Results 11 to 20 of about 28,511 (200)
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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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
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He jishu神经网络可以基于大量数据学习输入输出变量之间的关系，具有强大的拟合能力，在包括核工程计算领域常用作程序的代理模型。中子输运计算作为中子学模拟的核心环节之一，其耗时较长的问题可以利用神经网络模型来解决。然而，神经网络模型具有一系列超参数需要设置，而手动调节这些超参数工作量大，重复繁琐，只能依靠经验进行，而且求解不同问题时这些超参数不可复用。为了解决以上问题，本文提出了一种采用贝叶斯优化（Bayesian Optimization）的算法来调节神经网络超参数，结合了自适应学习率衰减、损失函数优化方法 ...
张 凡 +5 more
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Dizhen xuebao, 2022 基于搜集到的2000—2018年滇西北地区MS≥3.0地震的震源机制解，运用线性叠加反演法进行应力场反演，分析了滇西北地区现今的构造应力状态，进一步探讨了应力张量方差的时空分布与地震活动的关系。结果显示：① 滇西北地区地震的震源机制解类型复杂，主要以走滑型（46%）为主，正断型（27%）次之；② 研究区的构造应力场具有整体的一致性和局部的非均匀性，呈现为NNW向挤压和ENE向拉张的走滑型应力结构，说明研究区受到来自NNW向的水平挤压作用，对该地区上地壳运动和断裂活动起主导作用；③ ...
Wenjie Fan, Xiaofeng Cui, Xiaoyan Zhao
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Integrative Conservation, EarlyView.This research reveals the functional stability of mixed species foraging flocks (MSF) and their foraging height change with different taxonomic differences along the elevational gradient at Knuckles Montane Reserve, Sri Lanka. This offers new insights into how MSFs sustain with the elevational gradients supporting the altitudinal shifting species ...
Vimukthi. R. Gunasekeara +3 more
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Integrative Conservation, EarlyView.Pometia pinnata demonstrated life‐stage‐specific genetic responses to landscape features, with asymmetric gene flow patterns and population recovery following historical bottlenecks, revealing complex topographic and demographic influences on forest genetic structure.
Madhuparna Chatterjee +5 more
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Integrative Conservation, EarlyView.The Asian Songbird Crises negatively affects so‐called master birds, species that are used to increase the song complexity of competitive songbirds. We assessed the trade in a master bird, the crested jayshrike, in Indonesia before and after its legal protection.
Vincent Nijman +11 more
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He jishu针对由形状记忆合金制作的新型搅混翼的强化换热效果及其影响下的燃料棒微动磨蚀问题，利用双向流固热耦合的方法模拟了新型搅混翼下的流场分布、压降损失及燃料棒受力情况，并建立了燃料棒受力的非线性振动模型，计算了燃料棒相对于定位格架的微动磨蚀功率。结果表明：形状记忆合金搅混翼可不产生额外的压力损失而强化燃料棒与冷却剂间的传热；强化传热效果随着搅混翼的最大弯折角度的增大而增大；同时，燃料棒与定位格架间的微动磨蚀功率随着搅混翼的弯折角度增大而增大。
袁 硕, 柴 翔, 刘 晓晶, 何 辉
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Integrative Conservation, EarlyView.We collated detections of the sun bear from new and previously published camera trap studies across its range. We then analysed these detections at two different spatial scales to assess the habitat associations and diel activity of this species. We found that the sun bear is tolerant to moderate habitat disturbances. ABSTRACT Degraded tropical forests,
Alexander Hendry +5 more
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Impacts of Human Development on Wildlife Use of Corridors in Botswana 人类开发对博茨瓦纳野生动物廊道利用的影响
Integrative Conservation, EarlyView.This study examined the effect of landscape‐scale human impact on wildlife in Botswana. We examined how species use wildlife corridors in two different human‐dominated landscapes. We identified differences in temporal overlap between wildlife and humans across both landscapes, which is fundamental to consider in both current and future conservation ...
Tempe S. F. Adams +3 more
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