Advanced Materials Research Vols. 301-303

Abstract: In our country, corn straw is byproduct of agricultural products and its output is quite great. So, through microbial technology, degradation of corn straw which has high fiber and lignin has important economical values and environmental significance. This paper summarizes general regulations of biodegradation of corn straw, through several main microflora.

Abstract: Whether laser surface strengthening on module steel can have an effect on intensity, shock resistance and wearing resistance. Through analysis of different materials with different laser methods, this paper uses high-power carbon dioxide lasers to process the work of strengthening laser on CrWMn, conduct structural analysis and test on laser hardening layer, through data and figure, demonstrate that primary structure of the matrix is obviously detailed after processing and the intensity is obviously strengthened. After laser surface melting on H13, we find that the surface flawless, smooth, even and fine, highly intense and non-corrosive.

Abstract: Reaction kinetics of the esterification of Methyl Formate (MF) is studied in a batch reactor at different temperatures and the reliability of the estimated parameters is analyzed with Matlab using a fourth order Runge-Kutta method in the paper. Kinetic constants were experimentally examined and used to calculate the optimal operation parameters of semi-continuous reactive distillation for production of MF in order to minimize the amount of unconverted Formic Acid (FA) remained in the bottom. The results show that the optimal condition is obtained at the formic acid/methanol mole ratio of 0.5:1 and the mass fraction of formic acid at the bottom is 2% which is very close to the calculated value. Simulation work was carried out with Matlab and the results showed good agreement with the experimental data.

Abstract: Non-uniformity of luminance for big screen of LED flat panel display is one of problems affecting its display qualities, but existing widely. This paper analyzes the influences of luminance non-uniformity on LED display images, gives a plan on luminance uniformity correction based on CCD, and then proceeds correction algorithm of correction technology, at last conducts luminance non-uniformity correction for LED flat panel display from brightness datum of CCD image processing, which gives results and analysis before and after correcting.

Abstract: In present IC design, the process variation such as the litho distortion has made the accurate extraction of parasitic capacitances of interconnects become more difficult. One of the problems is the generation of some small deformation including small angle, which makes it difficult to mesh generation when using 3D FEM solver, and the scale of the equation becomes larger. This paper uses the FEM with the perturbation to deal with the issue. We first build the matrix equation with the nominal geometry parameters, and then add the perturbation terms by using the derivative of the matrix and the dimension changes of the distorted conductors. The pertubated system equation is then solved to get the capacitances. The result shows that the method provides accurate capacitances with less CPU time and memory.

Abstract: The work in this paper focuses on developing online measurement and automatic control systems for mercerizing lye concentration and presents the measurement principle and control algorithm in detail. The lye concentration was measured by the system using PLC as controlling core with proportion method. The whole system was connected by overflow pipelines and pumps, which realizes the rapid cycling and online detection of lye, ultimately achieves the reuse of working lye and effectively reduces emissions of lye.

Abstract: To research the friction coefficient of rough surface under different contact loads. A mathematical model is proposed between the fractal parameters D and G and the non-dimensional real contact area based on M-B fractal contact model, surface profile curves are scanned by APE500 surface morphology, dimension change index k and size change index s are identified in tests, the model is verified on UMT-3 pin-on-disk wear apparatus. Results showed that the modeling method relying on limiting cases is feasible, this model could improve prediction accuracy of friction coefficient, and the experimental results are consistent with the theoretical prediction.

Abstract: By using sewage sludge together with river sludge and pulverized fuel ash to produce lightweight aggregates are useful techniques to reuse the sludge. The raw materials was pretreated and manufactured into pellets with diameter range 5mm-8mm and mixture ratio (dry basis) sewage sludge 30wt%, pulverized fuel ash 15wt% and river sludge 55wt%. In order to be more certain about the characters during the combustion process of the pellets at different heating rates, thermogravimetric analysis was employed to study the thermal dynamics. The differential thermogravimetry profiles showed that the combustion process of pellets include five phases and temperature up to the maximal weightlessness speed peak increase with increasing of heating rates. The comprehensive combustibility of pellet decreased with increasing of heating rates. By using improved Coasts-Redfern integration method to calculate the parameters of pellets combustion characteristics, establish the non-isothermal kinetics models and numerically simulate the procedure of sintered LWA. The research results can give service to the simulation of combustion dynamics of taking sewage sludge and other combustible solid-liquid waste materials as raw materials to produce lightweight aggregates by an innovative designed Arc Blade rotary kiln in Chongqing, China.

Abstract: The steel rod is an important part for project fields , and it is large-scale to be used. it is apt to crack, corrosion and so on in the poor working conditions. In order to recognize correctly the type of defects, a method was presented to extract frequency band energy feature by using wavelet package decomposition. In the meantime, to extract the peak-peak value in the time-domain and make the mixed feature vector. With the way of pattern recognition, the best recognition way was got by comparing the BP artificial neural network(ANN), PNN(probability neural network) artificial neural network and "one-versus-one" support vector machine(SVM).The result showed that the recognition rate of SVM was more suitable for defects’ identification in steel rod.

Abstract: We explore the terahertz (THz) wave generation based on surface-emitted difference frequency generation (SEDFG) in periodically-inverted GaAs crystals. One scheme applying collinear quasi phase matching (QPM) is proposed. The wave propagation of the higher frequency pump wave is parallel to the wave propagation of the lower frequency pump wave, and both of them are perpendicular to the domain wall of the nonlinear crystal. The THz wave is emitted perpendicular to the surface of the nonlinear crystal. We calculated the grating period of periodically-inverted GaAs at the range of 100-1000μm (0.3-3THz). Our estimates illustrate that THz wave output corresponds to the power conversion efficiency of 0.015% at a frequency of 1THz. The result is shown that this scheme is efficient to obtain THz wave.