Abstract: By means of in-situ tests, the engineering features and charateristics of pile-soil stress ratio have been considered after composite foundations of Dry Jet Mixing method piles are loaded, and ways how to get bearing capacity have been suggested. According to deformation and failure of DJM pile, the mechanism of deformation and failure of DJM ground and its method of designing and calculating have been analyzed.
Abstract: Investment in mining projects is influenced with many uncertainties such as coast, revenue etc. Traditional mining projects evaluation method, NPV, cannot be involved these uncertainties. Based on Option Pricing Theory(OPT), prices of mining outputs are modeled and incorporated into the analysis. Under consideration of uncertainties of mining costs and revenue, an option pricing model, a helpful approach and quantitative tools to the mining project evaluation, is developed.
Abstract: A compound used as the collector and bubbler in coal flotaion was developed. This flotation reagent has more effective selectivity Compared with the conventional flotation reagents, the new flotation reagent is quite obvious to decrease the ash content of fine coal, and effective to save oil. A new sort of absorbing model was introduced. It is different from conventional model and the selectivity of the new kind of reagent was explained by this model.
Abstract: Using manganese nodules as immobilized carrier, in an air-lift loop reactor the investigation on comparing immobilized carrier to disposal dye wastewater with non immobilized carrier was carried out. It is proved that with nodules as immobilized carrier to degradation organisms in dye wastewater, are effecitivity the color depriving character of immobilized microbe rely on adsorption and bio-degrading, biological oxygen demand(BOD), chemical oxygen demand(COD), suspended solid(SS) and color degree can be largely removed, and the benzene can be destroyed. The treated water can be applied to culturing microbe. It's Practicable to dispose dye wastewater with immobilized microbe.
Abstract: The temperature field of some usual coolers of blast furnace was studied by the use of the computational heat transfer. The arrangement of the cooling apparatus on blast furnace is given by the temperature distribution of the cooper stave, r-shaped stave and the cooling system combining with plate and stave on the different height of blast furnace. It is fit to fix the cantilever on the upper stack, the cooler with cooling plate.
Abstract: A pilot experiment of hot coal gas filtration, which using sintered metallic woven mesh as filter, is completed and the whole experiment process is controlled and detected by computer. The test results show that the new developed hot gas filtration system can be used at a temperature range of 550 ℃-600℃ while the filtration efficiency is 99.9%. The dust contentration of the gas after the filtration is below 10 mg/m3. So the hot gas filtration system can be used in the oxygen blast furnace process.
Abstract: Electro-pulse treatment was first used in bearing steel-GCr15 in laboratory. The experimental results show that the solidification structure is fined significantly through changing in electro-pulse voltage. Simultaneously it is found that the perlities are coarsened gradually under the electro-scanning microscope. The mechanism of EPM for improving the solidification structure has been discussed as well.
Abstract: The design of steelmaking, continuous casting and hot trip rolling integrative management is introduced, steelmaking subsystem is developed by means of software engineering; fuction structure and dynamic adjustment in steelmaking subsystem is offered. The result of simulation in lab is satisfied.
Abstract: It was observed experimentally that boron segregated to grain boundaries in Fe-40%Ni alloy during cooling process by boron autoradiograph technique and transmission electron microscope. The non-equilibrium segregation of boron on grain boundaries during cooling process from 1150 to 640 ℃ at 2 ℃/s shows three stages with different boron diffusion behaviors. The rich factors, widths of rich layer, depletion factors and widths of boron depletion zone were measured. The phenomena are discussed.
Abstract: In order to find the potential factors resulting in significant improvements in the lubricating behavior of a compound artificial synovia, which was prepared by ourselves with hyaluronic acid mainly and some proteins and phospholipids, the technology of Atomic Force Microscope (AFM) was used to observe the appearance of adsorbed film on material surface formed by the compound artificial synovia. The results show that adsorbed film exhibits lots of clear elliptical molecules only with the coexistence of y-globulin, Lα-DPPC and Hyaluronic Acid(HA), which means this kind of artificial synovia has a high resistance to shearing action and a significant improvement in boundary lubrication.
Abstract: The relationship between mechanical properties and nickel to iron ratios of W-Ni-Fe tungsten heavy alloys (WHAs) heat treated by solid-solution and quenching was studied. It was found that under solid-solution and quenching state the best nickel to iron ratio moved from 7/3 to 9/1. And it was also found that the tensile strength and ductility of resolutionized/quenched WHAs have the same changing tendency with increasing nickel to iron ratios, namely the mechanical properties increased with increasing nickel to iron ratios, reaching the maximum when the ratio approached to 9/1, and then decreased as the ratios getting higher. X ray diffraction and TEM analysis showed that there were brittle β(WNi4) phase precipitated in slow-cooled after sintering WHAs, and that the solid-solution and quenching heat treatment was effective to inhibit the precipitation of WNi4.
Abstract: The atomic disorder-Order transformation of NiMn thin films in the multilayers Si/Ta/NiMn/Al and Si/Ta/NiFe/NiMn/Al undergoing different number of annealing cycles at 300C for 5 hours was studied. Quantitative calculations of X-ray diffraction patterns show that annealing at a high temperature for several cycles can greatly facilitate the atomic ordering process of NiMn thin films. The relative amount of the ordered fct phase in NiMn thin films increases continuously with the increased number of annealing cycles. But for the multilayers containing a NiFe layer, the atomic ordering process of NiMn thin films is much slower compared with those without a NiFe layer. It is then evident that NiFe impedes the atomic ordering process of NiMn thin films.
Abstract: Titanium surface treatment has been carried out by using glow plasma oxygenizing for improving the hardness and wear resistance. The results indicate that there exist a certain realationship beetween the thickness of the oxidation layer and the oxygen partial pressure, temprature and time. Especially in the condition of hollow cathode dischage, the ion bombardment enhances ionization of oxygen, promotes the oxygen permeation and facilitates the formation of the oxide of low valence states of Ti. The hardness of TiO formed on the titanium substrate approachs that of TiN.
Abstract: The factors including enviroment, stress, materials and so on which haiving influence on stress corrosion of titanium alloy have been analyzed in detail. thee mechanisms of stress corrosion of titanium alloy including theories of active channel cracking, hydrogen embrittlement, chorine embrittlement are essentialized.
Abstract: With the aid of FE code MARC/Autoforge, two-roll cross-forging process was simulated, and the development of deformation and the law of metal-flow were studied. The result from the simulation is in good agreement with that of the physical simulations. The stress distribution in the work-piece and contact pressure between the work-piece and tool were also analyzed. It is discovered that in cross-forging process with only one strike of the press large lateral stretch stress exists, although the hydrostatic pressure is positively small in the center of the round.
Abstract: Introduce the expert system in kinematic project design of mechanism with complex functions. The expert system has intergrated knowledge in mechanism and relatively reasonable discursion and appraisement system. It can select the optimal project of mechanism which has one function or more than one function through original select, discursion, appraisement, and complex.
Abstract: Machine sound always carries information about the working of the machine. But in many cases, the sound has a very low SNR, so it is very difficult to make time-frequency analyse of sound signal. A denoising method based on wavelet technology is given. Based on wavelet decomposition, sound signal caused by mechanical diagnosis can be separated. Experimentation tests that this is an effective method to diagnose fault of rolling bearing comparing with other fault diagnosis methods.
Abstract: In order to find the reason of fault of the sintering fan, the characteristics of fix pad journal bearing and the stability of rotor-bearing system of sintering fan were analyzed. Using the device of CAMD-6100 rotor mechanical fault diagnosis, the reason of sintering fault diagnosis of sintering fan vibration was presented. The vibration signals from running fans were measured and analyzed. And it is found that the fault reason of running fans is unbalancing of rotors caused the vibration of fan.
Abstract: Through the ideal metal's relation of the force and bending moment at elasto-plastic state and the continuum mechanics, the mathematical equivalent among the distance of pressure-down, roller-distance and curvature is derived.
Abstract: During production of multi-filamentary Bi2223/Ag superconducting tape, annealing-cold pressing-annealing procedure is adopted. Pressure, pressing speed, friction coefficient and feed is acted as appraising target for studying, designed test projects by orthogonality. The results exhibited that influence of friction coefficient on the tape critical current Ic valve is very notable, the effect of pressure and feed is inferior, and the influence of pressing speed on the Ic valve is least.
Abstract: In order to resolve the main failure of the saw blade for metal cutting and extend its life-span, the influence of tooth shape parameters on the sawing force and the stress in blade tooth has been analyzed. Based on this work, the optimal tooth shape parameters have been given, which will make the sawing force and the stress in blade tooth lower.
Abstract: Similar theory and orthgonal experiment method are applied to the computer simulation. The liquid bulge forming process of a four-arm tube is analyzed by using the non-linear finite element program, MARC/AutoForge. The computer simulation result gives the effects of main process parameters during the forming process and the optimal process parameters such as balance force, friction, radius of round angle, and rate of velocityare obtained.
Abstract: Liquid-gas two phase flow can be characterized by its flow pattern signals, which are offen with some random noises. A general two phase flow experimental facility is set up to obtain flow pattern signals in two phase flow pipes. Flowing signals are decomposed with Daubechies wavelets to differ the noises from flow pattern signals. The denoised signals are quite well after reconstruction.
Abstract: The Local activity theory of the Cellular Nonlinear Network(CNN) has provided a powerful tool for studying the emergence and change of the dynamic behaviors of complex systems consisting of homogeneous media. The local activity principle is explainedand a set of theorems are set up for testing the local activity of three-port CNN and studying the life phenomena related to the growth of cellular tissues under cellmediated cytolysis.
Abstract: Network calculation is still an important question. By being compared with traditional methods, a new method is proposed. The new coputer resolution method uses a linear accumulation method which imitating human mind activity to resolve the network point by point. The results show that it gets a good result.
Abstract: New implementation of genetic algorithms (GAs) is developed for machine scheduling problem. Machine scheduling problem is abundant among modern manufacturing system. The performance measure of early and tardy completion of jobs is very natural as one's aim, which is usually to minimize simultaneously both earliness and tardiness of all jobs. As the problem is NP-hard and no effective algorithms exist, we proposed a hybrid genetic algorithms approach is deal with in order to adjust the crossover probability and mutation probability by fuzzy logic controller whereas the hybrid genetic algorithm does not require preliminary experiments to determine probabilities for genetic operators. The experimental results show the effectiveness of the proposed GAs method.
Abstract: A consulting tool for physical chemistry properties of aluminum electrolyte was introduced. The system is based on multimedia and Internet technology The user can draw all the properties including density, vapour pressure, liquid phase temperature, surface tension, viscosity, etc. on aluminum electrolyte, showing as equations or curves dynamically according to conditions input.
Abstract: Conflict is one of the most universal phenomena in our society. Conflict analysis and negotiation are of very importance in the field of the economy, politics and military, et al. In this paper, by means of integrating conflict analysis and the rough set theory, informatinn system is used to describe conflict problem and the concept of conflict matrix is put forward. In this way, based on the different definitions of conflict function and its threshold, methods of defining coalitions are presenied. For this model, strength - strategy analysis with threshold is given. And, the negotiation model based on the coalitions is put forward to reduce the degree of conflict. In addition, the different functions of reduct and conflict degree are clarified. The discernibility matrix Ⅱ and its description using conflict function are presented.
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
