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In this paper, a bulk micro machined lateral-axis TFG (tuning fork gyroscope) with improved architecture and combined mechanism sensing capacitors is reported. The combined sensing capacitors make the TFG have high sensitivity and good linearity even under wide input range and fabrication imperfection. Moreover, the decoupled comb drive, together with the improved architecture, can efficiently decouple...
A micro-acceleration latching switch with barb latching mechanism is presented in this paper. The latching mechanism which likes a “barb” can make the switch latch reliably. What's more, the flexible contacts can prevent the switch from opening due to impact resulting from the rebound or vibration of proof mass when the switch is latched. The stops which limit displacement will also improve the reliability...
The aim is to give rise to the teacher's attention by introducing some examples programmed using MATLAB which have arouse the students efficiency and enthusiasm in the courses of vibration theory, and if teachers want to improve the level of teaching and learning effectiveness. These examples are based on some real model or question that can enhance student's communication, critical thinking, teamwork,...
Extraction of vegetation water content and soil moisture from microwave observations requires development of a high fidelity scattering model. A number of factors associated with the vegetation canopy and with the underlying bare soil should be taken into account. In this paper, we propose an electromagnetic scattering model for a corn canopy which includes the coherent effect due to the corn structure...
Based on Gurson's model, analysis of finite deform plastically damage for specimen has been analyzed in powder metallurgy alloys including void. Special attentions have been paid on the influence of the location and shape as well as size of the void on the void nucleation, enlargement and stress redistributing. It has been found that the influence is quite obvious. It can be concluded that the life...
A technique for the fabrication of planar silicon nanowires (SiNWs) on SIMOX-SOI (Separation by Implanted Oxygen-Silicon on Insulator) wafers using sidewall transfer lithography is presented, which can be used as field effect devices for biomolecular detections. Different from the existing synthesis process, this method is based on standard “top-down” semiconductor process. Aluminum sidewall is applied...
A novel single mask dry releasing process for making high aspect ratio SOI MEMS devices is presented. The proposed process takes advantage of lag effect in DRIE. The basic idea is that the buried oxide layer is completely removed using the wide trench and releasing holes defined in the first DRIE, then the second DRIE is carried out to released the narrow trenches. Not only stiction problem is avoided,...
As the most important equipment in substation, it is necessary to make power transformer intelligence firstly in smart grids construction. According to the basic specifications of intelligent machine, i.e., visualization condition, networking control and automation, this paper presents the overall framework of a developed intelligent system for an 110kV power transformer. The structural function definition,...
The electrostatic negative-stiffness behavior of vertical structures under out-of-plane motion decreases the resonant frequency and deteriorates the linearity of a lateral-axis tuning-fork gyroscope (TFG). An electrostatically isolated silicon island is proposed to suppress this behavior. The negative-stiffness behavior is observed and the effectiveness of the electrostatic isolation is experimentally...
A kind of system architecture based on multi-agent is proposed in this paper for autonomous control system of an autonomous underwater vehicle (AUV). The autonomous control system is divided into several agents according to its software function and hardware structure. Each agent is designed as a deliberative/act hybrid mode. The agent not only recognizes science events and makes decision unattached,...
We present an improved procedure for extracting parasitic capacitance parameters and gate current parameters for MOSVAR, the industry standard MOS varactormodel. Our technique is verified against measured data from three technology nodes (180 nm, 130 nm and 65 nm), and is also used to validate the MOSVAR P-gate/P-well tunneling current sub-model.
A stable red, green and blue output was obtained by frequency doubling and tripling an alternate resonant dual-wavelength Q-switched Nd:YAG laser with an optical superlattice in a LiTaO3 crystal as a frequency converter.
This paper presents an adaptive clustering algorithm based on power system network topology, initial power flow and given architecture. The sizes of the small cliques are derived using multi-constraint and multi-objective graph partitioning theory. The vertices of the graph represent units of computation, and the edges encode data dependencies. Tests for a 39-bus network, a 1056-bus network, a 3872-bus...
A stable red, green and blue output was obtained by frequency doubling and tripling an alternate resonant dual-wavelength Q-switched Nd:YAG laser with an optical superlattice in a LiTaO3 crystal as a frequency converter.
A physically based scalable model for MOS Varactors is presented. The model includes a PSP-based analytical surface potential charge formulation, MOS varactor specific gate current models, and physical geometry and process parameter based parasitic modeling. Key device performances of capacitance and quality factor Q are validated over voltage, frequency, and geometry, for several technologies. The...
Transformer deficiencies usually take many years to gestate before developing into a problem or failure. Thus the loss induced by problems or failures could be decreased if they are diagnosed earlier and a maintenance action is adopted duly. Many methods had been developed to finish this purpose, but the diagnosis results were still unsatisfied. In this paper, a case-based reasoning method is utilized...
In this paper, we first propose a turbo-sum-product (TSP) decoding algorithm for quasi-cyclic (QC) low-density parity-check (LDPC) codes and show that our proposed algorithm not only achieves faster convergence and better error performances than the sum-product (SP) algorithm, but also needs less memory in implementation. Compared with the turbo decoding algorithm, our TSP algorithm saves the same...
Based on the development of new sensors, optical fibre, communication and computer technology, not only the improvement of traditional testing method but also the development of new monitoring methods and systems are realized step by step. And introduction of statistics and more combined artificial intelligence algorithms, more correct and detailed faults may be diagnosed timely based on all sorts...
The development of an arc prolongation device for the secondary impulse method used in power cable fault location is reported in this paper. The faulty cable breaks down by a HV surge. Prior to the arc extinguishing, the device will supply, automatically, the energy to the faulty cable to sustain the arc sufficiently for the secondary impulse test. The device consists of an energy generator, wave...
One of the methods currently being investigated as a possible non-intrusive diagnostic tool for condition monitoring of the oil-paper insulation of power transformer is the return voltage measurement (RVM). Using RVM improves the ability to detect the content of water concentration and the ageing process in the oil-paper insulation system and can thus be an indicator of insulation quality and the...
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