Does institutional quality resolve the Lucas Paradox?

The Lucas Paradox observes that capital flows predominantly to relatively rich countries, contradicting the neoclassical prediction that it should flow to poorer capital-scarce countries. In an influential study, Alfaro, Kalemli-Ozcan, and Volosovych (AKV) argue that cross-country variation in institutional quality can fully explain the Paradox, contending that if institutional quality is included in regression models explaining international capital inflows, a country’s level of economic development is no longer statistically significant. We replicate AKV’s results using their cross-sectional IFS capital flow data. Motivated by the importance of conducting inference in statistically adequate models, we focus on misspecification testing of alternative functional forms of their empirical model of capital flows. We show that their resolution of the Paradox relies on inference in a misspecified model. In models that do not fail basic misspecification tests, even though institutional quality is a significant determinant of capital inflows, a country’s level of economic development also remains a significant predictor. The same conclusions are reached using an extended dataset covering more recent IFS international capital flow data, first-differenced capital stock data and additional controls.     

凿井水下底卸式自动卸料吊桶

吊桶是立井井筒开凿时期提升矸石和运送材料及升降人员的主要容器,吊桶的卸矸目前多采用挂钩式或座钩式卸料方式;但是随着矿井的开凿深度不断延伸,在过透水层时,由于探放水不及时或涌出水比较大,超出了井筒的排水量,或者是由于冷冻井在解冻后,井筒的井筒质量不过关,各别井壁也会发生透水事故;这就会出现淹井事故,有时淹井深度达二三百米。对于处理这种淹井事故,往往只有一个办法,那就是用沙或混凝土对井筒回填;这就需要吊桶在下到几百米下的水底自动把料卸掉,但现在矿井常用的挂钩式吊桶和座钩式吊桶已经不能满足这个需要了。     

检测机构仪器设备档案管理初探

阐述了检测机构如何根据《实验室资质认定评审准则》要求,确定仪器设备档案的归档范围、归档内容,并通过建立实验室管理系统使仪器设备档案管理实现数字化、网络化,还对仪器设备档案的归档流程等内容进行了探讨。     

一种多功能液压试验台控制系统设计

本文介绍了一种多功能液压试验台控制系统设计,液压控制模块的设计采用了模块化设计方式,可以缩短产品设计开发周期减少开发成本。液压系统采用LUDV负载反馈控制技术能实现对不同负载压力的多个执行元件同时系统流量自动按比例分配。     

Extreme Value Theory and Statistics of Univariate Extremes: A Review

Statistical issues arising in modelling univariate extremes of a random sample have been successfully used in the most diverse fields, such as biometrics, finance, insurance and risk theory. Statistics of univariate extremes (SUE), the subject to be dealt with in this review paper, has recently faced a huge development, partially because rare events can have catastrophic consequences for human activities, through their impact on the natural and constructed environments. In the last decades, there has been a shift from the area of parametric SUE, based on probabilistic asymptotic results in extreme value theory, towards semi‐parametric approaches. After a brief reference to Gumbel's block methodology and more recent improvements in the parametric framework, we present an overview of the developments on the estimation of parameters of extreme events and on the testing of extreme value conditions under a semi‐parametric framework. We further discuss a few challenging topics in the area of SUE. © 2014 The Authors. International Statistical Review © 2014 International Statistical Institute     

有效提升粮油检测数据的准确度

本文主要探讨粮油检测数据的科学性和准确性,包括粮油样品的扦取、检测误差的控制、检测质量体系的运行、检测数据处理的原则和检测报告的编制等。     

驻厂监造工作中的质量管理

运用全面质量管理的方法,通过对驻厂监造人员、设备、计划、实施细则、记录、报告、档案和HSE管理等几个方面的分析,认为驻厂监造工作必须严格按照全面质量管理,才能不断提高驻厂监造工作质量和水平,并提出了一些合理化的建议。     

声波透射法在混凝土灌注桩桩身完整性检测中的应用

对于大直径混凝土灌注桩的检测来说声波透射法是当前最可靠的方法之一,能够相当准确的判别桩的各类缺陷。本文介绍了声波透射法的基本原理,在检测过程中需要注意的各类问题。通过现场检测实例提出了桩身存在缺陷时声学参数的几种特征。     

Spontaneous visualization and concept evaluation

This paper proposes that customers often respond to brand extension concepts by visualizing the product. We call this process spontaneous visualization and suggest that it precedes concept evaluations. In two studies, we show that spontaneous visualization is enhanced by the fit between the parent brand and the extension category and by the ease with which the product category can be imagined. The appeal of the visualized image in turn determines whether visualization enhances or decreases concept evaluations. In addition, we find a stronger link between product evaluations and delayed choice when evaluations are based on visualization; evaluations based on visualization hence appear to be more “valid” in the sense of predicting subsequent behavior. Implications of these findings and ideas for future research are discussed.

岩滩水电厂3 6万kVA主变压器水冷却方式的控制特点

岩滩水电厂机组单机容量为30.25万kW·h,主变压器为三相三柱式,容量为36万kVA。因受到当时制造工艺、技术要求以及运输路线的限制,致使大容量的主变压器做成体积小巧的三相三柱式,在运行过程中主变压器油温长期处于高温状态下,特别是夏季大负荷时主变压器油温达到65℃以上,对主变压器的安全运行形成潜在安全隐患。岩滩水电厂的主变压器采用水冷却方式后,主变压器油温降低了近20℃,在夏季最大负荷情况下温度基本保持在47℃左右,达到了改造前的预期目的。