变截面桩竖向承载性状的模型实验研究

利用自行研发的试验装置进行了半桩模型试验研究,分析了变截面桩的荷载-沉降曲线、桩身轴力分布情况、桩身侧摩阻力分布情况,并与常规等截面桩进行比较.模型试验结果表明：变截面桩较等截面桩更有利于减小桩体的沉降量,但从单桩沉降变形的角度看,变截面桩存在最佳变径比.当变径比超过这一最佳值时,变径比越大,桩的沉降变形也就越大,甚至超过等截面桩的沉降量.桩顶荷载首先并主要通过变截面处以上桩身传递,该部分桩身段是主要承载部位.由于变截面处下部土体对桩的支撑作用,变截面桩的桩身轴力在变截面处附近有较大程度的衰减.变截面桩的桩身侧摩阻力比常规等截面桩发挥更加充分.     

Antitrust, Marketing Cooperatives, and Market Power

Marketing cooperatives are common in agricultural markets. This article explores their price and welfare effects and relates to antitrust legislation in the United States, the European Union, and some of the EU member states-in particular, Sweden. Welfare is higher with a monopoly cooperative than with a profit-maximizing monopoly, if the scope for price discrimination is small and if the world-market price is low relative to the domestic price. As the world-market price rises (or as price discrimination becomes more important), the welfare effect is reversed. The price-discrimination effect suggests that, as a marketing cooperative integrates vertically, welfare may fall. These results carry over to a duopoly with a cooperative firm and a profit-maximizing firm. In such a duopoly, the cooperative behaves more aggressively and obtains a larger market share. Empirical evidence supports these conclusions.     

Is Investor Purchasing of Foreclosures Related to Neighborhood Crime? Evidence From a Phoenix Suburb

Little is known about how investors purchasing foreclosures during the recent U.S. housing crisis are affecting neighborhood crime. While they may decrease crime by reducing vacancies or bettering neighborhood conditions, they may increase it by escalating neighborhood turnover. Combining local police department data on calls for service with foreclosure, home sales, and sociodemographic data, this research uses longitudinal modeling to assess the relation between the purchasing of foreclosures by investors and calls for service in neighborhoods in Chandler, Arizona, a Phoenix suburb where investors are renting former foreclosures. Neighborhoods where foreclosures were more often purchased by investors had more calls for service about violent crime the following year.     

An evaluation of measurement uncertainty of trajectory angles using a 3D laser scanner

Measuring trajectory angles of bullet defects at a crime scene is an important part of crime scene investigation as these angles can be used for shooting incident reconstructions. The Washington State Patrol Crime Scene Response Team (WSP CSRT) had a desire to report and use measured trajectory angles. To report quantitative measurements, a statement of uncertainty for the measurement must also be reported due to an accreditation requirement through the ANSI National Accreditation Board (ANAB), through which the WSP CSRT is accredited. This evaluation examined the measurement uncertainty of the 3D laser scanning method that the WSP CSRT utilizes for measuring the vertical and azimuth angles from trajectory rods fitted to bullet defects. Three studies were performed which examined the variation of vertical and azimuth angle measurements from trajectory rods on flat surfaces, the variation of azimuth angle measurements from a trajectory rod on a curved surface, and a traceability study with known vertical and azimuth angle measurements. Seven common substrates were selected as target materials and were shot with 9 mm Luger and 0.45 Auto caliber bullets. A vehicle with one bullet defect was utilized for the curved surface study. The WSP's current fleet of Trimble X7 3D laser scanners, the WSP Criminal Investigation Division (CID) Detectives who operate these scanners, and the Forensic Scientists responsible for trajectory rod placement and angle measurements were utilized. An overall measurement uncertainty of +/− 2.6 degrees at an approximate 95% confidence interval was determined for all trajectory angles measured from trajectory rods.     

“垂直领导”:法院体制改革的重大误区

本文认为 ,当前法院体制改革中 ,主张将人、财、物权划归最高人民法院统管 ,即在法院系统内部实行“垂直领导”的观点是值得商榷的。并从制度层面、理论观念和传统意识的角度 ,对这种观点的问题和形成原因进行了深入分析和论证     

Regulation and Third-Party Discrimination in the German Electricity Supply Industry

Despite the monopolistic networks, the liberalized electricity supply industry in Germany is unregulated; the network-access charges are only subject to competition law, not to ex-ante approval. This paper explores the consequences of this policy by analyzing empirical observation with the theory of vertical relations. It concludes that the authorities' focus should be on the level of the access charges and not on discriminatory behavior. Unregulated access charges imply that the integrated firms have different incentives as compared to the independent entrants with respect to the competitive markets. Thereby, the principle of a level playing field is violated.     

我国行政监察制度存在的主要问题与改革建议

行政监察作为行政机关内部的一种自律性监督,是行政管理运行机制中不可缺少的组成部分.随着我国社会政治经济的发展,腐败事件层出不穷,行政监察在腐败事件面前显得虚弱无力.现阶段如何健全与完善行政监察制度,成为我们面临的一个重要课题.根据中外历史经验和我国实际情况,应将行政监察机关从目前的行政系统中划出来单独设置,实行垂直领导,并进一步强化和扩大行政监察机关职权,建设高素质的行政监察队伍,完善行政监察法律法规体系.     

Family Shelter Entry and Re-entry During the Recession in Hennepin County: The Role of Race,Residential Location,and Family Earnings

This article examines the extent to which shelter entry and re-entry increased during the Great Recession (December 2007–December 2009) in Hennepin County, Minnesota. Among successive cohorts of families entering the Supplemental Nutritional Assistance Program (SNAP), Black families were 23% more likely to enter shelter if they were in the 2008–2009 cohort and 28% more likely to enter shelter if they were in the 2010 cohort than if they entered SNAP in 2004–2005. In addition, families who left shelter in 2009 were 39% more likely and families leaving shelter in 2010 were 63% more likely to re-enter shelter than those leaving shelter in 2004–2006. Only a small part of the increases in shelter entry and shelter re-entry was explained by reductions in family earnings. This suggests that the increases in shelter entry and re-entry may have been caused by other factors, such as the decline in the availability of affordable housing.     

Spotlight on the Main Actors: How Land Banks and Community Development Corporations Stabilize and Revitalize Cleveland Neighborhoods in the Aftermath of the Foreclosure Crisis

Cleveland, Ohio provides a useful case for examining and contrasting property transfer practices among certain key actors before, during, and after the foreclosure crisis. Transfers among key actors—Cleveland’s two land banks, the State of Ohio, Fannie Mae, investors, and community development corporations (CDCs)—differed considerably. This article empirically shows that inappropriate property transfer practices by financial institutions and speculator-type investors negatively impacted neighborhoods, compounding the damage brought on by the foreclosure crisis. By contrast, a case study of one of the hardest hit neighborhoods in Cleveland finds that the land banks and CDC are producing positive outcomes. A proactive land bank as a conduit and robust CDCs as a project promoter are an effective combination to cope with vacant and abandoned properties.     

The use of economic analysis by the Supreme Court in applying the concept of the relevant market

Attention by the courts to what constitutes a market has resulted from litigation enforcement by both the Federal Trade Commission and the Antitrust Division of the Department of Justice, especially in connection with the amended section 7 of the Clayton Act. The termmarket is not mentioned in either the Clayton or the Sherman Acts. What constitutes a part of commerce, a line of commerce, or section of the country has been interpreted by the courts to mean a market. A market in antitrust administration then becomes judicial—a process of interpreting the language of the antitrust statutes.