Advanced Materials Research Vols. 926-930

Abstract: Structure vibration is one of the main causes of noise. Thin-walled workpiece has a smaller stiffness,it will easily produce vibrations at work ,and become a source of noice. It is very necessary to study acoustic radiation characteristics of plat,so can we effectively control the structure and connection type of panel structure to change acoustical radiation characteristics.This paper advance a element method to test acoustical radiation characteristics of plat,and take experiment with magnesium alloy sheets.

Abstract: In this paper, we demonstrate the successful fabrication of nitrogen doped ordered mesoporous carbon (PNOMC) materials using polyaniline as precursor. The synthesized PNOMC material exhibits enhanced supercapacitive performance due to the additional contribution from pseudo-capacitance originating from incorporation of nitrogen into the framework of carbon materials. Although the specific surface area of ​​the material is not high (386.2 m²/g), the specific capacitance is as high as the 271 F/g at a current density of 1A/g. The fabrication of nitrogen-doped ordered mesoporous carbon with enhanced electrochemical capacitance performance provides a viable route to promote its applications in electronic devices.

Abstract: In this paper, Zn-hydroxyapatite/chitosan composite was synthesized via a co-precipitation method. Fourier Transform infrared spectroscopy (FTIR) and X-ray analyzer (EDXA) were used to investigate the microstructure of composite. Then, it was used for removal of Co ions from synthetic aqueous solution. The results indicated that the prepared Zn-hydroxyapatite/chitosan was successful prepared and the adsorption pattern fitted well with Langmuir model.

Abstract: Through the coal quality feature, five kinds of coal samples are determined as soft coal, and they are Pingdingshan coal, Yanzhou coal, Xuzhou coal, Zhungeer coal and Shenhua coal respectively according to the coal rank from high to low. With Alfred grain composition model, the municipal sludge with five kinds of coal samples and 95% moisture content (hereinafter referred to as sludge) is conducted the slurry property experiment, we can find that the sludge coal slurry belongs to the false body fluid featured with shear thinning, which is conducive to the pumping and atomization combustion of the sludge coal slurry. The higher the degree of coal metamorphism, the greater the limit concentration of sludge coal slurry, the better the rheological property, and the stability is better.

Abstract: In this paper, according to the KR desulphurization historical data, samples are refined and optimized through prior knowledge, to better meet the requirements of establishing desulfurizer quality quantitative model; then samples are classified using DBSCAN clustering algorithm, on the basis of which desulfurizer quality quantitative model is established.

Abstract: To solve the problem of high-salt ballast wastewater treatment, biological contact oxidation process by combined packing used to simulate the experimental study. When dissolved oxygen is 5 to 6, water temperature is 18 ~ 20 °C, pH is 7~8 and hydraulic retention time is 48h, the Influence of salinity dips and swells process on sludge treatment system and its effects were investigated. The results showed that salinity shock loads on the system less affected COD removal, after 3-5 days short adaptability run, the system became able to restore effluent water stability. The influence of Salinity swells process on AOB, NOB and denitrifying bacteria was greater than a dip .Salinity plunged produced smaller impact on the total nitrogen removal, while in the salinity swells TN removal reduced from 70.7% to 42%.

Abstract: Image pyramid is an important and essential step in many digital image processing applications. In this paper, we demonstrate that modern GPUs can significantly accelerate image pyramid task by using texture memory and well configuring work group dimension and size. Our two pass method behaves faster when compared with OpenCV's image pyramid GPU implementation. Fast image pyramid on GPUs expects to enable real-time image processing.

Abstract: Based on avalanche effect of avalanche transistor, Marx circuit configuration is adopted, trigger circuit and PCB layout are described in detail. The all-solid-state pulse source is designed with 10-stages Marx circuit. The test results demonstrate that its output impedance is 50Ω, the pulse width is 10ns approximately, pulse voltage is about 1.5kV,the rise time of the positive pulse is less than 2ns, the fall time of negative pulse is about 3ns, the operating frequency is 10kHz, coefficient of variation for voltage peak, fall time and pulse width is less than 5%, which is suitalbe as interference source for the EMC experiment.

Abstract: This paper presents a method for the detection of transmission tower. It is a common phenomenon that high voltage and strong magnetic field exist in the environment of high voltage transmission tower. Compared with electronic sensor system, fiber Bragg grating sensing technology could resist harsh environment effectively. As a kind of passive devices, fiber Bragg grating tilt sensor can monitor the tilted state of high voltage tower easily. With the help of on-line monitoring system, we can effectively raise maintenance strategy for high voltage tower and analyze the variation trend of the tower. The system is convenient to repair and maintain the high voltage tower at the same time.

Abstract: Crescent scatterers possess the properties of anisotropy and multiple degrees of freedom. With plane-wave expansion method (PWE), the slow light effect with high n_g and low dispersion can be achieved by optimizing the structure parameters of photonic crystal waveguide with line defect, such as changing the radius of two circles and center distance. Slow light with low dispersion can be obtained by these methods, which implies that choosing suitable scatterers and adjusting their parameters can efficiently achieve slow light with high n_g and low dispersion.