Results 41 to 50 of about 55,024 (177)

A link between increased temperature and avian body condition in a logged tropical forest

open access: yesConservation 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

基于ARMA模型的GIS局部放电发展趋势预测

open access: yesGaoya dianqi, 2020
气体绝缘组合电器(gas insulated switchgear,GIS)设备局部放电存在安全隐患,不容忽视。文中采用特高频法研究GIS中典型局部放电过程,建立局部放电缺陷模型,进行大量试验获得数据。提取数据得到局部放电特征量,并采用局部放电特征谱图研究局部放电的特征。对特征量进行筛选、分类,选取不同类型特征量代入自回归移动平均模型中对GIS局部放电发展趋势的预测情况进行分析研究。结果表明:①对于局部放电线性参量,ARMA预测模型可以对其发展趋势进行准确预测,整体预测误差值均在10%以下 ...
何金   +7 more
doaj  

China’s Stock Return Rate Prediction Based on MCMC Method [PDF]

open access: yes, 2016
近年来,股票慢慢成为金融市场中主要的理财工具,对股票市场收益率的良好把握有助于人们优化手中的资产配置,因此如何正确预测股票市场的收益率渐渐成为了经济金融研究中的热点问题.为此,一些学者开始试图应用先前的理论将股票收益率与其他变量相联系,通过统计学方法并建立数学模型来寻找股票收益率与其他变量的数量关系,尝试得到股票市场收益率的预测.
刘若佳
core  

Assessing the integration of social marketing principles in ivory demand management interventions in China and Southeast Asia

open access: yesConservation Biology, EarlyView.
Abstract Consumer demand for ivory perpetuates the unsustainable and illegal killing of African elephants and other wildlife species. Interventions that aim to change consumer behavior are increasingly recognized as a crucial element of demand management. However, poor design and implementation have limited their effectiveness.
Molly R. C. Brown   +2 more
wiley   +1 more source

The Research of MiRNA-Disease Correlation Prediction [PDF]

open access: yes, 2016
MiRNA是一类重要的非编码RNA,它在许多的生命活动中扮演着非常重要的角色。经研究证实,miRNA与disease的产生有着密切的联系。本文主要基于生物异构网络和机器学习的方法对miRNA-disease关系进行分析与预测。主要包括以下几个方面的内容: (1)本文详细介绍了当前已提出的miRNA-disease关联预测的主要方法,并且对比了不同方法之间的差异,为生物信息研究人员后续对miRNA-disease关联分析和预测的研究提供参考。现已提出的miRNA-disease关联分析和预测方法 ...
李金金
core  

Informing spatial conservation prioritization with species’ traits

open access: yesConservation 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

Study on Procurement Optimization for Third-party Reverse Logistics Service Providers of Electronic Products ——Based on Company X [PDF]

open access: yes, 2016
在现代社会,随着科技不断发展,电子产品越来越普及。面对着越来越大的回收压力和售后维修需求,电子产品制造商开始将逆向物流环节外包,这样既可以保持自己的核心竞争力,也能充分发挥各方优势。这就催生了电子产品第三方逆向物流服务行业,他们专门为电子产品品牌商提供逆向物流服务,包括产品的运输、拆卸、检测、维修、报废等服务。这些企业往往经营管理水平较低,而逆向物流存在着极大的不确定性,再加上电子产品本身的一些特点,如产品周期性、种类多等也加剧了这种不确定性,这给企业的管理带来不小挑战 ...
曾倩岚
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

基于大气环境质量及气象参数的绝缘子积污预测研究现状

open access: yesGaoya dianqi, 2017
及时全面掌握电网积污水平是预防电网污闪事故的基础,通过绝缘子积污预测获取污秽水平是适应电网智能化的发展方向,但目前绝缘子积污预测的理论基础不够完善,预测准确性欠缺。文中以上述问题为出发点,对绝缘子积污的外部影响因素进行了分析,对基于大气环境成分、基于气象参数预测绝缘子积污的方法及其准确度、适用性进行了总结。结果表明,大气环境成分、气象参数对绝缘子积污有显著影响;目前基于大气环境成分的绝缘子积污预测尚无法实现饱和污秽度的预测,基于气象参数的绝缘子积污预测尚不能满足工程要求;综合大气环境成分 ...
李特   +5 more
doaj  

行人轨迹预测方法综述

open access: yes智能科学与技术学报, 2021
随着深度学习技术的突破和大型数据集的提出,行人轨迹预测的准确度已经成为人工智能领域的研究热点之一。主要对行人轨迹预测的技术分类和研究现状进行详细的综述。根据模型建模方式的不同,将现有方法分为基于浅层学习的轨迹预测方法和基于深度学习的轨迹预测方法,分析了每类方法中具有代表性的算法的效果及优缺点,归纳了当前主流的轨迹预测公开数据集,并在数据集中对比了主流轨迹预测方法的性能,最后对轨迹预测技术面临的挑战与发展趋势进行了展望。
李琳辉, 周彬, 任威威, 连静
doaj  

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