单本振二次变频方案浅析

介绍了一种新型的变频方案,采用单本振源即可实现二次变频,还能保留传统二次变频方案的优点,简化了本振源的实现,有利于小型化和集成化.对该新方案进行了理论分析,进而对这种改进二次变频方案提出了采用的频率配置关系和中频滤波器参数设计准则,并结合一个工程实例完成了相关设计.文中所讨论的方案也同样适用于其它频段.     

工程施工机械管理

机械设备的作用随着科学技术水平的不断进步及管理科学的发展变得越来越大。工程机械管理工作也显得更为重要,需要加以重视开展。本文结合工作经验,通过对施工机械设备在使用中的管理及管理存在的问题进行解析,提出加强工程机械管理的措施,希望对相关人士能起到参考的作用。     

Teaching Inflation Targeting: An Analysis for Intermediate Macro

Over the last decade, many central banks have adopted policies known as inflation targeting. If intermediate-level macroeconomics students are to be prepared to think about current policy issues, it is important to provide them with an introduction to the macroeconomic implications of inflation targeting. Unfortunately, the standard aggregate demand-aggregate supply frameworks commonly used to teach intermediate macroeconomics are not well suited for this task because they are expressed in terms of output and the price level and because they fail to make explicit the policy objectives of the central bank. The author provides a simple graphical device involving the output gap and the inflation rate that overcomes these problems and that can be used to teach intermediate macroeconomics students about inflation targeting.     

Structural VAR models for Malaysian monetary policy analysis during the pre- and post-1997 Asian crisis periods

This article conducts an in-depth investigation into building a Structural Vector Autoregression (SVAR) model and analysing the Malaysian monetary policy. Considerable attention is paid to: (i) the selection of foreign, policy and target variables; (ii) establish identifying restrictions and improve the estimates of impulse response functions; (iii) assess the importance of intermediate channels in transmitting monetary policy mechanism; and (iv) the way in which the 1997 Asian financial crisis affected the working of monetary policy. Malaysia is an interesting small open economy to study because, following this crisis, the government imposed capital and exchange rate control measures. The overall results suggest that the crisis and the subsequent major shift in the exchange rate regime have significantly affected the Malaysian ‘Black Box’. In the pre-crisis period, domestic variables appear to be more vulnerable to foreign monetary shocks. Further, the exchange rate played a significant role in transmitting the interest rate shocks, whereas credit and asset prices helped to propagate the money shock. In the post-crisis period however, asset prices play a more domineering role in intensifying the effects of both interest rate and money shocks on output, and the economy was insulated from foreign shocks.     

油田钻井设备常出现的故障及解决策略

在日常生产实践中,油田钻井机械设备常出现损坏等问题,直接致使钻井作业被迫中断,设备的整修与恢复期限较为长久,在很大程度上损害油田生产的效益。本文首先分析油田钻井设备常遇到的故障表现及其原因,接着就防范和解决这些故障提出合理化建议。     

浅谈如何对沥青拌合站除尘设备进行维护与改进

本文就沥青拌合站除尘设备的工作原理,及对沥青拌合站除尘设备进行维护与改进的办法进行探讨。     

节能技术在建筑设备工程中的应用与探讨

伴随着我国经济高速发展、产业结构调整及世界性能源紧缺的大背景下,建筑节能已经成为建筑行业必须面对、考虑和解决的问题。本文从建筑设备工程所涉及的给排水管网系统的减压节流、水泵的变频控制,空气调节系统节能技术,电气系统节能技术等几方面进行阐述。节能技术在建筑设备工程中的应用与开展,有着重大的社会效益、经济效益和业主效益,同时也是社会和建筑行业发展的必然。     

The increasing service intensity of European manufacturing

In this study, using fixed-effects models based on the manufacturing sector for 18 European Union countries for the period 1995–2008, we find that the employment share of service occupations is significantly and positively related to the output share of producer services in manufacturing. In particular, the increase in the output share of services accounts for an average of 13% of the increase in the share of service occupations. When service occupations are disaggregated by different categories, we find that the output share of services is significantly and positively related to the share of managers, professionals, and technicians. In contrast, the remaining service occupations do not benefit from the increase in service revenues. Finally, professionals and technicians are complementary to purchased services (from either domestic or foreign suppliers).     

现代钢铁企业冶金设备概述

本文全面介绍了近年来国内外冶炼设备的基本情况和发展前景,对现代化钢铁企业当中的炼铁设备,炼钢设备以及连铸设备都有所涉及,并提出了自己的观点和看法,总结了未来钢铁设备的发展趋势。     

议数控设备维修技术

数控设备是一个集机械、电子等完整系统的机械。数控设备每一环节都要精心维护,才能确保设备正常运作。