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15 March 2005, Volume 26 Issue 3 Previous Issue    Next Issue
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Analysis of price difference between different priorities of multi-user non-linear network systems Yue, Xiao-Ning (1); Jing, Yuan-Wei (1); Zhan, Xiu-Hua (1) 2005, 26 (3):  205-208.  DOI: - Abstract ( 174 )   HTML   PDF (156KB) ( 508 )   Analyzes quantitatively the relationship between Nash balance points of multi-user non-linear network systems and the price difference between different priorities of these systems. Develops a mathematical model in terms of user's surplus function and relates it with the surplus function of the network systems. Difference method is used to illustrate the effect of each and every price difference between priorities of the systems when reaching Nash balance point, and a quantitative method is given to determine the position of a balance point from the range of values to take for each and every price difference between priorities, thus giving the condition on which the network systems will come up to Nash balance with Pareto optimality. A numerical example is given to show how to analyze a two-user and two-priority network system. Discusses the effect of price difference between priorities on the service selection for users and the balance of systems. The effectiveness of the method proposed is thus verified. References | Related Articles | Metrics

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Optimizing control parameter settings in RE extraction/separation process by CBR Yang, Hui (1); Wang, Yong-Fu (1); Chai, Tian-You (1) 2005, 26 (3):  209-212.  DOI: - Abstract ( 217 )   HTML   PDF (205KB) ( 810 )   The difficulty of modeling an extraction/separation process of rare earth metal to implement its automatic control is mainly lacking an exact mathematical description. An intelligent optimal control method is therefore proposed using case-based reasoning (CBR) technique to preset relevant process parameters, such as the flowrates of extractant, feed liquid and scrubing solution, with the aim of controlling optimally the purity of products from the outlets at both ends to up to the target indices. The extraction/separation process can thus be understood in depth from a lot of historical data accumulated in previous cases so as to build a case database summarizing the typical operation conditions. Discusses the case retrieval, adjustment, revision and store in CBR process. The method proposed has been applied to an HAB extraction/separation process control for yttrium (Y), and its effectiveness was proved evident. References | Related Articles | Metrics

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Guaranteed cost resiliently control of uncertainty singular systems with state delay Shu, Wei-Ren (1); Zhang, Qing-Ling (1) 2005, 26 (3):  213-216.  DOI: - Abstract ( 174 )   HTML   PDF (159KB) ( 460 )   The problem of guaranteed cost resiliently control was studied via memoryless state feedback for a class of uncertainty singular systems with state delay. The sufficient condition is given in term of linear matrix inequalities (LMIs), under which the resultant closed-loop descriptor systems are of not only the quadratic stabilization but the upper bound of the cost function. Moreover, the guaranteed cost resiliently controller can be obtained in terms of the solutions to LMIs. The designed resiliently controller can make the closed-loop systems generalized quadratic stability and the closed-loop cost function value has an upper bound. An example is given to illustrate the effectiveness of the proposed method. References | Related Articles | Metrics

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Method based on physical model to restore degraded weather images and its application Dong, Hui-Ying (1); Fang, Shuai (1); Wang, Xin-Wei (2); Xu, Xin-He (1) 2005, 26 (3):  217-219.  DOI: - Abstract ( 209 )   HTML   PDF (222KB) ( 892 )   A simple depth-cueing method to restore a degraded weather image is suggested, based on the dichromatic atmospheric scattering model developed as shown. It can be used to eliminate the effect of bad weather on an image with few extra information provided by user and without any information needed on depth and weather. For the weakened intensity of image due to the elimination, the histogram method is used to adjust so as to enhance the intensity of the image. The results of a simulation done on MATLAB platform show that the method suggested is quite good at restoring degraded weather images. References | Related Articles | Metrics

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Approach to fast image segmentation based on 2-D histogram Dong, Li-Ju (1); Yu, Ge (1) 2005, 26 (3):  220-223.  DOI: - Abstract ( 272 )   HTML   PDF (197KB) ( 848 )   An efficient approach to image segmentation is proposed on the basis of 2-D histogram of images, to achieve optimized segmentation effect on grey-level histograms. The algorithm proposed iteratively minimizes a weighted sum-of-squared-error objective function, thus optimizing finally the image segmentation of gray levels on the histogram. With regard to the effect of image segmentation on 2-D histograms, this method is similar to either Otsu's method or entropy's method, but has much more advantages in time occupancy. Therefore, this method has more applications, especially in real-time recognition tracking and surveillance systems. References | Related Articles | Metrics

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PSO-based decoupling PID control using wavelet neural network for strip flatness/gauge Wang, Jian-Hui (1); Huang, Min (1); Gu, Shu-Sheng (1) 2005, 26 (3):  224-227.  DOI: - Abstract ( 225 )   HTML   PDF (196KB) ( 639 )   Automatic flatness control (AFC) and automatic gauge control (AGC) are interacted and coupled with each other. A novel decoupling PID control method for AFC-AGC is presented. The α-order time-delay inverse systems based on wavelet neural networks (WNN) are built and used as compensators for input/output decoupling of AFC and AGC. Then, PID controller is adopted to control the SISO systems. Theoretical analysis and numerical simulations show that the decoupling method proposed is able to decouple completely. The parameters of PID are adaptively adjustable for non-linear system with time-delay if using particle swarm optimization (PSO) algorithm. Simulation results show that the control system is simple and effective and has good performance of adaptively tracking target and resistance to disturbances. It is superior to conventional decoupling PID control to improve the accuracies of strip flatness and gauge. References | Related Articles | Metrics

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Network security information fusion based security event analysis and prediction model Peng, Xue-Na (1); Zhao, Hong (1) 2005, 26 (3):  228-231.  DOI: - Abstract ( 329 )   HTML   PDF (304KB) ( 1323 )   A model is developed fusing all network security information together for analyzing and predicting security events to meet the requirements of network security management. The model can verify, aggregate and correlate with the network security information that comes mainly from IDSes, with the rest from various security devices and the log systems of key hosts. The model can also evaluate the security status of the target network according to network security mission, and analyze the key threat to the network. Besides, it can predict possible security event in future according to a certain attack scenario and realize the latent threat as soon as possible, which means winning valuable time for effective response. References | Related Articles | Metrics

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Coating analysis of galvannealed high strength IF steel Zhang, Li-Yang (1); Li, Jun (2); Zuo, Liang (1) 2005, 26 (3):  232-235.  DOI: - Abstract ( 307 )   HTML   PDF (205KB) ( 985 )   To investigate coating powdering resistance of galvannealed steel, coating thickness, coating Fe content, coaling Al content and coating phase distribution of different galvannealed high strength IF steels were investigated with glow discharge spectrometer (GDS-750A), X-ray diffraction (XRD) and scanning electron microscope (SEM-S4200). It was indicated that for the investigated galvannealed high strength IF steel when the coating thickness was high and the coating Al content was low, the coating powdering quantity was larger. It was also indicated that when the surface coating and sub-surface coating were mainly composed of loose δ1 phase, the coating powdering resistance was much better than that of coating with almost all of compact particulate δ1 phase in the surface coating. References | Related Articles | Metrics

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Recent progress of thermoelectric materials Li, Ying (1); Zhang, Li-Hua (1); Jiang, Mao-Fa (1) 2005, 26 (3):  236-239.  DOI: - Abstract ( 283 )   HTML   PDF (209KB) ( 896 )   Introduces briefly the basic structure and properties of the NaxCo2O4 oxides as thermoelectric materials and reviews the ways to improve their thermoelectric properties. Discusses both the effects of Na-site doping (with K, Sr, Y, Nd, Sm, Yb, Ca and Ag as substituents) and Co-site doping (with Ti, Rh, Mn and Ru as substituents) of the materials NaxCo2O4. It is found that the effect of different elements on Na-site doping is different from that on Co-site doping. However, the investigation on the doping of NaxCo2O4 is worthwhile with prospective applications. References | Related Articles | Metrics

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Effects of impurities and process technology on properties of oxygen-free copper contact wire Liu, Qiang (1); Cui, Jian-Zhong (1); Xu, Guang-Ming (1); Liu, Xiao-Tao (1) 2005, 26 (3):  240-243.  DOI: - Abstract ( 419 )   HTML   PDF (205KB) ( 1175 )   The effects of impurities and process technology on the properties of oxygen-free copper contact wire were studied. The results showed that the resistivity of contact wire is affected by Fe evidently and will become unqualified when w[Fe] exceeds 20×10-6-30×10-6. On the other hand, the contents of S, H and O affect the tensile strength and resistivity unobviously, but affect the plasticity evidently. The plasticity will lower when w[S], w[O] or w[H] exceeds 38×10-6, 8×10-6 or 0.6×10-6, respectively. The S content depends on the electrolytic copper as raw material, while the Fe, O, and H contents depend on the process technology. It implies that quality electrolytic copper should be chosen in combination with careful operation and both the raw and ancillary materials, and devices to use should be dried or baked up. In addition, the melting furnace, holding furnace and launder should all be covered and deoxidized to prevent the molten copper from oxidizing and suction. References | Related Articles | Metrics

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Numerical simulation of magnetic field distribution during electromagnetic casting of Al-alloy hollow billets Wang, Zhe-Feng (1); Cui, Jian-Zhong (1); Piao, Feng-Xian (2) 2005, 26 (3):  244-247.  DOI: - Abstract ( 193 )   HTML   PDF (223KB) ( 659 )   Distribution of magnetic field in electromagnetic continuous casting process of Al-alloy hollow billets is studied by way of numerical simulation. A two-dimensional axis-symmetric finite element model is established including relevant water-cooled core, outer mould, ingot, inner and outer induction coils. The spatial distribution of magnetic induction is determined by solving the differential equations of magnetic vector potential. Calculated results show that during electromagnetic casting the inner and outer induction coils interact with each other, and the distribution of magnetic induction is found more homogeneous when the outer induction coil current is set to about a half of inner induction coil current. The frequency and phase of coil current are important parameters during electromagnetic casting of hollow billets, the magnetic induction on inside wall surface of pipe increases notable if increasing appropriately the frequency, while the phase will affect the magnitude and direction of magnetic induction gradient. References | Related Articles | Metrics

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Linear yield criterion with equal covered area to Mises yield locus' coverage in Haigh Westergaard stress space Zhao, De-Wen (1); Fang, Qi (1); Liu, Xiang-Hua (1); Wang, Guo-Dong (1) 2005, 26 (3):  248-251.  DOI: - Abstract ( 256 )   HTML   PDF (2176KB) ( 700 )   Let the area covered by Mises yield locus on the π-plane be equal to the area coverage of a non-equiangular but equilateral dodecagon and the two areas be overlapping to determine the six apexes of the new yield locus. Then, the lines connecting these apexes and six inscribed points are defined as the new yield criterion loci or locus as a whole. The linear equation of the new locus in Haigh Westergaard stress space has been deduced. It is proved that the new yield locus is approximate upmost to that of Mises yield criterion and is called MA(mast adjacent) yield criterion for short, and the apex angle of the new dodecagon is 159.836° with the apex angle of circumscribed hexagon equal to 140.164°. The mean error of deviator stress vector modulus on the π-plane between Mises and MA criterions is zero. Furthermore, the plastic power rate for unit volume is also given. References | Related Articles | Metrics

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Calculation of component activities in Si-Ca, Si-Ba and Ca-Ba binary alloy melts Jiang, Zhou-Hua (1); Liu, Yang (1); Li, Yang (1); Liang, Lian-Ke (1) 2005, 26 (3):  252-255.  DOI: - Abstract ( 350 )   HTML   PDF (929KB) ( 803 )   Based on Miedema for calculating the formation heat of binary alloy system, the activity of each and every binary system in the Si-Ca-Ba alloy system was calculated at 1623 K combining with related thermodynamic data. The calculation results showed that although the activity of Si-Ca alloy confirms fairly with measured data, the activity curves of Si-Ca and Si-Ba alloy melts show relatively great negative deviation from the idea melt. It means that there is a strong interaction between Ca and Si atoms and between Ba and Si atoms. In comparison, the Ba-Ca melt comes nearer to the idea melt in the whole range of composition, and the interaction between Ca and Ba atoms is weaker. References | Related Articles | Metrics

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Effect of SiC additive on properties of carbon-containing CaO-ZrO2 refractory Chen, Min (1); Wang, Nan (1); Yu, Jing-Kun (1); Zou, Zong-Shu (1) 2005, 26 (3):  256-259.  DOI: - Abstract ( 219 )   HTML   PDF (338KB) ( 435 )   SiC was added to carbon-containing CaO-ZrO2 complex refractory to investigate its effect on the antioxidation of the refractory. The results showed that SiC can improve the antioxidation in two ways as follows: The added SiC deoxidizes CO to C so as to make up partially for the mass loss of carbon due to oxidation. Furthermore, it improves the antioxidation of the refractory by means of modifying its microstructure after heating at high temperature. The SiC additive obviously decreases the percentage of large size pores in the refractory to suppress the diffusion of ambient oxygen into the refractory. Especially the antioxidation of the refractory can be significantly improved because a dense belite (2CaO·SiO2) layer forms near the surface of the refractory as a protective coating. References | Related Articles | Metrics

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Synthesizing sulphides by temperature gradient method Liu, Tao (1); Yu, Jing-Kun (1); Yuan, Yu-Hao (1) 2005, 26 (3):  260-262.  DOI: - Abstract ( 218 )   HTML   PDF (139KB) ( 749 )   MgS, TiS2, ZrS2 and WS2 were synthesized by temperature gradient method using Mg, Ti, Zr, W and sublimed sulfur as raw materials. The mineral compositions of the synthesized sulfides as above were determined by X-ray diffraction. Relationships among the evaporating loss of sublimed sulfur and such parameters as volumetric size, synthesizing temperature and compression strength of the synthesized sulfides were studied. The results showed that the maximal evaporating loss of sublimed sulfur is 1.15 g in the synthesizing process under the same experimental conditions. Then, based on the evaporating loss of sublimed sulfur, the temperature gradient and heating rate in the synthesizing process were controlled, to synthesize safely large quantities of MgS, TiS2, ZrS2 and WS2 with their masses up to 56.37 g, 112.00 g, 155.36 g and 247.97 g respectively. References | Related Articles | Metrics

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Dissolubility of potash fertilizer synthesized with desiliconized slag Shen, Jian-Guo (1); Guo, Chun-Yuan (1); Yu, Jing-Kun (1); Jiang, Mao-Fa (1) 2005, 26 (3):  263-265.  DOI: - Abstract ( 257 )   HTML   PDF (157KB) ( 487 )   The dissolution rate of potassium in the potash fertilizer synthesized with desiliconized slag under different conditions was determined and discussed. The results showed that the dissolution rate of potassium in water is less than that in aqueous citric acid solution and much less than that in the widely used fertilizer of potassium sulphate. The fact shows that the potash fertilizer synthesized with desiliconized slag has an obvious property of slow release. The effects of the amount of K2O addition, holding time and oxide additives on the dissolution rate are not obvious, though the heating temperature and cooling mode affect it notably. References | Related Articles | Metrics

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Microwave synthesis of LiCoO2 and its characterization Yu, Yong-Li (1); Zhai, Xiu-Jing (2); Wang, Yun-Xia (2); Yao, Guang-Chun (2) 2005, 26 (3):  266-269.  DOI: - Abstract ( 206 )   HTML   PDF (215KB) ( 872 )   LiCoO2 powder as cathode material in lithium ion battery was synthesized by microwave heating using Co2O3 and LiOH·H2O as raw materials. The effects of microwave power output, heating time and holding time on the microstructure and composition of synthesized powder were investigated. XRD results show that the samples of single-phase layered LiCoO2 can be obtained with lattice constants confirming with reference values if the power output is 360 W and heating time and holding time are both 10 min. SEM images show that the LiCoO2 samples prepared under such conditions are featured with clear and smooth grain boundaries and evenly distributed grain size which is about 5 μm on an average. The microwave synthesis mechanism of LiCoO2 is discussed in combination with XRD results, indicating that the whole synthesis process is a two-step reaction. In addition, TGA-DTA tests were carried out for the raw materials. References | Related Articles | Metrics

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Effect of synthesizing process of NiFe2O4 on mechanics properties and conductivity of inert anode Jiao, Wan-Li (1); Zhang, Lei (1); Yao, Guang-Chun (1); Liu, Yi-Han (1) 2005, 26 (3):  270-273.  DOI: - Abstract ( 196 )   HTML   PDF (813KB) ( 527 )   The reaction-sintering thermodynamic conditions in the synthesizing process of NiFe2O4 with NiO and Fe2O3 as main raw materials were investigated, and the bending strength and high-temperature conductivity of the synthesized spinel inert anode samples sintered secondarily on different conditions were measured. The results showed that the thermodynamic conditions are available to the solid-phase reaction of NiO with Fe2O3, and the solid-phase reaction goes on with the densification process though the former ends up earlier than the later. If an inert anode is synthesized from powdered material at 900°C without precompaction for 6 hours, then crushed up and pressed and sintered secondarily, the bending strength and high-temperature conductivity of the sample are maximum with best sintered performance provided. It was found that the crushing process is also very important to improve the activity of powdered material, as well as improving the sample's conductivity and mechanic properties. References | Related Articles | Metrics

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Fabrication aluminum foam with fly ash as viscosifier Luo, Hong-Jie (1); Yao, Guang-Chun (1); Liu, Yi-Han (1); Zhang, Xiao-Ming (1) 2005, 26 (3):  274-277.  DOI: - Abstract ( 178 )   HTML   PDF (199KB) ( 607 )   Closed-pore aluminum foam was fabricated by way of adding fly ash first as viscosifier and TiH2 powder as foamer into molten aluminum then stirring it. The results showed that low density and high porosity feature the aluminum foam when the amount of added fly ash is ranging from 3% to 5%, and the aluminum foam will have a good cell structure, i.e., a relatively plain relationship curve among the density and porosity of aluminum foam and particle size of fly ash, if the fly ash particle size is ranging from 61 μm to 147 μm. Using fly ash as viscosifier instead of Ca to increase the viscosity of aluminum melt will not only reduce the cost but also provide high strength for aluminum foam. References | Related Articles | Metrics

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Influence of compound CaOTiO on formation of anhydrous calcium aluminosulphate Zhang, Ju-Song (1); Shui, Zhi-Tong (1); Hui, Zhi-Feng (2); An, Hui-Yong (2) 2005, 26 (3):  278-281.  DOI: - Abstract ( 291 )   HTML   PDF (205KB) ( 728 )   By means of chemical analysis, thermogravimetry (DTA. TG) and XRD analysis, the influence of compound CaOTiO or CT on the formation of anhydrous calcium aluminosulphate (C4A3S¯) was investigated systematically. The result showed that the compound CaOTiO has almost no effect on the secondary dehydration of dehydrate gypsum as one of the raw materials of C4A3S¯. With the increasing dosage of CT, the activation energy in the decomposition reaction of calcium carbonate gradually lower in value to facilitate calcium carbonate decomposition. Furthermore, the initial synthesizing temperature of calciume drops with the amounts of free gypsum and f-CaO decreasing gradually and the synthesized amount of C4A3S¯ increases. All these facilitate CT the gypsum decomposition with temperature rising. References | Related Articles | Metrics

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Two-steps electroless nickel plating of magnesium alloys Li, Jian-Zhong (1); Shao, Zhong-Cai (2); Hao, Jian-Jun (1); Tian, Yan-Wen (1) 2005, 26 (3):  282-284.  DOI: - Abstract ( 268 )   HTML   PDF (167KB) ( 634 )   The two-step electroless nickel plating (TSENP) of magnesium alloys using NiSO4·6H2O as the main salt was introduced. The morphology, composition and phase structure of TSENP coatings were investigated by means of Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Diffraction (XRD). In addition, the coating growth rate was tested through weighing by electro-balance and the bonding strength between coating and substrate was evaluated through file-checking. The results showed that the plating of magnesium alloys with NiSO4·6H2O solution as the main salt, i. e., the 2nd step should be carried out successively 4 minutes after the direct land electroless nickel plating (DENP). It was verified that the coating growth rate of single DENP is lower than that of TSENP, the sheeny TSENP coating is of high-phosphorus amorphism with higher corrosion resistance and bonding strength than DENP coating. The P content in weight is effectively distributed in the coating. In short, TSENP will not only decrease the cost but improve the applicability. References | Related Articles | Metrics

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Catastrophe in fault developing process of rotor system Liu, Shu-Ying (1); Song, Xue-Ping (1); Wen, Bang-Chun (1) 2005, 26 (3):  285-288.  DOI: - Abstract ( 266 )   HTML   PDF (249KB) ( 1170 )   Characteristics and geometrical description of catastrophic fault and the formation mechanism of faults occurred in mechanical system are introduced and analyzed. Mathematic descriptions are given to catastrophic faults especially in the state of system vibration based on nonlinear and catastrophe theories. The equations of a bifurcation set are derived, by which a critical value for catastrophic amplitude is obtained. When an excitation amplitude exceeds the critical value, a catastrophe will occur in the state of system vibration. So, the critical value can be used to diagnose and forecast the catastrophe phenomena in a mechanical system in order to restrain the occurrence and development of fault with effective measures taken. References | Related Articles | Metrics

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Nonlinear response and chaos of two-span rotor-bearing system with crack fault Luo, Yue-Gang (1); Li, Xiao-Peng (1); Wen, Bang-Chun (1) 2005, 26 (3):  289-292.  DOI: - Abstract ( 271 )   HTML   PDF (265KB) ( 795 )   A dynamic model was set up for a cracked two-span rotor-bearing system to investigate the influences of crack and its angular orientation on nonlinear dynamic characteristics of the system. The periodical, quasi-periodical and chaotic motions were found in the system response which will enter into chaos by a doubling-period or intermittent bifurcation route and leave chaos by a doubling-period inverse bifurcation route. Such frequency multiples as 1/3, 1/2, 2/3, 1 and 2 were found within the sub-critical speed range, but the peak values of double or higher frequencies obviously decrease within the super-critical speed range. The influence of cracking angle β on the dynamic behavior of a cracked rotor is important insomuch as the quasi-periodical, periodical and/or chaotic motions in system response will occur along with different cracking angles in the vicinity of the area where ω=3ω0/2. It therefore requires more attention to pay when a fault diagnosis is doing for a multi-span rotor system running at a super-critical speed. References | Related Articles | Metrics

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Numerical simulation on coupled solid-gas flow in failure process of gaseous coal and rock Xu, Tao (1); Yang, Tian-Hong (1); Tang, Chun-An (1); Tang, Shi-Bin (1) 2005, 26 (3):  293-296.  DOI: - Abstract ( 270 )   HTML   PDF (273KB) ( 717 )   Based on the seepage theory of gas flow in coal seams and elastic theory of coal deformation and combining them with the relationship equations between gas permeability and damage, a mathematical model of coupled solid-gas flow in coal and rock formations in the failure process of coal and rock was established. Using the gas pressure incorporated RFPA code, the mining induced instantaneous outbursts, gas pressure changes before and after outbursts, gas drainage and associated characteristics of gas permeability and gas pressure of coal seam during mining were numerically simulated. The results offer some theoretical indications to further investigate the mechanisms of instantaneous outbursts and gas drainage and give some precautions to prevent their occurrences in collieries. References | Related Articles | Metrics

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Low-temperature effect on deformation behavior of laminated rubber isolators You, Shi-Qi (1); Liu, Bin (1); Lou, Yong-Lin (2) 2005, 26 (3):  297-299.  DOI: - Abstract ( 235 )   HTML   PDF (122KB) ( 1005 )   To understand in depth how low temperature affects the deformation behavior of the laminated seismic isolation devices made of rubber-steel plate, two kinds of those isolators were investigated experimentally in Shenyang where the weather is quite cold in winter for comparison. The test proved that low temperature affects prominently the vertical compressive stiffness, while its effect on horizontal stiffness varies with the quality and manufacturing process of the laminated rubber. Moreover, the horizontal stiffness rises with increasing compressive stress, with the horizontal stiffness variabilities of the two laminated rubber isolators under to-and-fro horizontal load revealed. An advice is thus given that the vertical compressive stiffness and horizontal stiffness should be taken into account when designing and using laminated rubber isolators. References | Related Articles | Metrics

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Backward analysis of physical and mechanical parameters of surrounding rock of Hanjialing tunnel Hao, Zhe (1); Wan, Ming-Fu (1); Liu, Bin (1); Chang, Chun (2) 2005, 26 (3):  300-303.  DOI: - Abstract ( 281 )   HTML   PDF (260KB) ( 932 )   A backward analysis of physical and mechanical parameters of surrounding rock was newly developed, based on differences method, orthogonal design and artificial neural networks, where the different parameters were chosen according to orthogonal design. The related analytical samples for neural networks were given by FLAC calculation results. With the samples trained, the structure and learning parameters of networks were optimized. The physical and mechanical parameters of surrounding rock of Hanjialing tunnel were analyzed backwards by trained results and the on-the-spot surveyed data. The results satisfied the demand of precision. References | Related Articles | Metrics

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On the antagonism against of heavy metals to biosorption of Cu2+, Pb2+ and Hg2+ by Gordona amarae Zhou, Dong-Qin (1); Zhu, Yi-Min (1); Wei, De-Zhou (1) 2005, 26 (3):  304-306.  DOI: - Abstract ( 341 )   HTML   PDF (113KB) ( 707 )   The inducible culture of Gordona amarae was carried out by such heavy metal ions as Cu2+, Pb2+ and Hg2+ and studied. The result showed that all of these ions can foster the strain to enhance the activation of adsorption of Pb2+ and Hg2+, with no evident adsorption of Cu2+ observed but microbiological antagonism against Cu2+ found when adding Cu2+ of which the concentration is 5.72 mg/L in the culture medium, i. e., the rate of adsorption of Hg2+ increases from 39% to 98% but that of Cu2+ decreases from 51% to 35%. Such a difference leads to the adsorption process to be selective. All these indicate that the selectively inducible culture is an effective way to the biosorption of heavy metal ions in industrial waste-water treatment. References | Related Articles | Metrics