禁酒妇女及其组织基督教妇女禁酒联合会(Woman’s Christian Temperance Union,WCTU)是19世纪美国改革年代及妇女运动蓬勃发展年代的产物。它承继前一个年代禁酒浪潮,将禁酒再一次推向高潮。然而,禁酒并不是她们惟一的活动和目标,其影...禁酒妇女及其组织基督教妇女禁酒联合会(Woman’s Christian Temperance Union,WCTU)是19世纪美国改革年代及妇女运动蓬勃发展年代的产物。它承继前一个年代禁酒浪潮,将禁酒再一次推向高潮。然而,禁酒并不是她们惟一的活动和目标,其影响也绝不仅仅局限于此,而是直指整个社会生活的方方面面。由此,它产生了广泛的社会影响。这种种影响都最终对妇女本身产生了不可磨灭的影响,对妇女运动的进展起到有力的推动作用。展开更多
A classical portfolio theory deals with finding the optimal proportion in which an agent invests a wealth in a risk-free asset and a probabilistic risky asset. Formulating and solving the problem depend on how the ris...A classical portfolio theory deals with finding the optimal proportion in which an agent invests a wealth in a risk-free asset and a probabilistic risky asset. Formulating and solving the problem depend on how the risk is represented and how, combined with the utility function defines a notion of expected utility. In this paper the risk is a fuzzy variable and the notion of expected utility is defined in the setting of Liu’s credibility theory. Thus, the portfolio choice problem is formulated as an optimization problem in which the objective function is a credibilistic expected utility. Different approximation calculation formulas for the optimal allocation of the credibilistic risky asset are proved. These formulas contain two types of parameters: Various credibilistic moments associated with fuzzy variables(expected value, variance, skewness and kurtosis) and the risk aversion, prudence and temperance indicators of the utility function.展开更多
根据中高轨道卫星热控涂层温度变化的周期性规律,提出了一种基于待定系数方法的热控涂层在轨性能变化估算方法,此方法仅利用温度数据,不需要卫星光照角、材料热容量等其他参数,降低了以温度反演热控涂层在轨性能变化的参数要求和计算难...根据中高轨道卫星热控涂层温度变化的周期性规律,提出了一种基于待定系数方法的热控涂层在轨性能变化估算方法,此方法仅利用温度数据,不需要卫星光照角、材料热容量等其他参数,降低了以温度反演热控涂层在轨性能变化的参数要求和计算难度。利用该方法,在参考了现有的卫星光学太阳反射镜(Optical Solar Reflector,OSR)太阳吸收比退化的在轨数据和地面试验数据的前提下,同时为计算数据的稳定性,文章估算了某卫星在轨运行580天至1670天约3年的时间里,卫星上OSR的太阳吸收比在轨性能变化情况,结果显示某卫星OSR在约3年的时间里,太阳吸收比仅增加了不到0.01,具有很好的稳定性。展开更多
文摘禁酒妇女及其组织基督教妇女禁酒联合会(Woman’s Christian Temperance Union,WCTU)是19世纪美国改革年代及妇女运动蓬勃发展年代的产物。它承继前一个年代禁酒浪潮,将禁酒再一次推向高潮。然而,禁酒并不是她们惟一的活动和目标,其影响也绝不仅仅局限于此,而是直指整个社会生活的方方面面。由此,它产生了广泛的社会影响。这种种影响都最终对妇女本身产生了不可磨灭的影响,对妇女运动的进展起到有力的推动作用。
文摘A classical portfolio theory deals with finding the optimal proportion in which an agent invests a wealth in a risk-free asset and a probabilistic risky asset. Formulating and solving the problem depend on how the risk is represented and how, combined with the utility function defines a notion of expected utility. In this paper the risk is a fuzzy variable and the notion of expected utility is defined in the setting of Liu’s credibility theory. Thus, the portfolio choice problem is formulated as an optimization problem in which the objective function is a credibilistic expected utility. Different approximation calculation formulas for the optimal allocation of the credibilistic risky asset are proved. These formulas contain two types of parameters: Various credibilistic moments associated with fuzzy variables(expected value, variance, skewness and kurtosis) and the risk aversion, prudence and temperance indicators of the utility function.
文摘根据中高轨道卫星热控涂层温度变化的周期性规律,提出了一种基于待定系数方法的热控涂层在轨性能变化估算方法,此方法仅利用温度数据,不需要卫星光照角、材料热容量等其他参数,降低了以温度反演热控涂层在轨性能变化的参数要求和计算难度。利用该方法,在参考了现有的卫星光学太阳反射镜(Optical Solar Reflector,OSR)太阳吸收比退化的在轨数据和地面试验数据的前提下,同时为计算数据的稳定性,文章估算了某卫星在轨运行580天至1670天约3年的时间里,卫星上OSR的太阳吸收比在轨性能变化情况,结果显示某卫星OSR在约3年的时间里,太阳吸收比仅增加了不到0.01,具有很好的稳定性。
