Results 61 to 70 of about 1,468,446 (165)
Zhongshan Daxue xuebao. Yixue kexue ban, 1995 应用心内电生理检查。对９例可诱发持续性室上性心动过速（ＳＶＴ）病人进行电药理学试验，结果发现：静脉注射普罗帕酮延长房室及室房传导间期，延长房室及室房传导系统功能不应期，使８／９病人不能再诱发持续性ＳＶＴ；静脉滴注异丙肾上腺素（ＩＳＯ）能逆转普罗帕酮的电生理作用，并使１／８病人重新诱发持续性ＳＶＴ，５／８病人非持续性ＳＶＴ的持续间期延长，ＩＳＯ逆转普罗帕酮效应能被普萘洛尔阻断。研究提示，在交感神经兴奋状态下，即使口服经临床电药理学试验证实有效的药物，部分病人仍可能复发ＳＶＴ ...
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Regulating oxygen vacancies (Ov) in SnO2 to facilitate high‐efficiency carbon dioxide electroreduction reduction reaction (CO2RR) is still a significant challenge. Therefore, a strategy based on Ag‐induced interfacial electron transfer was proposed to modulate Ov in SnO2 for CO2 electroreduction. The prepared Ag/SnO2 with an optimal Ov content
Haoyu Qi +7 more
wiley +1 more source
, 1997 本文试图从不同角度阐述可持续发展理论与生态学基本原则的内在联系。工业文明后期引发的生态危机唤醒了人们的环境意识，促使可持续发展思想逐步形成。可持续发展理论最早是由环境学家和生态学家提出来的。自然生态系统“整体、协调、循环、再生”的运行法则给人类以莫大的启迪，并成为可持续发展的理论基础。人与自然的关系是可持续发展的核心问题，经济系统与生态系统的协调 ...
李辛夫
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四川大学学报. 自然科学版, 1999 传统的隐马尔可夫模型的缺点在于不能很好地描述语音信号的动态特性．某些改进算法引入状态持续时间进行修正，但是也削弱了对实时信号长度变化的适应性．作者在传统的隐马尔夫模型的基础上，通过在引入状态持续时间时，将其归一化，并观察序列长度对它的影响，使之能较好地描述语音信号的动态特性，同时也能较好地自适应描述实时语音信号的长度变化．讨论了具体的算法，并给出了实验数据．结果表明，采用归一化状态持续时间隐马尔可夫模型的语音识别系统能较好地改善传统的隐马尔可夫模型在动态特性方面的不足．
王可, 王翠梅
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Assessing and strengthening community‐based coastal governance
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Community‐based coastal governance is essential for biodiversity conservation and sustainable livelihoods, yet many communities continue to face significant challenges in establishing and sustaining effective governance systems. We sought to improve understanding of the current status of community‐based coastal governance across five countries
Mark Andrachuk +21 more
wiley +1 more source
Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
, 2001 本文以生态经济学理论为基础，以农业经济学、资源经济学、环境经济学、决策学的基本原理为指导，从实事求是的科学态度出发，］以大量的事实为依据，从系统的观点，动态的角度分析了农业可持续发展的起源、经验教训、发展的必然性，结合国外农业的研究探讨了农业可持续发展的涵义、目标、不同观点及产生背景 ...
彭珂珊
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Shiyou jixie, 2011 分析夹持块与连续管的作用机理、研究两者的应力分布规律对降低其疲劳破坏和延长其使用寿命具有重要意义。对夹持块内连续管力学模型的建立做了初步探索，以弹性力学经典厚壁筒理论为基础，计算出夹紧段连续管内、外壁应力，同时采用分析软件ANSYS对夹持块与连续管进行了接触非线性有限元分析，并对两者的计算结果进行对比。分析结果表明，夹持块夹紧力均匀分布的假设不正确，采用API常规力学模型计算连续管应力误差显著；在精确有限元接触模型及准确的边界条件和初始条件的前提下，采用接触有限元法可以得到比常规计算方法更为精确的结果 ...
刘清友, 瞿丹, 祝效华, 黎伟
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Green Hydrogen in Brazilian Media: Dominant Narratives and Missing Dimensions of the Energy Trilemma
Politics &Policy, Volume 54, Issue 5, October 2026.ABSTRACT Media discourses help shape the visibility and legitimacy of energy transition pathways in the public sphere. This study examines how Brazilian mainstream newspapers framed green hydrogen and assesses the alignment of these narratives with the energy trilemma: energy security, environmental sustainability, and social accessibility. We analyzed
Flávia Mendes de Almeida Collaço +3 more
wiley +1 more source
, 2003 环境与发展的关系问题是可持续发展的核心问题。竺可桢以中国的农业社会背景为思考的始点、从地理学的视角、基于对环境的长时段考察,用毕其一生对中国的发展与环境问题作出了深刻的思考和探讨,得出应在发展中保护自然的论断。由此,本文认为 ...
孙承晟
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