生产企业合同交货期确定及合同排序

讨论了企业订货合同管理中面临的决策问题以及解决途径。应用机器工件调度理论求解包括提前和延期惩罚的合同排序问题，给出了启发式排序规则和求解搜索策略。采用了3种启发式方法：1）接排序规则排序；2）对初始排序施加成对交换技术改善；3）射束搜索技术。实验结果表明，第3种求解质量具有明显优势，能得到令人满意的结果。     

AutoCAD扩展图元数据在地籍测量中的应用

本文对AutoCAD中扩展图元数据(XDATA)的数据格式进行了详细分析,介绍了扩展图元数据在AutoCAD中添加、访问和使用的方法,讨论了扩展数据在地籍测量中的具体应用,对从事地籍测量工作的技术人员有一定的借鉴作用。     

Liberty,equality, and impossibility: some general results in the space of ‘soft’ preferences

This paper is concerned with examining the mutual compatibility of the ethical principles of equity and liberty in a social choice framework of ordinally formulated vague preferences. With sufficiently weakened versions of the liberty and equity principles, one can secure an existence result in a ‘relation‐functional’ setting. However, difficulties tend to re‐appear in a ‘choice‐functional’ setting, when one subscribes to the notion that while preference may be vague, choice must perforce be exact.     

硅烷热分解方法中温度对硅棒质量的影响

针对采用CVD反应器的硅烷热分解工艺制备棒状高纯多晶硅的过程进行了研究。理论上研究了硅烷受热分解的过程,以及温度梯度对硅沉积的影响。从应用角度出发,研究了制备过程中棒状多晶硅致密性、能耗、硅烷转化率等方面的影响因素。通过降低杂质和改善硅棒外观,使生产的多晶硅棒达到了区熔级的标准,并成功区熔成晶。提出了在制备工艺中尚待优化的问题,指出采用侧面间接进气方式有利于沉积的均匀性和致密性。     

The impact of the bird flu on public willingness to pay for the protection of migratory birds

In this paper, we present the results of a unique time series analysis of contingent values and models for migratory bird protection based on an identical contingent valuation (CV) survey carried out over a three year time period since the first bird flu outbreak in 2003. Although there exists no scientific evidence for a direct relationship, migratory birds are believed to play an important role in spreading the bird flu virus worldwide. The time series analysis allows us to test the temporal stability of stated preferences for migratory bird protection and at the same time examine indirectly the possible impact of increased media attention and public awareness levels regarding the bird flu. We test the impact of the bird flu on public willingness to pay (WTP) for migratory bird protection in the final 2005 survey whilst accounting for procedural variance introduced by sequencing and question ordering-effects, but we are unable to demonstrate a direct negative relationship. A novelty of the study presented here is that respondents in the CV surveys are given the opportunity to pay an annual money amount or a one-time-off lump-sum. Annual WTP values appear to be significantly higher than one-time-off WTP values, suggesting a negative implicit discount rate. Self-selection bias is an important reason for the observed differences. We find that respondents who agree to pay annually differ significantly from respondents who wish to pay a lump-sum in terms of their underlying preferences and motivations towards migratory bird protection.     

生产者延伸责任制度下废弃电器电子产品回收研究

文章从分析生产者延伸责任制度的由来和具体内容入手,对我国实际废弃电气电子产品的回收研究工作提出了相关建议。     

城镇化水平、FDI与房价——基于泛长三角的空间计量研究

文章利用31个城市2000-2011年面板数据,基于空间距离加权矩阵,使用空间计量相关方法,研究泛长三角地区城镇化水平、外商直接投资(FDI)与房价的关系。研究表明:空间相关性是影响房价的重要因素。城镇化进程加快导致了浙江、江苏和安徽房价上涨;实际FDI与房价的关系在省际间表现出明显差异,其中,浙江和安徽实际FDI与房价呈显著正相关,而江苏实际FDI与房价的正相关关系不显著。     

漂白活化剂TAED在棉针织物煮漂一浴中的应用研究

对漂白活化剂四乙酰乙二胺（TAED）在纯棉针织物的煮漂一浴前处理工艺中的应用情况进行了探讨。通过分析H₂O_{2用量、TAED用量、煮漂时间、煮漂温度等因素对织物白度的影响,以白度为参考指标,确定应用漂白活化剂TAED时的最优工艺条件。〖HJ5mm〗}     

Weak equilibria for time-inconsistent control: With applications to investment-withdrawal decisions

This paper considers time-inconsistent problems when control and stopping strategies are required to be made simultaneously (called stopping control problems by us). We first formulate the time-inconsistent stopping control problems under general multidimensional controlled diffusion model and propose a formal definition of their equilibria. We show that an admissible pair $(\widehat{u},C)$ of control-stopping policy is equilibrium if and only if the auxiliary function associated with it solves the extended HJB system, providing a methodology to verify or exclude equilibrium solutions. We provide several examples to illustrate applications to mathematical finance and control theory. For a problem whose reward function endogenously depends on the current wealth, the equilibrium is explicitly obtained. For another model with a nonexponential discount, we prove that any constant proportion strategy can not be equilibrium. We further show that general nonconstant equilibrium exists and is described by singular boundary value problems. This example shows that considering our combined problems is essentially different from investigating them separately. In the end, we also provide a two-dimensional example with a hyperbolic discount.     

The role of observed and unobserved heterogeneity in the duration of unemployment

This paper studies the degree to which observable and unobservable worker characteristics account for the variation in the aggregate duration of unemployment. I model the distribution of unobserved worker heterogeneity as time varying to capture the interaction of latent attributes with changes in labor-market conditions. Unobserved heterogeneity is the main explanation for the duration dependence of unemployment hazards. Both cyclical and low-frequency variations in the mean duration of unemployment are mainly driven by one subgroup: workers who, for unobserved reasons, stay unemployed for a long time. In contrast, changes in the composition of observable characteristics of workers have negligible effects.