最新刊期
卷 40 ， 期 3 ， 2008
- 摘要：Abstract:A set of mathematical model is developed and the scouring of aerated jet flow on river bed is simulated. Relationship between the scour depth and the pressure and velocity near the scour is set up, the relationship is used to control the scour depth in the model. The calculated scouring depth of matches with the experimental data very well, which proves numerical simulation of scour on river bed is reasonable and feasible under the condition of knowing the characteristic of river bed material. The calculated results show that aeration makes the depth of scouring become shallower, it is accordant to the experimental results.关键词：scouring;jet flow;numerical simulation
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发布时间：2023-11-28 - 摘要：Abstract:Quantitative assessment of watershed water resources security is very important for further increasing the sustainable utilization level of watershed water resources,optimizing the industrial structure,and releasing the conflict between supply and demand of water resources.On the basis of expert consult and water resources security investigation,the primary assessment index system of watershed water resources security is established,the index system is filtrated by the accelerating genetic algorithm based fuzzy analytic hierarchy process,and the final index system of watershed water resources security and its grading criterion are set up.A new method is presented to determine the relative membership degree function of variable fuzzy set of the assessed samples according criterion grades by using set pair analysis method,and a new quantitative assessment model of watershed water resources security, named SPA-QAM for short,is established by using fuzzy comprehensive evaluation method.The research result of SPA-QAM applied to Chaohu watershed shows the watershed lies in the critical security state,the population growth must further be controlled,the water saving agriculture technology must be spread,and the water consumption of unit agriculture production value must be reduced in order to further heighten the safeguard degree of the watershed water resources security.SPA-QAM mines fully the information of the relationship degree function between the assessed samples and the criterion grades,the evaluation results of SPA AM are reliable and possesses higher precision. SPA-QAM is visual,simple and general,and can be applied to different comprehensive assessment problems under the known grading evaluation criterion.关键词：management of watershed water security;water resources security assessment;assessment index system;set pair analysis;variable fuzzy set;Chaohu watershed
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发布时间：2023-11-28 - 摘要：Abstract:In order to study the classification and interrelation of soil physical and mechanical parameters,large numbers of soil samples under water were collected from the drilling holes in the foundation of Sutong bridge in lower reaches of Yangtze River.All sorts of geotechnical tests were conducted for the collected samples, and a variety of physical parameters and mechanical parameters were obtained. Based on synthetical analysis to all parameters, soil parameters were divided into testing parameters (including moisture capacity,void ration,density, standard penetration test (SPT)) and educing parameters (including modulus of compression, coefficient of compressibility,cohesion,angle of internal friction,plastic limit,liquid limit,plasticity index,liquidity index, resistivity, et al.).Through statistical regression analysis,regression curves, regression equations and correlativity coefficients between educing parameters and testing parameters were achieved. It is found that, firstly, there exists good exponential correlativity between modulus of compression, coefficient of compressibility and the testing parameters, the correlativity coefficient between modulus of compression and the testing parameters is from 0.8548 to 0.8701; the correlativity coefficient between coefficient of compressibility and SPT is 0.7338; the correlativity coefficient between coef ficient of compressibility and natural density, dry density, natural void ration and natural moisture capacity is 0.8982～0.9222.Secondly, there exists good exponential correlativity between liquidity index and SPT, the correlativity coefficient is 0.8557, the linear correlativity coefficient between liquidity index and other testing parameters is 0.9401～0.9596, and the linear correlativity coefficient between plastic limit and testing parameters is 0.74132～0.75901.Thirdly, the exponential correlativity coefficient between cohesion and testing parameters is 0.7158～0.7988, and the exponential correlativity coefficient between resistivity and testing parameters is 0.9358～0.9852. The following conclusions can be drawn that the confirmation of modulus of compression, coefficient of compressibility, cohesion, plastic limit, liquidity index and resistivity by the mathematic correlativity equations between educing parameters and testing parameters is an effective and practical method, and these regression formulae can offer important reference for the calculation and estimation of the parameters of soft soil in the lower reaches of Yangtze River and similar area.关键词：testing parameter;educing parameter;foundation soil under water;correlativity;tests
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发布时间：2023-11-28 - 摘要：Abstract:Based on the conditional expectation variance reduction, antithetic variable sampling and Neumann expansion technique,and in order to solve the problem of uncertainty of strength model partly,considering the different characteristics of uniaxial compressive strength σc and bidirectional isobaric strength σcc of concrete and rock materials, this paper applies 3 parameter unified strength theory to FEM program，and Monte Carlo 3 D nonlinear stochastic FEM model for structure reliability analysis is constructed. The result shows that this model has nice convergence, high efficiency, low cost and enough precision of index β for practice. The model is valuable for large-scale complex structure design and reliability analysis.关键词：structural reliability;Monte-Carlo stochastic finite element;conditional expectation variance reduction;antithetic variable sampling;Neumann expansion
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发布时间：2023-11-28 - 摘要：Abstract:Under the affect of water, slate features are charged, such as: physics, chemistry and mechanics, etc. It is a very complex process to water and rock interaction. And the quantify index that describes the process is still difficult to obtain.Aimed at the characteristic of water immersed collapse of slate, this article used the correlation fractal dimension of fractal theory to study the characteristic of collapse of slate and found the fractal model of collapse of slate. The fractal dimension of slate collapse is solved through quality. A series of fractal dimension values were obtained through collapse experiment. According to these values changing, the regularity that fractal dimension of slate collapse is changed with the water-immersed time increasing is obtained. This model was applied to solve the problem of water-immersed softening and collapsing of slate when constructing deep-long tunnel in west line of S-N water transfer project.关键词：slate;collapse;fragment;fractal
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发布时间：2023-11-28 - 摘要：Abstract:The hydraulic characteristics of the smooth spillway, the stepped spillway and the pre aerator stepped spillway have been studied respectively. By now the stepped spillway hasn't been applied successfully in instance project when the water head is very high and the unit discharge exceed to 50 m3/s.To overcome this problem,the pre-aerator is advanced which can not only keep the stepped spillway’s large energy dissipation ratio, but also protect the step from cavitation damage by controlling the aeration concentration of flow.Energy dissipation and erosion problems can be both solved by using the pre-aerator in a stepped spillway. The hydraulic characteristics induding energy dissipation and aeration effectiveness and anti-cavitation erosion are deeply analysed and studied. The achievements indicate that after optimizing the configuration of the aeration the step the energy dissipation ratio can reach to 70%.Although the pressure on the wall back the step can reach to -2.3 kPa, the measurement of the aeration concentration is bigger than 5% at the spillway step’s vertical surface. Compare to the stepped spillway, the pre-aerator stepped spillway has a better characteristics against the cavitation erosion and the energy dissipation ratio is 2~4 times higher than the smooth spillway.关键词：stepped spillway;pre-aerator;hydraulic characteristics;experimental investigation;air entrainment and cavitation erosion
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发布时间：2023-11-28 - 摘要：Abstract:Slope failures or even landslides are often triggered by improper excavation in high slope construction. Pre-embedded piles reinforce the slope before excavation. This method is a new way to protect high slopes from failure in cutting. In order to improve piles design in slope pre reinforcement, it is necessary to have a good understanding of the behaviour of piles in excavated slopes. The finite difference code FLAC3D is adopted to analysis the lateral soil pressure acted on the pre embedded piles. The numerical results is analyzed and compared with theoretical calculation results, it is shown that the lateral soil pressure on the piles is related with the soil properties and the stiffness of piles.关键词：pre-embedded pile;high cutting slope;interaction mechanism;numerical simulation
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发布时间：2023-11-28 - 摘要：Abstract:On the basis of Newmark-β method and superpasition principle, a new simplified numerical integration format for structural dynamics is deducted. The method is simple and convenient for elastic plastic seismic response analysis because its calculated displacement is independent of velocity and acceleration. The starting condition and stability of this numerical integration format are discussed. Theoretical analysis and numerical examples showed that accuracy is better and stability is worse if the coefficient β changed from 1/4 to 1/8.关键词：dynamic equations of structure;Newmark-β method;numerical integration
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发布时间：2023-11-28 - 摘要：Abstract:Uplift pressure is an important influence factor to the stability of gravity dam foundation. The method for simulating the uplift pressure in the model test on anti sliding stability of gravity dam is studied by mechanical analysis, theoretical derivation and numerical simulation. According to the loading property of gravity dam, a new test method for equivalent simulating uplift pressure by equivalent load and the calculation formulas of equivalent load are presented in this paper. In the research, similarity theory is used to deduce the similarity relations between the equivalent model and the actual model. Furthermore, a gravity dam on the homogeneous foundation is analyzed numerically. Through comparison between the structural characters of equivalent model and actual model, the equivalence and rationality of the equivalent simulation method are further verified. It is concluded that the equivalent simulating method for uplift pressure can be used in the model test on anti sliding stability of gravity dam.关键词：gravity dam;uplift pressure;equivalent simulation;similarity relation;equivalence
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发布时间：2023-11-28 - 摘要：Abstract:The geo-environmental factors are the fundamental factors that must be considered in the land use planning. Emphasizing the application of geo-environmental factors in land use planning and integrating regional geo-environmental settings and land use planning will ensure more rational and scientific planning. After a brief review of the status quo and lack of application of geo environmental factors in land use planning,the main features of Chengdu’s geological environment were analyzed and the relevant application of geo-environmental factors in the overall land use planning of Chengdu, including the planning of agriculture purpose and construction purpose lands were summarized.The importance and feasibility of applying geo environmental factors in effective land use planning was pointed ou关键词：geological environment;land use;planning
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发布时间：2023-11-28 - 摘要：Abstract:To study the load transfer mechanism, failure mode and vertical bearing capacity of a new-style composite pile formed by inserting a precast concrete pile into a cement mixing pile, in-situ tests of three full-scale composite piles were carried out and axial strains of piles were measured. Based on the experimental results, such as Q-S curves, S-logt curves, limit bearing capacity and axial strain, the distribution on axile force and side resistance of a composite pile, the distribution on side resistance along a composite pile and factors influencing the bearing capacity are analyzed. According to experimental and analytical results, load transfer mode that load is transferred from the precast concrete pile to cement soil and then from cement soil to soil around piles, is formed by inserting a precast concrete pile and the side resistance of a pile is effectively utilized under load. The main sources of high bearing capacity are the solidification effect of the cement soil, the pressing soil effect and the load transfer of the precast concrete pile. A composite pile has higher vertical bearing capacity and low cost, which are its advantage in application in soft ground.关键词：cement mixing pile;soft ground;composite pile;precast concrete pile;pressing soil effect
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发布时间：2023-11-28 - 摘要：Abstract:The relevant statistical properties including trends, periodicities, dependences, persistence and the consistent of low and high runoff of annual runoff for the main rivers in the upper reaches of Yangtze River, are discussed based on the stochastic analysis, wavelet analysis and set pair analysis. The results show that the annual runoff sequences in main rivers have outstanding treads, the different periodicities and the positive persistence structure, the periodicities are unequal in time, the auto correlation and cross correlation between the annual runoff sequences exist, and the spatial distribution of low runoff and high runoff is consistent.关键词：annual runoff;variation characteristics;stochastic analysis;wavelet analysis;set pair analysis
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发布时间：2023-11-28 - 摘要：Abstract:An experimental investigation on the flow boiling behaviors in a vertical rectangular micro-channel was conducted. The channel has dimensions of 0.54 mm×1.6 mm×330 mm (width×depth×length). The working fluid is deionized water. Experimental results reveal that the pressure drop increases with increasing mass flux and exit vapor quality. And the pressure drop is mainly contributed by friction part, while the influences of gravitation, acceleration and single phase flow on pressure drop are relatively small. Based on the experimental results, new frictional factor correlations for single phase flow are suggested. In addition, the experimental data of Tang (2007) and Hrnjak (2007) are well prediced by the new frictional factor correlations.关键词：microchannel;flow boiling;pressure drop
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发布时间：2023-11-28 - 摘要：Abstract:Water-holding and swelling properties of water-insoluble dietary fiber (IDF) from pomelo mesocarp were determined. The effects of adsorption time and temperature, cholesterol concentration, the content and the size of IDF on its adsorption to cholesterol were investigated. IDF from pomelo mesocarp showed good capabilities of holding water and swelling in water, their values being 19.12 g/g and 20.88 ml/g, respectively. IDF also demonstrated a high adsorption to cholesterol. The adsorption capacity achieved maximum during 90~120 min. A suitable cholesterol concentration for the adsorption was 1.2~1.5 mg/ml. The capacity for IDF to adsorb cholesterol gradually decreased with increasing IDF concentration. The size of IDF can markedly influence its absorption to cholesterol. IDF could adsorb more cholesterol at lower temperatures and its capacity of adsorbing cholesterol was 18.44 mg/g at 37 ℃. The adsorption of IDF to cholesterol could fit for Freundlich equation, indicating that IDF adsorb cholesterol physically and chemically.关键词：pomelo mesocarp;insoluble dietary fiber;cholesterol;adsorption
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发布时间：2023-11-28 - 摘要：Abstract:The preparation of vanillin with clove oil as the substrate and soybean lipoxygenase (SBLOX) as the bio-catalyst has been carried out in a silicon rubber membrane bioreactor (SRMBR). Compared with ferment in shaking flasks, the SRMBR system effectively prevented the product inhibition and oxidation of vanillin, owing to separation in situ through silicon rubber membrane. The bioconversion rate of clove oil was increased to 1.01% from 0.038%. By high performance liquid chromatography (HPLC) analysis, the vanillin concentration of the receiving solution in membrane down-stream reached up to 121.53 mg/L, which was much higher than the 8.14 mg/L in the broth of the shaking flask ferment, and the peak area ratio of vanillin in the receiving solution is 70.08%. By adding activated carbon as adsorbent into the broth, the bioconversion rate of clove oil was increased further to 1.14%, the vanillin concentration in the receiving solution reached 140.27 mg/L, and the peak area ratio of vanillin in the receiving solution has amounted to 93.53％.关键词：vanillin;SRMBR;clove oil;lipoxygenase;perstraction
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发布时间：2023-11-28 - 摘要：Abstract:The multi-walled carbon nanotubes (MWNTs) were purified by immersing in a 3∶1 mixture of concentrated H2SO4 and HNO3, and then were treated with ammonia and citric acid (CA), respectively. The structure and image of MWNTs were measured by Infrareed spectrum and electron microscopes. Furthermore, their dispersion properties in aqueous solution were studied. The spectrum results showed that there are many oxygenated functional groups on the surface of the MWNTs, and the amidocyanogen and CA molecules were introduced onto the surface of MWNTs. The results of dispersion experiment illuminated that the dispersion ability of MWNTs in aqueous solution was significantly improved by modification of CA.关键词：carbon nanotubes;modification;citric acid;dispersion property
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发布时间：2023-11-28 - 摘要：Abstract:In order to improve the Westinghouse Monopulse Secondary Surveillance Radar(MSSR) quality, a method which performed the multi-radar data fusion at first, and converted the fusion tracks into Westinghouse MSSR plot message format was presented. Some key technologies were researched, such as coordinate transforming, plot message format and output controlling. This method was confirmed at Guiyang airport air traffic control central， and the results showed that the Westinghouse radar data quality near the radar site and out of 200 nm were improved.关键词：air traffic management;Westinghouse MSSR;coordinate transforming;data fusion
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发布时间：2023-11-28 - 摘要：Abstract:In order to guarantee the radar data communication in the air traffic control system, a new HDLC protocol controller based on the FPGA parallel technology was presented. In terms of the HDLC frame structure and the theory of cyclic redundancy check,the implementation of the modules, constructing and deconstructing HDLC protocol frame, producing and checking the CRC code, and adopting the FPGA new technology were discussed. A new parallel high level data link controller (HDLC) was designed using the hardware description language on the FPGA device. The HDLC protocol controller can construct or deconstruct the multi-channel HDLC protocol frames in parallel way. As a result, it improved the robust and reliability of the whole system.关键词：HDLC;FPGA;CRC polynomial;HDL
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发布时间：2023-11-28 - 摘要：Abstract:To solve the problem that SAT solvers usually has excessive backtraces during assigning binary values to an unassigned variables, a new SAT solver based on symbolic simulation and variable partition, which lower not only the number of backtrack but the memory blow-up, was presented. The SAT solver partitions a big CNF into two smaller subset A and B, then divides the set of variables into three disjoint set. Through the constraint that the symbolic values are only assigned to the variable in the set which occur in both A and B, the symbolic simulation based SAT solver get both the low backtrack number and memory occupation. Experimental result showed the SAT solver is sound and efficient.关键词：SAT;symbolic simulation;CNF;variable partitions
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发布时间：2023-11-28 - 摘要：Abstract:Aiming at the deficiencies of current matching algorithm based on AIS (Artificial immune system), such as fault positive is high and the efficiency is very low, an improved evolution optimization with r-continuous bits matching rule was proposed. The concepts and formal definitions of immune cells were given, affinity accumulation process, and mature-lymphocyte lifecycle were presented. This new algorithm introduces evolution operator into the matching rule during the affinity accumulation process to improve the detection efficiency and overcome the shortcoming of the local optimum. Experimental results showed that the algorithm greatly enhances the response rate and the precision of detection, and the proposed model has the features of real-time processing, self-adaptively, thus providing a promising solution for intrusion detection.关键词：network security;artificial immune system;intrusion detection;matching algorithm
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发布时间：2023-11-28 - 摘要：Abstract:The fusion of real-time and fault tolerant is needed to solve the problem of dependability for the critical mission distributed system, and the real-time fault tolerant middleware was proposed. The difficult for the fusion of real-time and fault tolerant was analyzed,the idea and architecture of the real-time fault tolerant CORBA middleware was put forward, and then the service oriented, three-layer, and real-time fault tolerant middleware model, and it’s detailed design were presented, including the design of the component of the middle layer and the sever layer, admission test, task assignment algorithm and scheduling service, which provides a platform to deal with critical mission in distributed system.关键词：real-time fault tolerant;middleware;CORBA;scheduling service
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发布时间：2023-11-28 - 摘要：Abstract:To withstand the ARP attacks，an algorithm using an active technique to detect the ARP attacks was proposed. According to the algorithm，header of all ARP packets that the host receives and sends is detected ,and the ARP packets of Inconsistent Header are abandoned.Adopting the method of active detecting， the special packets are constructed using the address information in the receiving ARP packet and sent to the host whose authenticity is to be verified , and thus the ARP packet is rejected if the host can’t pass the authentication.In accordance with the rule of “receiving ARP reply after sending an ARP request”, the ARP reply without request is refused. The algorithm is faster and more reliable in detecting ARP attacks against the local host than other solutions against ARP attacks.Moreover, it can prevent local host from attacking other host and resists the ARP attacks more effectively.关键词：ARP attack;consistent detection;verifying the identity of the sender;active detecting
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发布时间：2023-11-28 - 摘要：Abstract:How to deal with the complex coupling between the inputs and outputs and the various uncertainties is crucial to the control of MIMO nonlinearly parameterized systems. A dynamical signal was used to characterize the unmodeled dynamics in the system, adaptive nonlinear damping was employed to dominate the effects of unknown parameters, nonlinear uncertainties, unknown bounded disturbances, unmodeled dynamics and the coupling between the inputs and outputs. Based on the Control Lyapunov Function method, a robust adaptive controller was designed for MIMO nonlinearly parameterized systems. The proposed control scheme does not need to estimate the unknown parameters. It was proved that with the proposed scheme, all the variables in the closed loop system are bounded and the mean-square tracking error can be made arbitrarily small by choosing some design constants appropriately. Simulation results illustrated the effectiveness of the proposed control scheme.关键词：nonlinearly parameterized systems;MIMO;adaptive control;unmodeled dynamics;robustness;stability
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发布时间：2023-11-28 - 摘要：Abstract:Subsynchronous oscillation is a serious stability problem that can exist in a power system. It can not only cause power oscillation in the system, but also cause shaft fatigue and possible damage or failure of the generator involved. Previous SSO analysis methods based on linear system equations had a lot of defects or were even impossible in engineering application. For these reasons,a prony identification method was developed to get the reduced order linear opened loop model of the complex hybrid HVDC/AC transmission systems. As comparison, both the transient torque simulation method and prony method were used to analysis 2008 Guizhou power system in the time and frequency domain. The analysis result shows that the certain operation conditions can cause Subsynchronous oscillation. With the method the characters of Subsynchronous oscillation of complex HVDC/AC transmission systems and large AC system with FACTS devices can be analyzed accurately.关键词：sub-synchronous oscillation;HVDC/AC transmission systems;prony identification method
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发布时间：2023-11-28 - 摘要：Abstract:In order to depict the symmetry degree of filter sequence quantificationally and furthermore propose some new quantitative characters of filter sequence,the symmetry of real discrete-time signals or real sequence in spatial domain was analyzed. Firstly, the generic conception of symmetry for a real sequence was proposed, and then, the symmetry decomposition and the symmetric degree sequence are presented, which are deduced from the projection theory, the orthogonal decomposition theory in inner product space and the characteristic of inner product which shows linear similarity degree between signals. The symmetric degree sequence showed that the symmetry of discrete time real signal changes with the shift of center symmetric point. Based on the symmetric degree sequence, the quantitative symmetric index of a discrete time real signal was deduced，and the quantificational analysis techniques of symmetry were given. Finally, the symmetry degree of the classical and the least asymmetrical Daubechies of scaling Low pass Filters sequence and High pass Filters sequence were analyzed. The results showed that the quantitative analysis is consistent with our intuitionistic instance. These symmetry indexes confirmed the symmetric characters of Daubechies Filters quantificationally.关键词：inner product space;symmetric degree sequence;symmetric index;Daubechies wavelets;symlets filter
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发布时间：2023-11-28 - 摘要：Abstract:Machine vision system must meet the requirements of real-time and stability. An effective method was proposed and applied to the machine vision system of reedswitche madding device to monitor the geometric parameters. The edge of the image is enhanced by the Curvelet transform for stability and the program is optimized by IPP functions for high speed.This system can process an image every 12 ms and its repeat accuracy is 4 μm. The application showed prove that the machine vision system of the reedswitche madding device can monitor the geometric parameters through stable and real-time processing by this method.关键词：reedswitche;machine vision system;fast Curvelet transform;IPP functions;stability
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发布时间：2023-11-28 - 摘要：Abstract:Based on the investigation of the existing problems in ultrasonic inspection of large cylindrical parts,an online and automatic ultrasonic testing system was developed to detect the inner flaws of lager cylindrical parts. The system includes a ultrasonic transducer and fixture equipment, a set of supplying and recycling couplants，a high speed transmitting and receiving ultrasonic A/D card based on PCI bus, a laptop computer fro factories, a software system , a location sensor and so on. The function of the system is to receive and process the ultrasonic signals, store testing data, and online analyze and recognize inner flaws. Through the application of the factory, the system is proved to be available for diagnosing the defects of the large cylindrical parts.关键词：ultrasonic testing;online testing;large cylindrical parts
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发布时间：2023-11-28 - 摘要：Abstract:To design and analyze 95% Chinese crash dummy, a method that base on human body mechanics and finite element analysis was used, and a 95% Chinese crash dummy was researched and manufactured. The result of test indicated that depending on the parameters of 95% Chinese adults and the flexible application of finite element analysis can realize the comparability of crash dummy about its structure and its mechanical character, and improve the character of its dynamic response. It can increase the efficiency of design and shorten the development period of dummy.关键词：human body mechanics;finite element analysis;crash dummy
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发布时间：2023-11-28
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