最新刊期
卷 45 ， 期 4 ， 2013
- 摘要：Abstract:The problem of poor blasting effect and low efficiency is widespread in the excavation of large outwash accumulation, which has complex composition of particulate matter,different cementation characteristics and uneven spatial distribution.With the excavation of Xiazanri outwash accumulation in Liyuan hydropower station,the drill blasting excavation parameters and construction technology were researched based on the blasting crater theory analysis,indoor experiment,and field test.The results showed that the outwash accumulation could be classified into three levels of strong cementation,compact weak cementation,and weak cementation,based on its physical mechanical property and construction characteristic.The optimal resistance should be 2.5~3.5 m, the hole depth should be 2~3 m and the explosive consumption should be 0.3~0.35 kg/m3 for strong cemented outwash accumulation. The optimal resistance should be 3m or 4 m,the hole depth should be 3~4 m and the explosive consumption should be 0.28~0.3 kg/m3 for weakly cemented outwash accumulation.The blasting technology of using high air pressure drilling rig,φ70 cartridge,plane area multipoint blasting and shallow stair of 3~4 m was raised.The results applied well in the excavation of Xiazanri outwash accumulation and it could be used as a reference for the excavation construction of large outwash accumulation in the southwest.关键词：outwash accumulation;excavation;blasting crater theory;parameter optimization
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发布时间：2023-11-14 - 摘要：Abstract:The aeration capacity of the spillway tunnel with high speed flows was analyzed by model experiment from the macroscopic aspect.The results showed that the aeration capacity of the complement wind tunnel in the mid-gate chamber would not increase as the rate of flow increasing.The aeration capacity is related to the Froude number of the flow out of the gate.The aeration capacity which arises from the self-aerated flow increases as the Froude number increasing.When the water level of reservoir is constant,the air output of the tunnel increases to a critical value then decreases sharply along with the increase of the Froude number.When the radical gate is fully opened,the air output of the tunnel decreases as the Froude number increasing.The air concentration of the outflow increases with the increase of the Froude number.关键词：spillway tunnel;aeration capacity;ventilating shaft;air output;Froude number;air concentration
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发布时间：2023-11-14 - 摘要：Abstract:Taking multi-objective optimization of airfoil-shaped hydraulic structure based on NACA thickness distribution as objective，an optimization model was established based on Isight platform.In this model,airfoil parameterization was realized by Hicks-Henne Shaped function.Parameters were selected and optimized by multi-island genetic algorithm.Taking an airfoil-shaped measuring flume in the final stage of rectangular cannal which set on small plain irrigation area as example,constraint condition was determined by archetype conditions and hydraulic parameters.Multi-objective optimization model was established combining contraction-drag ratio δ and submergence degree S.The reliability and accuracy of Isight platform was verified by optimized results.Results showed that the coefficients δ and S increase by 10.84% and 42.10% compared with the initial structure.Therefore,this research would provide recommendation for optimization of airfoil-shaped hydraulic structure and its application in irrigation system.关键词：Hicks-Henne shaped function;multi-island genetic algorithm;airfoil-shaped;multi-objective optimization;canal water gauging
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发布时间：2023-11-14 - 摘要：Abstract:optimal pouring scheme selection (OPSS) is a multi-attribute decision making problem under uncertain circumstances.However,evaluation indexes for the OPSS can be fuzzy and gray.In order to improve the objectivity and credibility of the index weight,a prospect value function and an improved grey target model were introduced to describe the risk preference for decision-making.This model established positive and negative standard model by selecting the ideal optimization scheme and the ideal inferior scheme as its reference points for positive clout and the negative clout.Based on the standard modeling,a gray target transformation was performed for the calculation of grey bull’s-eye coefficient and the establishment of value-index matrix.Weight vector was calculated in the model as the maximum of comprehensive prospect value of the concrete pouring schemes.Finally,the feasibility and effectiveness of the present model were verified by a real project case,and multiple concrete pouring placement schemes were ranked automatically by the model.关键词：concrete construction;scheme optimization;prospect theory;grey target theory;multi-attribute decision making
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发布时间：2023-11-14 - 摘要：Abstract:A serial of fire tests were conducted to study the fire resistance of the post-installed rebar connection with organic and inorganic adhesive. Two factors of the anchorage depth and types of anchorage glue were considered in the tests. Loads were applied through lever and remained constant throughout the whole process of the tests. The temperatures of connections were elevated following the ISO834 curve and the failure was controlled by excessive deflection of post-installed rebar beams. The test showed that anchorage depth and types of anchorage glue have a great effect to the performance of the reinforced beams under fire. Beams using organic adhesive fails suddenly with obvious rebar slip, and behaves with poor fire endurance, meanwhile using inorganic adhesive, the failure mode of flexural members under fire is the same as that of the general RC beams.关键词：High temperature;post-installed rebar;inorganic adhesive;anchorage depth
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发布时间：2023-11-14 - 摘要：Abstract:In view of the temperature fields’ simulation analysis on the full dam progress, a dynamic forecasting model of the casting warehouse during the middle-late cooling period was established, by combining the concrete average thermometer formula of the pipe cooling without heat source with the measured temperature to dynamically updating the Tiin the formula, and predicting the cooling process line of the casting warehouse. The analysis of a case showed that adopting that formula and combining the currently pouring temperature can make a dynamic forecast about the temperature of the future 7 to 10 days, and can provide an immediately reference for the intelligent control of the pouring deck’s water cooling in the later time.关键词：temperature predict model;middle-late cooling;concrete dam;dynamic forecasting model
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发布时间：2023-11-14 - 摘要：Abstract:In order to understand the stratum deformation rule of loess road tunnel under the influence of double-hole effect more comprehensively,four groups of model tests were carried out systematically with the centrifuge model test device, based on the thinking of first loading and then punching, and the influence of different double-hole clear distances on the stratum deformation of the loess road tunnel was researched.The test results showed that with the increase of double-hole spacing, the degree of the mutual influence between two holes will recede,and the stratum deformation curve close to the vault changes from single peak “V” shape to double peak “W” shape gradually.There exists the pressure arch effect,and the formation height of the pressure arch increase with the increase of double-hole clear distance.The sedimentation range and the sedimentation value of each layer of the anterior hole are larger than those of the subsequent hole, and the influence degree of the anterior hole on the subsequent tunnel will recede gradually with the increase of double-hole spacing. Selecting 0.5Dspacing form,the stress and deformation influence area between holes forms easily,so it’s necessary to reinforce the middle soil; selecting D spacing form and above,the steady wide-base bearing soil column between holes can form,so the reasonable spacing between two holes of closely spacing loess road tunnel can be D.关键词：loess tunnel;double-hole effect;stratum deformation;model test
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发布时间：2023-11-14 - 摘要：Abstract:In order to investigate the moment-rotation relation of the UHV angle steel tower K-joints, five full-scale tests were conducted. The results showed that the joints of this kind will reach their ultimate moment because of the shear break of bolts that connect the main angle and joint plate. Parameter analysis showed that the bolt number has great influence on ultimate moment and initial rotational stiffness when the other conditions are the same and the range of shape coefficient is 1.97 to 2.10 with the most concentrated in the vicinity of 2. Fitting formula of each parameter was given. Comparison showed that the Kishi-Chen three-parameter power model can predict the moment-rotation relation accurately.关键词：angle steel tower K-joints;semi-rigid;Kishi-Chen model
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发布时间：2023-11-14 - 摘要：Abstract:The eastern section of Chengdu Metro Line 2 project is 13.30 km,and has 11 stations and 12 interval tunnel engineering.Its geological conditions,hydrology geological conditions and the surrounding environment are very complex.According to the natural topography,lithology,regional geological structure,and stability of the geotechnical characteristics of the eastern section of the project of No.2 Chengdu Metro Line,comprehensive investigation and comprehensive analysis on geotechnical engineering characteristics were conducted,especially on geotechnical engineering characteristics of the Minjiang River system I and II order level.Finally,engineering advices were provided and applied in the scientific planning and construction of the subway project design for No.2 Chengdu Metro Line.关键词：No.2 Chengdu Metro Line;geotechnical investigation;geotechnical engineering
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发布时间：2023-11-14 - 摘要：Abstract:In order to research the dynamic property of the remoulded red clay under small shear strain amplitude condition,through imposing torsional vibration and changing the driving frequency step by step on the soil column with certain humidity, density and stress conditions, the resonant frequencies of the soil sample were measured.Then by cutting off the driving force, the vibration reduction curves were measured.The test can obtain the variation rules and influence factors of the dynamic shear modulus and damping ratio of the remoulded red clay under small strain condition. The results showed that the dynamic shear modulus of the remoulded red clay is relatively bigger, therefore its ability to resist deformation is relatively stronger. When the dynamic shear strain is small than 1×10-4,the dynamic shear modulus reduce slowly, but when the dynamic shear strain is more than 1×10-4, the dynamic shear modulus reduce rapidly.The damping ratio of the remoulded red clay is relatively smaller,so the stress wave can transfer faster and deeper in the soil and its energy reduction is slower.By using the improved Davidenkov model, the dynamic indexes of the remoulded red clay are fitted and the effect is pretty good.关键词：red clay;dynamic shear modulus;dynamic damping ratio;resonant column test
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发布时间：2023-11-14 - 摘要：Abstract:In order to investigate the building floor’s twist and the frame column’s axial force due to shield tunnelling adjacent an existing multistory frame structure building,several typical sensitive factors were analyzed through the 3D FEM by considering the interaction of the shield tunnel, heterogeneous soil and existing building.The result showed that the stress concentration caused by shield tunnelling appears just at beam-column joints of the building corner, and the tunnelling-induced ground settlement will be restricted by the surrounding existing building.The clockwise rotation of the left-side building floor is caused by shield tunnelling.Before the tunnel excavation face promotes to the transverse centerline of the building, the twist of the building floor increases,while the axial force of the frame column decreases.However, the opposite results were calculated as the shield driving.The analytical results can be used to better assess building responses to tunnel excavation induced ground settlement.关键词：shield tunnel;existing building;interaction;3D FEM;sensitive factor;twist;axial force
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发布时间：2023-11-14 - 摘要：Abstract:Ms7.0 giant earthquake took placed in Lushan County, Ya’an City at 8:02,April 20,2013, and according to field investigation, the most of secondary mountain disasters were collapses with small and median scale volume.Five principal types of secondary mountain disasters consisting of conglomerate collapses,sandstone collapses,carbonate stone collapses,landslides and long run-out landslide-avalanche were proposed and the characteristics,mechanism and influence factors were analyzed.The regional geological environment and structure were regarded as the primary elements through preliminary analysis, and the large amount of loosen materials were easy for occurring debris flows and landslides triggering by the storm and continuous rainfall, which will seriously threat the reconstruction and lives in the rainy season for decades,therefore the post-earthquake effect as well as the monitoring and pre-warning strategy should be carried out in meizoseismal area and especially in reconstruction settlements.关键词：Lushan Earthquake;secondary mountain hazards;features;mechanism
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发布时间：2023-11-14 - 摘要：Abstract:In order to improve the performances and work reliability of the multi-layer interference connection parts,based on traditional design methods,an improved design method was given.In accordance with the order from the inside to the outside,thick-wall cylinder theory and the Lame equation were used to calculate the pressure and interference fit amount of spindle-to-bushing contact surface.The checking method of the bushing was used to calculate the bushing-to-inner ring contact surface,and the inner-ring stress analysis method was used to calculate the inner-to-outer ring contact surface.Compared with traditional design method,the proposed method fully takes into the consideration of the influences of various design parameters,and the calculated results coincide with the actual simulation results,the error is smaller and the accuracy is higher.Ultimately,the test was also designed to verify whether the shrink disk could bear the load or not during the actual operation, and the results showed that it could meet the requirements of given loadcase.关键词：multi-layer interference fit;design method;shrink disk;FEM
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发布时间：2023-11-14 - 摘要：Abstract:To satisfy the requirements of distributing the dynamic stiffness of machine tool joints,an optimization design method for dynamic stiffness of machine tool joints based on the theory of modal flexibility was proposed.Weak modes that had significant effects on dynamic characteristics of the machine tool were judged according to modal flexibility coefficients of those modes. The multi-objective optimization mathematical model was established,with the minimum modal flexibility of the weak modes being the objective functions.To increase the efficiency of optimum calculations，the orthogonal experiment design and the grey relational analysis(GRA) method were introduced.Taking a precision horizontal machining center as example,the method was applied to the dynamic stiffness optmization design of the linear guide,ball screw,and bolt joints of the column-spindle system.The linear guide joint in the X-axial direction was identified that it has the most significant influence on dynamic characteristics of the machine tool.The best solution of dynamic stiffness of joints was obtained.The effectiveness and engineering practicability of the proposed method were verified by the results of numerical simulation and experiments.关键词：modal flexibility;joints;dynamic stiffness;orthogonal experiment;grey relational analysis;multi-objective optimization
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发布时间：2023-11-14 - 摘要：Abstract:Aiming at the problem that the accuracy of remaining thickness of the field signature method (FSM) is ±(10%~15%) of the wall thickness in pit corrosion and should be modified by empirical coefficient,a new method was proposed to calculate the remaining thickness in FSM using the mathematical model of resistor network, which was based on the analysis of change of current field in monitoring area. The corrosion of pipe can be equivalent to the change of resistor between probes, and a single resistor network can be determined by the distance and amount of probes in monitoring area of pipe. The current of resistor can be calculated before and after corrosion with Kirchhoff’s law. The function relation of resistor before and after corrosion is established,and the formula of remaining thickness in high accuracy is obtained after the factor of change of current field is eliminated. The simulation in finite element analysis software and experiment results showed that the new algorithm of remaining thickness of pit corrosion is much higher than the algorithm commonly used at present in accuracy, and don’t need to modify by empirical coefficient, which showed that the efficiency calculation method is practical.关键词：non-destructive testing;pipe corrosion;field signature method;corrosion monitoring;remaining thickness
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发布时间：2023-11-14 - 摘要：Abstract:The weaknesses of usage control (UCON) model was pointed out,and the context was introduced to replace a generalized system and the environment in UCON to extend it into a contextual usage control(CUC) model.The management function was also introduced,enabling management and control to some extent together.CUC’s architecture includes two major functional blocks,one called as management block for the management of attributes of subjects,objects and contexts,and the other called as control block for access control itself.There is loosely couple between the two functional blocks.After the conceptual description of CUC,an algebra approach was used for formal description of CUC syntax and semantics.关键词：information security;access control;UCON (usage control);context
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发布时间：2023-11-14 - 摘要：Abstract:Certificate-based Cryptosystem is the latest evolution of traditional public key cryptosystem, but most of existing certificate-based signature schemes were constructed by pairings, which led to low calculation efficiency. Based on discrete logarithm problem, a certificate-based blind signature scheme without pairings was presented. The new scheme had higher efficiency, as it was mainly based on modular exponentiation arithmetic in the finite field instead of pairings and messages were blinded by affine transformation. The validities of public key and certificate were verified before verifying signature, so the mutual authentication of both public key and certificate was achieved. Under the random oracle model, it was proved that the scheme was blind and existentially unforgeable against user forgery attack, CA forgery attack and public key replacing attack. Efficiency analysis showed that, compared with other similar schemes, the proposed scheme had shorter signature length, smaller computation and communication complexity, so it was suitable for application fields of lower computing power and limited bandwidth.关键词：certificate-based cryptosystems;blind signature;bilinear pairing;discrete logarithm problem
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发布时间：2023-11-14 - 摘要：Abstract:In order to solve the performance problems of existing P2P live streaming system in the dynamic environment, such as considerable startup delay, the node startup process was modeled to analyze the key factors, which had effects on node startup process performance. From the view of data scheduling, a node status adaptive startup strategy (NSAS) was proposed. This strategy improved three major processes of node startup process, which were selecting the startup request point, data scheduling, and playing strategy, so as to reduce the resource waste in startup process, accelerate nodes obtaining chunks and improve start playing conditions. Simulation results showed that this strategy can improve the system adaptability to dynamic environment and data distribution efficiency, and reduce the startup delay and playback lag.关键词：peer to peer (P2P) networks;streaming;delay;scheduling;startup process
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发布时间：2023-11-14 - 摘要：Abstract:Most current privacy-reserving located-based service (LBS) techniques have proved to be quivering in the balance with the levels of privacy protection and communication overhead. In order to address these challenges, an adaptive collaborative privacy-preserving technique was introduced in which mobile user firstly achieves his location context based on the downloaded rough topology maps from LBS provider's server while user consume services, then regionalizes his original position and selects a collaborative proxy user for adaptive context-aware incremental nearest-neighbor querying. Meanwhile, in order to improve the QoS (quality-of-service) of system, the query-anchor was determined by communication cost-estimation method and POIs(points of interest) were filtered by on proxy user,which eliminate communication overhead of whole service process. Theoretical analysis and experimental results validated the technique’s effectiveness on LBS accuracy, privacy protection and communication QoS compared with SpaceTwist.关键词：located based service;privacy protection;location privacy;adaptive context-aware
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发布时间：2023-11-14 - 摘要：Abstract:In order to resolve the improper calculation method, an improvement on calculating interestingness was proposed by considering classified situations.Multiple templates were induced, which support multi-dimension analysis and enrich user’s implications. With two groups of contrast experiments, the new algorithm produced more reasonable sorting result of interestingness, and supplied users with more valuable rules.关键词：association rules;optimization;template matching;interestingness
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发布时间：2023-11-14 - 摘要：Abstract:By simulating the process of human thinking,a solving method for multi-attribute group decision making problem based on granular computing was proposed. Firstly, mathematical description of granular computing structure model was discussed. Secondly, in order to give a fine description to single decision maker’s thought at different granular layers, granular information entropy measurement under relative meaning was given. Through definitions of matching rate and coverage rate under granular divisions, the optimization of granular layer based on similar threshold was carried out, and the final optimization result, which indicates single decision maker’s decision thought, was exhibited by weight values of feature attributes. Thirdly, based on values of weight vectors which indicate decision makers’ decision thought upon different granular layers, the nonlinear optimization model was built up to rebalance all decision makers’ opinions at different granular layers and get the final optimal weight values of feature attributes, which can be recognized by all decision makers. Thus, an integrated and qualitative problem solving environment for multi-attribute group decision making was reached. Lastly, a graduate student admission interview assessment example was given to prove its feasibility and superiority.关键词：granular computing;granular layer;weight;multi-attribute group decision making;human thinking
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发布时间：2023-11-14 - 摘要：Abstract:In order to solve the distributive adaptive packet data transmission issue in cognitive radio network,a novel spectrum selection algorithm based on queueing game was proposed.The data transmission problem was modeled as a potential game of spectrum selection.Considering the influence of delay caused by primary user,the utility function was built based on queueing game.Each second user autonomously adjusted the spectrum choose strategy to get the spectrum allocation and cross-layer optimize the transmission delay and the average packet loss rate.Simulations and analysis showed that this proposed algorithm could reduce average end-to-end delay and average packet loss rate effectively,and converge to strategy equilibrium point more quickly with smaller complexity.关键词：cognitive radio;game theory;queueing theory
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发布时间：2023-11-14 - 摘要：Abstract:In order to overcome the disadvantage of traditional method such as poor noise immunity,excessive loss of information and low information utilization,a cross information fusion method based on iteration was proposed to improve frequency estimation accuracy.In this method,a frequency range was determined roughly by phase relationship,and cross information fusion spectra were obtained via fusing the multistage signals in this range.According to the relationship of the aforementioned spectra and single-stage signal spectra,new cross information fusion spectra were gained by iteration.Furthermore,frequency estimator was achieved by means of the arithmetic mean value of the new cross information fusion spectra.Simulation result showed that compared to the existing methods,the proposed method was superior in precision,noise immunity and robustness.关键词：frequency estimation;cross information fusion;fusion spectrum;iteration;average spectrum
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发布时间：2023-11-14 - 摘要：Abstract:The concentric relaxation phenomenon of the average power dissipation distribution was proposed in order to locate the source of power system forced oscillations fast and exactly.During the constant amplitude oscillation stage,the frequency deviations and power deviations were represented with phasors.Then two criterion of the distribution of average damped energy were deduced,in which the total power dissipation injected into a node is zero, and this power at the beginning and the end of a branch is nearly equal.The concentric relaxation pattern of average power dissipation distribution was inferred due to the radial structure of power grid.This pattern was verified by a simulation of 10-generator 39-bus system.The concentric relaxation pattern is helpful for drawing up a scheme for fast locating disturbing source of forced oscillation and avoiding the erroneous judgment.关键词：forced oscillations;energy function;average power dissipation;concentric relaxation
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发布时间：2023-11-14 - 摘要：Abstract:The effects of heat pretreatment in cultured hydrogen-producing granular sludge was studied in upflow anaerobic sludge bed (UASB) reactor.Using a kind of mud and the thermal pretreatment of sludge as seeds,and under the conditions of the influent COD concentration 4 000 mg/L,the temperature 37 ℃,the effluent pH 4.6 ~ 5.0,HRT decreased from 24 h to 7 h,both reactor successfully cultivated mature granular sludge at HRT8 ~ 7 h.At this time,the organic load of the original sludge inoculation group is 45 kg(COD)/（m3· d）,gas production is 41 L/d,hydrogen content is 52%,COD removal rate is 23%,total volatile acids is 1 380 mg/L,the organic load of the heat pretreatment group is 57 kg(COD)/(m3· d),gas production is 44.5 L/d,hydrogen content is 47.5%,COD removal rate is 12%,total volatile acids is 1 086 mg/L.The results showed that,the thermal pretreatment has a significant effect on the formation and stability of hydrogen-producing granular sludge,while in the process of the granular sludge formation,it's poor stability and easy to float,but after start-up,the running state is more stable,can adapt to a shorter HRT and got higher hydrogen yield.关键词：hydrogen producing granular sludge;heat pretreatment;UASB
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发布时间：2023-11-14 - 摘要：Abstract:Strain GCN019 with high ability to degrade beta-cypermethrin was isolated from garden soil which contaminated by beta-cypermethrin for a long term.The strain was identified as Pseudomonas fluorescens based on the results from its physiological-biochemical characteristics and phylogenetic similarity of 16S rDNA gene sequences.Then,the main factors influencing beta-cypermethrin degradation were investigated by using Plackett-Burman design,and the degradation condition was optimized with response surface methodology.It was found that beta-cypermethrin concentration,inoculum volume and initial pH value were the major factors influencing beta-cypermethrin degradation.In addition,the degradation rate of beta-cypermethrin under the optimized condition reached 73.94%,which was similar to the predictive value from response surface model(74.30%).关键词：beta-cypermethrin;biodegradation;pseudomonas fluorescens;condition optimization
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发布时间：2023-11-14 - 摘要：Abstract:Affinity capillary electrophoresis was employed to study the interaction between tabersonine(TAB) and bovine serum albumin (BSA). The results showed that the binding constant is 8.00×106L·mol-1 under normal temperature. The thermodynamic parameters indicated that the interaction between tabersonine and BSA was driven mainly by hydrophobic interaction and van der Waals forces. The secondary structure of BSA was changed in the presence of TAB according to the FT-IR results. It was shown that TAB reduced α-helix, β-turn and increased β-sheet. At the molecular level, the binding mode of TAB and BSA was determined by molecular modeling method.
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发布时间：2023-11-14 - 摘要：Abstract:Slow strain rate tests were conducted in deaerated NS4 solution to research the behavior of stress corrosion cracking of X100 pipeline steels at different applied cathode potential. The results showed that the susceptibility of near-neutral pH stress corrosion cracking(NNpH-SCC) does not increase obviously at -900 mV SCE than that at open circuit potential. However, the NNpH-SCC susceptibility increases distinctly at -1 500 mV SCE than that at open circuit potential. The NNpH-SCC susceptibility at applied cathode potential were contrasted between X100 and X80 pipeline steel, which revealed that the NNpH-SCC susceptibility influenced by applied cathode potential of X80 pipeline steel is stronger than that of X100 pipeline steel.关键词：X100 pipeline steel;applied cathode potential;NNpH-SCC susceptibility;slow strain rate tests
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发布时间：2023-11-14 - 摘要：Abstract:The rheological properties of plastisols prepared by different PVC resins were evaluated using a DV-79+ pro coaxial cylinder viscometer by steady shearing.The effect of resin characteristics on the rheological properties of PVC plastisols was investigated.The results indicated that the flow property of plastisols is determined by the preparation process,the particle size,and the distribution of resins.The dependence of viscosity on temperature was determined by the particle distribution of resins,and the result showed that the viscosity of plastisols prepared by resins with bimodal particle distribution is more sensitive to temperature than that of plastisols prepared by resins with unimodal particle distribution,the plastisols prepared by bimodal particle distribution resins prefers to gel.The viscosity of plastisols showed less dependence on shearing rate with the temperature increasing,and the plastiols showed a trend to change into Newtonian liquid.关键词：PVC;plastisol;rheological property;resin characteristic
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发布时间：2023-11-14
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