Results 91 to 100 of about 253,021 (198)
Production of top Quark pair at the large hadron collider(大型强子对撞机中顶夸克对的产生)
Zhejiang Daxue xuebao. Lixue ban, 2018 通过分析质心能量为8 TeV的质子-质子对撞实验，对大型强子对撞机上的ATLAS探测器，测量了顶夸克对产生过程pp→t的归一化微分散射截面，该实验数据对胶子部分子分布函数的确定非常重要.采用蒙特卡罗数值计算程序MadGraph以及CT10NNLO和CT14NNLO部分子分布函数，分别计算此过程的归一化微分散射截面，得到了与ATLAS实验相符的结果.进一步，用ATLAS实验数据和本文的理论计算结果，更新CT14NNLO部分子分布函数.结果显示，顶夸克对归一化微分散射截面对部分子分布函数不敏感 ...
ABLIKIMITursun(阿布力克木·吐尔孙) +1 more
doaj +1 more source
A link between increased temperature and avian body condition in a logged tropical forest
Conservation Biology, EarlyView.Abstract The combined effects of anthropogenic disturbances, such as logging and climate change, remain poorly understood; yet, they are the main threats to tropical biodiversity. Most tropical African countries lack long‐term climate data, so climate impacts on biodiversity cannot be assessed.
Moreen Uwimbabazi +7 more
wiley +1 more source
Gaoya dianqi, 2010 为了揭示复合绝缘子在污秽潮湿环境中运行时的电场分布特性,笔者基于复合绝缘子的污闪理论,研究了绝缘污秽电场模型和计算方法,采用污层表面电导率和模拟导电污层的电阻层边界条件,应用有限元电场计算软件ElecNet对复合绝缘子污秽电场进行了交流时谐电场计算分析,比较了污层沿绝缘子轴向均匀分布和不均匀分布两种情况下的绝缘子电场分布,分析了污层表面电导率大小（即不同的污秽度）以及污层分布状态对绝缘子表面电场分布的影响。得出,当伞裙上表面电导率高于下表面时,沿泄漏路径的电位分布线性度降低 ...
王仲奕, 王琪, 陈青
doaj
Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, EarlyView.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
Gaoya dianqi, 2009 针对800 kV氧化锌避雷器(MOA)的电位分布,笔者从数值仿真和试验两个方面进行分析。首先,采用有限元法及ANSYS分析了无并联电容时800 kV MOA的电位分布,得到了所有氧化锌组件(MOR)的电压偏差和每单元内MOR所占电压的百分比,并同时求出各法兰之间的部分电容和对地电容。并联电容后将MOA的"静电场"问题转化为"电路"问题,用节点电压法求出并联电容后的电位分布和MOR的电压偏差。接下来,采用自行研制的光纤测量系统对800 kV MOA的电位分布进行了实测,得出了流过MOR的电流分布曲线 ...
岳亚丽, 江少成, 张源斌
doaj
Surface Functionalization of Polymer Substrates through Radiation-Induced Graft Polymerization: Conventional and Controlled Polymerization Techniques [PDF]
, 2018 学位記番号 ...
Jordan F., Madrid +1 more
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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
Shuitu Baochi Xuebao, 2016 为了探讨塔克拉玛干沙漠腹地风沙流结构特征及尼龙网方格沙障对风沙流颗粒的分异作用，于2015年4月—2015年6月，选取裸沙地和沙障2种下垫面，利用集沙仪对地表风沙流进行观测，分析了尼龙网沙障对风沙流结构和沙粒粒径分布的分异过程。结果表明：（1）风沙流结构在裸沙地符合指数分布（y=321.025e-10.16x，R2=0.94），在沙障前部和中部分别表现出“象鼻”效应特征和近似于倒置的“象鼻”；沙障的设置，明显减少了近地面（0～42 cm）的输沙量。（2）在裸沙地 ...
黎小娟, 李, 丁新原
doaj
Zhejiang Daxue xuebao. Lixue ban, 2013 布尔差分和布尔e-导数是组合电路故障检测和布尔函数密码学性质研究的一种有效工具.从线性函数、冗余函数、自反函数、自双反函数、部分自反函数、部分自双反函数的定义出发，讨论了这些特殊布尔函数布尔差分和布尔e-导数的性质，并给出了相应的证明，为方便快捷地实现故障检测和密码学函数的构造奠定理论基础.
FANGWei-jie(方伟杰) +2 more
doaj +1 more source
Long-term longitudinal changes in baseline PSA distribution and estimated prevalence of prostate cancer in male Japanese participants of population-based PSA screening [PDF]
, 2019 学位記番号 ...
Oki, Ryo +2 more
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