Synchronization and diversity in business cycles: a network analysis of the European Union

In this article, we use a correlation matrix and its internal networks to analyse business cycle synchronization across Europe since 2000. This methodology allows us to summarize individual country interactions and co-movements while also capturing the existing heterogeneity of connectivity within the European economic system. Our results indicate that synchronization of the euro zone countries remained stable from 1999 until the current financial crisis, after which co-movements increased sharply and synchronization rose to the highest in the time sample. By endogenously identifying clusters of countries with close connections in their business cycle, we also refute the commonly accepted notion of identifiable core and peripheral euro zone countries.     

装载机装运机构改进设计

全液压蟹爪式装煤机的侧取耙装机构与刮板运输机串联工作,共用一套传动装置,但不能适应作业现场实际需要.为此,重新设计装运机构,将装载与运输机构设计为联动机构,让其既可各自独立运转,也可根据需要联合作业,同步工作.2套独立的动力装置能够保证2个机构可靠运转.     

New Product Introduction and Seasonality Effect in Food Products Retailing

ABSTRACT

This study aims to measure the effects of market demand and seasonality on new product introduction. Major factors contributing the variability of market demand and seasonality of new products have been discussed in reference to timing of introducing new products, variability of consumer preferences, retail sales, and product promotion. The study is based on 243 new products in selected self-service stores in Mexico, which belong to major food products sectors for the reference period 2002–2006. Results of the study reveal that market demand and seasonality factors are most important for the timing of new product introductions, as such conditions determine success of the new products in a given market.     

一种适用于宽带短波通信OFDM系统符号定时同步的新方法

针对宽带短波通信正交频分复用（OFDM）系统,提出了一种不需要数据辅助的高效符号定时同步方法。该方法利用OFDM符号中的空载波不传输任何数据这一特性,通过最小化空载波上的数据能量来将符号定时点锁定在安全区域内,从而完成符号定时同步。该方法可以有效对抗多径效应,适用于短波通信系统。最后将该方法与Al-Dweik同步方案在宽带短波信道条件下进行了仿真对比,结果表明该方法有着更精确的符号定时同步性能,并且适用于各种星座图调制。     

Fast fashion: response to changes in the fashion industry

The fashion apparel industry has significantly evolved, particularly over the last 20 years. The changing dynamics of the fashion industry have forced retailers to desire low cost and flexibility in design, quality, and speed to market, key strategies to maintain a profitable position in the increasingly demanding market. This article reviews the literature on changes that have happened in the fashion apparel industry since the 1990s, highlighting the emergence of a concept of ‘throwaway’ or fast fashion. It describes fast fashion from a supplier as well as a consumer's perspective, and draws attention to several potential research issues.     

非自治混沌系统未知参数的识别

基于推广的微分方程不变原理,设计了一个简单的自适应反馈控制器,并证明了在这一控制器的作用下,可以识别出非自治混沌系统中的未知参数.这一识别方法简单便于工程实现,且具有鲁棒性.对于Duffing-Van der pol系统和Duffing系统的数值模拟验证了我们的结论.     

中式快餐业的五因素模型分析

目前,我国快餐业发展势头强劲,行业规模不断扩大。但中式快餐面临着现实的很多限制条件和跟洋快餐抢占市场等问题,与西式快餐还存在显著差异。本文运用波特在竞争战略中的“五因素模型”,对中式快餐业的发展进行了分析,并由此提出了相应的发展策略。     

粮食两种水分测定方法的比较分析

文章探讨了粮食烘箱水分测定法和快速水分测定法的差异。     

“中部崛起”战略实施以来中部经济发展存在的主要问题及对策

中部地区自国家实施"中部崛起"战略以来,在经济规模、环境保护、基础设施等方面取得了不少的成绩,但是也存在着许多不容忽视的问题,主要有合作协调不够、创新能力不强、环境保护压力比较大、产业结构升级缓慢、城市化水平低、县域经济也还比较弱小。为此,只有加强中部地区的彼此合作,增强创新能力、加快产业升级、壮大县域经济、加强环境保护、扩大对外开放,才能促进中部地区更加和谐快速的发展。