Results 31 to 40 of about 3,991,776 (211)
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen +9 more
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Geometric methods in the modeling of robot mechanisms(机器人机构建模的几何方法)
Zhejiang Daxue xuebao. Lixue ban, 2006 讨论了经典力学系统中拉格朗日方程的黎曼几何表示（黎曼流形上的牛顿力学）和力学系统拓扑图表示之间的关系，作为应用，讨论了机器人系统的拓扑图表示和动力学模型计算等，与已有的机器人动力学分析办法相比，基于黎曼几何和拓扑图表示方法的动力学分析更加简便，更加适合机器人动力学机械化（自动）建模.
GENGGui-bo(耿贵波) +2 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang +10 more
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Looking at Us Through Their Eyes. The Analytical Process from Ethnographic Perspectives1
Journal of Analytical Psychology, EarlyView.Abstract This article looks at the analytical situation through the Others’ eyes—through examples from contemporary ethnographies of foreign cultures. It discusses the following issues: a) The analogy between the ontological worlds of the dead, ghosts, animals and dreams in “primitive populations” and the analytical psychological descriptions of the ...
Stefano Carta
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He jishu为研究压水堆一回路堆芯污垢中放射性物质的产量和分布情况，以典型压水堆（Pressurized Water Reactor，PWR）一回路为研究对象，针对一回路中的放射性物质，建立了污垢沉积及放射性物质的产量分布预测模型。模型对污垢沉积和放射性物质的预测结果与污垢仿真程序CRUDSIM（Chalk River Unidentified Deposits SIMulation）的计算结果差异小于5%。在此基础上，分析了冷却剂流速、氢气含量和冷却剂入口温度的影响。结果表明 ...
王 世伟 +3 more
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Methods in Ecology and Evolution, EarlyView.Abstract Elliptic Fourier analysis (EFA) is often employed in geometric morphometrics (GM), but the normalization of elliptic Fourier descriptor (EFD) has persistently posed challenges for obtaining unique and comparable results, especially in the application of outline‐based GM methods, which limits the implementation in automated analysis of numerous,
Hui Wu +6 more
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He jishu铅铋堆蒸汽发生器发生传热管破裂事故（Steam Generator Tube Rupture，SGTR）后，二次侧高压过冷水将喷放进入一次侧的高温铅铋熔融物中。该现象可能的后果有铅铋凝固，压力波造成堆内构件损坏以及蒸汽迁移进入堆芯引入意外反应性。为了研究该过程，上海交通大学先进核能系统实验室搭建了大型铅铋-水反应实验装置台架。在实验开始前，针对该台架预先开展计算流体动力学（Computational Fluid Dynamics，CFD）计算以认识实验现象并确定实验工况 ...
邓 畅, 张 林, 刘 晓晶
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The collective application of shorebird tracking data to conservation
Conservation Biology, EarlyView.Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison +71 more
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, 2016 编者按：2016年3月31日,南京航空航天大学 王同光教授，在中国科学院流固耦合系统力学重点实验室2015年度学术年会上，做了题为《大型风力机的空气动力学问题》的邀请报告。承蒙作者盛意，本刊在此发布，以飨读者。 王同光教授在工作中 作者简介：王同光，现为南京航空航天大学教授，博士生导师。江苏省风力机设计高技术研究重点实验室主任，江苏省“风能和太阳能发电技术与工程”优势学科带头人，国家973计划项目“大型风力机的空气动力学基础研究”和“
王同光 +1 more
core
Re-study on the two-step chemical reaction model in numerical simulation of gaseous detonation
, 2009 采用改进的高精度时-空守恒元解元算法(the space-time conservation element and solution element method,CE/SE method)和考虑组分的二阶段化学反应模型(Sichel的二步模型)对气相爆轰问题的数值模拟进行了分析.分析发现采用Sichel的二步模型得到的数值结果虽然比早期二阶段化学反应模型(旧二步模型)更接近实验值,但是仍然不能得到爆轰过程准确气体动力学参数.为此通过修改组分的质量分数分布形式对Sichel的二步模型进行了改造 ...
王刚, 刘凯欣, 张德良
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