高阶中立型时滞微分方程的渐近性与振动性

得到了变系数高阶中立型时滞微分方程d^n/d^tn[x(t) p(t)x(t-τ)] ∑i=1^mQi(t)(t-бi)=0的渐近性和n为偶数时解振动的充分性判据。改进和推广了文献^[1-4]中的结果。     

延期支付条件下的最优付款时间确定：考虑现金折扣情形

现有延期支付条件下零售商最优付款时间的研究文献均假设,零售商付款时间可以在延期支付期限时点或补货周期之内任一时点,但这一关键假设却并不符合商业惯例,也没有考虑实践中卖方广泛使用现金折扣以刺激买方提前还款的情形。为此,通过对已有模型进行了修正和补充后,给出了零售商在供应商给定延期付款、现金折扣政策下最优付款时间的判定方法。     

LFMCW雷达信号多周期模糊函数分析

给出了LFMCW雷达信号的多周期模糊函数,并与单周期信号进行了比较。讨论了在单周期和多周期的模糊函数联系,沿主轴切割模糊函数的性质和体积有限方面上两者特征的差别。仿真结果表明,增大周期可提高多普勒分辩力,但不能改善时延分辩力。     

中国早期现代化进程延误的原因探析

近代史上中国的早期现代化进程一误再误,其原因是多方面的,有中国内在的原因中国传统文化的束缚、传统政治经济结构的制约、"文化自我中心主义"心态的阻抗、现代化主导者保守性决策的阻滞等,也有外来的影响即西方资本主义渗透和帝国主义侵略的羁绊.我们不能只强调其中的内在因素也不能片面夸大外来的影响,正确认识这一问题,旨在进一步解放思想、深化改革、扩大开放,为当前正在进行的中国社会主义现代化建设提供认识根据.     

一类时滞微分方程的全局吸引性

考虑时滞微分方程 :dN(t)dt =r(t)N(t) [1 -N( g(t) )k ]α,t≥ 0 .其中α≥ 1是两个正奇数之比 ,获得了保证其每一正解趋于正平衡点的一族充分条件     

Economic Evaluation of Systems that Expedite Inventory Information

Information delays exist when the most recent inventory information available to the Inventory Manager (IM) is dated. Such situations arise when it takes a while to process the demand data, count the inventory, and pass the results to the IM. We show that the optimal total inventory‐related cost decreases when the length of the information delay decreases. The amount of the decrease is an important datum for an IM interested in considering whether or not to invest in reducing the delay. The investment is required to finance design and acquisition of an information (collection and dissemination) system that can reduce the information delay. Such systems include phone calls, business meetings, and the use of information collection mechanisms such as radiofrequency identification tags.     

论航空旅客的精神损害赔偿

航空旅客在空难中死亡、伤残、惊吓、行李毁损或遗失、航班延误、超售和拒载等情形下都可能遭受精神损害,由此引发了不同类型的精神损害赔偿。航空旅客精神损害赔偿是否应有限额,立法与司法存在差异;航空旅客精神损害事实、因果关系、赔偿数额以及法律适用的判定等均与法官自由裁量权密切相关。     

金融危机预警指标体系及其结构方程模型构建

金融危机预警指标体系的构建是研究金融危机预警的一个重要环节。对于一个国家或者地区,不同部门之间资金流动的大小和方向反映了金融风险的大小。本研究在建立了金融危机预警指标体系的构建原则后,从数据的统计口径出发,基于资金流动的大小和方向,统筹考虑政府、金融、企业和对外等四个部门之间的关联性,利用结构方程模型,构造了金融危机预警指标体系。最后,通过自回归模型进行指标时滞性分析。     

Influencing support of charitable objectives in the near and distant future: delay discounting and the moderating influence of construal level

Two studies investigated the delay discounting effect in charitable giving situations, and whether construal level moderates this effect. In both studies, construal level was manipulated by inducing a concrete vs. an abstract mindset. Participants were asked how much time (Experiment 1) or how much money (Experiment 2) they would be willing to volunteer or donate, respectively, to a self-chosen charitable organization in either the near or distant future. Participants committed themselves to contributing more time and money in the distant than in the near future. Additionally, an abstract (vs. concrete) mindset reduced this delay discounting effect, particularly for monetary donations. Delay discounting of costs associated with altruistic behavior and the role of construal level in increasing donations and volunteering are discussed.     

Delay and Anxiety in Care Proceedings: Grounds for Hope?

This paper draws on an evaluation of a pilot project in three London boroughs (the ‘Tri-borough’ authorities) which had the aim of reducing the length of care proceedings to 26 weeks, in advance of nationwide moves in the same direction. Rather than looking at this as yet another battleground between professional autonomy and bureaucratic rigidity, the authors focus on the psychological aspects both of court delay itself and of setting time limits, considering the impact of each on the children, parents and professionals involved. The challenge is to balance the pressures of time and the need for thoroughness, being mindful of the uncertainty and anxiety that pervade care proceedings. The pilot succeeded in greatly reducing the average length of care proceedings. Professionals involved in the project, including those whose job was to represent the interests of parents and children, seemed satisfied that this had not been achieved at the expense of thoroughness, and indeed that shorter proceedings might help to reduce the overall level of distress and anxiety that children and parents endure. On the other hand, the new approach adds to the pressures on the professionals themselves. If the changes are to be sustained, the anxiety involved in making these life-changing decisions about children must be recognised, and adequate support offered to those who have to make them.