Results 121 to 130 of about 39,766 (300)
The influence of the electrical boundary conditions on domain structures and properties of epitaxial ferroelectric thin films [PDF]
, 2017 本文基于金兹堡-朗道理论的相场法，研究了以PbTiO3（PTO）为代表的二维外延铁电薄膜在四种不同叉指电极分布下的畴结构演化，也探讨了基体约束对铁电薄膜畴结构演化的影响。四种不同的叉指电极分布为：上下对称分布的叉指电极；上表面覆盖叉指电极，下表面覆盖完整电极；上下错位分布的叉指电极；上表面覆盖叉指电极，下表面无电极。这些电极分布可以运用现有的理论转换为四种不同的电学边界条件。 研究结果表明，相比于理想的开路和短路电学边界条件，由于不同电极分布下铁电薄膜的退极化能发生了改变，进而产生了多种特殊的畴结构，即：
雷俐莎
core
Moralization in Policy Narratives: Insights From the Politics of Climate Change and Public Health
Policy Studies Journal, EarlyView.ABSTRACT In this study, we examine the process of moralization—defined as the use of moral values to mobilize support for or against policy proposals. Specifically, we investigate how political parties strategically employ moralization to influence policy processes, varying their approach depending on their political ideology and institutional position.
Simon Schaub, Jale Tosun, Maria Becker
wiley +1 more source
, 2018 Pu(钚)是一种十分重要的核工业原料,随温度变化会有不同的结构,并且辐照对其有着重要的影响。为了探究辐照强度、辐照时间对钚的相变化的影响,本研究在纯Pu的吉布斯(Gibbs)自由能计算基础上,通过考虑辐照条件下空位产生的过剩自由能,建立了纯Pu在辐照条件下的热力学模型。计算不同辐照条件下的温度-吉布斯自由能函数,得到了不同辐照强度下纯Pu的相图,分析不同辐照强度、辐照时间对其6个同素异构体相稳定性的影响。研究结果表明:辐照对较低温度下纯Pu的相稳定性影响较大,接近室温时出现了γ-Pu的相区 ...
冯翔 +5 more
core
At the controls: Politics and policy entrepreneurs in EU policy to decarbonize maritime transport
Review of Policy Research, EarlyView.Abstract The recent adoption of the FuelEU Maritime regulation, aiming to decarbonize maritime shipping, is part of the EU clean energy transition to reach carbon neutrality by 2050. Based on autoethnographic method and qualitative text analysis, applying the multiple streams framework as a theoretical lens, this article explores and explains the ...
Fredrik von Malmborg
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2011 【目的】 探讨白细胞介素-17(IL-17)和白细胞介素-23(IL-23)在变应性鼻炎患者血清中的表达及其与血清特异性IgE的相关性【方法】 研究对象分为变应性鼻炎组(24例)和正常对照组(12例)，分别收集受试者的血清，采用瑞典Pharmacia公司UniCAP 100E全自动免疫荧光定量分析系统检测常见吸入性变应原血清特异性IgEELISA法检测血清中IL-17和IL-23表达情况【结果】12例正常对照组者血清sIgE结果均为0级，24例变应性鼻炎患者血清sIgE的浓度为2 ~ 6级IL ...
doaj
Zhongshan Daxue xuebao. Yixue kexue ban, 1998 目的: 研究相邻小时与小时之间室性早搏(VPC)密度的自发变异。方法: 分析 200 例 VPC(≥240 次/24 h)病人 24 h 动态心电图, 其中男 91例, 女 109 例,平均年龄( 40. 9±14. 4)岁。 临床诊断冠心病 64 例,高血压病 16 例, 其他心脏病 6 例; 114 例未发现器质性心脏病。记录动态心电图前停用所有抗心律失常药至少 5 个半衰期。应用直线回归分析, 观察 VPC 密度相邻小时与小时之间的相关性。每小时 VPC 密度既视为其前 1 h VPC ...
伍 卫 张旭明 孔敏仪
doaj
Embracing the politics of transformation: Policy action as “battle‐settlement events”
Review of Policy Research, EarlyView.Abstract Societal transformations for addressing climate change are intensely contested and at risk of resistance and backlash to ambitious policy action. But they are frequently modeled through heuristics such as S‐curves which abstract from such conflicts, assuming increasing returns to scale as a driver of transformations.
James Patterson, Matthew Paterson
wiley +1 more source