Results 21 to 30 of about 17,879 (217)
Research of plasmonic metamaterial absorbers based on graphene [PDF]
, 2016 石墨烯，一种碳原子呈蜂窝状排布的二维单层晶体，因其特殊的性质在光电领域备受关注。然而，在可见光频域石墨烯的光吸收率仅为2.3%。为了增强光吸收效果，我们发现：石墨烯具备较低的阻抗损耗，通过与金属超材料纳米结构组合可以大大提高光吸收率。石墨烯内部还有电可调的等离激元，可用于电光调制吸收。由于石墨烯的等离谐振能够发生在不同的光学频段，基于石墨烯的光学器件因此具备波长选择特性。 本文基于以上设想，对石墨烯-光相互作用的研究从两个层面展开： 一是结合金属超材料结构，设计出波长可调的光吸收体 ...
李嘉晔
core
Study on multi-parametric texture analysis for quantifying brain magnetic susceptibility in patients with Parkinson′s disease [PDF]
Objective·To quantify brain iron content in Parkinson′s disease (PD) patients by using quantitative susceptibility mapping (QSM) based on phase linearity fitting.
PEI Mengchao, ZHAO Xinxin
core +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Translanguaging theory and practices have enabled multilingual spaces where students’ full linguistic repertoires are valued, explored, and utilized by educators as resources across educational settings. However, research reporting supervision pedagogies incorporating international doctoral students’ multilingualism as intellectual resources ...
Wei Liu +3 more
wiley +1 more source
Analysis of the influencing parameters of stability for half-through steel arch bridge [PDF]
, 2016 以某中承式钢拱桥为研究对象,基于有限元稳定分析理论,采用大型有限元软件ANSYS,对该拱桥的稳定安全系数进行了计算,并从荷载布置方式、拱肋抗弯刚度、主梁抗弯刚度、吊杆刚度等方面,分析了影响该拱桥稳定性的因素,得到了一些有价值的结论。Based on the stability theory of arch bridge,the finite element software ANSYS is used to calculated the stability factor and study the ...
李双全
core
Zhejiang Daxue xuebao. Lixue ban, 2011 可控中空光束是适合于描写中央强度为零的激光束.将分数傅里叶变换用于处理可控中空光束的传输.基于广义惠更斯-菲涅耳衍射公式，导出了可控中空光束经分数傅里叶变换系统的解析传输公式.运用所得到的解析表达式，通过数值计算考查了可控中空光束在分数傅里叶变换面上的特性，分析了分数傅里叶变换面上的强度分布与各不同参数间的依赖关系.
ZHOUYi-min(周益民) +1 more
doaj +1 more source
Policy Studies Journal, EarlyView.Abstract In 2016, the Colombian government and the leftist insurgency group FARC (Fuerzas Armadas Revolucionarias de Colombia – Ejército del Pueblo) signed an agreement that ensures women's greater participation in the peace implementation process, their access to benefits from the programs, and their ability to reform initiatives in the agreement ...
Madhav Joshi
wiley +1 more source
The Effect of Gender Difference on Unemployment Duration and Re－employmentOpportunity : A Case study of“4050”unemployees in Xiamen [PDF]
, 2007 摘要: 本文应用生存模型中的非参数法和COX半参数法, 经验分析了性别对厦门市“4050”失业者的失业持续时间与再就业机会的影响。经验分析结果表明, 性别对“4050”失业者的失业持续时间与再就业机会具有比较显著的影响, 男性的平均失业持续时间为2117 个月, 比女性的1619 个月长418个月, 其再就业机会是女性的01674 倍。本文认为“4050”劳动力再就业市场上的阴盛阳衰现象在于“4050”劳动力再就业市场上男性的工作机会及接受工作的概率低于女性。因此, 转变就业观念, 择 业不挑肥拣瘦 ...
魏立萍
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Jixie chuandong, 2021 针对某航空发动机用双列角接触球轴承运行过程中摩擦功耗的变化，基于滚动轴承动力学理论，建立了双列角接触球轴承动力学微分方程组，采用预估-校正Adams-Bashforth-Moulton多步积分算法进行求解，分析了轴承工况参数和结构参数对其摩擦功耗的影响规律，并通过正交分析方法对轴承结构参数进行了优化。结果表明，随着轴承转速、轴向载荷、预紧量的增加，轴承总摩擦功耗均呈增大的趋势；随着滚动体个数、内外沟曲率半径系数的增加，轴承总摩擦功耗呈现减小的趋势；内沟曲率半径系数对轴承摩擦功耗影响最大 ...
刘悦阳, 杨海生, 苏冰, 邓四二
doaj +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2013 定义并研究了广义Kum指数分布(GKumE).给出GKumE分布的分布函数、密度函数以及风险函数，并讨论了其密度函数的展开以及一些数学性质.采用极大似然估计方法对GKumE分布参数进行估计.最后，利用一组实际寿命数据分析了GKumE分布的应用.
ZHOUWei(周唯), ZHANGGuo-fen(张帼奋)
doaj +1 more source
Basic income trials and the politics of scale: A research agenda
Policy Studies Journal, EarlyView.Abstract The growing popularity of basic income has led to extensive trials of the policy in numerous settings across the world. However, analysis of the politics of basic income, and in particular the political dynamics preceding and resulting from trial programs, lags. In response, we propose a research agenda that uses political scale to investigate
Jurgen De Wispelaere +2 more
wiley +1 more source