Timing is everything: A meta-analysis of the relationships between organizational performance and innovation

The relationship between innovation and firm performance has been uncertain. In previous empirical tests of both causal directions of the organizational performance and innovation relationship, the temporal sequence of research designs has often been flawed. We meta-analytically test both temporal sequences of this relationship using 158 effect sizes from 55 empirical studies. We find that many empirical studies hypothesized one temporal sequence (e.g. innovation and future performance), but used data based on the opposite temporal sequence (e.g. past performance and innovation). Correcting the studies based on the actual temporal sequence used reveals that while the relationship between innovation and future performance is positive (based on economic rent-seeking), the relationship between past performance and innovation is less clear, especially when the study's framing is taken into account. Focusing on temporal sequencing suggests new research avenues on the organizational performance and innovation relationship.     

危险化学品泄漏事故的混沌动力学特性分析

为探讨如何有效地预防和控制危险化学品泄漏事故,运用混沌理论方法对焦作市某化工厂泄漏事故统计数据进行了时间序列分析和R/S分析,指出危险化学品泄漏事故具有明显的混沌特性。分析和讨论了危险化学品泄漏事故的混沌特性,并对后续短期内可能发生的事故进行了预测。     

莺山地区登娄库组层序地层与油气勘探意义

应用层序地层学的理论和方法,针对研究区的地质概况,综合分析地震、测井、岩心等资料,对莺山地区的层序界面进行识别,共识别出5个三级层序界面(SB1-SB5)。研究区的登娄库组是一套完整的超层序,共发育三个体系域,自下而上为低水位体系域、水进体系域、高水位体系域。在层序格架内,总体以冲击扇、扇三角洲、辫状河三角洲、泛滥平原等相配的沉积体系为主。研究区由下而上共发育3套生储盖组合,表明该区具有一定勘探潜力。     

火电厂热工自动化及事故防范的探讨

社会经济飞速发展中,科学技术在不断地进步,促进了火电厂热工自动化的发展。大型发电组中最重要的组成部分就是热工自动化,它能够保障设备的安全,提高发电组的工作效率。如今的电力生产中火力发电组是主要的形式,在操作中火电厂热工自动化也会引发一系列的安全事故。本文将针对火电厂热工自动化和事故防范进行探讨。     

Limit theory for panel data models with cross sectional dependence and sequential exogeneity

The paper derives a general Central Limit Theorem (CLT) and asymptotic distributions for sample moments related to panel data models with large n$n$. The results allow for the data to be cross sectionally dependent, while at the same time allowing the regressors to be only sequentially rather than strictly exogenous. The setup is sufficiently general to accommodate situations where cross sectional dependence stems from spatial interactions and/or from the presence of common factors. The latter leads to the need for random norming. The limit theorem for sample moments is derived by showing that the moment conditions can be recast such that a martingale difference array central limit theorem can be applied. We prove such a central limit theorem by first extending results for stable convergence in Hall and Heyde (1980) to non-nested martingale arrays relevant for our applications. We illustrate our result by establishing a generalized estimation theory for GMM estimators of a fixed effect panel model without imposing i.i.d. or strict exogeneity conditions. We also discuss a class of Maximum Likelihood (ML) estimators that can be analyzed using our CLT.     

物流系统混沌边界确定及其模型效应分析

混沌理论作为解决经济系统中存在的大量非线性问题的一种全新研究方法,借助其非线性动力学模型对物流系统这一典型非线性复杂经济系统边界进行界定,有助于物流系统的正常运行.物流系统涉及交通运输、工业生产、商贸流通、邮政通信等各行各业,并受经济政策、产业环境及社会环境等诸方面因素的影响,必须按系统、分层次明确各级物流系统(企业物流系统、区域物流系统、物流供应链跨行业混序系统和社会物流大系统)的边界范围及其所包含的要素,并以此为基础分析物流系统的混沌特性和范围界定.文章通过测度系统的熵对系统是否产生混沌进行判定,能够对企业物流系统状态进行定量化描述,表征企业系统状态的复杂与有序程度,确定物流系统内部的不确定性,可以有效控制物流系统,实现物流系统经济效益的最大化.     

直接序列扩频信号数字科斯塔斯坏的分析与设计

本文介绍了一种用数字costas环对直接序列扩频信号进行解扩解调的原理,阐述了各部分电路的实现方法,得出的结论对工程设计有一定的参考价值。     

我国城乡差距的政策性因素分析——基于亚当·斯密城乡发展思想

市场经济理论之父亚当·斯密曾在他的不朽名著《国民财富的性质和原因的研究》一书中阐述了有关城乡发展的思想。根据亚当·斯密的城乡发展思想,对当前我国城乡差距的原因,进行了宏观政策层面上的分析,可为缩小我国城乡差距提供借鉴。     

Transnational Economists in the Eurozone Crisis: Professional Structures,Networks and Ideas

ABSTRACT

In recent years IPE and EU studies scholars have examined how actors in international organisations and EU institutions shape policy ideas. This article explores the professional structure of economists affiliated to two Brussels-based think tanks, Bruegel and CEPS, who, in the context of the Eurozone crisis, sought to contribute to the production of policy solutions to douse the flames of the crisis and put forward long term recommendations for the EMU’s stability. Through the analysis of more than 300 CVs and by drawing on network and sequence analysis, the article shows that in their search for solutions, Brussels-based think tanks bring together economists from different EU member states, whose authority draws on academic qualifications, experience, and seniority. They are ‘multiple insiders’ connected to a wide range of institutions and professional networks, who move back and forth between professional and organisational networks and serve as bridges between revisionist, orthodox, and mixed economic ideas.     

Lorentz序列空间一致凸与一致非方等价

本文给出了 Lorentz 序列空间一致非方的充要条件。同时当 p>1时,一致凸与一致非方等价。