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For an unmanned marine vehicles, the calculations of its resistance under the water and hydrodynamic coefficients are necessary and important work. For the complexity of the fluid around autonomous underwater vehicles(AUV), the kinematic and dynamic model of underwater vehicles are highly nonlinear and coupled so that the hydrodynamic performance are hardly to be obtained. With the help of computational...
A novel kind of bend resistant large mode area fiber is proposed. With the introduce of a multi-layer core, this kind of fiber breaks the mode field area limitation for multi-trench fiber, and achieves a mode filed area of 1300 μm2 at a bend radius of 15cm.
A bend-resistant large mode area fiber with combination structure of multi-trench and leakage channel is proposed. In terms of the practical requirement for active fibers, the core region is designed with a higher refractive index than the pure silica, which allows the core to be highly doped with gain medium. In the meantime, a ring of high-index rods are introduced to work as the resonant ring,...
For the aerodynamic parameters identification of projectile and rocket under the influence of random wind, based on the control system sensitivity theory, the formation of the sensitivity and related mathematical models according to realistic systems are formulated. Sensitivity principle of the control system theory is applied to the identification of resistance coefficient. Analyzing missile system...
In this paper, a micro vacuum pirani gauge made of single crystal silicon has been developed and its temperature and DC current response properties in different pressures were firstly studied detailedly. The resistance of it increases with the temperature exponentially. There is a current threshold resulting from the materials characteristics and the precision of the instrument at low pressure. And...
The structure, working principle and fabrication of a humidity sensor based on carbon nanotubes (CNTs) were presented. The sensor resistance was sensitive to humidity. Schrödinger equation associated to the potential barrier between two CNTs was set up and solved. The analysis results indicated that the fluctuation of sensor resistance was caused by instability of CNTs, and the testing frequencies...
It's very important to find an efficient method of secret key management to guarantee secure communication in wireless sensor networks. In this paper, a cluster-based dynamic secret key management scheme has been proposed. A pairwise key has been established through OR and XOR operations in this scheme since its low energy and limited memory space of a sensor node. These OR and XOR operations not...
In this paper, a very simple micro vacuum pirani gauge made of single crystal silicon is presented. It was fabricated by standard bulk micromachining with only three masks. The high aspect ratio structure of the pirani gauge has large efficient gaseous heat transfer area, thus can increase the sensitivity of the pirani gauge. The dynamic range of the pirani gauge is 2 Pa to 400 Pa which should be...
The thermoelectric characterization of MOS-based resistance arrays has been studied, including the resistance array unit and the structure of resistance arrays. The MOS resistance arrays infrared image nonuniformity was explored. A novel method based on thermal image realtime compensation has been developed, which was used to temperature infrared detector units. Arrays with 64times64 units and primary...
The fretting characteristic of four kinds of gold-plating product has been considered and discussed in this paper. On the basis of a series of fretting experiments and investigated the reason of the low contact resistance which is lower than the failure criteria (Antler, 1985) was developed. A new method to compare the fretting characteristics of gold-plating product was proposed also.
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