MIL—STD—1553B测试问题的探讨

本文在讨论1553B产品的测试原则及阶段划分的基础上,简要地介绍了该类产品验证测试的基本项目及要求,突出强调了该测试问题的迫切性及复杂性。     

C波段高功率微带铁氧体收一发双工器的研究

本文主要叙述了C波段微带铁氧体双工器的特点,分析了微带铁氧体环行器在高峰值功率作用下的损耗机理与设计方法。已研制的微带双工器,成功地应用于航天电子设备。     

一种新颖的相位检测方案

本文介绍一种以正交鉴相技术为基础,MCS—51单片微机为核心的相位检测方案。     

宽带全固态115W脉冲功率放大器

本文叙述了宽带全固态115w脉冲功率放大器的设计和研究结果。在960～1215MHz频率范围内该放大器的增益大于43dB,功率波动小于1.5dB,输出功率为115w。本放大器可用于通信、导航、雷达等设备中作功率发射用。     

Thirty-first international Atlantic Economic conference March 15–22, 1991 Rome

Thirty-first international Atlantic Economic conference March 15–22, 1991 Rome     

从否定市场失灵重新认识政府的宏观调控

市场失灵是政府宏观调控的理由之一,对市场失灵的否定铲除了不恰当宏观调控的理论基础,它要求政府的宏观调控应遵循市场效率原则.     

Determinants of Land Use in Amazônia: A Fine-Scale Spatial Analysis

Wetter areas of the Amazon basin exhibit lower rates of agricultural conversion. Previous analyses, using relatively aggregate data on land cover, have been unable to determine the extent to which this reflects limited access versus unfavorable agroclimatic conditions. This article uses census-tract level data for the Brazilian Amazon to relate forest conversion and pasture productivity to precipitation, soil quality, infrastructure and market access, proximity to past conversion, and protection status. The probability that land is used for agriculture or intensively stocked with cattle declines markedly with increasing rainfall, other things equal.     

The Power of Networks: Integration and Financial Cooperative Performance

Abstract ** :  The purpose of this paper is to perform a cross‐country survey of the level of integration of systems of financial cooperatives (FC) and its effect on measures of performance. We develop a classification scheme based on a theoretical framework that builds on published work using transaction cost economics (TCE) to explain integration of large numbers of financial cooperatives into networks. We identify three critical levels of increasing integration we call respectively atomized systems, consensual networks and strategic networks. Further, we test some of the propositions that result from the theoretical framework on an international sample of financial cooperative systems. Based on this analysis we can conclude that: (i) Integration is less (more) important in developing (more developed) countries and for very small (large) financial cooperatives as a determinant of efficiency. However, integration tends to reduce volatility of efficiency and performance regardless of development. (ii) Integration appears to help control measure of managers' expense preferences that tend to affect performance of FC. (iii) Despite high costs of running hub‐like organizations in highly integrated system, these systems economize in bounded rationality and operate at lower costs than less integrated systems.     

REFRIGERATION AND DISTRIBUTION: NEW ZEALAND LAND PRICES AND REAL WAGES 1873–1939

The responses in New Zealand to the opportunities of refrigeration transformed farming in the Dominion during the half-century from 1890. Closer settlement and the extension of the cultivated area combined with more intensive farming methods to increase land productivity and real gross domestic product capita to the extent that living standards in New Zealand measured by the Human Development Index ranked first in the world by 1913. In contrast, real wages in the Dominion stagnated. The refrigeration-related trade boom had powerful income distribution effects that increased sharply the land rental–wage ratio during the years to 1920. Widely diffuse land ownership in New Zealand tempered the rise in income inequality, to set the Dominion apart from other land-abundant economies of the periphery.