Results 11 to 20 of about 12,594 (182)
Growing Demand and Uneven Supply: Eight Years of Nature Education in China 需求增长与供给不均:中国自然教育八年发展回顾
Integrative Conservation, EarlyView.ABSTRACT This study examines the role of nature education in advancing conservation and sustainability in China between 2014 and 2023. Drawing on national survey reports and historical–comparative methods, it analyses the dynamics of public demand, institutional supply, and practitioner capacity.
Qi Yunxi, Lyu Xiang, Huang Yu
wiley +1 more source
Probability Safety Analysis of Simplified CPR1000 Main Feedwater System and AP1000 Passive Containment Cooling System [PDF]
, 2016 随着数字化仪控系统在核电厂中得到越来越多的应用，其可靠性对核电安全也越来越重要。传统概率安全分析方法已在模拟仪控系统中得到广泛应用，但在分析具有新设备和新技术的数字化仪控系统时还存在不足。动态概率安全分析方法中，Markov/CCMT是较为符合数字化仪控特性的概率安全分析方法之一。 本文主要是应用故障树、Markov和Markov/CCMT三种方法对简化CPR1000主给水系统和简化AP1000非能动安全壳冷却系统分别进行安全分析，其中简化CPR1000主给水系统在设置故障时偏重于数字类故障 ...
侯恩通
core
Rare Metals, EarlyView.ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He +9 more
wiley +1 more source
The Research on the Performance and Preparation of High Temperature Lanthanum Doped Molybdenum Wire for Automotive Lamps [PDF]
, 2016 作为汽车灯用导杆，钼与玻璃封接是一项很特殊的应用，被用于不同封接方式的钼导杆，对其质量与性能有不同的要求。 钼导杆表面质量、裂纹及高温性能是玻璃封接过程需要控制的三个关键参数。例如，钼导杆与石英玻璃封接要承受将近1700℃的封接温度，这就要求钼导杆具有良好的高温性能；当它与硬质玻璃封接时要钼导杆贯通灯体，这就要求材料表面不能存在缺陷及裂纹，以达到密封完好、不漏气。 本文对汽车灯用高温钼镧丝的制备工艺及性能进行研究，并建立了工艺控制规范和产品标准。本研究工作和取得的成果主要包含以下几个方面： 首先 ...
张丁旺
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Success of restoration strategies in preventing extirpation of 2 critically endangered coral species
Conservation Biology, EarlyView.Abstract An unprecedented marine heatwave in 2023 caused widespread coral bleaching and mortality throughout the Caribbean. In the Florida Keys (USA), 2 foundation species, elkhorn coral (Acropora palmata) and staghorn coral (Acropora cervicornis), were severely affected.
Erinn M. Muller +29 more
wiley +1 more source
Failure analysis of four tube in power station boiler [PDF]
, 2015 火力发电厂是我国供电主体，约占总体发电量的70%。大型火电厂的安全事关电网的安全运行，而火电厂中的锅炉运行的可靠性是影响发电厂运行可靠性的首要因素，尤其是锅炉四小管的损坏泄漏对机组的安全运行影响最大，是火力发电厂的常见事故，一般占机组故障的60%-70%。锅炉经常由于四小管设计、制造、安装、运行、修理改造、管理等环节的问题以及长期在高温、高压、腐蚀、冲刷等恶劣条件下运行等原因而造成爆管并导致停炉。只有掌握四小管各种类型爆管的失效机理，才能有的放矢开展监督检验工作，寻找有效的管理和技术防治对策 ...
左仁红
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Evolution of research on global amphibian declines
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract In the late 1980s, the scientific community became aware of severe, enigmatic amphibian population declines. These declines triggered a wave of research focused on quantifying their extent and identifying key drivers. We used text‐analysis techniques, including topic modeling and geoparsing, to examine the evolution of research focused on ...
Jordann Crawford‐Ash +6 more
wiley +1 more source
Discussion on the Improvement of the Reliability of Electromagnetic Relay [PDF]
, 2016 电磁继电器作为一种自动控制电气开关，广泛运用于各种控制电路中。当给予一个较小的信号输入量，如电、磁、光、热等信号时，它能够使被控制的电路实现自动切换。电磁继电器同时也是一种失效率较高的电子元器件，因其导致整机可靠性水平较低的问题历来受到广泛重视，如何提升继电器的可靠性是继电器制造企业一个非常重要的课题。尽管继电器是最早被用于可靠性研究的电子元器件，但由于历史原因，其研究对象主要限定在应用于航天航空领域的密封继电器，而那些应用于家电类继电器，因属于民用功率继电器，且价值相对较低，其可靠性研究被关注的较少 ...
江长流
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT TA18 alloy is an ideal material for piping systems in the aerospace field, the low notch sensitivity and high damage tolerance enhance its engineering application value. However, the complex failure mechanism influenced by strain gradient necessitates further improvement of the service stability for TA18 alloy in practical engineering ...
Xin Du +6 more
wiley +1 more source
Dianci bileiqi, 1995 绝缘子产品的可靠性（续五）丘志贤（西安电瓷研究所西安７１００７７）（上接《电瓷避雷器》１９９５年第５期第３４页）７．３直流线路盘形悬式瓷或玻璃绝缘子失效机理直流线路上盘形悬式瓷或玻璃绝缘子失效的机理很多，下面举出几个被有关实验室证实过的失效机理。７．...
丘志贤
doaj