Results 111 to 120 of about 847,212 (208)

Decarbonization and the Rescaling of Water–Energy Bargaining: How Renewable Expansion Is Reshaping Iran–Iraq–Türkiye Transboundary Water Politics

open access: yesWorld Water Policy, Volume 12, Issue 4, November 2026.
ABSTRACT This article examines how renewable‐energy expansion is changing water–energy bargaining among Iran, Iraq, and Türkiye in the Tigris–Euphrates basin. Much of the existing literature on transboundary water politics focuses on territorial control, upstream–downstream power asymmetries, legal rules, and hydro‐hegemony but gives less attention to ...
Umud Shokri
wiley   +1 more source

微重力流体科学空间实验的分析和设想

open access: yes, 1988
本文通过回顾国外微重力空间实验的发展,着重分析研究发展趋向及微重力流体科学在空间材料科学中的地位。基于我们理论和地面实验工作基础,提出对微重力流体科学空间实验的一些设想。最后 ...
徐硕昌
core   +2 more sources

绿肥间作对渭北果园土壤水分、养分及苹果产量的影响

open access: yesShuitu Baochi Xuebao
目的研究渭北苹果园不同种类绿肥间作及其结合地布覆盖在土壤蓄水保墒、养分供给和果实产量提升方面的效应。方法设置黑麦草(R)、油菜(O)、苜蓿(A)3种绿肥和不覆地布(NG)、覆盖地布(G)2种覆盖方式,以清耕为对照(CK)。不覆地布+绿肥间作为主处理,覆盖地布+绿肥间作为副处理。在主处理和对照各小区分别设置15N田间示踪微区。探究苹果-绿肥间作系统土壤水分、养分及果实产量的响应。结果各处理土壤质量含水率均低于CK处理,GR处理下降幅度最小(1.7%)。主处理土壤水分差异率均为负值,其中NGR处理绝对值最低(
梁青   +5 more
doaj   +2 more sources

鸟兽合作趣谈

open access: yes野生动物学报, 1985
同一种类的动物成群地生活在一起,它们之间协力寻食、团结御敌是不足为奇的。这从非洲的斑马群,我国西南的金丝猴群,草原上凶猛的狼群,以至一窝蜜蜂或蚂蚁等等,都可作为明显的例子。然而,不同种类的动物之间是否也有相互合作,亲密为朋的关系呢?人们已从千鸟与暴戾的鳄鱼之间的密切关系作了肯定的回答。那么,鸟类和哺乳类(兽类 ...
张庆祥
doaj  

Beyond Evidence: How Framing Shapes Public Health Policies During Health Crises

open access: yesPolicy Studies Journal, Volume 54, Issue 4, November 2026.
ABSTRACT Does the level of evidence that accompanies policy action depend on how a problem is framed, and on who frames it? This article examines these questions in the context of health crises. Bridging sociological and equivalence framing theories, it treats frames as preexisting interpretive schemes shared within communities of actors, whose ...
Antoine Claude Lemor, Eric Montpetit
wiley   +1 more source

Who Owns the Landscape? Policy Conflict Over the Proposed Designation of Křivoklátsko as a National Park

open access: yesReview of Policy Research, Volume 43, Issue 6, November 2026.
ABSTRACT Nature conservation conflicts increasingly extend beyond ecological objectives to disputes over decision‐making legitimacy, institutional authority, and competing understandings of landscape and expertise. This article examines the conflict over the proposed designation of Křivoklátsko as a national park in the Czech Republic between 2021 and ...
Filip Simon
wiley   +1 more source

μ-闭包算子与LF-μ拓扑空间

open access: yes四川大学学报. 自然科学版, 2009
作者在LF拓扑空间中引入了u闭包算子,并由此定义了u闭集、u开集,从而导出了LF-u拓扑空间,然后作者讨论了由诱导的LF拓扑空间导出的u拓扑与原空间导出的u拓扑所诱导的LF拓扑之间的关系,并研究了相应于LF拓扑空间与LF-u拓扑空间之间的连续性、连通性、紧性与Urysohn分离性等拓扑性质。
陈丽
doaj  

In‐Situ Construction of Multi‐Scale Heterogeneous Structures in L‐DED IN718 Coatings via WMoTaNb Incorporation for Enhanced Strength‐Toughness Synergy

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT To improve the strength–toughness balance of IN718, and alleviate the brittleness commonly associated with refractory high‐entropy alloys, this study proposes a novel strategy to fabricate defect‐free IN718/WMoTaNb heterogeneous multiprincipal element alloy coatings via laser‐directed energy deposition.
Zhao Wang   +7 more
wiley   +1 more source

利用无消相干子空间实现原子间的二位逻辑门

open access: yes四川大学学报. 自然科学版, 2011
提出了一种在大失谐光学腔中实现两个原子间二位逻辑门操作的方案.通过受激拉曼作用使量子态在系统的无消相干子空间中演化,恰当选择原子与腔场的相互作用时间,从而实现受控非门和条件相位门操作.该方案不受原子自发辐射和腔场衰减的影响,在实验上更具可行性.
樊洋, 蒋治国
doaj  

《纪录片与媒体——25年之回顾与反思》

open access: yes, 2013
厦门大学图书馆“人文社科实验室” “学会活动”(62) 标题:《纪录片与媒体——25年之回顾与反思》 主讲人:时间 时间,先后为中央电视台《东方时空》、《九州方圆》等节目编导,后致力于纪实性纪录片创作,代表作《天安门》、《我毕业了》。首倡并推出了“真实再现”这一表现手法,代表作《周恩来》、《抗战》、《忘不了》、《南京的血证》等。现任中广协会纪录片委员会副会长,中央新影集团时间工作室总监,中央新影集团副主编。 内容: 以亲历者的身份,对25年以来 ...
时间
core  

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