国内传统村镇旅游发展研究评述

传统村镇旅游近年来在国内发展非常迅速。以1994—2004年中国期刊网上所收录的公开，出版发行的自然科学类、科学技术类、旅游类等中文期刊为主要范围，对国内近10年来传统村镇旅游发展文献进行了统计分析，分别从作者的研究地域与研究等题、论文发表年度以及研究内容等方面进行了研究，最后提出了国内在传统村镇旅游发展研究中的不足和发展趋势。     

关于城市环境信息系统建设的几点构想

随着城市化水平迅速提高,城市中人类活动对城市环境系统的影响不断加剧,从而产生了一系列城市环境问题.该系列问题虽然已经得到政府高度重视,但由于城市环境系统十分复杂,常规的城市环境研究手段由于缺乏技术支持和信息保障,所以至今仍未能得到很好的解决.由于城市环境信息系统结合了现代信息技术,从而能为城市环境研究提供强大的技术支持和信息保障.本文分析了我国城市环境问题的现状及其原因,探讨了城市环境信息系统的构成,介绍了建立城市环境信息系统的关键支持技术.     

厌氧-好氧(SBR)工艺治理天然橡胶生产废水工程实例

天然橡胶生产废水经三级厌氧-一级好氧(SBR)工艺治理后,可去除>97.7%的CODCr,废水水质可达到污水综合排放二级标淮.结果显示,本文中所描述的工艺是天然橡胶生产废水治理中的一种技术可行、效果稳定的工艺.     

人误屏障分析技术

在复杂工业系统中,屏障是预防与减少人误的有效方法,一旦屏障失效,事故就有可能发生。笔者从屏障的概念与屏障分析入手,分析了实体屏障和管理屏障两类基本的屏障,介绍了屏障分析的6个步骤即辨识危险和目标、辨识屏障、评估屏障是否失效、弄清原因、评估与决定、制定方案及其分析案例,进行创建和维持屏障的方案分析,建立纠正行动计划的屏障方案,指出有效使用屏障分析技术来减少人误的几个场合以及屏障分析的局限性。     

Formula allocation as a policy tool: politics and measurement

Formula allocation is a major tool for the distribution of public funds in the United States of America. This paper explores several examples of formulae used in U.S. domestic programmes, looking at their construction, meaning and consequences. The authors argue that the design of formulae is both a political and technical task. The paper concludes with a series of recommendations to improve formulae as tools of distributional policy.     

GOES IR AND DUMMY VARIABLE TECHNIQUES FOR LOW TEMPERATURE ASSESSMENT IN FLORIDA1

ABSTRACT: Geostationary Operational Environmental Satellite (GOES) thermal infrared (IR) data were used to study regional cold nocturnal temperature fluctuations that are important in assessing citrus freeze damage. Dummy variables techniques were used to analyze the temperature difference between the east and west sides of Central Florida, which was obtained from both ground measurement minimum temperature (T_GMM) and the GOES mean temperature (T_GOES) on low-temperature nights. The low temperature pattern, which was closely related to the citrus freeze damage pattern in Central Florida, was identified by GOES thermal IR data but not by conventional ground measurements. The low surface temperature in the west side and east side appears to be attributable to differences in soil types, water tables, and drainage classes in both regions.     

原油指纹识别技术

为使毛细管色谱“指纹”特征应用于污染事故的鉴定,采用分辨效能高的毛细管色谱柱及原油指纹识别技术,对江苏油田９个不同地区和来源的原油进行了分析考察,测定了油品中正构烷烃及姥鲛烷、植烷的含量。实验进一步论证了：以正构烷烃轮廓特征和姥鲛烷、植烷特征峰面积比值相结合的原油鉴别方法不受进样和色谱条件的影响,具有一定的准确性和可靠性。     

Destruction of VOCs by combination of corona discharge and catalysis techniques

The catalytic effect of alumina on the destruction of toluene, benzene, acetone and methanol, in DC pulsed corona discharge reactor was studied. In the presence of alumina the inlet concentration of the VOCs was varied from ～5×10^-6mol/L to ～80×10^-6mol/L, and their decomposition efficiency (conversion %) was found to be 99%—80% for toluene, 99%—97% for benzene, 95%—92% for acetone, and 72%—85% for methanol. Corresponding decomposition in the absence of alumina was 90%—38% for toluene, 89%—57% for benzene, 42%—30% for acetone, and 47%—19% for methanol. Feed gas flow rate was 400 cm³/min and power reading from DC source was 7.4 W in all of the experiments. Alumina also shifted the CO/CO₂ ratio in the by products in favor of CO₂. Ozone concentration at the reactor outlet was higher in the presence of alumina. Enhancement in VOCs decomposition by alumina was explained on the basis of higher concentration of ozone and its precursor atomic oxygen [O] . Decomposition efficiency (conversion %) for individual compounds was found to be inversely proportional to the ionization potential of the compound, under identical conditions. Double DC high voltage sources pulse generator was tested and found to improve VOCs decomposition compared with the conventional single DC high voltage source.      

中国粮食生产发展预测及其保证程度分析

本文讨论了中国粮食生产发展面临的４种严峻困难与挑战。按照中国基本国情及世界市场粮食资源状况，中国必须走粮食基本自给的道路。利用投入占用产出技术及系统科学方法，对２０３０年中国的粮食产量、粮食进口量及自给率进行了预测。     

基于AHP LP法的南水北调中线水资源优化配置

水资源是不可替代的重要自然资源和战略性经济资源，水资源优化配置是解决水资源问题的重要手段。为促进区域水资源供需状况相对平衡，按可持续发展的要求，根据区域水资源优化配置的含义和南水北调河北省受水区的具体情况，以有限水资源综合效益最大为目标，考虑水源可供水量、用户需水量和水环境与经济系统协调发展等约束，采用层次分析法与线性规划法相结合的方法，建立了水资源优化配置模型，并对模型的目标函数、约束条件和主要参数确定进行了初步探讨。最后用该模型进行了南水北调河北省受水区2005年和2010年95%保证率下的水资源优化配置研究，并对求解结果进行了分析、评价及展望。结果表明，南水北调工程实施后，能够解决河北省受水区严重缺水的状况。