7 hymenopterous species have been confirmed by the present study as parasites of Liriomyza sativat in the Nanchang area. These parasites will also porasitize the pea leaf-miner, Phytomyza horticola,except Chrysonotomy...7 hymenopterous species have been confirmed by the present study as parasites of Liriomyza sativat in the Nanchang area. These parasites will also porasitize the pea leaf-miner, Phytomyza horticola,except Chrysonotomyia okazakii and Hemiptarsenus varicornis. All of them are larval or larval -pupal purasites and no egg parasite and no egg parasite and pupal parasite has been reared. Opius sp. Diglyphus isaea, Chrysocharis pentheus are the dominant species among the parasites of the Liriomyza sativae as well as the pea leaf-miner in Nanchang area, but there is no effective parasite complex to control Liriomyza sativae as pea leaf miner. The climate and foods are very appropriate to arise the number of Liriomyza sativae in May to Oseptember. According to the investigation in the field, the Liviomyza sativae and its plant of alternative host never find out in winter, in Nanchang area.展开更多
This paper focuses on the influence of the disturbance rejection rate(DRR)and parasitic loop parameters on the stability domain of the roll-pitch seeker's guidance system.The DRR models of the roll-pitch seeker ca...This paper focuses on the influence of the disturbance rejection rate(DRR)and parasitic loop parameters on the stability domain of the roll-pitch seeker's guidance system.The DRR models of the roll-pitch seeker caused by different types of disturbance torques and the scale deviation of different sensors are established.The optimal DRR model of the roll-pitch seeker,which contains the scale deviation model,is proposed by formula derivation.The model of the roll-pitch seeker's guidance system is established and equivalently simplified by the dimensionless method.The Lyapunov stability criterion for stability analysis of the guidance system is given by means of the passivity theorem and related definitions and lemmas.A simplified model of the roll-pitch seeker's guidance system,which is suitable for the Lyapunov stability criterion,is established by formula derivation and equivalent transformation.Three conditions that satisfy the Lyapunov stability criterion are obtained.Mathematical simulation with Nyquist plots is used to analyze the influence of different DRR parameters on the stability domain of the roll-pitch seeker's guidance system.Simulation results of this paper can provide reference for the stability analysis of systems related to the roll-pitch seeker.展开更多
文摘7 hymenopterous species have been confirmed by the present study as parasites of Liriomyza sativat in the Nanchang area. These parasites will also porasitize the pea leaf-miner, Phytomyza horticola,except Chrysonotomyia okazakii and Hemiptarsenus varicornis. All of them are larval or larval -pupal purasites and no egg parasite and no egg parasite and pupal parasite has been reared. Opius sp. Diglyphus isaea, Chrysocharis pentheus are the dominant species among the parasites of the Liriomyza sativae as well as the pea leaf-miner in Nanchang area, but there is no effective parasite complex to control Liriomyza sativae as pea leaf miner. The climate and foods are very appropriate to arise the number of Liriomyza sativae in May to Oseptember. According to the investigation in the field, the Liviomyza sativae and its plant of alternative host never find out in winter, in Nanchang area.
基金supported by the Defense Science and Technology Key Laboratory Fund of Luoyang Electro-optical Equipment Institute,Aviation Industry Corporation of China(6142504200108)。
文摘This paper focuses on the influence of the disturbance rejection rate(DRR)and parasitic loop parameters on the stability domain of the roll-pitch seeker's guidance system.The DRR models of the roll-pitch seeker caused by different types of disturbance torques and the scale deviation of different sensors are established.The optimal DRR model of the roll-pitch seeker,which contains the scale deviation model,is proposed by formula derivation.The model of the roll-pitch seeker's guidance system is established and equivalently simplified by the dimensionless method.The Lyapunov stability criterion for stability analysis of the guidance system is given by means of the passivity theorem and related definitions and lemmas.A simplified model of the roll-pitch seeker's guidance system,which is suitable for the Lyapunov stability criterion,is established by formula derivation and equivalent transformation.Three conditions that satisfy the Lyapunov stability criterion are obtained.Mathematical simulation with Nyquist plots is used to analyze the influence of different DRR parameters on the stability domain of the roll-pitch seeker's guidance system.Simulation results of this paper can provide reference for the stability analysis of systems related to the roll-pitch seeker.
