Advanced Materials Research Vols. 291-294

Abstract: A multiscale particle method with the intermediate oscillator is studied further in this paper. Whole domain is divided into atom domain and continuum domain and different method is used in each domain. The overlapping domain is connected by the intermediate oscillator and the energy of this domain is taken to be a linear combination of the continuum and atom Hamiltonians including the energy of the intermediate oscillator. Smoothed energy transfer is observed during this method applied. cases in 1D model are investigated and agreement result is obtained.

Abstract: The detection of a dangerous emission source location has the potential to be enhanced by using plume-tracing mobile robots, without endangering human life during the detection and source localization process. So far, many researchers focus on odor source localization in simple & laboratory based environments. The present study focuses on more real life odor source localization scenarios. In this study, multiple robots were used and coordinated by a supervisory program to locate an odor source in complicated city-like environments. A series of simulations has been conducted and the results demonstrated the potential of the supervisory program to effectively control a number of robots to locate a dangerous odor source in real life scenarios.

Abstract: In order to settle the influence of measuring results of particles with its shape-variety, the scattering pulse width and peak distribution and the relation of particles’ size and shape characters are systems analyzed based on the Mie theory and perturbation ameliorating method. In addition, a theorem of equivalence probability area is setup and a method of obtaining the probability distribution function of shape particles in real time is built. At last, the theories are validated in the experiments. The effect of the particles’ shape is modified and the accuracy of measurement of the particles’ size is improved effectively.

Abstract: In this paper the entropy right-TOPSIS method is used, using entropy method to set weight is more effective than the use of subjective weighting method. The use of TOPSIS to determine evaluation scores can avoid the distribution of the number of samples and data limitations, reveals a different financial performance of listed companies the difference. From the evaluation results can be seen, N8, N5, N6, N7, N2 companies are the top five among the 12 listed companies. Their financial situation is better than other listed power companies.

Abstract: By using the FLUENT software, the flow and heat transfer properties of several elliptical tubes were numerically studied. The mathematical models of the tubes flow field were established. The implementation incorporated a SMPLE-based semi-implicit solution algorithm that was applied to iterating calculation. Results shows that the surface heat transfer coefficient, temperature difference between inlet and outlet were all higher than circular tube, when mass flux equal to at inlet of elliptical tubes and circular tube and wall temperature was invariable. Therefore, the elliptical tube is a kind of effective heat transfer enhancement element.

Abstract: Based on the in-cylinder hydrokinetics and by coupling the multidimensional model of in-cylinder combustion and verifying the rationality of the computational model, this thesis uses KIVA-3V program, which has been added a new subprogram, to provide a numerical simulation of the in-cylinder pressure, the temperature and the NO_X distribution and emission of a diesel engine in different injection advance angles, so as to analyze the change of in-cylinder pressure and temperature, and to find out the rules of temperature distribution, the NO_X distribution and emission condition. This thesis is of guiding significance to the better understanding of the performance of diesel engines and to the optimum design and research of the diesels.

Abstract: Pyrolysis and hydropyrolysis of Chinese Datong coal was carried out at temperature from 350 to 650°C,under pressure of 2Mpa in a fix-bed reactor. The product distribution was determined, and gas evolution of coal pyrolysis and hydropyrolysis was also studied. The experimental results shows that coal conversion and water yield increase with temperature increasing during both pyrolysis and hydropyrolysis; tar yield increase during hydropyrolysis with temperature from 350 to 650°C, but the highest tar yield during pyrolysis is at temperature of 550°C. At high temperature area, CO、CH₄ and C₂₊ has higher yield in hydropyroly than that in pyrolysis. The products distribution of pyrolysis and hydropyrolysis showed that the effect of H₂ on coal thermal conversion only occurs at high temperature area.

Abstract: The principle of inking system in sheet-feed printing press is introduced. Some tests on ink thickness are performed and the experiment results shows that in the traditional press, some inherent defects cause serious quality problems. The application of shaft-less drive technology to printing press is introduced and the drive principle of inking rollers of printing press and is explained. Synchronization control method of rollers is put forward, and the shaft-less technology is applied to the inking roller. Control system of shaft-less roller press is constructed for four color printing. Mechanical zero and electrical zero can be reset and corrected. Slight asynchrony is allowed between inking rollers and cylinders for normal printing, and the speed difference between them can eliminate a kind of printing troublesome of ghosting when needed. Analysis shows that with this technology, the functions of press are extended. Furthermore, the results of calculation indicated that when printing the special products, the make-ready time for inking is shorten about 50% and the power consumption is decreased about 19.8 to 21.5%, so the efficiency of machine can be increased by a big margin and the power cost can be cut down obviously.

Abstract: The research has conducted a experimental research on the issues in modifier of flotation process in a molybdenum ore concentrating mill in Inner Mongolia. The results show that: when the raw ore is grinded into 61% -200 meshes, which is the same to the site production ore, the sorting index is optimum in neutral magma condition; and for dispersing agent, the sorting effect of sodium silicate is better than sodium hexametaphosphate, and the confirmed sufficient quality of sodium silicate is 300g/t.

Abstract: The paper firstly introduces the principle and mode of electromagnetic induction heating. Accordingly the basic equations of electromagnetic field and temperature field in the heating material are derived from Maxwell's equations and heat conduction differential equations. Then give an example of the electromagnetic induction heating. With the application of ANSYS software, the one-dimensional finite element model of the heating material is built. And numerically simulate it by the means of the electromagnetic field and temperature field coupling in the ANSYS software. The influence of the material's physical parameters changing with the temperature and significant skin effect in the electromagnetic induction heating are considered. So the results are correct and reliable.