Journal of Jiangsu University(Natural Science Eidtion)

[an error occurred while processing this directive]

Journal of Jiangsu University(Natural Science Eidtion)

Home | About Journal | Editorial Board | Subscriptions | Instruction | Contacts Us | 中文

　

Office Online

　

　

　

　

　

　

Editor-in-chief

　

Journal Online

　

　

Forthcoming Articles

　

　

　

　

　

Download Articles

　

　

Quick Search

Advanced Search

Journal of Jiangsu University(Natural Science Eidtion)

	2010 Vol.31 Issue.2 Published 2010-03-10

	Article

Article

	131	*Dynamics on pelvis for a 1R2T wire-driven parallel robot*
		Wang Keyi, Zhang Lixun, Zhang Jinyu, Liu Fuqiang
		By using the influence coefficients method,the kinematics of the 1R2T wire-driven pelvic rehabilitation robot was analyzed.The relationship of mapping between the motion of pelvis and wire was obtained.Matlab was used to simulate the pelvic expected trajectory in walking,and the variation curves for each wire′s acceleration were obtained.Based on spiral force balance equation of robot and by using Newton-Euler method and D′Alembert′s principle,the dynamic equations were established.By using simulation method,characteristics of robot′s inverse dynamics were analyzed.It is concluded that the set of the threshold of the minimum tensile force actually has influence on regularity for change of each wire′s tensile force.By using Matlab and Adams,the kinetic model of robot was established,the simulation was carried out for the case of whether considering rope stiffness or not.The relevant model is proved to be correct,and the regularity for change of kinematic performance influenced by both minimum threshold and cable stiffness is obtained.
		2010 Vol. 31 (2): 131-135 [Abstract] ( 1712 ) [HTML 1KB] [ PDF 0KB] ( 617 )

	136	*Effects of laser shock processing on mechanical properties of elastic alloy 3J58*
		Luo Kaiyu, Kang Zhengyang, Zhong Junwei, Yang Chaojun, Cheng Guanggui
		The samples manufactured by the elastic alloy 3J58 were tested by laser shock waves,and the nano-indentation experiments were made by Triboindenter in Hystron Company,and residual stresses were determined by using XRD with sin2 ψ method.The results show that surface residual stress distributions,nano-hardness and elastic modulus in the shocked region and the laser-affected region are clearly improved,which contributes to an increase in the surface properties in the near surface of the samples manufactured by the elastic alloy 3J58.
		2010 Vol. 31 (2): 136-138 [Abstract] ( 1794 ) [HTML 1KB] [ PDF 0KB] ( 675 )

	139	*Determination of characteristic aroma compounds of Zhenjiang fragrance vinegar using HS-SPME/GC-MS/GC-O*
		Sun Zongbao, Zhao Jiewen, Zou Xiaobo, Li Guodong
		Volatile components of Zhenjiang fragrance vinegar were extracted by using head space solid-phase microextraction（HS-SPME）.The major flavor compounds were identified by gas chromatography and mass spectrometry（GC-MS）,gas chromatography-olfactometry（GC-O） and retention index（RI）.Sixteen characteristic aroma compounds of Zhenjiang fragrance vinegar were determined by GC-O based on detection frequency and intensity as：3-methyl butanoic acid,3-methylbutyl acetate,acetic acid,phenylethyl acetate,ethyl acetate,phenylethyl alcohol,2,3-butanedione,dihydro-5-pentyl-2（3H）-furanone,2-methyl propanal,3-methyl butanal,benzaldehyde,trimethyl oxazole,furfural,2,3-dimethyl pyrazine,trimethyl pyrazine,and tetramethyl pyrazine
		2010 Vol. 31 (2): 139-144 [Abstract] ( 1702 ) [HTML 1KB] [ PDF 0KB] ( 665 )

	145	*Starting control of wet double clutch transmission*
		Cheng Xiusheng, Feng Wei, Lu Zhonghua, Liu Xi, Gu Qiang
		To solve the problems of poor smoothness and big frictional work in starting control of dual clutch transmission equipped with wet clutch,and according to structural characteristics of DCT,the starting control strategies of two gears working together in starting process were developed and the control flow chart of DCT starting was given.The precise control of clutch pressure was obtained by using clutch pressure control based on fuzzy PID control.The control strategies were verified through the starting test of three different throttles and consecutive start-stop in a short time.The experimental results show that the clutch pressure control method has strong applicability and the starting control strategies can adapt to different starting conditions
		2010 Vol. 31 (2): 145-149 [Abstract] ( 1546 ) [HTML 1KB] [ PDF 0KB] ( 647 )

	150	*Lateral stability of tractor-semitrailer under non-typical lane-change*
		Liu Hongfei, Xu Hongguo, Cao Xinyan, Ren You
		Considering the limitations of car′s handling stability methods used in tractor trailer,some new methods and improvement measures for handling stability of tractor trailer under non-typical working conditions were discussed.System dynamics model for tractor-semitrailer was established.＇S＇ lane-change under non-typical working conditions was simulated and analyzed.The responses to the changes of car′s body rolling angle and lateral acceleration in the relative tractor were revealed.The lateral stability of system was improved through the imposition of saddle damping moment.The simulation results show that it is effective to reduce yaw amplitude and shimmy frequency through damping torque.The reference for research on the handling stability of tractor-semitrailer under non-typical working conditions is provided.
		2010 Vol. 31 (2): 150-154 [Abstract] ( 1532 ) [HTML 1KB] [ PDF 0KB] ( 683 )

	155	*Performance and emission characteristics of diesel engine with different fuels*
		Ye Lihua, Yuan Yinnan, Sun Ping, Shi Aiping, Shi Zhongguang, Hu Jianyue
		As a kind of green alternative fuels,the physio-chemical characteristics of biodiesel,emulsified fuel and the micro-emulsified fuel were analyzed.The experiments of engine performance and emissions fueled with the standard 0# diesel,Karte biodiesel,micro-emulsified diesel,sunflower oil and micro-emulsified biodiesel on the YZ4102ZLQ engine were carried out.The results show that the specific fuel consumption of different fuels and heat efficiency change with the different modes based on the same diesel engine speed and power.The emission of CO reduces when using vegetable oil and biodiesel and the emission of smoke reduces when using micro-emulsified diesel.Micro-emulsified biodiesel can decrease NOx and smoke emission obviously,while HC and CO emissions increase.
		2010 Vol. 31 (2): 155-159 [Abstract] ( 1502 ) [HTML 1KB] [ PDF 0KB] ( 642 )

	160	*Effects of oxidation time on micro-arc oxidation coatings formed on Ti6Al4V alloy*
		Liu Zhongde, Sun Maojian, Fu Hua, Zhang Zhongyuan, Xiang Zhengqun
		To improve biological performance on titanium alloy surface, micro-arc oxidation （MAO） method was used to prepare ceramic oxide layer containing calcium and phosphor on surface of Ti6Al4V alloy. The effects of oxidation time on. the surface morphologies, thickness, elements, phase contents of the MAO coatings were investigated when a constant current regime of micro-arc oxidation was applied. The results show that with the increasing of oxidation time, the roughness of the coating surface increases gradually, the growth rates of the MAO coatings decrease, the content of calcium increases in proportion to the time, the content of phosphor increases degressively and the relative content of anatase TiO2 first increases, then decreases.
		2010 Vol. 31 (2): 160-164 [Abstract] ( 1667 ) [HTML 1KB] [ PDF 0KB] ( 628 )

	165	*Preparation and characterization of silicone/montmorillonite nanocomposites by in-situ intercalative polymerization*
		Yuan Xinhua, Li Xiaohui, Zhu Enbo, Hu Jie, Cao Shunsheng, Liu Zheng
		By using cetyltrimethylammonium bromide（CTAB） as organic treatment agent,phenylmethylsilicone/organic montmorillonite（OMMT） nanocomposites were prepared by in-situ intercalative polyme-rization.The internal structure and morphology of the nanocomposites were characterized by X-ray diffraction（XRD）,scaning electron microscope（SEM） and transmission electron microscope（TEM）.Mechanical properties,high temperature resistance and barrier performance for gas and water were also studied.The results show that molecules of silicone chains are inserted into the layer of montmorillonite（MMT）,and the interlayer distance of MMT is expanded effectively after polymerization of phenylmethylsilicone prepolymer and methyl methacrylate,even forming exfoliated nanocomposites.The silicone/OMMT nanocomposite which contains 8% OMMT has better high temperature resistance and barrier properties with low thermal weight loss of 25% at 750 ℃.The nanocomposite,containing 6% OMMT,has better mechanical performance with tension strength of 6.264 MPa,which is 5 times more than that of pure silicone.When the nanocomposite contains 4% OMMT,the compression strength is 11.503 MPa,which is 4 times bigger than that of pure silicone.
		2010 Vol. 31 (2): 165-169 [Abstract] ( 1445 ) [HTML 1KB] [ PDF 0KB] ( 629 )

	170	*Preparation of nano-alumina powder by active carbon micro-reactor method*
		Chen Caifeng, Chen Zhigang, Wang Andong
		Porous and structurally-ordered active carbon was prepared firstly by chemical activation technology with ZnCl2 as activating agent.Due to its characteristics of high rate of pore and easy to remove at high temperatures of active carbon,the pore was regarded as a field of localized reaction and named active carbon micro-reactor.Chemical reaction was limited in a small pore.Preparations of the precursor and powder using these pores were studied and the effect of the micro-reactor was also investigated.The results show that the precursor particles were scattered in the reactor wall with the uniform and spherical size,the spherical precursor particles were firmly adsorbed on the reactor wall.The temperature of the powder crystal transform was in step with the micro-reactor removal.The micro-reactor was effective in preventing the reunion in the process of sinter.At last,the alfa phase alumina powders with excellent dispersion and size distribution were obtained
		2010 Vol. 31 (2): 170-173 [Abstract] ( 1337 ) [HTML 1KB] [ PDF 0KB] ( 579 )

	174	*Numerical analysis on axial crash performance of thin-walled high strength steel column structures*
		Li Nan, LIi Jiankang
		Thin-walled column structures absorb large amount of energies during vehicle collision,and it is necessary to study the impact properties of these structures with the extensive use of advanced high strength steels.Spot-welded closed-hat structures made of three grades of high strength steels were selec-ted,and their axial crash performances with different sheet thickness were compared.The changes of local geometry and material property caused by stamping were investigated,then the numerical simulation of stamping process was carried out and the forming residual data were mapped into the crash models.The influence of forming data on different models was studied and the predicted mean impact forces by numerical simulation were compared with those predicted by theoretical formula.The results show that the stamping process makes the structure local thinning and material work-hardening,which are more obvious for dual phase steel;introducing forming residual data changes the buckling manner and sequential deformation mode of the axial crash deformation.Therefore the forming history can not be ignored during the crash simulation,especially for advanced high strength steels.Although there are some deviations between the numerical simulation results and theoretical solutions of mean impact forces,they both show that dual phase steel has better deformation energy absorption capacity than the others.
		2010 Vol. 31 (2): 174-178 [Abstract] ( 1170 ) [HTML 1KB] [ PDF 0KB] ( 639 )

	179	*Simulation model of combustion process of micro HCCI free piston engine based on Matlab*
		Wang Qian, Chen Bo, Chen Ze
		In order to investigate work performance of a micro HCCI free-piston engine,Matlab was applied to simulate its single-impact combustion process.A zero-dimensional numerical model incorporating global chemical kinetics,heat transfer,blow-by and a perfect gas model were developed.The simulation results were compared with experimental results from a reference.The combustion processes in the micro HCCI free piston engine with different initial free piston velocities were simulated by using the kinetics-leakage model and some conclusions were obtained.The results show that the kinetics-leakage model matches the practical result well and the initial free piston velocity has an important influence on the combustion process.The computational results provide a design basis for micro free-piston engine
		2010 Vol. 31 (2): 179-183 [Abstract] ( 1456 ) [HTML 1KB] [ PDF 0KB] ( 647 )

	184	*An experiment on nucleate pool boiling heat transfer of aqueous surfactant solutions*
		Sonng Xinnan, Gu Jiaqiang, Hu Zicheng, Wang Qian
		Based on thermo-gravimetric analysis experiments of surfactants and thermal stability experiments of aqueous surfactant solutions,experiments for nucleate pool boiling of water with different aqueous surfactant,99% sodium dodecyl sulfate（SDS）,Triton X-100 and Triton X-114,were carried out under atmospheric pressure to investigate boiling heat transfer enhancement characteristics.Bubble behaviors were observed with high-speed digital camera.The results show that surfactantshave good thermal stability when temperature is below 200 ℃,surface activity of surfactant solutions have significant changes after four days continuous boiling.Comparing with water,the optimal heat transfer enhancement is achieved near the critical micelle concentrations（CMC） of surfactants.The degree of heat transfer enhancement is different with different surfactants and is influenced by solubility characteristic,ionic nature and chemical structure of surfactants.Boiling in surfactant solutions,when compared with that in water,is observed to be more vigorous with smaller-sized,more regularly shaped and faster departure frequency bubbles,but the surfactant solutions of Triton X-100 and Triton X-114 become cloudy for the cloud point of surfactants
		2010 Vol. 31 (2): 184-188 [Abstract] ( 1325 ) [HTML 1KB] [ PDF 0KB] ( 612 )

	196	*Head node of indoor wireless sensor network based on GSM*
		Zhang Xiliang, Zhang Weihua, Li Pingping, Zhang Rongbiao, Zhang Feng
		The indoor three-level wireless sensor network system was constructed to realize the low latency and highly effective wireless control of the greenhouse environment information.Head node for remote and short distance wireless communication was designed,which was one of the key elements of network system.The cluster head node was made up of short wireless communication module CC2430 and global system of mobile communication GPRS module.The wireless transceiver program based on the Zigbee protocol and the GSM network transmission program based on the embedded TCP/IP protocol were designed.The results of the network system experiments show that the greenhouse environment physical quantities such as temperature can be obtained momentarily,and the system has lower cost,lower latency and quicker response compared with the general wireless sensor network.Efficient and wireless information communication between the wireless sensor node and remote management computer is realized.
		2010 Vol. 31 (2): 196-200 [Abstract] ( 1318 ) [HTML 1KB] [ PDF 0KB] ( 749 )

	201	*Rotor position self-sensing in induction motor based on transient excitation*
		Chen Yuhai, Liu Beiying, Hu Zhenghuan, Chen Xianzhong
		To track the rotor position of an induction motor at standstill and higher speeds,an approach by superposing twice subtraction of current transient samples was proposed.Voltage test pulse generated by inverter was injected into the phase windings,and the transient current changes were evaluated to obtain the parasitic effects due to rotor position.The mathematic model for an inverter-fed induction motor excited by transient pulses was discussed.According to the non-ideal behavior of dead-time effect and side-effects,which were caused by PWM inverter in sensorless control system,the simulated waves of current transient change due to exciting pulses with and without dead time were compared,and a compensation method was introduced to reduce the dead-time effect.An improved inverter side passive filter was proposed for mitigating dv/dt values of common-mode and differential-mode as well as the distortion of transient current response.The rotor position information for a 3 kW induction motor was derived by the method,and the feasibility of the proposed method was verified through experiments.The results show that the transient current has parasitic effects to reflect rotor position.
		2010 Vol. 31 (2): 201-205 [Abstract] ( 1604 ) [HTML 1KB] [ PDF 0KB] ( 619 )

	206	*Tracking regions of interest in moving people*
		Lin Qing, Shi Zhenjie, ZhanN Yongzhao, Xu Jianhui
		In order to improve the performance in tracking moving people when they were partially occluded,a new joint tracker of good robustness was proposed.The regions of interest（ROI） from human motion area were firstly obtained by an improved saliency map algorithm,and then ROI was tracked by the method proposed.The advantages of sum of squared differences（SSD） and color-based Mean-Shift（MS） tracker were adopted in the joint tracker.Kalman filter was used to evaluate the state.Simultaneously,the joint points which were produced by joint saliency map algorithm were used to track ROI instead of the global ones.Results of experiments show that the joint tracker is better when the ROI is partially occluded.The method is suitable for real-time tracking the regions and possesses a good robust performance.
		2010 Vol. 31 (2): 206-209 [Abstract] ( 1591 ) [HTML 1KB] [ PDF 0KB] ( 642 )

	210	*Acquisition of optimal credible rules in ordered interval-valued decision systems*
		Xie Jun, Song Yuqing, Chen Jianmei, Sun Huaijiang, Yang Xibei
		An ordered decision system for interval value processing was studied.To solve the problem that the interval value could not be compared directly,a method of grey′s whitening was introduced in ordered interval-valued decision system and a new ordered whitening value decision system was constructed.The credible rules of the increasing and decreasing objects could be obtained by this new decision system.The reductions and relative reductions were deeply investigated in terms of the decision classes of these two objects,and a reduction of credible rule was the conjunctions of the smallest number of property,which preserved the support set of such credible rule.Furthermore,the judgment theorems and discernibility functions with respect to these reductions were obtained,and an illustrative example was discussed.The decision system constructed here provides a new theoretical and practical approach to gene-rate all optimal credible decision rules from the ordered decision system.
		2010 Vol. 31 (2): 210-214 [Abstract] ( 1211 ) [HTML 1KB] [ PDF 317KB] ( 1582 )

	215	*Simulation of inter-satellite direct spread spectrum communication system for formation-flying micro-satellites*
		Wu Guoqiang, Sun Zhaowei, Wu Baolin
		The method of space circular formation order optimized design was given by using the reformed heredity algorithm based on three micro-satellites flying in formation on a same orbit and by performing the three dimensional solid mapping for terra.The method could ensure steady formation order for a long time under various perturbations.The calculated formula of the inter-satellite links of LEO formation-flying satellite was derived according to the special requirements of inter-satellite links of the formation-flying micro-satellite,and the transmitting power was also confirmed through the simulation.The inter-satellite direct spread spectrum communication system was set up,and the simulation demonstration was performed.The input waveform and the output waveform match well.The simulation results provide a good theoretical basis for the formation flight and for the inter-satellite communication demonstration experiment.
		2010 Vol. 31 (2): 215-220 [Abstract] ( 1063 ) [HTML 1KB] [ PDF 0KB] ( 622 )

	221	*Treatment of low concentration oily ballast water from Yangtze River by ozone oxidation*
		Chu Jinyu, Cai Xiaoxiao, Fan Di, Guan Helan
		Concerning the pollution status of Yangtze River by oily ballast water,ozone oxidation technology was applied to solve this problem.The principle of using the ozone oxidation technology to treat ballast water was introduced.The oil removal rate and some factors,such as ozone concentration,liquid temperature and treatment time were analyzed.The results show that the oil removal rate of oil ballast water reaches over 90 percent after 8 minutes′ oxidation by ozone when the mass concentration of the ozone gas load rises to 8.28 mg/L.In addition,the temperature does not affect the removal of the oil significantly and pH plays an important role in the process.The pH and COD of the oily ballast water decline in the ozone oxidation process.
		2010 Vol. 31 (2): 221-224 [Abstract] ( 1427 ) [HTML 1KB] [ PDF 0KB] ( 630 )

	225	*Isolation and characteristics of perchlorate degradation bacterial strains*
		Peng Yinxian, Wu Chundu, Ning Degang, Chen Chuanxiang, Guo Jing
		By using selective culture medium,a bacterial strain JD15 which could deoxidize perchlorate was isolated from the perchlorate sewage.Based on the analysis of strain JD15 on cell shape,structure,physiochemical characteristics and sequence similarity,the strain was defined as G-,Brevibacterium with high sequence similarity of 16S rDNA and perchlorate reductase alpha subunit precursor（pcrA） gene to Dechloromonas sp.agitata（AY180108.1）.JD15 grew well under the conditions of t=25 ℃,pH=7 and ρ（ClO-4）=5×10-3～5×103 mg·L-1.When JD15 grew in medium containing 0.5~10 mg·L-1 perchlorate for 4 or 30 days,perchlorate decreased by more than 50% and 80%,respectively.The results suggest that JD15 has a potential for perchlorate removal in environment.
		2010 Vol. 31 (2): 225-229 [Abstract] ( 1320 ) [HTML 1KB] [ PDF 358KB] ( 1673 )

	230	*Analysis of concrete box-girder temperature and strain based on long term observation*
		Lei Xiao, Ye Jianshu, Wang Yi, Wu Wenqing
		The temperature and strain data of a post-tensioned continuous concrete box-girder bridge have been monitored for five years.Based on the measured data,the temperature in the different positions of the concrete box girder was systemically analyzed to extract the temperature variables,including the vertical temperature differences throughout the bridge cross section and the concrete strains in the different aspects of the bridge cross section.A method for predicting the maximum value of the vertical temperature diffe-rences of concrete box-girder with 100 mm asphalt pavement and without pavement was proposed by use of the correlation analysis based on the daily maximum environment temperature.The correlation coefficient between the daily maximum environment temperature and the maximum vertical temperature difference in concrete box-girder with 100 mm asphalt pavement was 0.73.The computational model of temperature difference was developed.The relationship between the maximum vertical temperature difference and the concrete maximum strain increment was established by regression analysis.The correlation coefficient between the maximum vertical temperature difference and the concrete maximum strain increment in the bottom plate is 0.64.The relationship is quite useful in estimating the strain value in concrete box-girder.
		2010 Vol. 31 (2): 230-234 [Abstract] ( 1187 ) [HTML 1KB] [ PDF 0KB] ( 659 )

	235	*Load experiments and finite element modeling of CFRP cable stayed bridge first in China*
		Cai Dongsheng, Liu Ronggui, Xu Fei, Zhou Shijin
		A load test of the carbon fiber reinforced plastics（CFRP） cable stayed bridge first in China was introduced.A finite element model（FEM） of this bridge,based on beam elements,shell elements and bar elements was established.A finite element analogy of this structure was carried out,and the simulated results were contrasted with test results.The analysis results show that the results of static analysis based on above FEM agree well with experiments,so it is appropriate to use this model in a static analysis of CFRP cable stayed bridge.At the same time,the results of test indicate the stiffness in-service and the carrying capacity of the CFRP cable stayed bridge first in China conform to the specifications and design requirements.The overall performance of this structure is fine.The test and related analysis results provide reference for further engineering applications of CFRP cable bridge structure.
		2010 Vol. 31 (2): 235-239 [Abstract] ( 1276 ) [HTML 1KB] [ PDF 0KB] ( 654 )

	240	*Time delayed differential equation model and its dynamic analysis for energy price*
		Tian Lixin, Qian Heping
		On the basis of traditional cobweb model and price theory and from practice of the operation of the energy economic system,a nonlinear time delayed differential system for energy price adjustment is established,with energy demand function as nonlinear function and energy supply function as linear function.Applying the main monomial analysis method and Hopf bifurcation theory to analyzing the equilibriumpoint of the system,the locally stable or periodically oscillations by adjusting parameters are found.The conditions,under which the equilibrium point is locally stable or Hopf bifurcation occurs,are given.The relevant conclusions for energy economic system are reached.
		2010 Vol. 31 (2): 240-244 [Abstract] ( 1383 ) [HTML 1KB] [ PDF 0KB] ( 654 )

	245	*Stability analysis of dynamic model about enterprises competition with time delays*
		Yao Hongxing, Wang Nana
		The competition between small and middle enterprises is regarded as Cournot-Bertrand competition model.By introducing Cournot-Bertrand competition model with time lags between competitors and themselves,and by analyzing the effect of two kinds of time delays on model′s stability,the sufficient condition is derived.By studying how the area of stability changes through theoretical analysis and numerical simulation,it is discovered that unstable region will expand when the delays and time increase.It is concluded that enterprises can get more advantages through reducing information delays
		2010 Vol. 31 (2): 245-248 [Abstract] ( 1222 ) [HTML 1KB] [ PDF 0KB] ( 599 )

江苏大学学报（自然科学版）

　

News

　

·	关于近期网络不稳定情况的说明

·	Our journal has be included in JSTChina Database

·	Our journal has be selected for the 2015-2016 China Science Citation Database (CSCD)

　　　　　　　　　　More

　

Links

　

·	Chinese Library Classification Number

·	Society of China University Journals

·	China National Knowledge Infrastructure

·	Chinese Sciencepaper Online

·	Transactions of the Chinese Society for Agricultural Machinery

·	Journal of Southeast University：Natural Science Edition

　　　　　　　　　　More

Copyright © 2011 Journal of Jiangsu University(Natural Science Eidtion)
Support by Beijing Magtech Co.Ltd E-mail：support@magtech.com.cn