论西部地区的生态重建

我国西部地区生态问题突出地表现为水土流失、荒漠化、草地退化和土壤盐渍化 ,这些问题与人口、贫困一起构成了 PPE循环。基于此 ,西部地区生态重建是一个系统工程 ,要把握好土地利用结构、环境人口容量、科技创新、城镇体系建设及生态重建效果评估等几个问题     

FDI对大连经济技术开发区产业结构的影响

针对经济全球化、贸易投资自由化深入发展背景下外商直接投资在国民经济中地位日益提高、作用不断增强的现状,就FDI对大连经济技术开发区产业结构的影响进行调研分析。介绍大连经济技术开发区利用FDI的概况,分析其产业结构的现状及存在的问题,并对FDI对其产业结构的影响进行调研分析,提出利用FDI优化其产业结构的若干对策。     

Nonparametric covariate adjustment for receiver operating characteristic curves

The accuracy of a diagnostic test is typically characterized using the receiver operating characteristic (ROC) curve. Summarizing indexes such as the area under the ROC curve (AUC) are used to compare different tests as well as to measure the difference between two populations. Often additional information is available on some of the covariates which are known to influence the accuracy of such measures. The authors propose nonparametric methods for covariate adjustment of the AUC. Models with normal errors and possibly non‐normal errors are discussed and analyzed separately. Nonparametric regression is used for estimating mean and variance functions in both scenarios. In the model that relaxes the assumption of normality, the authors propose a covariate‐adjusted Mann–Whitney estimator for AUC estimation which effectively uses available data to construct working samples at any covariate value of interest and is computationally efficient for implementation. This provides a generalization of the Mann–Whitney approach for comparing two populations by taking covariate effects into account. The authors derive asymptotic properties for the AUC estimators in both settings, including asymptotic normality, optimal strong uniform convergence rates and mean squared error (MSE) consistency. The MSE of the AUC estimators was also assessed in smaller samples by simulation. Data from an agricultural study were used to illustrate the methods of analysis. The Canadian Journal of Statistics 38:27–46; 2010 © 2009 Statistical Society of Canada     

Assessing accuracy of a continuous screening test in the presence of verification bias

Summary.  In studies to assess the accuracy of a screening test, often definitive disease assessment is too invasive or expensive to be ascertained on all the study subjects. Although it may be more ethical or cost effective to ascertain the true disease status with a higher rate in study subjects where the screening test or additional information is suggestive of disease, estimates of accuracy can be biased in a study with such a design. This bias is known as verification bias. Verification bias correction methods that accommodate screening tests with binary or ordinal responses have been developed; however, no verification bias correction methods exist for tests with continuous results. We propose and compare imputation and reweighting bias-corrected estimators of true and false positive rates, receiver operating characteristic curves and area under the receiver operating characteristic curve for continuous tests. Distribution theory and simulation studies are used to compare the proposed estimators with respect to bias, relative efficiency and robustness to model misspecification. The bias correction estimators proposed are applied to data from a study of screening tests for neonatal hearing loss.     

新四军在江苏抗日根据地的反“清乡”斗争政策述论

为确保对华中占领区的统治,消灭该地区内的新四军,1941年7月至1944年底,日汪在江苏大部分地区掀起了罪恶的“清乡”活动。针对日汪掀起的“清乡”活动,活跃在江苏抗日根据地的新四军在中共中央及华中局的领导下,坚持党的一元化领导,把武装斗争、统一战线与群众动员紧密结合在一起,积极展开反“清乡”运动,最终赢得了反“清乡”斗争的胜利。     

关于科学发现机器的研究

本文阐述了科学发现的两个判据,在知识存贮有劣性原理的基础上,提出了知识存贮不完全性原理,指出存在一类逻辑上具有非放大性,但认识论上具有放大性的演绎发现机器。在休谟问题逻辑学范围内不可解原理的基础上,论证了不存在通用的归纳发现机器,但建立局部合理的、有效的、完备的归纳发现机器是可行的。最后,本文描述了科学发现机器的结构,并在文献的基础上,描述了一种同时具有发生与评价功能的归纳发现机器并论证了它的合理性。     

IF1005股指期货合约与沪深300指数的价格发现研究

股指期货对现货市场的价格形成究竟会不会产生影响,通过什么样机制产生影响,影响程度如何等问题成为其上市包括监管机构,市场人士与媒体普遍关心的问题.论文利用P-T模型分析了IF1005与沪深300股指的价格发现过程,发现了在合约生命期内,平均来看,股指期货在价格发现过程中起主导作用.但在市场处于不同走势中,期货与现货在价格发现过程中主次地位有一些差异.股市上涨过程中,期货起主导作用,股市下跌过程中,现货起主导作用.     

西部农村反贫困战略模式:"教育反贫困"

西部贫困地区是中国农村贫困地区反贫战略的重点和难点地区。深入研究西部反贫困,将进一步丰富发展经济学、区域经济学等学科,更深刻地认识反贫困的规律,从而更有效地指导反贫困的实践。西部“教育反贫困”战略模式的主要内容包括:“教育反贫困”战略的指导思想、奋斗目标、阶段、重点和难点、措施。     

凉山州北部地区尔苏藏族文化概述

凉山州北部地区的藏族自称“尔苏”。居住在甘洛越西两个县的尔苏藏族约6800人。尔苏人没有严格意义的文字,有极少量的原始宗教传人“萨巴”使用萨巴文字,是比东巴文化还要古老的图画文字。尔苏藏族喜欢狩猎。所有的尔苏藏族民居几乎都有“三锅庄”,“三锅庄”是尔苏藏人由游牧民族过度到农耕民族留下的痕迹。脚犁、背架子、倍尔和连枷是尔苏人比较独特的劳动工具,其中,脚犁是凉北地区尔苏藏人独有的构思巧妙的劳动工具。尔苏藏人服饰独特,服装色调鲜亮,刺绣水平高超,尔苏人男女都要裹头帕。尔苏人实行火葬,有专门的坟山焚烧尸体。现在尔苏人的婚姻,实行一夫一妻制。     

城中村语言景观与三峡移民身份认同调查研究——以后移民时期湖南衡阳地区三峡移民为例

前移民时期早已达成迁得进的目标,业已完成移民迁建使命。稳得住、逐步能致富正成为新时代后移民时期达成目标的关键。基于此,文章以湖南省衡阳市武广新区城中村三峡移民为研究对象,通过两个观察维度,考察了城中村语言景观,寻找语言景观的使用特点、使用规律和语码选择背后透视出来的身份认同问题。研究结果显示:城中村语言景观与三峡移民对迁入地的语码身份认同以及对迁出地的地域身份认同具有同构关系;三峡移民对迁入地及武广新区城中村的地域身份认同感处于中等稍弱层级。这表明:三峡移民的需求层次正处于由谋生型向发展型转变的关键节点。文章分析了其动因,提出了其对策。这对有效解决三峡移民需求层次转变关键节点中出现相关新问题,以及对有效解决三峡移民社区社会经济文化和谐发展问题均具有重要现实意义。