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Table of Content

      
    16 February 2008
    Volume 38 Issue 1
    Articles
    Toughening and strengthening mechanisms of the mechanical properties of Al2O3/(W, Ti)C nanocomposite
    ZHOU Yong-hui,AI Xing,ZHAO Jun,YUAN Xun-liang,XUE Qiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  1-4 .  doi:
    Abstract ( 348 )   PDF (593KB) ( 1834 )   Save
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     Al2O3/(W, Ti)C ceramic nanocomposites were fabricated from nanocrystalline α-Al2O3, micro-crystalline α-Al2O3 and (W, Ti)C. The flexural strength and fracture toughness can be remarkably increased by adding nano Al2O3(11%) particles into Al2O3 matrix. The flexural strength, fracture toughness and hardness are respectively 840MPa, 6.55MPa·m1/2 and 20.1GPa. TEM experiments indicate that low contents of nano-particles could refine matrix grains, and the microstructure of the material is a homogenous skeleton structure. The fracture characteristics are mixed by inter-granular fracture and transgranular fracture. Strengthening and toughening mechanisms are interpreted due to intragranular and inter-granular grain synergistic residual stress, changes of fracture manner and  an increase of the fracture toughening.
    An DNC system based on SCA specification and its application
    GONG Yi-guang,GONG Yi-guang,BAI Jun-jie,WANG Ning-sheng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  5-8 .  doi:
    Abstract ( 417 )   PDF (551KB) ( 1707 )   Save
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    Hetero-structure and integration are always problems of a DNC system. Service component architecture provides a good specification and solution to eliminate these two problems. The main business functions of the DNC system were ascertained after referring to all kinds of documents and lots of DNC business systems, and a model of the DNC system based SCA specification was subsequently worked out. This model consists of  four layers: application layer which provides service interfaces for other applications, a service layer which offers services of business functions, a composite layer which supplies composites for services and an implementation layer which gives business logic and basal datum for composites. In addition, a detailed introduction concerning implementation by Java for the composite of initializing communication between serial ports and computers was provided.
    Power distribution of a given trajectory generation for a hybrid-driven five-bar mechanism
    CHEN Zheng-hong,ZHANG Wo-bo,WANG Yong,LIU Tong-hui,LI Yan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  9-12 .  doi:
    Abstract ( 373 )   PDF (384KB) ( 1678 )   Save
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    A hybrid-driving five-bar linkage mechanism is a new type of mechanism. The hybrid mechanism is a configuration combining the motions of two characteristically different electric motors by means of a five-bar mechanism to produce programmable output. Based on the study of the workspace of a hybrid-drive five-bar mechanism, the analysis of inverse kinematics and dynamics of the mechanism was developed, and a mathematical model of power calculation was obtained. In order to perform time-variety successive trajectory tracking, the PD control algorithm was applied to control the servo motor. The trajectory generation such as beeline and parabola was simulated with Matlab, and then the law of power distribution of trajectory generation was obtained.
    Mathematical model and numerical simulation of the air inlet flowfield of a natural-draft cooling tower
    WANG Kai,SUN Feng-zhong,ZHAO Yuan-bin,GAO Ming,GAO Shan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  13-17 .  doi:
    Abstract ( 431 )   PDF (315KB) ( 1746 )   Save
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     The performance of a cooling tower has great effects on the economy and security of a power plant, which is badly affected by crosswinds. A mathematical model of the air inlet aerodynamic field of a natural draft wet counter flow cooling tower was established. A heat and mass transfer model of the tower is built as well. In addition, a detailed numerical simulation was provided by the finite volume method. Distribution rules of the air inlet aerodynamic field were studied. Field experiments were put forth in a cooling tower of a power plant, of which the data obtained were compared with simulated data. It can be used to evaluate the performance of a cooling tower and to calculate the ventilation quantity and resistance of the air inlet. It also provides theoretical proofs for the design and performance optimization of a cooling tower.
    Advances of saturated iron core fault current limiters
    LIU Hong-shun,WANG Wei,ZOU Liang,LI Qing-min
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  18-23 .  doi:
    Abstract ( 391 )   PDF (631KB) ( 2422 )   Save
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    Both the advantages and disadvantages of traditional fault current limiting technology were analyzed. The analysis indicates that development of a new fault current limiter with economical and technological excellence was significant and urgent for present day power grids. With reference to the general operation principle of the saturated reactor, different topologies, and key obstacles encountered in engineering applications of the super conducting saturable magnetic core fault current limiter (SMFCL) were elucidated. Permanent magnetbiased saturated iron core fault current limiters (PMFCL) of various topologies were compared during their evolution process. Further, three novel topologies for threephase PMFCL were presented. Finally, four principal technological issues were raised with relative elucidation with regards of the optimal structure design of PMFCL.
    The traditional instruments performance optimization by virtual instrument technology
    ZHANG Hui,WANG Zhi-chen,SUN Rui
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  24-27 .  doi:
    Abstract ( 387 )   PDF (413KB) ( 1697 )   Save
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    To satisfy the increasing modern testing requirement in function and precision by making good use of traditional instruments, the functional extension and performance optimizing method of traditional instruments were described in detail based on the virtual instrument and GPIB technology, including the whole process of designing hardware and application software by LabVIEW. The feasibility of virtual instrument technology was proved by extending the function and optimizing the performance of a traditional twochannel oscilloscope. The experiment achieves expected goals and acquires good effects.
    On noise elimination properties and sensitive voltage control methods of ZnO ring varistors
    YANG Zhi-jian,SU Yuan-bin,SHEN Yong-he,MA Yu-min,FAN Kun-tai5
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  28-31 .  doi:
    Abstract ( 380 )   PDF (359KB) ( 1673 )   Save
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    ZnO ring varistors are widely used in noise elimination of recorders. Important conclusions achieved by analysis were that the varistors with slow changing I-V curves are better than those with break changing for the elimination of high energy noise of recorders. However, it is quite the contrary for the elimination of low energy noise. The methods and the principles of the varistors sensitive voltage control were presented. Also, solutions of the devises sensitive voltage on a larger scale after being wedded were raised. The experimental results indicate that the analysis is correct and the methods are simple and effective.
    Medical image fusion based on DT-DWT
    CHEN Shuang,JIANG Wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  32-35 .  doi:
    Abstract ( 397 )   PDF (350KB) ( 1651 )   Save
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    Shift invariant and directionally selective dual tree complex wavelet transform were introduced, and acrossbandneighborhoodspacefrequency and improvedneighborhoodentropy were defined for highpass and lowpass subbands respectively. The results demonstrate that this method is more efficient in image fusion than real wavelets.
    A variable stepsize affine projection algorithm based on a variable data-reuse factor
    NIE Cong,LV Zhen-su
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  36-38 .  doi:
    Abstract ( 381 )   PDF (384KB) ( 1767 )   Save
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     The dimension of a next input signal matrix can be determined by the variation of the condition number between current and previous steps, which are the datareuse factor and stepsize. Then the conflict between convergence rate and stable-state error was settled by these two dynamic factors. Simulation results show that under the presupposition of considerable computation reduction, the convergence rate of this algorithm is close to the high dimension situation, and the stable-state error is nearly the same as the low dimension condition. The convergence stability is also improved. 
    Swimmer detection based on background subtraction
    CUI Ying,CHEN Wen-kai,LEI Fei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  39-42 .  doi:
    Abstract ( 328 )   PDF (357KB) ( 1705 )   Save
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    Swimmer detection for visual surveillance of a pool was studied. A fixed camera installed on the pool wall can obtain a consecutive sequence of visual surveillance. A Gaussian mixed model was used to describe each pixel, and a selfadapted background model was set up, which can be updated.  The shadows and noises must be removed to obtain better results after the foreground objects are separated. The experimental results show that this method is effective in detecting swimmers and eliminating shadows.
    A new control strategy of a tristate boost DC/DC converter based on input-output linearization
    LIU Zhao-juan,LIU Jin-bo
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  43-47 .  doi:
    Abstract ( 401 )   PDF (426KB) ( 1696 )   Save
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    In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC/DC converter, Viswanathan K has proposed a novel tristate Boost DC/DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to  the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.
    A PID tuning method for integrating processes
    ZHAO Yong-guo,JIA Lei,CAI Wen-jian
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  48-51 .  doi:
    Abstract ( 397 )   PDF (310KB) ( 2479 )   Save
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    Abstract: A PID auto-tuning method based robust specification for integrating processes with time delay was proposed using two feedback loop design technique. A robust specification was proposed in this paper. An internal feedback loop was added and the integrating process was converted into a generalized stable process for the proportional controller in the feedback loop. So the common PID autotuning method can be used to tune the integrating process. With the proposed PID tuning method and the defined robust specification, the controller can overcome the structural limitation of a typical PID controller for integrating processes, and guarantee both robustness and performance. Simulation examples were given to show the superior performance of the proposed tuning method against other methods.
    Research on a noncontact parallel continuous square billet online definitelength cutting system
    BI Xia-fei,SUN Tong-jing,YANG Fu-gang,ZHANG Wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  52-55 .  doi:
    Abstract ( 383 )   PDF (392KB) ( 1712 )   Save
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    Because of low-accuracy and easy-damage of the contact definite-length measurement, a non-contact continuous square billet online definite-length cutting system was designed based on machine vision. Through regular image capture, preprocessing and length calculation, the computer could calculate the length of the square billet on-line. For the definite length, the computer would send a cutting signal to the PLC, then the PLC would control the cutting machine, and the square billet could be cut to a definite length. At the length calculation stage, a forward contourtracking algorithm was presented by tracking the upper edge pixels, which could track the head of the square billet and accurately calculate the length. In addition, the multi-threading parallel process technique was applied, which could greatly reduce the runtime of the program. Experimental results show that this system can achieve the goals of realtime, stabilization and highaccuracy.
    The clustering protocol based on a sleeping and selective-gateway mechanism
    CAI Zhong-xin,ZHANG Hua-zhong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  56-60 .  doi:
    Abstract ( 352 )   PDF (349KB) ( 1477 )   Save
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    Based on the  concept of clustering, this protocol adopts a kind of sleeping mechanism and selectivegateway mechanism. A protocol used for largescale wireless sensor networks—SSGM was proposed. This protocol adopts the passive clustering strategy to construct network topology. The selection of cluster head takes a mechanism, which is called “first declaration wins". The gateway was selected according to the rule of the  robust network and the equalization of energy consumption. Based on the assurance of high rate of coverage, some nodes were selected to keep sleeping, which accord with conditions. So this protocol can reduce unnecessary consumption of energy and the possibility of signal collision. Taking into account the robust network and the equalization and economy of energy consumption, SSGM can effectively prolong the lifetime of the network.
    Study on an approach of transformation and representation based on the SolidWorks model to the virtual assembly model
    CHEN Cheng-jun,ZHOU Yi-qi,YANG Hong-juan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  61-65 .  doi:
    Abstract ( 441 )   PDF (329KB) ( 2505 )   Save
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    To transfer the SolidWorks assembly model to the virtual assembly model, model transformation of a virtual assembly system was divided into two processes: the part model transformation and the assembly constraint model transformation. The OpenFlight database, which is a standard format for virtual simulation, was used to represent the part's multi-level model. An assembly restriction model was expressed by the object-oriented multilevel model. These two models were associated with each other by the nodes' name. The virtual assembly model was reconstructed on the virtual assembly system based on the OpenGL Performer. The results verify that this method is simple, feasible and extendable.
    Numerical analysis on the stability of a rocksalt roadbed with two circular cavities
    ZHANG Bo,LI Shu-cai,YANG Xue-ying,WANG Xi-ping,ZHANG Dun-fu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  66-69 .  doi:
    Abstract ( 339 )   PDF (357KB) ( 1270 )   Save
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    The stability of a rock-salt roadbed with two circular cavities is analyzed as a planar strain stress problem with the element-free Galerkin method(EFGM). The critical loads were presented for the cavities at  different depth. The numerical results show that EFGM is not only effective but also flexible for a stress intensity problem with two cavities.
    Research on some problems about a classified highway in a water net plain district
    YAO Zhan-yong,LI Yun-heng,SHANG Qing-sen,LI Shi-hua,ZHANG Hong-bo ,
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  70-73 .  doi:
    Abstract ( 314 )   PDF (480KB) ( 1935 )   Save
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    The mechanics problems of a roadbed and pavement structure of a classified highway in a water net plain district were studied. Through the limited element method, the force influence zone of the roadbed under a heavy load circumstance was calculated, and the mechanical response of the pavement structure on a higher water table was analyzed. The roadbed supportability under different compactness and the water content circumstances was experimentally  studied. The forceinfluenced zone of the roadbed is over 2 meters under the heavy load circumstance so that  the roadbed height of the existing classified highway is not serious enough and that there is a much deeper area below ground within the force influence zone. Because of elastoplasticity variation of the soil, the elastic modulus of the Yellow River alluvial (silting) soil can not reflect the bearing capacity of a roadbed in a high water content situation. Under the standard axle load condition, the deflections of the road surface have reached to 34.07mm and exceeded the design value. The high water table gives much important influence to the fatigue life of the base and the sub-base, especially the subbase. Corresponding project countermeasures were put forward.
    Application of the TSP geological forecast method of a mountain tunnel in a karst zone
    SUN Ke-guo,LI Shu-cai,ZHANG Qing-song,XUE Yi-guo,LI Shu-chen,XU Zhen-hao
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  74-79 .  doi:
    Abstract ( 393 )   PDF (778KB) ( 1680 )   Save
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    Hydrogeological and engineering geological conditions of tunnels, in karstdeveloped areas, are always highly changing and complex. In engineering investigation work, it is difficult to prove positions, sizes and properties of bad natural geological bodies, which may induce geological hazards in the course of construction. In order to avoid security accidents triggered or produced by rough construction such as water flush, mud (sand) rush, collapse etc, it is urgent to do research on the predictions of bad natural geological bodies in the construction period. TSP can effectively predict positions, sizes and properties of bad natural geological bodies which are located 100~150?m ahead of the tunnel working face. Using TSP geological forecast technology to probe karst tunnels, several TSP forecast examples of the highway tunnel in a karst zone were thoroughly analyzed, the exact responses of underground river and karst caves were established, and the distinguishing rule was obtained.Future work for similar geological forecasts could be guided to some extent.
    Three dimensional stability analysis of the effect caused by wheel load of a rock bolt crane girder
    SUI Bin,ZHU Wei-shen,LI Shu-chen
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  80-83 .  doi:
    Abstract ( 382 )   PDF (434KB) ( 1607 )   Save
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    Combined with the extended project practice of the underground powerhouse at some hydropower stations, the effect caused by deformation of concrete, rock mass and bolt on a rock bolt crane girder was considered, and the FLAC3D code was applied to simulate and analyze the wheel load stress state of a rock bolt crane girder on the chamber during the operational phase. The stress distribution of bolts on a crane girder and the stability of the interface between rock and crane girder were also investigated. The numerical results suggest that this can be a powerful approach to the stability analysis of a rock bolt crane girder.
    Research on rock soil liquefaction of the Qingshui railway tunnel under dynamic vibration load
    JIA Chao,ZHAO Jian-yu,XU Bang-shu,YUE Chang-cheng,LI Shu-chen
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  83-87 .  doi:
    Abstract ( 371 )   PDF (864KB) ( 1889 )   Save
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    A rock-soil railway tunnel may show a liquefaction phenomenon under train dynamic vibration load during the  operational period. Train dynamic vibration load was first simulated. Based on the simulation vibration load, a vibration load - time curve was obtained. The rock-soil railway tunnel liquefaction probability under train dynamic vibration load of the Qingshui railway tunnel was researched by using the popular finite difference software FLAC3D. Finally some conclusions were obtained which is valuable for tunnel construction and tunnel maintenance during the operational period.
    Effect of phosphorus removal and microbial morphology of a biologically aerated filter
    ZHAO Yu-xiao,LI Shan-ping,QIAO Peng,ZHANG Qi-lei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  88-91 .  doi:
    Abstract ( 378 )   PDF (430KB) ( 2209 )   Save
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    The character of microbial morphology in a hangingmembrane phase and regular operation phase and the effect of removing dissolvable phosphate was analyzed in a device of BAF for the treatment of beer wastewater. It was shown that BAF can not  continually remove considerable soluble phosphate because the removal rate of phosphate quickly achieves a maximum but then is soon reduced. It was also found that microbial morphology was obviously influenced due to hangingmembrane, back washing, and the height of the filter material.
    Application of modified activated carbon fiber in the treatment of phosphorus-containing wastewater
    YANG Jing,YUE Qin-yan,LI Ying,LI Ren-bo,GAO Bao-yu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  92-95 .  doi:
    Abstract ( 358 )   PDF (264KB) ( 1917 )   Save
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    An activated carbon fiber (ACF) was placed in a solution of ferrous sulfate at different conditions to improve its adsorption capacity.  The primary factors affecting phosphorus adsorption on a modified ACF were analyzed by the orthogonal experimental method. The best modifying conditions are that pH value is 3, the concentration of FeSO4·7H2O is 100kg/m3, the m(FeSO4·7H2O)/m(ACF)=2.5, and time of stirring is 3 hours. The modified activated carbon fiber was used to study static adsorption of phosphoruscontaining wastewater and the adsorption isotherm was determined. The effects of factors such as adsorption time, the amounts of ACF and the  pH on adsorption efficiency were studied. Experimental results show that a modified ACF  effectively removes phosphorus.
    A signal simulation method based on a wavelet neural network with an interval-accuracy of time-frequency
    HU Gang,FENG Xiang-Qian,CHEN Xin,CAO Li
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  96-100 .  doi:
    Abstract ( 380 )   PDF (307KB) ( 1621 )   Save
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    This paper is about a signal simulation method based on a wavelet neural network with an interval-accuracy of timefrequency. With forecast accuracy and the property of local concentration of a time-frequency domain and a related theory of a neural network, an ideal signal function can be translated into  a time-frequency interval number, and then a method was given to calculate the quantity of the neural network unit, and to approximate wave function. Finally a wave function with forward accuracy of time-frequency was applied to simulate a signal by a neural network.
    A fast power algorithm of continuous multiprecision integers
    GENG Jian-yan,ZHANG Li-jiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  101-104 .  doi:
    Abstract ( 382 )   PDF (213KB) ( 1659 )   Save
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    A fast power algorithm for continuous and semi-continuous multiprecision integers was proposed, and its complexity was also analyzed.  The general algorithm was compared with the fast power algorithm. The experimental results demonstrate that this new proposed algorithm is more efficient than others. Finally, the algorithm was applied to a quadratic sieve.
    A new design experiment for diffraction theory application
    JIANG Guo-xin
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  105-108 .  doi:
    Abstract ( 424 )   PDF (291KB) ( 1687 )   Save
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    Students were asked to determine the experimental method and procedure, by themselves, to measure laser wavelength and the diameter of a filament using familiar appliances or implements. This new experiment wants students to analysis the measures used in the experiment to improve testing efficiency. The obtained results show higher precision. Students can  more fully understand diffraction theory and its application by this experiment than by using traditional ones to measure wavelength by spectrometer and diffraction grating.
    Preparation and characterization of two-dimensional  Bi2O3  nanoslices
    LV Wei,WU Li-li,XU Run-chun,WU You-shi,GAI Hong-de,ZOU Ke
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  109-112 .  doi:
    Abstract ( 496 )   PDF (543KB) ( 2468 )   Save
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    Employing the physical vapor deposition method, Bi2O3 powder was heated to 1050℃ at normal pressure in a horizontal tube furnace with the protection of argon gas and oxygen, and then cooled and deposited naturally. A great deal of two-dimensional nanostructureBi2O3 nanoslices with regular rectangle morphologies were obtained on the silicon substrate. The length, width and thickness of the obtained nanoslice are respectively about 1200nm, the 300nm, and  10~15nm. The composition, morphology and microstructure of Bi2O3 nanomaterials were characterized by energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and high resolution transmission electronic microscope (HRTEM). The influence of the substrate placing way to the quantity of depositions was investigated.
    A microcalorimetric study of the optimum temperature of astarch enzymatic catalyzed reaction
    RU Miao-yan,WANG Ming-gang,LU Cheng-xue,ZHANG Hong-lin
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  113-115 .  doi:
    Abstract ( 400 )   PDF (214KB) ( 1482 )   Save
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     The powertime curves of a starch enzymatic catalyzed reaction were determined by using the 2277 thermal activity monitor (Sweden). According to thermokinetic theory and reduced extent method, the values of Km and Vmax were calculated and the following equation, Km=2×10<sup>-7</sup>T<sup>3</sup>-1.9×10<sup>-4</sup>T<sup>2</sup>+6.284×10<sup>-2</sup>T-6.746 and the optimum temperature T=313.53K were obtained.
    A delay-dependent robust stability criterion for uncertainneutral systems with time-varying delay
    WANG Yan-qing,QIAN Cheng-shan,JIANG Chang-sheng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  116-120 .  doi:
    Abstract ( 413 )   PDF (239KB) ( 1443 )   Save
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    The delay-dependent robust stability for uncertain neutral systems with time-varying delay was studied. Based on the LyapunovKrasovskii functional approach, delaydependent robust stability conditions were proposed for neutral type uncertain systems with time-varying delay by introducing some relaxation matrices that can reduce the conservation of the criteria.  The conclusion was presented in terms of linear matrix inequality (LMI), which allows the delay-derivative (t)≥1 and is less conservative than the existing results.Finally, a numerical example was given to illustrate the correctness of the obtained results.
    The effect of carbon on organic wastewater degradation in the process of pulse discharge
    NIU Xiu-ming,FU Chun-hua
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2008, 38(1):  121-126 .  doi:
    Abstract ( 347 )   PDF (376KB) ( 1227 )   Save
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    The function of activated carbons and activated carbon fibers were investigated in the process of combined treatment of pulsed streamer discharge when used for degradation of organic wastewater. The result shows that a synergetic effect has formed when the pulsed streamer discharge is combined with the activated carbons or the activated carbon fibers, and the degradation rate of methyl orange has been enhanced 22% and 24% respectively. The activated carbons and the activated carbon fibers primarily play a catalytic role in the combined treatment. The reaction mechanism is that ozone is induced to cause a radical chain reaction and generate hydroxide radicals by the activated carbons and the activated carbon fibers surface. Further data analysis indicates that regeneration of activated carbons and activated carbon fibers is achieved in this process. With the addition of H2O2, synergistic effects are generated for the formation of the hydroxyl radical, which raise the utilization ratio of O3 and UV. Furthermore, it is also helpful in the regeneration of the activated carbons and the activated carbon fibers.