial production condition [PDF]
, 2016 Based on the discrete phase model of the Euler-Lagrange equation,the concentration fields of three different types of zinc dross under a circulating purification system were calculated by using the numerical simulation method.
DONG An-ping +4 more
core +1 more source
Informing spatial conservation prioritization with species’ traits
Conservation Biology, EarlyView.Abstract New Guinea, the most botanically diverse island on the planet, is the location for one of the boldest conservation initiatives. The Manokwari Declaration aims to achieve 70% conservation designation for the Bird's Head Peninsula. This is 40% higher than the 2022 Global Biodiversity Framework target.
Liam A. Trethowan +27 more
wiley +1 more source
Gaoya dianqi, 2018 由于SF6气体温室效应显著,CO2气体作为目前具有潜力环保型SF6替代气体之一,以CO2气体作为绝缘和灭弧介质的断路器已经得到应用。实际上,喷口材料烧蚀将导致PTFE蒸汽作为杂质影响电弧等离子体的物性参数从而影响断路器的开断性能。为了建立物理模型研究和优化断路器开断性能,必须首先确定电弧等离子体物性参数。因此文中研究了0.6 MPa下温度区间为300～30 000 K时的CO2-PTFE电弧等离子体物性参数。首先基于最小Gibbs自由能法确定了电弧等弧等离子体粒子组分 ...
韩桂全 +5 more
doaj
, 1987 文献[3,4]表述了描述等离子CVD化学反应器流场的数学物理模型,并利用Patankar方法对冷热流场作了求解。本文在此基础上就影响反应器流场、温度场和浓度场的有关参数作了理论研究。所研究的问题有:冷热流场的差别,喷射环缝密度和主流旋转速度对流动的影响。所得结果清楚地表明:这些参数的选择对反应器的性能有着不同程度的影响 ...
朱清文, 赵国英
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轮式移动机器人瞬态模型鲁棒自适应同步终端滑模编队控制 (Robust adaptive synchronized formation control for the transient model of wheeled mobile robots with terminal sliding mode) [PDF]
, 2019 In the cooperative formation of wheeled mobile robots, the problem how to guarantee that mobile robots can track their own trajectories while synchronizing motions with others puts forward higher requirements on the design of control algorithms. A robust
Cui, Wenhao, Yan, Xinggang, Zhao, Dongya
core +1 more source