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15 November 2014, Volume 35 Issue 11 Previous Issue    Next Issue
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Information & Control

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Robust FiniteTime H∞ Control for Stochastic Singular TS Fuzzy Systems XING Shuangyun， ZHANG Qingling， ZHU Baoyan 2014, 35 (11):  1521-1524.  DOI: 10.12068/j.issn.1005-3026.2014.11.001 Abstract ( 665 )   HTML   PDF (374KB) ( 630 )   Problems of finitetime stochastic stability and robust H∞ control for stochastic singular TakagiSugeno fuzzy systems with It type were investigated. Firstly， the stochastic singular system with bounded input noise was described by the TS fuzzy model. Meanwhile， definitions of finitetime stochastic stability and robust finitetime H∞ control of such systems were given. And then， based on the finitetime stability control theory， the sufficient condition for the existence of robust H∞ controller which could also satisfy finitetime stability was presented by analyzing a state feedback system. By constructing LyapunovKrasovskii function and applying linear matrix inequality， the description of a feasibility solution problem for the design of the controller was presented. Finally， numerical examples were given to illustrate the effectiveness of the obtained results. References | Related Articles | Metrics

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Multilead Analysis of T Wave Alternans in the ECG Using Particle Filtering SHE Lihuang， WANG Hongyan， WANG Mingquan， ZHANG Shi 2014, 35 (11):  1525-1529.  DOI: 10.12068/j.issn.1005-3026.2014.11.002 Abstract ( 571 )   HTML   PDF (584KB) ( 550 )   The current methods for analyzing the nonstationary and nongaussian TWA of automatically detecting and estimating T wave alternans (TWA) in multilead ECG have poor sensitivity to nonstationary and lowamplitude. The particle filtering (PF) method combined with joint analysis information was proposed to detect and estimate multilead TWA. According to a multilead TWA analysis scheme， a linear transformation using principal component analysis was processed on the preprocessed multilead STT complex. Then PFbased method was applied to each lead for TWA detection and estimation. To evaluate the proposed method， multilead PF method was compared to single lead PF and spectral method. The simulation results showed that the proposed method had the best performance on detection and estimation of TWA when the alternanssignaltonoise ratio was lower than -15dB. For nonstationary and nongaussian TWA， the proposed method had good robustness and high antinoise ability. References | Related Articles | Metrics

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A Hybrid Feature Selection Algorithm Based on Mutual Information and Memetic Framework to Optimize Traffic Classification MIAO Changsheng， YUAN Changqing， WANG Xingwei， CHANG Guiran 2014, 35 (11):  1530-1533.  DOI: 10.12068/j.issn.1005-3026.2014.11.003 Abstract ( 695 )   HTML   PDF (468KB) ( 601 )   Under the memetic framework， a new feature selection method combining filter and wrapper models was proposed. In the hybrid algorithm， classifier accruracy was used as fitness function to ensure global optimization， while joint mutual information was used as evaluation indicator to accelerate the process. The experimental results indicated that the proposed method outperformed the existing methods in computational efficeicecy and number of selected features. Applying this algorithm to traffic classification resulted in the improved accuracy with fewer features. References | Related Articles | Metrics

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An Effective Proportional Fairness Algorithm LIU Fulai， QIU Huizhen， ZHOU Qingping， DU Ruiyan 2014, 35 (11):  1535-1538.  DOI: 10.12068/j.issn.1005-3026.2014.11.004 Abstract ( 1942 )   HTML   PDF (455KB) ( 777 )   To solve the spectrum resource allocation problem of multiuser in cognitive radio system based on OFDM， a bit and power allocation algorithm was proposed. Firstly， the transmit power of secondary users was constrained to guarantee the communication quality of service (QoS) of secondary user. Secondly， the twostep method and the proportion gene were used to avoid the disequilibrium of spectrum resource allocation. Finally， the algorithm was simulated and the results of the allocation about secondary users showed that the presented method could not only guarantee each user’s QoS but also increase the channel capacity. References | Related Articles | Metrics

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Radial Pulse Wave Reconstruction Based on the Transfer Function and Finger Pulse Wave XU Lisheng， DU Shangjie， HE Dianning， YANG Lin 2014, 35 (11):  1539-1543.  DOI: 10.12068/j.issn.1005-3026.2014.11.005 Abstract ( 668 )   HTML   PDF (645KB) ( 642 )   The acquisition method of radial pulse wave is easily influenced by human body’s activities. The transfer function method was applied to estimate radial pulse wave using finger pulse wave. After the window size and the order of the model were being analyzed， the transfer function FIR model between radial pulse wave and finger pulse wave was set up firstly. Then the test data were used to estimate the radial artery pulse wave and verify the accuracy of the proposed model. By analyzing ten subjects’ data acquired in ten days， the best waveform match between the estimated and the measured radial artery pulse waves were in the range from 70% to 92%. It is notable that using the transfer function method could estimate radial pulse wave from finger pulse wave. This method provided a new easy way for monitoring radial pulse wave. References | Related Articles | Metrics

Materials & Metallurgy

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Influence of Organic Dispersant on Morphology of Spherical Alumina Precursors XU Xiaojuan， SUN Xudong， LI Xiaodong， LIU Shaohong 2014, 35 (11):  1544-1547.  DOI: 10.12068/j.issn.1005-3026.2014.11.006 Abstract ( 898 )   HTML   PDF (607KB) ( 978 )   Monodispersed spherical alumina precursors were prepared by homogeneous precipitation method at very low concentration. Increasing concentration leaded to aggregation and nonspherical powders. Polyvinylpyrrolidone (PVP) and polyvinyl alcohol(PVA)were added as organic dispersants to improve the morphology. The results showed that 1% PVP can improve the state of aggregation， but with the increasing of PVP amount， the dispersing effect will be worse. PVA can improve the morphology and size distribution of the presursors. The best effect is obtained when 1% PVP and 1% PVA are used together， and the precursors are amorphous and spherical with diameter of 850nm. References | Related Articles | Metrics

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Effect of Hydrochloric Acid on the Surface Integrity of HotRolled Stainless Steel Sheets During Pickling Process LI Xiaoliang， SHI Peiyang， YUE Yingying， JIANG Maofa 2014, 35 (11):  1548-1550.  DOI: 10.12068/j.issn.1005-3026.2014.11.007 Abstract ( 648 )   HTML   PDF (3327KB) ( 843 )   Electrochemical method， laser scanning confocal microscopy (LSCM) and scanning electron microscope(SEM) were employed to investigate the effect of the hydrochloric acid on the surface integrity of hotrolled ferritic stainless steel during pickling process. The results showed that with the increase of concentration of hydrochloric acid， the surface becomes smoother. However， high concentration results in severe intergranular corrosion. With the increase of hydrochloric acid content， the shapes of polarization curves in weak polarization area do not change obviously， but the pitting potential and the radiuses of capacitive loop increase， indicating that the corrosion resistance enhances. References | Related Articles | Metrics

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Precipitation Behavior of Inclusions in 253MA Steel with Different Cleanliness LI Yandong， LIU Chengjun， JIANG Maofa 2014, 35 (11):  1552-1555.  DOI: 10.12068/j.issn.1005-3026.2014.11.008 Abstract ( 560 )   HTML   PDF (1105KB) ( 718 )   A coupled thermodynamic model of inclusion precipitation and solute elements microsegregation during solidification of 253MA steel was established on the base of the reaction equilibrium principle of multiphase and polycomponent， and the redistribution theory of solute elements in the interface of liquid and solid during solidification. The accuracy of this model was validated through the commercial test and scanning electron microscope (SEM) analysis of inclusions formed in the samples. Under the rated condition， the inclusions in 253MA steel are mainly Ce2O3， Ce2O2S， Ce3S4， CeS， CeN， SiO2 and MnS. And the precipitation principles of these inclusions are obtained by this model. When oxygen content in 253MA steel is higher 0006%， Ce2O3 can precipitate if the ratio ［%O］ / ［%S］ is greater than 1. When oxygen content is lower than 0. 006%， Ce2O3 can precipitate if the ratio is greater than 2. When the oxygen content is lower than 00046%， Ce3S4 precipitates and CeN disappears if ［%O］+［%S］>0009; CeS exists in steel when ［%O］/［%S］<1 and transfers to Ce3S4 with the increase of the sulfur content. When the oxygen content is higher than 00046%， CeN can precipitate if 2［%O］+［%S］<0014. References | Related Articles | Metrics

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Corrosion Inhibition Control of Ferritic Stainless Steel in Hydrochloric Acid Electrolytes YUE Yingying， LIU Chengjun， SHI Peiyang， JIANG Maofa 2014, 35 (11):  1556-1559.  DOI: 10.12068/j.issn.1005-3026.2014.11.009 Abstract ( 611 )   HTML   PDF (725KB) ( 832 )   Electrochemical method， weight loss and scanning electron microscope (SEM) were employed to investigate the corrosion behavior of ferritic stainless steel in hydrochloric acid electrolytes. SDS(sulfosalicylic acid dihydrate) and SAD (sodium doclecyl sulfate) were tested as corrosion inhibitors for ferritic stainless steel in 5% HCl at 40℃. The results showed that the ferritic stainless steel keeps active dissolving in hydrochloric acid electrolytes and suffers from uniform corrosion accompanied with intergranular corrosion along the grain boundaries. Both SDS and SAD are interface inhibitors and their inhibition efficiency have a threshold. When the concentration of inhibitor is 0. 015%， both the two inhibitors decrease dramatically the corrosion rate of stainless steel. The inhibiting efficiency of SAD is higher than that of SDS under the same concentrations. References | Related Articles | Metrics

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Numerical Simulation of Magnetohydrodynamic Behavior of ESR Slag WANG Xiaohua， LI Ying 2014, 35 (11):  1561-1564.  DOI: 10.12068/j.issn.1005-3026.2014.11.010 Abstract ( 584 )   HTML   PDF (1117KB) ( 621 )   A coupled model for the magnetic field， temperature field and fluid flow field of electroslag remelting (ESR) was developed. Considering electromagnetic force and thermal buoyancy force effects on the fluid flow in slag pool， the effects of practice parameters (electrode tip shape， immersion depth， and current density) on the magnetohydrodynamic behavior of ESR slag were investigated. The results showed that the anticlockwise circulation pattern is generated in slag pool when electromagnetic force is dominated， and the clockwise circulation pattern is generated in slag pool when buoyancy force is dominated. When current density and current frequency are 5000A and 50Hz， respectively， the anticlockwise vortex and clockwise vortex are coexisted in slag pool for the electrode tip with flat shape， but only clockwise vortex is existed in slag pool for the electrode tip with conical shape. The maximum velocities of molten slag are 005m/s and 020m/s for the electrode tip with flat shape and conical shape， respectively. Increasing immersion depth and current density can enhance anticlockwise vortex in slag pool. On the contrary， the clockwise vortex in slag pool is enhanced. References | Related Articles | Metrics

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Thermodynamic Analysis of BF Slag Waste Heat Recovery System Using EnthalpyExergy Diagram DUAN Wenjun， YU Qingbo， QIN Qin， HOU Limin 2014, 35 (11):  1565-1568.  DOI: 10.12068/j.issn.1005-3026.2014.11.011 Abstract ( 877 )   HTML   PDF (712KB) ( 886 )   The heat recovery efficiency of different BF slag waste heat recovery systems were analyzed by using enthalpyexergy diagram. Enthalpy and exergy efficiency were calculated and compared by physical recovery method to produce hot water or steam and chemical recovery method by endothermic reactions of decomposition of limestone， coal gasification， methane reforming. The results showed that the heat efficiency of applying the waste heat of BF slag to produce hot water is 769%， equal to that of producing steam. While the enthalpy efficiency of the two is different， the former is 144%， and the later is 342%. The heat efficiency of chemical reaction with BF slag is as high as 922%， while the enthalpy efficiency is 627%. Both are higher than those of physical heat recovery method. Applying the coal gasification to recover the waste heat of BF slag can absorb 165 kg per tone of slag， which attribute to realize the goal of energy conservation and slow down the greenhouse effect. References | Related Articles | Metrics

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Numerical Simulation on Fluid Flow Characteristics of the Settler in High Efficient Clarification and Extraction Tank with Double Stirring LYU Chao， ZHANG Zimu， ZHAO Qiuyue， ZHANG Tingan 2014, 35 (11):  1570-1573.  DOI: 10.12068/j.issn.1005-3026.2014.11.012 Abstract ( 494 )   HTML   PDF (1382KB) ( 622 )   On the base of commercial CFD software FLUENT 120， the fluid flow characteristics of the settler in high efficient clarification and extraction tank with double stirring were simulated numerically by using Eulerian multiphase flow model and MorsiAlexander model. The results showed that the settler with stirring can effectively reduce dispersion band thickness，which make the stable time of dispersion band thickness shorter than that without stirring， and can reduce the oil content in water phase at outlet， and it shows that the appropriate stirring can accelerate the separation process for clarification. Numerical simulation result of water phase velocity vector is the same with the velocity vector measured by PIV， which further confirms that the stirring can inhibit backflow and enhance twophase separation. References | Related Articles | Metrics

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Effect of Acid Leaching on the Vanadium Leaching Rate in Process of Vanadium Extraction Using Calcium Roasting ZHANG Juhua， ZHANG Wei， ZHANG Li， GU Songqing 2014, 35 (11):  1574-1577.  DOI: 10.12068/j.issn.1005-3026.2014.11.013 Abstract ( 709 )   HTML   PDF (563KB) ( 923 )   Sulfuric acid leaching was used to recover vanadium from calcium roasting vanadium slag. The effects of particle size， pH， leaching temperature， time， ratio of liquid to solid (L/S)， stirring speed on the leaching rate of vanadium and impurities were investigated. The results showed that the vanadium leaching rate increases slowly when the particle size is smaller than 75 μm， and it is improved by less than 3% with increasing L/S from 2∶1 to 7∶1 and the stirring speed from 100 to 500r/min. The pH value has great effect on vanadium recovery. The leaching rate of vanadium reaches over 90%， and the leaching rate of impurities， like Ca， Mn， Mg， Al， Si， P， are 10%~30% in pH range from 2 to 3. Under the optimal conditions of particle size of 9675 μm， pH of 25， temperature of 55 °C， time of 30 min， L/S of 3 and stirring speed of 500 r/min， the vanadium leaching rate is over 91%. References | Related Articles | Metrics

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Bacterial Oxidation and Cyanide Leaching Process for Carbonaceous CarlinType Gold Deposit LUO Wenjie， YANG Hongying， QIU Xuemin， LI Haijun 2014, 35 (11):  1579-1582.  DOI: 10.12068/j.issn.1005-3026.2014.11.014 Abstract ( 587 )   HTML   PDF (368KB) ( 587 )   Bacterial oxidation by mixed acidophilic bacteria and cyanide leaching experiments for a carbonaceous Carlintype gold deposit in Yunnan province were carried out. The results showed that the gold recovery of direct cyanide leaching is very low (129%). The sulfide minerals packing problem can be effectively solved by bacterial oxidation process， which greatly increases the gold recovery. But the prerobbing effect can’t be eliminated by this process. The absorption effect of carbonaceous substances can be effectively inhibited by carbon cyanide leaching， which can further improve gold recovery for bacterial oxidation residue. Through bacterial oxidation and carbon cyanide leaching process， the gold recovery can reach 8239% and the cyanide reagent is reduced by 4968%. So the bacteria oxidation and carbon cyanide leaching process is an effective method for carbonaceous Carlintype gold deposits. . References | Related Articles | Metrics

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Research on the LowVelocity Impact Performance of Aluminum Foam Sandwich Panels ZU Guoyin， LIU Jia， LI Xiaobing， SUN Shiliang 2014, 35 (11):  1583-1587.  DOI: 10.12068/j.issn.1005-3026.2014.11.015 Abstract ( 609 )   HTML   PDF (1342KB) ( 718 )   The lowvelocity impact tests on the aluminum foam sandwiches(AFS) with a metallic bonding and adhesive bonding between face sheets and foam core were carried out. The mechanical response and failure mode of two kinds of AFS was studied. The results showed that the two kinds of AFS have the ability of energy absorption， but the buffer time of AFS with a metallic bonding between face sheets and foam core is longer than that of the adhesive structure. With the increase of load， the yield load and platform load of the AFS with a metallic bonding between face sheets and foam core increase and the buffer time reduces， showing an obvious strain rate effect during the test. The failure modes of the AFS with a metallic bonding between face sheets and foam core are core shear， core compaction and panel bending deformation. References | Related Articles | Metrics

Resources & Civil Engineering

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Incremental Harmonic Balance Method for Response Analysis of the Complex Mining Equipment with Periodic Excitation ZHAO Qian， ZHANG Wenbing， YAO Hongliang， WEN Bangchun 2014, 35 (11):  1588-1591.  DOI: 10.12068/j.issn.1005-3026.2014.11.016 Abstract ( 700 )   HTML   PDF (716KB) ( 495 )   Aiming at the serious vibration of complex mining equipment which caused by periodic excitation， the feeding device of largescale mining equipment was studied and its steel structure was simplified as a frame structure model. Considering material impact was the main source of vibration， the incremental harmonic balance method with nonharmonic periodic excitation was proposed. Vibration characteristics were analyzed by using the proposed method， and its accuracy and efficency were verified by Newmarkβ method. The nonlinear dynamic response which caused by the ground or the base contact and the response regular with different ground hardness were investigated. The results showed that this method is effective for analyzing the nonlinear steadystate response problems of complex mining equipment with periodic excitation. References | Related Articles | Metrics

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Reliability Robust Optimization Design for Complex Rotor System Under Resonance Failure ZHU Lisha， ZHANG Yimin， WANG Changyi 2014, 35 (11):  1592-1596.  DOI: 10.12068/j.issn.1005-3026.2014.11.017 Abstract ( 556 )   HTML   PDF (403KB) ( 562 )   According to the determinate criterion for the failure of a large complex rotor system， a reliability model based on the resonance failure was proposed and the reliability robust optimization design parameters for the rotor system could be accurately obtained. Firstly， based on the rotor dynamic theory the weakest link was identified， and the real isolative margin and allowable isolative margin were assessed. The resonance reliability model for rotor system judged by the criterion that the real isolative margin could be more than the allowable one. Then using the neural network technology， reliability design theory and modified reliability sensitivity design theory， the influence degree of original random parameters on reliability was computed out and found out which parameter has a high influence degree. Finally， reliability robust optimization design theory for system was studied to reduce sensitivity of random parameters to reliability on the basis of ensuring a certain reliability. References | Related Articles | Metrics

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Finite Element Analysis on Friction and Wear Properties of Nonsmooth Surface Brake Disc SUN Shaoni， XIE Liyang， ZHANG Yichen 2014, 35 (11):  1597-1600.  DOI: 10.12068/j.issn.1005-3026.2014.11.001 Abstract ( 647 )   HTML   PDF (845KB) ( 567 )   Based on friction test required dimension and nonsmooth surface design size， the brake disc/pad models of nonsmooth surface were established. The interaction between contact pressure and friction heat during the braking process was analyzed to establish the thermalstress coupling analysis model， and analyzed the friction and wear properties of nonsmooth surface brake disc/pad system by Ansys/LSDYNA. The results showed when the pits spacing is 1mm and the diameter is 08mm， nonsmooth surface brake/pad system has smallest von Mises stress. Through the friction and wear test， the wear loss and kinetic coefficient of actual samples were tested and the result showed the same characteristics with the simulation results， so the credibility of simulation result was verified. References | Related Articles | Metrics

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Stability Analysis of Surrounding Rock Under Different TBM Supporting Forms HUO Junzhou， YANG Jing， SUN Wei， LING Jingxiu 2014, 35 (11):  1602-1606.  DOI: 10.12068/j.issn.1005-3026.2014.11.019 Abstract ( 1037 )   HTML   PDF (1388KB) ( 790 )   The simulation models of two typical supporting structures has been established， according to the structure characteristic of X supporting and horizontal supporting， which analyzed the simulation models of different contact areas with class II and class V rock. The results show that class II rock remains stable only in 100% contact area while class V rock is difficult to maintain stable when using horizontal supporting structure. Class II and class V rock both can remain stable under X supporting structure. The above analysis conclusions will provide a theoretical basis for TBM supporting structure selection in the future. References | Related Articles | Metrics

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A Method for Estimating the Degree of Association Between Auditory Filter Signals Based on Synchronism Cue LI Yungong， YU Lianghui， YE Lili， DAI Li 2014, 35 (11):  1607-1611.  DOI: 10.12068/j.issn.1005-3026.2014.11.020 Abstract ( 455 )   HTML   PDF (749KB) ( 523 )   Inspired by the signal processing model of the human auditory system， a method of the degree of association between signal components was proposed. Firstly， the signal was successively processed with Gammatone bandpass filter， inversed order filter and halfwave rectification. Then， the once， twice and thrice extremums were picked out in the waveform after halfwave rectification to generate three kinds of units sequences. By using these units sequences， two synchronisms between adjacent filter channels signals and the once and twice extremums points in different filter channels were calculated respectively. The former synchronism may present the correlation， and the other reflects the degree of fluctuation association. A vibration signal measured from a gear system with tooth backlash is analyzed by the method. The results show the proposed method can discover those signal components with high degree of association， and it is favorable for reducing data size and revealing the dynamic characteristics of the measured system. References | Related Articles | Metrics

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Cutting Robot PostProcessing Method Based on STEPNC LI Li， FANG Lijin， WANG Guoxun 2014, 35 (11):  1612-1616.  DOI: 10.12068/j.issn.1005-3026.2014.11.021 Abstract ( 533 )   HTML   PDF (1184KB) ( 581 )   In order to solve the low degree of openness， intelligence and integration existing problems in the machining robot control system， the STEPNC standard was introduced into robot machining field and the machining robot post processing system was constructed based on STEPNC. The efficient information extraction librarySTNCLib which proposed the tool path planning method based on isophoto line was developed based on STDeveloper software. The robot motion control program was generated finally， and it could achieve information integration. The correctness and effectiveness of the proposed method was verified by using the software programming and simulation method， the result shown the reasonability and feasibility. References | Related Articles | Metrics

Mechanical Engineering

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Optimization of Iron Removal Process for Calcine of Fly Ash and Ammonium Sulfate via Response Surface Methodology WANG Peng， WEI Dezhou 2014, 35 (11):  1617-1621.  DOI: 10.12068/j.issn.1005-3026.2014.11.022 Abstract ( 561 )   HTML   PDF (318KB) ( 521 )   The optimization of process parameters of iron removal for leachable liquid which is from calcined production of the fly ash and ammonia sulfate was described. The corresponding mathematical model on iron removal by ammonium jarosite method and goethite method were established，respectively. In the above process， the reaction temperature， pH value and adding amount of seed precipitation were variable， and the concentration of aluminum ions and iron ions were corresponding variables. The affecting factors were analyzed at the same time. The models are checked by experiment， and the error is less than 5%， which indicates the models are reliable. After the solution of the models， the best process condition of iron removal is given via ammonium jarosite method and goethite method respectively. References | Related Articles | Metrics

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Effect of Different Factors on Dust Flow Regularities in Fully Mechanized Caving Face YAO Xiwen， LU Guangli， XU Kaili， YAN Fang 2014, 35 (11):  1622-1626.  DOI: 10.12068/j.issn.1005-3026.2014.11.023 Abstract ( 612 )   HTML   PDF (1116KB) ( 510 )   Based on the theory of coupling discrete phase model， air flow regularities and dust distribution were investigated by using CFD， contrastive research on dust concentration was carried out under different factors， such as different coal seam dip angle， different ventilation quantity and different dust diameter， and comparative analysis between simulating dust concentration and field measurement results was conducted. The results showed that air trends to flow near coal wall in high inclinationangle fully mechanized caving face. The respirable dust is active with adding coal seam dip angle. After appropriate increase air volume， respiratory dust is easy to be carried by air， and the dust concentration reduces obviously， but too large air speed may produce secondary dust. References | Related Articles | Metrics

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Research of Making Skarn Gold Mine Tailings into Art Pottery Body Material HUANG Fei， LIU Rui， YU Haoran， WANG Feng 2014, 35 (11):  1626-1629.  DOI: 10.12068/j.issn.1005-3026.2014.11.024 Abstract ( 717 )   HTML   PDF (677KB) ( 537 )   By modern technology，phase composition， chemical constitution and grain composition of a skarn gold mine tailing from Hubei Province were systematically tested. Remedying the defect of tailings used pottery clay according to its composition. Mixing water and raw material for green bodies and then firing the green bodies into the pottery bodies was designed under oxidizing atmosphere through 15hours with the firing temperature of 980~1000℃. The results showed that some new kinds of mineral facies， such as calcium feldspar， appear in pottery bodies and the pottery bodies meet the performance requirements of art pottery bodies because of their closegrained internal structure， 746% water absorption and 55~6Mohs hardness. It can be proved that skarn gold mine tailings are feasible for art pottery body materials making. References | Related Articles | Metrics

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Experimental Studies on TwoSide Constraint Steel Plate Shear Wall with Vertical Stiffeners MU Zaigen， ZHANG Fujian， SHANG Qingyuan， LI Liming 2014, 35 (11):  1631-1635.  DOI: 10.12068/j.issn.1005-3026.2014.11.025 Abstract ( 574 )   HTML   PDF (911KB) ( 512 )   Two 1∶3 twoside constraint steel plate shear wall specimens with vertical stiffeners were tested under low cyclic loading to study its seismic performance through the performance indexes of the initial stiffness， hysteretic behavior， loadcarrying capacity， destruction mechanism and so on. Tests results showed that as main lateral force resisting members twoside constraint steel plate shear wall with vertical stiffeners had a very superior seismic performance. In the elastic phase destroyed expected buckling， mainly for the corner plate tearing and buckling failure，the diagonal direction formed apparent tension band can be observed in the steel plate wall destroyed later. So it is worth popularizing in the area of high seismic intensity. References | Related Articles | Metrics

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Distribution and Coupling Mechanism of Temperature and Relative Humidity in Underground Mine Refuge Chamber ZHAN Zina， JIN Longzhe， WANG Yi， WANG Sheng 2014, 35 (11):  1636-1640.  DOI: 10.12068/j.issn.1005-3026.2014.11.026 Abstract ( 609 )   HTML   PDF (1002KB) ( 618 )   To improve living comfort quality in refuge chamber， based on manned test in small confined space， coupling effect of temperature and relative humidity (RH) on body thermal comfort was quantitatively analyzed， which verifies the necessity to configure the apparatus in refuge chamber. The main disturbance sources affecting on temperature and RH were analyzed， and the key parameters were calculated. Using CFD technology， threedimensional model of refuge chamber with oxygen bottle supply was constructed. Without air conditioning， the internal temperature and RH are up to 33℃， 90% within 9h， where the human being has felt muggy. In this respect， cooling and dehumidifying apparatus can effectively control temperature and RH at 30℃， 83% or less. Finally， the feasibility of the simulation process is verified， and it is deemed that RH can be controlled at 80% or less when the temperature reaches to 28℃. This provides basis guidance for the design of underground mine refuge chamber in future. References | Related Articles | Metrics

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Experiment Study of Mining Technology Improvement Based on RBF Neural Network YANG Wei， YANG Shan， ZHANG Qinli， REN Shaofeng 2014, 35 (11):  1641-1645.  DOI: 10.12068/j.issn.1005-3026.2014.11.027 Abstract ( 633 )   HTML   PDF (423KB) ( 575 )   The underground stoping at a metal mine was in low production efficiency， large explosives consumption and high boulder yield. To solve these problems， an orthogonal test of L9(33) on blasting parameters was proposed， based on which， the RBF neural network model， using the blasting burden spacing， borehole spacing and surroundingborehole spacing as input layer， and taking explosives consumption and boulder yield as the output layer， was established. The comprehensive expectation formula of blasting based on safety and economy is given， and it is determined that the best blasting burden spacing， borehole spacing and surroundingborehole spacing are 1 m， 1. 4m and 1m， respectively. After the mining process improvements， the stope production capacity is 4 times as before， more stopes can be filled， exposure time of stope is shorter， single stope production efficiency is increased by 75%， explosives consumption is reduced by 62%， large fragment rate is reduced by 74%. References | Related Articles | Metrics

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Analysis on Stability of Unsaturated Soil Slope Considering Two Dimensional Rainfall Infiltration FU Jianxin， TAN Yuye， SONG Weidong 2014, 35 (11):  1646-1649.  DOI: 10.12068/j.issn.1005-3026.2014.11.028 Abstract ( 592 )   HTML   PDF (517KB) ( 511 )   Based on the basic equations of moisture migration in unsaturated soil， the twodimensional infiltration model of unsaturated soil that uses volumetric water content as control variable was proposed， and is programmed. The program could take the horizontal and vertical infiltration and infiltration capacity in the process rainfall into account. The numerical model for stability analysis of unsaturated soil slope that considering the changes of volumetric water content was constructed， in which the instantaneous moisture was timely imported in order to achieve realtime analysis of slope stability， and to search for the most dangerous slip surface. The engineering applications show that slope stability are closely related with volumetric water content， influence of initial moisture content is the greatest and the rainfall intensity is smaller. With the increase in the time of rain， the moisture content decreases from shallow to deep gradually while the most dangerous slip surface move gradually to shallow. References | Related Articles | Metrics

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Service Area and Route Selection Choice Model for Flexible Feeder Transit with Special Demands PAN Shuliang， YU Jie， ZOU Nan， SHU Bo 2014, 35 (11):  1650-1654.  DOI: 10.12068/j.issn.1005-3026.2014.11.029 Abstract ( 582 )   HTML   PDF (459KB) ( 559 )   Given the fleet size and passenger demand， a networkbased mixed integer linear programming (MILP) model was developed to simultaneously optimize the service area and route planning for the irregularshaped residential communities and the irregular road networks that were typical of many Chinese cities. The proposed model features a twolevel structure with the upperlevel to maximize the number of served passengers by the feeder transit system and the lowerlevel to minimize the operational cost for transit operators. Moreover， a heuristic approach was developed to yield acceptable solutions of the model within a reasonable amount of time. The case studies have validated the effectiveness of the proposed model as well as the algorithm， whose results reveal that the range between the nearoptimal solution by the heuristic algorithm and the optimal solution is around 15% and the difference of the operational cost for each passenger is less than 10%. References | Related Articles | Metrics

Management Science

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Service Quality Evaluation Method Based on Customers′ Linguistic Assessment Information ZHANG Chongyang， FAN Zhiping， YU Chao， LI Mingyang 2014, 35 (11):  1655-1658.  DOI: 10.12068/j.issn.1005-3026.2014.11.030 Abstract ( 496 )   HTML   PDF (316KB) ( 519 )   An evaluation method for service quality based on customers’ linguistic assessment information was proposed to solve the problem of service quality evaluation for multiple service programs or projects of the same type. Firstly， customers’ linguistic assessment information of service programs was obtained by questionnaires and transformed into trapezoidal fuzzy numbers. Then， the average weight of each index， the average perceived performance of service programs with regard to each index and the average service expectation of all the customers for each index were calculated. Furthermore， the service quality evaluation value of each program was calculated by using fuzzy weighted averaging operators， and the similar degree between the service quality evaluation value and the trapezoidal fuzzy number corresponding to each linguistic term was calculated whereby the service quality level for each service program can be determined. For programs at the same level of service quality， their advantages and disadvantages were compared by calculating nonfuzzy values. Finally， a numerical example was given to illustrate the validity and practicality of the proposed method. References | Related Articles | Metrics

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ThreeLevel ProductionInventory Control Strategies with Carbon Constraint Based on the Improved EOQ LAN Haiyan， JI Shoufeng， TANG Jinhuan， ZHU Baolin 2014, 35 (11):  1659-1663.  DOI: 10.12068/j.issn.1005-3026.2014.11.031 Abstract ( 637 )   HTML   PDF (380KB) ( 513 )   For the threelevel productioninventory control with carbon constraint， the production capacity and ordering in the threelevel system with multisuppliers， single manufacturers and multiretailers was explored by using the improved EOQ. The decentralized and centralized decisionmaking model of the threelevel productioninventory system with carbon constraint， and the model of profit compensation contract with manufacturers were established. The decisionmaking model was solved by using heuristic algorithm. The computational experiments and analyses show that the system indexes are better when manufacturers centralize their decisionmaking， the impact of carbon price change on the system is more significant， and the carbon trading mechanism is more effective for carbon emission reduction， thus verifying the validity of the model. References | Related Articles | Metrics

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Design of Substitute Product Distribution Network Under the Risk of Supply Failure GAO Cong， GUAN Zhimin， WANG Ying 2014, 35 (11):  1664-1668.  DOI: 10.12068/j.issn.1005-3026.2014.11.032 Abstract ( 528 )   HTML   PDF (354KB) ( 490 )   The distribution network design of substitute products under the risk of supply failure was studied， and a mixed integer programming model including manufacturers’ production design， capacity allocation， distribution center location and emergency inventory decision was established. In the model， emergencies causing supply chain failure are represented by scenarios， and within the same scenario， more than one node of the distribution network may break down， which may result in a sharp increase of problematic scenarios. The sample average approximation method (SAA) is used for solution， whose validity is verified by experimentally comparing the gaps between the upper bound and the lower bond. Finally， the reliability of supply chain execution， and the relationship between product substitution degree and supply chain profit are analyzed. References | Related Articles | Metrics

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Prediction Models of Website Users’ Behavioral Intentions Based on Multimode Measurement CAO Yaqin， GUO Fu， QU Qingxing 2014, 35 (11):  1669-1672.  DOI: 10.12068/j.issn.1005-3026.2014.11.033 Abstract ( 595 )   HTML   PDF (443KB) ( 531 )   The prediction models of ecommerce website users’ behavioral intentions were established. The three aspects of users’emotional experiences (subjective emotional experience， eye movement characteristics and physiological responses) while browsing an ecommerce website the first time were measured， and their behavioral intentions (approach tendency) for the site thereafter were analyzed. Oneway analysis of variance was used to extract the indicators of emotional experiences affecting users’ behavioral intentions and the relationship models of emotional experiences and behavioral intentions were established based on the support vector machine (SVM). The results show that an integrated use of such indicators as subjective emotional evaluation， eye movement and physiological response can better predict users’ website approach tendency. References | Related Articles | Metrics