集成运放的一些使用技巧

目前集成技术飞速发展且集成芯片已被广泛应用 ,为了充分利用集成在一个芯片上的两个运算放大器性能互相匹配的特点 ,本文从三个方面介绍了合理使用集成运算放大器的几种技巧。其中 ,利用集成在一个硅片上的两个运算放大器的输入失调电压极其温度漂移相互补偿的原理 ,组成了失调电压极低的运算放大器 ;根据输入电阻的自举扩展原理 ,利用集成在一个硅片上的两个运算放大器组成的反向比例运算放大器具有很高的输入电阻和较高的电压放大倍数 ;根据差动放大电路的输出电压方式 ,利用集成在一个硅片上的两个运算放大器组成的差动输出运算放大器 ,最大线性输出电压范围比一个集成运算放大器的最大线形输出电压范围大一倍。且适用于不接地负载。     

Joint oligopsony-oligopoly in the U.S. leaf tobacco market, 1924–39

The leaf tobacco marketplace is highly organized. Prior to 1940, the few large tobacco companies controlled that organization explicitly. The question is whether this organization set oligopsonistic leaf prices or minimized production and transaction costs. A model of joint oligopsonyoligopoly shows that pricing of cigarettes and leaf tobacco was unified: oligopolistic cigarette pricing was sufficient to curtail both cigarette production and leaf purchases. The companies could just bid in the market for the leaf necessary for that cigarette production rate.Prima facie, the organization was not for oligopsony coordination. The implied econometric model of pricing fits observed behavior well.Malcolm Boyd, Dennis Carlton, John Garen, Stephen Karlson, Li Way Lee, An-loh Lin, Robert Miller, Stephen Spurr and the referee have given me thoughtful, perceptive and useful comments. I am pleased to acknowledge their involvement without implicating them in whatever errors remain.     

技术创新产品与边际成本定价

自从有了商品以来,人们便一直关心任何能让自己更富裕、生活更舒适。经典的经济学理论可以解释很多实际现象,但人们发现,越来越多的现象无法由此解释,要弄清这一问题,我们不得不考虑技术创新的一些性质。     

企业生命周期与技术生命周期的联动机制及其组织结构特征研究

企业成长的周期性是经济周期发生的微观基础,探索技术创新与企业规模关系的微观机理可以从企业生命周期与技术生命周期的联动机制入手。在分析了企业生命周期与技术创新关系,以及技术生命周期与技术机会关系的基础上,文章提出企业生命周期与技术生命周期并非以时间为联动依据,而是在一定时间内通过分散决策与集中决策的力量对比形成联动机制,这一机制能够大致刻画出两个生命周期之间互动的传导性,最后分析了作为这种联动机制载体的组织结构特征。     

The problems of supplying water to third world cities: Bulawayo's water crisis

The current drought in central and southern Africa has focused attention on issues relating to the provision and supply of potable water. In the case of Bulawayo, Zimbabwe's second city, there is the very real prospect that water supplies may be exhausted before the onset of the next rainy season. This paper explores the background to this problem and shows how poor planning, financial constraints, and political intransigence have failed to keep pace with a policy aimed at the provision of water to the inhabitants in this expanding urban environment Alternative sources of supply. in particular a pipeline to the Zambezi River, are also investigated.     

Organizational Culture,Leadership Behaviors,and Employee Attitude in Chinese SMEs＂ Empirical Evidence

This study examines the impact of organizational culture on leadership behaviors, as well as the influence of leadership behaviors on employee attitude in Chinese small and medium-sized enterprises （SMEs）. Based on previous researches, this study establishes a conceptual model that indicates the two types of influential relationship. Data are collected from 515 subordinates of 23 SMEs in Chengdu of Sichuan province. By using statistical methods, findings of this study are concluded. Directions for future research are also discussed.     

State-of-the-art of Russia’s heat supply systems

The paper overviews the contemporary state of Russia’s heat supply systems and fuel consumption within its centralized part, the structure of heat consumption by economic sectors and types of industrial consumers. As shown, the centralized heat supply systems, providing the major part of country’s economy with low temperature heat, have heat losses and accident rate at a critical level. The state of decentralized heat supply systems of low rise buildings is not covered by national statistics at all. A second paper on the prospects and development of Russia’s heat supply systems will be published in a subsequent issue.     

刍议基差在期货交易中的运用与地位

本文首先通过分析不同期货品种基差的构成及基差正负所表现的市场意义揭示基差的内涵;然后根据对各种具体期货交易模式的分析归纳出对期货交易创新具有指导意义的基差原理和基差思想;最后指出,基差作为重要的分析工具,基差原理和基差思想作为重要的交易理念,在期货交易中具有重要地位。     

全球化背景下中国人才流失的环境因素——基于全球58国的比较分析

在经济全球化背景下,发展中国家人才流失问题突出。中国同样面临着这个问题的严峻考验。本文从考察人才流失的环境角度进行分析,建立了人才环境三级指标体系并计算出生活环境指数、工作环境指数和宏观环境指数。通过建立回归方程,我们发现人才流失和环境指数有很强的相关关系,说明改善人才环境能很好解决当前人才流失问题。文章最后根据我国实际情况,给出了相关的政策建议。     

A re-examination of the forward exchange rate unbiasedness hypothesis

A Re-Examination of the Forward Exchange Rate Unbiasedness Hypothesis. — This paper applies the Phillips and Hansen estimation and inference procedures to re-examine the hypothesis that the forward exchange rate is an unbiased predictor of the future spot exchange rate. The results indicate that the 90-day forward exchange rate is not an unbiased predictor. However, the 90-day forward and future spot exchange rates are cointegrated. Only for the U.K. pound/U.S. dollar exchange rate is there an error correction representation. Overall, however, the evidence is consistent with the hypothesis that risk-averse agents in the forward foreign exchange market form expectations rationally.