景区游憩价值评估的ZTCIA模型及其普陀山实证研究

景区游憩价值的评估可为景区可持续发展提供参考. 对游憩价值评估方法中旅行费用法的发展、存在问题和模型进行了阐述, 总结了国内外旅行费用法研究的不足之处, 并结合旅行费用法传统模型(ITCM和ZTCM)和旅行费用区间模型(TCIA)提出区域旅行费用区间分析(ZTCIA)模型. 为验证改进模型的实用性, 运用ZTCIA和ITCM模型评估了普陀山游憩价值, 2种模型的评估值分别为134.75亿元与135.95亿元, 从评估步骤上看, 2种模型存在一定的互补性, 因此, 最终将平均值135.35亿元作为普陀山2014年的游憩价值.     

Effects of charge compensation on red emission in CaYAl3OT7：Eu3＋ phosphor

Monovalent ions Li＋, Na＋, and K＋, as charge compensators, are introduced into CaYA1307： M （M = Eu3＋, Ce~＋） in this letter. Their crystal phases and photoluminescence properties of different alkali metal ions doped in CaYA1307 are investigated. In addition, the influence of charge compensation ion Li＋ which has a more obvious role in improving luminescence intensity on CaYA1307： Eu3＋ phosphor is intentionally discussed in detail and a possible mechanism of charge compensation is given. The enhancement of red emission centered at 618 nm belonging to Eu3＋ is achieved by adding alkali metal ion Li＋ under 393-nm excitation.     

Teleportation attack on the QSDC protocol with a random basis and order

The quantum secure direct communication （QSDC） protocol with a random basis and order is analysed and an effective attack, i.e. teleportation attack, is presented. An eavesdropper can obtain half of the transmitted secret bits with the help of this special attack. It is shown that quantum teleportation can be employed to weaken the role of the order-rearrangement encryption at least in a certain circumstance. Meanwhile, a possible improvement on this protocol is proposed, which makes it secure against this kind of attack.     

带有模糊参数的运输期望值模型

基于可信性理论,将提出一类带有模糊参数的运输期望值模型.然后,讨论模糊运输期望值模型的基本性质.最后,给出一个数值例子来表明所设计模型的实用性.     

学会质疑

假期中,我在做《寒假学习生活(八上)》(江苏人民出版社)36页第13题时,感觉题目有点问题.下面我将这道题抄在下面,细心的同学来看看有什么问题吧.某地举办乒乓球比赛的费用y(元)包括两部分:一部分是租用比赛场地等固定不变的费用b(元),另一部分费用与参加比赛的人数x人成正比例.当x=20时,y=1200;当x=     

酒企营销预算思路

近年来搭乘中国经济快速发展的红利,白酒行业得到迅猛发展。2011年全国规模以上白酒企业1169家;白酒类前10位上市企业2011年实现销售收入3746．7亿元,同比增长40．3％,利润增长51．9％。但是,随着我国经济转型的加快,白酒行业同质化、行业集中度低、竞争惨烈化加剧,特别是行业发展中广告与促销费用膨胀风险加速累积。1995年的央视“标王”孔府宴酒,其品牌“孔府宴”在2002年转让给山东联大集团;1996年的央视“标王”秦池,在业绩过山车之后一蹶不振;2008-2010年,洋河投入的广告促销费用分别为1．07亿元、1．43亿元和4．3ML元;2011年的央视招标会上,酒类企业共投放19亿元,超过招标总额的20％。     

CEV下考虑突发事件影响的有交易费用的交换期权定价

在股票价格满足CEV且受布朗运动和泊松过程共同驱动的模型下,对支付交易费用的交换期权定价进行研究,给出了期权价格满足的偏微分方程,并发现定价模型中股票价格的幂指数与波动率弹性α的选取有关,同时交易费用受泊松强度参数λ的影响,且随着λ的变大而变小.     

“运价”为负的运输模型计算机求解问题的处理

为解决一些计算机软件求解"运价"既有正值又有负值运输模型时"不可求解"的问题,本文采用"运价同额增减法"决策模型转换的方法,将原模型的"运价"全部转换为正值后再用计算机软件求解,并分别编写了EXCEL求解模板和求解程序对该方法的计算加以印证。结果表明,采用该方法求解得出的最优解(最优决策方案)与原模型求得的最优解完全一样,而最优值(最优决策效果)减去虚增(或加上虚减)的部分就是原模型的最优值。采用这种方法能成功地解决一些计算机软件"不可求解"的问题。     

Multiphase fluid dynamics and transport processes of low capillary number cavitating flows

To better understand the multiphase fluid dynamics and associated transport processes of cavitating flows at the capillary number of 0.74 and 0.54, and to validate the numerical results, a combined computational and experimental investigation of flows around a hydrofoil is studied based on flow visualizations and time-resolved interface movement. The computational model is based on a modified RNG k-ε model as turbulence closure, along with a vapor-liquid mass transfer model for treating the cavitation process. Overall, favorable agreement between the numerical and experimental results is observed. It is shown that the cavi- tation structure depends on the interaction of the water-vapor mixture and the vapor among the whole cavitation stage, the interface between the vapor and the two-phase mixture exhibits substantial unsteadiness. And, the adverse motion of the interface relates to pressure and velocity fluctuations inside the cavity. In particular, the velocity in the vapor region is lower than that in the two-phase region.     

A UNIFORM FIRST-ORDER METHOD FOR THE DISCRETE ORDINATE TRANSPORT EQUATION WITH INTERFACES IN X,Y-GEOMETRY

A uniformly first-order convergent numerical method for the discrete-ordinate transport equation in the rectangle geometry is proposed in this paper. Firstly we approximate the scattering coefficients and source terms by piecewise constants determined by their cell averages. Then for each cell, following the work of De Barros and Larsen [1, 19], the solution at the cell edge is approximated by its average along the edge. As a result, the solution of the system of equations for the cell edge averages in each cell can be obtained analytically. Finally, we piece together the numerical solution with the neighboring cells using the interface conditions. When there is no interface or boundary layer, this method is asymptotic-preserving, which implies that coarse meshes （meshes that do not resolve the mean free path） can be used to obtain good numerical approximations. Moreover, the uniform first-order convergence with respect to the mean free path is shown numerically and the rigorous proof is provided.