Samples of pheromone lures used in boll weevil, Anthonomus grandis （Boheman）, eradication programs are routinely analyzed by Gas Chromatography （GC） to ensure lures are adequately dosed with grandlure, the synthet...Samples of pheromone lures used in boll weevil, Anthonomus grandis （Boheman）, eradication programs are routinely analyzed by Gas Chromatography （GC） to ensure lures are adequately dosed with grandlure, the synthetic aggregation phero- mone produced by male weevils. However, preparation of GC samples is tedious, time consuming, and requires a moderate level of experience. We examined the use of a commercially-available electronic nose （e-nose） for rapidly assessing the grandlure contents of lures. The e-nose was trained to recognize headspace collections of grandlure emitted from new lures and after lures were aged under field conditions for 4 d, 7 d, 10 d, and 14 d. Based on cross-validation of the training set, the e-nose was 82% accurate in discriminating among the different age classes of lures. Upon sampling headspace collections of pheromone from a different set of field-aged lures, the e-nose was 〈50% accurate in discriminating 4 d, 7 d, and 10 d aged lures from the other age classes of lures. However, the e-nose identified new and 14 d aged lure samples with 100% accuracy. In light of these findings, e-nose technology shows considerable promise as an alternative approach for rapidly assessing the initial grandlure contents of lures used in boll weevil eradication programs.展开更多
The motion of a lure in water is investigated experimentally and numerically.The lure motion in water of apassing water tank is observed,and the periodic motion is found.From the Fourier analysis,it is found that the ...The motion of a lure in water is investigated experimentally and numerically.The lure motion in water of apassing water tank is observed,and the periodic motion is found.From the Fourier analysis,it is found that the frequency with the largest amplitude in the lateral direction depends on the lip width of the lure.To understand the lure dynamics,a numerical simulation of the flow field around the lure is performed.The shape is measured using an X-ray computer tomography and converted into a voxel model.From visualization,it is found that vortex sheds from its lip correspond to the vibration frequency of the lure.展开更多
In this paper, we transform n-th order Lure direct control systems into nonlinear systems with separating variables, and induce a concept for absolute stability of part arguments. The necessary and sufficient conditio...In this paper, we transform n-th order Lure direct control systems into nonlinear systems with separating variables, and induce a concept for absolute stability of part arguments. The necessary and sufficient conditions (NASC) for the absolute stability of Lure direct control systems are given and some sufficient conditions are obtained展开更多
[Objective]The paper was to compare trapping efficacy of two types of new sex lures for Athetis lepigone（Moschler）in fields.[Method]The trapping performance of two lures for A.lepigone was tested in Hongdong County ...[Objective]The paper was to compare trapping efficacy of two types of new sex lures for Athetis lepigone（Moschler）in fields.[Method]The trapping performance of two lures for A.lepigone was tested in Hongdong County of Shanxi Province of China from June 21 to August 20 in 2012.[Result]The average number of moths trapped by lure B was 2.49 times of that trapped by lure A during June 21and August 17,and the difference was significant.The maximum number of A.lepigone moth trapped by lure B at one basin within a single day reached 280,while that trapped by lure A was only 85.The validity of two lures in fields reached 58 d,basically consistent with seasonal dynamics of A.lepigone moth trapped by lures.[Conclusion]Lure B is of higher quality and could be recommended to apply in dynamic monitoring and trapping control against A.lepigone adults.展开更多
According to New York Times on November 19, as retailers battle to draw customers into their stores on Black Friday, online merchants are plotting a cunning ambush, offering an arsenal of mobile-only deals intended to...According to New York Times on November 19, as retailers battle to draw customers into their stores on Black Friday, online merchants are plotting a cunning ambush, offering an arsenal of mobile-only deals intended to pick off shoppers as they wait in line. The Gilt Groupe, for example, which展开更多
文摘Samples of pheromone lures used in boll weevil, Anthonomus grandis （Boheman）, eradication programs are routinely analyzed by Gas Chromatography （GC） to ensure lures are adequately dosed with grandlure, the synthetic aggregation phero- mone produced by male weevils. However, preparation of GC samples is tedious, time consuming, and requires a moderate level of experience. We examined the use of a commercially-available electronic nose （e-nose） for rapidly assessing the grandlure contents of lures. The e-nose was trained to recognize headspace collections of grandlure emitted from new lures and after lures were aged under field conditions for 4 d, 7 d, 10 d, and 14 d. Based on cross-validation of the training set, the e-nose was 82% accurate in discriminating among the different age classes of lures. Upon sampling headspace collections of pheromone from a different set of field-aged lures, the e-nose was 〈50% accurate in discriminating 4 d, 7 d, and 10 d aged lures from the other age classes of lures. However, the e-nose identified new and 14 d aged lure samples with 100% accuracy. In light of these findings, e-nose technology shows considerable promise as an alternative approach for rapidly assessing the initial grandlure contents of lures used in boll weevil eradication programs.
基金supported in part by Tokyo Denki University Science Promotion Fund(Q12K-04)
文摘The motion of a lure in water is investigated experimentally and numerically.The lure motion in water of apassing water tank is observed,and the periodic motion is found.From the Fourier analysis,it is found that the frequency with the largest amplitude in the lateral direction depends on the lip width of the lure.To understand the lure dynamics,a numerical simulation of the flow field around the lure is performed.The shape is measured using an X-ray computer tomography and converted into a voxel model.From visualization,it is found that vortex sheds from its lip correspond to the vibration frequency of the lure.
基金Project supported by the National Natural Science Foundation of China.
文摘In this paper, we transform n-th order Lure direct control systems into nonlinear systems with separating variables, and induce a concept for absolute stability of part arguments. The necessary and sufficient conditions (NASC) for the absolute stability of Lure direct control systems are given and some sufficient conditions are obtained
基金Supported by Special Fund for Agro-scientific Research in the Public Interest "Research and Demonstration of Comprehensive Prevention and Control Technology for Borers in Northern Fruit Trees"(201103024)
文摘[Objective]The paper was to compare trapping efficacy of two types of new sex lures for Athetis lepigone（Moschler）in fields.[Method]The trapping performance of two lures for A.lepigone was tested in Hongdong County of Shanxi Province of China from June 21 to August 20 in 2012.[Result]The average number of moths trapped by lure B was 2.49 times of that trapped by lure A during June 21and August 17,and the difference was significant.The maximum number of A.lepigone moth trapped by lure B at one basin within a single day reached 280,while that trapped by lure A was only 85.The validity of two lures in fields reached 58 d,basically consistent with seasonal dynamics of A.lepigone moth trapped by lures.[Conclusion]Lure B is of higher quality and could be recommended to apply in dynamic monitoring and trapping control against A.lepigone adults.
文摘According to New York Times on November 19, as retailers battle to draw customers into their stores on Black Friday, online merchants are plotting a cunning ambush, offering an arsenal of mobile-only deals intended to pick off shoppers as they wait in line. The Gilt Groupe, for example, which
