搜索结果: 16-30 共查到“知识库 环境统计学”相关记录42条 . 查询时间(4.406 秒)
Discussion of: A statistical analysis of multiple temperature proxies: Are reconstructions of surface temperatures over the last 1000 years reliable?
reconstructions of surface temperatures statistical analysis
2011/6/17
McShane andWyner (2011) (henceforthMW) analyze a dataset of “proxy”
climate records previously used by Mann et al. (2008) (henceforth M08) to
attempt to assess their utility in reconstructing past t...
We show how to control the generalization error of time series models wherein past values of the outcome are used to predict future values.
Reduced long-range dependence combining Poisson bursts with on--off sources
Teletraffic fractional Brownian motion on–off process
2011/7/5
A workload model using the infinite source Poisson model for bursts is combined with the on--off model for within burst activity. Burst durations and on--off durations are assumed to have heavy-tailed...
Adaptation to anisotropy and inhomogeneity via dyadic piecewise polynomial selection
anisotropy inhomogeneity piecewise polynomial
2011/3/22
This article is devoted to nonlinear approximation and estimation via piecewise polynomials built on partitions into dyadic rectangles. The approximation rate is studied over possibly inhomogeneous an...
Integral representations and properties of operator fractional Brownian motions
dichotomy principle integral representations long-range dependence multivariate Brownian motion operator fractional Brownian motion operator self-similarity
2011/3/18
Operator fractional Brownian motions (OFBMs) are (i) Gaussian, (ii) operator self-similar and (iii) stationary increment processes. They are the natural multivariate generalizations of the well-studie...
Predictors of short-term decay of cell phone contacts in a large scale communication network
edge persistence edge decay link prediction dynamic networks embeddedness tie strength weighted networks
2011/3/25
Under what conditions is an edge present in a social network at time t likely to decay or persist by some future time t + Delta(t)? Previous research addressing this issue suggests that the network ra...
防治并举构筑城市生态环境保护新防线
城市生态环境保护 新防线
2009/6/29
近年来，本市政府高度关注涉及民生发展的环境保护问题，采取各种措施改善人居环境。在三轮环保三年行动计划的有力推动下，本市环境质量持续得到改善，市民共享环境保护的成果。为客观反映市民对近年来本市环境变化的评价，国家统计局上海调查总队近期对本市1200户居民家庭开展了一次专项调查。调查内容涉及市民对本市大气环境治理、河道黑臭治理、噪声环境治理、城市卫生、城市绿化、自来水水质、白色污染和食品安全等八个方面...
结合我国当前处于由目标总量控制向容量总量控制过渡时期的特点, 以公平与效率为配置原则, 构建了由法定削减与公平削减
组成的两步削减模型。通过模糊聚类分析和层次分析法的联合应用, 建立了模型的求解方法。
Random walk in deterministically changing environment
Random Walk Random environment Dynamical Systems CLT Transfer operator
2009/6/12
We consider a random walk with transition probabilities weakly dependent on an environment with a deterministic,but strongly chaotic,evolution.We prove that for almost all initial conditions of the en...
Shape and local growth for multidimensional branching random walks in random environment
Shape theorem subadditive ergodic theorem transience growth ex-ponent population size
2009/6/12
We study branching random walks in random environment on the d-dimensional square lattice, d 1. In this model, the environment has nite range dependence, and the population size cannot decrease. We pr...
Strong disorder implies strong localization for directed polymers in a random environment
Directed polymers Random environment strong disorder localization parabolic Anderson
2009/6/12
In this note we show that in any dimension d, the strong disorder property implies the strong localization property. This is established for a continuous time model of directed polymersin arandom envi...
On an extension of jump-type symmetric Dirichlet forms
jump-type symmetric Dirichlet forms element
2009/3/23
We show that any element from the (L2-)maximal domain of a jump-type symmetric Dirichlet form can be approximated by test functions under some conditions. This gives us a direct proof of the fact that...
多层单元式住宅的公共空间与环境设计探讨
多层单元式住宅 人居环境 公共空间
2009/3/23
多层单元式住宅是我国城镇住宅的主要类型,人们对居住环境的关注已从过去的室内环境逐步转移为室外公共空间与环境,本文结合我国传统的住宅文化和符合现代精神的设计理念,探讨多层单元式住宅的公共空间与环境营造,以创造一个自然、亲和、安全、健康的居住环境,提高城镇居民的生活质量。
环境资源估价方法述评
环境价值 绿色GDP 环境估价
2008/8/13
环境资源估价是计算绿色GDP，进行绿色国民经济核算的关键。本文在探讨环境价值构成的基础上，对剂量―反应法、生产率变动法、防护费用估价法、影子工程估价法、产品替代估价法、旅行成本估价法、享乐成本估价法、意愿估价法和环境资源的费用效益分析等环境估价方法进行评述，并针对现有估价方法的缺陷指出当前环境估价存在的问题以及其进一步研究的方向。
关于搞好第一次全国污染源普查的思考
污染源 普查
2008/8/7
党的第十七次全国代表大会首次将“生态文明”概念写入党的政治报告。污染源普查作为一项重大的国情调查，对发展生态文明，促进节能减排具有重大的历史意义。为此，笔者根据多年基层污染源调查、环境统计、排污申报工作的体会，对如何提高污染源普查质量作些探讨，以供商榷。
一、审慎思考，掌握内涵，提高普查的准确性
“准确”是污染源普查的...