Journal of Wuhan University of Technology

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Synthesis and Electrochemical Property of Wormhole Like Mesoporous SnO₂

JIA Tie-kun, WANG Xiao-feng, WANG Wei-min, LIAO Gui-hua, LIU Hong-fei, LIU-Jin 

. 2011, (7): 1-4.

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Wormhole like mesoporous SnO₂ was synthesized via a hydrothermal route assisting by the soft template of CTAB. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectrum and nitrogen absorptiondesorption. The results showed that the products exhibited mesoporous structure with an average pore diameter of 5.8 nm. Electrochemical performance was carried out on the Li ion battery using mesoporous SnO₂as anode material. The first discharge and charge capacities were 1 011.8 mAh/g and 529.18 mAh/g respectively, and the discharge capacity was 326.73 mAh/g after 20 cycles.

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Preparation of Co/SiC Composite Particles Using Electroless Plating Method

ZHOU Chaolan，ZHANG Gaoke，GAN Huihui

. 2011, (7): 5-9.

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Electroless plating method was employed to prepare Co/SiC composite particles. In the process of electroless deposition, the optimal conditions of electroless cobalt can be obtained through studying on the influence factors of the deposition rate, such as cobaltic salt concentration, deoxidizer concentration, complexing agent concentration, buffering agent concentration, temperature and pH value, etc. The composite particles were characterized by Xray diffraction (XRD), Scanning electron microscope (SEM) and Energy dispersive xray analysis (EDAX). The experimental results indicate that the deposition rate is faster and the powder surface is coated by cobalt evenly when the concentration of sulfuric acid cobalt is varied form 30 g/L to 50 g/L, the concentration of sodium hypophosphite is set as 40 g/L, the concentration of sodium citrate is between 60 g/L and 70 g/L, the temperature is controlled in 50 ~ 70 ℃ and pH value is adjusted as 8.

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Effect of Twostage Homogenization on the Microstructure and Mechanical Properties of a 7055 Aluminum Alloy

ZHANG Rong，LIN Gaoyong，WU Liqun

. 2011, (7): 10-13.

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The effect of homogenization on the microstructure and properties of a 7055 alloy was investigated by optical microscopy, transmission electron microscopy, Vickers hardness test and uniaxial tensile test. It is found that the initial lowtemperature preheating for the twostage homogenization, comparing with the singlestage homogenization, can achieve a higher density of Al3Zr particles, and a narrower precipitating free zone (PFZ). It is suggested from microstructural analysis that the dispersion distribution of fine Al3Zr particles decreased the recrystallized fraction by 40% due to the efficient dragging effect of Al3Zr particles on the grain boundaries and dislocations. Meanwhile, the unrecrystallized microstructure containing profuse dislocations enhanced the mechanical properties of the studied alloy at the T6 state.

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Study on Preparation and Stability of Silica Sol System by Acidbase Twostep Catalytic Process

WU Qijian, WU Qingren, YANG Yuan, CAO Qi, REN Yuping, SHUI Chunsheng, LUO Yingzhe

. 2011, (7): 14-19.

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Silica sol was fabricated by using tetraethyl orthosilicate, deionized water and ethanol as raw materials，and hydrochloride and dilute ammonia solution as catalyst for twostep acidbase catalytic process. The stability of the silica sol system was characterized by viscosity and gel time. The effect of deionized water, ethanol, pH，acidbase catalytic interval time and reaction temperature of silica sol system on the silica sol stability was investigated. The researched results show that the stability of silica sol is decreased firstly and then increased with the increasing of both deionized water and pH，but is decreased rapidly with the rising of reaction temperature and prolonging of acidbase catalytic interval time, and that increasing the amount of ethanol is beneficial to the stability of silica sol system.

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Preparation of Novel V₂O₅-WO₃/TiO₂/Honeycomb Cordierite Catalyst and Their Application in Selective Catalytic Reduction of NO

LIU Renlong，LV Hanqing, LI Guoyun, WU Xuhong, XIE Yinyin, DU Jun

. 2011, (7): 20-23.

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A composite support TiO₂/honeycomb cordierite modified by V₂O₅-WO₃has been prepared via static impregnation method and used for the preparation of V₂O₅-WO₃ basedmonolith SCR catalyst. The X-ray diffraction method and BET technology were applied for catalyst characterization, and the activity for NO catalytic removal by NH₃ has been evaluated. The influences of impregnation process on SCR activities indicated that the existence of oxalic acid in precursor solution decreased the SCR activity of the obtained catalyst by affecting the aggregation morphology of V₂O₅ on catalyst surface. The effects of temperature, initial NO concentration, space velocity and NH₃/NO ratio on the SCR reaction have been investigated. The prepared catalyst showed a good activity, the NO conversion can reach 99% under the condition of 375 ℃, NH₃/NO=1 and the space velocity of 10 000 h^-1.

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Road Performance of MiberⅠMineral Composite Fiber Reinforced Asphalt Mixture

XIONG Rui, CHEN Shuanfa，GUAN Bowen，CONG Peiliang，MA Lili

. 2011, (7): 24-27.

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No research has been done on the performance of MiberⅠmineral composite fiber reinforced asphalt mixture at home and abroad. In view of that, by analyzing the technical characteristic of MiberⅠmineral composite fiber, the feasibility of the fiber’s application in asphalt mixture is evaluated. Through the rutting test, low temperature bending test and freezethaw splitting test, the performance of MiberⅠmineral composite fiber asphalt mixture are investigated, along with the comparsion of the improvement effects of lignin fiber and basalt fiber on the asphalt mixture. The results show that adding appropriate dosage of MiberⅠmineral composite fiber can improve the road performance of asphalt mixture effectively. Compared with lignin fiber and basalt fiber, MiberⅠmineral composite fiber demonstrates certain advantages in the improvement effect on the road performance of asphalt mixture. The research results can provide a basis for the application of MiberⅠmineral composite fiber in the asphalt mixture.

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Study on Effects of Flexible Curing Agent on the Structure and Performance of Epoxyasphalt

ZHOU Wei， ZHAO Hui，WEN Jun，CAI Fangchang，MA Ning， JIANG Tao

. 2011, (7): 28-31.

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A serious of epoxyasphalts were prepared by active compatibilizer, flexible curing agent, pure asphalt and epoxy. The effects of curing agent on the compatibilities of epoxyasphalt, torn section, mechanical properties and weather resistance performance were discussed in details. There were found, with the helping of curing agent, asphalt dispersed in epoxy resin at the size of about 1 μm, the torn section of epoxyasphalt curing system was layered or skinlike fracture. Increasing curing agent, the bond strength, tensile strength and elongation at break had a trend of decline after rising. After a freezethaw cycle, the mechanical strength decreased. When curing agent was 15～17 phr, the bond strength was 47.8 MPa, tensile strength was up to 1.94 MPa, and elongation at break was 464%.

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Study of Self Compacting Concrete with Rice Husk Ash

WAN Huiwen，LIU Li，CHEN Wei

. 2011, (7): 32-34.

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Generating electricity by burning the rice husk is an effective method to contribute to energy saving and emission reduction.The rice husk ash (RHA) which was collected by power plants was added in self compacting concrete (SCC) as a kind of mineral admixture. The concrete mix proportion was designed and adjusted to assure the intensity of the concrete reach the C40 grade and the self compacting properties meet grade Ⅱ. The result shows that when the waterbinder ratio is 0.34, sand ratio is 0.46, with 8.2% RHA and 1.5% superplasticizer, the intensity and self compacting properties of the concrete can both meet the designed level and the volume stability was also satisfying.

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Synthesis and Characterization of Comblike Poly(Vinyl Chloride) with Crystallizable Side Chains

LIU Yaqun, CHENG Peipei

. 2011, (7): 35-37.

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With poly(vinyl chloride) and sodium laurate as raw materials, comblike poly (vinyl chloride) with crystallizable side chains was synthesized by chemical grafting. The structure and crystallizability of the comblike PVC were investigated by FTIR, 1HNMR, GPC and DSC. The results showed that comblike side chains were grafted to PVC backbone successfully and formed crystal. With the increasing of the graft degree, the melting enthalpy was improved. When the reaction temperature was 70 ℃, the reaction time was 9 h, and the content of monomer was 50%, the graft degree and crystallizability were better, reaching 6.72% and 13.4 J/g respectively.

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Study on Synthesis of εCaprolactone over Solid Acid Catalysts Ⅲ—Simulation of Distillation

ZHANG Guangxu，OU Huaqiang，HU Changlin，HU Zhangyan

. 2011, (7): 38-41.

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Using the platform of Aspen Plus engineering software, the distillation process for the εcaprolactone product mixture from twostep catalytic reaction of cyclohexanone and hydrogen peroxide with B2O3/γ-Al2O3 catalyst was simulated. Based on the consideration of the prodct properties, used the UNIQNTH method and the RadFrac module to carry out the calculation of the series connection distillation process and the parallel connection distillation process respectively. The results showed that the parallel connection distillation process was superior to the series connection distillation process, the process was reasonable and it could meet the requirement of products separation. Then every rectifying column in the parallel connection distillation process was simulated in detail and the reliable data which will provide help for the process design and practical operation was gained.

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Parallel Genetic Algorithm Based on Adaptive Migration Strategy

LI Wei, HUANG Ying, LI Kangshun

. 2011, (7): 38-142.

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This paper analyzed the traditional limitations of parallel genetic algorithms, for its migration fixed blindness and other disadvantages. A parallel genetic algorithm based on adaptive migration strategy (AMPGA) was proposed in this paper, which was suitable for running on the current multicore computers. This implementation combines the genetic algorithm and current computer architecture, which makes the parallel genetic algorithm execute on the mainstream computer concurrently and improve the convergence speed, fully tap the computer’s computing capability. The experiments showed that this algorithm had not only faster convergent speed but also has more accurate precision as well as higher parallel efficiency.

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Synthetic Index to Predict Coal Combustion Efficiency in Coalfired Power Plant

XUE Xinghua, WANG Yunquan, XIAO Chensheng, ZHOU Shuiliang

. 2011, (7): 42-46.

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Problems of big variation in coal quality, low combustion efficiency and large coal consumption are faced by most coalfired power plants in China. It is important for these plants to precisely valuate coal quality and to predict its combustion efficiency. According to coal combustion in a real boiler of power plant, two type indexes that were respectively based on proximate analysis and coal petrographic characteristics were used to valuate pulverizedcoal combustion efficiency. Results showed that volatile matter, inherent moisture and calorific value were significant as proximate analysis was considered, and that active maceral (vitrinite, exinite and partial inertinite) content was of significant as coal petrographic characteristics were concerned. Additionally, pulverizedcoal size was unnegligible. Then a synthetic index (SI2) which showed good correlation with unburnt carbon content in fly ash was proposed for the valuation of coal combustion efficiency. 

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Study on the Performance of Warm Mix Asphalt with KSH Additives

WANG Chun，HAO Peiwen，LI Ruixia，YANG Kai

. 2011, (7): 47-50.

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The paper compared differences of water stability, high temperature stability, low temperature cracking resistance performance between warm mix asphalt adding different mechanism of KSH additives and the same grade of hot mix asphalt through the test of asphalt mixture.It is found that residual stability, freezethaw splitting intensity ratio, dynamic stability and low temperature bending breakdown strain can meet or exceed the corresponding indicators of hot mix asphalt, even the 60 ℃ Marshall stability of warm mix asphalt can not reach 8 kN.This indicates that the require of the stability of warm mix asphalt to reach 8 kN is unreasonable when using asphalt not modified. The road performance of warm mix asphalt,adding KSH additives,could meet the standard requirements of hot mix asphalt.

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Research on the Asphalt Dispersion Characteristics andAsphaltaggregate Interaction

XU Jinzhi, HAO Peiwen

. 2011, (7): 51-56.

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Using a simple sieve analysis method, this paper investigated the dispersion characteristics of foamed asphalt and foamed asphaltaggregate interaction in foamed asphalt mix. Several mix design variables were considered, including asphalt foamability, temperature and gradation of mineral aggregates and mixing moisture content, etc. The test results showed that improvement of asphalt foamability and aggregate temperature can more help asphalt dispersion and increase the largest aggregate particle size coated by foamed asphalt in a certain extent. Among the mixtures where foamed asphalt dispersed evenly, asphalt mainly coated fine aggregates passing through 1.18 mm sieve, especially those passing through 0.3 mm sieve. To ensure good properties of foamed asphalt mix, fine aggregates passing through 0.3 mm sieve must be enough and should be of a continuous gradation. Irrational mixing moisture content would lead to asphalt clot, thus adversely affecting the strength and stability of foamed asphalt mix. Appropriate mixing moisture content should be determined by trial and test in the design of foamed asphalt mix.

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Research on Influencing Factors and Prediction Model of Rutting Process for Asphalt Mixture

LI Peilong，LI Honghua，ZHANG Zhengqi， WANG Binggang

. 2011, (7): 57-61.

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Hamburg wheel tracking test was conducted to analyze the influence of load cycles, specimen thickness, test temperature and mechanical properties of asphalt mixture on the rut process of mixture. According to the relationships between these factors and rut depths, a rut prediction model was established. Three kinds of mixtures (AC-13, AC-16 and AC-20) were prepared and rut tests were carried out under the three temperatures of 40 ℃, 50 ℃ and 60 ℃. And the model parameters were determined by fitting the rut and mechanical performance test data. The results indicate that rut depth increases with load cycles by a power relationship, grows exponentially with temperature and shows power relationship with mechanical parameter of mixture for repeated loading test. But it has no significant relationship with specimen thickness. The error of prediction and measured rut depths is almost within ±10% by the established prediction model. The model parameters were amended according to the rut depth data from nine field pavement sections, and rut prediction model was gained, which can afford some references to mixture design.

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Analysis of Vehiclebridge Coupled Vibration with Several Driving Conditions of Bigspan Continuous Beam

JIANG Peiwen,HE Shuanhai, SONG Yifan,ZHOU Yongjun,WANG Lingbo

. 2011, (7): 62-67.

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In order to discuss the respond of coupled vibration of vehiclebridge in complex vehicle driving conditions, this paper present a vehiclebridge coupled vibration numerical analysis method based on ANSYS. The relationship between bridge and vehicle is satisfied by APDL language for their separate models in ANSYS environment and can get its vibration schedule response, which verified by contrast to classic references. The paper analyze the respond of vehiclebridge coupled vibration of a bigspan continuous beam with whole sections in two usual conditions which are the vehicles driving condition and the reverse driving condition and sum up the laws about the deflection and bending moment impact factors’ changing in the vertical extension of the bridge. The results shows that the changing regularity of deflection and bending moment impact is complex in the whole sections, whose value has a strong relationship with driving speed and corresponding section. The impact factors easy to produce mutations in the bridge protection, it changes smooth in the span but appears a tipping point near the middle of midspan. The deflection or bending moment impact factors shows a inversely proportional tendency, which can’t use simple function for regression.

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Effect of Rudder Ball Geometric Parameters on Propeller Hydrodynamic Performance

HE Miao, WANG Chao, GUO Chunyu, HUANG Sheng

. 2011, (7): 68-72.

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The hydrodynamic performance of propellerrudderrudder ball system was calculated in order to study the effect of geometric parameters of rudder ball. Hyperbolical quadrilateral panels are used to avoid gap between panels, and grids at rudder ball are refined. On surface of propeller blades, panels along the span direction and the chord direction were both arranged by the cosine method. An iterative calculation method was used to derive the interaction between the propeller, rudder and rudder ball system. Both induce velocities of propeller to rudder and rudder to propeller were circumferentiallyaveraged, and the unsteady problem was translated to steady state. Comparisons between the calculated results and experimental data indicate that the present method is reliable. The variable scales of rudder ball were investigated, and the calculation results show that there is an optimal matching between propeller diameter and rudder ball diameter, and the rudder ball critical length exist.

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Preassessment Model of Tropical Cyclone Disaster on Navigation Environment of Costal Port

WU Lichuan，WEN Yuanqiao，CHEN Peiyan，JI Yongqing

. 2011, (7): 73-77.

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There are differences between the hazardaffected of tropical cyclone in navigation environment and others. In this paper, tropical cyclone’s wind, rainfall, wave, port potential vulnerability and the level of against typhoon are chosen as evaluation index to build the evaluation model of tropical cyclone disaster on navigation environment of costal port, using AHP and an algorithm to aggregate thelinguistic opinions of a homogeneous/heterogeneous group of experts. Some tropical cyclone which affect Hong Kong port are chosen as examples to do the experimental using this model. The relevant departments can formulate the emergency plan and deployment the emergency rescue accroding to the evaluation results of the model, because the evaluation index can be forecasted.

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Composite Advantage Evaluation of “Golden Waterway”Green Transport Chain

ZHANG Youtang, HUANG Yang

. 2011, (7): 78-82.

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The Yangtze River is a traffic artery which connects the Eastern, Central and Western, and it provides important support for sustained and rapid development of the economy along the river. The development of Yangtze River green transport chain is the urgent need of “the two types of social strategy”. Based on systematic analysis of the Yangtze River shipping’s comprehensive advantage, the article establishes a scientific evaluation index system and use fuzzy comprehensive evaluation method to reveal the Yangtze River shipping’s advantages compared to other transport modes though empirical analysis. All this researches laid a theoretical foundation for reasonable location of the Yangtze River shipping.

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Longtime Prestress Losses Analysis Method for Concrete Structure

LU Zhifang，LIU Muyu

. 2011, (7): 83-87.

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Prestress losses analysis method, account for time variation and uncertainty of shrinkage and creep, and interaction between which and prestress relaxation of tendon, is promoted based on Latin hypercube sampling method and ageadjusting effective modulus method, to form a calculation method for concrete structure longterm prestress losses. The analysis shows that the measures result of C50 prestress girder experimental model are located in the middle of calculated confidence interval for prestress losses, and the prestress losses analysis method of concrete structure is accurate and reliable.

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Effective Length Factor of Highpier Analysis Considering Pile Foundation Flexibility of Multispan Girder Bridge

GAO Xiaoni,HE Shuanhai,QI Hongxue

. 2011, (7): 88-93.

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In order to investigate the effect of effective length factor of piers pile when considering the pile foundation flexibility，calculation formula of piertop’s horizontal flexibility is derived，besides，the piertop’s horizontal elastic support is integrated by antipush rigidity of adjacent span’s substructure and support．The relationship between effective length factor and critical loads is established by means of Euler’s formula of axial compressive bar．According to component stability calculation，the influence parameters and the change law of effective length factor are analyzed．The results show that the effective length factor considering the pile foundation flexibility is greater than not considering，and the growth rate of them is 10% at least；it is complex that calculation is influenced by the pile foundation flexibility，when pier is tall．Finally，it is advised that design of pier which is tall should consider the influence of the pile foundation flexibility in order to get more accurate effective length factor to guarantee safety of framework.

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Effects of Temperature on Modal Frequencies of Large Bridge

ZHANG Tong

. 2011, (7): 94-100.

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In order to analyze the effects and regularity of modal frequencies due to temperature changes, and find out a directive, accurate and operative method to predict and filter this effect in the long term monitoring of bridges, this paper designs two BP neutral network models, in which temperatures of bridge structure and frequencies are taken as input elements and output elements, respectively. The two models are respectively based on single section and multi section temperature distribution, to contrastively analyze their fitting and prediction effects. It is found that the two models all accurately predict and fit the modal frequencies and have better expanding performance. The better predict effect of the neutral network model can be obtained based on the multi section temperature distribution, the relative error is only more than 0.1%. The distribution and changes of temperature have obvious effects on modal frequencies of bridge. BP neutral network models can accurately fit and predict the changes of frequencies along with temperature changes. The influence on modal frequencies by the distinction of temperature longitudinal distribution along the bridge can not be ignored.

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Research on Isolated Effect of Continuous Girder Bridges with LRB Based on Influenced by Selfvibration Characteristic and Spectrum Characteristic

MA Yongquan，Chen Shuisheng

. 2011, (7): 101-106.

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In order to investigate the isolated effect of LRB influenced by selfvibration characteristic of the bridge and spectrum characteristic of seismic, taking an typical threespans continous beam bridge for example, the BoucWen restoring force model is adopted to simulate the nonlinear hysteric characteristic for LRB, the Takeda three linear model is adopted to simulate the nonlinear for pier, and the timehistory analyses procedure of the Newmark and the RungeKutta iterative strategy used to solve the increment form nonlinear governing equation of motion is programmed. Using the procedure and combining calculation example analyses isolated effect of isolated bridges with LRB influenced by structure selfvibration characteristic and seismic excitation spectrum characteristic. The consequences indicate that structure selfperiod and spectrum component of seismic excitation have a significant influence on the isolated effect of LRB; the LRB is not suitable for isolated. The impulse pulse with easiest to happened seismic of lowfrequency should not take LRB as isolated equipment of bridges.

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Analysis on Dynamic Response of a Shield Tunnel Under Internal Explosion Loading

WU Yubin，Liu Rushan, TIAN Zhimin

. 2011, (7): 107-111.

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In order to study the dynamic response characteristics of segment joint of shield tunnel under internal explosion loading,
a three dimensional FEM model of dynamic response of a typical metro running shield tunnel is proposed. This model can simulate the contact effects of segmentsegment, segmentbolt and segmentsoil based on the nonlinear dynamic analysis software LSDYNA. The failure mechanism of a shield tunnel under internal explosion loading is analyzed and the failure characteristics of segment and bolt are revealed. The analysis results show that the blastresistant characteristics of shield tunnel can be improved by enhancing bolt strength and tenacity.

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Removal of Microcystin from Raw Water by Immobilized Microcystindegrading Bacteria

CHEN Xiaoguo，CHEN Bo，HU Fan，YANG Li

. 2011, (7): 112-115.

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The removal of microcystin LR (MCLR) by immobilized MCdegrading bacteria was investigated with sodium alginate as the immobilization matrix. The results show that MCLR (5 mg/L) was degraded to below the detection limit within 4 days. Temperature could affect the activity of the immobilized bacteria, and the rates of MCLR biodegradation increased with increasing incubation temperature. The addition of glucose, nitrogen or phosphorus and the initial pH value in cultures had no obvious effect on the biodegradation of MCLR. These results suggest that immobilized MCdegrading bacteria are resistent to the fluctuation of environmental conditions and can be used for the removal of MCLR in practical raw water treatment.

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Application Research of the Modified Ceramics Filter Media in the Treatment of Oily Wastewater

LI Meng，ZHONG Chen

. 2011, (7): 112-115.

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The new kind of ceramic filter media prepared by the waste sludge of Wuhan Iron and Steel Corporation was modified by hydrogen silicone oil. The modified ceramics filter media was used to treat the hot rolling wastewater of Wuhan Iron and Steel Corporation. We can find lots of advantages of the modified ceramics filter media from the contrast experiments with the quartz sand, such as the contrast experiments, the treatment of oil, treatment of suspended matter and the head loss experiment. We analyse the mechanism of the treatment of oil and find out the best operating conditions of the treatment of oily wastewater.

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Impact of Ages on Deformation Properties of Municipal Solid Waste

SUN Xiuli, JIN Liqiao,LI Zhihua

. 2011, (7): 120-123.

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In order to investigate the longterm deformation properties of municipal solid waste(MSW), a series of creepdecomposition comparative tests were conducted in the laboratory under different biodegradation conditions. Based on the experimental results, characteristics of strain changing, void ratio changing and the relationship between stress and strain of MSW were studied. An exponential model was proposed to describe the streestraintime relationship and the compressibility of MSW. The model parameters could characterized the compression mechanism. It can be concluded that the creep properties of MSW are not related with stress but also with decomposition of organic fraction and time by considering the stressstrain curve. Test results have proved that the creepdecomposition experimental test offered a new method for investigating the deformation properties of MSW in laboratory.

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Research on the Experiment of the Multi Vibration Screen About the Screening Efficiency in the Asphalt Mixing Plant

MENG Cairu, FENG Zhongxu, LI Lei, LI Xuewu, LI Changhuan

. 2011, (7): 124-128.

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The vibration screen was tested about the screening efficiency in the asphalt mixing plant. The vibration parameter and the stress parameters on the vibration screen were tested. The amplitude of each point was detected and analyzed, and then the distribution of the amplitude was obtained. The low screening efficiency is mainly due to low amplitude and different amplitude in the different locations in the screen. The method of increasing the vibration force was used to increase the amplitude and improve the uniformity amplitude of the screen in order to increase the amplitude of screening efficiency.

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Research on Wind Power Control Using UPFC

TANG Aihong. LU Jun, ZHOU Xinmin, JIANG Desheng

. 2011, (7): 129-132.

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After deducing the wind turbine mathematical model and the wind generator equivalent mathematical model, this paper designs the series side control system for the unified power flow controller based on the area equivalent criterion and the principle of the power stability systems. The increment of the rotor speed is isolated and compensated and then be connected into the inputs of the general control system of the unified power flow controller for the regulating of the real power, the regulated real power is used to control the pitch angle and the power of the wind farm. The simulations results based on the ramp wind show, the control system proposal in this paper can make the unified power flow controller not only damp the real power variation and the rotor speed of the wind generator but also maintain the voltage of the terminal of the wind generator.

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Research on Adult Image Detection Using Zernike Transform and Support Vector Machine

LIU Chun, XIE Changsheng, ZHU Guangxi, WU Lun

. 2011, (7): 133-137.

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For constructing pornographic image detection and filter technology based embedded platform like set top box, this paper presents a combined method based highlevel semantic characteristic and aims to identify specific shape feature which integrated Zernike moment transform and multilevel template match, further the pixel distribution features of possible shape areas are detected by support vector machine. The test results show that when combined fast computing algorithm, the system performance can meet the real time requirement and the correct recognition is higher than traditional method based on skin area detection, at the same time the error recognition rate is decreased.

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Research on MDS Selection Scheme in Distributed Object Storage System

SHAN Ying， YAO Nianmin

. 2011, (7): 143-146.

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A novel scheme of metadata server (MDS) selection of read/write operation in distributed object storage system (DOSS) called OTM is proposed. In our scheme, MDS selection scheme related to read/write (r/w) operation involves two cases: the first is establishment of MDS selection model and the second is implementation of MDS selection topology, while geographic region autonomy character of requests and MDS is considered sufficiently and the establishment issue of the topology structure in OTM is treated as a similar kcentre problem which is a NPC problem. Then r/w operation is provided by obtaining topology tree. Experimental results show that OTM scheme can provide excellent service for r/w operation in DOSS.

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Construction of Biometric Secure Sketch： Theory and Practice

LI Ximing, YANG Bo, GUO Yubin

. 2011, (7): 147-151.

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Based on fingerprint database, extraction and quantization of biometric vector is studied, the change of performance after quantization is discussed and theoretic bound of genuine rejection rate and imposter acceptance rate are given. Using BCH code, construction of secure sketch is made and under different error correction capability genuine rejection rate and imposter acceptance rate are calculated, the distance between theoretic bound and practical parameters is discussed, problems of capability and security of secure sketch are pointed out.

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EEG Acquisition System Based on MCU and Hypothesized Instrument

YANG Minglong，LIU Quan，AI Qingsong

. 2011, (7): 152-156.

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The EEG acquisition system is put forward based on the character of electrical signal of human scalp. The electric circuit that consists of biological signal preamplifier circuit, filter circuit, 50 Hz frequency trap circuit can effectively filter the signal noise and amplify the EEG signals. Simultaneously, the system in which the technology of highspeed sampling and serial communication based on MSP430 microcontroller and PC software developed on LabVIEW are adopted could complete the work of digital EEG signal acquisition and realtime waveform display at low cost. The result of system circuit simulation and experiment of data acquisition test indicates that the system put forward could process human bioelectricity signal effectively in real time, and it could be a support for BCI research.

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