Results 51 to 60 of about 24,262 (128)

Functional homogenization of terrestrial mammals outside protected areas in the Hengduan Mountains, China

open access: yesConservation Biology, Volume 40, Issue 3, June 2026.
Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li   +8 more
wiley   +1 more source

初探化学合成制粉工艺对ZnO压敏电阻U1mA/mm值的影响 附视频

open access: yesDianci bileiqi, 1998
用电子探针对比观测了采用化学共沉淀法制粉和机械混合法制粉的压敏电阻的微观结构;得出化学合成制粉工艺使压敏电阻U1mA/mm升高的原因是由于粉料组分的均匀分布使得其晶界组分的浓度均匀且高于机械混合制粉阀片中的晶界组分贫化区浓度,从整体上抑制了烧结过程中的晶粒长大。
费自豪   +4 more
doaj  

强化学习:迈向知行合一的智能机制与算法

open access: yes智能科学与技术学报, 2020
简要地评论了强化学习的历史、现状与未来的发展途径,认为强化学习应从先行后知、先知后行向知行合一的平行强化学习迈进,实现在虚拟世界“吃一堑”,在物理世界“长一智”,真正成为智慧机制和智能算法的基础学习理论。
王飞跃, 曹东璞, 魏庆来
doaj  

Scenarios and strategies for future‐proofing ecosystem management under climatic novelty

open access: yesConservation Biology, Volume 40, Issue 3, June 2026.
Abstract Climate change is driving unprecedented declines in dominant, habitat‐forming foundation species across marine and terrestrial ecosystems globally. As climatic novelty becomes the norm, ecosystem reassembly will become increasingly common. Predicting and understanding these transitions, and their implications for future ecosystem functioning ...
Lauren T. Toth   +14 more
wiley   +1 more source

Influence of case scenario simulation combined with Seminar teaching method on core competence of adult nursing students

open access: yesHuli yanjiu, 2016
[目的]利用网络平台和课堂教学,将案例情景模拟联合Seminar教学法应用在精神病护理教学,探讨其对成人教育护生核心胜任能力的影响。[方法]随机抽取我院成人教育2013级护生170人,分成对照组98人和观察组72人,对照组采用传统教学方法,观察组实施案例情景模拟联合Seminar教学法,采用理论考核、客观结构化临床考试(OSCE)和平时表现进行教学质量评价,应用自设问卷调查表评估教学效果。[结果]观察组精神病护理期末考核总成绩优于对照组 ...
张丹丹, 何平平, 王冬梅, 刘琼
doaj  

绝缘子瓷件物相分析测试及计算方法优化

open access: yesDianci bileiqi, 2023
对于电瓷材料,直接用K值法对X射线衍射(XRD)图谱进行物相定量分析,得到电瓷中的刚玉相、石英相、莫来石相以及玻璃相的含量与实际值会存在较大差距。针对这一问题,在分析电瓷内部各物相化学组成特点的基础上,结合XRD和化学成分分析结果,对电瓷中物相的分析测试及计算方法进行优化,最后用化学腐蚀试验对计算结果进行验证。结果表明,优化后的电瓷物相分析测试及计算方法适用于电瓷材料的物相定量分析。
袁志勇   +5 more
doaj  

A more‐than‐human political ecology of Indonesian songbird trade

open access: yesConservation Biology, Volume 40, Issue 3, June 2026.
Abstract Since its inception, conservation science has considered wildlife trade a problem. In focusing on conservation outcomes, conservationists almost completely ignore the welfare of traded animals and plants and the harms they endure. We developed a political ecology approach that incorporates the interconnectedness of people with animals and ...
Sicily Fiennes   +9 more
wiley   +1 more source

Evaluating Ballot Initiative Results for Adult‐Use Marijuana in Ohio: Understanding County‐Level Support

open access: yesPolitics &Policy, Volume 54, Issue 3, June 2026.
ABSTRACT In the 2023 November election, Ohioans voted in favor of Issue 2—the Marijuana Legalization Initiative. The successful passing of this initiative at the ballot box made Ohio the 24th state and largest Republican voting state to adopt a recreational adult‐use marijuana policy. Issue 2 was voted in favor of by a margin of 57% to 43%.
Gideon Cunningham   +2 more
wiley   +1 more source

复合绝缘子硅橡胶伞裙老化状态评估方法综述

open access: yesDianci bileiqi, 2022
随着复合绝缘子运行数量和时间的增加,并长期承受电场、机械负荷和复杂多变的环境作用,其硅橡胶伞裙的老化问题日益突出,威胁了电网的安全稳定运行。结合笔者的研究成果,从传统和新的老化评估方法两个方面,综述了当前复合绝缘子硅橡胶伞裙的老化评估进展。传统方法包括外观检查、喷水分级法、静态接触角法及红外热像法等。这些方法比较简便、直观,但主要涉及复合绝缘子老化引起的外在表现,无法提出材料老化的量化参数。老化评估新方法包括扫描电子显微镜、热重分析、傅里叶红外光谱以及热刺激电流法等 ...
曾磊磊   +11 more
doaj  

砂化岩体在开挖干扰下弹塑性损伤数值模拟

open access: yes四川大学学报. 自然科学版, 2013
以连续介质力学和不可逆热力学为基础,求解砂化岩体损伤演化方程,并将损伤引入到修正的弹塑性本构方程中,提出了适用于砂化岩体的弹塑性损伤三维有限元计算方法.该方法反映砂化岩体在开挖施工干扰下的岩体破坏过程.应用该方法进行数值模拟计算了坪头水电站引水隧道1#竖井开挖过程,分析成果与实际情况较为吻合,验证了该分析方法的合理性,为砂化岩体计算提供了理论依据.
熊清蓉, 肖明, 胡田清
doaj  

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