Results 41 to 50 of about 173,183 (227)
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
doaj +1 more source
Wildlife Letters, EarlyView.Using a 3‐year, broad‐scale camera‐trap network in western Kansas, we tested whether coyotes and American badgers exhibit spatiotemporal patterns consistent with coordinated hunting. Despite high diel activity overlap, detection‐conditioned co‐detections occurred far less frequently than expected under independence, and short‐term temporal sequencing ...
Ty J. Werdel +3 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
doaj +1 more source
, 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
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo +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
Greenhouse gas emissions from croplands of China [PDF]
, 2003 China possesses cropland of 1.33 million km 2. Cultivation of the cropland not only altered the biogeochemical cycles of carbon (C) and nitrogen (N) in the agroecosystems but also affected global climate.
Bohan, Liao +13 more
core +1 more source
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
Design and Implementation of Multi-Industry Application Platform Based on IC Card of PBOC for the City Commercial Banks [PDF]
, 2016 根据中国人民银行要求，金融IC卡的推广坚持“政府引导、市场运作、统一标准、鼓励创新”的原则。对金融IC卡全面推广进行政策指导和协调，推动跨行业支付应用的IC卡使用金融标准，以行业多应用为落脚点，鼓励金融IC卡应用的创新发展，不断探索满足产业新业态、应用新模式带来的发展需要。 本文基于目前城市商业银行金融IC卡业务创新，资源整合等需求，设计金融IC卡多应用平台（以下简称多应用平台），该系统是通过IC卡芯片内CAP包的分区，二次个人化信息芯片信息 ...
黄亚杰
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric imbalance caused by nitrogen (N) deposition typically exacerbates phosphorus (P) limitation in plants. However, it remains unclear whether this effect extends to soil microbes, particularly those in the rhizosphere.
Jipeng Wang +5 more
wiley +1 more source