The Diagnosis of the Ancient Trees of Ficus microcarpa

通过对鼓浪屿古榕树的普查,选择其健康诊断的生长指标和生理指标,包括当年生枝叶、果实生长状况、叶绿素荧光等,对不同生长势的古榕树进行分析,旨在探讨基于生长指标与生理指标相结合的古榕树的健康诊断方法,为古榕树的养护与复壮提供依据。结果表明,生长指标与生理指标能较一致地指示古榕树的健康状况。因此,可通过生长指标与生理指标相结合的方法诊断古榕树的健康状况。Based on the general investigation and analysis of the ancient trees of Ficus microcarpa at Gulangyu by use of the growth indices and the physiological indices,such as the growth status of annual branches,leaves and fruits and the chlorophyll fluorescence,the diagnosis of the ancient trees of Ficus microcarpa with different growth vigor was discussed to provide evidence for their maintenance and rejuvenation.The results indicated that the growth indices and the physiological indices could consistently instruct the health status of the ancient trees of Ficus microcarpa.Thus the diagnosis by the combination of the growth indices and the physiological indices could be applied to the ancient trees of Ficus microcarpa.鼓浪屿万石山国家级风景名胜区科技项目资助(GW2008

西北太平洋黑潮路径变化与柔鱼CPUE的关系研究

利用西北太平洋长时间序列SST、黑潮路径、柔鱼渔获量数据 ,基于GIS技术分析了黑潮路径类型变化和离岸摆动及其对柔鱼CPUE的影响。分析结果表明 ,1 990— 2 0 0 3年 ,黑潮弯曲发生的月份数占 82 % ,其中整月发生弯曲的月份数占 47% ,共发生 2次大弯曲、2次准弯曲、5次小弯曲。柔鱼年CPUE ,在黑潮发生准弯曲年份最高 ,黑潮发生小弯曲年份较高 ,黑潮发生大弯曲年份和平直年份较低 ,黑潮大弯曲发生的强盛年份最低。柔鱼月CPUE高值时段 ,多是黑潮发生弯曲时段 ,且主要是C型弯曲。连续 3月以上出现月CPUE高值段 ,黑潮路径模式是C型弯曲和平直路径交替出现。 3天CPUE的高值时段 ,黑潮弯曲型的频次远高于平直型 ;较高值时段 ,黑潮弯曲型的频次稍高于平直型 ;中值时段 ,黑潮平直型频次稍高于弯曲型 ;较低值时段 ,黑潮平直型高于弯曲型 ;低值时段 ,黑潮平直型远高于弯曲型

Role Switching Techniques for Improving Throughput over Bluetooth Wireless Networks

[[abstract]]In Bluetooth radio system, a piconet consists of a master and at most 7 active slaves. A device that simultaneously participates more than one piconet is called relay. By sharing common relays, two or more piconets can construct a bigger connected network, called scatternet, providing the multi-hop services over Bluetooth networks. This paper presents distributed role switch techniques to dynamically swap the role of two devices. By adopting the role switching operations, the unnecessary relay and piconet can be dynamically removed so that the packet error rate could be improved, the guard slots could be saved, and the average routing length could be reduced. The proposed protocol is expected to improve the performance of data transmission for Bluetooth scatternet