最新刊期
卷 40 ， 期 2 ， 2008
- 摘要：Abstract:High head ogee spillway is the most usual way for medium or low head hydropower stations to reconstruct the spillway tunnel. Due to the condition limitation of the topography and geology, some stations cannot employ in this way. A new way to reconstruct diversion tunnel into sudden enlargement flood release tunnel with pressure is proposed in this paper. The experiment researches show that this reconstruction have the characteristics as follows: water flow directly flows from pressure to open channel flow and the flow pattern is simple; the direction of the tunnel can be changed flexibly according to the actual condition of topography、geology and construction on the level surface; the work gateway can be arranged at the intake or at the junction between the pressure flow and the open channel flow; the structure is simple, the construction is convenient and the cost is low. The flood release tunnel rebuilt in this way is applicable to the station with medium or low head and large discharge, which will have high practical value.关键词：diversion tunnel;sudden enlargement flood release tunnel;pressure flow;open channel flow;hydraulic characteristics
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发布时间：2023-11-28 - 摘要：Abstract:In order to study displacement based seismic design method of near fault ground motions, 30 earthquakes and 132 near fault ground motion records were selected as statistical samples. The elastic displacement response spectra formula of near fault ground motions was proposed from the statistical average elastic displacement response spectra. The response spectra formula can reflect the effect of focal mechanism and ground soil. It can be concluded that the elastic displacement design response spectra of near fault ground motions proposed in the paper is close to the average elastic displacement response spectra of actual earthquake waves, and it can be applied in seismic design of structures subject to near fault ground motions.关键词：near fault ground motion;displacement response spectra;seismic design;ground soil
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发布时间：2023-11-28 - 摘要：Abstract:The two layer turbulence model combining mass transfer model and settling model was used to establish a mathematical model describing flowing, mixing and settling characteristics in rectangular primary settling tanks. The Semi Implicit Method for the Pressure Linked Equations (SIMPLE) method was used on pressure correction. The hybrid finite analytic method with staggered grid was used to solve this model. The simulation results obtained using the mathematical model were compared with the experimental data and simulation results available in literatures, and the results of comparison indicate that the profiles of the velocity field at Re=10900 and the recirculation length increasing with Reynolds number range from 2500 to 25000 in case of incoming flow coming from the bottom are in agreements with the experimental results and simulation results of Imam; the Flow Through Curve (FTC) obtained using the mathematical model are in good agreement with the curves based on experimental data and simulation results of Imam, and the accuracy of predicted FCT is higher than Imam’s results. Under the low Suspended Solids (SS<150～200 mg/L) concentration, the influence of solid phase to the fluid phase could be ignored, the mathematical model could be used to predict the remove efficiency, and the results are in good agreements with other predicted values available in literatures. The flow field changes when the incoming flow coming from the middle part of the inlet, there are two vortices in the inlet region in this case, and the predicted results were verified by comparing with Adams and Rodi’s work. It is therefore concluded that the mathematical model and HFAM approach can be used to simulate the turbulent flow, mass transfer and settling process in rectangular primary settling tanks with low SS concentration wastewater.关键词：settling tanks;hydrodynamics;Turbulent flow;model;Hybrid finite analytic method
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发布时间：2023-11-28 - 摘要：Abstract:When flaring gate piers are on surface spillways in high arch dam, the dispersion of plunging jets from surface spillways is closely related to the charateristics of flow. The k-ε two equational model for turbulent flow is applied to numerically simulate the 3 D flow to find out the characters. The results of numerical calculations are in good agreement with those of model test and shows that the pressure distributions on middle line and sidewalls show similar behaviours, but the difference is that the pressure of sidewalls has local increasing near the turning point of the flaring gate piers. Because of the influence of streamline curving in flaring gate piers, the pressure distribution of end parts of flaring gate piers does not agree with the law of pressure distribution in still water. It is also found that velocity of flow change varies little along the depth, but the vector of velocity changes apparently.关键词：high arch dam;surface spillways;flaring gate piers;hydrodynamic characteristics;numerical simulation
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发布时间：2023-11-28 - 摘要：Abstract:As rock deformation,fracture and energy exchange with outer environment happen at the same time, the rationality to study rock destruction with energy methods is discussed in this paper. For there are many kinds of energy in the deformation of rock such as elastic energy, plastic energy, surface energy, radiation energy, kinetic energy etc, authors anatomize the process of energy transformation among these energies, calculation theories, different effect on rock fracture, and study energy dissipation and energy release in different deformation process in macroscopic and microcosmic aspects. In microscopic aspect, rock storages energy in the form of elasticity energy and dissipates energy by damage evolving in the initial deformation stage and releases plenty of energy in later stage. In microcosmic aspect, there are many factors which can harden or soften the rock. Whether the rock storages energy or releases energy is determined by the final results of these microcosmic factors′competition. And the theoretical equation of energy transformation is deduced. On the base of test, transformation and balance, as well as ration between dissipation energy and release energy are studied. Finally, this paper demonstrates that energy dissipation leads to the strength reduction, while energy release results in the catastrophic failure of rocks. Consequently, from the viewpoint of energy dissipation and energy release to study the failure of rock, we could understand the essential physical mechanism of rock deformation and fracture, find out the true reason for rock failure, and offer reference to the engineering practice.关键词：rock;energy transfer;energy dissipation;energy release
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发布时间：2023-11-28 - 摘要：Abstract:Stability can be evaluated more reasonably by analysis of systematic reliability of rock slope with various sliding surfaces. Using nonlinear FEM, the possible sliding surfaces could be found by reducing rock strength, and a failure mode is defined that all the elements of the sliding surface are destroyed synchronously; According to Druker Prager yield rule and uniaxial tensile rule, the performance functions of elements are built, the reliability indexes and correlation coefficients are computed by response surface method and Monte Carlo method; Each failure mode is a parallel system consist of the elements of each sliding surface, so a stepping equivalent linear method was researched to calculate the reliability index of each failure modeFinally, the reliability index of the series system composed by all failure modes can be estimated by Ditlevsen narrow bound method. The reliability index gained from the above method can be applied to appraise slope stability. For example, the systematic reliability of a slope was analyzed, which shows the method is rational and feasible.关键词：rock slope;reliability;finite element;response surface method;Monte Carlo method
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发布时间：2023-11-28 - 摘要：Abstract:To overcome the parameter inversion’s difficulty from the measurement uncertainty, mathematical model based on Bayesian inference was set up to estimate the coefficients in 2D convection diffusion equation with source. By Bayes’ theorem, the posterior distribution of model parameters was obtained, which is the solution of the inverse problem. While for multi parameter inversion problem, the posterior distribution obtained by numerical computation is hard to express easily,Markov chain Monte Carlo method is used to explore the posterior distribution to get the estimation. The effect of the observation position on inversion results was investigated and the form of the likelihood function’s effect was also studied. It indicates that the Laplacian distribution can lead to a robust estimation. Comparing the estimates under different number of measurement points, it can be concluded that at least two points are needed to ensure reasonable solution for the two parameters estimation problem of 2D steady convection diffusion equation.关键词：Bayesian inference;convection diffusion equation;Markov chain Monte Carlo simulation;environmental hydraulics;robust estimation
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发布时间：2023-11-28 - 摘要：Abstract:Seismic reliability is very important to the seismic design of the bridge. Based on theory of the response surface of random vibration and response spectral method, an algorithm for the seismic reliability analysis of the structure with random parameters is proposed in this paper. The seismic reliabilities of the basket handle arch subjected to seismic excitation in its design basic period are studied. The random of the structure parameters and the site condition of this bridge are taken into account when the arch ribs’ failure seismic reliabilities are computed respectively at the low level earthquake, design earthquake and high level earthquake. According to the “three level seismic fortification criterion” in the code for seismic design of bridge, the seismic reliabilities of the arch ribs are calculated in their design basic period. The conclusion shows that the design of this bridge meets the demands of the seismic code.关键词：response surface method;seismic reliability;response spectrum;random parameters;basket handle arch
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发布时间：2023-11-28 - 摘要：Abstract:Construction traffic and transport of large scale underground adits is a large and complex system engineering problem. This paper conducted the large scale underground adits traffic and transport simulation system (UPCTS), which is based on the product line balance theory. It is a practical and developable system, which can judge of the feasibility and optimization for construction traffic transport of large scale underground adits quantificationally through simulating excavation and lining in whole process. It was used in diversion tunnel project of JinPing second cascade hydropower station and it has demonstrated the feasibility of construction transport scheme and given out optimization advice for transportation manner and vehicle type.关键词：large scale underground caverns;construction traffic and transport;simulate analysis
- 2012
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发布时间：2023-11-28 - 摘要：Abstract:Systematic experiments were carried out in a 16 m high gas solid CFB riser with FCC particles to investigate the drag force acted on solids by gas. Based on the measured data of the cross sectional average solids holdups at different axial locations of riser under various operation conditions and through the dynamic balance analysis of single particle, drag coefficients were indirectly obtained. The results show that the solids holdups have great effect on drag coefficients, which obviously decrease with increasing solids holdups. Considering the effects of Reynolds number, Archimedes number and solids holdups, a new correlation for drag coefficients was developed. The predicted values of the new correlation for drag coefficients were compared with the experimental data of this work and some other authors, and a good agreement was observed for three different particles. Using the drag coefficient correlation, the axial pressure gradients of gas solid flow in riser are successfully predicted.关键词：circulating fluidized beds;riser;gas solid flow;drag coefficient
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发布时间：2023-11-28 - 摘要：Abstract:The central composite design was used to evaluate the combined effects of heating temperature (88~96 ℃), pH (5.1~6.3), sodium chloride concentration (1.5%~3.5%, w/v) and initial counts of Bacillus cereus (4~7 log10 CFU/mL) on the survival of Bacillus cereus in meat products . The response surface analysis was carried out to develop an efficient polynomial equation for predicting the changes of response variables. The results of regression analysis showed a high coefficient of determination value (R2) of 0.9644 for the response surface model, thus ensuring a satisfactory agreement of the polynomial regression models with the experimental data. The analysis of variance (ANOVA) demonstrated that the interactions of environmental factors, heating temperature and pH had an extremely significant effect on the survival of B. cereus (p＜0.01). The initial counts could significantly influence its survival (p＜0.05) while the effect of sodium chloride concentration was of no significance (p＞0.05).关键词：meat product;Bacillus cereus;environmental factors;combined effect;response surface analysis
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发布时间：2023-11-28 - 摘要：Abstract:Magnetic field was introduced to the experiment of re doping polyaniline (PAn) by sulfasolicylic acid（SSA）. Effects of the magnetic intensity, concentration of doped agents and reaction time on the conductivity, solubility and thermo stability of PAn were studied,and the properties of PAn were characterized by four probe, thermogravimetric analysis (TGA), UV Vis and XRD. The results showed that the conductivity, solubility and thermo stability of PAn were obviously improved in magnetic field, due to the effect of the cooperative effect of SSA and magnetic field. In compared without magnetic field that the conductivity was increased from 0.5 s/cm to 3.2 s/cm; the solubility in xylene was also increased from 12% to 23%; and the temperature of thermal decomposition was improved from 220 ℃ to 320 ℃.关键词：magnetic field;polyaniline;re doping;sulfasolicylic acid
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发布时间：2023-11-28 - 摘要：Abstract:In order to study the SCC susceptibility and obtain basic data for corrosion protection of X70 pipeline steel in the acid soil environment of Yingtan, China, slow strain rate test(SSRT) and polarization curves were used to studied the SCC of X70 steel. SCC did occur to the as received material, with a transgranular cracking mode charged with different cathodic potential. The applied cathodic polarization potential played an important role in facilitating the occurrence of SCC. X70 pipeline steel was little sensitive to SCC in an anodic potential condition, but as the applied cathodic potential went down, a combined electrochemical reaction of anode and cathode or a cathode process at even lower potential controlled the corrosion behaviour of X70 steel, and SCC took place.关键词：X70 pipeline steel;SCC;acid soil environment
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发布时间：2023-11-28 - 摘要：Abstract:The effect of solid solution temperature on the shape memory effect and martensite transformation temperature of Cu-18Al-10Mn alloy were studied. Experiment results showed that after quenching and up quenching heat treatment, the shape recovery rate of the alloys increased when the solid solution temperature changed from 650 ℃ to 900 ℃, and reached the maximum value at 850 ℃. With the solid solution temperature increasing, the temperature of martensite transformation increased.关键词：shape memory alloy;shape recovery rate;solid solution temperature
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发布时间：2023-11-28 - 摘要：Abstract:To discuss the security of RSA type cryptosystem over conic curves on the ring Z/nZ, two algorithms of short private exponent attack on such cryptosystems were presented. Two simple examples illuminating the algorithms were also given. The results showed that the RSA type cryptosystem over conic curves on the ring Z/nZ can not resist short private exponent attack. In other word, the parameter n can be factored in polynomial time of lnn if the private exponent is too small.关键词：cryptology;conic curve;short private exponent attacks;continue fraction
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发布时间：2023-11-28 - 摘要：Abstract:Xue and Cao proposed a threshold proxy signature scheme using self certified public keys, but this scheme was insecure. An attack against this scheme was proposed. By this attack, an adversary could forge an illegal proxy signature. That is, based on the proxy signature generated by proxy signers on a message on behalf of an original signer, an attacker could forge a valid threshold proxy signature on the same message which seemed generated by these proxy signers on behalf of this attacker himself. After producing a forged proxy signature, the adversary had the same authority with the original signer to the proxy signer, and the verifier could not distinguish which one was the real original signer. Especially, this attack was used to change proxy signatures into threshold signatures belonging to the group that actually generated the proxy signatures. The causes of the security deficiencies existing in this scheme were analyzed and an improvement which could resolve these security deficiencies was further proposed.关键词：threshold proxy signature;proxy signature;threshold signature;self certified public key;ID based
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发布时间：2023-11-28 - 摘要：Abstract:In order to improve the efficient of digital audio watermarking embedding, by exploiting the new formulas of simultaneously calculating the discrete Fourier transform and inverse discrete Fourier transform of a N real sequence, an improved digital audio watermarking embedding scheme was proposed. From the analysis of DFT’s properties and the symmetry of DFT,the new formulas of simultaneously calculating the DFT and IDFT of a real sequence were obtained. The new formulas were applied to digital audio watermarking embedding algorithm. Experiments showed that the new scheme can increase the watermarking embedding performance by 30%.关键词：real N point sequence;discrete Fourier transform;inverse discrete Fourier transform;digital audio watermarking
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发布时间：2023-11-28 - 摘要：Abstract:Artificial immune recognition system (AIRS) had been proved a highly effective classifier,and successfully applied to pattern recognition. However, the huge size of evolved memory cells pool and low classification accuracy limited the further applications of AIRS. In order to overcome these limitations, a supervised artificial immune classifier, referred to as AIUC, was presented. The implementation of AIUC included: initially, a pool of memory cells were created. Then, through the learning of each training antigen, B cell population was evolved until the B cell population was convergent, and the memory cells pool was updated by the optimal B cell. Finally, classification was accomplished by majority vote of the k nearest memory cells. Compared with AIRS, AIUC showed the improvements for the percentages reduction of memory cells pool by 5.6%, 18%, 19.6% and 31%, respectively, meanwhile, the classification accuracies increased to 98.2%, 96.9%, 78.3%, and 92.3%, for the famous Iris dataset, the Ionosphere dataset, the Diabetes dataset, and the Sonar dataset, which were used for testing classification algorithm, respectively. In addition to its nonlinear classification properties, AIUC possessed biological immune system properties such as clonal selection, immune network, and immune memory, which could be better used to pattern recognition, anomaly detection.关键词：artificial immune system;supervised classification;machine learning
- 2027
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发布时间：2023-11-28 - 摘要：Abstract:To solve the problem of reducing prescription effects of traditional Chinese medicine,the fuzzy neuron and the radial basis function was applied to the neural network, a prescription effect reduction algorithm named PERA (Prescription Effect Reduction Algorithm) based on fuzzy neural network was proposed, and a prescription effect reduction system named EFNN (Effect Fuzzy Neural Network) was developed. Experiments demonstrated that the proposed method is better than other traditional attribute reduction algorithms, such as artificial neural network and rough set. The precision of effect reduction of PERA is greater than 90%, the recall is about 40%, greater than traditional attribute reduction algorithms, and its running time is less than traditional neural networks obviously.关键词：effect reduction;fuzzy neuron;Radial basis function;fuzzy neural network
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发布时间：2023-11-28 - 摘要：Abstract:To decide the selection of information security solution, a Multi attribute decision making method was given. The factors which affected the selection were analyzed, including the expense of purchasing the security devices, the cost of operating and maintaining the security measurements, the effectiveness of the solution to reduce the risks. By the computation of some indexes related to the factors, an order of the solutions was obtained to show the priority, and the best one can be selected by the order. Based on the method, the factors which influenced the decision got balance, and the method was compact and efficient.关键词：information system;security solution;multi attribute decision making
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发布时间：2023-11-28 - 摘要：Abstract:The grid is one of major technologies to transform the vertically integrated silos to horizontally integrated, service oriented systems. Because the grid nodes are heterogeneous and diverse, a 3 dimension architecture of grid information assurance system was proposed to get the information assurance of grid environment. The first dimension consisted of the application layer governed by service manager, the trusted grid infrastructure, the security virtualization, and the trusted resources; the second dimension consisted of trust manager, security policies manager and security monitor among which the policies manager was the core; the third consisted of the services strategy, the services organization, and the services operation. The trust manager, security policies manager and monitor were also designed. Computer simulation showed the proposed architecture works well.关键词：Grid;grid security;security policies;trust management;information assurance
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发布时间：2023-11-28 - 摘要：Abstract:Nonlinearly Filtered Generators are widely used in modern cryptosystems, and it is remarkably significant to study its cryptographical properties for cryptography and cryptanalysis. The properties of Boolean functions were introduced, Expansion Function and Expansion Spectrum were defined, and the measure of information leak of Nonlinear Filtered Generator was given. The key causation that the output sequence of Nonlinearly Filtered Generator leaks the information of its input sequence was brought out. An attack based on the information leak of the Nonlinearly Filtered Generator was put forward. This method could be used to attack those cryptographic algorithms using Nonlinear Filtered Generator as a part of pseudo random sequence generator. An example was proposed to show how to determine the inputs of Nonlinearly Filtered Generator when its outputs was given.关键词：cryptanalysis;nonlinearly filtered generator;expansion function;expansion spectrum;information leak
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发布时间：2023-11-28 - 摘要：Abstract:The point spread function（PSF）in computational optical sectioning microscopy (COSM) technology was always unknown and hard to obtain. This brought a lot of difficulties to image restoration. Based on least square and optimal theory, a parameter estimation method using variable metric was proposed for 3D point spread function. In addition, to overcome the traditional EM algorithm’s limit such as serious detail loss, a conjugate gradient least square(CGLS) algorithm for the restoration of 3D images was developed. The optimal real image estimation was obtained through alterative iteration between the parameter estimation of point spread function and the real images estimation. Experimental results showed that the new algorithm could successfully identify blurs and restore images, in a short time.关键词：computational optical sectioning microscopy;least square;blur identification;image restoration
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发布时间：2023-11-28 - 摘要：Abstract:In order to extend the application range of ESPI to visualizing in real time airflow motion, a FFT followed by a digital phase only low pass filter and an inverse FFT were applied to ESPI carrier fringe patterns for removing speckle noise, and then the original ESPI carrier fringe patterns were replaced with the input images. The low pass filtered patterns were regarded as normal interference fringes that in high contrast and low noise, and airflow field information was contained in it. The change of spatial phase caused by the process of replacing image, and a correlative correction term in measurement of airflow field were obtained by a simulated test interferogram. A phase extraction method based on gray scanning was proposed for calculating phase difference in real time airflow motion,and phase extraction using Fourier transformation profilometry was carried out in spatial domain，also along the time axis. The temperature distribution were calculated using phase extraction.This method can be used in dynamic ESPI measurements of airflow field availably.
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发布时间：2023-11-28 - 摘要：Abstract:To solve the fault diagnosis of turbo generato generator,the Novel Extenics Immune Algorithm was proposed. Based on the characteristics of Extenics which can describe the system behavior by the qualitative and quantitative investigation, and the learning mechanism and the self nonself mechanism of the immune system, the B cell detector matter element and antigen matter element were established . Firstly, according to fault sample data, the B cell detector was created by self nonself mechanism of immune system, the affinity distance function between the antibody and the antigen was adopted the connection function of the Extenics.Secondly, the B cell detector was trained by the immune learning mechanism using sample data.Then, the algorithm was used to the fault diagnosis of the turbo generator and the fault was correctly identified.关键词：extenics;immune algorithm;fault diagnosis;turbo generator
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发布时间：2023-11-28 - 摘要：Abstract:GDROV (General Detection Remotely Operated Vehicle) is a kind of open frame remotely operated underwater vehicle，which is designed for the inspection of cracks, crevices and other potential problems of the dams. The paper gives a particular introduction of the configuration of GDROV’s motion control technology. Firstly, a least-square technique is utilized to estimate the hydrodynamic coefficients of the vehicle, and a four DOF simulation system is constructed. Secondly, motion control system architecture of GDROV is introduced, which includes hardware and software structure. The hardware based on PC104 BUS, adopts AMD ELAN520 used as the controller’s embedded CPU and all control modules work in VxWorks ,which is a powerful real time operating system. Lastly, Information flow of motion system of GDROV, motion control algorithm and dead reckoning algorithm are also explained.关键词：GDROV;embedded system;VxWorks;PC104 bus;system architecture
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发布时间：2023-11-28 - 摘要：Abstract:Aim to the question about how to integrate different information and knowledge during applying CAx systems, the architecture of CAx integrated system based on knowledge for auto drive axle was proposed. A method of similar case retrieval of measurement of feature parameters was proposed by adopting knowledge description based on ontology, and knowledge was reused. The key technologies of the system , such as case based reasoning, knowledge drive design of auto drive axle face design flow, method of CAD modeling based on feature parameters, CAE analysis based on model sharing, and virtual assembly were studied. The system platform was developed, and the integration of CAD/CAE cab be carried out based on knowledge. With the platform, design of auto drive axle was helped efficiently.关键词：auto drive axle;CAx;integration;ontology
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发布时间：2023-11-28 - 摘要：Abstract:A new methodology used to solve the problem of the selection of key thermal points of the CNC machine tool thermal error based on the grey synthetic degree of association was proposed. After calculating the degrees of different thermal points with respect to the machine thermal error, selection was made on the rules proposed. The method was applied to the research of a CNC turning center, and finally 4 key thermal points were picked out from 16 candidate points. The compare result indicated that the model constructed by using the key thermal points can significantly improve the robustness, that the calculation process of the methodology is much easier than the existed methods, and that the criterion is simple and clear.关键词：CNC machine;thermal error;modeling;grey synthetic degree of association
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发布时间：2023-11-28 -
Synthetically Modeling for the Thermal Error and Cutting Force Induced Error on a CNC Turning Center
摘要：Abstract:Thermal deformation and cutting force induced deformation of the machine tool structure are two most significant causes of machining errors,and error compensation technique is an effective way to improve the manufacturing accuracy of the NC machine tools. Effective compensation relies on an accurate error model that can predict the relevant errors during machining. Since a PSO BP neural network modeling technique was developed to build the error model of thermal error and cutting force induced error. The PSO BP neural network model not only enhances the prediction accuracy of the thermal errors but also reduce the training time of the neural networks. Experimental results showed that the machining error of a turning center has been reduced from 27 μm to 8 μm.关键词：thermal error;cutting force induced error;PSO algorithm;NC machine tool- 2300
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发布时间：2023-11-28 - 摘要：Abstract:Making pure rolling shear as the target, on the basis of the principle analysis of spatial shear mechanism in new type rolling shear, the optimized mathematical model of shear mechanism was established with guide rod as additional design variable. Depending on the development project on extensive popularization of 3000 mm cut to length rolling shear with single shaft and double eccentricity for some large Iron & Steel plant, the rod dimensions of shear mechanism was optimized, and the motion path was simulated. The calculating results, such as overlap quantity between the upper blade and lower blade, horizontal translation of tool arc and open degree, showed that the optimized model with guide rod as additional design variable helps to obtain the rod dimensions of pure rolling shear mechanism, decreases horizontal translation of blade arc, evenly distributes blade overlap quantity and ensures the function of setting open degree. On site overlap quantity, blade arc displacement of integration, the actual value of open degree and high quality steel cross section of production prototype,also proved the validity of optimized mathematical model.关键词：rolling shear;shear mechanism;optimization model;shear quality
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发布时间：2023-11-28
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