河南省十二五期间城镇化过程中农民生活方式的转变研究

国家＂十二五＂规划纲要明确提出加强农村基础设施建设和公共服务,把新农村发展和农村城镇化建设提升到一个新的高度。文章着重分析了城镇化过程中河南农民这一特殊群体所受影响的方方面面,深入探讨了城镇化过程中河南农民生活、体育锻炼方式转变中的进步和困难之处,并有针对性的提出了提高城镇化过程中农民的生活、体育锻炼环境的建议。     

新媒体的新值域:短信产业研究——04、05年广播动态及相关研究述评

中国短信发送量6年增长300余倍,已形成全球最大的短信市场。本文结合产业经济学原理与传播学理论,分析了短信业在中国及全球迅速发展的客观必然和未来趋势。文中的核心观点认为:短信产业的迅猛发展,一方面归功于内在的简约原则及边际概念的建立,另一方面则得益于新媒体技术的双向互动特性,对单向大众传播模式中隐性垄断权的有效突破,让人们在双向互动的新传播模式下,从海量信息的高压传播中得以舒解,重获必要的从容,以便进行即使是“碎片化”的思索。这一基于双向互动传播的简约化市场,不仅已经成就出一个短信产业,而且必将渗透和孕育出更多的新兴和传统产业。     

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.     

莘数理论(Ⅲ)

在莘数理论(Ⅰ)、(Ⅲ)的基础之上，对层函数和不等式的内容作了初步的探讨，并在OX1，和OSP的范围内给一个历史趣题以进一步的解释。     

从“泉州模式”探析泉州“十二五”发展战略

＂泉州模式＂是对泉州人民在改革开放以来取得经济社会发展成效的高度概括,它不仅揭示了泉州过去在经济社会发展中取得成效的成因,也蕴含着泉州今后发展的潜在动力。从＂泉州模式＂发展的视角看,泉州在＂十二五＂期间应在＂全面实施品牌带动战略＂引导下,继续大力发展民营经济和外向型经济,强化县域特色经济;要继续深化企业品牌、产品品牌和产业品牌带动战略;要大力实施第三产业发展带动战略,在有效促进生产性服务业发展的前提下,应着力发展和促进生活性服务业;应大力实施总部经济发展战略,提高区域品牌对区域内外资源的吸引力,促进区域经济持续健康发展;要大力实施政府品牌形象塑造战略工程,推进和深化公共服务型政府建设进程,尽快建立公共服务满意度测评机制,为全面实施品牌带动战略提供有力支撑。     

基于USB和蓝牙的单片机温度监测系统的设计

介绍一种基于USB和蓝牙的单片机温度监测系统,以单片机芯片AT89S52为核心,结合外围USB芯PDIUSBD12、蓝牙芯片BC4、温度监测芯片DS18B20等,实现了对温度的监测。系统采用蓝牙无线通信协议,实现数据的无线传输。具体阐述了软硬件的设计并给出了部分硬件电路图和程序流程图。     

高钨含量钽合金氩弧焊接工艺研究

采用质量百分比为12%的Ta-12W合金板材进行对接自熔氩弧焊和加钛焊料氩弧焊实验,观察了焊缝区的金相组织,分析了焊缝区的成分,并测试了焊接强度.实验结果表明：Ta-12W合金板材采用氩弧焊焊缝强度不高,拉伸断裂均发生在热影响区;加钛焊料氩弧焊接Ta-12W合金板材并未焊合,且焊缝处的成分扩散很不均匀;Ta-12W合金板材采用对接自熔氩弧焊方式优于加钛焊料氩弧焊方式.     

美国部分学区试行教师工资改革的启示

为适应社会发展的需要,美国部分学区正在试行新的教师工资制度:基于知识与能力表现水平的个人工资制.科研机构参与设计并跟踪研究了新工资制试行的过程.研究发现:教师参与制订和执行教学表现评价标准及奖励标准的程度影响着他们对改革措施的态度.美国的改革试验对我国教育管理领域的改革也具有借鉴意义.     

Replication studies in economics—How many and which papers are chosen for replication,and why?

We investigate how often replication studies are published in empirical economics and what types of journal articles are replicated. We find that between 1974 and 2014 0.1% of publications in the top 50 economics journals were replication studies. We consider the results of published formal replication studies (whether they are negating or reinforcing) and their extent: Narrow replication studies are typically devoted to mere replication of prior work, while scientific replication studies provide a broader analysis. We find evidence that higher-impact articles and articles by authors from leading institutions are more likely to be replicated, whereas the replication probability is lower for articles that appeared in top 5 economics journals. Our analysis also suggests that mandatory data disclosure policies may have a positive effect on the incidence of replication.     

Knowledge base combinations and firm growth

The link between knowledge and firm growth has been a core topic in economics of innovation for a long time. However, despite strong theoretical arguments, empirical evidence remains inconclusive. One important reason for this conundrum may be the failure of standard indicators to capture firm innovation activities comprehensively. We contribute to overcoming this limitation by looking in the knowledge processes that drive variegated forms of innovation and aim thereby to establish a solid relationship with firm growth in more detail. Our arguments draw on the differentiated knowledge base approach, distinguishing between analytical, synthetic, and symbolic knowledge. We measure the three types of knowledge bases with detailed longitudinal linked-employer-employee micro-data from Sweden. Econometric findings based on a very large sample of small and medium-sized firms indicate significantly positive effects of the three knowledge types, and in particular combinations thereof, on firm growth. In addition, we show that not only high-growth but also slow-growth firms benefit immensely from the use of combinatory knowledge bases. We find evidence on a curvilinear relation between knowledge bases and growth of firms. Beyond certain thresholds increasing the knowledge bases further results in decreasing firm growth. Our results remain robust in a wide range of specifications and econometric models.