Results 31 to 40 of about 622,343 (193)
四川大学学报. 自然科学版, 1999 近年来，人们对于过渡核的形状相变问题十分关注，文［１］利用系统比较每一同位素核链的实验壳能随中子数的变化来研究形状相变，确定了一些核的相变点．我们通过直接计算原子核的势能曲线随中子数的变化来分析这一问题，直观清楚地得到相变点．对于原子核形状的讨论，在...
张静, 廖继志
doaj
Habitat and spatial trends of U.K. wintering waterbird populations over 50 years
Conservation Biology, EarlyView.Abstract The United Kingdom is an important wintering ground for millions of waterbirds. Most U.K. wintering waterbird populations increased between 1970 and the mid‐1990s, but declined thereafter. We examined U.K. population indices in 46 wintering waterbird species in two 25‐year periods, 1970–1994 and 1995–2019, to identify which waterbird groups ...
Blaise Martay +8 more
wiley +1 more source
Effects of restoration practices on biodiversity in temperate and boreal forests
Conservation Biology, EarlyView.Abstract Several restoration practices are used to mitigate and compensate for the negative effects of large‐scale forestry on biodiversity in temperate and boreal forests. A comprehensive synthesis of the benefits of these practices across taxa is missing. We conducted a systematic review and meta‐analysis on this topic.
Malin Tälle +2 more
wiley +1 more source
Gaoya dianqi, 2023 在中国大容量的电力传输中，大多数采用三相五柱变压器，由于三相五柱变压器中零序磁路的存在导致直流入侵后磁路会发生严重饱和。为深入研究三相五柱变压器直流偏磁问题，搭建磁场有限元仿真模型，并配合变压器YNyn0联结的外电路方程进行耦合，通过在原边侧中性点输入不同大小的直流电流，首次模拟直流偏磁对三相五柱变压器负载下的影响。文中通过计算变压器原、副边电流和励磁电流波形与空载直流偏磁进行对比，并重点分析尖顶波处的变压器磁场分布，发现直流入侵对负载下副边绕组电流影响较小，原边电流随着直流电流增大发生一定程度的畸变 ...
郭苏鑫, 王泽忠, 梁书原
doaj
Psychometric framework for coexistence with large carnivores
Conservation Biology, EarlyView.Abstract Human–carnivore coexistence is essential for biodiversity conservation, yet measuring the attitudes and behaviors that support it remains methodologically challenging. We developed psychometric scales to assess willingness to coexist with carnivores and the underlying beliefs of this coexistence through an iterative expert elicitation process ...
Benjamin Ghasemi +14 more
wiley +1 more source
Modeling seed germination data to meet biodiversity conservation needs in the Mediterranean
Conservation Biology, EarlyView.Workflow to assess the availability and quality of germination data and assign species' thermal risk in the Mediterranean. (a) Assessment of data availability, including the phylogenetic distribution of the number of records (i.e. available germination data); (b) data quality assessment; and (c) assignment of climate risk categories for species that ...
Diana María Cruz‐Tejada +2 more
wiley +1 more source
Conservation Biology, EarlyView.Abstract Reversing ongoing biodiversity loss requires effectively managing anthropogenic threats. Although conservation actions can mitigate these threats, prioritizing and targeting such actions remain challenging because species respond differently depending on the nature of the threats and their biological traits.
Camila Guerrero‐Pineda +3 more
wiley +1 more source
, 2009 本发明涉及相变材料的制备方法，具体的说是一种具有较高相变潜热，并且在固体和液体状态下均具有很高导热系数的复合相变材料的制备方法。按如下步骤制备：1)制备金属纳米线；2)将金属纳米线分散到有机溶剂中； 3)将有机相变材料与上述混合物混合；4)加热条件下超声波分散混合物并除去有机溶剂。通过这种方法制得的相变材料，工艺简单，成本低，在保持较高的相变潜热的同时，大大提高了有机相变材料的导热系数，从而有效地改善了有机相变材料的性能，大幅度地拓展了它的应用范围 ...
孙立贤, 赵军宁, 徐 芬, 曾巨澜
core
Conservation Biology, EarlyView.Abstract Modeling species distributions in dynamic pelagic environments remains challenging, particularly for wide‐ranging and highly mobile species when there is limited guidance on model performance. This limitation constrains the effective use of species distribution models (SDMs) in marine conservation, where robust and transferable predictions are
E. Pasanisi +32 more
wiley +1 more source
基于小波变换的2013年芦山MS7.0地震前姑咱台钻孔应变异常时频分析
Dizhen xuebao, 2019 2013年4月20日芦山MS7.0地震前，四川省姑咱台四分量YRY-4型钻孔应变仪记录到显著的高频应变畸变信号。为了避免该畸变信号的高频部分在时频演化过程中发生频率混叠现象，同时便于讨论同一研究频段内震前更早记录到的弱应变异常时段与显著应变异常时段的相关性，本文对2012年1月1日至2013年4月20日期间姑咱台的钻孔应变数据进行了时频分析，并使用时域分段的小波变换方法，在局部时频谱中提取了应变异常，分析了各应变异常的频率相关性。结果表明，研究频段内存在两个峰值频率 ...
Weichen Zhang +4 more
doaj +1 more source