Results 81 to 90 of about 256,015 (173)
Jellyfish blooms restructure plankton dynamics and trophic linkages in coastal waters
Functional Ecology, Volume 40, Issue 5, Page 1443-1460, May 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Jellyfish blooms are increasing globally in frequency and intensity, introducing complex ecological interactions, yet the mechanisms by which they alter ecosystem structure remain poorly characterized due to a lack of sustained field observations.
Pengpeng Wang +4 more
wiley +1 more source
Gaoya dianqi, 2009 内部均压是高压硅堆研制的关键技术,而硅堆电压分布不均的现象在端部最为突出。以硅堆分布参数等效电路为基础,先采用解析方法分析硅堆内部电压分布规律和影响因素,针对硅堆端部电压分布尤其不均匀的特点,建立EMTP仿真模型,分析端部强制均压元件参数对硅堆电压分布不均匀系数的影响。提出采用非等值均压参数配置方法改善端部电压分布,并通过实验验证了这种非等值均压参数配置方法对改善高压硅堆电压分布不均匀度的效果。研究表明,这种端部均压方法能有效降低硅堆端部的分压,从而提高硅堆整体的反向耐压。
张磊 +4 more
doaj
Forecasting the Risk of Reinvasion by the Giant African Snail in Ogasawara, Japan
Biotropica, Volume 58, Issue 3, May 2026.This study used SDMs constructed in multiple regions to predict the suitable habitats of Achatina fulica on Chichijima in the Ogasawara Islands. The model constructed on another island with a wide distribution range showed the highest predictive accuracy.
Mai Matsumoto, Takeshi Osawa
wiley +1 more source
中国历史上的虎(Panthera tigris)亚种名称及分布地
野生动物学报, 2016 根据对中国200万年以来虎的分布变迁系统研究,表明中国历史上分布的虎在生态环境变迁过程中曾产生9个亚种,它们的出现与部分灭绝的亚种并不在同一时间。文中不仅对新增虎亚种进行考证,而且对大部分虎亚种的形态、栖息地、分布地区进行梳理,明确它们的古今分布状况及分布界线,还提出规范各虎亚种名称的具体建议。
文榕生 张明海
doaj
The Application of VaR Method Based on the MS-GARCH Model in Securities Asset Management Market [PDF]
, 2016 近几年来，我国券商资产管理业务取得了突飞猛进的发展，然而相应的风险管理学术研究较少。为了研究券商资管市场的风险管理VaR方法，本文选取股票型券商理财指数作为数据处理对象，假定模型的扰动项分别服从正态分布、t分布、广义误差分布、偏t分布、偏广义误差分布，采用单一状态GARCH族模型（GARCH模型、EGARCH模型、GJR-GARCH模型、APARCH模型）对数据进行建模。之后，文章在GARCH模型中引入马尔可夫状态转换过程，构建MS-GARCH模型 ...
何浩
core
Attainment Pairing Effects on Cognitive Conflict in Technology‐enhanced EFL Cooperative Tasks
International Journal of Applied Linguistics, Volume 36, Issue 2, Page 1594-1605, May 2026.ABSTRACT This study examines how attainment pairing (high‐high versus high‐low versus low‐low attainment) impacts English as a Foreign Language (EFL) learner engagement during technology‐enhanced cooperative writing tasks. Seventy‐eight Chinese university learners formed 39 dyads (13 pairs per group) via Tencent Meeting.
Ying Liu, Allen Thurston
wiley +1 more source
Dianci bileiqi, 1989 论述了应用有限元法计算MOA电位分布和一种新型简便的具有一定精度的电位分布测量方法.两种结果取得了良好的一致性.通过计算和试验研究,分析了影响MOA电位分布的各种因素,并提出了电位分布优化设计方法.
毛慧明, 周佩白, 王国红
doaj
高強度円偏光レーザーパルス照射による原子の光電子運動量分布に現れる極大のずれの分析 [PDF]
, 2017 高強度円偏光レーザーパルスを原子に照射することで引き起こされるトンネルイオン化に起因する光電子運動量分布ついての理論的研究を行った。時間依存シュレーディンガー方程式の直接数値解法によって高精度かつ高効率で光電子運動量分布を求める計算コードを開発した。半サイクルおよび1サイクルの超短パルス照射について、光電子運動量分布の数値計算結果と漸近展開に基づく解析理論である断熱理論による結果を比較した。そして、２つの結果が、特に長波長において、定量的に良く一致することを確認し、断熱理論の妥当性を示した。さらに ...
Masataka Omi, 大海 真貴
core +2 more sources
Review of Policy Research, Volume 43, Issue 3, May 2026.ABSTRACT Using data from a long‐term survey of senior civil servants (1970–2021), this study investigates the declining share of jurists in federal ministerial departments in Germany. The mechanisms driving this trend and its subsequent effects are discussed from an organizational perspective, highlighting the influence of environmental pressure and ...
Marian Döhler
wiley +1 more source