面向802.11b/g应用的RF功放性能优化新一代RF功放积极应对WiFi的性能挑战

随着商业和家庭应用市场范围的不断扩大，802．11无线局域网(WLAN)的市场(业界称之为WiFi)出现了快速增长的局面。根据Strategy Analytics公布的数据，WLAN芯片的市场有望在2004年达到7．57亿美元，器件出货量年度增长32％。     

MIXED-STOCK VS. TERMINAL FISHERIES: A BIOECONOMIC MODEL

ABSTRACT. This paper develops a bioeconomic model of a fishery conducted on several stocks, a large stock capable of supporting a commercial fishery, and one or more smaller stocks which could be driven to extinction at harvest rates that the larger stock can sustain. The model permits a shifting of effort from a mixed-stock fishery to single-stock fisheries. Such a shift could save the weaker stocks from extinction, but the model highlights economic incentives to reject this option. This points to a fundamental conflict between the preservation of biodiversity and economic pressures to maximize profits. This fundamental conflict has in turn important consequences in current debates over the restructuring of major fisheries including those directed at Pacific salmon.