And the naturally control action has been analysised. the Results are as follow:the parasitic rate of larvae, pupae and adults is 5.41%, 8.46% and 0.33%.
the selection effect of DsCPV on different instars of D. punctatus, the effect of DsCPV on D. punctatus under different temperature, the control action of different dosages of DsCPV on the host population in field, the epizootic dynamics of virus disease in field, and the influence of different concentrations of DsCPV on the parasitism nature enemy of the pupa of D.
Integrated management had better control effects which reached 69.5%~81.5%,especially the integrated management by clearing the disease shoot,root application of B fertilizer and carebendazin had control effect reaching 81.5%.
The control function of spider is the largest on the population number of Spodoptera litura , and indexes of population control are 12.83 and 9.06, disease and natural death are secondly, IPCs are 4.54 and 6.33.
Therefore,in the formation of counter-measures for pest management for paddy fields,rice strains should be taken as the key link and full use should be made of the controlling effect of the natrural enemies,resistant crop strains and living surroundings over the local dominant pests so as to successfully develop the key control techniques and form the regional EPM models.
The error of attaining the aim of control was shown to be proportional to that of defining the initial system state and the error of realization of the control action.
The problem of designing an adaptive control system with reference models of local subsystems was solved for the case where only the controlled variable and the scalar control action are measurable.
It was demonstrated that the error in achieving the goal of control is proportionate to the error in prescribing the initial state of system and the error in realizing the control action.
Explicit asymptotic formulas for the reachable sets of linear dynamical systems with constraints on the total impulse of control action under different assumptions concerning the spectrum of the system's matrix are obtained.
The control effect of central-slotting depends on the aerodynamic configuration of the original girder section and the corresponding central-slotting width.
The activities of enzymes responsible for lignification in pepper, pre-inoculation with arbuscular mycorrhizal (AM) fungus ofGlomus intraradices and/or infection with pathogenic strain ofPhytophthora capsici, and the biological control effect ofG.
An algorithm is proposed for constructing a control function that transfers a wide class of nonlinear systems of ordinary differential equations from an initial state to an arbitrarily small neighborhood of a given terminal state.
A necessary and sufficient condition for approximate controllability via Lp ([0, T], U), 1?p>amp;lt;∞ is obtained, where Lp ([O, T], U) is the control function space.
The results show that the particle size and distribution can be changed by varying the preparation conditions, and the size of the microemulsion droplets has a controlling effect on the size of the particles.