如何确定有色金属的价格

在经济评价中,投入物与产出物价格的确定是至关重要的评价因素。因此,合理地确定投入物与产出物的价格是进行项目经济评价的先决条件。那么,针对有色金属行业的项目经济评价,讨论如何合理地确定有色金属的价格。     

钼粉清洁生产评价

针对清洁生产评价指标的选取原则,结合钼粉生产的特点,建立了包括原材料、生产工艺与设备、产品、资源、污染物与资源回收利用在内的钼粉清洁生产评价指标体系,采用专家打分法确定权重,并根据评价基准值确定定量指标的评价指数,进而构建了钼粉清洁生产水平的评价方法。     

钼粉清洁生产评价

针对清洁生产评价指标的选取原则,结合钼粉生产的特点,建立了包括原材料、生产工艺与设备、产品、资源、污染物与资源回收利用在内的钼粉清洁生产评价指标体系,采用专家打分法确定权重,并根据评价基准值确定定量指标的评价指数,进而构建了钼粉清洁生产水平的评价方法。     

基于D-S证据理论—正态隶属度的岩土边坡稳定性评价

针对岩土边坡稳定性评价具有模糊性和不确定性且各评价指标存在矛盾冲突性的特点，提出了基于D-S证据理论的岩土边坡稳定性综合评价方法。首先建立识别框架，选取评价指标，运用正态隶属函数确定各等级对应的质量函数。然后基于各等级质量函数间的距离，综合考虑各指标各等级之间的相互影响程度，确定指标权重。最后运用D-S组合规则，得出岩土边坡稳定性等级。将D-S证据理论评价模型运用到广州某稀土矿山工作场地，并将该方法与可拓法在质量函数与关联度、权重确定和评价结果等方面进行比较，结果表明D-S证据理论评价模型相对合理，所得结果精度较高并且与工程实际相吻合。     

基于DEA的黄金矿山经济效益评价模型研究

使用数据包络分析方法, 通过确定适当的评价指标, 综合评价了黄金矿山的经济效益, 并准确的分析的主要指标的投入多余量, 或产出不足量, 为矿山的微观经济分析提供了有效可行的技术手段, 计算结果合理有效, 印证了矿山的生产经营实际。     

基于变权联系云的采空区稳定性二维评价模型

针对采空区稳定性评价具有模糊性、随机性以及评价指标等级呈有限区间正态分布等问题,考虑评价指标值突变对评价指标权重的影响,提出了基于变权联系云的采空区稳定性二维评价模型。首先选取12个评价指标构建采空区评价指标体系,并通过各指标联系云图反映其实际分布情况;然后利用博弈论和变权理论得到变权权重;最后计算采空区各评价指标对应等级的确定度和采空区的综合确定度,并根据最大隶属度原则确定采空区稳定性等级。为解决指标等级归属不一致的问题,引入模糊熵作为第二维评价系统,以表征采空区稳定性的复杂度。结果表明:变权联系云模型评价结果与实例应用结果一致,验证了该模型的可行性与合理性。     

企业集约经营的量化分析与评价

本文在对集约经营理论研究的基础上,提出了评价企业集约经营水平－ 集约经营度的概念,运用定量分析方法构筑了对集约经营进行量化分析评价的新思路,建立了评价指标体系模型,并根据专家调查结果,运用层次分析法确定了模型中各指标的权重,为评价企业集约经营水平提供了可操作的工具。     

中国城市社区居民满意度评价体系的构建

结合主成分分析法和层次分析法(AHP)给出一种合理的中国城市社区居民满意度评价指标体系构建方法.首先选取大连市5种类型社区467位居民为样本,对众多影响社区居民满意度的因素进行分类,得出三级指标,并利用主成分分析法提取少数几个关键因子作为二级指标,再运用AHP 和专家调查法确定各因素在每一层级中的权重,最终获取城市社区居民满意度评价体系.     

中铝中州分公司人均氧化铝产量国内同行业第一

在近日召开的中国有色金属行业建设协会项目管理创新评审大会上，中州分公司选矿拜耳法第二条生产线工程以92．4分的高分获得了有色金属行业项目管理创新一等奖。     

浅谈工业经济效益评价指标体系

如何正确评价工业经济效益,我国理论界、经济界和统计部门进行了长期的探索.工业经济效益评价指标,随着实践的发展经过了几度变迁.“九五“期间,国家统计局修订颁发了新的工业经济效益评价指标体系,并在全国推行.新的工业经济效益评价指标体系由六项指标和一个综合指数组成,较好地体现了工业经济效益的实际运行情况,正确认识并运用这套指标体系,对加强企业管理,提高企业的经济效益必将产生积极的导向作用.     

烧结矿中CaO，MgO，Al2O3的湿法滴定分析

采用混合熔剂快速熔融试样,盐酸低温溶解熔球,1．5ml硝酸充分溶解,制备母液．分别移取3份母液,以钙指示剂为指示剂,加入少量Mg^2＋,EDAT标准溶液滴定CaO;以铬黑T为指示剂,EDAT标准溶液滴定MgO;以PAN指示剂,用硫酸铜标准溶液滴定Al2O3,滴定终点均突变明显．本法具备快速、准确、设备简单、分析成本低的特点,效果良好,特别适用于小型工厂实验室的日常分析．并在生产中已得到了应用．     

三氯化钛还原-重铬酸钾滴定法测定球团矿中TFe

采用碱混合熔剂熔融试样,熔融物以热水浸取盐酸酸化后,用SnCl2-TiCl3将Fe3+还原为Fe2+,以钨酸钠为指示剂指示还原终点;在硫磷混酸介质中,以二苯胺磺酸钠为指示剂,用重铬酸钾标准溶液滴定球团矿中TFe含量。该法测定TFe的绝对误差<0.15%,避免了用重铬酸钾氧化褪去钨蓝色泽时易引入的误差。     

Quickening and damping a feedback display.

Difficulty in controlling an all-weather interceptor under emergency conditions was explained as the result of negative quickening of the indicator display inadvertently introduced by the use of a standard instrument in an aircraft with a sloping instrument panel. To determine the combination of quickening and damping in the indicator display that would optimize performance, 4 angles of tilt of the gyro (to accomplish positive quickening) and 4 damping levels were tested. A combination of 5° tilt and 500% was optimum and demonstrated superiority over the standard turn indicator, showing a smaller decrement of performance upon attitude indicator failure than did the control instrument. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The latent structure of childhood aggression: A taxometric analysis of self-reported and teacher-rated aggression in Israeli schoolchildren.

The purpose of this study was to determine whether the latent structure of childhood aggression, like the latent structure of adult antisocial behavior, is dimensional. One thousand and five Israeli schoolchildren completed a translation of the Buss-Perry Aggression Questionnaire (AQ; Buss & Perry, 1992) and were rated by their homeroom teachers on the Eyberg Child Behavior Inventory (ECBI; Robinson, Eyberg, & Ross, 1980). The AQ Physical Aggression and Verbal Aggression scales were combined to form the 1st indicator, the AQ Anger and Hostility scales were combined to form the 2nd indicator, the 10-item ECBI Oppositional Defiant Behavior Toward Adults scale composed the 3rd indicator, and the 8-item ECBI Conduct Problem Behavior scale composed the 4th indicator. Subjecting these indicators to taxometric analysis revealed consistent support for dimensional latent structure in the full sample as well as in 5 of the 6 subsamples. Childhood aggression, it would seem, differs quantitatively along a dimension (degree of aggression) rather than bifurcating into qualitatively distinct categories (aggressive vs. nonaggressive). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

钨矿物伴生元素铜、锌的快速连续测定

采用盐酸—氯酸钾—硝酸分解试样,以硫酸铵—氨水—乙醇为介质,将铜、锌与铁、铝、汞、铅、锰等元素分离。吸取两份滤液,一份用碘量滴定法测定铜,即用乙酸铵调节酸度,在pH3.0～4.0的微酸性溶液中,铜(Ⅱ)与碘化钾作用析出碘,以淀粉作指示剂,用硫代硫酸钠标准溶液滴定;一份用EDTA络合滴定分析法测定锌,即在pH5～6的乙酸—乙酸钠缓冲溶液中,以二甲酚橙为指示剂,用EDTA标准溶液滴定。适用于钨矿石中1%以上铜和1%以上锌的测定。     

Complex feedback displays in a man-machine system.

Performance of 9 AF pilots was studied under 3 simulated flight conditions: reference (full instrument panel), control (attitude indicator covered), experimental (turn indicator covered, integrated roll and turn indicator substituted). "Two principles of design display are supported by the data: a. The command effectiveness of a feedback display is increased by the distinct indication therein of control-induced components of the system output. b. The command effectiveness of a feedback display is increased by anticipatory indication therein of the feedback signal." (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于粗糙集理论的地学空间关系规则分析及其应用——以珠江三角洲为例

Spatial relations, reflecting the complex association between geographical phenomena and environments, are very important in the solution of geographical issues. Different spatial relations can be expressed by indicators which are useful for the analysis of geographical issues. Urbanization, an important geographical issue, is considered in this paper.The spatial relationship indicators concerning urbanization are expressed with a decision table. Thereafter, the spatial relationship indicator rules are extracted based on the application of rough set theory. The extraction process of spatial relationship indicator rules is illustrated with data from the urban and rural areas of Shenzhen and Hong Kong, located in the Pearl River Delta. Land use vector data of 1995 and 2000 are used. The extracted spatial relationship indicator rules of 1995 are used to identify the urban and rural areas in Zhongshan, Zhuhai and Macao. The identification accuracy is approximately 96.3%. Similar procedures are used to extract the spatial relationship indicator rules of 2000 for the urban and rural areas in Zhongshan, Zhuhai and Macao. An identification accuracy of about 83.6% is obtained.     

烧结矿中CaO,MgO,Al_2O_3的湿法滴定分析

采用混合熔剂快速熔融试样,盐酸低温溶解熔球,1.5 ml硝酸充分溶解,制备母液.分别移取3份母液,以钙指示剂为指示剂,加入少量Mg2+,EDAT标准溶液滴定CaO;以铬黑T为指示剂,EDAT标准溶液滴定MgO;以PAN指示剂,用硫酸铜标准溶液滴定Al2O3,滴定终点均突变明显.本法具备快速、准确、设备简单、分析成本低的特点,效果良好,特别适用于小型工厂实验室的日常分析.并在生产中已得到了应用.     

城市生态环境保护建设评估指标及模式研究

根据对提供的样本必须具有客观性、完整性、代表性和权威性的统计学要求，从原始监测数据中优选出11项因子，作为城市生态环境保护与建设现状的评估指标，确定了各项指标的统计权重，单项指标分值的统计方法和单个城市的生态环境保护与建设现状的评估模式，并对某省在“九五”期间各主要城市的生态环境保护与建设现状进行了模拟评估，其结果的客观性较好，可比性和直观性令人满意。     

建立新一代钢厂精准设计评价指标体系的研究

新一代钢厂的设计水平对钢厂的实际运行水平具有决定性的影响.为了提高新一代钢厂的精准设计水平,按照系统性、层次性等原则建立了新一代钢厂精准设计评价指标体系.指标体系包含49个末端指标和16个中间指标,分为经济投资水平、工艺设备水平、流程运行高效化、生态化水平四大类指标.该指标体系能反映新一代钢铁制造流程装备、工艺先进、流...