火力发电厂循环水泵双速节能改造

降低厂用电率,合理调配设备运行方式是每个电力企业急需解决的问题。循环水泵是用电量较大的辅机设备,为此对胜利发电厂Ⅰ期循环水泵改为高、低速运行的经济性进行分析,论证了循环水泵改为双速控制的节能改造方案。     

基于变精度粗糙集的水泥企业盈利能力评价

传统粗糙集分类要求苛刻和分类结果单调,既不能充分利用原有信息,也容易导致求出的属性指标的权重雷同.变精度粗糙集降低了分类的要求,不仅使分类更为丰富,而且更能充分利用原有信息,求得的属性指标权重一般不会雷同.运用变精度粗糙集和TOPSIS对我国部分上市水泥生产企业的盈利能力进行了评价.首先运用变精度粗糙集求出评价指标的权...     

利用底吹熔炼技术处理含铜贵多基固废物料

利用底吹熔炼炉对原料适应性强的特点，对底吹熔炼技术处理含铜多基固废及高含镍铂钯物料的工艺控制过程进行研究，摸索最佳工艺控制参数，并探索Au、Ag、Pt、Pd等贵金属元素及伴生杂质元素在铜锍中的富集情况，形成了底吹炉系统处理含铜多基固废和高含镍铂钯物料高效回收贵金属的技术，为提高铜冶炼系统处理杂料量和盈利能力提供技术保障。     

Supplier selection under risk of delivery failure: a decision-support model considering managers’ risk sensitivity

This paper studies the problem of supplier selection and order allocation in a retail supply chain (comprising suppliers, a central purchasing unit and outlets) under disruption risk. The final demand is deterministic. Suppliers are located in different geographic areas, and supplies are subject to a positive probability of disruption. Different capacity and failure probabilities for each supplier are considered. Our analysis focuses on the insurance versus profitability trade-off faced by a supply manager who buys from suppliers for the outlets. Instead of determining optimal decisions given an objective function and the risk sensitivity of the decision-maker, we use a mixed integer linear programming approach to provide decision-making support that shows a supply manager the ‘elasticity of (expected) losses versus (expected) profits’. Under this model, and depending on the profit-and-loss targets, a supply manager of known risk sensitivity (i.e. risk aversion and loss aversion) can make better decisions when choosing suppliers. Moreover, taking into account, the impact of the share of fixed costs that must be covered by the operation, we consider the net values of expected profit and loss. We discuss the potential influence of the level of the firm’s fixed costs on the supply strategy. In particular, we show how the minimum value of the gross margin needed for the strategy’s profitability affects that strategy. A numerical application is conducted to illustrate the contribution of our decision-making support mechanism, and several managerial insights are obtained.     

Size preferences and behaviors of native yellow perch foraging on invasive round gobies

Predation is one of the primary mechanisms that shape aquatic food webs and predator–prey interactions are typically highly dependent on sizes of both forager and its prey. Round goby Neogobius melanostomus is a recent invader to the Great Lakes and can be an important prey item for native predators. However, predation patterns on round gobies have received limited attention. We assessed size-specific predator–prey interactions between invasive round gobies and native yellow perch Perca flavescens by comparing prey preferences for three size classes of adult yellow perch foraging on six size classes of round gobies. Small yellow perch preferred the smallest round gobies available, medium sized yellow perch increased the range of round goby sizes consumed but still preferred smaller prey, whereas large yellow perch consumed larger round gobies and excluded the smallest prey size. Yellow perch foraging behaviors indicated that intermediate sizes of round gobies were struck at most frequently and that pursuit and handling time increased whereas capture efficiency and prey profitability decreased with round goby size. Our results indicate that predator–prey interactions between yellow perch and round gobies may be size dependent and heavily influenced by capture efficiency and prey profitability.     

电网经营企业客户盈利能力分析的必要性

电力体制改革后,电网经营企业的总体利润水平偏低,这其中既有客观原因,也有企业自身的问题。对电网企业而言,缺乏对客户盈利能力的分析,没有针对不同客户提供相应服务是原因之一。客户盈利能力分析不仅能帮助电网经营企业识别不同客户对利润的贡献,还可以帮助企业识别并提高作业效率,从而提高企业整体的盈利水平。     

风险投资项目的全程监控--项目选择、经营绩效评价和不同退出方式的收益比较

提出风险投资不仅是一种理性行为,而且是一个可持续发展的过程.风险项目初选时,应以产业生命周期理论为依据,并依此建立风险项目的筛选模型.进行风险项目的运行时,应该以未来投资收益的最大化为目标,对项目运行效果进行实时评价,AHP方法是一种简单易行的风险项目的定量评价模式.得出了风险项目不同退出方式决定了最终收益,而其退出方式很受宏观经济条件的制约,密切联系实际并对各种方式进行客观比较选择非常重要的结论.     

200MW汽轮机通流部分改造及其经济性分析

百年电力发展股份有限公司6号机组由于受当时设计水平和加工工艺的限制,随运行时间的增长热耗升高,效率偏低,经济性越来越差。为此,公司利用大修期间采用先进的全三维技术对通流部分进行了技术改造,改造后机组的考核试验表明改造取得了明显的节能降耗效果。分析了机组改造的经济性,指出了仍然存在的主要问题。     

上市公司盈利能力因子分析——基于重庆市上市公司实证研究

以重庆市26家上市公司为样本,利用其2004年年报数据,运用因子分析法,分别从利润指标角度和现金流量指标角度衡量样本公司盈利能力.研究发现,从利润指标角度和现金流量指标角度衡量的企业盈利能力存在很大的差异.在对差异进行分析后,提出应以利润指标角度为基础,以现金流量指标角度为辅,对上市公司盈利能力进行分析.     

铂铼重整催化剂的最佳氯含量

以正庚烷为原料,采用加压微反－色谱装置考察了铂铼重整催化剂活性,选择性和稳定性与催化剂氯含量的关系。据此得出了ＣＢ－６、ＣＢ－７催化剂的最佳氯含量分别为１．０５％和１．１１％,并在中型装置上验证了所得结论。同时分析了氯的作用机理,并对重整过程中控制最佳氯含量所得的经济效益进行了估计。