TM_(010)模圆柱腔GUNN振荡器

本文论述了 TM_(010)模式圆柱腔 GUNN 振荡器的理论基础、设计原理与使用特点。这种振荡器在微波技术中作为中精度、小功率信号源在测量、雷达、微波通信、卫星通信以及微波报警器等方面有广泛的应用。     

Does culture matter for the economic performance of countries? An overview of the literature

From the point of view of economic development, the world is far from being homogeneous. Among the possible causes of such uneven evolution, culture is starting to attract the attention of a growing number of scholars. The present paper surveys some of the most important contributions on culture and economics, with a particular focus on the definition and measurement of culture and on the impact of different cultural traits on economic variables. According to this review of the literature, cultures emphasising individual effort while providing equal opportunities for everyone are more likely to encourage sustained economic growth.     

Overlapping generations models with realistic demography

This paper revisits the literature on overlapping generations models in the demographic context of a continuous age distribution and a general age schedule of mortality. We show that most of the static results known for the 3 or N age-group models can be extended to the continuous model. Some results, previously established for economies without capital, are extended to productive economies. We also make some progress on the existence of some steady states as well as on the dynamic properties. Received: 27 March 2000/Accepted: 25 April 2001