分布式地矿点源信息系统的构件化体系结构设计

应用数据集市技术、分布式构件技术以及Java技术,本文提出了一种以Internet为运行平台的新的分布式地矿点源信息系统设计方案。文中从数据库体系结构和应用系统的体系结构方面,探讨其构件化体系结构设计的原理与方法。实践结果表明,这种新的设计方案可以使该系统的新一代产品以更低的代价发挥更大的效益。     

绿色建筑采光模拟软件的适用性分析与计算精度验证

建筑采光模拟软件对绿色建筑设计有不可或缺的作用.文章首先阐述了建筑采光模拟软件的种类及特性,然后对4款采光软件的适用性进行分析,最后选取3款适用性较强的软件,通过实测与模拟对比的方法验证了软件的计算精度.     

Survival on the Titanic: Illustrating Wald and Lagrange Multiplier Tests for Proportions and Logits

Abstract: Students are interested in lecture examples and class exercises involving data connected to the maiden voyage and the sinking of the liner Titanic. Information on the passengers and their fate can be used to explore relationships between various tests for differences in survival rates between different groups of passengers. Among the concepts the authors examined are tests for differences of proportions using a normal distribution, a chi-square test for independence, a test for the equality of two logits, and a test for the significance of the coefficient of a binary variable in logit model. The authors examined the relationship between Wald and Lagrange Multiplier test statistics and give two related examples.     

政府监管对共享单车发展的影响——基于出行大数据的挖掘与分析

共享单车作为一种环保便捷的智能交通工具,由于过量投放、无序占道和运维错配等突出问题,严重影响公共秩序,政府监管势在必行。然而,政府严格监管对共享单车发展有何影响,一直在理论研究和社会实践中存在诸多争议。基于此,通过对成都中心区摩拜单车用户出行数据进行挖掘和分析,从政府、出行者和运营商视角,评估现行政府监管实施效果。研究表明,政府监管后,尽管出行意愿受到一定程度抑制,运维难度加大,但共享单车的公共属性得以强化,共享单车行业竞争格局得以调整,将有利于共享单车发展潜力的释放。     

“德合”船基于MOSES软件的DP作业分析

结合“德合”船DP动力定位系统,以康斯博格DP吊重测试文件为基础,基于MOSES软件对DP吊重测试过程中船舶关键数值进行模拟分析。建立了基于Moses软件的船舶模型及计算模型,对吊重过程中船舶吃水变化进行分析,选择典型吃水给到水动力模型中计算DP动力响应。从计算结果可以看出,随着吊机受力增加,船舶吃水逐渐增加,DP系统输出功率明显增加且对应关系明显。此计算结果为“德合”船DP测试安全进行提供数据支持,该计算模型也可以为以后海上DP吊装作业积累数据经验并提供参考。     

Compensating Wage Differentials with Unemployment: Evidence from China

We estimate the economic value of mortality risk in China using the compensating-wage-differential method. We find a positive and statistically significant correlation between wages and occupational fatality risk. The estimated effect is largest for unskilled workers. Unemployment reduces compensation for risk, which suggests that some of the assumptions under which compensating wage differentials can be interpreted as measures of workers’ preferences for risk and income are invalid when unemployment is high. Workers may be unwilling to quit high-risk jobs when alternative employment is difficult to obtain, violating the assumption of perfect mobility, or some workers (e.g., new migrants) may be poorly informed about between-job differences in risk, violating the assumption of perfect information. These factors suggest our estimates of the value per statistical life (VSL) in China, which range from approximately US$30,000 to US$100,000, may be biased downward. Alternative estimates adjust for heterogeneity of risk within industry by assuming that risk is concentrated among low-skill workers. These estimates, which are likely to be biased downward, range from US$7,000 to US$20,000.      

论旅游服务提供者在包价旅游合同中的法律地位及责任

针对旅游服务提供者的法律地位及责任问题,《关于审理旅游纠纷案件适用法律若干问题的规定》和《旅游法》都设置了若干规则,但其中某些规则值得商榷。在包价旅游合同中,旅游服务提供者并非旅游合同当事人,而是向债权人(旅游者)履行义务的第三人,也是《合同法》第121条中的第三人。旅游服务提供者是否属于旅游经营者的履行辅助人,在我国《合同法》对旅游合同中的违约责任不以过错为要件的背景下并不重要。旅游经营者无干涉、控制可能的公共交通运营者仍应属于旅游服务提供者。根据《合同法》第64条,旅游者对旅游服务提供者应享有履行合同义务或承担违约责任的直接请求权。因旅游服务提供者的原因而致旅游者人身损害或财产损失的,《旅游法》施行以后,旅游服务提供者与旅游经营者承担的是不真正连带责任。     

Performance of acquirers of divested assets: Evidence from the U.S. software industry

We provide a comparative analysis of acquirer returns in acquisitions of public firms, private firms, and divested assets. On the basis of a sample of 5,079 acquisitions by U.S. software industry companies during 1988–2008, we find that acquisitions of divested assets outperform acquisitions of privately held firms, which in turn outperform acquisitions of publicly held firms. While the higher returns for acquisitions of divested assets relative to stand‐alone acquisition targets can be explained by market efficiency arguments, seller distress and improved asset fit further enhance the positive returns of acquirers of divested assets consistent with the relative bargaining power explanation. Finally, we find that the effects of these buyer bargaining advantages are mutually strengthening and that they also hold for longer‐term acquirer performance Copyright © 2013 John Wiley & Sons, Ltd.     

基于天然气放空系统的水力计算软件开发

高压天然气放空系统由放空干线管段气体、放空管线及外界大气组成。放空管路属于非稳定流动,其水力计算不能采用一般站场管路的达西公式。以Fano方程为基础,运用流体力学及输气管路流动基础理论进行程序编写,计算软件可实现对各时刻放空所对应的瞬时放空量、累计放空时间、截面压力及温度、储气量的求解。计算结果与图解法进行对比,误差控制在2%以内,弥补了图解法仅可求得瞬时放空量而无法得到其他参数的缺陷,并利用东河伴生气管线下沉工程现场放空数据与本计算软件对比,计算结果吻合度高,符合现场工程实际。     

潜油电泵机组失效分析方法与软件

根据潜油电泵机组结构和工作状态,应用可靠性分析理论和方法,建立了无参数统计处理方法和有参数分布类型统计处理方法,并在PC机上开发了Epsras．exe软件,为潜油电泵机组失效分析提供了理论方法和计算软件。