挖泥船挖深能力计算的理论探讨

针对挖泥船"挖深"提出的计算方法不仅考虑到泥泵的吸上性能NPSHr和所挖泥沙的浓度Cv,而且考虑了泥沙的颗粒组成及分布,对所能挖取泥沙或砾石的颗粒大小进行了核算,兼顾了"浓度"和"粒径"的因素,从而对"挖深"提出一种更合理的计算方法。     

新时期水电功能转换初探

随着我国经济的快速发展,智能电网将在未来经济建设和社会发展中发挥举足轻重的作用。我国智能电网的实现和应用呼唤更为科学、高效、合理的电力调节。文章创造性地运用新政下的装机容量计算公式对水电功能转换进行深入分析与综合研究,指出了水电行业在新时期下将发挥至关重要的作用。     

Cost-effectiveness of partially-hydrolyzed formula for prevention of atopic dermatitis in Australia

Abstract

Objective:

To perform an economic evaluation of a specific brand of partially hydrolyzed infant formula (PHF-W) in the prevention of atopic dermatitis (AD) among Australian infants.

Methods:

A cost-effectiveness analysis was undertaken from the perspectives of the Department of Health and Aging (DHA), of the family of the affected subject and of society as a whole in Australia, based on a decision-analytic model following a hypothetical representative cohort of Australian newborns who are not exclusively breastfed and who have a familial history of allergic disease (i.e., are deemed ‘at risk’). Costs, consequences, and incremental cost-effectiveness ratios (ICER) were calculated for PHF-W vs standard cow’s milk based infant formula (SF), and, in a secondary analysis, vs extensively hydrolyzed infant formula (EHF-Whey), when the latter was used for the prevention of AD.

Results:

From a representative starting cohort of 87,724 ‘at risk’ newborns in Australia in 2009, the expected ICERs for PHF-W vs SF were AU$496 from the perspective of the DHA and savings of AUD1739 and AU$1243 from the family and societal perspectives, respectively. When compared to EHF-Whey, PHF-W was associated with savings for the cohort of AU$5,183,474 and AU$6,736,513 from the DHA and societal perspectives.

Limitations:

The generalizability and transferability of results to other settings, populations, or brands of infant formula should be made with caution. Whenever possible, a conservative approach directing bias against PHF-W rather than its comparators was applied in the base case analysis. Assumptions were verified in one-way and probabilistic sensitivity analyses, which confirmed the robustness of the model.

Conclusions:

PHF-W appears to be cost-effective when compared to SF from the DHA perspective, dominant over SF from the other perspectives, and dominant over EHF-Whey from all perspectives, in the prevention of AD in ‘at risk’ infants not exclusively breastfed, in Australia.     

The density of the time to ruin for a Sparre Andersen process with Erlang arrivals and exponential claims

We derive expressions for the density of the time to ruin given that ruin occurs in a Sparre Andersen model in which individual claim amounts are exponentially distributed and inter-arrival times are distributed as Erlang(n,?β). We provide numerical illustrations of finite time ruin probabilities, as well as illustrating features of the density functions.     

我国高等教育财政绩效拨款模式改革的思考

高等教育规模扩大和政府财政支出下降的矛盾日益突出,出于对高等教育机构效率低下问题的日益关注,世界各国出现了调整高等教育财政拨款方式的趋势。我国进入高等教育大众化发展阶段后,也出现了上述问题。针对目前我国高等教育面临需求压力巨大、规模迅速扩张、质量问题凸现、投入不足等诸多矛盾,我国高等教育财政拨款模式改革的目标应定位为：借鉴国外有益经验,努力提高高教财政拨款与管理的科学性、公开性、公平性,强调高教资金分配的竞争}生、择优性及效益。（一）拨款机制改革：构建“政府一中介一学校”三方协调运作机制模式;（二）拨款方法由单一的“综合定额加专项补助”模式改为“公式加合同”复合模式。     

基于实验与数学的匀速圆周运动向心力公式推导方法

本文运用观察实验和数学方法,给出了匀速圆周运动向心力公式的几种推导方法,以促进人们更加深刻地认识、理解和应用匀速圆周运动向心力。     

任意空间位置两多边形多匝线圈的互感计算

根据聂以曼公式推导出任意空间位置两多边形线圈互感的一般表达式,应用旋转矩阵实现了线圈位置的变化,通过MATLAB软件编程计算,绘出了互感的变化曲线,并对计算结果进行进行了分析验证。     

草甘膦铵盐原药的合成及可溶性粒剂的制备

在水介质中,采用草甘膦酸与氨水为原料直接制备得到草甘膦铵盐原药,并且反应母液可以循环套用,工艺简单,无生产废水,便于操作,产品质量稳定,是一条易于工业化的工艺路线,可制成可溶性颗粒剂。     

A Closed Form Formula for Valuing Mortgages

We develop a closed form formula for the value of a fixed-rate residential mortgage that includes the provision that the borrower can prepay at any time with no penalty. The value of the mortgage equals the expectation, under the risk neutral probability measure, of the future cash flows. We model future cash flows by estimating an empirical model of prepayment behavior. A second change of measure leads to a closed form expression for the expectation. The closed form values explain most of the time series variation in MBS prices. The closed form formula significantly shortens the time to calculate mortgage values and durations and can be a useful tool for portfolio management and hedging.     

实物期权在投资决策中的运用

本文通过引入实物期权的思想为投资决策评价,运用布莱克—舒尔斯和二叉树期权定价模型,给战略投资隐含的实物期权定价,使用蒙特卡罗方法来消除关键因素的不确定带来的影响。