中频接收机数字化设计中的几个关键问题

本文以短波数字化中频接收机为例，讨论中频数字化接收机设计的几个关键问题，包括收机前端增益的确定、数字和模拟AGC门限的选取、二中频频率与取样率的选择、以及接收机信噪比（SNR）的核算。     

特种高收益风险债券──风险投资的金融创新

风险投资是指投资者以获得红利或出售股权获利为目的，出资协助具有专门技术而无自由资金的企业或个人实现创业，承担创业阶段的失败风险并将回收资金循环投入高风险事业。但是，由于种种投资类型所固有的特征，它所涵盖的投资主体和投资对象都会受到一定的限制。因此，设计一种特种高收益风险债券，这种债券能够弥补传统风险投资的缺陷，吸引更多业绩良好的中小企业或是具有特殊性的行业及企业进入风险投资领域，成为高科技企业融资的新选择。     

The endogeneity of the natural rate of growth – an empirical study for Latin‐American countries

The aim of this paper is to analyse the sensitivity of the natural rate of growth to the actual rate of growth for a sample of 11 Latin‐American countries, assuming the natural rate to be determined endogenously by changes in the actual rate of growth. The natural rates of growth are estimated in a system of SUR estimations over the period 1986–2003. In order to determine whether they react endogenously to changes in the actual rate of growth, a dummy variable for boom periods is added to the system of regressions. The results confirm the hypothesis about the endogeneity of the natural rate of growth.     

Empirical analysis of real and financial volatilities on stock excess returns: evidence from Taiwan industrial data

This paper tests the relation between stock excess returns and risk factors measured by volatility. The sources of the volatility are based on the volatility of macroeconomic factors and time-series volatility. To model the macroeconomic fundamentals, we divide the risk into real and financial volatilities pertinent to Taiwan's economic environment. By examining the data of indusry excess returns and market excess returns, we find evidence to reject the hypothesis that the stock excess returns are independent of the real and financial volatilities.     

Accounting for Negative,Zero and Positive Willingness to Pay for Landscape Change in a National Park

In contingent valuation, despite the fact that many externalities manifest themselves as costs to some and benefits to others, most studies restrict willingness to pay to being non‐negative. In this paper, we investigate the impact of allowing for negative, zero and positive preferences for prospective changes in woodland cover in two UK national parks, the Lake District and the Trossachs. An extended spike model is used to accomplish this. The policy implications of not allowing for negative values in terms of aggregate benefits are also investigated, by comparing the extended spike model with a simple spike making use of only zero and positive bids, and a model which considers positive bids only. We find that ignoring negative values over‐states the aggregate benefits of a woodland planting project by up to 44%.     

欧元诞生以来的表现及原因分析

欧元自正式启动以来 ,汇价一路下滑 ,屡屡跌破历史新低 ,大大超出世人所料 !文章通过分析道出个中缘由 :欧元区国家近年来经济增长放缓 ,各国间经济增长速度快慢差异巨大 ,使汇率缺乏基本支撑力和货币政策的极难协调 ;欧洲央行对其跌势持放任态度 ;几年来 ,欧元区资金外流严重 ,短期内较难逆转 ;欧盟空袭南联盟 ,使本已十分脆弱的欧元汇率下滑趋势加大 ;最后 ,也是较为主要的原因之一 ,即欧元汇率定值过高 ,欧元与其所涵盖的经济总量呈弱相关。然而 ,我们并不能就此认为欧元已经失败。从长期来看 ,欧元仍将是一个比较稳定的货币 ,并将在国际货币体系中发挥重要作用。     

An interest rate peg might be better than you think

Active interest rate policy is frequently recommended based on its merits in reducing macroeconomic volatility and being a simple device. Yet, it might be outperformed by an even simpler policy. A peg can be welfare-enhancing and can uniquely be implemented.     

论虚拟企业及其对国企改革的借鉴

随着技术与通讯的发展 ,先进的技术产品加上迅速高效的信息传输给企业带来无数商机。而怎样抓住这些机遇 ,各国企业无不积极采取新作法。虚拟企业在众多作法中脱颖而出 ,备受瞩目。本文首先对虚拟企业这一概念作一概述 ,然后论述虚拟企业给我们的启示及对国企改革的借鉴。     

关于教育与就业关系的一个理论模型及实证检验

In this paper, we divide the process of educational development into two aspects: the change in educational structure and the expansion of educational scale. Based on this hypothesis, we analyze the relationships between each of the two aspects and employment respectively. In this paper, the factors and the transmission mechanism of the influence that education has on employment are also explained. Then, the theoretical models of the relationship between education and employment are built up. Finally, we use the empirical data collected in China to test the theoretical models and give explanations to the status quo of the unemployment structure within various educational levels. It suggests that: the development of education in China at present is beneficial to the increase in the employment rate, the increase in the proportion of the laborers with junior school education has negative effects on employment, and the development of higher education creates positive effects on the employment, but no evidence shows any significant correlation between the proportion of the laborers with senior high school education and the unemployment rate. Translated from Xin Zhengzhi Jingjixue Pinglun 新政治经济学评论 (Review of New Political Economy), 2006, 2(1): 46–69