最新刊期
      卷 45 ， 期 5 ， 2013
      • Vol. 45, Issue 5, Pages: 1-7(2013) DOI: 10.15961/j.jsuese.2013.05.011
        摘要：Abstract:Based on the Gibbs free energy (GFE) theory, an indicator of “Free Energy Dissipation” Ω is proposed for thermodynamic accessment of route of CO2 emission reduction (CER). It is pointed out that the value of CER is to reduce the dissipation.A linear function relating power output and the dissipation is derived as,w=－(1/ε)·（Ω/α）=－(1/(1－β))·(Ω/α).where the parameters of ε,β,and αrepresent the ratio of GFE dissipation and reservation as well as the irreversibility. It is revealed, according to the analytic calculation with this function, that the 5.7% extra GFE dissipation will be added to CCS process then be loaded to the environment. Therefore CCS is not a favorable choice from thermodynamics point of view. Contrarily, originated from CO2Cycling Utilization, the route of CCU emphasizes converting GFE from industrial wastes into regenerated products, therefore realizes GFE recovery and reduces the environment load. So CCU is advantageous to CCS thermodynamically. It is demonstrated by a case investigation to a project in which 8×104 t/a of CO2will be mineralized by phosphogypsm, that CCU could be an economic profitable route of CER plus considerable resource and environment benefits.  
        关键词：CO;2;emission reduction;CCS;CCU;Gibbs free energy;dissipation   
        3245
        |
        4
        |
        5
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932099 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 8-12(2013) DOI: 10.15961/j.jsuese.2013.05.027
        摘要：Abstract:In order to investigate the capacity mechanism,failure mode and capacity elevated degree of stone-arch bridge,two groups of compressive specimens of stone masonry strengthened by injection high-performance cement composite concrete and one group of contrastive specimens were made for the axial compression test. The strengthening effects of the thickness of concrete on the strengthened stone masonry were analyzed. The experiment results showed that the cracking capacity of strengthened stone masonry can be greatly improved by 103.1%~119.8%,and the ultimate capacity can also be improved by 21.2%~36.4%.Strengthening stone-arch bridge with injection high-performance cement composite concrete is an effective method which can be employed to the strengthening engineering.  
        关键词：high-performance cement composite concrete;stone-arch bridge;Strengthening   
        2430
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43931621 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 13-18(2013) DOI: 10.15961/j.jsuese.2013.05.022
        摘要：Abstract:Based on the model introduced by Gardner,the responses of soil moisture under steady-state evaporation conditions from a shallow water table for 5 different soils in Europe were numerically studied.Numerical experiments results showed that the distributions of soil water content and logarithmic absolute value of soil suction down the soil profile have a single inflexion and double inflexions,respectively.Under the same groundwater table,the maximum surface evaporation rate has negative correlativity with clay content for different soils.Two-rank polynomial could be used for modeling the relation between maximum surface evaporation rate and groundwater table.When surface evaporation rate is between 0.01~0.1 cm/d,the corresponding values of the maximum groundwater table could be used for the evaluation of referenced value of critical water table.Results modeled for relative evaporation rate coefficient is analogical with those of surface evaporation rate coefficient in the experiment recorded in some reference.Results predicted by the model introduced by Gardner are correct and reliable,which indicated that the simple model could be used for the responses of soil moisture under steady-state evaporation conditions from a shallow water table.  
        关键词：evaporation;soil moisture;soil suction;soil water retention curve   
        2867
        |
        4
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43931664 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 19-23(2013) DOI: 10.15961/j.jsuese.2013.05.004
        摘要：Abstract:Based on the relationship between relavent forces acted on particles and the angle of repose at the condition of incipient motion,two pickup probability models were proposed for sediment entrainment under the normally distributed instaneous velocity and log-normally distributed instantaneous velocity, then two incipient velocity for nonuniform sediment models were derived. The results were compared with the published experimental data and field data and the results showed that the mechanism of incipient motion of gravel and cobble which are the main components of mountain river bed may be different from that of sand. The analysis showed that the results for the log-normal distribution reveal a significant improvement of accuracy for the mixtures with or without gravel and cobble.  
        关键词：incipient velocity;the angle of repose;non-uniform sediment;log-normal distribution;normal distribution   
        2463
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933738 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 24-28(2013) DOI: 10.15961/j.jsuese.2013.05.003
        摘要：Abstract:Using large-scale shearing device,isotropic consolidated-drained triaxial tests under different confining pressures were carried out for three relative density overburden materials of Shuangjiangkou earth dam.Based on the analysis of test and the relationship between shear dilatancy ratio and stress state,a new stress-dilatancy equation,which is available for coarse-grained soils, was set forward, and the mothed to determine the parameters of dilatancy equation was given through analyzing the relationship of the parameters of dilatancy equation and confining pressure.The new dilatancy equation reflected the relationship between the shear dilatancy ratio and current stress ratio and the relationship between failure stress ratio and confining pressure.Using the present dilatancy equation and Rowe’s dilatancy law,the triaxial compression test results of several kinds of coarse-grained soils were predicted. The results showed that the effect of simulating the dilatancy characteristics of coarse-grained soil by the present dilatancy equation is better than Rowe’s dilatancy law.  
        关键词：coarse-grained soil;large-scale triaxial test;dilatancy equation;stress   
        2517
        |
        2
        |
        4
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933595 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 29-33(2013) DOI: 10.15961/j.jsuese.2013.05.028
        摘要：Abstract:In order to identify the damage location and extent of the cantilever structure, a flexible damage identification method was proposed based on point spectral correlation function. According to the characteristics of the cantilever structure and the structural dynamic equation, the relational equation between the modal parameters and the structural member physical parameters was found by the transition of the flexibility matrix elements. Based on the free vibration signal of structure, the square root value of point spectrum correlation function was discussed and used as a replace of structure modal parameter. Then the damage equation of the square root value of point spectrum and the stiffness damage coefficient was established. The location and degree of single or multiple structure damage could be able to identify through solving the damage equation. This method has clear physical meaning and the unload excitation is easy to implement, and it could be helpful for applications without contrast test before and after damage. Finally, the effectiveness of the proposed method was verified through two numerical examples.  
        关键词：cantilever structure;correlation function;flexibility matrix;modal parameter;damage identification   
        2295
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932312 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 34-42(2013) DOI: 10.15961/j.jsuese.2013.05.005
        摘要：Abstract:The process of the hyperconcentrated flow of tributaries merges into the upper Yellow River as well as the deposition pattern in confluence was preliminarily studied through experiment. The results showed that the hyperconcentrated flow’s merging into the main stream caused higher backwater in the upstream of the junction and greater size of separation zone near the downstream junction corner.Strongly sediment diffusion and density current took place and moved upstream in the backwater area. The moving distance of the density current was a function of the main stream discharge and the momentum ratio of the tributary and mainstream flow. The deposition pattern in the channel displayed as three parts of a wedge-shaped sandbar with inverse slope in the upstream of the junction, a sandbar in the separation zone leaning the inner back,and a hole arrayed in the flow deflection area and high velocity area. The total incoming sediment of the tributary has great impact on the geometrical sizes of the sandbar which are well proportional to the total incoming sediment.  
        关键词：Yellow River;hyperconcentrated flood;confluence;sandbar;deposition pattern   
        2346
        |
        2
        |
        9
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43934164 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 43-50(2013) DOI: 10.15961/j.jsuese.2013.05.029
        摘要：Abstract:Special-section steel tube column filled with steel-reinforced is a new type heavy-load composite columns.To investigate the axial compression stability mechanical property of this component,seventeen slender L-section steel tube columns filled with steel-reinforced were tested.The primary test parameters were the slenderness ratios,section steel index and confinement index.The loading process was analyzed，the load-average longitudinal strain curves，load-deflection curves，ultimate bearing capacity of the specimens were tested，and the influences of parameters on the axial load behavior were studied.The experimental results showed that the main failure modes of specimens are steel tube buckling on the end of specimens.With the increase of slenderness ratios, the ultimate bearing capacity of the columns decreases.The section steel index and the confinement index are the key factors effecting the ultimate bearing capacity. Based on the conclusions of domestic and abroad codes,the formula about stability bearing capacity under axial compression of L-section steel tube columns filled with steel-reinforced concrete was deduced.The calculated values agreed well with the experimental results.  
        关键词：steel-reinforced concrete;concrete-filled steel tube;combination column;special-shaped column;middle long column   
        2711
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43931757 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 51-56(2013) DOI: 10.15961/j.jsuese.2013.05.012
        摘要：Abstract:In neuroimaging studies,subject’s identity can sometimes be recovered from volumetric brain MR images via three-dimensional surface reconstruction or volume rendering techniques and directly leads to the violation of privacy protection regulations in medical applications.To address these concerns,a novel method for facial de-identification was developed to automatically remove facial feature from multi-modality brain MR images.A multi-resolution hierarchical feature vector based matching framework was proposed and applied to accurately locate several facial feature-related key points in the 3D brain MR images.An optimal 3D plane which cut through these detected key points was estimated and used to remove facial voxels from MR images.Experiments were conducted to validate the usefulness and applicability of the proposed method.  
        关键词：magnetic resonance imaging;brain;point landmark;data-driven;facial feature;three-dimensional reconstruction   
        2266
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43934521 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 57-63(2013) DOI: 10.15961/j.jsuese.2013.05.013
        摘要：Abstract:It is a key problem to choose proper agents for forwarding opportunistic messages. In order to avoid the transmission limits caused by the characteristics mobility, active alternatively of nodes and dynamic changes of network topology in opportunistic networks,a data forwarding algorithm—SNOP(data forwarding algorithm based on the sociality of node in opportunistic networks) was proposed from the perspective of combining social network with opportunistic network. SNOP takes community, similarity between societies and activity of nodes in the network into consideration to choose the targeted agents. It calculates nodal sociality in offline mode and implements messages forwarding online to reach the goal of high efficiency and reliability. The experimental results on real-world datasets showed that compared with the existing algorithm of data transmission, SNOP has a higher delivery success ratio, smaller transmission delay and with lower network overhead.  
        关键词：opportunistic networks;social networks;community detection;data forwarding   
        3868
        |
        2
        |
        7
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933512 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 64-68(2013) DOI: 10.15961/j.jsuese.2013.05.001
        摘要：Abstract:According to the characteristics of urban road short-term traffic flow,one kind of short-term traffic flow forecast model named DSARIMA（double seasonal autoregressive integrated moving average model) was proposed,which can meet the requirements of predicting daily pattern and weekly pattern traffic flow in urban road based on the ARIMA （autoregressive integrated moving average model) model and SARIMA （seasonal autoregressive integrated moving average model) model.According to the characteristics of the traffic flow in weekdays and weekends in urban road,a forecast algorithm was given which use two methods to forecast traffic flow by ARIMA model,one forecast usingN1time quantum before the given time,the other forecast using the same time quantum ofN2days before the given time,and use improved BAYESIAN model to decide the powers of the two methods by calculating the difference of the forecast results and the real results.The final forecast results were the sum of the respective results of the two methods multiplied by its power.The results showed that the DSARIMA model has better stability and are more accurate than the ARIMA model or SARIMA model when applied to the short-term traffic flow forecast.  
        关键词：short-term traffic flow forecasting;ARIMA model;SARIMA model;BAYESIAN model;daily pattern;weekly pattern   
        2535
        |
        4
        |
        12
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43934239 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 69-75(2013) DOI: 10.15961/j.jsuese.2013.05.014
        摘要：Abstract:To solve the drifting problem of a varying target object during target tracking, an adaptive prior appearance model was presented. The hierarchical Dirichlet process evolutionary clustering model and online boosting learning were combined into a coherent framework. By taking the hierarchical Dirichlet process as prior distribution, the prior appearance knowledge could adapt to change over time. Further, the appearance model was smoothly constrained by the mixture proportion of a type of appearance cluster at each moment. To balance the classification error of appearance model and the cost for splitting the clusters, the multi-modal appearance model was automatically learned by the use of Bayesian posterior inference. Finally, based on the weighting factor of appearance clusters, the target object was discriminated by combining the outputs of appearance classifiers. The simulation results showed that the learned appearance model could robustly adapt to the appearance variations, as well as the tracking results with high accuracy.  
        关键词：appearance model;adaptive prior;hierarchical Dirichlet process;cluster analysis;classifier   
        2448
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43934569 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 76-79(2013) DOI: 10.15961/j.jsuese.2013.05.015
        摘要：Abstract:In order to securely and efficiently transmit the privacy information to authorized users’ set through the unsafe channel and avoid key escrow, a new type certificateless broadcast signcryption scheme was put forward by using the cryptographic techniques on conic curve.First, correction of the scheme was analyzed and then the scheme was proven to have the properties of stronger unforgeability and confidentiality by using the hard problems of large number factorization and discrete logarithm on conic curve. Finally, the efficiency of the scheme was analyzed. It was shown that it has the high efficiency in computation cost for signcryption and designcryption, which improves the efficiency of network operation.  
        关键词：signcryption;broadcast;certificateless;conic curve;integer ring   
        2253
        |
        2
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932651 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 80-87(2013) DOI: 10.15961/j.jsuese.2013.05.016
        摘要：Abstract:Functional modules play an important role in many molecular processes and functions. Many computational methods have been presented to detect protein functional modules from a protein-protein interaction network. However most of the available methods have failed to take into account the intrinsic biological organization and ignore the negative impact on the algorithms by high false positives. In order to resolve this problem, the protein-protein interaction (PPI) network was modeled as an uncertain graph which every protein-protein interaction endowed with a measure. Through the use of the uncertain data management technology, a novel approach based on the possible-world model was developed to detect functional modules. A subgraph was represented as a functional module with high cohesion between its subunits and low coupling between the subgraph and its neighbor subgraphs. The relationship between a node and a subgraph was described by introducing the concept of expected support degree. A comprehensive comparison among the existing seven algorithms and our algorithm was made. Experimental results indicated that this method performs significantly better the state-of-the-art methods and the discovered functional modules are statistically significant.  
        关键词：uncertain data;functional module;protein-protein interaction network;gene ontology annotation   
        2784
        |
        0
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933024 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 88-93(2013) DOI: 10.15961/j.jsuese.2013.05.002
        摘要：Abstract:Recent researches have presented that homogenous donation is a very important assumption in the spatial public-goods game (PGG).However,abundant real examples imply that donation diversity could be a very important mechanism impacting cooperation level in the PGG,in a more complicated way instead of simply promoting the cooperation density.A new PGG model involving donation diversity was presented under the context of complex networks.The model was based on Barabasi-Albert scale-free networks and effects of donation diversity can be examined. In a term of the PGG,individuals updated their strategies according to their social diversity.At the end of every term of the game,individuals counted their payoffs from every neighborhood (local payoffs) and overall payoffs,and then decided their donation to each neighborhood in the next term,according to the proportion of local payoffs to overall payoffs.Finally,the relationship among cooperation density,multiplication factor,social diversity and average degree was investigated.The simulation results suggested that the donation diversity can rapidly facilitate cooperation to a stable level. With bigger multiplication factor,donation diversity promoted the cooperation level better. It was mentionable that donation diversity can obviously decrease cooperation density’s sensitivity to social diversity.  
        关键词：complex networks;evolutionary game;public goods game;cooperation emergence   
        2156
        |
        4
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933634 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 94-102(2013) DOI: 10.15961/j.jsuese.2013.05.017
        摘要：Abstract:In order to deal with the management difficulty and low network availability of large-scale P2P VoD systems, a kind of popular P2P VoD system named QVOD was investigated. The architecture and peer-distributing protocol of the system were analyzed with reverse engineering technology. A model was proposed to determine the stop crawling condition. According to the model, a distributed crawler named QVOD_Crawler was developed. Active measurements were used in the experiment. The program size and the churn of the system were studied. The results showed that the number of the online users in the QVOD system remained with a constant daily viewing pattern.The churn ratio had the same trend with the number of online users. The peers in the QVOD systems were more patient than those in the PPLive VoD system and other P2P live streaming systems,and the peer-life time followed a power-law distribution when the peer-life time was smaller than 1 000 minutes. The experiment results could be used as an important basis for the management and optimization of large-scale P2P VoD systems.  
        关键词：peer to peer networks;QVOD;video on demand;measurement;user behavior   
        2675
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932983 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 103-108(2013) DOI: 10.15961/j.jsuese.2013.05.018
        摘要：Abstract:In order to improve the accuracy of distributed consensus algorithms under quantization communication, a modified probabilistic quantization distributed consensus algorithm was proposed based on the probabilistic quantization distributed consensus algorithm. In the proposed algorithm, states of nodes were updated by itself states and the probabilistic quantization values of the adjacent nodes. The convergence performance and the mean square error of the modified probabilistic quantization distributed consensus algorithm were analyzed and calculated. The results showed that the accuracy of modified probabilistic quantization distributed consensus algorithm is improved dramatically.  
        关键词：quantization communication;distributed consensus;probabilistic quantization   
        2490
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933834 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 109-111(2013) DOI: 10.15961/j.jsuese.2013.05.019
        摘要：Abstract:Parameter design of parallax barrier is one of the most important keys to design a one-dimensional integral imaging (1DII) display based on parallax barrier. To analyze the effect of aperture width on performance parameters in 1DII display, the relationship between the aperture width and viewing angle of a single slit was deduced and the calculation formula of the resolution was obtained through geometrical optics. According to elemental image crosstalk factor, the calculation formula of the viewing angle of the 1DII display based on parallax barrier was deduced. A prototype of the 1DII display based on parallax barrier was developed, and the experiment results showed that the resolution and the viewing angle of the 1DII display increase with the decrease of the aperture width of the parallax barrier. The conclusion provided a direction for the design of 1DII display based on parallax barrier.  
        关键词：integral imaging;aperture width;resolution;viewing angle   
        2028
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932420 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 112-116(2013) DOI: 10.15961/j.jsuese.2013.05.031
        摘要：Abstract:Aimed at the puzzle that the first-order load capacitance parameter is difficult to adjust smoothly and continuously, a sort of first-order equivalent circuit was designed to solve the problem. Based on the equivalence on the circuit external characteristics, by means of controlling pulse duty cycle of PWM, through adjusting the current and voltage of the active circuit continuously and smoothly, it could achieve a smooth and continuous adjustment of capacitance parameter. The first-order circuit equivalence was analyzed, and the error analysis showed that, with the increase of switching frequency, the error would be decreased gradually. The comparative study of simulation showed that under the condition of switching frequency being 100 kHz, the duty cycles would respectively be 20%, 50% and 80%, the maximum error respectively would be 1.598×10－3,2.49×10－3 and 1.588×10－3,and the equivalent curve is almost the same with the actual curve. The results also showed that it is feasible for designed first-order equivalent circuit, and it provides a new thought to make first-order load capacitance parameter to be adjusted smoothly and continuously.  
        关键词：first-order load;equivalent circuit;smooth adjustment of parameter;continuous adjusting online;PWM   
        2059
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43934058 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 117-122(2013) DOI: 10.15961/j.jsuese.2013.05.032
        摘要：Abstract:In order to investigate the premature failure of medium voltage cable terminations under PWM (pulse width modulated) voltages, the relationships between surface hot spot characteristics and electric field distribution were investigated. A pulse voltage generator was applied to a cable termination (stress grading termination). Also, a high frequency sinusoidal voltage generator was applied to the termination with the same frequency and voltage amplitude. Through the results of infrared thermal images, the distribution of surface temperature was analyzed for the cable termination at pulse and sinusoidal voltages. In addition, according to the analysis of transient electric field based on finite element simulation, the maximum values of electric field at pulse voltages in stress grading termination located in the two positions where semiconducting layer cut off and where connected to the ground potential were obtained. The hot spots were related to the maximum value of electric field strength. Since pulse voltages include high frequency components during the rapid rising process, enhanced electric field on the local area resulted in higher resistive heating. As a result, the temperature at pulse voltage was more than at sinusoidal voltage and multiple hot spots form on the surface of the termination.  
        关键词：cable termination;pulse voltage;resistive heating;hot-spot temperature rise;transient electric field   
        2573
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932690 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 123-129(2013) DOI: 10.15961/j.jsuese.2013.05.020
        摘要：Abstract:The mechanism of time-sharing and multi-target control for power system with multiple HVDC links was analyzed.Based on the proposed control scheme,the accelerating torque is decreased by multiple HVDC links power increment before the slip of monitored generator approaches zero,the unbalanced power is distributed reasonably after it,and the power oscillation is damped through proper HVDC modulation under HVDC block.The digital simulation of “San-Hua” power grid showed that the proposed control contributes to improving the first-swing stability and damping the subsequent power oscillation after the fault.  
        关键词：HVDC;time-sharing and multi-target control;damping control;transient stability   
        2341
        |
        0
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43931954 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 130-137(2013) DOI: 10.15961/j.jsuese.2013.05.026
        摘要：Abstract:In order to solve the tracking control problem of nonlinear Hamilton systems with uncertain parameters and external disturbances,a novel adaptive robust anti-windup control law based on dynamic inversion and extended state observer was proposed.A dynamic inversion method was introduced to control the nominal system,then a novel adaptive law based on projection algorithm was used to compensate uncertain parameters, and an extended state observer was used to estimate external disturbances.And a dynamic compensation block was added to improve system performance in the presence of saturation.The proposed control method was applied to a typical model in the domain of spacecraft attitude control problem,and simulation results proved the fine control performance and strong robustness of the proposed method.  
        关键词：uncertain hamilton systems;dynamic inversion;actuator saturation;extended state observer;attitude control   
        2703
        |
        0
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43931878 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 138-144(2013) DOI: 10.15961/j.jsuese.2013.05.025
        摘要：Abstract:A mechanism was proposed to explain the error of Coriolis mass flowmeter in testing different density.The results showed that the upper segment of tube in U shape had velocity gradient when torsion triggered by Coriolis force, thus produced an adverse torque to reduce time difference and finally created the negative calibration errors.The mathematical model was built to precisely calculate the magnitude of the effect caused by different density and other factors such as the dimension of sensor.A simplified way to choose the value of density for calculation was given due to the limit of calibration method and experiment condition.In addition, it was proved that the error was directly proportional to density, but not related to flowrate.The application of this theory could improve the accuracy grade of Coriolis mass flowmeter in measuring compressed natural gas(CNG) and pave the way to the correction algorithm in the future.  
        关键词：Coriolis mass flowmeter;density effect;torsion   
        2667
        |
        14
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932561 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 145-153(2013) DOI: 10.15961/j.jsuese.2013.05.024
        摘要：Abstract:Internal cavitation flow was numerically simulated in the ultra-supercritical steam trap by combining cavitation model and two-phase flow model and using the standard k-ε model.The occurrence and development of internal cavitation in the valve were predicted and internal cavitation flow of the valve was studied under these conditions of different openings, different inlet pressures,different angles of sealing surface.Meanwhile,the anti-cavitation of the trap was studied.The results showed that the cavitation flow is well predicted. With the increase of opening the cavitation appears at the valve seat,developing gradually,finally a large number of cavitation form at valve bottom near wall.With the rise of inlet pressure,the cavitation intensify.When the angle of sealing surface becomes 45 degree, cavitation at the valve seat becomes lowest.Installing three-stage sleeve can restrain the occurrence and development of cavitation effectively.  
        关键词：ultra-supercritical;steam trap;cavitation;CFD   
        2386
        |
        0
        |
        6
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933702 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 154-159(2013) DOI: 10.15961/j.jsuese.2013.05.008
        摘要：Abstract:In order to construct the high precision error compersation model,the topological relationship of machine kinematics was simplified and 59 independent error components were analyzed.Based on the rigid body kinematics with small error assumption,a new comprehensive error model with geometric error and thermal error was given.A new thermal error measurement method was proposed based on the thermal error analysis. Five-point method was used to measure the spindle thermal error. Six-point method was used to measure the feed axis thermal error.Considering error measurement point discrete and incomplete,with the variable weights GM(1,n),the thermal error model was proposed to pradict grey thermal error data.The experimental results showed that the spindle model error range was between 0~2 μm,and the feed axis model error range was between 0~12 μm. Theoretical prediction curves were consistent with the experimental results. A CNC real-time compensation software was developed with SIMEMS840D controller’s PMC program based on above error model. After the compensation, the machine tool error range was between 0~29 μm.  
        关键词：five-axis machine tool;multi-body dynamics;synthesis error compensation model;variable weights   
        2187
        |
        8
        |
        6
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43931834 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 160-165(2013) DOI: 10.15961/j.jsuese.2013.05.021
        摘要：Abstract:Pulsed jet can be used to increase gas production,improve the permeability in low permeability gas reservoirs and enhance the yield of wells.According to fluid mechanics, jet mechanics,boundary layer and large-eddy simulation computational theory, the method of large-eddy simulation and the experiment of PIV were used to calculate the influence of ratio before and after nozzles diameter and ratio of oscillation chamber length with before nozzle diameter to the performance of pulsed jet.The design criterion of self-excited oscillation nozzle was established based on the stimulation of LES and PIV experimental results,which the diameter ratio (d2/d1) of anterior nozzle to posterior nozzle is 1.2~1.3 and the chamber length/diameter ratio（L/d1）is 2.3~3.3.The conclusions can be used as a criterions in structure design and optimization of pulsed jet.  
        关键词：low permeability gas reservoirs;self-excited oscillation;pulsed jet;large-eddy simulation   
        2263
        |
        2
        |
        10
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932851 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 166-171(2013) DOI: 10.15961/j.jsuese.2013.05.030
        摘要：Abstract:The noise distribution and dissemination law were studied in sound field of the S series new airfoil horizontal axis wind turbine near wake by acoustic array. Using the vibration and noise testing software (B&K) of Denmark in wind tunnel opening section, the blade downstream noise of the S Series airfoil horizontal axis wind turbine were tested ensuring wind speed at the rate of 10 m/s and different tip speed ratios. The maximum sound power level (SPL) was obtained by analyzing spectra under different tip speed ratio of the same section of wind turbine downstream. The results showed that the noise distribution law of maximum sound pressure level emerged in turn three strong pressure fluctuation change regions from center to radius direction, which are the test center, the center vortex and the tip vortex. The sound pressure level in these three regions emerged as sharp peak. At different cross section of the same tip speed ratio, the noise dissemination variation of wind turbine near wake is that the region radius of center vortex and tip vortex increase and constant migrate along the x axis positive direction away from the test section of the wind turbine.  
        关键词：wind turbine;acoustic array;Noise;center vortex;tip vortex   
        2335
        |
        4
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933469 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 172-177(2013) DOI: 10.15961/j.jsuese.2013.05.007
        摘要：Abstract:According to Mannich reaction mechanism, octodecyl amine methyl rutin (RuC18) was synthesized by using microwave-assisted method and water-bath process, respectively. Rutin, octadecylamine and formaldehyde were used as raw material, and methanol as solvent. The effect of these two synthesis methods on reaction rate and productivity was investigated. In water-bath process, productivity can reach 11.2%, while mole ratio of rutin, octadecylamine and formaldehyde is 1∶2∶12, and pH value ranges from 4.2 to 4.5, and reaction temperature is 75 ℃. In microwave-assisted synthesis, the productivity is about 18.9% with the microwave power of 150 watts and reaction time of 8 minutes. RuC18 structure is detected by using FT-IR and nuclear magnetic resonance. It was found that the unimolecular substitution reaction occurs in C8 position of heterocyclic ring "A".  
        关键词：rutin;Mannich reaction;amphiphile;microwave-assisted synthesis   
        2138
        |
        2
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933164 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 177-184(2013) DOI: 10.15961/j.jsuese.2013.05.010
        摘要：Abstract:Three co-existing steroid estrogens of estrone (E1),17β-estradiol (E2) and 17α-ethinyl estradiol (EE2) were selected to simulate combined polluted aqueous system and UV(/H2O2/TiO2) was used to control coexisted micropollutants simultaneously.Results showed that degradation of each contaminant fitted first-order kinetic model,while different removal efficiencies of the three aimed compounds indicated competition degradation existed in mixed matrix.E1 could be effectively degraded even in single UV process with removal ratio of 93.9% after 30 min contact and took advantages in competition with reaction velocity constant of 0.065 min-1, E2 and EE2 had the similar and comparably lower degradation rate constant of 0.006 min-1.Compared with single UV,the addition of H2O2 and TiO2 could promote the removal efficiency and reaction rate constant apparently.Taken UV/H2O2 as typical investigated process, the influences of initial concentration,pH value,existence of cations and anions were evaluated for co-removal of steroid estrogens which showed no alternation on E1’s superior degradation.Higher initial concentration led to lower removal efficiency and reaction rate constant, low pH value could enhance degradation effect and reaction rate constant,cations had little influence on degradation and presence of anions had negative effect on degradation of E1,inhibition sequence was HCO3－＞SO42－＞CO32－＞NO3－,while for E2 and EE2 ,little influence was concluded.  
        关键词：drinking water treatment;steroid estrogen;estrone;17β-estradiol;17α-ethinyl estradiol;UV/H;O;2   
        2315
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933285 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 185-191(2013) DOI: 10.15961/j.jsuese.2013.05.009
        摘要：Abstract:The corrosion behavior of X80 pipeline steel in simulated Ku’erle soil solution was investigated by potentiodynamic polarization,electrochemical impedance spectroscopy (EIS) and mass loss measurement. The corrosion products and morphologies were observed by X-ray diffraction (XRD) and optical microscope (OM). The results showed that the longer the metal is in the solution,the higher the corrosion potential,and the thicker the corrosion products. However,the corrosion rate of weld joint decreases first and then increases. The corrosion rate of X80 steel and its weld joint slows down because of the protection from the corrosion product film of Fe3O4 of inner layer. After 30 days in the solution,cracks show on the metal due to the shelling down of the corrosion product film,which is good for the invasion of Cl-. It accelerates the corrosion of certain part. The corrosion of weld joint part is more than other part of the steel in the exactly same solution environment. This is due to the fact that there are different structures on the same pipeline steel,leading to higher energy of lattice distortion and activity and lower corrosion resistance.  
        关键词：X80 pipeline steel;weld joint;Ku’erle soil;corrosion behavior   
        1884
        |
        0
        |
        14
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43932817 false
        发布时间：2023-11-14
      • Vol. 45, Issue 5, Pages: 192-198(2013) DOI: 10.15961/j.jsuese.2013.05.006
        摘要：Abstract:The Co-doped TiO2 nano-powders were prepared by the sol-gel method, and their photocatalytic activities were measured by the degradation of phenol under different light resources(UV and visible). The structures of the powders were also studied through XRD, EFSEM, UV-DRS, and XPS, and the relationship between their structures and photocatalytic activities was analyzed. The results showed that a part of Co2+ions have doped into TiO2 lattice successfully and can promote the phase transformation from rutile to anatase, and the others have formed Co3O4 and loaded on the surface of the powder. Thep-njunction is probable to be formed between Co3O4 and TiO2. These two changes of the structures enhance the photocatalitic activity of the catalyst obviously and the photon excited wavelength of the Co-TiO2 powder is broadened to visible light region. When the Co2+doped concentration is 1.0% and the calcination temperature is 773 K, the content of anatase phase in Co-TiO2 reaches 70.6%, and the BET surface area is 28.4 m2/g, which represented the best catalytic activity in all samples. The degradation efficiency of phenol in 2 h is 97.7% under UV and 52.3% under visible light irradiation, respectively.  
        关键词：titanium dioxide;dope;photocatalysis;degradation   
        2965
        |
        0
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 43933336 false
        发布时间：2023-11-14
      0