Abstract: Status and development of preparing toner are introduced. Disadvantages on "melt mixing method" is analyzed. A new technology of preparing toner with situ suspension copolymerization on advanced mineral pigment as a base material is investigated. Quality control of toner and practicability of the new method are discussed.
Abstract: Mantle xenoliths occur widely in some strata of Cenozoic basalts in Changbaishan mountains, Jilin province. Sulfide phases are usually found in olivine and pyroxene of lherzolite, which can be identified into three typies:early sulfide grains, sulfide-melt inclusions and sulfides in fractures. Sulfide-melt inclusions occur as single-phase sulfide, sulfide-silicate melt, or CO2-sulfide-silicate melt inclusions. Early sulfide grains are mainly composed of pyrrhotite, but cubanite was found occasionally. Sulfide-melt inclusions are mainly composed of pentlandite, with small amounts of chalcopyrite and talnakhite. Sulfides in fractures are pentlandite without exception, which have higher Ni/Fe and (Fe+Ni)/S (molar ratio) than those of sulfide inclusions. Ni/Fe and (Fe+Ni)/S are gradually increased from early grains, sulfide inclusions to sulfides in fractures. These changes were not only controlled by temperatures and pressures, but by geochemistry of Ni, Fe and Cu, and sulfur fugacity as well.
Abstract: The influence of different flow of water and different temperatures on the pressure fall, the expanding rate of reverse washing and the rate of sedimetation for exchange resin are presented. The results show that flow resistance in resin level increases with flow velocity increasing and temperature falling. Re-verse washing expanding rate increases with reverse washing velocity increasing and temprature falling. Sedimentation rate increases with resin grain increasing and temerature rising.
Abstract: The effect of Si reduction and re-oxidation behavior during the smelting reduction process is experimental studied. It shows that the quantity of SiO developed varies with the temperature and coal com-position. By means of the coal selecting and the gun adjusting, the detrimental influence of the SiO2 reduction and re-oxidation behavior on smelting reduction operation may be alleviated.
Abstract: Blast furnace slag is a kind of metallurgical solid wastes. In order to make better use of it and enhance its additional value, Ca-α-Sialon-SiC powders were synthesized from blast furnace slag and some additives by carbothermal reduction and nitridition (CRN) based on thermodynamic analysis. The content of Ca-a-Sialon in the sintered samples was up to 81%. The synthesis process of CRN was optimized by Statistical Pattern Recognition (SPR) and Artificial Neural Network (ANN).
Abstract: Equilibrium constants of defect reactions, Gibbs free energies and formation enthalpies of defects in undoped, acceptor-doped and donor-doped SrTiO3 are presented on the bases of analysis of defect chemistry and corresponding reports. Thus, the concentration of point defects of the SrTiO3 can be calculated and predicted.
Abstract: The oxygen ion and aluminum ion self-diffusion parameters in alumina single ciystals were reviewed and assessed, and the diffusion mechanism was analyzed. The results suggest that:(1) In the temperature range from 1770 to 2100 K, oxygen self-diffusion coefficient in single crystal of undoped Al2O3 with impurities level of 30×l0-6~500×l0-6 (the content of Mg as well as Ti should be less than 30×10-6), under an oxygen partial pressure less than 1.O× 105 Pa, the formula of self-diffusion confficient and temperature can be obtained. The diffusivity of the oxygen self-diffusion in single crystal of undoped Al203 is insensitive to the variation of oxygen partial pressure and the diffusion direction. (2) In the temperature range from 1943 to 2178 K, aluminum ion diffusion coefficient in polycrystalline aluminum oxide is about 10-15 to 10-14 m2/s, the activation energy is about 477 kJ/mol. (3) The major impurity species in Al2O3 single crystal are TiO2 and MgO. Doping with titania will decrease oxygen self-diffusivity and doping with magnesium will increase oxygen self-diffusivity. Since the contents of other impurity species dissolved in Al2O3 are low, the influence of their presence on the oxygen self-diffusivity is not of significance. (4) The diffusion of aluminum and oxygen ions occurs through a vacancy mechanism.
Abstract: The test experiment on hot cycling of the 300 t ladle has been done in steel making plant of Bao Steel Corporation. The result of different segment has been worked out. The measures of improving efficiency of ladle hot cycling, such as shortening tiring period, keeping temperature by a cover have been proposed.
Abstract: The influence of cooling rate on the crystallization properties of mold fluxes was studied by WCT-2 Differential Thermal Analysis(DTA) balance and LEITZ optical microscope equipped with 1350CC heating stage. Increasing cooling rate, the crystallization temperature, crystallization ratio, and the size of crys-tal is reduced, and the morphology of crystal is also changed greatly.
Abstract: Based on the singular perturbation method and composite with the moving-grid method, a new perturbation numerical method is established to analyze the casting process. The results are in good agreement with numerical solutions and measured values, which has laid a theoretical basis for further analysis and para-meters control during the solidification process of billets in continuous casting moulds.
Abstract: Some electronic structure properties of the densities of energy states, Fermi Energies and Energy Gaps in the systems of RE4Cr2O9(RE=La,Pr,Nd,Sm,Gd,Dy,Ho,Er) are calculated by means of SCF-Xa-SW methods. Compared with the conductivity properties of RECrO3, the relations between the electronic structure and conductivities are studied. The result shows that,with the increase of the atomic number of RE, their densities of energy states increases (mainly due to f electrons) and the non-f electrons decreases gradually. Therefore the conductivity has no relation with that of f electrons of RE. This is the main reason that the conductivity decreases with the increase of atomic number of RE.
Abstract: The SCC susceptibility of steel 16Mn in nitrate solution was studied. The results showed that the steel 16Mn is more susceptible to SCC when the temperature increased and the polarization by applied potential will accelerate (anodic polarization or retard (cathodic polarization the process of SCC. The steel 16Mn is susceptible to SCC in nitrate environment, which is controlled by electrochemical process.
Abstract: The compound artificial synovia was prepared according to the table of orthogonal test design, which three factors-Hyaluronic Acid, γ-globulin and Lα-DPPC and five levels were considered. A pendulum type friction test made by author was used to determine the friction coefficient of two kinds of tribology slide pairs-PVA-H/PVA-H and PVA-H/316L S S lubricated by the compound artificial synovia, the appropriate properties of three factors in the compound artificial synovia selected were ascertained finally.
Abstract: The experimental study on the familiar 6OSi2Mn and lCr18Ni9Ti materials for rheorolling in the semi-solid state using the directly rolling system designed by oneself has done. Experimental results show that the segregation of liquid occurs when the semi-solid slurry is rolled, which influence the microstructure and mechanical properties of workpiece under room temperature. The globular solid particles don't present plastic deformation unless high solid fraction. At the same time, the mechanical properties of workpiece is good while the semi-solid slurry is rolled a pass and no other treatment. Surface cracks found on the surface of workpiece are caused by temperature difference between the slurry and the roller or other factors. And it is necessary to restrict the flow of the slurry in the width direction during rolling for avoiding edge cracks.
Abstract: Based on the Peng's and Chen's works, finding the appropriate technical parameters for forging and rolling, Fe3Si based alloy sheets of about 1.5 mm in thickness were obtained successfully by the traditional forging and double warm rolling. The grains of the cast structure are larger and not uniform. The uniform tine equiaxed grains form by recrystallization of forging structure. The microstructure becomes elongated after rolling.
Abstract: Confocal Fabry-Perot Interferometer (CFPI) is the demdulation device for surfce ultrasonic vibration detection. Its sensitivity and stability play very driportant roles in whole system. In this paper, a new detection system is introduced. By using both conjugate rays, the system sensitivity is doubled. Moreover, a single chip microcomputer (MCS-51) feedback control loop is applied to stabilize the working point at optimum position. The system has performed in detecting piezoelectric ultrasonic on surface of an aluminum sample.
Abstract: Grinding teeth burn and crack is the key problem that affects the quality of a gear. The sort and reason of grinding burn were analyzed. Based on the characteristic of the coned shape grinding wheel, the factors of affecting the depth of the thermal damage layer were found. By means of regression design, the relational formula between the depth of the thermal damage layer and parameters of technology was found. It is very useful to analyze the errors such as burn, crack and so on.
Abstract: Since decoupling technological parameters, Mp, Mw, Q, Kp and Kw, of the combined shape and gauge control system vary widely as the rolling condition by theoretical analysis of developed mathematical models and industrial experiment on the production mill, this paper develops mathematical models by FEM for calculating decoupling technological parameters of 1 700 mm hot strip mill. The calculated parameters are applied in the proudction mill and proved to be effective.
Abstract: The process of emulating, choosing mathematics model, and the result of the emulating of the equal-roller-distance leveling operation straightening process were disscused.
Abstract: On the basis of experimental methods, the effect of powder coal granularity on its combustion is studied. The flame temperature of powder coal combustion, the combustion effectiveness of powder coal granularity and the relation between the emission of NOx in the gas and the granularity of powder coal are obtained. These valuable experimental parameters for the research on utility of powder coal and the control pollution of waste gas are provided.
Abstract: One of the method of curbing plate bending in jobbing-sheet rolling process was studied. The relationship between plate bending curvature and offset and rolling line height was analyzed. The optimum value of rolling line height could be decided. The value rolling line height has been adopted in practical production and is proved to be very effective.
Abstract: On the basis of analyzing the problems of the product design, the probability approach to study the principle and method for product quality design is used according to indeterministic information of design, and the applied software of design QC-ROD is developed. A hidden peril of quality will be as far as possible removed or no defective product will be obtained through these design techniques in a design process. So it has very important meanings to popularize and apply this method to develop and design a new product for the market competition.
Abstract: An efficient algorithm is devised and analyzed for Two-Dimension Heat-conduction equation. It is proved that the ETF-FDS-MG(Extended Trapezoidal Formula Finite Difference Scheme Multigrid) method is third-order in time, two-order in space, unconditionally stable and high order convergent. Numerical example confirms the ETF-FDS-MG method is superior to the FE-MG(Finite Element Multigrid) method.
Abstract: The features of constringencies of deterministic pattern, chaotic pattern and random pattern are analyzed. A wavelet neural network is constructed and its learning algorithm is studied. The difference of increase trend of neurons in wavelet network are used to reflecting the difference of constringencies of the pat-terns above mentioned. Owing to there differences, the chaotic pattern can be distinct.
Abstract: An indexing system for Phase diagram of electrolyte based on mulimedia and internet technique was introduced. By using Web technique and dynamic drawing softwares, the system may regenerate many binary ternary and quadrary component phase diagram as well as curves of properties for these systems. The system is consisting of two main functions, one is to redraw 2-D diagrams from literatures, and the second is dynamic showing of three dimensional phase diagram of electrolyte. The system can run on the Internet.
Abstract: In order to stabilize the unstable orbits of chaotic systems, a new intelligent control method, which is combined the state-delayed feedback PID algorithm with the adaptive PSD algorithm based on single neuron, is presented. When this method is used for the stabilization of chaos, the parameters of the control system is governed adaptively by way of the self-learning function of the neuron. The simulation results demonstrate that this method has many strongpoints for its wide range of application, short transition time of stabilization and strong anti-inference ability.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
