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The coverage is a critical issue in WSNs and considered as a measure of the service quality of WSNs. We proposed a coverage optimal algorithm based on Virtual Distance (VD) to enhance the coverage of WSNs after initial random placement. We define the ideal position of node related to its neighbor, and then the distance vector of one node's real position to ideal position is defined as virtual distance...
Ferroelectric-semiconductor coupling solar cell is a novel concept of photovoltaic device, with nano piezoelectric particles embedded in light-absorbing semiconductors. In this work, we successfully realized such devices with S-rich CdSTe nano particles of hexagonal phase with wurtzite structure embedded in Te-rich CdSTe film of cubic phase with zinc blend structure through a high temperature phase...
since the concept of inter-organization imitation was brought up, researchers mainly use a theory to explain the imitation behavior of internationalization of service multinational corporations, which is not enough to interpret the generating mechanism. Actually, because of the multi-reasons of the imitation of internationalization, it is not suitable to explain the phenomenon in one specific aspect...
The necessity of developing an automatic high performance exertion system for the type approval test of tank GCS is expounded. The composition and working principle of exertion system are introduced. Studies on exertion security and non-overshot exertion control performance are carried on using simulator and simulation methods, which draw the conclusion that control method using shift and force bi-closed-loop...
During the test of tank gun control system for type approval, external force is exerted on the gun barrel to measure a specific parameter. The architecture and working principle of exertion system are introduced, analytical calculation of the influence of force point transition on exertion precision is emphasized, the influence of exertion plane's smoothness on exertion precision is studied using...
With the development of technology, the more sensor and actuator are used on the building structure control, the more fault probability will become. This study introduces hierarchical decentralized fault tolerate controller design methods, which are constructed for sensor and actuator failures, based on Lyapunov approach. And it constructs cantilever active control experiments by Matlab/xPC control...
McPherson Suspension is researched with multi-body dynamics and Suspension Kinematics theory. When the front rubber bushing stiffness of lower control arm is changed, the suspension performance is analyzed and discussed in the vertical bounce, roll bounce, brake force and drive force. The conclusion is drawn that stiffness of front rubber bushing in all directions has no effect on the suspension performance...
A universal improved nonlinear longitudinal model of hypersonic developed by Langley lab is adopted. For the I/O linearizing model, a sliding mode controller is designed. This method can solve the uncertainty problem and insensitive to disturbance of outside. The index approach law used to drive the sliding mode to reach the sliding surface is adopted to eliminate the quiver. The simulation for tracking...
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