“国六条”政策背景下的客户置业市场调查报告

根据2006年国务院颁布的关于宏观调控房地产市场的六条规定和八项措施,通过对北京、上海、广州和深圳四个城市的置业群体、置业对象、置业目的、置业条件等因素进行调查,分析客户对90m~2套型的接受程度和市场期望,为开发商解决项目定位问题提供较详实的市场资料,对解决90m~2小套型住宅如何设计才能更好地满足中低收入阶层的居住需求问题,有较强的现实意义和社会意义!     

历史上的连续性思想和离散性思想

本文从连续性和离散性这两个概念出发,对物理学史做了一个简单地梳理。连续性和离散性是物理学史上两个非常重要的概念,它们在不同的历史阶段有着各自的理论形态。研究这两种不同的思想传统为进一步理解20世纪的量子力学争论有所帮助。     

基于P2P平台的流媒体服务设计和实现

在分析和比较目前典型P2P流媒体系统之后,提出一种基于自治域的P2PStreaming系统.该系统考虑了网络的松散性,将网络根据对等结点的地理位置来划分成不同的自治域系统,在自治域系统内推选出一些能力比较强的结点称为强结点,由强结点构成系统的中继层,降低自治域内的通讯开销.并在网络拓扑构建过程中借鉴了非结构化P2P的Gnutella组网策略并对其进行改进设计,同时系统设计使用了合理的数据分派算法来提高系统性能.     

强N_2-局部连通无爪图的Hamilton性

运用反证法的证明技巧,对任一无爪图G及其圈C,证明了只要C上有一个接触点是强N_2-局部连通的,则C一定不是最长圈.即证明了强N_2-局部连通无爪图是Hamilton图.     

多巴胺对SH-SY5Y神经元的细胞毒性及相关神经保护研究

帕金森病是一种普遍的神经退行性疾病,其病理特征是人脑黑质区多巴胺(DA)能神经元的进行性变性、死亡。帕金森病的病因和发病机制虽然至今未明,但氧化应激是主要因素。DA作为脑内主要神经递质,也是一种神经毒素。我们的研究中采用DA作为氧化应激诱导剂,观察了6种神经保护剂的作用效果。MTT分析其存活率、荧光双染色法观察其形态变化以及流式细胞仪分析凋亡和细胞周期变化,结果显示DA诱导后细胞存活率随浓度、时间进行式降低,而6种保护剂分别有不同程度的保护效果。     

An Effective Statistical Approach for Comparative Risk Assessment1

Comparative risk assessment is an evaluation process designed to rank environmental problems based on the severity of potential hazards. The purpose of this paper is to provide an effective statistical approach to analyze perceived environmental risks. Environmental problems, evaluative criteria, and other potential moderator variables need to be determined first, and then the risk perception data collected. Repeated measures analysis is used to first test for interactions between environmental problems and potential moderator variables. If there are no significant interactions, then the risk difference among environmental problems is tested unconditionally; otherwise the risk difference is tested conditionally. Cluster analysis for environmental problems is performed only when the risk difference is significant. The clustering results can be objectively determined by using the simultaneous T² confidence intervals. Risk-based priority setting is made according to the clusters obtained. To illustrate this approach, an empirical study of comparative socioeconomic risks in Taiwan was conducted. Socioeconomic impacts areas including social security, quality of life, production cost, investment willingness, and economic resources are used as evaluative criteria. Results indicate that selected impact areas do affect relative risk differences among 24 environmental problems, and the difference is significant for each area. Therefore, cluster analysis is conducted separately for each impact area. Risk-based priority settings for clusters of environmental problems are reported.     

充分发挥高校主力军作用切实推进西部继续教育

文章结合我国西部大开发战略的实施 ,从我国继续教育的实际工作出发 ,对高等学校在西部教育中的主力军作用、地位和任务进行了探讨 ,提出了立足市场需求 ,切实推进西部继续教育的途径和方法 ,以期对我国当前的继续教育工作有现实的指导意义     

L2TP虚拟专用网

从L2TP协定入手,介绍了L2TP协议的基本技术和拨号访问服务器及L2TP网络服务器,详细阐述了在此基础上建立的认证模块、日志模块和LAC模块,并对用L2TP创建VPN进行了探索,在多种UNIX环境下建立了原型,积累了建立VPN的经验,为其他VPN的建立打下了基础。     

长江流域酸雨危害及对策分析

在简要介绍了酸雨的成分及我国酸雨的成因的基础上,具体分析了长江流域酸雨的现状及其对森林、农作物、人体健康的危害,提出通过植物的自净作用等方法防治酸雨、解决长江流域严重的酸雨危害的初步设想。     

Parameter estimation and design considerations in prospective applications of the � chart

The effects of parameter estimation on the in-control performance of the Shewhart X¯ chart are studied in prospective (phase 2 or stage 2) applications via a thorough examination of the attained false alarm rate (AFAR), the conditional false alarm rate (CFAR), the conditional and the unconditional run-length distributions, some run-length characteristics such as the ARL, the conditional ARL (CARL), some selected percentiles including the median, and cumulative run-length probabilities. The examination involves both numerical evaluations and graphical displays. The effects of parameter estimation need to be accounted for in designing the chart. To this end, as an application of the exact formulations, chart constants are provided for a specified in-control average run-length of 370 and 500 for a number of subgroups and subgroup sizes. These will be useful in the implementation of the X¯ chart in practice.