混合拉曼/EDFA放大器及其在DWDM中的应用

本文综述了混合拉曼／掺饵光纤放大器（HFA）的工作原理，结构和特点，介绍了4类HFA基本结构及其实验结果，并通过介绍近年来各类HFA在密集波分复用（DWDM）系统中的应用表明了HFA在带宽，增益和噪声特性方面的优点。     

CREDIT CYCLES REDUX*

Theoretical studies have shown that under unorthodox assumptions on preferences and production technologies, collateral constraints can act as a powerful amplification and propagation mechanism of exogenous shocks. We investigate whether or not this result holds under more standard assumptions. We find that collateral constraints typically generate small output amplification. Large amplification is obtained as a “knife‐edge” type of result.     

发展现代物流开掘新的利润源

随着经济的全球化，现代物流业在国内已逢勃发展，通过大量的资料和数据，说明了现代物流业已成为国民经济的重要支撑点，是新的“利润源泉”，指出了我国如何加快现代物流业的举措。     

Bank Equity Investments: Reducing Agency Costs or Buying Undervalued Firms? The Information Effects

Abstract:   This paper analyses the relevance of two different reasons for banks to acquire firms' stock: the increase of agency costs in the lending relationship (the agency costs hypothesis), and participation in the expected profits of undervalued firms (the information asymmetry hypothesis). Results indicate not only that banks make equity investments for both reasons but also that the market exploits their lending decisions to learn which of the two motivations was in play. Bank equity investments concurrent with reductions in bank debt are consistent with the agency costs hypothesis, whereas bank equity investments concurrent with increases in bank debt are consistent with the information asymmetry hypothesis.     

Scarcity and appropriative competition

This paper formalizes the commonsensical hypothesis that resource scarcity causes a large allocation of time and effort to appropriative competition. Our main innovation is to model explicitly the positive intertemporal effect of consumption on the probability of survival. The critical assumption is that this effect becomes stronger as resources become scarcer. We also show that anticipated future resource abundance increases the incremental value of survival and, consequently, amplifies the current allocation of time and effort to appropriative competition. Interestingly, if resources are currently scarce, then larger anticipated future abundance can cause a big enough increase in the time and effort allocated to appropriative competition to result in a decrease in the sum of current and expected future utility, a “paradox of anticipated abundance”.     

外贸公司，奶酪还有多大

2006年2月10日，厦门第一家纯外资贸易公司——亿明（厦门）贸易有限公司成立。注册资金仅2000万日元，虽然市外贸局外贸处曾文生处长对记者表示，这家公司还没有到厦门市贸易发展局登记。但外界纷言。亿明（厦门）贸易有限公司的成立，有着特殊意义，标志着更规范意义上的跨国公司采购时代来临了。尽管它的成立比法国欧尚进入上海晚了4年。[编者按]     

How Does a Development Moratorium Affect Development Timing Choices and Land Values?

This paper investigates how a development moratorium affects choices of development timing and land values in a framework where both the value of developed property evolves stochastically and the development costs are fully irreversible. We assume that a regulator initially announces that land is not allowed to be developed during a finite period of time in the future. A developer, thus, must decide whether to develop land before the timing ordinance is imposed, or after it expires. The development moratorium reduces the developer’s option value from waiting and, thus, accelerates development. We also use simulation analysis to demonstrate how the other factors that relate to the demand and supply conditions of the real estate market affect this accelerating effect.     

废线路板热解处理研究现状

综述了近年来国内外废旧线路板热解处理技术研究现状。着重介绍了废旧线路板热解回收的工艺、热解产物、热解机理和动力学等方面的研究进展，讨论了热解回收技术存在的问题和发展方向。