Results 21 to 30 of about 3,086 (113)
Mapping legal authority for terrestrial conservation corridors along streams
Conservation Biology, Volume 34, Issue 4, Page 943-955, August 2020., 2020 Abstract Wildlife corridors aim to promote species’ persistence by connecting habitat patches across fragmented landscapes. Their implementation is limited by patterns of land ownership and complicated by differences in the jurisdictional and regulatory authorities under which lands are managed.
Amanda T. Stahl +2 more
wiley +1 more source
Using metapopulation theory for practical conservation of mangrove endemic birds
Conservation Biology, Volume 34, Issue 1, Page 266-275, February 2020., 2020 Abstract As a landscape becomes increasingly fragmented through habitat loss, the individual patches become smaller and more isolated and thus less likely to sustain a local population. Metapopulation theory is appropriate for analyzing fragmented landscapes because it combines empirical landscape features with species‐specific information to produce ...
Ryan Huang, Stuart L. Pimm, Chandra Giri
wiley +1 more source
基于浮地系统接地特征识别算法的直流漏电流传感保护模块性能参数测试
Dianci bileiqi, 2023 为了测试浮地系统的直流漏电流传感保护模块性能参数，判断直流漏电流传感保护模块是否存在异常，为此提出基于浮地系统接地特征识别算法的直流漏电流传感保护模块性能参数测试方法。建立基于长短期记忆网络模型，根据浮地系统接地特征辨识方法，识别接地信息中异常特征，然后由基于动作特性检测的直流漏电流传感保护模块性能参数测试装置，检测漏电流，采集电路里剩余动作电流信息，把电流信号变换为能够被ARM处理器接受的电压信号，实施采样后进行CPU运算。实验结果表示：所提方法对浮地系统接地信息异常特征的识别精度与识别效率显著 ...
张东晖 +4 more
doaj
无联接变压器型智能软开关装置的故障特性及对应策略 [PDF]
全球能源互联网, 2018 以10 kV消弧线圈接地方式下的配电网接入无联接变压器的智能软开关（soft normally open point，SNOP）为背景，通过电路分析和序分量分解的方式，建立了交流故障时正负零序分量下的数学模型，分析了无变压器情况下，故障侧零序电压引发直流电压波动和非故障侧交流电压波动的内在机理，并以配电网较为关注的单相接地故障为例，详细定量地推导了直流电压和交流电压的波动公式。基于理论分析，提出了零序控制策略和模块化多电平换流器（modular multilevel converter，MMC ...
许烽 +6 more
doaj +1 more source
智能科学与技术学报, 2022 我国现阶段仍以小规模农业为主，如何在小农、小地块的农业生产经营方式下发展适宜的智慧农业颇具挑战。基于此，提出一种结合联邦学习与区块链技术的分布式农业人工智能框架，使得在数据不共享的情况下，能达到训练模型的目的，并可建立参与方的激励机制。该框架有助于充分利用农业多源异构数据，减少对用户数据量的要求，发展因地制宜的决策模型，促进小规模农业的产销衔接。
康孟珍 +7 more
doaj +1 more source
Conservation Biology, Volume 33, Issue 3, Page 685-696, June 2019., 2019 Abstract Assessing causes of population decline is critically important to management of threatened species. Stochastic patch occupancy models (SPOMs) are popular tools for examining spatial and temporal dynamics of populations when presence–absence data in multiple habitat patches are available. We developed a Bayesian Markov chain method that extends
Nicolas Alcala +5 more
wiley +1 more source
Dianci bileiqi, 2020 输电线路杆塔接地网在外延、垂直接地等措施受限时常采用辅助降阻材料降阻,实际接地工程采用接地模块时缺少统一规范性指导,在应用时存在一些盲目施工、降阻效率低等问题。采用CDEGS软件针对新型辅助降阻材料——柔性石墨复合接地模块的接地特性进行仿真计算研究,针对"一"字型、方框型以及方框射线型接地网采用柔性石墨复合接地模块时的降阻效率进行计算,分析模块敷设位置、敷设密度、敷设方式、接地网面积等因素对接地特性的影响规律,针对实际输电线路采用柔性石墨复合接地模块降阻给出相应施工建议。
胡元潮 +5 more
doaj
Dianci bileiqi, 2022 导电混凝土在电力系统接地中具有较好的应用前景，雷电流冲击下的热特性分布对导电混凝土接地模块的设计及应用具有重要影响。基于热电耦合原理分析了雷电流冲击下导电混凝土模块的热量产生过程，研究了导电混凝土模块内部的热量传导规律，利用多物理场耦合分析软件建立了导电混凝土雷电冲击模型，对雷电流冲击下导电混凝土模块的热分布特性进行了仿真分析，并与普通土壤和普通混凝土模块进行了对比分析。仿真结果表明导电混凝土在受到雷电流冲击时，其内部的温度更低、温度梯度更小，具有较好的热学性能，较适宜用于电力系统的接地中。
程宏波 +5 more
doaj
Integrative Conservation, Volume 4, Issue 3, Page 287-301, September 2025.Qilianshan National Park covers approximately 40% of core snow leopard habitat patches and 50% of movement corridors between patches. Including more of these important areas within the park boundaries should be considered, as the Qilianshan National Park sits at a pivotal juncture between critical snow leopard habitat in China and Mongolia, and may ...
Aliana Norris +6 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 2, Page 226-234, February 2025.ABSTRACT Objectives Ultrasound is the first‐line imaging modality of the pelvis in the pediatric and adolescent gynecology (PAG) population. Ultrasound findings in pre‐ and postpubertal PAG patients differ from those in adults. Diagnostic models for adnexal pathology have not been validated in this cohort.
N. Cooper +15 more
wiley +1 more source