为筛选出高效、安全防治温室烟粉虱的药剂及减少化学农药使用,以设施苗期番茄为试验材料,设置4个处理,分别为1.25、1.67、2.08 m L/kg的5%d-柠檬烯SL,0.17 m L/kg 25%噻虫嗪WP(常规使用的化学药剂),以清水为空白对照。结果显示:1.67 m L...为筛选出高效、安全防治温室烟粉虱的药剂及减少化学农药使用,以设施苗期番茄为试验材料,设置4个处理,分别为1.25、1.67、2.08 m L/kg的5%d-柠檬烯SL,0.17 m L/kg 25%噻虫嗪WP(常规使用的化学药剂),以清水为空白对照。结果显示:1.67 m L/kg 5%d-柠檬烯SL对烟粉虱防治效果较好,适宜推广使用。展开更多
A traffic sensitive spectrum access scheme is proposed to satisfy the traffic load requirement of secondary users(SUs).In the proposed design,SU only accesses available channels which can meet the traffic demand.To ac...A traffic sensitive spectrum access scheme is proposed to satisfy the traffic load requirement of secondary users(SUs).In the proposed design,SU only accesses available channels which can meet the traffic demand.To achieve this,the expected transmission time(ETT) of the SU is calculated first based on the delivery ratio.Then,the channel idle time is estimated based on the activity of primary users(PUs).Therefore,available channels with estimated idle time longer than ETT could be chosen.With high probability,the SU can finish transmission on these channels without disruption,thereby satisfying the traffic load demand of the SU.Finally,our method is extended to the multi-channel scenario where each SU can access multiple channels simultaneously.Performance analysis shows that our method satisfies the requirement of SUs while effectively improving the throughput.展开更多
文摘为筛选出高效、安全防治温室烟粉虱的药剂及减少化学农药使用,以设施苗期番茄为试验材料,设置4个处理,分别为1.25、1.67、2.08 m L/kg的5%d-柠檬烯SL,0.17 m L/kg 25%噻虫嗪WP(常规使用的化学药剂),以清水为空白对照。结果显示:1.67 m L/kg 5%d-柠檬烯SL对烟粉虱防治效果较好,适宜推广使用。
基金Supported by the National High Technology Research and Development Programme of China(No.2011AA010503)the National Natural Science Foundation of China(No.60903192)
文摘A traffic sensitive spectrum access scheme is proposed to satisfy the traffic load requirement of secondary users(SUs).In the proposed design,SU only accesses available channels which can meet the traffic demand.To achieve this,the expected transmission time(ETT) of the SU is calculated first based on the delivery ratio.Then,the channel idle time is estimated based on the activity of primary users(PUs).Therefore,available channels with estimated idle time longer than ETT could be chosen.With high probability,the SU can finish transmission on these channels without disruption,thereby satisfying the traffic load demand of the SU.Finally,our method is extended to the multi-channel scenario where each SU can access multiple channels simultaneously.Performance analysis shows that our method satisfies the requirement of SUs while effectively improving the throughput.
