Are returns to education on the decline in Venezuela and does Mission Sucre have a role to play?

Anecdotal evidence points to a falling standard of living for the educated in Venezuela. During this same period, President Hugo Chávez implemented several education reforms. We focus on a major university education reform known as Mission Sucre and its potential impact on returns to university education. First, we show that returns to education decreased significantly in Venezuela from 2002 to 2008. Subsequently, we explore the impact of the program on non-program participants and provide evidence that a substantial part of the falling returns at the tertiary level can be linked to Mission Sucre. Our results suggest that the reform created a negative externality on students who did not participate in the program, leading to a 2.7 percentage point decline in returns to university education for non-Mission Sucre students in the 23–28 age cohort.     

男子200m跑运动员专项素质与运动成绩的关系

通过对男子200m跑专项素质的研究,找到影响200m成绩提高的主要专项素质的排序与二者的关系,为今后男子200m跑教学与训练提供科学的参考依据。     

在荒岛上迎接黎明——王小波最初的文学宣言

王小波的写作是一种自我抗争的写作，他以此表达并实践他对于人生的理解．那就是要独立地、有意义地度过一生，在最后的时刻可以如此告慰自己：活过，爱过，写作过。在这个立足点上，他的写作包含了对于一切与之相悖的东西的抗争：向虚无的抗争，向现实的抗争，向文坛话语圈的抗争。他的身影和他的创造在我们贫乏的生活上打开了希望的窗。《我在荒岛上迎接黎明》是他写作最初的宣言书，也是他一生的精神写照。     

从视觉文化缕析象形拳美的根源

文章从视觉文化观照象形拳,认为:以"内视"为主的象形拳具有"立象以尽意"、"物我合一"的美学特征;它会给观众带来"内模仿"的快感,"游戏"形式的亲昵感,以及"物趣"盎然的审美状态。     

Honeywell EPKS C200系统在PVC装置中的应用

本文介绍了青海盐湖工业集团股份有限公司化工分公司10万t·a^-1PVC装置聚合工艺的特点和控制要求,以及Honeywell EPKS C200系统的硬件、软件配置和控制方案。     

Distributed delay input shaper design by optimizing smooth kernel functions

The aim of this paper is the development of a general class of input shapers with distributed time delay which leads to retarded spectral properties. The design of the shaper is formulated as a multi-objective optimization problem, where response time and robustness, expressed in terms of residual vibrations, are the main objectives. As a part of the optimization formulation, common requirements for input shapers such as non-decreasing step response and unity steady state gain are considered in the design. Moreover, additional optional requirements, such as smoothness of a step response, jerk and even jounce limits can be added to optimization procedure. The resulting problem can be solved using convex optimization techniques. Several illustrative examples are presented in comparison with classical input shaping techniques. Finally, implementation aspects are discussed. The paper is accompanied by an implementation in MATLAB, including a user-friendly interface for the interactive shaper design.     

浅谈如何在PLC实训中解决I／O的不足

随着社会的发展,越来越多的技工学校开始开设PLC的课程。在技工学校的PLC实训教学中,偶尔会遇到I／O点不足的问题。本文主要针对在实际训练的过程中,如何解决I／O的不足,并给出几种解决方法。     

基于Asterisk的高校图书馆VoIP语音服务研究

以美国Digium公司开发的一个开源软交换项目Asterisk为例,讨论高校图书馆开发VoIP语音呼叫系统的必要性和可行性。在此基础上对图书馆语音呼叫服务进行系统需求分析、系统的业务数据和对象的逻辑分析,最后通过案例分析说明Asterisk在图书馆的应用效果。     

对"default pathway"译法的一点建议

对于“default pathway”,国内的一些资料不妥,本文拟对此作一些解释。     

力竭运动对血清高亲和力生长激素结合蛋白(GHBP)及胰岛素样生长因子(IGF-I)水平影响的研究

为了解运动对血清IGF I和GHBP水平的影响 ,测定了天津体育学院中长跑专项学生 (男 10人 ,年龄 2 0 .0 0± 1.4 1)安静时和短时间递增负荷力竭运动后即刻IGF I和GHBP的浓度 ,并进一步探讨运动所引起的GH IGF轴的自身调节和作用机制