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Table of Content

      
    16 December 2010
    Volume 40 Issue 6
    Articles
    Air quality predicting model based on the resource allocation network of structure optimization
    JIANG Zhi-fang1, WANG De-ming2, DU Xiao-liang1, MENG Xiang-xu1, LI Shen-fang1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  1-7. 
    Abstract ( 227 )   PDF (1232KB) ( 1689 )   Save
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    According to the time-varying characteristics of the urban air quality, an air quality predicting model using the resource allocation neural network and the hidden layer nodes correlation pruning algorithm was established. The model had  simple structure and the online learning capability. Training and testing results showed that the model could not only reduce the complexity of the network structure, but obtain more accurate forecasting than the usual resource allocation neural network.

    Multiagent cooperation learning based on an evolutional algorithm
    WANG Yun, WANG Jun, HAN Wei*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  8-11. 
    Abstract ( 363 )   PDF (662KB) ( 1264 )   Save
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    Reinforcement learning is  not applicable concerning large state-actions, since that its convergence speed increases exponentially with the number of dimensions of state-action space. In many situations, this problem partially can be solved  by utilizing a cooperation relationship among agents. An evolutional algorithm was put forward, which could rapidly find the effective updating of state-action pairs by the evolutionary operators such as reproduction as well as die out. Simulations proved that the algorithm performs was better than present multiagent cooperation learning algorithms.

    Optimization positioning algorithm in a non-line of sight environment  based on orthogonal polynomial fitting
    XUE Lin1, LIU Ju2, XIN Hua-mei1*, HE Jing-liang2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  12-16. 
    Abstract ( 232 )   PDF (984KB) ( 1412 )   Save
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     A positioning algorithm based on time-of-arrival in a non-line of sight environment is presented. First, a priori knowledge of standard deviation of measurements noise was exploited to decide whether there were non line of sight errors in time-of-arrival measurements. Then a weighted orthogonal polynomial fitting technique was used to correct the measurements contaminated by non-line of sight errors and consequently give the estimation of location of  a mobile station. Finally, mean estimation errors by least squares algorithm and constrained weighted least squares algorithm in line-of-sight environment were calculated and the CramérRao lower bound was also given. Computation results show that the proposed algorithm can effectively reconstruct the range measurements and achieve better location accuracy in a non-line of  sight environment.

    Multi-sensor optimal information fusion for time-delay systems with multiplicative noise
    ZHANG Mei1,3, FU Xiao-ling2, CUI Peng1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  17-23. 
    Abstract ( 242 )   PDF (700KB) ( 1533 )   Save
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    The locally optimal predictor and globally optimal linear weighted fusion algorithm were investigated for linear time-delay systems with multiplicative noise. The problem could be transformed into an optimal state estimation problem of a stochastic system with unknown time-varying noises through compensation of fictitious noises. The locally optimal predictor was presented by the reorganized innovation approach and projection theory in Hilbert space, and then the globally optimal linear weighted fusion algorithm was given by solving Riccati-type equations with the same dimension as the sensor subsystems. Compared with the centralized optimal filter by augmentation, the proposed approach could reduce the complex of calculation. A numerical example and its simulation results were given to show the effectiveness of the proposed method.

    A price subsidy contract for an agricultural product supply chain based on fairness preferences
    LIAO Li1, WU Yao-hua1, SUN Guo-hua2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  24-31. 
    Abstract ( 184 )   PDF (417KB) ( 1619 )   Save
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    The incentive mechanism of a price subsidy contract for a two-level agricultural product supply chain was studied. The supply chain consisted of one manufacturer and two suppliers. The former was the leader, and the latter which had fairness preferences were the followers. The product quality was decided by sampling inspection. The results under the riskneutral assumption showed that, when the  inspection cost coefficient was little and the product randomness was strong, the extreme team achievement evaluation contract should be adopted, and the incentive efficiency was the same as that of selfinterest. In other cases, the middle joint contract was better than the extreme relation achievement evaluation contract except when  guilt mentality was strong. Also, the incentive efficiency was promoted, and the incentive efficiency income had a positive relationship with the inspection cost coefficient and a negative relationship with the intensity of product randomness.

    Construction of a fuzzy membership function based on interval number
    YU Shao-wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  32-35. 
    Abstract ( 261 )   PDF (524KB) ( 2995 )   Save
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    An approach based on interval number for constructing a fuzzy membership function considering some problems existing in statistical methods was proposed.The conception of the youth using interval number was described, the interval number was transformed into a limited boundary fuzzy figure based on the knowledge of interval number and fuzzy number, and then a α-cut set of a normal fuzzy number was obtained by weighted computing  extending it into a fuzzy membership function. Experimental results showed that this approach was simple and accurate with wide applicability and the fuzzy membership function was more continuous, objective and suitable to people's subjective consciousness.

    Non-invasive measurement of blood fluidity in vivo
    SUN Xin, LIU Chang-chun, ZHAO Yu-juan, WANG Xin-pei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  36-40. 
    Abstract ( 300 )   PDF (703KB) ( 1192 )   Save
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    Reduction of blood fluidity is an important risk factor for atherosclerosis and cardiovascular diseases. Frequent examination of blood fluidity has a great significance on prevention of cardiovascular diseases. A hemodynamic model of the vascular system of the upper limb was established. Based on the analysis of the decay of arterial static pressure, the blood fluidity index F was used to represent the blood fluidity in vivo. Using a function approximation method, the blood fluidity index F was calculated. Results of the experiment indicated that the method and the measurement system had  good reproducibility and  performed  well in terms of  sensitivity and  specificity.

    Probabilistic airspace congestion management model and methodology
    TIAN Wen, HU Ming-hua
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  41-47. 
    Abstract ( 271 )   PDF (1080KB) ( 1367 )   Save
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    There are still no effective airspace congestion management strategies and methodologies to slove seriously increased airspace congestion. An airspace congestion prediction model and an airspace congestion resolution model were established. The airspace congestion prediction model was used to forecast the time intervals in which the congestion occurred, and the airspace congestion resolution model was used to control the air traffic flow in the airspace with high risk congestion during predicted time intervals. The airspace congestion risk was reduced, and also  some factors such as delay cost, delay equity of different airspace users and the influence to the air traffic flow were considered. Based on  real flight data,  simulation results showed that the two models could effectively predict the time of airspace congestion in the future, rapidly find out  suitable strategies, and balance performance risk control and cost control, which provided an innovative new way for dynamic air traffic flow management.

    Straight-line tracking control of ships based on ADRC
    LIU Wen-jiang1,2, SUI Qing-mei1, ZHOU Feng-yu1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  48-53. 
    Abstract ( 181 )   PDF (1327KB) ( 1568 )   Save
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     A  ship’s straight-line tracking control system is a single-input and dual-output system. Due to the strong non-linearity and typical under-actuated properties, as well as the liability to wind, wave and current disturbance, the design of a ship’s tracking controller is  challenging work. In this paper, the mathematical model of a ship’s straight-line tracking control system was adopted and the ADRC(active disturbance rejection control technique)was also briefly introduced. The control scheme was accomplished by adding a tracking differentiator and the feedback control law comprised of the errors of the two-controlled variables, instead of  only one in the usual ADRC scheme. Compared to the usual ADRC calculation which is only suitable for single-input and single-output systems, this method expands the application range that the ADRC scheme can deal with. The simulation test results confirmed the validity of this method, showed the ADRC can acquire good dynamic performance,good steady performance, and excellent robust performance.

    Study of visual planning of  underground power pipelines based on virtual reality
    WU En-qi1, DU Bao-jiang1, WANG Hai-peng1, YU Jian-ping2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  54-57. 
    Abstract ( 180 )   PDF (1661KB) ( 1355 )   Save
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    In order to improve the efficiency of underground power pipeline planning, a real-time visualization planning method was presented based on  virtual reality. The existing underground pipeline data was transformed into three-dimensional visual objects, by which planners could see the real location of the pipeline. And then  the location and direction of the new pipeline could be determined before being laied. The area partition method was also introduced to increase render speed. About 20% working time was saved in the Shanghai Pudong power planning when  this technology was used.
     

    Design and characteristic research of an adjustable flow control valve
    AN Yan-tao, WANG Yong, CAO Fang, XIE Yu-dong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  58-62. 
    Abstract ( 260 )   PDF (1586KB) ( 1399 )   Save
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    A kind of adjustable flow control valve was designed and its structural characteristic and flow characteristic were analyzed. The adjustable flow control valve is pluggable and it can overcome the limitation of the fixed flow characteristic.  Simulation results showed that using different flow templates can change its structural characteristics, and then change its flow characteristic. The valve can be flexibly used  for different work requirements and can effectively improve the efficiency of control valve use.

    Study of the  meshing mechanism and dynamic behaviors of  the epicycloid equidistance sprocket
    SHEN Zhao-liang, WANG Yong, XIE Yu-dong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  63-66. 
    Abstract ( 282 )   PDF (1206KB) ( 1868 )   Save
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    With the enveloped method, the epicycloid equation  based on the epicycloid equidistant curve equation was obtained. The profile equation of the roller chain sprockets was obtained from the epicycloid equidistant curve. The roller chain drive models which match  GB1244-85 standard sprockets, and  Japanese standard JIS B 1801-90 sprockets, and the epicycloid equidistance sprockets were built by means of 3-D modeling techniques. Based on the ADAMS, under the condition of various rotating speed,  dynamic simulation experiments were comparatively analyzed  using three different profile models. The result showed that the chordal action can be reduced by using the epicycloid equidistance roller chain sprocket,which is more suitable for high-speed transmission.

    Numerical simulation for compressive residual stress of shot-peening based on SPH coupled FEM
    LIU Fei-hong, WANG Jian-ming*, YU Feng, ZHANG Gang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  67-71. 
    Abstract ( 325 )   PDF (1573KB) ( 1445 )   Save
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    In dealing with shot-peening simulation, FEM(finite element method)can not simulate a mass of shots impinging the target. To overcome the defect of FEM, the SPH (smoothed particle hydrodynamics) coupled FEM modeling for shot-peening was presented, in which the shots were modeled by SPH particles and the target material was modeled by FEM. The two parts interact through a contact algorithm. The material model for shot flow was established, and the relationships between compressive residual stress and peening frequencies, coverage, velocities were analyzed. Steady compressive residual stress can be obtained by repetitious peening, higher coverage can improve the distribution of compressive residual stress, higher velocities can induce higher and deeper residual stress in the target surface. The simulation results agree well with the experimental data.

    Experimental study and application of desulfurization gypsum-fly ash concrete for highway pavement
    CHEN Yu, GAO Ying-li
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  72-75. 
    Abstract ( 245 )   PDF (886KB) ( 1165 )   Save
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    A new kind of active mineral admixture was produced by blending  desulfurization gypsum and fly ash, and adding some modifiers.  C30~C40 concretes were manufactured and  the main technical performances tested. The conclusions can be made that with desulfurization gypsum-fly ash more than 30% of the total binder in mass, concrete shows no segregation, no bleeding and more excellent workability than that of ordinary concrete, with mechanical properties which meet the requirements for highway design, less than 450×10-6 drying shrinkage at 180d, and about 60% of standard limit of wear mass loss as well as higher than D300 of freezingthawing resistance grade. Also, it was successfully applied in highway pavement construction of the experimental section of Tao Hua-yuan to Hua Yuan-xi Travel Highway, which showed obvious benefits for society and  economy as well as environmental protection.

    Numerical study of concrete filled steel tube structure mechanical behavior
    ZHANG Bo1,2, LI Shu-cai1,2, YANG Xue-ying3, LI Ming-tian4,SUN Guo-fu5
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  76-81. 
    Abstract ( 203 )   PDF (1275KB) ( 1273 )   Save
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    The stress-strain relationships of concrete filled steel tube(CFST) beam element were concluded from the threedimensional finite element method and the fiber element method. The axial loaded and eccentric compression CFST structures were computed through the beam element method with the two types of stressstrain relationship deduced. The numerical results were compared with the prior test results. The results showed that the accuracy was good when the stress-strain relationship of CFST concluded from fiber element was used. The results were accurate when the stressstrain relation obtained from the three-dimensional finite element method were used in studying square crosssection CFST structures, and the numerical result deviate from experimental results when the stress-strain relationship concluded from three dimensional finite element was used in computing circular cross-section CFST structures.

    Stability assessment of a high slope based on the failure approach index and strength reduction method
    YANG Wen-dong1, ZHANG Qiang-yong1*, SONG Meng-bo2, YANG Jia1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  82-87. 
    Abstract ( 183 )   PDF (2192KB) ( 1520 )   Save
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    The displacement, stress and plastic zone of a high slope after excavation step by step were  analyzed using numerical analysis, and the important parts which should be reinforced was pointed out. The safety factor of the slope was obtained  through the finite difference strength reduction method, and on the basis of the FAI (failure approach index) concept, the criticality of the non-failure zone and degree of damage for the failure zone were  evaluated. The results proved that the two methods which are used to evaluate the excavation stability of slope can not only show the stability degree of slope, but can  also line out the position and extent of failure zones, damage zones and disturbed zones, provide the position of the sliding surface, and characterize the stability rules of the rock-mass. The methods  helpful to construction of the slope were presented.
     

    Research of  the crack resistance of asphalt mixture based on the low-temperature bending test
    LI Xiao-juan, HAN Sen, JIA Zhi-qing, ZHANG Li-juan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  88-93. 
    Abstract ( 211 )   PDF (2062KB) ( 1469 )   Save
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    The low-temperature crack resistance of asphalt mixture was evaluated using the low-temperature bending test,  and the effect of aging, modified with granulated polymer and asphalt-aggregate ratio on the bending test at low temperature were respectively studied with indicators including failure strain, tensile strength, flexural-tensile modulus and strain energy density critical value. The results showed that the crack resistance of SBS modified asphalt and soft pitch is better than that of any other asphalt. The conclusion of evaluating the low temperature crack resistance by using critical value of strain energy density is consentaneous with the fact and  the defect of the high temperature stability of soft pitch may be overcome by mixing granulated polymer when using the advantage of its low temperature crack resistance.
     

    Self-assembled 3-aminopropyltrimethoxysilane-phosphomolybdic acid film modified electrode
    WEI Pei-hai, LIU Guang-zeng, ZHANG Qi, SHI Cong-wen
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  94-99. 
    Abstract ( 238 )   PDF (1655KB) ( 1727 )   Save
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     A composite film modified glassy carbon electrode containing heteropolyanion was fabricated by attaching a Keggin—type heteropolyanion, H3(PMo12O40)·H2O, to a 3-aminopropyltrimethoxysilane (APMS) layer, which was self-assembled on an electrochemically activated glassy carbon electrode through the formation of C—O—Si bond. XPS and cyclic voltammetry were used for the characterization of the composite film. The results showed  that PMo12O403- was linked with APMS through the coulombic interaction between PMo12O403-and amine groups of APMS (PMo12O403--APMS), which greatly improved the film stability. The PMo12O403--APMS modified electrode showed three reversible redox pairs of PMo12O403- with a smaller peak-to-peak separation, which  was stable in a larger pH range compared with that in the solution phase. The catalytic properties of the modified electrode for those reduction of ClO3- 、BrO3- and  IO3- were studied. The modified electrode exhibited better electrocatalytic activities for those three anions compared with the PMo12O403- modified glassy carbon electrode. The detection limits were  1.5×10-5, 1.0×10-6, 5×10-7mol/L for ClO3-, BrO3-and IO3 seperately.

    Synthesis technology and rheological behavior of hydrogen bonding mediated interpolymer complexes drag reducer
    based on long chain methacrylate
    HUO Chao-fei1, LI Bing1, YU Ping1*, ZHANG Chang-qiao1, CHEN Xiang-jun2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  100-106. 
    Abstract ( 184 )   PDF (1317KB) ( 1909 )   Save
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    A new type of hydrogen bonding mediated interpolymer complexes based on long chain methacrylate were prepared by emulsion polymerization using K2S2O8-Na2SO3 as the redox initiator system. The effects of  synthesis temperature, the molar ratio of reductant to oxidant on drag reducing efficiency and  monomer composition on the shear stability of the complexes were studied.The influences of temperature, shearing rate, concentration and monomer composition of rheological properties of the interpolymer complexes diesel solution were also investigated. When the performance of shear stability was the best, the optimum synthesis technological conditions were obtained. Rheological studies showed that the  proton donor and proton acceptor polymers diesel solution fitted with the pseudoplastic fluid respectively, which accordded with the power-law equation. When γ.<200s-1, the rheological curve of the interpolymer complexes deviated from the power-law equation. The results also showed that the variation of viscosity with temperature and concentration of the interpolymer complexes is apparently different from that of its association predecessor. Finally, a potential measurement of shear stability was obtained.

    The solvent effect on  polyethylene terephthalate surface modification by plasma induced grafting polymerization of acrylic acid
    BA Huan-fen, SHI Lai-shun*, LIU Yan-pu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  107-112. 
    Abstract ( 210 )   PDF (1808KB) ( 1095 )   Save
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    The reactive activities of acrylic acid in different solvents were studied by UV-vis spectroscopy in order to investigate the inherent essence of mixed solvent to the influence of plasma-induced grafting polymerization. The grafted samples were characterized by UV-vis spectroscopy, FTIR and AFM analysis. The results indicated that the solvent had great influence on the grafting reaction. The grafting yield increased with an increase of the volume ratio of water to alcohol, when using alcohol and water as mixed solvent. The red shift in the UV spectrum could be ascribed to different reactive activities of acrylic acid in different solvents, and the change trend of the grafting yield. The FTIR integrated peak area of  C=O stretching increased with an increase of the grafting yield, which was nearly a linear relationship. It was confirmed that the acrylic acid was grafted onto the PET surface.
     

    The dual index grade sequence pattern recognition method for analyzing infrared fingerprint   spectra of extracts with
    chloroform of Shiquan Dabu Pills
    DONG Feng-juan, ZOU Hua-bin*, LU Wei-jie, DU Ai-qin
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  113-119. 
    Abstract ( 240 )   PDF (655KB) ( 1265 )   Save
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     A new type identification method, dual  index grade sequence pattern recognition method, was applied for identification and quality evaluation of the traditional Chinese compound formula Shiquan Dabu Pills produced by different companies. This approach possessed the  advantages of both supervised and unsupervised pattern recognition methods, which could simultaneously cluster and classify the complex biological  samples without prior knowledge. In the process, the most similar sample sequence of each sample was determined depending on common peak ratio index of samples and normal distribution. Similar samples should have ‘most similar sample sequences’, by which the samples could be  efficiently  recognized. The identification and quality evaluation of components of 22 Shiquan Dabu Pill samples produced by  three  companies extracted with chloroform were  carried out  by  this  novel approach and their infrared fingerprint spectra. The correct recognition rate of the samples was 100%, while it  was only 72.7% by a famous hierarchical clustering method, an unweighted pair-group method using arithmetic averages (UPGMA). The results showed that the  dual index grade sequence pattern recognition method together with infrared fingerprint spectra could accurately and simply  finish the identification and quality estimation of the traditional Chinese compound formula, without any prior knowledge related to the analyzed samples.

    The co-production of cyanuric acid and the ammonia used in coal-fired  flue gas desulphurization and denitrification
    LIU Xin, WANG Fu-wei, ZHANG Peng, LIU Xiao-ming, WANG Qian, ZHU Wei-qun*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  120-123. 
    Abstract ( 214 )   PDF (580KB) ( 2253 )   Save
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    A new method was proposed to prepare the derivative of urea and simultaneously to generate ammonia, which was utilized for desulfurization and reduction of NOx of flue gas. In a series of urea reactions, the reaction by which  urea was heated by microwave to prepare cyanuric acid was chosen to investigate the effect of the mass ratio of reactants, microwave power and reaction time on the reaction.The best reaction condition was obtained with the mass ratio of urea to ammonium chloride of 36∶1, heated by high power microwave for ten minutes, and refined by boiling in acid solution. The productive rate of the reaction was 70%. Compared to  existing ammonia preparation technology by urea,this technology had the advantage of no emission and could prepare  high valueadded urea derivatives.

    Multiobjective optimization of a reservoir based on NSGA2
    YUN Ru-an1,2, DONG Zeng-chuan1, WANG Hao-fang2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  124-128. 
    Abstract ( 308 )   PDF (1482KB) ( 2020 )   Save
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    The algorithm of non-dominated sorting genetic algorithm II (NSGA2)and its parameter problems were discussed and applied for multiobjective optimization of a reservoir. The Pareto front of the optimization problem was obtained and the effects of the corresponding parameters on the optimal result were discussed. The study showed that the parameters in genetic algorithms in NSGA2 (include size of tournament selection, distribution parameter in simulated binary crossover, and distribution parameter in polynomial mutation) have little effects on the optimal result, and this means that NSGA2 is robust and a set of proposed values of the parameters can be used for most multiobjective optimization problems of a  reservoir.  A big enough and even enough distributed Pareto front can be obtained when the two parameters,population size and generation in NSGA2 are big enough, and this means that NSGA2 is simple for its parameter regulation. The Pareto front obtained gradually improves  with the regulation of population size and generation, and this means that NSGA2 is stable for multi-objective optimization problems of a reservoir.

    Change of evaporation in Shandong Province over the past 50 years and associated influencing factors
    LIU Jian1, CAO Sheng-le2, ZHAI Jian-qing3, CHEN Xue-qun1, LIN Lin1, GUAN Qing-hua1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  129-133. 
    Abstract ( 270 )   PDF (1429KB) ( 1417 )   Save
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    Based on the daily measurement  data of 18 national meteorological stations in Shandong Province, statistical analysis, correlation analysis and Mann-Kendall trend test methods were selected to calculate and analyze the trend of pan evaporation and its associated influencing factors over the past 50 years. The results showed that the pan evaporation in the area declined during the studying period,  the  rate of decending was  about 8.78mm/year and  the decline in summer and spring was particularly significant. Spatially, the evaporation decrement increases gradually from coastal area to the inland. After comparison among the meteorological elements, including net solar radiation, wind speed, temperature and vapor pressure difference, in Shandong Province during the same period, it was inferred that the decline of evaporation is a result of multiple factors, among which the net solar radiation and wind speed are the main factors.

    The design method and application of the non-inductive Chua′s circuit
    ZHANG Xin-guo1, XU Chong-fang1*, WANG Jin-shuang1, YAN Ji-cong1, HAN Ting-wu1,2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  134-138. 
    Abstract ( 283 )   PDF (1309KB) ( 2765 )   Save
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    The classical Chua′s circuit design is difficult to accurately improve  because the presence of the inductor can cause  a big error. To solve this problem, a non-inductor chaotic circuit with the same output as the classical Chua′s circuit was presented. The corresponding static circuit structure(limiting-amplitude circuit)was found by deep analysis of the static characteristic curve of Chua’s diode. Combined with CNN technology, Chua′s circuit consisting of  a pure operational amplifier  was designed and two kinds of static nonlinear circuits used in Chua′s circuits were also given. Simulation results and physical experimental results showed that the design fully reaches anticipative objectives. The comparison results showed that  the Chua′s circuit with limiting-amplitude nonlinear circuits was the optimal design.

    A numerical model analysis and optimization of layout for a mechanical ventilating cooling tower
    GAO Kun-hua, XU Shi-qian, ZHENG De-sheng, HAN Jing-qin, WANG Wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  139-143. 
    Abstract ( 278 )   PDF (1564KB) ( 1727 )   Save
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    The spacing distance between two parallel mechanical ventilating cooling tower rows was designed too large according to the relevant Chinese Design Codes in the Indonesian 4×600MW Thermal Power Plant. A mathematical model experiment was made to analyze the influence of local practical environment factor and spacing distance of tower row on cooling effort, evaluate the environmental wind’s influence on reflux and disturbance of exhaust wet air in different cooling tower row layouts, and optimize the cooling tower row layout. It was concluded that as its long axis parallels the  dominate summer wind direction, the spacing distance has no influence on wet air reflux and spacing distance can be decreased from 51m to 21.6m, and thereby the site area of the plant is reduced with guaranteed cooling effort.
     

    Prediction of protein-protein interaction sites using ensemble neural networks
    SHEN Xiao-li, CHEN Yue-hui
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  144-149. 
    Abstract ( 193 )   PDF (1094KB) ( 1480 )   Save
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    Protein-protein interaction sites are very important in drug design and construction of protein interaction networks. A data set that contained 35 proteins was used. First, 3 features of the  proteins were extracted. They were sequence profiles, entropy and accessible surface area. Then back propagation neural networks and their integration were applied to predict proteinprotein interaction sites. One protein was tested each time and the remaining 34 proteins were used to train the classifiers (one-crossover). The final result was good and when adding one new feature the accuracy of prediction  improved. When integrating these features the outcome has more accuracy than a single  classifier.

    The experiments on NO emission characteristics of  lean coal blended with  different coals
    SUN Ying, WANG Yong-zheng*, BIAN Su-fang, YUE Mao-zhen, WANG Ming
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  150-155. 
    Abstract ( 240 )   PDF (1857KB) ( 954 )   Save
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    An algorithm for computing  the all longest increasing subsequence
    YANG Hai-bin, ZHAO Xue-feng, WANG Xiu-hua, ZHANG Li-xiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(6):  156-158. 
    Abstract ( 249 )   PDF (288KB) ( 1382 )   Save
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    The  Cover-Making(CM) algorithm of the longest increasing subsequence was analyzed, and  a new algorithm that can compute a sequence’s all longest increasing subsequences was presented, based on the CM algorithm. The complexity of the time isO((m+1)k+(n-k)log k), and the complexity of the space is O(n+km).