Embedding specific signatures in transmitted signals for identifying common control channels of cognitive radio are addressed in research laboratories because availability of the spectrum occupied by the common contro...Embedding specific signatures in transmitted signals for identifying common control channels of cognitive radio are addressed in research laboratories because availability of the spectrum occupied by the common control channel might change in time. A novel solution to embed a unique cyclostationary signature for the common control channel of cognitive radio is proposed in this article. Based on linear periodically time-variant transformation （LPTV） model, the cyclic autocorrelation expression of the proposed signature is derived, which characterizes its cyclostationarity. Analysis of the cyclostationary signature is presented considering effects of additive white Gaussian noise （AWGN） and multiplath channels. Simulation results illustrating the reliability of signatures are given.展开更多
A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain（ OPFC） diesel engine＇s common rail system is presented as a result of the study of the loop-shaping theory. A common rail ...A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain（ OPFC） diesel engine＇s common rail system is presented as a result of the study of the loop-shaping theory. A common rail working process and the classical frequency control theory are combined to construct a frequency restriction of common rail pressure. A frequency compensator is utilized to improve the robustness of multiplicative perturbations and disturbance. The loop-shaping method has been applied to design the common rail pressure controller of the OPFC diesel engine. Simulation and bench test results show that in the condition of perturbation that comes from the effect of injection,multi-injection,fuel pumping of a pre-cylinder,and instantaneous pressure fluctuation,the controller indicates high precision. Compared with the original controller,this method improves the control precision by 67. 3%.展开更多
For a linear dynamical system,we address the problem of devising a bounded feedback control,which brings the system to the origin in finite time.The construction is based on the notion of a common Lyapunov function.It...For a linear dynamical system,we address the problem of devising a bounded feedback control,which brings the system to the origin in finite time.The construction is based on the notion of a common Lyapunov function.It is shown that the constructed control remains effective in the presence of small perturbations.展开更多
马铃薯疮痂病(potato common scab)近年来在我国主要产区广泛发生,造成严重危害,且缺乏绿色高效的防治措施。为筛选对疮痂病具有显著拮抗效果的生防菌株,本研究以疮痂链霉菌Streptomyces scabies为靶标,筛选到一株拮抗效果显著的生防菌...马铃薯疮痂病(potato common scab)近年来在我国主要产区广泛发生,造成严重危害,且缺乏绿色高效的防治措施。为筛选对疮痂病具有显著拮抗效果的生防菌株,本研究以疮痂链霉菌Streptomyces scabies为靶标,筛选到一株拮抗效果显著的生防菌株ZF517。通过形态学观察、生理生化特性测定以及多基因系统发育树分析,鉴定该菌株为枯草芽胞杆菌Bacillus subtilis。抑菌谱分析显示,菌株ZF517对6种病原真菌和3种病原细菌具有较高的拮抗效果。生防性状检测表明,ZF517能产生蛋白酶和嗜铁素,并含有Surfactin、Macrolactin、Fengycin、Difficidin、Bacillibactin、Bacillaene、Bacilysin和Iturin的合成基因。此外,ZF517的发酵液可抑制疮痂链霉菌菌丝的生长。经萝卜幼苗法验证,ZF517发酵液可显著抑制疮痂链霉菌对萝卜幼苗的侵染,其防效达到63.94%;盆栽试验结果表明,其对马铃薯疮痂病的防效达58.07%,显著优于对照药剂20%噻唑锌悬浮剂的防治效果。综上,菌株ZF517在防治马铃薯疮痂病方面表现出较大的生防潜力。展开更多
基金supported by Nokia Device R&D China,the National Basic Research Program of China(2007CB310602)
文摘Embedding specific signatures in transmitted signals for identifying common control channels of cognitive radio are addressed in research laboratories because availability of the spectrum occupied by the common control channel might change in time. A novel solution to embed a unique cyclostationary signature for the common control channel of cognitive radio is proposed in this article. Based on linear periodically time-variant transformation （LPTV） model, the cyclic autocorrelation expression of the proposed signature is derived, which characterizes its cyclostationarity. Analysis of the cyclostationary signature is presented considering effects of additive white Gaussian noise （AWGN） and multiplath channels. Simulation results illustrating the reliability of signatures are given.
基金Supported by the National Natural Science Foundation of China(51406013)
文摘A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain（ OPFC） diesel engine＇s common rail system is presented as a result of the study of the loop-shaping theory. A common rail working process and the classical frequency control theory are combined to construct a frequency restriction of common rail pressure. A frequency compensator is utilized to improve the robustness of multiplicative perturbations and disturbance. The loop-shaping method has been applied to design the common rail pressure controller of the OPFC diesel engine. Simulation and bench test results show that in the condition of perturbation that comes from the effect of injection,multi-injection,fuel pumping of a pre-cylinder,and instantaneous pressure fluctuation,the controller indicates high precision. Compared with the original controller,this method improves the control precision by 67. 3%.
基金supported by Russian Foundation for Basic Research(Grant No.08-01-00234,08-01-00411,08-08- 00292)
文摘For a linear dynamical system,we address the problem of devising a bounded feedback control,which brings the system to the origin in finite time.The construction is based on the notion of a common Lyapunov function.It is shown that the constructed control remains effective in the presence of small perturbations.
文摘马铃薯疮痂病(potato common scab)近年来在我国主要产区广泛发生,造成严重危害,且缺乏绿色高效的防治措施。为筛选对疮痂病具有显著拮抗效果的生防菌株,本研究以疮痂链霉菌Streptomyces scabies为靶标,筛选到一株拮抗效果显著的生防菌株ZF517。通过形态学观察、生理生化特性测定以及多基因系统发育树分析,鉴定该菌株为枯草芽胞杆菌Bacillus subtilis。抑菌谱分析显示,菌株ZF517对6种病原真菌和3种病原细菌具有较高的拮抗效果。生防性状检测表明,ZF517能产生蛋白酶和嗜铁素,并含有Surfactin、Macrolactin、Fengycin、Difficidin、Bacillibactin、Bacillaene、Bacilysin和Iturin的合成基因。此外,ZF517的发酵液可抑制疮痂链霉菌菌丝的生长。经萝卜幼苗法验证,ZF517发酵液可显著抑制疮痂链霉菌对萝卜幼苗的侵染,其防效达到63.94%;盆栽试验结果表明,其对马铃薯疮痂病的防效达58.07%,显著优于对照药剂20%噻唑锌悬浮剂的防治效果。综上,菌株ZF517在防治马铃薯疮痂病方面表现出较大的生防潜力。
