Advanced Materials Research Vols. 383-390

Abstract: In order to improve the accuracy and efficiency of automatic counting of microscopic cells, the method based on the Hough transform has been proposed. And the standard Hough transform has been improved using image gradient information. Compared with the traditional counting methods based on mathematical morphology and boundary tracking tags, the accuracy of the counting accuracy has been greatly improved. The results show the accuracy and efficiency of counting of the microscopic cells based on grads Hough transform is improved.

Abstract: Capacitance-voltage method was used to analyze composition of the Si_1-xGe_x alloy films with a stochiometry gradient of Ge, which were epitaxially grown on Si (100) substrate by chemical vapor deposition. Using the capacitance characteristics of Si_1-xGe_x/Si obtained by applying a reserve bias to the Hg electrode probe, the contact barrier height for Hg/Si_1-xGe_xjunction and Si_1-xGe_x/Si junction, and band gap of SSi_1-xGe_x were estimated respectively. With the band gap of Si_1-xGe_x, composition of Si_1-xGe_x in Hg/Si_1-xGe_x junction and Si_1-xGe_x/Si junction were further obtained. Because analyzed Si_1-xGe_x was formed through bilateral inter-diffusion of Si into the epilayer and Ge into the substrate during the deposition, Ge distribution from surface to substrate in Si_1-xGe_x alloy films can be figured out by fitting to diffusion exponential function. The Ge distribution acquired this way was in accordance with the depth profile by auger electron spectrum.

Abstract: In this work, Si, Ge element composition distribution in Ge /Si_1-xGe_x:C /Si substrate structure has been characterized and modified by planar scanning energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The Ge /Si_1-xGe_x:C /Si substrate samples are grown by chemical vapor deposition (CVD) method. The accuracy of EDS value can be improved by ~ 32%. And the modified EDS results indicate the Ge distribution in the Ge/Si_1-xGe_x:C/Si sub structure.

Abstract: Based on summarizing a stand-alone running strategy of distributed power inverter and analyzing the possibility to control grid-connected power inverter with the same strategy, a novel micro-grid power inverter control method is proposed in this paper. While applying this method, the power inverter can not only output power in the grid- connected scenario, but also automatically produce power to satisfy the power demand or non-power demand about the load and power-sharing among inverters when the islanding and stand-alone events take place. It overcomes some traditional power inverter shortcoming that it can not make micro-grid smooth transition from grid-connected to islanding and to stand-alone status, due to the delay during different strategies being switched. At last, the effectiveness of the proposed method was proved by simulation results.

Abstract: The paper means to establish a tension control system of filament winding machine through analyzing the theory tension control system.The auto-adapted PID controller of single neuron are introduced.

Abstract: The dynamic characteristics of temperature sensor are very important in industrial temperature measure. In this paper, the dynamic characteristics of temperature sensor of AD590 has been researched on the same step volume and different initial temperature, and the different step volume and the same initial temperature, and in the state of the protected pipes and unprotected pipes by combining the theoretical model and many experimental data. Based on the theory of dynamic characteristics of sensor, a large number of experiment data was analyzed and compared, the time constant τ was obtained, also we discussed the relationship between the time constant and the amount of the step, and predicted the mathematical model and analyzed the main factors that affecting the dynamic characteristics of temperature sensor.

Abstract: Parameter identification method is researched for the single-input and single-output systems in this paper. Based on the analysis of method of least squares, the new system identification method based on PID control algorithm is proposed. The PID controller is established by connecting the input and output with the system error and the system parameter. And the results of the simulations state that the new identification method is feasible and effective.System identification is the most important part in modern control theory. The definition of system identification proposed by L. A. Zadeh is that, system identification is determination the system in the gained systems which equivalent to the unknown system, according to the input and output of the unknown system. Traditional identification methods include impulse response, least square and maximum likelihood [1-2]. Identification speed and identification precise are all needed in the system identification. But identification speed is incompatible with identification precision. The improvement of identification do always conduce to the increase of identification precision, it can be verified by the identification examples, which is identified by the traditional identification methods. So for higher identification precision, the identification speed is lower. Now, a lot of high precision identification methods based on neural network or genetic algorithm, is proposed [3-7]. These new identification methods can gain very high identification precision, but it needs too much time. A new system identification method based on PID controller is proposed in this paper. It states by simulation that the new me-thod can improve the identification precision and speed.

Abstract: From the machining errors and static dynamic error influence two aspects are discussed in this paper, the analysis of machining process on the processing precision influence of error, puts forward process design. Long-term since, improving precision machine tool is through the two methods: error and avoid error compensation. Avoid error is a "hard", focusing on design and processing in the error may eliminate all stages. And error compensation in existing machine, can work environment to further improve the machining precision, it is a kind of economic effectively improve the machining precision of the method. For error analysis and calculation, the ultimate goal is to eliminate and reduce processing error, the improvement of the machining errors of classification in many ways. According to the machining process of the factors causing error to occur any regularity, processing error into system error and the random error, According to the nature of the changes with time, and can be divided into static error and dynamic error.

Abstract: Quantitative assessment of muscle spasticity is an important issue in the rehabilitation medicine. However, there are a small amount of qualitative and quantitative assessment be used in clinical studies for that the mechanism of vasospasm is not clear yet. The objective of this paper is to suggest a totally new method using independent component analysis (ICA) to analyze spasticity and indicate possibility to apply this method for evaluation of spasticity. In order to simulate the experiment of human swing leg angle bending system, an entry system with the input signal and the original angle had been established. And the system's pulse signal had been reconstructed. By comparing the thigh swing test experiments of healthy people and patients and analyzing their different impulse signals and impulse responses, the index of evaluation of spasticity had been obtained.

Abstract: Tower crane belongs to high risk equipment in the construction site. Evaluating safety statement of tower crane is a subject of the technical field. The paper setups a new way to evaluate the safety statement of tower crane by means of fuzzy assessment theory. Membership functions have been established for describing the influencing factors of tower crane safety. Fuzzy comprehensive assessment model for evaluating tower crane safety statement has been established. Finally an example for illustrating the method of using the fuzzy comprehensive assessment to analyzing the tower crane safety statement.