Results 11 to 20 of about 13,597 (161)
Justice in coexistence: Pastoralism and large carnivores on the Qinghai‐Tibet Plateau
People and Nature, EarlyView.Abstract The conflict between livestock husbandry and large carnivore conservation presents significant challenges in grassland ecosystems worldwide. Achieving sustainable coexistence among herders, livestock and large carnivores requires reconciling diverse perspectives and interests through equitable, inclusive and fair processes that address both ...
Yufang Gao, Yue Yu
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Ni3S2 has emerged as a promising catalyst for the electrochemical oxidation of biomass‐derived 5‐hydroxymethylfurfural (HMF) to 2,5‐furandicarboxylic acid (FDCA), driven by its distinctive physicochemical properties. However, its practical catalytic efficiency is severely hindered by abundant electrochemically inactive surface sites and poor ...
Cheng‐Feng Yi +5 more
wiley +1 more source
A link between increased temperature and avian body condition in a logged tropical forest
Conservation Biology, EarlyView.Abstract The combined effects of anthropogenic disturbances, such as logging and climate change, remain poorly understood; yet, they are the main threats to tropical biodiversity. Most tropical African countries lack long‐term climate data, so climate impacts on biodiversity cannot be assessed.
Moreen Uwimbabazi +7 more
wiley +1 more source
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
Pareto Fronts of Mixed Coal Quality and Cost in Power Plant Based on Chance Constraints [PDF]
, 2022 Coal blending models usually take the composition or properties of coal as constraints to optimize the cost of mixed coal for the blending scheme in power plant. Properties of coal are essentially not optimized with this kind of blending model. Therefore,
LIU Fuguo, LIU Ke, WANG Shouen
core +1 more source
Distribution, scale, and drivers of mass mortality events in Europe's freshwater bivalves
Conservation Biology, EarlyView.Abstract Mass mortality events (MMEs) are decimating populations and compromising key ecosystem functions around the globe. One taxon particularly vulnerable to MMEs is freshwater bivalve mollusks. This group has important ecosystem engineering capacities and includes highly threatened and highly invasive taxa.
Daniel A. Cossey +39 more
wiley +1 more source
Skewness Forecasting and Skewness Risk Premium [PDF]
, 2016 目前大部分关于股票市场预测的现有文献主要是围绕收益率与波动率展开的，然而，大量实证表明，资产价格真实分布并不是传统框架下的正态分布，而呈现出非对称的特点，资产价格的偏度特征同样影响着投资者的行为，所以偏度预测对于投资者的风险管理、投资组合管理等等都有重大意义。在偏度互换尚未推出时，预测偏度可以帮助人们利用期权对冲更好的规避风险，降低对冲成本。本文借鉴Neuberger（2012），借助S&P500期权数据构造具有无偏性以及加和性的已实现偏度，采用一系列的经济变量、股票市场变量 ...
贺晨
core
Informing spatial conservation prioritization with species’ traits
Conservation Biology, EarlyView.Abstract New Guinea, the most botanically diverse island on the planet, is the location for one of the boldest conservation initiatives. The Manokwari Declaration aims to achieve 70% conservation designation for the Bird's Head Peninsula. This is 40% higher than the 2022 Global Biodiversity Framework target.
Liam A. Trethowan +27 more
wiley +1 more source
Dianci bileiqi, 1982 六、二维正态分布试验数据表明,在一定条件下,可以接受避雷器的放电电压u及预放电时间t服从二维正态分布的假设,则在确定了有关的分布参数后,就不难决定一定置信概率条件下,u、t的置信范围。由此即可使避雷器的所谓“最大”、“最小”放电电压,伏秒特性的上下包线等等有了确切的含义。
王秉钧
doaj
Effects of Recombinant Human Endostatin and Docetaxel on MMP and its Following Anti-neoplastic Effect under Different Administration Sequences [PDF]
, 2010 Background and objective The aim of this study is to observe the changes of MMP-2 and its regulators, and to investigate the mechanism of the two administration sequences of recombinant human endostatin (rh-endostatin) and docetaxel.
Jing YUAN, Kai LI
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