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If menstruation is periodic irregular, next time menstrual date is bad to calculate, but rough and computative the 15th day after this second menstruation is oviposit period.

假如月经周期不规则，下次月经的日期不好计算，可粗略推算本次月经后的第15天为排卵期。

The Mean-CVaR (Conditional Value-at-Risk) portfolio optimization model is proposed to calculate a globally optimal portfolio under concave transaction costs. A non-decreasing concave function is employed to approximate origin transaction costs function.

研究了当投资组合的风险用条件风险价值（Conditional Value at Risk，简称CVaR）度量，考虑凹交易费用的投资组合选择问题，通过对交易费用采用非线性的凹函数，建立了一个均值-CVaR模型。

To exert the economy of scale of project of maintenace and to reduce the unit cost of maintenace,this paper discusses how to orient the set dot of concrete mixer and how to calculate the economic radius in the maintenance of expressway.

以养护工程的经济性为研究出发点，以单位工程养护成本为衡量指标，提出了在高速公路养护施工中，拌和站设置点的选择和养护经济半径的确

Our method can also be used to calculate the "concurrence"proposed by Wootters et al.

应当指出，我们的这一方法还可直接用来计算Wotters等人提出的'concurrence'。

Based on the condensability of liquid,the structure used in multi-axis force sensor of underwater robot aimed at balancing hydraulic pressure was investigated and an iteration algorithm used to calculate the pressure difference between in and out of the sensor was put forward,which applied the pressure balance method of film .

以水下机器人所用多轴力传感器的压力平衡结构为研究对象，基于液体的可压缩性，提出了膜片式压力平衡传感器内外压力差的迭代算法，推导出了膜片式压力平衡法的内外压力差、额外轴向力及相关公式。

The computer integration is used to calculate the condensed steam exothermiccoefficient of the condensator in automobile air-conditioners with SHAHformula, which is more simple and accurate than the traditional phase-changecriterion method.

采用Shah公式，用电子计算机积分法，计算汽车空调冷凝器制冷蒸汽冷凝放热系数。比传统相变准数法，更为简单、准确

This paper uses mixture density networks to forecast the time-varying conditional density values of financial time series, and puts forth a new numerical algorithm to calculate Expected Shortfall. The application in Hong Kong Hangseng index approves that Value-at-Risk at high probability levels is accurate, and that it also has good forecasting ability in fluctuation. MDNs can effectively describe the empirical distribution of returns and the volatility mechanism, and is a new model for measuring financial market risk.

基于混合密度网络模型估计金融时间序列的时变条件密度，提出采用数值模拟方法计算Expected Shortfall的新途径，对香港恒生指数的实证研究表明，VaR的预测精度在高端分位点较好，模型评估指标反映出预测效果良好，混合密度网络可以有效地描述收益的经验分布统计特征和波动规律，是一种有效的金融市场风险测量模型。

In this paper,we use the historical data to get the experiential distribution function of conditional revenue ratio when we can not determine the type of the allied distribution of the price and revenue ratio,and then we calculate the VaR under a certain price level of the price.

1研究意义VaR是目前证券投资风险管理的重要工具，在数学上，表示为投资组合收益率分布的下α分位数，表达式为：P=α(VaR 0)图1 VaR的图形表示其中，ΔP表示在Δt时间内，某个金融资产的市场价值的变化，α为给定的概率，如图1所示。

An operating risk assessment algorithm for hidden failures was developed, which could calculate the conditional probability using event tree method and evaluate the severity of hidden failures.

采用事件树方法分析计算继电保护隐患的暴发概率，选取严重性指标度量继电保护隐患暴发的后果，用风险作为指标定量评估继电保护隐患对电网安全的影响。

That means to calculate the Hessian matrix of optical flow equation, and the weight of Lucas-Kanade＇s method is defined as the reciprocal of the conditioning number of its Hessian matrix.

然后借用灰度直方图的概念构造方向直方图，提取光流特征，方向直方图由量化光流场来得到，再利用方向直方图构造出一个模板库及其索引序列库。

This Low Cost Desexing Scheme provides an affordable means to sterilize stray cats to control their number, reduce their misery and protect them from human cruelty arising from overpopulation.

这个计划为流浪猫提供了一个可以负担得来的绝育途径，以控制它们几何级数的繁殖，减少它们因为数目太多造成的苦难和引来人类残酷的对待。

Can you make head or tail of the letter?

你看得懂这封信封吗？