Applied Mechanics and Materials Vols. 121-126

Abstract: In order to put forward the Anti-scale measures of shaft in Shunan Gas Mine and guarantee the normal production of gas field,the composition as well as the water quality and scaling type for gas production water at the typical shaft mouth of Shunan Gas Mine are analyzed and the scaling mechanism of shaft and the influencing factors are described as well as the anti-scale agent and the solid anti-scale blocks pertaining to the scaling of shaft in Shunan Gas Mine are obtained.

Abstract: Through the analysis of energy-consumption in the link of design–setup–buildup–withdrawal-transportation in exhibition process; exhibition’s circulation application has been discussed; the characteristics of energy-consumption in modern exhibition management, implementation and material application has been comparatively analyzed; then, suggestions are proposed to establish the influence model of material and ecological environment and the circulation application model of modularized building elements. The account method of energy consumption in exhibition application has proved the value of the application of circulative energy-conservation in exhibition project, providing the theoretical basis for sustainable development of exhibition business.

Abstract: Through testing the mountainous shallow-buried coal seam mining working face strata behaviors in Faer mine field, it got the strata behaviors: it was of large roof pressure, high rate of safety valve opening in hydraulic support, and even some supports crushed or took separation between top beams and tail beams. Traditional method of calculating supports’ resistance can not be applied to mountainous shallow-buried coal seam mining working face. With the discrete element simulation software UDEC it analyzed the strata movement feature, and got that the overlying strata took collapse and horizontal displacement after mountainous shallow-buried coal seam mined, and the strata movement feature was different between reverse slope mining and positive slope mining.

Abstract: In this paper, traditional adhesives were replaced by recycled plastics to make poplar plywood by hot-pressing. The results showed that the amount of recycled plastics made no obvious effects on the bonding strength, and the dry bonding strength reached the maximum with the amount of plastic film of 100g/m2. When the hot temperature was 150°C, the bonding strength no longer increased with the temperature, or even decreased. When the pressing time was 5 minutes, the bonding strength achieved the peak value, and then declined along with the extending of time. After testing, formaldehyde emission was found to be very low or zero. The new plywood is a kind of green and environmentally friendly wood-based panels. Above all, it could be concluded that the amount of plastic film of 100g/m2, the hot pressing temperature of 150°C and the hot pressing time of 5 minutes were the optimum process conditions in this experiment.

Abstract: The relationship between thermal resistance ratio ζ(the ratio of thermal resistance between two sides of the tube wall) and load rate, according to heat transfer theory, is derived from simplifying the heat transfer model of heat exchanger. Considering the different running time of heat exchanger under variable load, the operation heat is proposed. Then the range of thermal resistance ratio for evaporator and condenser is determined and the law of thermal resistance is validated by analyzing the example. As a result, the relationship between rib effect coefficient and the thermal resistance ratio is established. Furthermore, value analysis of rib effect coefficient is analyzed. Results of this study show that the heat transfer performance of evaporator and condenser maximizes when ζ=1 at the partial load rate of (0.25, 0.50). Meanwhile, rib effect coefficient on the water side is less than that of the refrigerant side for evaporator and condenser.

Abstract: The 12CrMoV alloy steel is the most commonly used high pressure vessel and heat pipe using the material. This article on external forcing 12CrMoV alloy steel of high-temperature oxide layer for microscopic analysis of oxide layers of micro-cracks and exfoliation, oxidation layer portion of the oxide layer break, the oxide layer fold, multilayer structure oxide, oxidation and give the structure of the matrix and the proliferation of microstructure of the oxide layer. To compare 12CrMoV alloy steel for high temperature oxidation layer in a load-time and there is no loading time variation of topography.

Abstract: Based on the analysis of main texture information in the neighborhood of image, we use the grey relational coefficient to decide the most obvious texture direction, which is conductive to selectively increase the local contrast of surface image. Simulation results show that the algorithm can obtain better experimental results, and it is a good method worth continuing to study later.

Abstract: This paper compares the properties of concrete made by reclaimed fine aggregate with those made by other fine aggregate. Although the properties of reclaimed fine aggregate and other kinds of fine aggregate are different, especially the strength of reclaimed fine aggregate is lower than that of manufactured sand. It is concluded that the fluidity, the strength and the elastic modulus of concrete made by reclaimed fine aggregate are almost similar to those made by other fine aggregate. When it comes to the making of concrete, reclaimed fine aggregate can serve as a substitute for other aggregate. Moreover, it can enhance resources utilization and reduce environmental pollution.

Abstract: Violation of discipline by students may have a direct impact on the school spirit and academic atmosphere construction of colleges and universities and is becoming a hot issue which is brought to public attention. Survey and analysis have been conducted on violation of discipline by students of Petroleum and Natural Gass Engineering College from such three aspects as type of discipline violation, type of punishment as well as education background of students being punished so as to better adapt to the student management work under new situation and timely and accurately grasp the trend of student discipline violation in current stage. The paper aims to analyze and explore the reasons of discipline violation by students of Petroleum and Natural Gass Engineering College and its inherent law through deep analysis on both subjective factors and objective factors leading to disciplinary offence. Corresponding precautionary measures and countermeasures have been put forward to reduce and even avoid the occurrence of disciplinary offence by students.

Abstract: Because the correlation coefficient of noise between the adjacent channels is greater than 0.The Phase-Inversion Symmetric Method (PISM) can be used to eliminate noise and get larger SNR. The adjacent channels include adjacent frequency band, adjacent time buttress and adjacent space. This paper introduces the use of PISM in the frequency, time and space domain.