Results 31 to 40 of about 27,716 (212)

Capacity‐Learning Paradox: How Hong Kong and Singapore's Crisis Responses Shape and Are Shaped by Policy Capacities

open access: yesReview of Policy Research, Volume 43, Issue 2, March 2026.
ABSTRACT This study examines the paradoxical relationship between policy learning and capacity: governments need certain capacities to learn effectively, yet these same capacities often emerge from previous learning experiences. Through a comparative analysis of Hong Kong and Singapore's responses to SARS and COVID‐19, we demonstrate how policy ...
Shubham Sharma, Xun Wu, Gleb Papyshev
wiley   +1 more source

氧化锌非线性电阻的评价方法

open access: yesDianci bileiqi, 1987
1.绪言在电子回路中使用的SiC、ZnO为主的各种非线性电阻,主要用于吸收电路中的过电压,而非线性优异的ZnO非线性电阻则己成为目前的主要方向。为此,本文将叙述ZnO非线性电阻的评价方法。 ZnO非线性电阻是含有特定的添加物(Bi2O3,CoO,MnO,Sb2O3,Cr2O3等)ZnO的烧结体,是在烧结体中呈现有新的晶界现象的一种陶瓷,它赋有优异的非线性和吸收过电压能力。因此 ...
住吉干夫, 松冈道雄, 严幼良
doaj  

基于改进的MOM-AOM法非线性负载下输电线路的雷击效应分析

open access: yesDianci bileiqi, 2020
利用频域频谱平衡技术,研究了避雷器终止的输电线路上雷击回击通道产生的电磁场对频域的影响,考虑了雷电返回行程通道和避雷器的非线性特性之间的耦合。采用天线理论(AT)模型对闪电通道进行建模,基于麦克斯韦方程的矩量法(MOM)的通用电磁方法来解决包括传输线的整个线性系统,将问题最终转换为非线性等效电路,通过修改的AOM方法来分析包括避雷器在内的频域的非线性。考虑到由接地避雷器终止的接地上方的传输线路的情况,给出了不同非线性载荷情况下所提出的改进模型的计算结果,证明了提出的改进模型的可行性和可靠性。
李伟, 杨红霞
doaj  

Integrating Urban Expansion and Flood Risk: A Spatial Assessment of Impervious Surface Growth and Floodplain Exposure in Mecklenburg County (2011–2021)

open access: yesWorld Water Policy, Volume 12, Issue 1, February 2026.
ABSTRACT Urban expansion significantly impacts flood risk, particularly in rapidly growing areas where impervious surfaces exacerbate surface runoff. This study examines spatial patterns of urban growth and their effects on flood exposure in Mecklenburg County, North Carolina, from 2011 to 2021.
Pegah Madadi, Azad Sadeghi
wiley   +1 more source

WDM系统中的光纤非线性效应及其对系统的影响

open access: yesGuangtongxin yanjiu, 2002
光纤非线性效应是限制波分复用 ( WDM)通信系统发展的主要因素 .文章系统地讨论了 WDM光纤系统中各种光纤非线性效应 ,着重于多信道非线性效应及其对系统的影响 .提出了各种有效地抑制非线性效应的措施 ,供系统设计者参考 .
林其银, 杨胜利
doaj  

Characteristic of surface EMG signals during non-fatigue dynamic exercise in female quadriceps femoris(非疲劳动态运动中女性股四头肌的sEMG信号特征)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2011
采集9名女性受试者在不同负荷功率踏车运动中股四头肌的表面肌电(surface electromyography,sEMG)信号,观察其线性时频指标AEMG、MPF与非线性分析指标C(n)、%DET的变化规律,探讨女性股四头肌在非疲劳动态负荷下肌肉活动水平与sEMG信号特征指标之间的相互关系.结果发现,AEMG值随功率的上升而逐渐增加,与负荷功率呈线性相关;频域指标MPF与负荷的递增无明显关联;除%DET在股外肌的100 W和175 W阶段出现区分度外,非线性指标C(n)和 ...
SONGChao(宋超)   +2 more
doaj   +1 more source

Housing Price shocks、Macroeconomic Volatility and Monetary Policy [PDF]

open access: yes, 2014
随着近二十年来全球范围的房地产繁荣与萧条周期循环,以及住房财富在家庭财富中所占比重的增长,越来越多的学者开始关注于房地产市场波动对宏观经济金融的冲击;尤其是2007年美国次贷危机之后,房价冲击对宏观经济的传导机制及其货币政策反应再次成为学者们关注的焦点。当前,全球经济正经历着艰难而曲折的复苏之路,中国也面临深刻的经济转型。在此背景下,本研究报告综合运用比较静态分析、动态最优化、门限模型、协整检验等理论与实证研究方法,揭示房价冲击向通胀、产出、家庭消费等宏观经济变量的传导机制 ...
段忠东
core  

High nitrogen enrichment buffers plant photosynthesis against herbivory damage

open access: yesFunctional Ecology, Volume 40, Issue 1, Page 229-238, January 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Herbivorous insects and nitrogen deposition are key drivers of ecosystem productivity under global change. However, their combined effects on plant photosynthesis, particularly during insect outbreaks, remain poorly understood in natural ecosystems.
Yongqiang Zhang   +6 more
wiley   +1 more source

高非线性光子晶体光纤的研究及应用

open access: yesGuangtongxin yanjiu, 2008
文章介绍了高非线性光子晶体光纤的特点及产生高非线性特性的基本原理,分析了在高非线性光子晶体光纤中产生超连续光谱和慢光效应的机理和其应用,并给出了国内利用文章作者研制的高非线性光子晶体光纤进行超连续谱和慢光试验的结果。
李进延   +5 more
doaj  

Participation Disenchants: How Online Political Participation Decreases Online Political Efficacy in China

open access: yesRegulation &Governance, Volume 20, Issue 1, Page 35-63, January 2026.
ABSTRACT Existing literature largely agrees that authoritarian regimes establish channels for political participation to gather valuable information on citizens' anti‐regime sentiments and policy preferences and to supervise lower‐level bureaucrats and firms.
Anton Bogs
wiley   +1 more source

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