Results 41 to 50 of about 173,692 (223)
He jishu在月球建立基地是人类探索太空的第一步，而为基地提供稳定可靠的能源是最重要的方面之一。与太阳能相比，核能具有高功率、比质量低、使用寿命长、可全天候供电等优点，是月球表面基地能源供给的理想选择。基于100 kWe的供电需求，设计了月球表面热管熔盐堆。使用SCALE 6.1开展了中子物理与屏蔽分析。基于热管的黏性极限、声速极限、携带极限、沸腾极限和毛细极限，采用热阻网络法模拟热管传热，并耦合计算流体力学方法进行了正常工况下全堆芯热工流体分析。分析结果表明：通过三分区堆芯布置可以展平功率 ...
刘 坤 +5 more
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Wildlife Letters, EarlyView.Tracking with GPS and accelerometers shows that great evening bats in subtropical China use two overwintering strategies: some remain in continuous hibernation, while others switch between torpor and activity as temperatures change. This behavioral flexibility, shaped by climate, underscores the importance of protecting diverse roosting habitats for ...
Zhiqiang Wang +7 more
wiley +1 more source
Fushe yanjiu yu fushe gongyi xuebao有机-无机杂化材料通过有机与无机组分的协同作用克服了单一材料的性能局限，实现了材料的高性能化和多功能化，但在制备过程中仍存在组分混合不均、孔隙率下降及相容性差等难题。辐射诱导技术通过调控能量传递与反应路径，为解决这些问题提供了有效途径。本文综述了辐射诱导法制备有机-无机杂化材料的研究进展：直接法利用γ射线、电子束等辐射源激发活性粒子（自由基、离子），驱动化学键重组，实现常温常压下快速合成，如Ag/PVA（聚乙烯醇）杂化水凝胶的绿色制备及ZIF-8@ZnO异质结构的光催化性能提升 ...
郭 正纲 +8 more
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, 2009 通过分析当前用户协作信息检索的相关理论和系统实践,总结其中存在的一些问题,确定用户同步协作检索中要解决的三个关键问题:检索任务的分配、群组查询历史的重用和协作感知,提出一个用户同步协作信息检索模型 ...
刘兰, 徐树维, 齐惠颖
core
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
wiley +1 more source
基于
He jishu近年来，全球对核电站可持续性和灵活性的需求日益增加，微型反应堆具备体积小、灵活性高、安全性高、适应性强、维护需求低等不可替代的优势，能够为大型电网无法覆盖的地区供电，因而成为核能方向的研究热点。SiC基车载式气冷微堆（SiC-based Vehicular Micro Reactor，SVMR）专为偏远地区提供电力服务，其堆芯设计紧凑，具有燃料装载能力强及高燃耗深度的优势。然而，由于反射层具有较强的中子慢化能力，大量中子经慢化后返回活性区边缘，致使该区域中子通量升高，功率密度显著增大 ...
张 方园 +5 more
doaj +1 more source
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Human‐driven landscape change, particularly urbanization, is reshaping pollinator communities, yet the functional traits that mediate species persistence remain poorly understood. Dietary specialization is commonly used to predict species vulnerability.
Yan Yang +5 more
wiley +1 more source
Fault diagnosis and fault-tolerant control for nonlinear systems with linear output structure [PDF]
, 2005 Article describes the process of fault diagnosis and fault-tolerant control for nonlinear systems with linear output ...
Shen, L., Wang, H., Yue, H.
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Most terrestrial plant species form symbioses with arbuscular mycorrhizal fungi (AMF). However, the below‐ground carbon (C) allocation of plants and the nutritional and growth benefits provided by AMF within this symbiosis vary greatly across species and environments ...
Hengjun Zhao +3 more
wiley +1 more source
He jishu熔盐堆是第四代核反应堆的候选堆型之一，对其关键运行参数进行精准预测，不仅可以揭示反应堆的运行状态，而且能够对异常工况提前预警，为操纵员提供决策支持和技术指导。为此，本文基于深度学习算法对熔盐堆关键参数开展预测研究，以期优化熔盐堆的运行状态监测效率并辅助决策过程。采用RELAP5-TMSR程序建立生成数据集的熔盐堆系统安全分析模型，基于自编码器（Autoencoder，AE）、长短时记忆网络（Long Short-Term Memory，LSTM）和门控循环单元（Gated Recurrent Unit ...
王 超群 +4 more
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