碳交易机制下企业产品线定价机制研究

研究了碳交易机制下企业产品线的定价问题,以不同产品的减排率和相应的零售价为决策变量,构建了以企业产品总利润最大化为目标函数的产品线定价模型.由于产品线上的产品定价及产品不同的减排率会影响产品市场需求,通过非线性规划模型进行分析和求解,得到了企业不同产品的最优定价和最佳减排率的组合,使顾客可以根据自身效用的不同,在不同减排率的产品间进行自发选择,从而实现企业利润最大化.     

隔井脉冲注水在提高油田采收率方面的应用

进入水驱后期，开采油田的剩余油高度分数，分流线和主流线的剩余油饱和度存在明显差别，运用水动力方法不断改变渗流场的流线分布是提高采收率的有效途径。常规脉冲注水（周期注水）显示了良好的运用前景，但是最佳参数难以把握，停注比过大引起地层能量过分下降，反而导致降水降液不增油，达不到预期的效果。     

类胡萝卜素代谢途径中相关番茄红素环化酶的功能

番茄红素环化是其生物合成途径中的一个关键分支点。自然界存在两类氨基酸序列不相关的番茄红素环化酶，其中单体型环化酶在成环的化学机理，底物特异性和活性，蛋白特征及氨基酸序列保守性等方面的存在相似性，包括G^-细菌的番茄红素环化酶CrtY，蓝藻的CrtL，以及绿藻和植物的Lyc-B／E及相关的Ccs和Nsy。另一类异二聚体型番茄红素环化酶则存在于G^＋细菌，古生菌和真菌中，其催化机理和需要的辅因子尚待进一步证实。     

Mechanism for SOFC anode degradation from hydrogen sulfide exposure

Recent results on solid oxide fuel cells with Ni/YSZ and Ni/GDC anodes reveal a mechanism for permanent performance degradation due to hydrogen sulfide exposure. Our results confirm the temporary performance decline observed by others but also reveal a mechanism for the long term permanent degradation. We find that hydrogen sulfide leads to nickel migration and depletion in the anode, thereby compromising electrical conductivity and cell performance.     

Analysis and calculations of steel tube confined concrete (STCC) stub columns

The use of steel tube confined concrete (STCC) columns has been the interests of many structural engineers. A finite element analysis (FEA) model was established in this paper to analyse the mechanisms of STCC stub columns under axial compression. It was found that both the predicted ultimate strength and load versus deformation curves show generally good agreements with those of the measurements. The interaction between the steel tube and its concrete core was analysed and illustrated by using the FEA model. Simplified formulae were proposed by using the regression method based on the parametric analysis outcome.     

Modification of the surface reactivity and selectivity of mixed oxides in oxidation reactions due to coadsorbate species

The influence of coadsorbate species on the surface properties of mixed oxides in the selective oxidation of hydrocarbons is shown to highlight the concept of the possibility to tune the reactivity and selectivity with gas phase dopants and the role of coadsorbate species in the reaction mechanism of selective oxidation. Although few literature data are available on these topics, the examples discussed illustrate that a better understanding of these phenomena is a key to the design of better catalysts and a critical factor in understanding the real nature of the surface processes during the catalytic reaction.     

Surplus equivalence of leveled commitment contracts

In automated negotiation systems consisting of self-interested agents, contracts have traditionally been binding. Leveled commitment contracts—i.e., contracts where each party can decommit by paying a predetermined penalty—were recently shown to improve expected social welfare even if agents decommit strategically in Nash equilibrium. Such contracts differ based on whether agents have to declare their decommitting decisions sequentially or simultaneously, and whether or not agents have to pay the penalties if both decommit. For a given contract, these mechanisms lead to different decommitting thresholds, probabilities, and expected social welfare. However, this paper shows that each of these mechanisms leads to the same social welfare when the contract price and penalties are optimized for each mechanism separately. Our derivations allow agents to construct optimal leveled commitment contracts. We show that such integrative bargaining does not hinder distributive bargaining: the surplus can be divided arbitrarily (as long as each agent benefits), e.g., equally, without compromising optimality. Nonuniqueness questions are answered. We also show that surplus equivalence ceases to hold if agents are not risk neutral.     

土壤有机态Cd转(活)化的影响因子及其综合作用

为实现重金属污染土壤的修复 ,本文讨论了土壤有机态Cd转 (活 )化的影响因子及其综合作用。根据统计学的判别分析发现 :EM菌为其主导影响因子 ,而非以往形态转化研究中所说的pH ,其作用机制可能主要是生物降解 ;就影响因子的综合作用效果而言 ,在有机态Cd向活化态Cd转化中 ,有效的处理组合是随着土壤 pH的改变而变化的 :pH 6.5时 ,以EM菌 1%、C/N 2 0为最佳。pH 7.0时 ,以EM菌 1%、C/N =3 5为最宜。pH 7.5时 ,EM菌 3 %、C/N =3 5才最适 ;本研究条件下有机态Cd减少和活性态Cd增加的协同转化率为 11.5 %。本研究为重金属污染土壤的修复提供了重要的理论依据     

一种机构系统的虚拟样机设计

基于机构原理的机械系统设计往往是一个比较复杂的过程。文章以贴标机设计为例,借助虚拟原型和CAE技术,实现了一种贴标机的虚拟样机设计,并进行了参数设计优化、虚拟样机仿真和设计验证。     

基于网络的协同CAD特征建模技术研究

探讨了协同工作模式和建模的需求，论述了一种结合C／S和B／S结构优势的三维CAD协同建模系统的结构和实现，通过对三维以数化特征技术，网络通信技术和特征编码技术等关键技术的研究，初步实现了局域网环境下零件级产品协同参数化造型设计和Internet上的模型信息发布。