Results 41 to 50 of about 847,250 (203)
, 1997 本文依据赣东北鱼类区系的特征，结合古地史资料，从历史时空的角度分析其区系的形成和演化；进而对我国东部地区淡水鱼类动物地理区划进行了讨论并指出：赣东北以及整个长江中下游地区应隶属于东洋区；南岭──武夷山──天台山──仙霞岭可构成东洋区南东亚亚区内次一级地理区划的分界线，即华东小区和华南小区的分界线；洞庭湖水系、鄱阳湖水系和钱塘江水系应享有相同的区划级别 ...
张鹗,陈宜瑜
core +2 more sources
全球能源互联网, 2019 伴随风电大规模接入电网，其不确定性为电网的决策调度带来了新的挑战，风电消纳评估由此成为研究热点之一。以不确定集合表征风电不确定性，建立了两阶段鲁棒优化模型，以解决电-热综合能源系统的风电消纳能力评估问题。主问题基于风险指标优化风电可消纳域，并在算法处理中引入分段线性化处理非线性的风险表达式；子问题引入风电可接纳判据寻求风电不确定集合中的极端场景。最后着重比较电-热综合能源系统与电力系统的风电消纳能力差异。
巩志皓, 王程
doaj +1 more source
Advancing conservation breeding programs for marine invertebrates
Conservation Biology, EarlyView.Abstract In the face of ecosystem change and biodiversity loss caused by climate change and other stressors, conservation breeding, or captive breeding, with the aim of reintroduction for wild population recovery, is an emerging tool for preventing species’ extinction and rehabilitating ecosystems.
Elora H. López‐Nandam +3 more
wiley +1 more source
Taxonomic and functional diversity of urban bees of the world
Conservation Biology, EarlyView.Abstract Bees play a pivotal role in terrestrial environments. Urbanization can affect these organisms and the ecosystem services they provide. However, knowledge of the global diversity of urban bees is limited. Thus, we summarized data on urban bee species identities and occurrences; compared distributions of all bees with those found in urban ...
João C. F. Cardoso +10 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 1999 用INDO方法研究了氮杂与硼杂碳笼CnX(n=59,69;X=N+,B-)的电子结构和光谱,表明CnX与C60,C70相比将发生结构畸变,氮杂碳笼比硼杂碳笼稳定,C70中靠近极附近的两种C原子易被杂原子置换.本文在对电子跃迁进行理论指认的同时,讨论了光谱红移的原因.
TENGQi-wen(滕启文), WUShi(吴师)
doaj +1 more source
全球能源互联网, 2019 当前中国正处在能源结构转型的关键阶段，传统能源结构的利用效率受限，多种能源相互协同发展受阻，经济效益也徘徊在较低水平。以能源革命为背景，发展综合能源系统是能源结构转型的重要组成部分。其以智能电网为核心枢纽，结合电网、天然气网、热传输网以及多能耦合设备，利用多种能源的耦合性和互补替代性，不仅可弥补可再生能源的间歇性和随机性波动等问题，也可加强供给侧和需求侧的相互响应，提高综合能源利用效率，通过协同方式实现资源的最佳配置。目前中国综合能源系统示范工程大多在工业园区落成，因此围绕工业园区综合能源系统这一背景 ...
蒋超凡, 艾欣
doaj +1 more source
Twelve principles for successful governance of community‐based coastal marine restoration
Conservation Biology, EarlyView.Abstract Global agreements, such as the Global Biodiversity Framework, call for urgent, large‐scale action to halt biodiversity loss through a whole‐of‐society approach. Community‐based restoration can play a crucial role in achieving this goal, yet there remains limited understanding of what makes these projects effective and sustainable.
Michelle M. Holian +2 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 1999 对Sr原子5snd1D2(n=22～27)，｜m｜=0,1,2各Rydberg态的场电离阈作了实验测定和理论计算.讨论了原子场电离过程中的能级Stark位移，电离的绝热或非绝热路径以及环境热辐射等因素对场电离可能产生影响.
QIUJi-zhen(邱济真), LIJing(郦菁)
doaj +1 more source
Conservation Biology, EarlyView.Abstract Reversing ongoing biodiversity loss requires effectively managing anthropogenic threats. Although conservation actions can mitigate these threats, prioritizing and targeting such actions remain challenging because species respond differently depending on the nature of the threats and their biological traits.
Camila Guerrero‐Pineda +3 more
wiley +1 more source
Conservation Biology, EarlyView.Abstract Modeling species distributions in dynamic pelagic environments remains challenging, particularly for wide‐ranging and highly mobile species when there is limited guidance on model performance. This limitation constrains the effective use of species distribution models (SDMs) in marine conservation, where robust and transferable predictions are
E. Pasanisi +32 more
wiley +1 more source