Results 21 to 30 of about 37,682 (204)

Study on Dependence between China Mainland’s and the Main International Stock Markets Based on Different Perspectives [PDF]

open access: yes, 2016
随着经济全球化的不断推进,国际资本市场逐渐呈现一体化趋势。作为反映国民经济的“晴雨表”和资本市场的重要组成部分,各国股票市场间存在怎样的关系呢?股市间的相依性结构对投资者合理制定投资组合策略以及监管当局有效防范国内外股市风险,维护市场稳定,推进股市健康发展具有重要的启示意义。中国已经成为全球第二大经济体,大陆股票市场也在近十年迅速发展。研究中国大陆股票市场与世界股票市场间的相依性结构具有重要的现实意义。 股市间的相依性历来是人们关心的重点,学者们对其进行了大量的研究。阅读已有相关文献 ...
崔振
core  

Comprehensive framework for assessing and optimizing existing research networks

open access: yesConservation Biology, EarlyView.
Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East   +2 more
wiley   +1 more source

A Study on the Transmitting Mechanism of Financial Risks between Chinese A-share Market and Other Major Asian Stock Markets [PDF]

open access: yes, 2016
随着经济全球化和亚洲一体化进程的深入,中国与亚洲各个国家和地区的合作取得重大突破,中国在亚洲金融市场的话语权不断提高,承担的责任也越来越大,面临来自亚洲的系统性风险越来越不容忽视。深入研究中国A股与亚洲其他主要股市金融风险的传导机制,对中国的经济发展与金融安全以及跨境资产配置都具有非常重要的理论与现实意义。 为了揭示中国A股与亚洲其他主要股市的风险传导机制,本文从风险传导的“外在”和“内在”两个视角进行研究。在“风险传导的外在表现”方面,本文从整体和局部两个层面进行分析。整体层面上 ...
林琛
core  

Representation of obligate groundwater‐dwelling copepod diversity in European protected areas

open access: yesConservation Biology, EarlyView.
Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli   +7 more
wiley   +1 more source

An experimental approach to assess the combined effects of multiple stressors on a large vertebrate species

open access: yesConservation Biology, EarlyView.
Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta   +24 more
wiley   +1 more source

近视眼患者角膜屈光力与角膜表面对称性的相关性分析

open access: yesZhongguo shiyan zhenduanxue, 2005
目的探讨近视患者角膜屈光力与角膜表面对称性的相关关系。方法对近视患者眼1472只(其中男性眼715只,女性眼757只)、行PRK手术后1年的患者眼161只和行LASIK手术后1年的患者眼158只进行统计学分析,研究角膜平均屈光力(ACP)与角膜表面非对称指数(SAI)的相关关系。结果ACP与SAI在男性和女性中均存在明显的正相关关系(Pearson相关系数为分别为0·120、0·108 ...
吴荒, 周跃理, 岳志强, 宋跃
doaj  

The Research of Global Stock Markets’ Complex Networks in the Time Slot Chosen by the PCA Method [PDF]

open access: yes, 2016
全球股票市场组成了一个关系交错的复杂网络系统,在全球一体化的经济背景下,网络的内部结构关系越来越紧密。如今,发达国家的经济增长乏力,新兴国家增速放缓,经济硬着陆的风险仍在,整体经济形势不容乐观,危机的脚步似乎越来越近。在这样的背景之下,通过对股票市场网络结构的研究,发现网络中的关键市场和关键联系,监管者便可以通过对这些关键结构实施重点的风险监控,投资者也可以关注这些关键结构的变化做出投资决策。 复杂网络作为一种对股票市场结构研究的方法,在其运用中,时间区间的不同将使网络呈现出不同的结构形态 ...
刘婷
core  

Effects of landscape context on avian specialist response to increased surface temperature in protected areas

open access: yesConservation Biology, EarlyView.
Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge   +2 more
wiley   +1 more source

光接入网链路状态信号相关性判据方法

open access: yesGuangtongxin yanjiu, 2019
针对二维光编解码接入网链路监测系统中多路距离相近用户信号叠加难以设置阈值的问题,提出了一种基于信号相关性的链路状态识别算法。该算法以正常信号为基准,对实时检测的信号进行信号相关性分析,根据带补偿自定义相关系数及系统的编码规则判断具体分支链路状态。搭建了32用户、3路等距实验系统,等距离链路断路个数为1时,相关系数为0.626 1;断路个数为2时,相关系数分别为0.342 1、0.386 5,均在阈值区间内。仿真结果表明 ...
郭浩   +8 more
doaj  

Correlation between structural parameters of Lindera Aggregata 's chemical compositions and the retention time of chromatogram(乌药化学成分结构参数与色谱保留时间的关系)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2018
乌药含有呋喃倍半萜、黄酮、生物碱、挥发油等多种化学成分,具有抗氧化、抗肿瘤及抑菌等活性.为研究乌药化学成分的性质,计算了乌药化学成分的分子连接性指数和电性拓扑状态指数,并筛选分子连接性指数中的0X,5X和5Xc,以及电性拓扑状态指数中的E1,E2和E3,将这6种结构指数作为神经网络的输入层变量,色谱保留时间作为输出层变量,做回归分析,采用6:5:1的神经网络结构,构建了预测能力较强的预测模型.该模型总相关系数rt为0.994 0,训练集相关系数为0.992 9,测试集相关系数为0.997 0 ...
DUXihua(堵锡华), WANGChao(王超)
doaj   +1 more source

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