Journal of Wuhan University of Technology

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Conducting Mechanism of Nano Electrode Materials for Lithiumion Batteries

HAN Chunhua, LI Shuo, MAI Liqiang, HAN Jiuhui, NIU Chaojiang, LI Jiantao

. 2011, (9): 1-10.

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Nanoscale materials have attracted lots of attention for their superiority in the application of lithiumion batteries electrode materials. However, during the chargedischarge process the structure of materials is destroyed, causing the decrease in conductivity and battery performance. This review probes the reason of the conductivity decrease, and puts forward two methods (doping and coating) to improve the nanomaterials’ conductivity, and discusses the enhanced performance as well.

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Synthesis and Characterization of Mo Oxide/Polymer Coaxial Nanowires

LI Shuo,HAN Chunhua, HAN Jiuhui, CHEN Wei

. 2011, (9): 11-15.

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This article introduces the synthesis of coaxial nanowires via-in-situ polymerization of organic monomers on the surface of assynthesized MoO₃ nanowires to fabricate MoO₃/polymer coaxial nanowires. The assynthesized nanowires were characterized by Xray Diffraction, Fourier Transform Infrared Spectroscopy, Field Emission Scanning Electron Microscopy and UVvis spectrum. The results indicate that the polymers are uniformly coated on MoO₃nanowires, and the coaxial nanowires have great potential in photoelectric effect application. This method also provides a possible polymercoating synthesis route, which can be extended to many other materials.

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Leaching Performance Study on Synroc Perovskite Immobilization of Simulation Uranium

ZOU Qiulin, ZHAO Faxiang, LAI Zhenyu, LU Zhongyuan, PAN Sheqi, ZHAO Yanhong

. 2011, (9): 16-20.

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Using high temperature solidstate method, simulating uranium with cerium, the Cedoped synroc perovskite has been synthesized at 1 300 ℃ with heat preservation 2 h. The phase composition has been investigated by XRD. Antileaching performance has also been researched with MCC1 and the Product Consistency Test. Results show that synroc perovskite can load cerium less than 18.94%, which is about 15%~20% (mol%) structure unit. The incorporation of Ce has promoted sintering and made the perovskite crystal lattice more stable. While the synroc loads as high as 35.04% weight of cerium, the accumulated leaching fraction of Ca is only 1.87×10^-5 cm in 90 days, the leaching rate and accumulated leaching fraction of Ce are only 0.27×10^-8 cm·d^-1, 6.55×10⁷ cm in 90 days. The results indicate that the perovskite solidification has excellent chemical durability, and when the dosage of nuclide cerium is close to the saturation capacity of perovskite, the leaching performance is the best. 

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Study of Hydration Course and Durability of Cementbased Multivariate Composite System

LUO Zhongtao，MA Baoguo，YANG Jiujun，ZHOU Ying，XIAO Yuling

. 2011, (9): 21-23.

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Through the analysis of hydration production and microstructure character of multivariate composite system, the effect of superposition and complementarity of multivariate composite system towards its workability and durability was studied. The result shows: the course of slag and fly ash hydration to release and consume OH- has accelerated the early hydration process, thereby eliminating the potential instability to make its postperformance stable. Under the premise of the high volume, the synergistic of multivariate composite system is helpful for the effectively improvement of its cement product’s durability.

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Study of Magnetic Field Sensing Based on Magnetic Fluid and Long Period Fiber Grating

WU Lin, ZHOU Ciming, DING Li, WANG Dongli, ZHANG Wenju

. 2011, (9): 24-27.

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The long period fiber grating which can be used as an ideal fiber optical sensitive element is a late model of passive optical components. It is sensitive to the refractive index surrounding its cladding. The magnetic fluid has an obvious magneticoptical effect, in another word, its refractive index will be changed by an external magnetic field. Sensing head based on both magnetic fluid and long period fiber grating has been produced. A new sensing method for measuring magnetic field has been presented. The principle of long period fiber grating’s refractive index has been deeply analyzed, and the experiment which has proved the principle has been done. The obtained results show that magnetic field sensing based on magnetic fluid and long period fiber grating could be applicable for magnetic field and current sensing.

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Study of the Effect of Grain Size on the Properties of Ti₃AlC₂/TiB₂Composite Material by Image Analysis

SONG Jinghong， LU Xuefei，MEI Bingchu

. 2011, (9): 28-32.

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The Ti₃AlC₂/TiB₂ composites with different volume content of TiB₂ were synthesized and its grain size and distribution were charactered by DS5M image analyzer. The results indicated that the highest density was obtained for the 10% volume content of TiB₂ and decreased gradually with the increase of TiB₂ content. The incorporation of TiB₂ content may have a negative effect on the densification process because the raw materials need higher temperature and longer time to react during SPS sintering. The grain of the Ti₃AlC₂/10%TiB₂ composites was structured in a layered form and uniformly distributed. The analysis of the microstructure was consistent with the results of the macro properties. 

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Preparation and Characterization of Porous Polyphosphates Bioceramics

LIU Bin, DONG Yinsheng, WANG Ling, SU Jing, YAO Yijun, LIN Pinghua

. 2011, (9): 33-36.

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The porous ceramics were prepared by the foam impregnation technology using Al₂O₃-MgO-P₂O₅ as binder. Porous properties, crystalline phase and mechanical property were investigated by using scan emission microscope (SEM), Xray diffraction (XRD), archimedes drainage method, and compression tests. It showed that Al₂O₃-MgO-P₂O₅ phosphate not only promoted sintering of ceramics, but also improved coating of ceramic slurry over the foams uniformly. The obtained ceramics have connective, uniform pore structures with macropores about 200~500 μm diameter, micropores about 3 μm diameter and average porosity of 85.9%±1.6%. Porous ceramics were polyphosphates composed of HA, β-Ca₂P₂O₇ and few Mg₃(PO₄)₂, Al(PO₃)₃ and the average compressive strength was （1.04±0.15）MPa.

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Preparation of Spherical Silica Powder by Oxygenacetylene Flame Method

YANG Yanqing, XU Liang,JIN Hongyun

. 2011, (9): 37-40.

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Spherical silica particles were obtained by the process of heating nature irregularly shaped silica powders under Oxygenacetylene flame condition. The process variable of preparing spherical silica powder is the flow rate of O₂0.8~1.2 m³/h, the flow rate of C₂H₂ 0.6~0.9 m³/h. The performence of before and after spheroidization powders were characterized by XRD and SEM . The effect of particle size and the feeding rate on spheroidization efficiency were studied. The result showed that after spheroidization, the rate of spheroidization was above 95%. With the decreased of the particle size and the feeding rate, the spheroidization efficiency and the rate of amorphous were better than before, especially the particle size was beneath 10 μm.

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Research of Technological Parameter of Air-entrained Concrete Made of Phosphorus Tailing

YANG Liyuan，WAN Huiwen, LI Jie

. 2011, (9): 41-44.

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The paper researches the influences of airentrained concrete performance through changing the amount of materials, water/binder and temperature and so on, and discusses the strength’s mechanism. The results show that a good billet body can be made at 45 ℃ when over 65% of phosphorus tailing, 6% of Portland cement and 0.14% aluminum powder are mixed with 0.64 of water/binder. In the condition of steam pressure, the volumetric weight of products is about 600 kg/m³and compressive strength is above 3.7 MPa.

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Theory of Fractal Applied to the Compression Strength Model of Semirigid Base

LIN Ruiyu，SHA Aimin

. 2011, (9): 45-49.

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Aggregate is the most important part of semirigid base material, different gradation compositions influence the compression strength. Taking cement stabilized aggregate as an example, the paper researches the feasibility of fractal theory on gradation composition and calculates each correlation to material composition of cement stabilized aggregate for unconfined compression strength under the database. Then the strength prediction model of semirigid base is given with gradation of aggregate, the dosage of cement, water content, the type of cement and aggregate crusing value. The paper simultaneously concludes the relation on different ages of semirigid base, which can not only predict strength by known material parameters, but also foresee the short age performance by the long one. This paper gives a good method on the whole design of pavement materials and structures.

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Study on Pavement Performances of BRA Modified Asphalt Mixture

LI Ruixia, HAO Peiwen, WANG Chun, ZHANG Qing

. 2011, (9): 50-54.

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In order to analyze the pavement characteristics of Buton Rock Asphalt(BRA for short ) modified asphalt mixture, the contrast tests of pavement performances were studied for base asphalt mixture, BRA modified asphalt mixture with different contents and SBS modified asphalt mixture. The results indicate that BRA can significantly improve the high temperature stability, water stability, low temperature anticracking and fatigue property of asphalt mixture.By comprehensive consideration the changes of performances and economic factors, the paper recommends reasonable content of BRA is 3.5%.

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Timefrequency Deflection Calculations Research of Partially PC Grider Bridge with the Effect of Cyclic Loading

LI Shian，HE Shuanhai，ZHAO Yu

. 2011, (9): 55-60.

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This paper is focused on the longterm deflection of partially prestressed concrete bridge with the effect of cyclic loading.Study on fatigue load spectrum and forecast traffic volume, the calculation mode that is combined with concrete structure fatigue test of partially prestressed concrete considering cyclic loading is given.The real bridge’s longtime deflection is also calculated in this paper.The results show that deflection under the action of cyclic loads mainly happens in the first two years after the bridges operations.The action time has been reached 2 million during this 2year period. When initial load caused moment M<M_cr,deflection value with cyclic lateral loads considered is increased by 22.3%~27.2% than that is not considered .On the other hand, when M≥M_cr,there is significant residual strain happening,which deflection value with cyclic loads considered is increased by 38.9%~42.6% than that is not considered. Significant residual strain is existed significantly in concrete beam.This calculation method is clear.

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Travel Path Model and Case Study Under Traffic Congestion Environment

LI Mi，WANG Xia，LI Jinliang

. 2011, (9): 67-71.

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Traffic congestion usually occurs in the local road network, moreover, it has big possibility to arouse second congestion. Based on the Davison modified model of BRP function and the definition of road service standard, this paper analyzed the runtime of road network. Under the complexity of road network, the optimal path chosen in normal traffic environment maybe not the optimal solution in traffic congestion environment because of the differences of road service level and dynamic development of traffic flows in the crossroads. Considering the reliability of the chosen path, this article built a static traffic distribution model to analyze urban transportation with macroscopic perspective, and provided suggestions for relieving urban traffic congestion.

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Intelligent Speed Monitoring Method and Its Experimentfor Vehicles Based on RFID

QIU Zixue, YAN Kui,YUAN Jiang, YANG Yongjie, XU Zhongyuan, ZHANG Guoan

. 2011, (9): 71-66.

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To realize realtime monitoring the actual speed for vehicles and supporting early warning for the vehicle driver, the intelligent speed monitoring method and system were designed for vehicles based on radio frequency identification (RFID) technology. The actual velocity of vehicles is acquired by a speed sensor and acquisition and processing module, and identity information of the vehicle and its actual speed are sent to readers installed along the roadside through sensortag. When the vehicle drives over the limited speed, the system can voice alarm to the driver, the vehicle identity and its actual speed are transmitted to the control center by readers connected with network, where these information is stored and shown realtime. Experimental results show that this system can acquire vehicle speed accurately and transmit and process it in realtime, and it can avoid effectively traffic accidents caused by speeding.

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An Immune Genetic Routing Optimization Algorithm

ZHANG Yanmin，RUI Xiaoping

. 2011, (9): 72-76.

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Optimizing routing appropriately can increase the efficiency of logistics distribution. Aiming at the poor ability of local search in GA(Genetic Algorithm), a new IGA(Immune Genetic Algorithm) which considers of the features of GA and IA(Immune algorithm) is presented. Methods of immune examination and immune selection are presented to advisably modify GA, and the steps of seeking the appropriate route by IGA are expatiated. The results of our examples show that the convergent speed of IGA is faster than GA and our new algorithm is reliable and suitable for routing optimization.

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Study on Optimization of Yard Truck Dispatching Based on Stacking Capacity in Container Yard

XU Delei,HAN Xiaolong，LIANG Chengji

. 2011, (9): 77-81.

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As yard truck is the most popular transportation equipment, reasonable yard truck dispatching strategy would improve the operation efficiency and competitiveness of container terminals. By considering the stacking capacity of container yard, we formulate a twostage model about the yard truck dispatching. In stage one, by considering the operations of the special containers, an optimization model is constructed to obtain a stacking strategy of containers and the objective is to minimize the total travel distance of trucks. In stage two, a yard truck dispatching model was formulated to minimize the makespan of containers operation based on the result of the model in stage one. The performance of numerical experiment demonstrates the effectiveness of the model.

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The Verification Method of Vehicle Driving Tendency Recognition Model Based on Driving Simulated Experiments Under Free Flow

ZHANG Yuanyuan，WANG Xiaoyuan，ZHANG Jinglei

. 2011, (9): 82-86.

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Realtime recognition of the driving tendency is the key theory and technology in achieving the intelligence of auxiliary autodriving, especially the intellectualization of the active security warning system. Driving data of different drivers under the free flow are obtained through the interactive parallel driving simulated experiments. The established dynamic recognition model of driving tendency is verified and the verified results are compared with the results of psychological questionnaire tests. Results show that the established identification model is feasible, it can realize realtime recognition of the driver tendentious types under free flow and provide theoretical basis for the realization of personalized automobile active safety system.

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Experimental Study of Tshaped Concretefilled Steel Tube Columns Under Axial Compression Loading

ZHAO Yi, JING Hang

. 2011, (9): 87-90.

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In order to improve the mechanical capability of Tshaped concretefilled steel tube columns, two specimens, having reinforcement ribs and without, are tested. Their longitudinal loads versus displacement relationship curves are measured and the failure modes are also observed and analyzed. The functions by reinforcement ribs are studied. The results of the experiment show that better ductility can be obtained by the specimen with reinforcement ribs. A finite element analysis model is developed using ABAQUS and validated by the test results. The parameters are analyzed to the mechanical behavior of Tshaped CFST.

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Static Performance Analysis on Combined Truss with Steel Tube and Concretefilled Steel Tube Based on Total Strain Crack Constitutive Model

LIN Hongyu,LIU Yongjian,ZHANG Shuyun

. 2011, (9): 91-96.

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Based on the total strain crack constitutive model, finite element model on three trusses was established by the finite element procedure MIDAS/FEA and the analysis was executed in order to verify the validity of constitutive model and study the static performance of combined truss. The results show that the finite element model based on total strain crack constitutive can reflect the static performance of combined truss and can execute the affective parameters analysis, which can offer the theory evidence for its engineering application. The failure of three trusses is due to the joint failure, however, the failure modes were different and were changed by the concrete filled in chord. The bearing capacity of three trusses were controlled by the joints and the strength and stiffness of joints were increased by the concrete filled in the chord.

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Experimental Research on Shrinkage of Repairing Concrete Restrained by Old Concrete

CHEN Feng

. 2011, (9): 97-100.

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With the selfcompacting concrete as new concrete, the restrained shrinkage experiment of new and old concrete is conducted in order to study the shrinkage laws of repairing concrete restrained by old concrete. The influence of concrete strength and disposed interface is researched and the free shrinkage specimens are also made for comparison. Based on the test results, the shrinkage stress of new concrete is got of analysis. The calculating formulae of restrained shrinkage of new and old concrete are put forward by hyperbola function in this paper. It can be taken as reference to the design of the strengthened concrete structure.

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Response of Torsional Vibration Studies of Concrete Spatial Frame Joint on Twodimensional Seismic Performance

LI Xuhong ， FANG Zhenzheng

. 2011, (9): 101-106.

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Quasistatic experiments of concrete spatial frame joints are carried out under biaxial cyclic lateral loading. The torsional phenomenon of different joint types under biaxial cyclically increasing horizontal displacement loading is analyzed, and the shear mechanism is studied from the angle of stress based on finite element analysis. In this paper, the influence comparison on torsional phenomenon of different joint types are given, the further analysis shows that the response of torsional vibration is the main influence factor on shear capacity of core joints, and the results of this study can be used to provide suggestion for the design rules of joint core considering torsion effect.

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Static and Dynamic Analysis of Grid Structure with Central Open Hole

HUANG Jun, DAI Shaobin, ZENG Hui, LIU Jixiong

. 2011, (9): 107-110.

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As the research object, the doublelayer pyramid grid structure with a rectangular opening in the central is studied under the elastic support. The analysis of static and dynamic behavior of space grid and space grid with opening is conducted by the FEM of SAP2000, and then, the differences between the two results are compared. The variation of the internal force and displacement is obtained. The results indicate that the distribution law of chord internal force between the space grid and space grid with opening is significant different, however, no obvious differences appear in the web member; the distribution of dynamic and static internal force of the grid with open hole represent consistently; reinforcing the hole of grid can improve the stiffness notably.

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A Strain Signal Wireless Collector Used in the Intelligent Tower Structure System

XIAO Chun, CHEN Bian, CHEN Jing，LIU Jiang

. 2011, (9): 111-114.

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According to the needs of strain data acquisition and transmission of intelligent tower structure system, the sensor network technology is adopted to collect the strain data of the intelligent tower structure system. A lot of sensors and backbone transmission network has been connected. Between backbone transmission network and sensors, ZigBee wireless network technology with low power consumption and lower cost has been adopted to connect to network. A strain signal wireless collector used in the intelligent tower structure system based on ZigBee network has been developed. It is comprised of strain sensors, acquisition module, processing modules and send module. The temperature drift and nonlinear of the strain sensor are weakened. And software algorithm has been used to avoid the wireless data packet to loss. The distance communication in spacious field is above 300 m.Test results show that the collector can 〖JP2〗measure realtime data strain of a single tower with a lot of nodes, many towers and complicated topographical conditions.

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Study of the Arsenic Adsorption Properties on Modified Manganese Ore of Iron Ore

HUANG Yongbing, LI Xiaojuan, WANG Lili, CHEN Xiaoguo, LIU Xiuying, TU Shuxin

. 2011, (9): 115-119.

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The management and restoration of Arsenic pollution, which is urgent to be solved currently, has become China's environmental problems. This paper studies various factors which affect the removal efficiency of arsenic on iron modified manganese ore. The adsorption isotherm of modified and unmodified manganese ore has also been studied. The results show that the optimal concentration of iron modification is 20 g/L. The percentage of As(Ⅴ) removing of modified manganese ore is up to 98.34%, while the As(Ⅲ) removal rate is only 85.11% under the conditions of that the dosage of modified manganese ore is 0.100 0 g, reaction temperature is 20 ℃, reaction time is 60 min, pH 3.0, the concentration of arsenic in water samples is 200 μg/L. The existence of Ca²⁺，Fe³⁺ in water can enhance the trend of arsenic removal, while SiO^2-₃，CO^2-₃，HCO^-₃ can obviously reduce efficiency of the arsenic removal by modified manganese ore. Orthogonal experiments show that the effect of SiO^2-₃greater than CO^2-₃, the temperature and time of reaction has less effect on the removal. The adsorption isotherm of modified and unmodified manganese ore shows that the saturated adsorption quantity of As(Ⅴ) and As(III) on modified manganese ore is respectively 1.016 and 2.112 mg/g in conditions that reaction temperature is 20 ℃, the dosage of modified manganese ore is 0.100 0 g, 96.77% and 87.23% higher than that by unmodified manganese ore.

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Treatment of Methyl Orange and Secondary Effluents by Simulation Photocatalysis Floating Bed

WANG Enqiang, XU Shihong, LI Ye, LI Dengxin

. 2011, (9): 120-124.

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A simulation photocatalysis floating bed reactor was assembled by short quartz tube loaded TiO2 film, which showed a good catalytic activity. The effects of some parameters on the degradation, such as the annealing temperature, load times and recycling were studied. The degradation experiments of methyl orange indicated that the three layers TiO2 films annealed at 600 °C exhibited a good repeatability for photocatalytic activity. SEM and XRD were used to characterize the structure of the TiO2 films. The results indicated that the TiO2 films of 1 μm were loaded on short quartz tube in the photocatalysis floating bed reactor. The degradation experiments of secondary effluents by simulation photocatalysis floating bed indicated that the TOC, COD and UV254 reduction rate were 41.25%, 78.26% and 87.12%, respectively. By comparing the water sample before photocatalysed to after with FTIR technique, the functional groups of organic pollutants in secondary effluent have been effectively broken down by photocatalysis floating bed.

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Adsorption of Lead(Ⅱ)onto Iron Oxidemodified Vermiculite

WANG Lingling, WANG Feng, WU Hong

. 2011, (9): 125-129.

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〗Iron oxidemodified vermiculite was prepared by adding vermiculite into the basic solutions of Fe(NO3)3. The adsorption kinetics and thermodynamics of Pb2+ adsorption onto the iron oxidemodified vermiculite were studied to assess the adsorption mechanisms. The kinetics of iron oxidemodified vermiculite adsorption can be well described by pseudosecond order kinetics model. The equilibrium data were analyzed by the Langmuir and Freundlich model, which revealed that both Langmuir and Freundlich model were suitable to describe Pb²⁺ adsorption onto the iron oxidemodified vermiculite.According to the dependence of thermodynamic equilibrium constant on temperatures, the thermodynamic parameters associated with the adsorption process were calculated. The negative values of ΔG0indicated that the overall adsorption processes are spontaneous. And the positive value of ΔH0showed that the adsorption processes are endothermic in nature and the adsorption mechanisms are dominated by physical adsorption. The adsorption of Pb²⁺ by iron oxidemodified vermiculite is changed not obviously at different pH values.

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Capacity Loss Analysis of Lithium Iron Phosphate Power Batteries Group

HU Yinquan，LIU Heping，ZHANG Yi，LIU Kaifeng

. 2011, (9): 130-134.

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Chargedischarge principles and selfdischarge of lithium iron phosphate (LiFePO4) are analyzed, and chargedischarge experiments are carried out. According to the change of single battery capacity in using, capacity fading of single battery is discussed, and capacity fading of single battery on battery group chargedischarge performance is analyzed. Accordingly, a method of slow batteries group capacity decay with equalization device is proposed. Experimental results show that this new management method of batteries group slows the rate of batteries group capacity decay, and all batteries can be fully charged, which is conductive to the effective use of the batteries group, and extends cycle life of batteries group.

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Study on Exhaust Noise Control of the Diaphragm Air Pump

TANG Yaoyang, LIU Zhien, LI Bing, WANG Yiyuan, LIAO Wu

. 2011, (9): 135-139.

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In order to reduce the working noise of the diaphragm air pump, the noise characteristic of the pump is studied, and the exhaust noise is determined as the main contributor to the overall noise after the analysis; meanwhile, to meet the demands of low exhaust backpressure, high noise reduction and small working room, the double layer microperforated mufflers are designed. The test of the three different mufflers shows that this kind of muffler can reduce the exhaust noise at the level of 8 dB (A), which reduces the overall noise to the accepted level.

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Research on Security of Routing Protocols for Battlefield Wireless Ad Hoc Networks

ZHOU Ming, YANG Huabing, LI Fangmin, WANG Min

. 2011, (9): 140-145.

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Battlefield wireless Ad Hoc networks are independent from fixed infrastructure and feature flexible and quick deployment. However, battlefield wireless Ad Hoc networks are not widely applied for security concerns. This paper lists types of attacks faced by secure routing protocols for battlefield wireless Ad Hoc networks and describes the design requirements on secure routing protocols. In addition, it analyzes the widelyapplied secure routing protocols for wireless Ad Hoc networks in details and compares their attackdefending capabilities. The result indicates that no single protocol can defend against all kinds of attacks and that initiation of common security criteria for all secure routing protocols is the most urgent issue at the moment. At last, this paper proposes some directions for future research and design of secure routing protocols for battlefield wireless Ad Hoc networks.

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InSAS Interferometric Phase Estimation Based on Joint Pixel Model

BAI Shengxiang, TANG Jinsong，ZHANG Sen

. 2011, (9): 146-150.

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A novel joint data vector formulation method for InSAS interferometric phase estimation is proposed in this paper. The method does not need to calculate the noise subspace dimension of the covariance matrix in estimating the InSAS interferometric phase, thus avoiding the effect due to the inaccuracy estimate of the noise subspace dimension. Computer simulation and the real data of InSAS results show the validity and high efficiency of the method.

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Recommendation Algorithm Based on Item Rating Prediction Using Bidirectional Association Rules

LIU Meilian, LIU Tongcun,ZHANG Feng

. 2011, (9): 151-156.

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A new recommendation algorithm based on item rating prediction using bidirectional association rules was designed to reduce the sparsity of user rating data through the analysis of item’s spatial association in transaction database. Bidirectional association rules were used in this algorithm to mine the interrelated items in transaction database to find out the association set of target item, and then to predict the rate of target item by the rated items in association set. Finally, collaborative filtering algorithm was used together to provide recommendation services for users. When the confidence level changes from 60% to 90% and the support level changes from 5% to 10%, the experimental results show that the number of association rules decreased gradually with the increase of the confidence support level, and the recommendation accuracy has been improved gradually. In order to compare with traditional recommendation algorithm, the confidence level 80% and support level 7% were chosen to continue our experiment. The result shows that the algorithm designed in this paper can more accurately find out the association set of target item, the recommendation efficiency and accuracy are both obviously superior to traditional recommendation algorithm.

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Research on the Application of Sensors Information FusionControl System in the Conservatory Monitor

YANG Fan, CHENG Wen,XIA Yibing, DU Siping,XIAO Bei

. 2011, (9): 157-159.

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The realtime monitoring and remote controlling to growing environmental parameters of crops, such as temperature, humidity and illumination, which is a significant method in agricultural modernization. The system takes the ARM embedded microprocessor 2410 as the hardware platform, combines with Linux operating system and ARM Developer Suite (ADS) 1.2 integrated development environments. Moreover, it forms a measurement and control system of multisensor information fusion, which based on the DS evidence theory and the BP neural network algorithm. The BP neural network provides some pieces of evidence; while DS evidence theory could reduce the nondeterminacy. With the application of both multisensor information fusion algorithms, finally, the reliability is 93.47% of section, with the basic probability fusion of three sensors in three different moments. Through the simulation result of the experiment, we can see a higher recognition rate and good application prospect of the system.

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Point Cloud Accuracy Analysis of Threedimensional Reconstruction System Based on Structured Light

LIN Zhixiong,LE Kai, HU Hualiang,ZHENG Shunyi,LI Wenfang

. 2011, (9): 160-164.

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For threedimensional reconstruction system, point cloud quality is very important. This paper evaluates the quality of point cloud by two aspects of the accuracy of the single point cloud and the matching effect of point cloud. First to calculate the spatial point accuracy by comparing reconstructed point cloud and 3D coordinates calculated by the photograph of the parameters and image coordinates of calibration board marks. Then reconstruct the calibration board to carry out error analysis of flatness. A professional inspection software was used to match point cloud and generate error and accuracy report. Repeated experiments show that point cloud produced by PHOTOSCANSHOP structured light system has a smaller error and registration can achieve better accuracy.

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