Results 91 to 100 of about 43,443 (203)

极紫外光电效应电荷驱动仿真与试验验证

Kongjian kexue xuebao
惯性传感器中的检验质量是精密引力测量系统中的核心, 其表面会因为宇宙高能粒子持续注入而积累电荷, 在惯性传感器内部电磁场作用下产生杂散噪声, 影响精密引力测量结果. 根据光电效应原理, 用UV LED产生极紫外光照射惯性传感器的电极与检验质量表面, 并在电极间施加适当电场, 就可以在不引入外力作用且无接触条件下改变检验质量的电荷量. 本文基于平行板电容器的简化电极模型, 对极紫外电荷驱动过程进行了理论建模仿真.
王 子栋, 周 斌
doaj   +1 more source

Changes of Potential Suitable Areas for Lynx Under Climate Change in Mohe Area, Daxing'anling Mountains, China 气候变化下中国大兴安岭漠河地区猞猁潜在适宜区的变化

Wildlife Letters, EarlyView.
Climate change drives shifts in suitable habitats for Eurasian lynx and its prey (hare, roe deer) in Mohe, Daxing'anling Mountains. Under RCP scenarios, moderate warming (RCP4.5) promotes substantial habitat expansion, while high‐emission conditions (RCP8.5) lead to strong expansion in the 2050s but slower gains and partial contraction by the 2070s ...
Binglian Liu, Dan Ju, Hong Chen, Qi Qi, Geng Liu, Shaochun Zhou   +5 more
wiley   +1 more source

基于机器学习方法的CSNS加速器智能值班员样机系统

He jishu
中国散裂中子源（China Spallation Neutron Source，CSNS）作为一个用户装置，其稳定运行对科学研究的顺利开展具有重要意义。然而，由于加速器系统的高度复杂性，传统的基于阈值的报警机制在应对复杂和多样化的异常时表现出明显的局限性，部分未能及时检测的异常可能引发束流联锁，降低运行效率和稳定性。为了解决这一问题，本文提出了一种基于机器学习的异常检测方法，并开发了CSNS加速器智能值班员样机系统。该系统通过特征工程和无监督学习算法，能够实时监测运行数据并精准识别复杂异常 ...
彭 娜, 张 玉亮, 程 司农, 何 泳成, 梅 昊, 王 林, 薛 康佳, 李 明涛, 吴 煊, 朱 鹏, 黄 蔚玲   +10 more
doaj   +1 more source

Using Harvest Data to Assess Factors Influencing Regional Population Declines of Muskrats (Ondatra zibethicus) 利用捕获数据评估影响麝鼠 (Ondatra zibethicus) 区域种群数量下降的相关因素

Wildlife Letters, EarlyView.
Reported annual per‐capita harvest of muskrats (PCHM) decreased as wetland complexity (total number of wetland patches) decreased in 13 state and federal wetland areas in the Midwest, USA. Our results support the hypothesis that regional‐scale declines in the abundance of muskrats are likely associated with the losses to wetland habitats throughout the
Tim L. Hiller, Andrea Sylvia, Jesse T. Boulerice, Adam A. Ahlers, Dwayne R. Etter, Eric M. Dunton   +5 more
wiley   +1 more source

Conflict Social Networks of Critically Endangered Alpine Musk Deer in Captivity and Relationships With Fecal Steroid Hormones 圈养极危物种马麝的冲突社交网络及其与粪便类固醇激素的关联

Wildlife Letters, EarlyView.
We conducted a grouping study on 52 adult musk deer to investigate whether group sex composition modulates aggressive behavior and stress response in captive musk deer. We found that the conflict interactions of all‐male groups were significantly more than those of mixed groups, and compared with the mixed groups, the conflict interactions of all‐male ...
Xiaolong Wang, Jingqi Yang, Xiaoping Lu, Hong Ye, Wei Huang, Xiuxiang Meng   +5 more
wiley   +1 more source

Acoustic Mimicry of Begging Calls and Its Geographical Differentiation in Nestling Common Cuckoos Toward Oriental Reed Warblers 大杜鹃雏鸟对东方大苇莺乞食鸣叫声的声学模仿及其地理分化

Wildlife Letters, EarlyView.
Common cuckoo nestlings from different populations show varying degrees of mimicry of warbler begging calls, with the Yongnianwa population being the most accurate and the Zhalong population the least. Overall, these cuckoos employ a dual strategy: they conservatively mimic the high‐frequency components of host calls while adaptively adjusting their ...
Jiaojiao Wang, Lumeng Xu, Canchao Yang
wiley   +1 more source

Precipitation‐mediated asymmetric fitness consequences of nectar robbing in distylous Primula florindae

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Flowers with deep corollas are frequently associated with nectar robbing, a behaviour that often reduces pollen transfer and seed production. Robbing scars, however, may further affect plant reproductive success through rainwater entry into corolla tubes.
Wu Sun, Judith Trunschke, Run‐Dong Shi, Hao Wang, Chang‐Yun Zheng, Zi‐Lin Xu, Jie Zhang   +6 more
wiley   +1 more source

The oxygen uptake capacity of freshwater fish evolves to favour hypoxia tolerance in lentic species but locomotion capacity in lotic species

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Oxygen supply capacity (α) is a physiological trait hypothesized to shape the metabolic niche and biogeography of aquatic breathers, yet how natural selection targets α remains unclear.
Na Zhang, Yong‐Fei Zhang, Ping Xiang, Yan Tang, Cheng Fu, Xu Pang, Shi‐Jian Fu   +6 more
wiley   +1 more source

Shrubs benefit from being functionally more conservative and distinct from neighbour trees

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Multi‐strata forests can enhance ecosystem functioning, with interactions between overstorey trees and understorey shrubs playing a pivotal role. However, how the structure and composition of neighbouring trees, together with shrub traits, influence shrub growth remains
Sai Peng, Chen Chen, Helge Bruelheide, Pablo Castro Sánchez‐Bermejo, Anpeng Cheng, Xianglu Deng, Sylvia Haider, Shan Li, Yi Li, Ting Tang, Yujie Xue, Haoru Yan, Bo Yang, Bernhard Schmid, Keping Ma, Xiaojuan Liu   +15 more
wiley   +1 more source

Plant invasion in mountain ecosystems reduces soil micro‐food web complexity at higher elevations

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Anthropogenic activities have accelerated plant invasions in mountain ecosystems, impacting the structure and functions of native plant communities. Changes in above‐ground vegetation can drive shifts in below‐ground biota, yet the effects of plant invasions on soil ...
Runjie Jiao, Yunjian Xu, Xiao Xu, Yi Wang, Jihua Wu, Xiaoli Cheng, Rongzhen Liu, Bo Li, Yupeng Geng   +8 more
wiley   +1 more source