10kV城市电网接地方式探讨

分析了目前１０ ｋＶ城市电网接地系统存在的问题,提出了两种改善１０ ｋＶ电网运行状况的方法,并简要说明了各自的优缺点。     

The right to adequate housing: evictions of the homeless and the elderly caused by the 2020 Summer Olympics in Tokyo

Abstract

The reconstruction of the National Stadium for the 2020 Summer Olympics and Paralympics in Tokyo has induced displacement of two groups of vulnerable people, raising concerns of the violation of human rights, particularly the right to adequate housing. The expansion of the stadium led to the expulsion of dozens of homeless people who lived in and around the park surrounding the stadium, and a sudden decision to demolish a nearby public housing estate built for the 1964 Summer Games forced over 200 tenants, most of whom were elderly, to be relocated. While the homeless people engaged in several rounds of negotiation with the government authorities, the majority of the housing tenants reluctantly agreed to move except for a few who kept demanding respectful treatment from the metropolitan government. Presenting the preliminary results of a mixed-method three-year qualitative study, this research note demonstrates that while the authority might have offered alternative housing considered ‘adequate’ in terms of physical living conditions, the process of evictions did not afford autonomy for the affected to choose where to live. The respective status of the affected – homeless and elderly – may demand the reconsideration of the concept of ‘adequate housing’ in relation to human dignity.     

Reversal of fortune? The long-term effect of conservation-led displacement in Nepal

Building on a panel data-set using two rounds of self-administered surveys, this study assesses the long-term welfare effects of conservation-led displacement in Nepal. Empirical findings indicate that while displaced households suffered from poor land productivity and food insecurity in the first five years after displacement, they appear to be better off today, a decade since displacement, compared to non-displaced households. However, this has come at the expense of loosening social ties, increased strain on human capital and, most importantly, an overall deterioration in people’s socio-cultural wellbeing.     

Discrimination is a Societal Issue Too: Moving Beyond Individual Behavior

Crowding in natural settings such as nature reserves may lead to both long-and short-term spatial and temporal behavioral adjustments. This study analyzes the short-term coping process as a function of the crowding disturbance in two popular nature reserves in Israel. Using binary and multinomial choice models, a direct robust connection between the crowding disturbance and a hierarchical set of behavioral responses was found. People less sensitive to crowding tried to avoid or reduce the length of the contact by changing pace. More sensitive visitors may change route. Finally, visitors most sensitive to crowding may terminate their visit altogether.     

The Pricing of Dividends in Equity Valuation

Abstract:   This study uses Ohlson's (1995 and 2001 ) accounting‐based equity valuation model to structure tests of four explanations for the anomalously positive pricing of dividends reported by Rees (1997) and Fama and French (1998) . First, we find that dividends are not simply a proxy for publicly available information that helps predict future abnormal earnings. Second, although dividends act as if they signal managers' private information about future profitability, they remain positively priced for firms with low incentives to signal. Third, dividends do not signal management's willingness to abstain from incurring agency costs. Fourth, however, controlling for one‐year‐ahead realized forecast errors yields a pricing of dividends that is very close to that of dividend displacement. After showing that dividends are not simply a proxy for analysts' misforecasting, we conclude that dividends appear to be positively priced because they are a proxy for the mispricing by investors of current earnings or book equity.     

岩溶沉陷区埋地管道预警与极限位移响应分析

针对岩溶地区地表沉降导致管道逐渐失效破坏的严重问题,采用有限元分析软件,对不同内压下在不同沉降长度时管道所达到极限位移状态下进行力学响应分析,并分析了在不同内压下管道的极限悬空长度,得到了不同条件下管道极限位移和极限悬空长度及不同沉降长度下的管道预警位移,为管道安全预警及安全评价提供依据.结果表明:随着沉陷长度的增加,管道跨中应力不断减小,两端应力逐渐增大,管道危险位置由跨中逐渐向两端转移;随着内压的增加,管道危险位置出现在两端时的沉陷长度越短;且内压越大管道最大位移和预警越大,管道极限悬空长度越短.     

矢跨比对大跨度格构式拱屋盖结构性能的影响

以大跨度格构式拱屋盖结构为研究对象,运用3D3S软件设计建模,对矢跨比为0.15、0.2、0.25、0.3、0.35的模型进行受力分析,取其第六榀结构数据进行结果分析,得到内力位移图。通过分析,指出了该结构的薄弱部位,并提出了在结构设计时选用矢跨比为0.2-0.3之间最佳,为格构式拱结构稳定性设计提供参考价值。     

天然气长输管道氮气隔离法投产置换工艺研究

以长庆气田至呼和浩特天然气管道建设工程为背景，探讨了氮气隔离法置换工艺在天然气长输管道投产中的应用。通过对采用单隔离器和无隔离器的两种天然气置换工艺进行分析比较，得出了无隔离器的氮气隔离置换工艺是目前比较理想的天然气置换工艺。     

提高油田固井质量的施工措施探析

固井工程是一项应用工程,是建井过程中的重要环节,它直接影响钻井周期和建井成本,以及油田开发方案的实施。深井、超深井的井下地质条件非常复杂,对固井质量有许多不利的因素,在井下条件确定的情况下,决定性的因素是环空流动的壁面剪应力,它是影响顶替效率的主要因素。