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Journal of Jiangsu University(Natural Science Eidtion)

	2011 Vol.32 Issue.6 Published 2011-11-10

	Article

Article

	621	Image segmentation of maize haploid seeds based on BP neural network
		ZHANG Junxiong, WU Kebin, SONG Peng, LI Wei, CHEN Shaojiang
		Based on BP neural network of maize haploid seeds，an image segmentation method was proposed to research 1050-37 corn with genetic marks. According to color features，corn seed images were divided into three color patterns of purple area, yellow area and white area. Different color features of normalized rgb and HSV color space were analyzed, and 7 features were chosen as input parameters to establish a BP neural network model with 3 layers to achieve effective image segmentation of maize haploid seeds. The experiments show that the classification accuracies of the model are 97.61% for purple marks area, 93.34% for yellow area and 94.09% for white area，respectively. The purple marks area acquired by BP NN is effective and reliable for the identification of haploid kernels and hybrid kernels.
		2011 Vol. 32 (6): 621-625 [Abstract] ( 1887 ) [HTML 1KB] [ PDF 1469KB] ( 1982 )

	626	An IMM particle filter tracking algorithm based on farmland topography
		BAI Xue, WANG Deming
		According to the regular farmland topography， a new tracking algorithm with low cost and high precision was proposed. Based on the optimized driving routes of agricultural vehicle, two maneuver models were determined for farmland work, and the farmland work target was tracked by interacting multiple model (IMM) particle filter. Considered the farmland topography as a factor in particle filter algorithm, the particles which cross ridges were ticked out to improve the estimated precision. The improved IMM particle filter algorithm was used to simulate and analyze the moving target. The results show that the proposed algorithm can improve the positioning tracking precision effectively only by general low cost GPS for the navigation of regular farmland topography.
		2011 Vol. 32 (6): 626-630 [Abstract] ( 1658 ) [HTML 1KB] [ PDF 1539KB] ( 1564 )

	631	Composition and structure characteristics of walnut proteins extracted by different techniques
		MAO Xiaoying, HUA Yufei
		The composition and structure characteristics of walnut proteins were investigated by different extracted techniques. The results show that the walnut protein contents are 90% by alkaline extractionisoelectric precipitation technique，and 70% by isoelectric precipitation technique，respectively. The secondary structure of highly ordered α-helix structure is damaged for some extent， while β-turn and disordered structure are increased. Subunits and amino acids of walnut protein by the extracted techniques are not damaged. The two extracted techniques show high protein yield with small damage to protein structure and components.
		2011 Vol. 32 (6): 631-635 [Abstract] ( 1653 ) [HTML 1KB] [ PDF 1679KB] ( 2906 )

	636	Identification of tea based on mineral content and support vector machines
		LI Qingguang, LI Xiaozhong, ZHONG Fang
		In order to identify variety and origin of teas, a method was proposed based on mineral content and support vector machines(SVM)．The contents of Mg，Al，P，Ca，Mn，Fe，Cu，Zn and Ba were analyzed by ICPOES and were normalized.The data were collected randomly as learning samples for designing and training multielement classifier to identify tea variety and origin by SVM. The results show that classification method which is based on ″one versus one″ multiclass support vector machine has better classification ability and stronger antijamming capability than that of cluster analysis．For small samples, the tea variety and origin identification accuracy can reach 91.67%， which illuminates that the method is effective for indentifying tea variety and origin．
		2011 Vol. 32 (6): 636-641 [Abstract] ( 1462 ) [HTML 1KB] [ PDF 1540KB] ( 1745 )

	642	Application of magnetic sensor in actuator motor of vehicle active front steering system
		GAO Feng, WANG Ligang, LIU Guoliang
		In order to apply magnetic sensor in brushless DC motors actuator of vehicle active front wheel steering (AFS) system with variable gear ratio (VGR) mechanism, signal processing algorithm for brushless DC motor (BLDCM) control system was proposed based on the analysis of system requirements for position sensor and working principle of HMC1512 sensor. Three-closed-loop control model of BLDCM and signal processing model were established in Matlab/Simulink. Based on the rotation angle from the simulation of control model, rotor position, rotation angle and rotation speed were calculated according to the signal processing model, and compared with the corresponding signals according to three-closed-loop control model. The results show that the calculation signals are basically consistent with the corresponding signals.It is proved that the algorithm can be used to identify the rotor position and calculate the rotation angle and rotation speed, which provides basis for the application of HMC1512 in the actuator motor of AFS.
		2011 Vol. 32 (6): 642-646 [Abstract] ( 2242 ) [HTML 1KB] [ PDF 2038KB] ( 2177 )

	647	Simulation of vehicle vibration with excitation of rail height irregularity
		ZUO Yanyan, CHANG Qingbin, GENG Feng, YANG Jian
		The influence of track irregularity on vehicle body vibration was investigated to evaluate the vibration situation of vehicle body and analyze the stability level. A mechanical model for vertical vehicle body vibration was established to introduce motive differential equations. The track power spectrum in vertical space domain was transferred into the spectrum in timefrequency domain to establish 3D model of vehicle body by Pro/E software and wheelrail model by SIMPACK. The train simulation model was also introduced by SIMPACK. The vertical vibration response of the vehicle body was calcuated with height irregularity as excitation function. Based on the vehicle response, the stability level of travelling vehicle was evaluated in time domain, and the composition of vehicle vibration acceleration power spectral density was analyzed in frequency domain. Referred Chinese standard of train stability, the performance grade of train stability and vibration were proposed.
		2011 Vol. 32 (6): 647-651 [Abstract] ( 3338 ) [HTML 1KB] [ PDF 1909KB] ( 5933 )

	652	Control law of varied steering ratio based on driver-vehicle-road closed-loop system
		WEI Jianwei, WEI Minxiang, ZHAO Wanzhong
		An electric power steering (EPS) system with varied steering ratio was proposed, and mathematical model of varied steering ratio for EPS system was established. In view of the effects of the characteristic speed on vehicle stability, and the maneuverability requirements of steering wheel angle, two control strategies of varied steering ratio were proposed to obtain constant vehicle steering. The first control strategy was derived by segmented linear superposition of varied steering ratios from yaw rate and lateral acceleration. Based on the first strategy,the second control strategy was deduced by steering wheel angle correction. To verify the proposed two control strategies, driver-vehicle-road closed-loop system was established. Based on linear matrix inequalities, a robust PID controller of angular position tracking was designed for brushless DC motor. Simulation test of single lane change maneuver was carried out to compare the two control strategies according to steering wheel angle and path tracking performance.The simulation results indicate that the second control strategy has better integral performance than that of the first one.
		2011 Vol. 32 (6): 652-657 [Abstract] ( 1557 ) [HTML 1KB] [ PDF 1709KB] ( 1681 )

	658	Starting control for wet dual clutch transmission based on intelligent control
		WANG Yinshu, CHENG Xiusheng, FENG Wei, LI Xuesong
		In order to solve the starting control problems of vehicle equipped with wet dual clutch transmission, the starting strategy based on fuzzy control was proposed with regarding of driver intention, engine running state and clutch engaging state. The fuzzy controller was designed to solve the starting nonlinearities and uncertainties due to variation of vehicle characteristics, driving condition and driver intention. The wet clutch target pressure of starting phases was determined by the fuzzy controller. Based on fuzzy cerebellar model articulation controller (FCMAC) ,the clutch pressure intelligent control arithmetic was designed to realize accurate control of clutch pressure. The vehicle starting experiment was conducted to verify the control strategy. The results show that the clutch pressure control system ensures precise control of clutch pressure,and starting control strategy meets the requirements of smooth and rapid ride in starting process.The starting quality of vehicle is satisfying according to the proposed control strategy.
		2011 Vol. 32 (6): 658-662 [Abstract] ( 2436 ) [HTML 1KB] [ PDF 2136KB] ( 2164 )

	663	Applications of novel permanent maglev bearings in turbinemachines and heart pumps
		QIAN Kunxi, XU Zihao, WANG Hao, WANG Fangqun
		To verify the stable suspending of passive magnetic bearing rotor during rotating, a novel self-designed passive magnetic bearing was applied in turbine machine and centrifugal heart pump.The rotating eccentricity and speed of rotors were measured by Hall sensors and speed sensors, respectively. The results show that when the rotating speed is higher than a critical value of 1 800 r·min-1 for turbine machine and 3 250 r·min-1 for heart pump, the rotor eccentricities were obviously smaller than 0.15 mm of the gap between rotors and stators, which indicates that the rotors disaffiliate from stators with stable suspension. High speed rotating levitator with socalled ″Gyro-effect″ can make passive maglev rotator stable. In static state or in the case of rotating speed lower than the critical value, the passive maglev rotator can not keep rotation stable.When the rotating speed is higher than the critical value, the passive magnetic levitator will have Gyro-effect and obtain stable suspension with five degrees of freedom.
		2011 Vol. 32 (6): 663-666 [Abstract] ( 1788 ) [HTML 1KB] [ PDF 2307KB] ( 3109 )

	667	Coefficient of performance of solar heat pump water heater with energy storage
		WU Wei, WEI Liangyan, CHENG Qing, WANG Linglong
		To solve the problem that solar heat pump water heater was prone to be affected by weather, a novel water heater integrated with collection, storage and evaporation was proposed. The principle, characteristics, operating modes and structure of the collector-storage-evaporator system were investigated. Using phase change material of decanoic acid to store solar radiation in sunny days as low-temperature source, hot water was produced at night or in continuous rainy days. Thermal efficiency of heat pump system was increased significantly, and the operating unstableness of the heat pump system caused by interval solar energy was also solved. Experiments under different conditions and operating modes in spring were conducted, and the coefficient of performance (COP) of the system was analyzed. The results indicate that COP of this novel solar heat pump water heater with energy storage is higher than that of ordinary solar heat pump water heater at the same weather condition. The average COP of this system is 7.56 with maximum of 8.9 for average solar radiation of 592 W·m-2. COP can also reach 6.4 even at night,which means that weather has slight influence on COP.
		2011 Vol. 32 (6): 667-671 [Abstract] ( 1753 ) [HTML 1KB] [ PDF 1672KB] ( 2282 )

	672	Flow in diesel nozzle holes based on initial cavitation
		HE Zhixia, HUANG Yunlong, ZHONG Wenjun, XUAN Tiemin
		In order to investigate the flowing mechanism of cavitation in nozzle, a visualization test was designed to directly observe cavitation in nozzle holes. Mixed multiphase model, cavitation model and k-ε equation were used to simulate the twophase cavitation flow. The effects of injection pressure, bubble volume fraction in liquid, liquid viscosity, wall physical properties and surface tension on the cavitation flow in nozzle were investigated. The results show that the initial cavitation flow developed gradually to be super cavitation with the increasing of entrance pressure. When the cavitation parameter is lower than the critical cavitation parameter, the discharge coefficient increases with the increasing of cavitation parameter. However, on contrary condition, the change of discharge coefficient can be negative with no cavitation. The larger the bubble volume fraction in liquid is, the more obvious the cavitation is. With the increase of inlet pressure, the bubble volume fraction has more influence on cavitation with smaller critical cavitation pressure. The liquid viscosity has a certain restriction on cavitation development. Enhanced liquid viscosity needs high critical cavitation pressure. The wall physical properties and surface tension has slight impact on cavitation.
		2011 Vol. 32 (6): 672-677 [Abstract] ( 2018 ) [HTML 1KB] [ PDF 2167KB] ( 2404 )

	678	A kind of BiCMOS voltage to frequency converter using double closed-loop interlock and adjustment control technologies
		CHENG Li, YAN Ming, DING Ling, YANG Ning, WANG Zhenyu
		To solve the problems of narrow adjustment control range，large linearity error and high power consumption of current voltage to frequency converter(VFC)，a kind of 0.25 μm BiCMOS VFC was designed. Twostage low voltage cascode operational amplifier was adopted in voltage to current converter(VCC). Negative feedback was respectively introduced into VCC，charge and discharge circuit and voltage testing circuit，which formed two closedloop systems. BJT electronic switching cell and CMOS feedback gate circuit were linked to form interlock and the whole circuit consisted BiCMOS VFC with adjustment control. The simulation and hardware circuit experiments were carried out. The results show that the ideal linear range of output frequency is 0-60 MHz for a given input voltage range of 0-1.0 V, while the real linear range is 100 Hz-58.5 MHz with the linear error lower than 1%. The power consumption of 230 μW is a litter higher than the same kind CMOS VFC，but the performances of bandwidth，linearity and antijamming are greatly improved.The proposed VFC is suitable for low voltage and remote measurement systems with high precision control.
		2011 Vol. 32 (6): 678-682 [Abstract] ( 1538 ) [HTML 1KB] [ PDF 1660KB] ( 1765 )

	683	Design of control system software for bearingless permanent magnet synchronous motor based on modularization
		ZHU Huangqiu, FU Xiangdong, ZUO Wenquan, LV Yanbo , WEI Jinfu
		To control and debug the bearingless permanent magnet synchronous motor (BPMSM) conveniently, a modular digital control system software program was designed. Based on rotor suspension principle, the electromagnetic torque equation and radial suspension force equation of BPMSM were introduced. According to the functional block diagram of BPMSM control system, the modularization configuration of control system software and the realizing methods of its various parts were provided. The management mechanisms of two kinds of critical resource in DSP were proposed to ensure swiftness and stability of the control system. A digital control system experimental platform of BPMSM prototype was built to study the rotor suspension performance. The results show that all functions of BPMSM torque control, suspension control and humancomputer interaction can be implemented well by the modular software structure, implementing methods and management mechanisms. The software can meet the desires of BPMSM control.
		2011 Vol. 32 (6): 683-688 [Abstract] ( 1749 ) [HTML 1KB] [ PDF 1473KB] ( 1814 )

	689	Recognition method of road speed limit sign based on evolvable hardware
		WANG Jin, KANG Xiong
		In order to solve the limitations of traditional recognition methods with long time system learning and recognition, and poor readability of learning results, an evolvable hardware (EHW)based road speed limit sign recognition method was proposed. Through the processes of location and feature extraction for the four kinds of normal traffic signs, the preprocessed feature vectors were employed as training and test dataset. The EHWbased recognition system was designed by VHDL and realized on a Xilinx Virtex xcv2000E. In order to improve the system learning speed and recognition accuracy, an incremental evolution strategy and a statistical recognition method were introduced. The performance of the EHW recognition system was analyzed and compared for various experimental settings. The results show that under different outdoor environments the average recognition rate and the recognition time of the proposed evolvable system are 92.31% and 0.12 μs, respectively. The proposed scheme is an efficient tool for road limit sign recognition.
		2011 Vol. 32 (6): 689-694 [Abstract] ( 1771 ) [HTML 1KB] [ PDF 1916KB] ( 1864 )

	695	A robust watermarking scheme for 3D models based on vertex norm
		WANG Xinyu, ZHAN Yongzhao
		In order to extend attack resistance types of digital watermark in threedimensional models and improve the robustness against simplification, cropping and combination attacks, a new nonblind watermarking scheme based on vertex norm in spatial domain was proposed. During watermark embedding, the normalized vertex sets of 3D models were built, and the vertex norms in these vertex sets were modified to embed watermark by changing the proportion of vertices satisfying specified conditions. During watermark detecting, the number of vertices satisfying the given conditions in detected model and original model were counted respectively and compared to extract watermark. The existence of original watermark was verified by correlation test. The algorithm was implemented based on VC++, and experimental analysis on transparency and robustness were completed by bunny and horse model of Stanford. The results show that the watermark embedded by the scheme has enough imperceptibility, and is not affected by translation, rotation, uniform scaling and vertex reordering. The good robustness against noise, simplification, cropping, quantization, smoothing, subdivision and combination attacks is also achieved.
		2011 Vol. 32 (6): 695-700 [Abstract] ( 1314 ) [HTML 1KB] [ PDF 1424KB] ( 2120 )

	701	Clustering method based on elliptical contoured mixture model
		ZHU Feng, SONG Yuqing, CHEN Jianmei
		In order to appropriately select the distribution function as the component of the finite mixture model for clustering analysis, a clustering method based on the elliptical contoured mixture model was proposed by theory of generalized multivariate analysis. The finite mixture model was constructed by elliptical contoured distribution family, with similar properties to normal distribution. The label variable was introduced to transform clustering into parameter estimation. The common variable parameters of the model were estimated according to the maximum likelihood and EM algorithm. The function variable parameter was estimated by kernel density estimation theory to obtain iterative update formulas of E and M steps. The elements were classified by the maximum posteriori probability rule. The experiments of different level noise data simulated by uniform distribution show that the proposed method displays good effectiveness and adaptability for non normal data.
		2011 Vol. 32 (6): 701-705 [Abstract] ( 2318 ) [HTML 1KB] [ PDF 1526KB] ( 2235 )

	706	Twoway relay selection strategy combined with beamforming
		ZHAO Rui
		To enhance transmission performance of multi-antenna source and multiple single-antenna two-way relay communication systems with decreased signal processing complexity, an optimal relay selection combined with beamforming scheme was proposed. The relay selection was performed by only local channel state information in a distributed way, and the transmitting and receiving beamforming vectors were realized according to two sources by maximum-ratiotransmission (MRT) and maximum-ratio-combining (MRC) rules. Based on the channel statistical property, the outage probability performance of the new scheme was analyzed in Rayleigh fading channels to deduce the closed expression of the system outage probability. The new scheme was simulated to compare with other five schemes. The results show that outage probability of the new transmission scheme is obviously better than those based on the path, sum rate, symbol error ratio, opportunistic single relay selection and equalpower multiple relays transmission. The system outage probability of the new scheme is improved with the increase of relay and antenna number, since the multirelay and multiantenna diversities can be fully utilized.
		2011 Vol. 32 (6): 706-709 [Abstract] ( 1294 ) [HTML 1KB] [ PDF 1583KB] ( 1619 )

	710	Numerical simulation on thermal fatigue stress field of directionally solidified Al-Cu alloy
		LIU Hai-Xia, SI Songhai, SI Naichao, YUAN Tingting
		The thermal fatigue stress field of directionally solidified Al-Cu alloy with Cu mass fraction of 4.5%) was investigated with commercial finite element method(FEM) software ANSYS. Changing rules of thermal stress field were obtained under thermal cycling condition. In one thermal cycle,thermal stress expands into the sample by the form of small triangle,and with later quick extending by the form of master stroke. The change of thermal stress becomes slow finally. After one cycle, there is residual stress in the sample. With the increasing of cycle extent, residual stress cumulates gradually. Thermal fatigue cracks appear when residual stress reaches a certain extent. Furthermore, simulating results were compared with experimental results of thermal fatigue crack initiation and propagation in alloy samples. The results validate the reliability of the adopted FEM.
		2011 Vol. 32 (6): 710-714 [Abstract] ( 1767 ) [HTML 1KB] [ PDF 2145KB] ( 1899 )

	715	Enhancing signals in luminescent photoelastic coating method
		HUA Shiqun, LUO Ying, LU Daoli, WU Changlong
		In order to solve the shortcoming of relatively low signal-to-noise ratio of coating configurations (dual-layer coating and single-layer coating) in luminescent photoelastic coating method for experimental strain analysis, a new luminescent photoelastic coating configuration was introduced.Two luminescent photoelastic coatings with different configurations were prepared with identical luminescent dyes of Rhodamine B, photoelastic materials of E-44 Epoxy resin, plasticizers of Dibutyl phthalate and curing agents of Diethylenetriamine. Fluorescence emission spectra of the two luminescent photoelastic coatings were measured by Cary-100 fluorescence spectrophotometer with excitation wavelength of 465 nm. The intensity of the new single-layer luminescent coating at emission wavelength of 600 nm is 3.7 times stronger than that of the original dual-layer luminescent photoelastic coatings. Theoretical analysis and experimental results show that the new luminescent photoelastic coating configuration can remarkably improve signal-to-noise ratio and increase fluorescence emission intensity.
		2011 Vol. 32 (6): 715-719 [Abstract] ( 1274 ) [HTML 1KB] [ PDF 1724KB] ( 2031 )

	720	Al2O3-TiO2ceramic coating prepared by laser cladding on Nickel-base superalloy
		GAO Xuesong, TIAN Zongjun, HUANG Yinhui, LIU Zhidong, SHEN Lida
		Al2O3-TiO2 coatings were prepared by laser cladding on nickel-based alloy with the assistance of other different technologies. The result shows that there are a lot of cracks and flake phenomenon with the coating by laser cladding, while the whole ceramic coating prepared by laser cladding spalled from substrate preheated. The excellent performance of ceramic coating was achieved by laser cladding with the assistance of high frequency induction sources and isostatic pressing(CIP) technology. Microstructures of the laser sintered samples were characterized by scanning electron microscope（SEM). The surface of Al2O3-TiO2 ceramic has high compactness and strong bonding strength with no obvious cracks and porous in the interface between ceramic coating and bond coating. According to experiment results, it can be deduced that the increasing of ceramic powders density and the decreasing of temperature gradient in laser cladding process can improve ceramic formability obviously.
		2011 Vol. 32 (6): 720-723 [Abstract] ( 1876 ) [HTML 1KB] [ PDF 1730KB] ( 1942 )

	724	Effect of GTA-ultrasonic excitated-voltage on microstructure and impact toughness of CLAMs weldments
		CHEN Xizhang, SHEN Zheng, CHEN Jin, LEI Yucheng, HUANG Qunying
		The GTA-ultrasonic, which was stimulated by modulation of ultrasonic excitation to the gas tungsten arc welding（GTAW) source power, was used to weld China Low Activation Martensitic steel（CLAMs) by coupling interaction between arc and workpiece. According to previous experiences, welding current, proper excitated voltage and their combination were selected. The experimental results,comparison analysis show that the microstructure and the mechanical properties of CLAMs weld are ame-liorated remarkably by GTA-ultrasonic. By appropriate combination of GTA-ultrasonic parameters, martensite laths bundle of joints become dense with fine distribution of precipitated carbides. The impact toughness of weld joint is improved markedly with maximum of 80%. Under the combined effect of ar-cultrasonic and heat input, the impact toughness of weld joint increase a trend first and then decrease with the increasing of excitatedvoltage. By controlling the quantity of welding heat input, high impact toughness can be achieved by appropriate enhancement of excitated-voltage.
		2011 Vol. 32 (6): 724-727 [Abstract] ( 1561 ) [HTML 1KB] [ PDF 3503KB] ( 1813 )

	728	Elastic-plastic fracture assessment for high-rank pipeline steel with semi-elliptical crack
		WANG Zhongxian, ZHANG Ruifeng
		The elasticplastic fracture J-A2 method was performed to study the semielliptical surface crack and the single edge through thickness crack tension specimens of X80 and X100 steels. By 3D and 2D finite element analysis, the fracture driving forces of Jintegral and the constraint parameters, A2 of semielliptical surface crack were calculated same length and different depths for X80 and X100. According to J-A2 failure curves of the two steels, the fracture analysis and comparison were conducted between the elliptical cracks and the corresponding single edge cracked tension specimens. The results show that the elliptical crack depth mainly affects the J-integral value with slight influence on cracktip constraint level. The constraint situation of the deepest point of semi-elliptical crack and the cracktip of the single edge cracked tension specimen is quite different when their crack depth and J-integral are same. Constraint level on the cracktip of the single edge cracked tensile specimen is higher than that of semi-elliptical crack in middle and large scale yielding. The failure assessment for X80 and X100 pipeline steel with deep semi-elliptical crack by the calculation of plane model is conservative, but the situation is the opposite for X100 steel with shallow crack.
		2011 Vol. 32 (6): 728-731 [Abstract] ( 1394 ) [HTML 1KB] [ PDF 2044KB] ( 1977 )

	732	Structural system reliability evaluation of long-span cable-stayed bridges
		LIU Xiaoluan
		Combining the advantages of response surface method(RSM), finite element method (FEM), β-unzipping method and product of conditional marginal method(PCM), an approximate method was proposed to rapidly evaluate the reliability of bridge structure system. The component reliability indices were calculated by FEM and RSM, while the β-unzipping method and PCM method were employed to calculate critical failure modes and system failure probability. The structure system reliability of cable-stayed Sutong Bridge with a main span length of 1 088 m was conducted by the proposed approximate method. The obtained results clearly show the applicability and merits of the proposed method in the identification of critical failures modes, and the reliability indices for hybrid system are slightly larger than those for series system. The proposed method provides convenience for the system reliability evaluation of other bridge structures.
		2011 Vol. 32 (6): 732-735 [Abstract] ( 1359 ) [HTML 1KB] [ PDF 1782KB] ( 1733 )

	736	Seismic experience evaluation method optimization and evaluation system establishment about Chinese ancient wooden structures
		LIU Ronggui, ZHANG Chi, LI Lin
		Based on the rich seismic evaluation experiences of cultural relics protection units in Wuhan of China, the origins of the principles and contents in original seismic evaluation approach of Chinese ancient wooden structures were analyzed. According to referent seismic resistance criteria, newest research results and seismic damage examples, two new ways were proposed based on the newest seismic evaluation demands. The evaluation contents and evaluation tables were improved to specify and quantify the original evaluation contents.According to the proposed method,the person who conducts evaluation work can realize the key point and basis of real investigation and evaluation project. The peak accelerations and the seismic coefficient characteristic values were calculated to achieve the limit values for different earthquake damage ranges under seismic resistance requirements of three standards in divided zones. Therefore, a new evaluation system was set up. Based on the plan picture of dynamic coefficients in divided zones of Wuhan, earthquake damages of ancient wooden structures were predicted by the proposed evaluation method and evaluation system to obtain the earthquake damage evaluation results.
		2011 Vol. 32 (6): 736-740 [Abstract] ( 1348 ) [HTML 1KB] [ PDF 1365KB] ( 1629 )

	741	Projective synchronization in a time-delayed drive-response complex dynamical network with different scale factors
		BIAN Qiuxiang, YAO Hongxing
		The projective synchronization of time-delayed drive-response dynamical network was investigated.The nodes did not need to be partially linear, and the scale factors might be different from each other. The scale factors were discussed under limited and unlimited conditions. Based on the Lyapunov stability theorem and impulsive control method, some projective synchronization rules of drive-response dynamical network with different scale factors were proposed.The synchronization was realized without any extra controller under limited conditions, while under unlimited conditions,it just needed a simple control to every node. The drive-response network was simulated through time-delayed Hopfield neural network as nodes dynamics. The validity of these synchronization criteria is proved by theoretical analysis and numerical simulation results.
		2011 Vol. 32 (6): 741-744 [Abstract] ( 1137 ) [HTML 1KB] [ PDF 1471KB] ( 1474 )

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