Results 121 to 130 of about 71,602 (282)

微囊藻休眠体复苏机制的研究进展 [PDF]

open access: yes, 2010
围绕我国淡水水体中最常见水华优势种-微囊藻(Microcystis)其休眠体复苏机制国内外主要研究进展进行了介绍及评述。涵盖了微囊藻休眠体越冬过程中细胞形态及结构变化和光合活性及生理代谢变化;介绍了微囊藻休眠体在复苏过程中的主要环境影响因子;并指出了今后新方法 ...
万能, 宋立荣, 汤俊
core  

Transnationalizing Raciolinguistics: An Intersectional Analysis for Understanding Chinese International Students’ Language Ideologies Across Contexts

open access: yesJournal of Sociolinguistics, EarlyView.
ABSTRACT This study adopts a transnational raciolinguistic perspective to examine how Chinese international students (CISs) navigate language, race, and identity across borders and contexts. Based on semistructured interviews with 14 CISs, the study highlights that pre‐migration socialization in China influences how CISs perceive and interpret their ...
Gengqi Xiao, Hailing Wang, Jing Yu
wiley   +1 more source

光纤光缆特性及测试方法研究的最新进展

open access: yesGuangtongxin yanjiu, 2001
介绍 2 0 0 1年 2月在日内瓦召开的 ITU- T第十五研究组会议关于光纤光缆特性及测试方法研究的最新进展 ...
程铭
doaj  

Mechanistic Study on Selenite Absorption and Metabolism Promoted by Exogenous Nitric Oxide in Rice Seedling Roots [PDF]

open access: yes, 2015
硒(selenium,Se)作为人和动物的必需元素之一,有非常重要的生理功能。可食性植物是人和动物的主要硒源,探索植物硒累积分子机制以及寻找提高植物硒含量的策略具有重要现实意义。 一氧化氮(nitricoxide,NO)作为一种重要的生物信号分子,在动植物体内起着重要的作用。低浓度NO对植物的生长发育以及多种逆境胁迫抗性具有重要影响。已有部分研究表明硒能引起植物体内NO的变化,且NO能缓解硒诱导的水稻脂质过氧化,但目前关于NO对硒吸收代谢调控的分子机制研究尚未报道。本文以重要的粮食作物水稻 ...
李秀玲
core  

Accountability in Government Use of AI: Citizen Concerns and Preferences

open access: yesPublic Administration, EarlyView.
ABSTRACT Government adoption of AI opens the “pandora's box” of accountability, a core aspect of public value. Despite the centrality of governmental AI accountability, citizens' concerns and preferences in holding governments accountable for AI usage remain poorly understood.
Naikang Feng, Yanto Chandra
wiley   +1 more source

电压水平对交流恒压下油楔放电发展及击穿过程的影响

open access: yesGaoya dianqi, 2019
为实现通过局部放电检测来准确诊断电气设备绝缘缺陷并对危险放电状态进行预警,文中对模拟电力变压器绕组匝间和饼间局放缺陷的油楔放电模型,采用恒压法和全实时高频/特高频联合检测系统,对其发展至击穿全过程的局放信号进行了研究。通过改变外施电压,研究了电压水平对油楔放电发展进程的影响;总结了不同电压下油楔放电发展全过程特征参数的变化规律,提出了放电阶段状态划分的方法和原则;从机理的角度对不同阶段的放电机制进行了解释。研究表明,恒压下,不同电压水平油楔放电均存在平稳发展和加速劣化发展两种典型阶段 ...
李金忠   +4 more
doaj  

Exploration for effects of acoustic stimulus on movement behavior and HSP70 expression of two kinds of marine crustaceans [PDF]

open access: yes, 2016
水下噪声会潜在的引起海洋生物紧张,分散和掩蔽这些海洋生物重要的声信号,进而对海洋生物的行为和生存造成影响。近几十年来,随着人类社会的不断发展,人们将发展目光投向了占有全球71%面积的海洋。伴随海洋事业的快速发展,海洋工程噪声对海洋生物的影响引起了人们的极大关注。虽然目前已有不少研究成果评估了水下工程噪声对海洋生物的影响,这些噪声包括轮船、打桩、地震勘探以及风电场等水下噪声,表明海洋工程等人为噪声对鱼类以及海洋哺乳动物都将造成了不同程度的影响和伤害。但是 ...
周韦峥嵘
core  

How Different Patterns of Policy Attention Drive Policy Diffusion: Evidence From China's River Chief System

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Despite extensive research on policy diffusion, the ways in which policy attention influences this process remain underexplored. This study addressed this gap by distinguishing between three types of policy attention—political speeches, policy issuance and field visits—and investigating their differential impacts when delivered by central and ...
Xiangning Chen, Yahua Wang
wiley   +1 more source

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