Results 61 to 70 of about 253,021 (198)
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
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Wildlife Letters, EarlyView.In the winter of 2021/2022, a winter track survey revealed 43–46 tigers (without cubs) in 5.4 thousand km2 of suitable habitats in the Southwest Primorsky Province of Russia. In the same period, a network of camera traps registered 54 adult/subadult tigers here.
Yury Darman, Dina Matiukhina
wiley +1 more source
Shuitu Baochi Xuebao, 1995 对中国降雨侵蚀力Ｒ值的计算与分布进行了系统研究。主要内容包括Ｒ指标的确定；次降雨Ｒ失真、Ｒ值以及多年平均Ｒ值的简易计算方法；我国不同地区年Ｒ值的月分布、次分布、频率分布和年际变化特征，以及Ｒ值的雨量、雨强分布特征；对我国１４０多个重点站的Ｒ值进行了计算；在分析我国降雨侵蚀力Ｒ值区域分布特征的基础上，编制了中国降雨侵蚀力等值线图，进行了降雨侵蚀力分区。
王万中 张宪奎
doaj
On the Calculation of the Starting Torque of the Shaded-Pole Motor [PDF]
, 1955 Setting several assumptions, I have got formulas of the air gap flux, and the rotor-bar current distribution of the shaded-pole motor. And from them, I have derived a formula of the starting torque, Which shows the average value about the time and the ...
齊藤 仁代
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Wildlife Letters, EarlyView.Asiatic black bears in Russia face conservation threats such as habitat destruction and fragmentation, which exacerbate food shortages caused by crop failures. This study explores an innovative approach to rehabilitating bears that abandon hibernation in mid‐winter due to extreme exhaustion by providing supplemental food near their den sites.
Sergey A. Kolchin +2 more
wiley +1 more source
自己相似分布上のレート歪関数とシャノン下界の漸近的最適性 [PDF]
, 2019 有歪情報源符号化では情報源アルファベットと再生アルファベット間に定義された歪尺度に基づいて，平均歪に対する達成可能な情報レートの最小値をレート歪関数として表現することを目指す．まず基本的仮定として情報源は定常無記憶であるする．情報源アルファベットと再生アルファベットをいずれもユークリッド空間にとり，歪尺度を情報源記号と再生記号の差にのみ依存する差歪尺度の加法により定義されるものとする．このときレート歪関数には、シャノン下界式が知られている ...
田口 慎吾
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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 +5 more
wiley +1 more source
Gaoya dianqi, 2006 建立数学模型计算了复合绝缘子的沿面电场分布,利用有限元法计算了220kV线路复合绝缘子不安装均压环及安装不同形状尺寸均压环时沿面场强分布和电位分布。分析了均压环各因素变化对电场分布改善效果的影响,指出环径和罩深对端部电压分布改善效果明显,管径对电场分布改善效果好,根据各因素的综合影响,推荐了220kV复合绝缘子均压环的结构参数。
卫李静 +5 more
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有机磷酸酯在环境/ 生物相中的分布、分析方法及毒理效应 [PDF]
, 2016 有机磷酸酯(organophosphate esters, OPEs)主要作为阻燃剂及增塑剂等而被广泛使用,且极易释放于环境。近年来,由于溴系阻燃剂的禁用,有机磷酸酯类阻燃剂的产量及消费量大幅增加,OPEs 已经成为一种新兴污染物并受到广泛关注,多篇文献报道了其在环境及生物相中的分布和毒理效应。本文主要对OPEs 在地表水、沉积物、大气及生物相中的分布、分析方法及毒理效应进行综述,并对未来OPEs 分布及毒理学研究进行展望 ...
李斐 +1 more
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Wildlife Letters, EarlyView.This review summarizes the status of musk deer in China, highlighting severe population declines due to illegal hunting and habitat loss, and proposes integrated conservation strategies including habitat protection, captive breeding, and law enforcement to support the recovery and sustainable management of this ecologically and economically important ...
Feng Jiang +8 more
wiley +1 more source