示波极谱法对酚类化合物的分析

用示波极谱法对酚类化合物进行分析，方法的线性范围在３．０×１０￣（－５）～８．０×１０￣（－３）ｍｇ／Ｌ之间，最低检出限为６．０×１０￣（－６）ｍｇ／Ｌ，浓度为０．２６×１０￣（－２）～０．５２ｍｇ／Ｌ时的相对标准偏差为１．８％～４．０％，浓度为０．３×１０￣（－２）～０．５１ｍｇ／Ｌ时的回收率为９５．０％～１０２．１％，其结果与４－氨基胺替比林分光光度法相一致。     

废物库周围地下水中的放射性核素铀和锶-90分布研究

中国工程物理研究院核　物理与化学研究所原工作地点（老点）存在两个放射性废物库５３７－１和５３７－２。年内分别在库周围取地下水（或土）６次，对５３７－１得到地下水和泥土中的铀含量大约为１．２７μｇ／Ｌ和３．０μｇ／Ｌ，对５３７－２得到的地下水中的９０Ｓｒ含量约为５．３５×１０－３Ｂｑ／Ｌ。上列数据与本底无明显差异。可见，５３７－１废物库周围地下水中铀含量与生活区河水中含量无明显差异，５３７－２废物库周围地下水中锶含量与生活区河水中含量也无明显差异。至今未监测到两个废物库中的放射性核素对周围地下水中的明显　影响。     

UASB—Fe反应器处理城市污水中试研究

本文对ＵＡＳＢ－Ｆｅ装置处理城市污水进行了中试研究，结果表明，当厌氧ＨＲＴ３－４小时，进水浓度总ＣＯＤｃｒ为２４１．２－４０２．３ｍｇ／ｌ，溶ＢＯＤ５为８０．６－１３６．８ｍｇ／ｌ，ＳＳ为１７０．８－１８９．８ｍｇ／ｌ时，其平均去除率依次为４２．１－５６．６％，６４．０－３９．８％和７２．９－６５．４％。讨论了厌氧ＨＲＴ，进水浓度，温度等因子对厌氧处理效果的影响情况。浅析了铁填料层在城市污水处理中     

广元市道路贯穿辐射剂量水平研究

本文在广元市环境天然放射性水平调查的基础　上，通过对全市范围道路贯穿辐射剂量水平进行分析和研究，得出：（１）道路陆地γ辐射剂　量率为（６．４３±１．２１）×１０－８Ｇｙｈ－１；（２）道路贯穿辐射剂量率为（９．６６±１．３　５）×１０－８Ｇｙｈ－１；（３）道路γ辐射剂量水平与道路贯穿辐射剂量水平的地理分布　相似。即：北部中山区最高，东南低山区和东部次之，中部河谷平坝区和西南低山区最低。　（４）依不同路面材料，其道路陆地γ辐射剂量率的排列顺序为：泥土路＞碎石路＞砖路＞柏　油路＞水泥路。     

单扫描示波极谱法测定环境水样中马拉硫磷残留量

本文拟定了一种测定马拉硫磷残留量的极谱法，在０．１ｍｏｌ／ＬＮａＯＨ基底溶液中，用单扫描示波极谱仪制作其阴极化一阶导数极谱曲线，峰电位Ｅｐ为－０．４２Ｖ（ｖｓ．ＳＣＥ），在０．０８－０．５μｇ／ｍｌ范围内ｉ＇ｐ与浓度间呈线性关系。讨论了一些常见农药及离子的干扰情况，以及影响溶出峰电流的因素。方法应用于环境水样中马拉硫磷残留量的测定。变异系数在１０％以内。     

UASB处理酒精废液颗粒污泥形成过程与运行效果的研究

本试验采中中温ＵＡＳＢ反应器处理酒精废液，通过启动、运行、颗粒污泥不同时期形成过程的探索，成功地培养出了颗粒污泥，取得了有机负荷高达１３－２２ｇＣＯＤ／ｌ．ｄ，ＨＲＴ１５．６－２２．３ｈｒ，ＣＯＤｃｒ去除率达８３．９－９２．２％，沼气产气率５．１－８．７１／ｌ．ｄ，ＣＨ４含量５５－７２％的良好效果。     

内江市磷肥厂磷矿石,磷肥样品中天然铀,镭—226含量分析

本文报道了内江市８个磷肥的磷肥及其原料矿石中天然铀，＾２２６Ｒａ含量水平，其结果为，磷肥样品中＾２２６Ｒａ含量２４５．８±１１２．９Ｂｑ．ｋｇ＾－１，天然铀含量２７．２±１６．４ｐｐｍ；磷矿石样品中＾２２６Ｒａ含量４０７．６±９４．３Ｂｑ．ｋｇ＾－１，天然铀含量３１．４±２１．０ｐｐｍ。     

采用新型载体的好氧流化床的动力学研究

本文以稀释的味精废水为基质,对采用新型载体ＬＳＡＲ的好氧生物流化床进行动力学研究,求得动力学参数分别为γｍａｘ＝８．８１（ｇＣＯＤ／ｇｖｓ．ｄ）,Ｋｓ＝０２８９（ｇＣＯＤ／Ｌ）,Ｋｄ＝０．０４６ｄ＾－１,Ｙ＝０．１６（ｇｖｓ／ｇＣＯＤ）。其值基本处于文献的报导之内,说明以ＬＳＡＲ为载体的好氧微生物膜具有较好的活性,ＬＳＡＲ作为好氧流化床载体是可行的。     

乌鲁木齐河跃进桥蒸发观测实验

Ｅ６０１ｋ型玻璃钢蒸发器与Ｅ６０１型水面蒸发器比测实验取得成功，两套Ｅ６０１Ｋ型蒸发量相近，比铁制Ｅ６０１型水面蒸发器蒸发偏大８．５％，系数偏大０．０６。用Ｅ８３型土壤蒸渗仪测定草地、裸地和云杉蒸发量，５月－１０月份分别为４９１．９ｍｍ，４３３．６ｍｍ和３７９．７ｍｍ（云杉为６月－１０月份）。     

分光光度法测定COD_(Cr)的试验条件选择

用分光光度法测定水中化学需氧量ＣＯＤＣｒ,通过正交试验选择氧化的最佳选择。试验结果表明对ＣＯＤＣｒ值为５０～１０００ｍｇ／Ｌ的水样：氧化剂Ｋ２Ｃｒ２Ｏ７用量为０．２０～０．４０ｍｏｌ／Ｌ,催化剂Ａｇ２ＳＯ４用量为１０ｇ／ＬＨ２ＳＯ４,消解时间１０ｍｉｎ,加热温度１８０℃。用ＣＯＤＣｒ为１３８ｍｇ／Ｌ的质控标样进行验证试验,其绝对误差为０．５～３．０ｍｇ／Ｌ。与标准方法相比用分光光度法测定ＣＯＤＣｒ具有分析误差小,省时、省力,节约药剂的特点。     

MULTIVARIATE ANALYSIS OF WATER QUALITY AND PHYSICAL CHARACTERISTICS OF SELECTED WATERSHEDS IN PUERTO RICO1

ABSTRACT: Multivariate analyses were used to develop equations that could predict certain water quality (WQ) conditions for unmonitored watersheds in Puerto Rico based on their physical characteristics. Long term WQ data were used to represent the WQ of 15 watersheds in Puerto Rico. A factor analysis (FA) was performed to reduce the number of chemical constituents. Cluster analysis (CA) was used to group watersheds with similar WQ characteristics. Finally, a discriminant analysis (DA) was performed to relate the WQ clusters to different physical parameters and generate predicting equations. The FA identified six factors (77 percent of variation explained): nutrients, dissolved ions, sodium and chloride, silicacious geology, red ox conditions, and discharge. From the FA, specific conductance, sodium, phosphorous, silica, and dissolved oxygen were selected to represent the WQ characteristics in the CA. The CA determined five groups of watersheds (forested, urban polluted, mixed urban/rural, forested plutonic, and limestone) with similar WQ properties. From the five WQ clusters, two categories can be observed: forested and urban watersheds. The DA found that changes in forest cover, percent of limestone, mean annual rainfall, and watershed shape factor were the most important physical features affecting the WQ of watersheds in Puerto Rico.     

游客市场细分研究

了解游客需求是旅游产品规划、开发和市场营销的前提,把握客源市场的一个重要途径是进行市场细分。旅游企业针对不同的细分市场,采用不同的营销手段,提供相应的产品和服务,才能使游客拥有更好的旅游经历。根据四川省旅游游客的需求进行市场细分,采用聚类分析方法将游客市场分为6类:康乐型游客、享乐型游客、规矩型游客、消极型游客、商务型游客和求知型游客。在此基础上,分析了6类游客的人口特征及其市场营销的意义。     

结构方程模型在城市研究中的应用述评

以CNKI数据总库上关于结构方程在城市方面研究的文章为数据源,提取高频关键词形成共词矩阵。依据共词分析理论,对共词矩阵进行因子分析、聚类分析和多维尺度分析,目的在于归纳总结结构方程的已有应用领域、发展现状及其可能的发展趋势,为从事结构方程相关研究的学者提供信息参考。结果表明,结构方程模型的研究热点可分为两方面,一方面是对结构方程模型的理论研究,另一方面是结构方程模型在心理学与企业经济方面的应用。理论研究类团内部结构松散,研究尚不成熟,有待进一步进行整合与研究;应用范围逐渐扩大,但理论与应用之间的联系不紧密,仍具有发展空间;模型与新技术结合的研究较少,应引起关注。     

基于数据挖掘技术的超市顾客群研究

利用SPSS Clementine 10.1数据挖掘工具,遵循CRISP-DM模型的商业目标、数据理解、建立模型的流程对超市顾客进行分析研究。提出衡量超市客户忠诚度的忠诚度系数指标,建立忠诚度—盈利性顾客细分模型,运用k-means算法对超市顾客进行聚类分析,帮助超市企业准确识别不同类型的顾客群,尤其是忠诚的高盈利顾客。再利用所建立的序列分析模型分析顾客类别变化路径,预测顾客价值变化趋势,及早发现潜在价值顾客,使其尽早成为企业忠诚的高价值顾客,实现超市企业利润的有效提升,最终在日益激烈的商业竞争中立于不败之地。     

基于共词分析的复杂网络研究现状分析

以CNKI总库上有关复杂网络的相关文献为数据源,在共词分析的基础上通过多维尺度分析方法和战略坐标分析方法探析复杂网络在我国的研究现状及发展趋势,为从事复杂网络研究的学者提出参考.结果表明:①复杂网络的研究可分为两类,一类是复杂网络的理论研究,另一类是复杂网络的管理和安全方面的研究,这两个研究领域联系不紧密.②复杂网络的理论研究涉及复杂网络拓扑统计性质、演化机制与稳定性等,该领域整体联系比较紧密,研究趋向成熟.复杂网络管理、安全类团内部结构松散,研究尚不成熟,但与复杂网络中其他研究结合紧密,有进一步的发展空间.③在复杂网络的理论研究方面,与复杂系统、加权网络、拓扑结构、同步、稳定性、神经网络相关的研究领域可能成为今后研究的热点领域;在复杂网络管理、安全方面,SNMP将有可能成为热点研究项目.     

Group utility indifference and resource management decision making

Natural resource managers often rely on the advice of specialists to aid decision making. However, disagreement among these specialists about the relative value of particular management objectives or the risks associated with implementing certain management strategies may complicate the decision effort. Multiattribute utility analysis can facilitate decision making by indicating how attributes of a problem are weighed by individual specialists. This information can then be used to outline bands of potential problem solutions that are acceptable to the advising group and may allow management to further its own objectives (possibly increased efficiency).An example is presented that relates to fire management planning efforts on national forests. Multiattribute utility functions developed from a survey of fire management professionals are used to identify utility-maximizing fire management strategies based on each strategy's level of economic efficiency and risk. Bands of utility-indifferent potential solutions are outlined based on measures of group consensus. It is pointed out that a subset of these would further management's goal (increased efficiency) without significantly altering the value assigned to the risk attribute by the specialists. Finally, the robustness of the technique is discussed with particular reference to environmental management problems and the role that proxy information often plays in decision making.     

TEMPORAL AND SPATIAL CHARACTERIZATION OF RAINFALL OVER CENTRAL AND SOUTH FLORIDA1

requency evaluation and spatial characterization of rainfall in Central and South Florida are presented. Point frequency analysis performed at all available sites has shown that the 2‐parameter Gamma probability density function is the best model for monthly rainfall frequency over Central and South Florida. The model's parameters estimated at 145 stations were used to provide monthly rainfall estimates for 10‐ and 100‐year dry and wet return periods. Experimental and theoretical variograms computed for these estimates, as well as the Kriging estimation variance maps, show that the existing rain gage network is less capable of resolving monthly rainfall variation in the wet season than the dry season. May is the dry‐to‐wet transition month, while October is the wet‐to‐dry transition month with average rainfall of 4.5 inches. Monthly average rainfall is above 7 inches during the wet season and below 3 inches during the dry season. Two‐thirds of the annual rainfall is accumulated in the wet season. Annual average rainfall is maximum (above 60 inches) in many areas along the east coast, and is minimum (below 45 inches) in many areas over Lake Okee‐chobee and Central Florida. Rainfall maps show a changing pattern between the wet and the dry seasons. Frontal rainfall occurs in the dry season, while convective rainfall, tropical depression, and hurricanes occur in the wet season. Average rainfall is higher along the east coast area in the dry season and it is higher along the west coast area in the wet season.     

上市航空公司盈利能力综合评价

自2008年以来,我国航空业一直处于发展低谷,评价航空公司的盈利能力及分析提高盈利能力的对策是一关键问题.许多学者习惯于应用单一的评价方法对航空上市企业进行评价,然而在对同一批航空上市企业进行评价时,不同的方法得出了不同的评价结果.基于此状况,提出一种系统的综合评价方法,并对全国12家典型航空上市企业进行综合评价,克服了以往应用单一方法在评价中的片面性,使评价结果更加全面客观.     

基于GIS的中国各地区生态安全模式分析

生态安全是整个生态经济系统和可持续发展的生态保障,是区域或国家其它安全的载体和基础。采用经济合作和开发组织(OECD)与联合国环境规划署(UNEP)共同提出P—R—S模式,构建包括资源环境压力、资源环境状态和人文环境响应3个项目23个指标的指标体系,定量估计了中国31个地区的生态安全指数,利用ArcView GIS 3.2进行空间叠合分析和聚类分析,提炼出12个生态安全模式,表明中国各个地区的生态安全呈现多元化。