Journal of Jiangsu University(Natural Science Eidtion)

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Journal of Jiangsu University(Natural Science Eidtion)

	2015 Vol.36 Issue.3 Published 2015-05-10

	Article

Article

	249	Adaptation for vehicle of Eruca-Sativa-Gars biodiesel based on bed-test
		Tian Jingjing1, Li Shiwu2, Dong Shengwu3
		The Eruca-Sativa-Gars (ESG) biodiesel was produced by the transesterification reaction between ESG and methyl alcohol with sodium carbonate as catalyst. The physical and chemical properties including density, viscosity, distillation range, cetane number and flash point of ESG biodiesel were compared with those of 0# diesel. The bed-test was conducted to analyze the emission performance of ESG biodiesel with different mixing ratios. The results of tests show that the ESG biodiesel can meet the fuel demands perfectly. The emission performance of ESG biodiesel is better than that of 0# with slightly higher diesel fuel consumption. The B50 biodiesel can substitute 0# diesel and modify the emission performance of engine.
		2015 Vol. 36 (3): 249-254 [Abstract] ( 860 ) [HTML 1KB] [ PDF 2168KB] ( 1317 )

	255	Performance effect of carbon fiber reinforcement on tread rubber of engineering vehicle retreaded tire
		Wang Qiang， Qi Yingjie
		In order to effectively solve the problems of chunking, chip off-falling, easily being punctured and worn, and further improve service life of engineering vehicle retreaded tire, the engineering retreaded tire tread rubber was used as matrix with carbon fiber as reinforcement. The bonding property of interface between carbon fiber and tread was observed and analyzed by electronic microscope，and the effects of bonding body and mixing smelting technique on tread rubber bonding performance were also inspected. The effect laws of carbon fiber material with different length and quality percentage on performance of engineering vehicle retreaded tire tread were achieved through performance comparing of stretching strength, tearing strength, elasticity modulus, maximum elongation, rebound resilience, hardness and wearing index. The test results show that the reinforcement effect on engineering retreaded tread rubber is optimum with carbon fiber length of about 6 mm and quality percentage of about 7%. The main physical and mechanical performance indexes are good, and the service life of engineering vehicle retreaded tire is greatly improved.
		2015 Vol. 36 (3): 255-259 [Abstract] ( 1252 ) [HTML 1KB] [ PDF 1748KB] ( 1208 )

	260	Sliding mode-PID control of driving system for motorized wheels vehicle
		Duan Tingting1, Wang Chunyan1, Zhao Wanzhong1, Zhang Yuwen2
		In order to improve response time and response stability of the driving system of motorized wheels vehicle, the simplified vehicle dynamic models of in-wheel motors and the PM BLDC driving modles were built. Based on sliding mode theory and PID control method, the outer-loop sliding mode-PID controller and the inner-loop PID tracking controller were designed respectively according to dynamic quality of motorized wheels vehicle driving system and characteristic requirements of dynamic and static performance of sliding mode. Using the double loop control strategy to take the advantages of sliding mode control and PID control, the control quality of driving system was improved. The simulation results show that the designed driving system can rapidly control the vehicle driving system and in-wheel motors and improve the characteristics of vehicle dynamics and in-wheel motors.
		2015 Vol. 36 (3): 260-264 [Abstract] ( 1202 ) [HTML 1KB] [ PDF 1442KB] ( 1494 )

	265	Effects of nano-particles on volatilization and oxidation characteristics of diesel fuel
		Yuan Yinnan1, Ji Chen2, Mei Deqing2, Jiang Shiyang2, Wu Han2
		Under nitrogen and air atmospheres of thermo-gravity, the volatilization and oxidation characteristics of several fuel blends of diesel and nano-materials with Al2O3 particle average size of 20， 50 nm and CeO2 particle average size of 20 nm were investigated for adding concentration of 50, 100 and 150 mg?L-1. The impacts of nano-particle concentration, size and material on volatilization and oxidation process of nano-diesel were explored by control variable method. The results show that the volatilization process under nitrogen atmosphere is slowed down by nano-particles. Higher nano-particle concentration and bigger particle size can decrease the volatilization of nano-diesel. Under oxidation atmosphere, nano-particles can speed up the oxidation process. The diesel fuel oxidation is accelerated more obviously with higher nano-particle concentration and smaller size. Al2O3 particles with average size of 20 nm show more active effect on diesel oxidation than that of CeO2 particles with the same size because of the cataly-tic function.
		2015 Vol. 36 (3): 265-270 [Abstract] ( 1546 ) [HTML 1KB] [ PDF 1732KB] ( 1958 )

	271	Effect of structural parameters on film thickness at centrifugal nozzle outlet
		Qiu Qinggang, Jia Dandan, Zhu Xiaojing, Yin Xiaoqi, Shen Shengqiang
		VOF method was employed with realizable k-ε turbulence model to predict the influence of structure parameters on liquid film thickness at the outlet of centrifugal nozzle. The numerical result was compared with experimental data to verify the model reliability. The numerical simulation results show that the film is formed into a ring with an air cone in central axis. The liquid membrane is decreased with the increasing of air cone radius, and the length of film broken is shortened by improving flow rate. The bigger the diffusion angle is, the thinner the liquid film is with the shorter of the length of film broken. The bigger the nozzle diameter is, the longer the length of film broken is with unsteady film thickness, and the size of film thickness is floating. The longer the straight of nozzle exit is, the shorter the length of film broken is, while the effect of exit straight length is slight.
		2015 Vol. 36 (3): 271-275 [Abstract] ( 1256 ) [HTML 1KB] [ PDF 1634KB] ( 1453 )

	276	Fluidization characteristics of medium consistency pulp
		Ye Daoxing, Li Hong, Zou Chenhai, Liu Zhenchao
		In order to investigate the medium consistency pulp flow behaviors under different shear stress, the experimental rig was established to obtain the fluidization characteristics and achieve pumping purpose. The pulp shear stress was analyzed to measure the density, shear stress and impeller speed of medium consistency pulp. The relationship between shear stress and rotation speed was investigated to establish a mathematical model. According to the model and test analysis, the fluidization characteristics of different mass consistency pulp were discussed to obtain apparent yield stress and critical shear stress. The relationship among apparent yield stress, critical stress and pulp consistency was analyzed. The results show that the power number increases with the increasing of consistency and decreases with the increasing of rotational speed. When the power number approaches to a minor stable value, the medium consistency pulp is in fluidization.
		2015 Vol. 36 (3): 276-280 [Abstract] ( 882 ) [HTML 1KB] [ PDF 1681KB] ( 1396 )

	281	Value of nozzle falloff angle of jet pump
		Lü Zhongbin, Wang Yang, Liu Jieqiong, Cao Puyu, Li Guidong
		In order to obtain the influence of nozzle falloff angle on jet pump, the jet pump of XDPm255A from a company in Zhejiang was investigated based on the combination of numerical calculation and experimental research. According to numerical results of Fluent, the influence of nozzle falloff angle on internal flow field and external characteristic of jet pump in different area ratio was analyzed. By data fitting, the fitting trendline of nozzle falloff angles in high efficiency area with area ratio from 2.01 to 5.06 was realized and verified by experiments. The results show that when the area ratio of jet pump is constant, there is an optimal flow ratio to obtain the maximum efficiency of jet pump for each nozzle angle. As the area ratio increases, the optimal flow ratio increases. The reliability of the fitting trendline of nozzle falloff angles in high efficiency area was validated by test results.
		2015 Vol. 36 (3): 281-287 [Abstract] ( 1363 ) [HTML 1KB] [ PDF 1966KB] ( 1314 )

	288	Correlation experiment between molding process of annular mould briquetting machine and calorific value of rice straw briquette
		Chen Shuren1, Jiang Chengchong1, Yao Yong2, Yin Jianjun1, Jiang Xiaoxia1
		Based on the compression molding process of annular mould briquetting machine of 9JYK-2000A,scheme design and result analysis of the optimal experiment were realized for calorific value of rice straw briquetting.The quadratic orthogonal rotation combination experiment was designed with spindle speed, molding temperature and moisture content as influence factors, and the low calorific value of rice straw briquette press was used as test index. According to the experimental results, the quantitative mo-del was established to analyze the relationship between forming factors of annular mould briquetting machine and low calorific value of rice straw briquette.The model was verified by experiment with error range less than 5% to show that the quantitative model could be used for subsequent optimization.Combined with regression analysis method and response surface analysis in the software of Design-Expert 8.0.6,the data was analyzed and optimized.The experimental results show that the influencing sequence of forming factors of annular mould briquetting machine on the low calorific value of rice straw briquetting is followed by spindle speed， molding temperature and moisture content. The optimal indicators for for-ming process are obtained with spindle speed of 175 r?min-1, temperature of 138 ℃and moisture content of 14.33% to achieve the best low calorific value of 11 711 kJ.
		2015 Vol. 36 (3): 288-294 [Abstract] ( 800 ) [HTML 1KB] [ PDF 2152KB] ( 1212 )

	295	Visual spatial orientation of oscillating orange
		Ning Zhigang, Cheng Xiong, Cheng Hui, Yang Heng
		The spatial orientation method of oscillating orange was investigated.The under-damped oscillation model was used to denote orange oscillation process. FFT spectrum analysis method was used to determine the oscillation period of oscillating orange, and Fourier curve fitting method was used to determine the centroid coordinates of equilibrium point.The three-dimensional coordinates of equili-brium point were determined based on the centroid coordinates of left orange image and corresponding right orange image.According to oscillation period and three-dimensional spatial coordinates of equili-brium point, the spending time of each phase and the movement velocity were determined. The experimental results show that the algorithm can well satisfy the requirements of spatial orientation of oscillating orange.
		2015 Vol. 36 (3): 295-300 [Abstract] ( 954 ) [HTML 1KB] [ PDF 1696KB] ( 1068 )

	301	Static error analysis of 7-DOF exoskeleton upper limb rehabilitation robot
		Yang Qizhi1,2, Wang Zhihuan3, Song Junpeng3, Zhao Jinhai3, Guo Linqiang3
		Static error analysis plays a significant role on design, manufacturing and assembly of 7-DOF exoskeleton upper limb rehabilitation robot. The result of static error analysis usually affects the choice of measurement and optimization. The end movement of 7-DOF exoskeleton upper limb rehabilitation robot was investigated. The expression of terminal position and orientation error was obtained by theoretical calculation, and control variate method was applied to investigate the influences of length error and angle error. The terminal position and orientation error curve was drawn by MATLAB. The comparison analysis shows that angle error has more enormous impact than that of length error on terminal position and orientation accuracy. The angle accuracy should be pledged as high as possible for reducing processing cost and lessening risk of secondary injury.
		2015 Vol. 36 (3): 301-305 [Abstract] ( 1018 ) [HTML 1KB] [ PDF 1880KB] ( 1479 )

	306	Kinematical simulation analysis of front lay location to iron sheet of iron printing machine
		Guo Nianqin, Liu Daming
		To solve the edge defect of iron sheet due to instant iron collision during the positioning contact of iron printing machine, the kinematics analysis of front lay was carried out with gauge baffle as follower.The front lay was transformed into hinge four-bar mechanism and CAM-swinging rod mechanism to set up the kinematics equation among components.3D simulation software of solidworks motion was used to analysis the kinematical simulation of front lay location to iron sheet.The motion regularity comparison of 8 front lays and iron sheets was conducted to achieve an optimum kinematical combination of iron sheet and front lay.The simulation results show that the minimum contact force is realized with the most mild striking for the optimum regularity of iron sheet.
		2015 Vol. 36 (3): 306-311 [Abstract] ( 934 ) [HTML 1KB] [ PDF 2781KB] ( 1280 )

	312	Low-level temporal segmentation of motion capture data based on weighted confidence
		Yang Yang, Zhan Yongzhao, Wang Xinyu
		To solve the problem that traditional low-level temporal segmentation methods could hardly work out a suitable segmentation for motion capture data with high dimensionality, a low-level temporal segmentation algorithm was proposed based on weighted confidence. The confidence as segment boundary of each time point was calculated in each dimension, and the confidence values of different dimensions were incorporated by zero-crossing strength. The whole body segment boundaries were derived by pruning the local maximum and determined by an optimum empirical threshold. The optimum threshold was obtained by testing several sets of data. The experiments were completed based on the data from motion capture database of Carnegie Mellon University. The results show that the proposed method is effective for segment motion capture data, and under the optimum threshold condition, the method is far better than the method based on curvature or whole body rate.
		2015 Vol. 36 (3): 312-318 [Abstract] ( 977 ) [HTML 1KB] [ PDF 1860KB] ( 1212 )

	319	Point cloud registration algorithm based on free-form surface
		Lu Zhangping, Zheng Hang, Sha Chunfa, Li Mingzhu
		To improve the registration efficiency of free-form surface work piece, according to RANSAC preliminary registration algorithm, a new two-step registration method of free-form surface was proposed based on coplanar 4-point sets algorithm and improved iterative closest point(ICP) exact registration algorithm. The coplanar 4-point sets were searched through the distance and proportional relationship among points based on RANSAC. The invariants of coplanar 4-point sets were used to constraint the sample extracted by RANSAC algorithm, and the point cloud was marked to get a good initial position after preliminary registration. The method was improved based on original ICP algorithm to optimize the result of preliminary registration. The registration error was minimized to realize the exact registration. The registration simulation of CAD surface cloud models of two simple work pieces was completed. The results show that compared to traditional ICP algorithm, the running time of the proposed algorithm was reduced by 48% with increased accuracy by 56%.
		2015 Vol. 36 (3): 319-323 [Abstract] ( 989 ) [HTML 1KB] [ PDF 2178KB] ( 1319 )

	324	New network stream watermarking scheme based on interval changing slots
		Yan Shenghua1,2, Zhou Lianying1
		In order to solve the changing contents and the simple grouping of packet in current watermarking technologies, a new watermarking scheme was proposed based on theoretical analysis and calculation. The packet delay was modulated subtly in the interval-based changing slot network stream watermarking scheme. The code division multiplexing was used to extend the watermark information and improve the error correction ability. To test and verify the performance of new technology, various network environments were simulated to complete many tests, and the detection rates were calculated by two ways. The experimental results show that the detection rate of new scheme is increased by 28% than the original group packet when the jitter average is more than 6 ms. When the jitter average is less than 10 ms, the mean detection error rate of new technology is less than 0.49, while the rate of original way is more than 0.5. The comparison shows that the new technology can improve the detection rate clearly with high performance.
		2015 Vol. 36 (3): 324-330 [Abstract] ( 1103 ) [HTML 1KB] [ PDF 1728KB] ( 1968 )

	331	Robust vehicle recognition algorithm using visual saliency and deep convolutional neural networks
		Cai Yingfeng1, Wang Hai2, Chen Long1, Jiang Haobin2
		To solve the problem that the traditional manual feature based machine learning algorithms were unable to satisfy robust vehicle recognition requirement in complex traffic environment, a vehicle candidate extraction method was proposed based on visual saliency theory. In the framework of deep learning, a robust vehicle recognition algorithm was also proposed based on deep convolutional neural networks (DCNN). The DCNN was constructed with two hidden layers of filtering layer and pooling layer. The raw pixels of gray images were set as input and trained by stochastic gradient descent algorithm. The whole networks were output by a fully connected layer. The KITTI library was chosen as test database to complete the vehicle recognition experiments. The results show that the overall detection rate of the proposed method reaches 98.13% with false detection rate of 1.77%, which is better than that of existed vehicle recognition methods.
		2015 Vol. 36 (3): 331-336 [Abstract] ( 1465 ) [HTML 1KB] [ PDF 1752KB] ( 2579 )

	337	Design and experiment of a fully compliant capacitive tactile sensor
		Xu Decheng1, Gao Yonghui1, Guo Xiaohui2
		To realize normal force and shear force perception, a fully compliant capacitive tactile sensor was designed for bio-inspired skin sensor array. The pressure-sensitive unit was constructed with silicone rubber as flexible substrate and silver conductive adhesive as flexible parallel-plate capacitor. The wor-king principle and the structure design of capacitive flexible tactile sensor were introduced. The sensing information acquisition and processing system was also designed and implemented. When the normal load measurement ranges from 0 to 5 N with shear load measurement ranging from 0 to 3 N, the measured sensitivities are 6.78 fF/N and 11.45 fF/N, respectively. The experiment results indicate that the flexible capacitive sensors array and the capacitive signal extraction system have good stability and sensitivity for artificial skin to achieve tactile perception.
		2015 Vol. 36 (3): 337-342 [Abstract] ( 1320 ) [HTML 1KB] [ PDF 2958KB] ( 1957 )

	343	Noval magnetic nanoparticles for trypsin immobilization
		Sun Jun, Weng Longmei, Liu Meng, Hu Kunya
		The trypsin was successfully immobilized on the surface of magnetic carboxymethyl chitosan (Fe3O4 (PEG+CM-CTS)) nanoparticles by electrostatic interaction. The effects of the medium pH, the concentration of trypsin and the immobilization time on trypsin loading and relative activity onto the magnetic nanoparticles were discussed. The results show that the adsorption equilibrium of trypsin onto the Fe3O4 (PEG+CM-CTS) magnetic nanoparticles well fits Langmuir model, and the maximum trypsin loading is 117.6 mg?g-1 with relative trypsin activity of 87.9 %. The stability experiments indicate that the immobilized trypsin has good operational stability for the continuous hydrolysis of BSA solution with improved storage stability.
		2015 Vol. 36 (3): 343-347 [Abstract] ( 1836 ) [HTML 1KB] [ PDF 1556KB] ( 1012 )

	348	Preparation and visible-light-induced photocatalytic activity of graphene／CeO2 composites
		Yang Juan, Li Dan, Ma Shuangbiao, Zhou Yazhou
		The graphene／CeO2 composites were prepared by hydrothermal method at different temperatures. The sample structures were analyzed by XRD, SEM, TEM, TG and UV-vis spectrometer, and the photocatalytic activity of the samples was evaluated by degradation of methylene orange dye under visible light. The results indicate that grapheme／CeO2 composite with high loading percentage and relatively small particle size of about 20 nm can be prepared at 140 ℃. The obtained photocatalyst shows excellent photocatalytic activity under visible light, which is mainly attributed to the enhanced optical absorption in the visible region and the improved separation ability of photogenerated charges.
		2015 Vol. 36 (3): 348-352 [Abstract] ( 1203 ) [HTML 1KB] [ PDF 7102KB] ( 1702 )

	353	Analysis of grey incidence between limestone mineral composition and polishing value of aggregate
		Wang Yi1, Yue Guanghua1, Li Wei2
		The influence of limestone mineral composition on polishing value of aggregate was investigated. According to the test data of limestone mineral composition and polishing value of aggregate, the effects of limestone mineral composition on polishing value of calcite, quartz, dolomite and mica were analyzed by grey incidence analysis to rank mineral compositions by gray relational degree. The results show that the correlation degree between limestone calcite content and polishing value of aggregate reaches 0.975, and the correlation degree between limestone quartz content and polishing value of aggregate is 0.781. The contents of calcite and quartz have large influence on the polishing value of aggregate. With the decreasing of calcite content and the increasing of quartz content, the polishing value of aggregate is increased. The results show that cherty limestone with good mechanical property can be used as raw material of anti-skidding surface in expressway.
		2015 Vol. 36 (3): 353-356 [Abstract] ( 908 ) [HTML 1KB] [ PDF 1290KB] ( 1354 )

	357	Theoretical analysis method for unreinforced concrete column with bistable FRP confinement
		Zhang Xueyi1, Li Yang1,2
		In order to improve the ductility of fiber reinforced polymer (FRP) composites, a 2-step simulation method was proposed to numerically simulate the theoretical bistable stress-strain behavior. Finite element models of the bistable FRP wrapping layer and the entire bistable FRP confined column were analyzed respectively, and the theoretical bistable stress-strain curve was compared with the experiment results. A new stress-strain model for bistable confined concrete was proposed after a serial of parameter analyses. According to the verification, it is concluded that the proposed model is very accurate and stable to predict the entire stress-strain behavior of bistable confined concrete.
		2015 Vol. 36 (3): 357-361 [Abstract] ( 938 ) [HTML 1KB] [ PDF 1903KB] ( 1263 )

	362	Experiments of electro-thermal behavior for carbon black-carbon fiber concrete and carbon black concrete
		Wu Xian1, Cui Yuxi1, Hui Guochen2, Ma Yiying1, Zhang Bowen1
		To investigate the electrical conductivity and the electric heating effect of carbon black conductive concrete and carbon fiber-carbon black diphasic conductive concrete，the two concrete specimens were respectively connected into direct current circuit to observe the temperature and heat generated by electricity charging. The heating effect and the electrical resistivity of the two kinds of conductive concrete were compared and discussed. The results show that carbon fiber-carbon black diphasic conductive concrete has better electrical conductivity than carbon black concrete. The concrete specimen with 1% carbon black and 2% carbon fiber possesses the electrical resistivity less than 100 Ω?cm. The rates of temperature rising of both kinds of conductive concrete are stable with good heating effects. The electrical resistivity of carbon black concrete is stable in conduction, while the electrical resistivity of carbon fiber-carbon black diphasic conductive concrete is increased with the increasing of conduction time.
		2015 Vol. 36 (3): 362-367 [Abstract] ( 1067 ) [HTML 1KB] [ PDF 1680KB] ( 1242 )

	368	Magnetic field coupled with photocatalytic degradation of methylene blue in waste water
		Wu Chundu1,2, Zheng Kun1, Xie Qingjie1， Bai Ge3
		The photocatalytic degradation of methylene blue in waste water was investigated by new composite magnetic photocatalyst of magnetic field coupled with photocatalytic reaction test system. The in-fluence factors of magnetic field strength, rotating speed, reaction time and dosage of photocatalyst on the rotating magnetic field coupled with photocatalytic degradation were investigated. The results show that rotating magnetic field can significantly enhance photocatalytic degradation of methylene blue. Under the reaction conditions with magnetic field strength of 50 mT, rotating speed of 70 r?min-1, photocatalyst dosage of 1.2 g?L-1 for 120 min and initial concentration of 10 mg?L-1, the methylene blue solution degradation rate reaches 93.02%. UV-vis spectra comparison of methylene blue solution before and after reaction indicates that azo bond and benzene ring disappear after rotating magnetic field coupled with photocatalytic reaction. The results show that most of methylene blue is effectively degraded.
		2015 Vol. 36 (3): 368-372 [Abstract] ( 1472 ) [HTML 1KB] [ PDF 1672KB] ( 1151 )

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