Modeling and simulation based on open electrical impedance tomography

In order to improve the error in image reconstruction caused by changeable positions of the electrodes in closed electrical impedance tomography, we propose an open electrical impedance tomography (OEIT) model using fixed electrode array. The problem was approximately assumed to be a virtual field by defining certain local sensitive area instead of solving the boundary problem in the whole electromagnetic field strictly. Modeling and simulation of OEIT have been conducted to define reasonable boundary parameters and electrode array structure. The finite element method is used for forward computation while Newton one step error reconstructor is used for image reconstruction. The target position, area and conductivity change can be reflected by the relative change of the boundary voltage and the reconstructed image is clear. Better resolution and positioning accuracy can be obtained in the shallower surface of the body by OEIT, so it is valuable in clinical applications.     

Analysis of Sewage-water Heat Exchanger withthe Function of Auto-de-fouling

A sewage-water shell-tube heat exchanger with the function of de-fouling was proposed and designed for sewage-source heat pump. Its new simulation program which relies on a distribution parameter computational method was set up. Then the model was solved with the method of Matrix Control. Based on the model, the distribution of bilateral fluid temperature were studied, under the conditions of different flow rates and heat exchange area before and after the de-fouling. Results showed that there will be heat anti-transfer phenomenon if the heat exchanger area is bigger than need and the region of this phenomenon was point out. Setting the function of auto-de-fouling in shell-tube heat exchanger and reducing the equipment's volume accordingly can make the sewage-water heat exchanger run in the best conditions.     

the Autolisp Programming Method Processing the Data of the Function of Mechanical and Electrical Products

This paper has briefly stated the necessit of applying the computer to processing automatically the data of the function of mechanical and electrical products. It has also presented the method which can solve this practical problem. The method is AutoLISP programming design. Besides, It has summarized the features of LISP and A oLISP language and the principles of the AutoLISP programming method. With examples.     

The Diagnostic Model of Cotton Aphids Based on Leaf Textural Features

[Objective] The aim of this research is to explore the possibility of rapid identification of aphid damage to cotton leaves by identifying the hyperspectral image about healthy and aphid damage cotton leaves. [Method] Taking Xinluzao 45 as material, hyperspectral images of healthy and damaged cotton leaves by aphids were obtained, and hyperspectral image information was extracted from interested regions of different cotton samples. Then three descending dimension methods were used to extract hyperspectral feature, and Gray-Level Co-occurrence Matrix to extract image texture feature. Finally a cotton aphids damage diagnostic model was built up. [Result] The prediction accuracy based on all textural samples input Random frog-partial least-square-linear discriminant Function (RF-PLS-LDA) model was 91.49%. The prediction accuracy based on energy data input principal component analysis-loading partial least-square-linear discriminant function (PCA-Loading-PLS-LDA) model was 92.55%. [Conclusion] The second-order statistics (energy) of gray co-occurrence matrix can be used to simplify the model, reduce the computation and improve the stability of prediction. Based on the texture feature vector, the identification of aphid cotton leaves can be realized effectively, which provides a method for the rapid identification of insect pests.     

Present Statue and Future of the In-situ Reaction Synthesis Technology for Metal Matrix Composites Fabricated

Among the methods of fabrication of ceramic particles reinforced Metal Matrix Composites, the in-situ reaction synthesis technology has obvious technical and economical advantages over other traditional methods. The in-situ reactive technology has become the leading direction in composites research area in the past decade. The main in-situ reaction synthesis methods include XD, VLS, SHS, DIMOX, PRIMEX, RSD, CR, MA, etc. The principles, properties and prospective application of the main in-situ reaction synthesis methods are reviewed. The Metal Matrix Composites, prepared by in-situ reaction composite technology, can normally achieve higher mechanical properties than other traditionally prepared composites under the same condition. The in-situ reaction synthesis technology, with its wide raw material resources, low price, relatively simple processes, low cost preparation and application feasibility in large-scale industry process, is of great future.     

A Kind of Adaptive Generalized Predictive Control for a Nonlinear System

This paper,using Hammerstein model to express a kind of nonlinear system,presents a new kind of Adaptive Generalized Predictive control for Nonlinear systems(NAGPC). This method divides the whole system into two parts: linear subsystem and nonlinear one. In the first part,a new algorithm ,whose computation quantity is less and speed is faster,is developed according to the characteristics of gain controlling Matrix F in the Generalized Predictive Control (GPC). Mean while, the interpolation method is used to develop one step root solving procedure and the result can be used as the whole system input in the second part. Simulation studies show that the general algorithm NAGPC is strong in robustness,good in stability and fast in computation.     

Electrical Impedance Technology Applied to Examining Brain Edema

Biological electrical impedance is a physical quantity to reflect electricity character of biological tissue, apparatus, cell or whole organism, which is a kind of new method developed recently to analyze component of body. This technology is unhurt examining method which obtains certain biomedicine information about human body according to electrical character and change of biological tissue or apparatus, has unhurt, cheap, safe, innocuity, operator simple and abundant information etc., is prone to be accepted by doctors and patients. Now unhurt brain electrical impedance double channel examining system and brain electrical impedance topographic mapping system have entered clinical experiment moment, and contactless magnetic induction tomography(CMIT) is taken notice of widely as a more effective examining method.     

Management for Design Iteration

A short Time-to-Market is an important means to win competitive advantage for enterprises. This paper describes some of the challenges that impede efforts to reduce development time for complex project. Many of challenges are related to "Design Iteration" that is discussed detailedly. A model of Design Structure Matrix is put forward. The "Design Iteration" can be identified clearly and definitely by DSM and the design management methods based DSM is beneficial to short new product development time.     

Power Flow Analysis of System with UPFC

This paper first analyzes the working mechanism of the UPFC,and a practical method of power flow simulation is presented.The method can bring controlling of UPFC to accord with power flow simulation in the best,and can calculate the power flow with several UPFC.IEEE 5 nodes system and IEEE 30 nodes system are tested.     

The Determines for the Warehouse Type Rubber Zero Shear Viscosity of Asphalt

First of all, using the low-frequency vibration test on asphalt, rubber asphalt warehouse and their RTFOT Short-term aging products have been tested ;Secondly, application of graphic epitaxial method, Cross model and Carreau model fitting for various materials Zero shear viscosity were determined;finally, the creep of matrix asphalt recovery test, creep through phase and recovery phase of asphalt strain response calculation, obtained under the action of static Shi Zai matrix zero shear viscosity of asphalt.The study shows that: Matrix asphalt in low frequency vibration test, with the lower frequency will enter the viscosity stable stage, can use graphical extrapolation method to get the zero shear viscosity; however for RTFOT after aging of asphalt rubber, in a test condition did not enter the viscosity stability phase, not through a graphical extension method to calculate the zero shear viscosity; by Cross model fitting results greater than the same material Carreau model fitting results.     

Modularity Design in Customization Marketing of Third Party Logistics

This paper focuses on the key tactics and technology in customization marketing of Third Party Logistics -design modularity of logistics product, which is be researched deeply. The modularity figure of logistics product, and depth management for modularity are constructed by adopting boston Matrix in order to avoid over-customized. Personality customization is realized through making up module differently for Third Party Logistics corporations, to satisfy the demand for customizing and responding the market fast.     

Simulation analysis on stimulation patterns of three-dimension electrical impedance tomography

To solve the lack of information and the error in forward and inverse problem caused by the approximation of actual three-dimensional field from two-dimensional field in electrical impedance tomography (EIT), this article presents a new EIT system. This system improves one-dimensional electrode array to two-dimensional array, and extends the solution domain to the entire three-dimensional field in order to increase the information quantity and eliminate the model error. Based on several current stimulation patterns in EIT which might yield the best sensitiveness for 3-D field, we calculate the forward problem by finite element method and the distinguishability and surface projection image method. The results show that the back electrode pattern has obvious advantages in detecting depth and precision, and has convenience in clinical application. The conclusion of this article can provide reference for the study of 3-D EIT.     

Numerical Computing Method of Conductive Concrete Applied in Construction Heating Engineering

It is worthwhile for saving energy and protecting environment to use conductive concrete as an indoor heating engineering material. Indoor temperature is the key concern of heating system. Based on convection, radiation and Joule effect, a method to calculate temperature of concrete and indoor air was presented. The method did not need to model the air, which simplified the preprocessing. The numerical result agreed with experiment satisfactorily, with a difference of 2.40%, which proved the correctness of the model. Numerical tests of different conditions showed that electrical resistivity with higher potential than power voltage and concrete thickness was the key to increase heating efficiency.     

Analysis for a Broken and Debonging Fiber in Ductile Matrix Composites

By studying the influence of the debonding fibers in composites under cyclical thermo mechanical load the distributions of fibers and matrixes stress are given around the debonding fiber. For illustrating the Boron/Al, continuous fiber composite is examined. Matrix around the debonding fiber only sustains shear stress. The constitution relationship of matrix is perfect elastical-plastical. The important conclusion is made, which lays a foundation for continuing studying the fatigue of composites.     

Reliability evaluation algorithm for complex electrical distribution networks using the storage structure of adjacency multilist

A section algorithm of reliability evaluation for complex medium voltage Electrical Distribution Networks (EDNs) using adjacency multilist (AM) is proposed. The constructing method for AM is introduced. The AM can be used to store the structure data of EDNs and to solve the problem of space & time complexity. A new power flow algorithm of backward / forward sweep is proposed and a fast algorithm of forming sections in distribution network is put forward. The proposed algorithm makes a perfect combination of the power flow algorithm and the section algorithm of reliability evaluation, which makes efforts to decrease the work of programming and saves the computing time. Applying the proposed algorithm in RBTS-BUS6 system and actual EDNs, the reliability assessment results show that the algorithm has an advantage of saving time and possesses efficiency in engineering practicality.     

Parameter Design for the Power Train and Simulation of the Dynamic Performance of Elctrical Vehicle

The method and principle of the parameter design for the power train of EV is explored and discussed,then the parametersof EV. based on SC7101 are reasonably selected.The method of calculating the SOC of Lead_acid battery is provided and the relation among the electromotive force,the interior resistance, the polarized resistance and the SOC are analyzed. The capacity is compensated according to the relation between the capacity and the temperature, which is the basis on which the energy management system is designed and improved. The dynamic model which reflects the dynamic characteristics of the power train is established,then the dynamic performance of the EV based on SC7101 is simulated, and the factors that affect the continuous mileage of EV are analyzed,the measures to increase the continuous mileage are provided.The result shows that the analysis of the electric characteristics of battery and the dynamic model are correct,and the dynamic performance perfectly meets the need of the design target.     

Examining brain oedema through brain electrical impedance topographic mapping

Change of Brain Electrical Impedance has great relations with brain oedema and brain block, a new method of Examining Brain Oedema through Brain Electrical Impedance Topographic Mapping(BEITM)is reviewed. Network topology structure that used in BEITM are also presented. According to topology, we discuss the drawing algorithm that based on triangle element. Some patients have been measured to make clinical data, according to this data Brain Electrical Impedance topographic come into being by computer at last, functional imaging has been implemented. Clinical case analysis compared with change state of an illness and repeatability of steady patient's data has proved the method is feasible.     

Design of Automobile-inertia-brake-testing-system Based on Electrical-inertia

The traditional Automobile-inertia -brake-testing-system adopts the Mechanical Inertia pan to imitate automobile the Moving Inertia. This kind of system volume is bigger than new one, more difficult in inertia adjusting, and lower in automation degree. Aiming at the problems, this paper puts forward the innovative design of Automobile-inertia-brake-testing-system based on electrical inertia. The mathematic model of the Mechanical Inertia is analyzed. To use the algorithm to control motor, the authors make the output inertia generated by the controlled motor can imitate the Mechanical Inertia, then apply electrical inertia to replace Mechanical Inertia .The simulation result shows that the design idea is correct and feasible, stronger in system rubustness, lower in cost, more accurate in control quality, and higher in automation level.     

Experimental Study about Activated Water Generated by Electro-hy draulic Impulse Improving the Mechanical Performance of Concrete

A new good idea named Electro-hydraulic Impulse is described in the paper. Electro-hydraulic impulse is a process which integrates strong electrical field, strong magnetic field, ultrasonic wave, radiation of light and cavitation. With it, a kind of water named strongly polar activated water is generated. Using strongly polar activated water to make concrete blocks, the mechanical performance of concrete can be improved greatly. With the proper parameters, the compression strength of concrete can be increased by 48% percent. This has been proved by some experiments.     

宰后牛骨骼肌肉生物电阻抗特性初探

用四电极法在多频(5-200kHz)条件下对宰后牛骨骼肌肉的电阻抗特性进行了初步的研究。发现牛骨骼肌生物电阻抗与肌肉纤维方向、电流信号频率和宰后肌肉所经历的阶段有关。横向电阻(沿垂直于骨骼肌纤维方向)大于纵向电阻(沿骨骼肌纤维方向),而且受电流信号频率的影响较明显,尤其是在5￣100kHz范围内。牛宰后生物电阻抗的变化与pH值的变化有一定的相关性。