关于单位分数的一个猜想

若1/x_1+1/x_2+…+1/x_k,0相似文献   

空间的凸性和远达点映射的连续性

本文给出空间严格凸、CLUB和LUR的新特征刻划,后用这些特征对中一定理作了改进.     

Working Mothers' Choice between Parental Leave and Job Continuity A Paradox in South Korea

This study investigate whether the positive relationship between the use of parental leave and job continuity of mothers exists in Korea. using a secondary dataset composed of 1,000 mothers who have already utilized maternity leave, the article finds that the relationship between the use of parental leave and job continuity of mothers is negative. To enable working mothers to reconcile paid work and family responsibility in Korea, it is therefore necessary to construct a more comprehensive policy package, including expansion of the publicly supported childcare system, the reformation of childcare responsibility between genders, and public payments for childcare provided by families.     

Bootstrap versus traditional hypothesis testing procedures for coefficients in least absolute value regression

Several approaches to hypothesis testing for coefficients in least absolute value regression are compared using a Monte Carlo simulation: likelihood ratio test, Lagrange multiplier test, and three versions of the bootstrap hypothesis test. Factors considered that might influence test performance include the disturbance distribution, the type of independent variable, and the sample size. Overall, the likelihood ratio and the bootstrap tests perform best, with the likelihood ratio test being marginally more powerful. Least absolute value tests are also compared to the standard t test and three versions of the bootstrapped t test for least squares regression.     

What affects happiness: Absolute income,relative income or expected income?

This study probes the reasons why increased income does not enhance happiness based on the effects of relative income and expected income. The study analysis is based on results from the Taiwan Social Change Survey from 1999 to 2002, using an ordered probit model. The findings demonstrate that the Taiwanese people are happier with an increase in absolute income. However, the marginal effect is reducing. In addition, relative income and expected income meet the expectation, indicating that people's happiness is not only related to absolute income, but also closely associated with the average income found in society and expected income.     

2n阶J-自伴算子的谱是离散的充分条件

借助Naimark关于2n阶对称微分算式所生成最小算子L0之任何自伴扩张Lu的谱是离散的充分条件定理,利用Lidskii方法,得到了2n阶J-自伴微分算子的谱是离散的另一个充分条件.     

民初云南绅耆的社会地位与角色

民国建立，云南绅耆不仅没有边缘化，地位反而越居显要，无论在政坛还是地方社会中都充当重要角色，活动甚形活跃，绅耆通过重新分化组合，趋时应变，变化身份，保持了既往的权势地位，这一历史现象在一定程度上说明辛亥革命虽完成了政治上的鼎革，社会鼎革似未出现，历史的延续性仍然很明显。     

Everyday Life Mobilities of Older Persons – A Case Study of Ageing in a Suburban Landscape in Sweden

Abstract

This paper describes the changing everyday life mobility of an older couple living in a suburb in Sweden. The methods used are longitudinal interviews and time-geographical diaries. The results show a pronounced dependence on car use. Representations of suburbia – as places of freedom, independence and mobility enabled by private cars – devolve into a harsh reality, i.e. disabling lock-in effects for people gradually losing locomotion, and experiencing diminishing mobility capital and social intercourse. From a time-geographical perspective, capability constraints unfold in the form of time-demanding basic needs and limited access to different modes of transport due to deteriorating health and location of residence. Increased neighbourhood barriers and authority constraints also imply restricted access to different spaces and reduced control over one’s life situation.     

Intergenerational Continuity and Change in Conceptualization of the “Child” Among Guji People of Ethiopia

The rapidly growing globalization that embodies new technologies has greatly characterized intergenerational difference by fostering change and hindering continuity of values and traditions. However, the effects of cultural change on intergenerational continuity and change in less technologically developed societies have not been documented adequately. This article presents change and continuity between adults and children in conceptualization of the “child” in the context of the Guji people of Ethiopia. It discusses how the meaning of “child” is variable across synchronic generations among the Guji people and how this variability reflects discontinuities and continuities in intergenerational transmission of local knowledge. The difference between adults and children in their knowledge of generational structure is observed as a ground for their divergence in conceptualization of the “child.” Accordingly, for adults, one’s position in generational structure is a basis for identifying somebody as a child. However, for children, one’s level of physical maturity is a basis for defining somebody as a child. The data on which this article is based are drawn from 10 months of ethnographic fieldwork among the Guji people.     

论外交保护的国籍持续要求及其例外规则

外交保护是国家保护海外国民最重要的法律手段之一。国家实施外交保护的首要前提是国籍持续,即个人或公司从发生损害之日到求偿提出之日持续地具有保护国国籍。如果在上述两个时间点上个人或公司都具有保护国国籍,那么可以推定这期间的国籍状态是持续不断的。在满足一定条件后,国籍持续可以存在例外,其中"国家继承"和"公司因损害而终止存在"是较为特殊的情况。但就个人而言,国籍变更后,现国籍国不得针对原国籍国就该受害者所受到的损害实施外交保护,除非原国籍国放弃反对的权利。中国的政府声明没有明确涉及该问题。因此,我国有必要在该领域进一步完善自身的法律规范与外交政策。