Pro/E及PowerMILL软件在叶片零件加工中的应用

文章以自动编程软件技术应用为前提，以风扇叶片零件为例，主要阐明了Pro/E及PowerMILL软件在数控加工过程中的具体应用。简单描述了叶片的Pro/E造型过程，较为详细的阐述了PowerMILL软件针对风扇叶片零件从工艺参数、加工策略到仿真及程序的后置处理的自动编程过程。根据实际加工表明，自动编程软件的使用，提高了产品加工质量的同时，缩短了零件制造周期。     

基于Pro/E的机械制图国标化的模板文件定制

文章探讨了如何将国标定制到Pro/E软件模板中的方法,主要包括零件模板、组件模板以及工程图模板等的建立方法,最终达到提高设计效率、规范图纸的目的.     

浅谈非线性编辑之应用软件

在当今的视频制作领域,非线性编辑系统以其独特的优势已经占据了主导地位,尤其是目前基于CPU+GPU技术的纯软件非编系统的发展,非编软件也突现出越来越重要的作用。     

政府换届、经济政策与政治经济周期

在梳理政治经济周期理论的基础上,比较中西方国家该理论前提、内在逻辑的差异,并从实际出发提出相关命题,建立计量模型,运用中国1953年～2008年的年度数据进行实证研究.结果表明,"两会"召开周期 (中央政府换届)与经济波动周期之间存在较显著的相关性;中央政府换届导致地方政府交流周期,政绩考核晋升机制使地方政府产生纵向、横向上的竞争,并形成周期性的经济发展举措,进而加大了对经济周期的影响;中央政府政治周期使财政政策、货币政策具有一定的顺周期特征,地方政府通过财政项目竞争、软预算约束以及货币信贷倒逼机制,扩大了财政政策、货币政策的顺周期性;在受到国际经济危机异常冲击时,我国财政政策、货币政策表现出平稳经济波动的特征.     

The cyclicality of bank regulation in a general economic framework

This article utilizes a representative agent model to address how the regulation policies for banks should respond to the general economic condition. With the consideration of a self-fulfilling deposit insurance facility with sufficient bank reserve to meet the expected need of liquidity shock, our model suggests a counter-cyclical capital adequacy requirement in a competitive loan market. The exception might occur when the moral hazard problem becomes very unwieldy and the representative individual is rather risk averse. With regard to the closure policy, we find that it is closely related to the individual’s degree of risk aversion. A counter-cyclical closure policy is recommended when the individual is highly risk averse. Otherwise, a pro-cyclical closure policy is preferred.     

浅谈电工与电子技术虚拟实验室的搭建

随着电子科技技术的飞速发展,极大地推动了电工与电子技术的实验虚拟化进程,一方面使实验不再受时间的限制及实验设备的限制,方便了学生;另一方面降低了实验设备、元器件损耗的成本,提高了教学的质量和效率。文章旨在探究在电工与电子技术实验中如何更好地使用计算机软件,使其弥补传统实验室的不足。     

Endogenous cyclical corporate tax burden in China: The role of tax quotas and growth targets

Using data from China Annual Survey of Industrial Firms and addressing potential endogeneity problem, we find that corporate tax burden in China is procyclical during recessions and countercyclical during booms. The cyclicality is stronger for enterprises whose corporate income taxes are levied by Local Tax Bureau (LTB). Procyclicality of corporate tax burden during recessions is larger for enterprises located in county, non-state-owned enterprises (non-SOEs), non-high-tech enterprises and large-medium enterprises. Furthermore, tax quotas and growth targets of local governments enhance procyclicality during recessions and the countercyclicality of corporate tax burden during booms. Tax collection and government spending are important channels through which tax quotas and growth targets affect the cyclicality of corporate tax burden, respectively. This paper provides important policy implications for China during economic recessions.     

A tale of two states: asymmetries in the UK small,value and momentum premiums

This article performs comparative analysis of the asymmetries in size, value and momentum premium and their macroeconomic determinants over the UK economic cycles, using Markov switching approach. We associate Markov switching regime 1 with economic upturn and regime 2 with economic downturn. We find clear evidence of cyclical variations in the three premiums, most notable being that in the size premium, which changes from positive in expansions to negative in recessions. Macroeconomic indicators prompting such cyclicality the most are variables that proxy credit market conditions, namely the interest rates, term structure and credit spread. Overall, macro factors tend to have more significant impact on the three premiums during economic downturns. The results are robust to the choice of information variable used in modelling transition probabilities of the two-stage Markov switching model. We show that exploiting cyclicality in premiums proves particularly profitable for portfolios featuring small cap stocks in recessions at a feasible level of transaction costs.     

基于Pro/E的机械运动仿真设计

仿真技术在机械产品的设计中起着非常重要的作用.本文主要通过汽缸运动机构的运动仿真设计过程介绍了Pro/E中的仿真模块以及机构仿真的设计方法和过程,并总结了该设计途径的优越性.