卸荷裂隙在水利水电工程建设中的危害

卸荷裂隙是对水工建筑物稳定最不利的软弱结构面之一。文中较系统地介绍了这种结构面的特点、分布规律、形成的力学机理、对工程的危害、勘查方法及处理措施。     

水泥混凝土路面板破坏的原因及其防治

根据我国已建成通车的高等级公路的使用情况，从路基施工前准备、路基施工、台背处理、路面施工及路表面排水处理等方面较全面地分析了水泥混凝土路面破坏的原因及其防治。     

A network-based analysis of the impact of structural damage on urban accessibility following a disaster: the case of the seismically damaged Port Au Prince and Carrefour urban road networks

The magnitude 7.0 earthquake that struck Haiti in January 2010 led to an unprecedented effort in collecting and providing geographical information in support of humanitarian aid. Although most of the compiled datasets and generated maps were able to provide specific and detailed information regarding the location of damaged buildings and road interruptions, none or little information was available to describe the accessibility—or otherwise—of the urban space. Here we try to offer an alternative method to define the urban accessibility landscape in the aftermath of earthquake damage, by combining simple graph theory concepts and GIS-based spatial analysis to assess how the urban space accessibility decreases when the road network is damaged.     

How do Agricultural Programmes Alter Crop Production? Evidence from Ecuador

Evaluating agricultural programmes requires considering not only the programmes’ influence on input and output indicators, but also considering the relationship between these indicators as embodied in the production technology. This article examines the impact on production of an intervention in the Ecuadorian Sierra designed to improve returns to potato production through training and through linking smallholders to high‐value markets. Critical to identifying the impact of the programme is the careful construction of a counterfactual and meticulous data collection. To assess the impact of the programme on production, a weighted estimation, where weights are constructed through propensity score matching, is employed to estimate a production function within a damage abatement framework. The function incorporates a series of interaction terms to assess the impact of the programme on the production technology. The findings provide evidence that the programme enhances yields both through a general shift in technology as well as increased input use. The results suggest that the use of effective farming techniques that are learned through the programme induce this technological shift.     

汾河中下游“96.8”洪水灾害成因分析及防洪对策

１９９６年８月，汾河中下游发生了严重洪涝灾害，鉴于此次洪水范围广、历时长、洪灾严重等特点，为探求其致灾原因和存在的问题，同时也为今后整个流域的规划和治理提供一些依据。在１９９７年初，省水利厅以晋水发［１９９７］２６７号文件下达了研究任务。本文即是针对汾河中下游“９６．８”洪水的产生原因、致灾因素，以汾河干流为主，考虑主要产洪支流文峪河、潇河等，在对汾河水库到汾河入黄口进行全流域性实地调查研究的基础上，对该流域水利工程防洪效益进行分析，通过分析干流及区间洪水，计算出干流区间及主要支流径流系数，同时估算了干流各段河道行洪能力，对现有河道及堤防工程存在的问题提出了治理建议。     

The Impact of Omitting Promotion Variables on Simulation Experiments

Using store-level scanner data, elasticity matrices are estimated using a twotiered demand system. Two basic models are estimated, one with promotion variables and one without. Differences between the estimates across the two models are statistically significant. However, when the elasticities are used as 'inputs' into several simulation exercises, there are only small differences in merger effects and patent damage estimates.The results suggest that the differences are not 'economically' significant.     

Using Difference in Differences to Estimate Damages in Healthcare Antitrust: A Case Study of Marshfield Clinic

In calculating damages in healthcare antitrust cases, the difference-in-differences (DID) approach provides a potentially valuable means of controlling for lawful factors that influence prices, such as case mix and quality of care, as distinct from price differentials due to unlawful behavior. After comparing DID to traditional methods of estimating damages, this paper uses DID to analyze data from a well-known case against Marshfield Clinic, a large multi-specialty group practice that was found to have illegally allocated markets for physician services in Central Wisconsin. Using a specification similar to what was used in the case, we find that illegal behavior accounted for about one-half of the Clinic’s extra increase in costs per patient during the damage period. The courts, however, were not persuaded that the analysis adequately controlled for legal factors. We discuss potential pitfalls in using DID to estimate damages suggested by the case, as well as possible ways around them.     

贵州企业遭遇反倾销案例研究

从1996年起，中国已经连续11年成为世界反倾销头号目标国。贵州省虽然属于西南欠发达省份，但是同国内沿海经济发达地区一样，面临同样的国际市场和同样的反倾销的严峻形势。针对贵州出口涉外企业遭遇的反倾销调查情况进行研究，着重分析了参与应诉的企业和案件，并提出贵州企业应对国外反倾销的策略。     

太原市洪涝灾害与防洪工程整治

:本文介绍了太原市的大洪涝灾害、防洪现状和存在问题 ,提出了防洪整治措施     

应用DNA彗星电泳法检测辐照食品

通过彗星电泳法检测样品单细胞DNA损伤从而鉴别辐照食品。[方法]选取12种食品基质,经1KGy、3KGy、5KGy、7KGy、10KGy剂量辐照后,进行彗星电泳检测,并对检测时效性进行研究。[结果]除熟制鸡肉外,其他样品均可通过彗星电泳法检测到辐照状况,检测灵敏度达lKGy辐照剂量;辐照产生的DNA损伤具有明显的剂量-效应关系,以TL、TDNA％指标分析存在平台期,以TM、OTM指标分析则不存在平台期：辐照后6h-5d均可检测到明显的彗星图像。[结论]彗星电泳法适用于除熟制食品外的含DNA食品的辐照检测,方法稳定性好,检测灵敏度高。