Advanced Materials Research Vols. 1049-1050

Abstract: Coal gasification wastewater, as a typical industrial wastewater has poor biodegradability and high toxicity. In this paper, simple anaerobic shaker test was conducted to investigate the degradation of hydroquinone in coal gasification wastewater. Anaerobic sludge shaker test were run for 27, 50 and 73 days, the phenol concentration were adjusted to 300 mg/L and 500 mg/L with pH 7.5, respectively. The experimental results also showed that this system could effectively deal with COD and phenol removal and remain in a stable level when the operational parameters altered while the hydrolysis acidification at 45h is appropriate. Organics degradation and transformation of anaerobic coal gasification wastewater samples at 12h, 24h, 36h, 48h, and 60h were analyzed by GC/MS and it was found that hydrolysis acidification played an important role in degradation of methyl phenol, hydroquinone and refractory compounds. Therefore, the results illustrated that the simple anaerobic shaker process is an easy way for pollutant degradation and treat coal gasification wastewater effectively.

Abstract: The desulfurization of low-concentration sulfur dioxide in laboratory simulated flue gas and on-site metallurgical flue gas was carried out by activated carbon adsorption in combination with microwave desorption. In comparison with the results of desulfurization, the effect of gas impurities in on-site metallurgical flue gas on the performance of activated carbon adsorption and microwave desorption, as well as the consumption of activated carbon during the desorption process, was also studied. The results show that the gas impurities decrease the unit adsorption capacity by 28.73mg/g and increase the consumption of activated carbon by 0.25g, thus go against the adsorption of activated carbon. Moreover, the use of on-site flue gas as microwave carrier gas in the desorption process can benefit the accumulation of medium-or high-concentration SO₂ from the desorption process which can be used to produce acids.

Abstract: High temperature chlorine corrosion problems in refuse incinerator get more and more attention in recent years. At present, there is no uniform method of detection of chlorine. In this paper, three common detection methods are introduced. Combined with quantitative experiment, the detection effects of these three detection methods are compared.

Abstract: The unit cell models of PI/SiO₂ nanocomposite was built by Materials Studio. The stiffness matrix and mechanical properties parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio of the unit cells were achieved after molecular dynamic (MD) optimizations and calculations. The influence factors on the mechanical properties of nanocomposite were analyzed. Finally, the optimization model was achieved.

Abstract: This text passes a kind of research that used for the Ultrasonic Horn that the Composites Machining, according to the calculation of the theories with physically applied medium of experiment contrast, tally up the superior calculate way. choice of the Horn material the Horn clip tight position etc. provide a Technical Support for engineering application.

Abstract: experiment is the basis of research on titanium dioxide (TiO₂) photocatalysis. However, the proceeding of experiment need consume large amount of time, finance and vigor. Computer simulation realizes the mutual effect with outside by system of computer simulating authentic material, which can reduce unnecessary consumption. Computer simulation application provides new tool for TiO₂ catalytic experiment and improve the efficiency. This paper summarized the basic structure of TiO₂ as well as the mechanism and process of photocatalysis, introduced the main method and relative software of theoretical simulation mathematics, and summarized the advantage of computer simulation in micro field based on the limitation of experiment.

Abstract: During the Ti6Al4V machining, the oxygen reaction will happened to form oxide film in the cutting zone under high temperature and pressure, which effect the cutting process. In this paper,the effects of oxygen on cutting process in machining Ti6Al4V with carbide alloy tool YG8 was investigated. The oxygen element generation, the chemical composition of the oxide and the oxide film generation in cutting process was studied. The research results show that variety of oxides generated in rake face and oxide film formed in the tool-chip contact surface, which effect the cutting process and tool life.

Abstract: For High altitude airship (HAA) with long time affected by space harsh environment, due to the occurrence of natural light radiation aging physical and mechanical properties, fiber-reinforced airship envelope material results in degradation of the mechanical load performance, even causing damage to the balloon airship. Based on the ground aging simulation of the airship envelope material under the natural light, the morphology of airship envelope material in the natural aging process can be observed and the specimen comparison test is carried on for its fracture strength and breaking elongation to qualify its mechanical properties. The specimens with the axial angle of 0°and 90°were respectively tested to get its mechanical properties and the comparative analysis on degradation of fracture strength and breaking elongation before and after its 720h aging is developed too. The test results shows that the mechanical properties of different specimens decrease, wherein the maximum degradation is 0° specimens and that of 90°specimens t is not very significant weakening. Natural aging characteristics of airship envelope material provide support for the design and improvement of anti-aging properties of the airship envelope material.

Abstract: Stratosphere airship envelope material is composed of multilayer laminated film material reinforced by fiber. As the same as other film material, it occurs del-zone in the course of crack tearing propagation, which is significant for envelope material mechanic studies. Many researched unlined its application, not it’s forming factors. The paper focus on crack or notch shape effects on the del-zone. Six groups test including specimen with no crack, central crack, square notch, diamond notch, circle notch, and rectangle notch are carried on under the stretching instrument to find the different del-zone phenomenon and get displacement-load curve. Combined with theory, the paper try to explain the del-zone differences for specimens and explore the shape notched sensitivity to specimen. The results shows that different specimen have differences on del-zone, further affecting the specimen module and fracture strength. In turn, it manifests that to some extent, the size del-zone decides fracture stress value, providing advice for airship envelope designing.

Abstract: High altitude airship (HAA) envelope material is vulnerable to be damaged and become failure with the long floating time in the space while withstanding severe and bad high space environment. HAA envelopee is composed of fabric laminated composite and the fabric yarn bundles are the main part to bear outer loads. Also the main bearing part is woven by Kevlar filaments and it is valid to analyze its mesomechanical properties as two-dimensional textile material. On the basis of yarn bundles mechanics, the paper considers the elastic and plastic deformation and collides among the bundles for its analysis. And the mesomechanic model is built to explore mechanisms on tearing propagation of pre-notched envelopee material samples. The results from the model computed by program language Matlab are compared with the test data for the same model. The comparative results are almost line with what the engineering requires.