Advanced Materials Research Vols. 328-330

Abstract: For the purpose of energy utilization and environmental protection, a solar thermoelectric air conditioning is designed which is different from traditional air conditioning. It has many advantages including environment friendly, refrigerating quickly and applying flexibly. Solar thermoelectric air conditioning utilizes thermoelectric effect of semiconductor materials to achieve the purpose of refrigerating and heating. The direct current which flows into semiconductor materials is provided by solar photovoltaic device. This paper demonstrates the main factors which influence thermoelectric air conditioning such as thermoelectric materials, air supply and heat transfer temperature difference, solar photoelectric devices and so on. In addition, comprehensive analysis of the refrigeration coefficientis obtained. Finally, the paper puts forward measures for improving the efficiency of thermoelectric air conditioning so as to study in the future.

Abstract: In order to improve the anti-seismic performance of the NC tool rods in the cutting processing, it’s necessary to study the knife shaft material’s influence to its anti-seismic performance. Based on the finite element analysis of the different materials’ NC tool rods, the study obtains their distribution diagrams of the displacement distribution and the maximal displacement parameters by simulation of the actual processing. And the results show that the material of the NC tool rods has an important influence on their anti-seismic performance, thus it provides a basis for the material of the NC tool rod’s choice and using.

Abstract: Laser drilling technology is a new feasible and developing method of rock destruction. The unified modeling method of laser and rock interaction is a complicated subject of heat transfer science. According to the energy conservation law, the fundamental equation of heat transfer is established. Some primary parameters such as enthalpy, thermal conductivity and specific heat are simplified respectively on the liquid-gas interface or the liquid-solid interface. The general mathematical model of temperature fields on laser drilling process is proposed. Using the Galerkin method, the numerical investigation of a practical example in laser drilling rock is analyzed.

Abstract: The surface of compound eye of ant was observed by using scanning electron microscopy technology. These characteristics on the surface were applied on cone of screw pile for preventing flood and rushing to deal with an emergency. Comparing experiments of piling were conducted before and after the bionic surface was made, and these experiments were conducted under three different soil environments, including soil among the Yellow River, the Yangtze River and the Pearl River. In the experiments, data of strain was tested and collected by dynamic strain gauge RA2300 style. The output was recorded on disc and later the data were processed by computer. The observation results showed that the compound eye of ant was made of a lot of small convex eyes. These small convex eyes were arranged in dense style. They had the characteristics of convex dome. The results of piling experiments showed that the bionic screw pile with bionic surface of cone produced better effect of reducing soil adhesion and resistance than the common screw pile with no bionic surface of cone.

Abstract: Based on the feature of the ELID grinding, heat production mechanism in the ELID grinding was analyzed and a heat source model was given. Heat partition among work-piece, grinding wheel and electrolyte was discussed and a heat partition model was established. And numerical investigation was down. The results indicated that heat in ELID grinding was mainly produced by interaction between grit and work piece. Partition of the heat among work piece, grinding wheel and electrolyte was function of position. Electrolyte and grinding wheel take away the most heat produced in ELID grinding.

Abstract: With the development of science and technology, microfludic chip has become the leading edge in biochip research field, representing major development trend of micro-total analysis system (μ-TAS).Having features of high speed, high efficiency, low consumption etc., it possesses extensive application prospect in fields of gene analysis, disease diagnosis, drug screening etc.. Traditional microfludic chip adopts silicon slice, glass etc. materials to conduct processing with complex technique and high cost chip, thus it is not in favor of promotion and application of chip. The research on hot embossing and bonding machine for plastic microfludic chips fabrication is that to provide efficient processing machine for chip market which is expanded with each passing day. Based on present hot embossing technology of plastic microfludic chips and aimed to realize automation and batch process, the thesis conducts design research on mechanical construction of hot embossing and bonding machine for chips.

Abstract: Tert-butyl peroxybenzoate (TBPB), a liquid organic peroxide, has been widely employed in the petrifaction industry as a polymerization formation agent. This study investigated the thermokinetic parameters of TBPB by isothermal kinetic algorithms and non-isothermal kinetic equations, using thermal activity monitor III (TAM III) and differential scanning calorimetry (DSC), respectively. Simulations of 0.5 L, 25 kg, 55 gallon, and 400 kg reactors in liquid thermal explosion models were performed. It is based on the thermal hazard properties, such as the heat of decomposition (∆H_d), activation energy (E_a), self-accelerating decomposition temperature (SADT), control temperature (CT), emergency temperature (ET), and critical temperature (TCR). From the experimental results, the optimal conditions to avoid violent runaway reactions during the storage and transportation of TBPB were determined.

Abstract: A good site layout can promote site safety and efficient operations. Previous research of this area focused on genetic algorithms, simulated annealing, and tabu search and the solutions were obtained by the iteration of the initial feasible solutions, which differed fundamentally from the reality. In designing a site layout, a planner will first position the key facilities that influence the method and sequence of construction mostly, and will then assign the remaining facilities in the available space that is left over. This process is similar to the positioning of facilities in the Ant Colony Optimization (ACO) algorithms. In this study, we used Max-min Ant System (MMAS), which is one of ACO algorithm is employed to solve construction site layout planning. The results show that MMAS can be successfully applied to resolve site layout problems.

Abstract: Based on qualitative analysis in mechanism of air blowers rotating stall, wavelet envelope spectrum are applied in failure signal analysis of catalytic cracking unit main air blower in a petrochemical company. By utilizing time & frequency localization characteristics of wavelet analysis and extracting detail characteristic of air blower failure, and by Hilbert envelope spectrum analysis, faults are determined and located. The method is applied to failure signal analysis and processing of catalytic cracking unit main air blower in a petrochemical company, which has made a good progress.

Abstract: This paper expounds the application of rotary expanding process to manufacture the large-diameter hot-rolled seamless gas cylinder. Through analytic geometry method, an equation is established among the tail roll gap, roll distance and the plug protrusion distance. 3D drawing software CATIA-V5 is applied to build 3d models of steel tube and rolling tools. The rolling process is simulated by MSC.Marc FEA (finite element analysis) software. Marc’s second development function and FORTRAN software’s extracting finite element node coordinates function are applied to calculate the wall thickness uniformity. A novel method to calculate the wall thickness uniformity after finite element analysis is proposed. The wall thickness uniformity of steel tube after rolling is well simulated and compared by MSC.Marc FEA software, which can help the technologist to predict and choose the best rolling parameter. For gas cylinder rolling, the tail roll gap should be set to 17mm. The roller distance and the plug protrusion distance should be set as 342mm and 78mm separately.