Advanced Materials Research Vols. 230-232

Abstract: This paper presents the new technology and applications on microwave sensor for moisture content measurement. A dual-frequency microwave sensor based on circular microstrip antenna has been developed to measure moisture content(MC) of lossy liquids. The experiment is based on measurements of far-field reflection at two frequencies in the X-band,8.48 and 10.69GHz. Moisture content of the rubber latex samples can be determined with a standard error 0.49%.A prototype microwave based moisture sensor system suitable for the kiln drying of hardwood lumber has been developed. Using the prototype electronics and sensors, have obtained measurements of MC over the above MC range for red oak and yellow poplar with standard deviations of less than 1.5% MC at 4.5 to 6GHz.A smart active microwave sensor for measuring the moisture content of felts used in the paper milling industry and more generally of sheet-like materials is presented. An inversion procedure based on an Artificial Neural Network (ANN) approach is proposed in order to determine the moisture content of the felts. Finally the technical challenges and developing prospect of microwave sensors for Moisture Content Measurement are discussed.

Abstract: To present the essence of information system risk evaluation and improve the effect of evaluation, the paper puts forward a business process-based information system risk evaluation after analyzing the current risk evaluation methods. The framework begins with the description of business process in perspective of information security and then analyzes and assesses the business activities. The risk-control evaluation of business activities is brought forward and the optional security control measures are comprehensively evaluated so as to ensure security of business activities. The framework focuses on business process activities so that information system assets, their vulnerabilities and threats are associated and evaluation of isolated and meaningless assets is avoided.

Abstract: In order to reveal the mechanistic characteristics during the elliptical vibration cutting (EVC), A simplified 2-D finite element model is developed. The characteristics of the cutting forces during the EVC process are investigated by comparison with the conventional cutting. The results indicate that the lower averaging values of cutting forces can be obtained and an obvious inverse phenomenon of the thrust force is also observed during the EVC process, which may be beneficial to the chip formation. A detailed analysis of the equivalent stress distribution during the EVC process is carried out. A transient stress distribution is observed during the EVC process, the highly localized Von Mises stress in the tool-chip contact region throughout one EVC cycle may help to form a more continuous chip and lead to the ductile regime removal of brittle materials.

Abstract: Using Ultrasonic Testing to test the coating thickness of various industrial structure is a commonly used thickness measurement method. But in some special structures, such as steel in the solid rocket motors. insulation structure, the coating thickness could only be tested by the Ultrasonic emitted from the outside of the steel ,This paper presents a method of using resonant relationship of the two detection echo as the delay time of eigenvalue, and make the eigenvalue extraction boil down to a multi-pattern recognition problem. using a self-design binary tree classifier to classify them, effectively improving the feature extraction accuracy and the signal to noise ratio of the thickness detection.

Abstract: Several kinds of main stalk and stubble processing technologies and corresponding machines used in Liaoning Province are researched in this paper. The key parameters influenced stubble chopping are analyzed on the basis of understanding the principles of “ 2BISJ-2110 precision planter”. In order to solve the shortcoming of disturbing much soil and more power loss of“2BISJ-2110 precision planter” and achieve saving materials, reduce the cost and the water massive disappearing due to the agitation of the soil, entire stubble chopping is changed to seed line stubble chopping. Using the computer VB language to study the parameters of stalks and stubbles according to mathematical model about coulter ends and the path. In order to realize the narrow band and shallow treatment of the stalks and stubbles , taking single ridge width as 100-110mm and using the Solidwork software to design and draw rotary blade , L stubble breaking blade, cutter head ,blade holder , roller and so on . 2 kinds of feasible knife roll disposition plans are presented, which provides a design basis for new type narrow band rotary cultivation stalk and stubble chopper.

Abstract: This paper introduces a modified financial chaotic system. Some basic dynamical properties are studied. Based on Lyapunov stability theory and LMI (linear matrix inequality), sufficient condition for the synchronization has been analyzed theoretically. Numerical simulations are given to show the effectiveness of this method.

Abstract: In this paper, by analyzing the characteristics of the data, we adopt lossy compression based on predictive coding method and FFT. Firstly, two-way differential prediction method is used for data, and then the predicted data is transformed into the frequency-domain data and only the significant components are selected, and finally three classical adaptive compression algorithms are used to compress the significant components, and have made a good compression ratio. Then, our algorithm is tested and compared with Winrar software, and our algorithm is superior to it using our test data.

Abstract: Based on FPGA’S Balance and exchange principle of area and speed, Using the FPGA internal rich logic resources and powerful hardware characteristics , the traditional median filtering algorithm is reduced to 2 clock cycle , Greatly improving the image processing speed . And by using threshold, in a certain extent, reducing the image fuzzy phenomena brought by the median filter . The results of test show that the system runs stability, the time of achieving the median filtering algorithm are narrowed to the shortest clock cycle.

Abstract: A calculation method of fatigue life for main shaft bearing of direct drive wind turbine was proposed. The statics models of the bearing were established and a set of equilibrium equations were obtained. By solving the equilibrium equations, the displacements of the inner ring were obtained, and the rolling element loads were calculated further. Based on the load distribution of the rollers, the fatigue life of the bearing was calculated and the influences of the clearances on it were researched. Results show that the clearances of the bearing can influence its service life distinctly. Zero axial clearance is recommended for the bearing.

Abstract: The modification of sodium trititanate whisker surface was performed by means of impregnation procedure to fabricate the modified sodium trititanate whisker, which was characterized by infrared spectroscopy(IR). Its adsorptive performance for Co(II) in a static system was investigated by FAAS. The main factors affecting adsorption and desorption of Co(II), the adsorptive capacity of Co(II) in optimal condition and adsorption isotherm. The adsorptive rate for Co(II) on 0.2500 g of modified sodium trititanate whisker at PH 6.0 was the best. Co(II) adsorbed on the modified sodium tretitanate whisker could be eluted with 10 mL of 3.0 mol/L HCl. The adsorptive performance of modified sodium trititanate whisker was better than that of unmodified sodium trititanate whisker.