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重庆大学学报（英文版）

重庆大学学报（英文版）

Journal of Chongqing University(English Edition)
  • 发文量：865
  • 被引量：15
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  • 国内刊号/CN：50-1142/N
    国际刊号/ISSN：1671-8224
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  • 主管单位：国家教育部
    主办单位：重庆大学
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  • 主编：李晓红
  • 电话：023-65112204
  • 邮箱：xbyw@cqu.edu.cn
  • 地址：重庆市沙坪坝沙正街174号重庆大学A区
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重庆大学学报（英文版） >2018年第4期
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  • 摘要：Based on the theories of three-dimensional elasticity and piezoelectricity, and by assuming appropriate boundary functions, we established a state equation of piezoelectric cylindrical shells. By using the transfer matrix method, we presented an analytical solution that satisfies all the arbitrary boundary conditions at boundary edges, as well as on upper and bottom surfaces. Our solution takes into account all the independent elastic and piezoelectric constants for a piezoelectric orthotropy, and satisfies continuity conditions between plies of the laminates. The principle of the present method and corresponding results can be widely used in many engineering fields and be applied to assess the effectiveness of various approximate and numerical models.
  • 摘要：Fast response and stable torque output are crucial to the performance of electric screw presses. This paper describes the design of a direct torque control （DTC） system for speeding up torque response and reducing the starting current of electric screw presses and its application to the J58K series of numerical control electric screw presses with a dual-motor drive. The DTC drive system encompasses speed control, torque reference control, and switching frequency control. Comparison of the DTC dual-AC induction motor drive with corresponding AC servo motor drive showed that for the J58K-315 electric screw press, the DTC drive system attains a higher maximum speed （786 r/min） within a shorter time （1.13 s） during a 250 mm stroke and undergoes smaller rise in temperature （42.0 °C） in the motor after running for 2 h at a 12 min-1 strike frequency than the AC servo motor drive does （751 r/min within 1.19 s, and 50.6 °C rise）. Moreover, the DTC AC induction motor drive, with no need for a tachometer or position encoder to feed back the speed or position of the motor shaft, enjoys increased reliability in a strong-shock work environment.
  • 摘要：To prolong the life-span of crush hammers in the pyrite concentrate workplace of Ganbazi Coal Preparation Plant of Chongqing Nantong Mining Ltd., we used a progressive damage constitutive model based on the ductile and shear damage fracture energy to analyze the hammer wear failure caused by the impact and abrasion on the hammer surface by pyrite, and carried out simulation analysis with the explicit algorithm on hammer leftovers from the plant during the process of coarser pyrite comminution. The simulation results are consistent with hammer wear failure caused by pyrite impact. Then we proposed corrective measures to prolong hammer life-span. Results of the production test in the Ganbazi Coal Preparation Plant showed that non-clearance hammers can avoid wear erosion, and adding steel bonded tungsten carbides F3002 prolonged the hammer lifespan. The effect of austenitic manganese steel work-hardening was not prominent. Therefore, the hammer failure was mainly caused by superficial abrasion instead of fatigue cracks appearing when grains acted on the hardening layer.
  • 摘要：We investigated wind-induced vibration control of long-span power transmission towers based on a case study of the Jingdongnan-Nanyang-Jingmen 1 000 kV transmission line project in P. R. China. The height of the cup tower is 181 m with a ground elevation of 47 m, which makes it a super flexible and wind-sensitive structure. Therefore, we should analyze the windresistant capacity of the system. We simulated applicable transverse fluctuating wind velocity field, developed a lead-rubber damper （LRD） for controlling wind-induced vibration of long-span transmission towers, deduced LRD calculation model parameter, and researched the best layout scheme and installation method of LRD. To calculate the wind-induced response of tower-line coupling system in seven layout schemes, we used the time history analysis method, and obtained the efficiencies of wind-induced vibration control. LRD deformation research proved that the damp of all LRDs was efficient under the designed wind velocity when they were laid along the edge of tower heads. We studied the controlling efficiency resulting from only applying stiffness to the tower poles where the dampers used to be laid under the designed wind velocity. The results show that the controlling efficiency was not ideal when the stiffness is increased on the poles only. Therefore, LRD should contribute to both the stiffness and damp of a structure to effectively reduce the dynamic response of a tower-line coupling system under strong winds. We also discussed the controlling efficiency of LRD under static winds. The results show that there was little difference between displacements derived by the finite element time history method and those obtained by static wind method conducted by a design institute. This means the simulation on space relevant wind velocity field was accurate and reasonable.
  • 摘要：This paper reports the investigation of artificial vegetation communities on excavated slopes in a construction perturbed area of the Xiangjiaba hydroelectric power station in the Jinsha River Basin, P. R. China. Belt transect and random quadrats were used in sampling and recording the vegetation of the four selected plots on the slopes. The community of each plot was characterized based on the coverage, relative importance value, richness, diversity, evenness of species derived from the survey data. Problems of these communities were identified and corresponding regulation measures were proposed to accelerate the positive succession process of the ecosystem. It is demonstrated that the artificial vegetation restoration on the excavated slope has improved the ecological environment.
  • 摘要：To produce a smoother and more natural interpolated image, and to preserve and enhance original image details, we defined three perception-based local statistic parameters, namely contrast, noise visibility, and edge strength based on three psychophysical principles, including Weber’s Law, Fechner’s Law, and Stevens’ Power Law, and integrated these parameters into a fuzzy logic system to set up an advanced image interpolation algorithm. Application of this algorithm to detect edge behaviors and local statistical information of images demonstrated better noise removal ability and obtained sharper edges than traditional image interpolation algorithems such as nearest neighbor, bilinear and bicubic interpolation methods.
  • 摘要：A method based on solution of the inverse heat conduction problem was presented for online stress monitoring and fatigue life analysis of boiler drums. The mathematical model of the drum temperature distribution is based on the assumptions that the difference of temperature along the longitudinal axis of the boiler drum is negligible with changes only in the radial direction and the circumferential direction, and that the outer surface of drum is thermally insulated. Combining this model with the control-volume method provides temperatures at different points on a cross-section of the drum. With the temperature data, the stresses and the life expectancy of the boiler drum are derived according to the ASME code. Applying this method to the cold start-up process of a 300 MW boiler demonstrated the absence of errors caused by the boundary condition assumptions on the inner surface of the drum and testified that the method is an applicable technique for the online stress monitoring and fatigue life analysis of boiler drums.
  • 摘要：＜正＞Scope and Policy The Journal of Chongqing University-English Edition （JCQU-E） is a peerreviewed journal publishing research articles in multiple disciplines of science and technology, covering civil and environmental engineering, chemical engineer-
  • 摘要：To ensure the mining safety of working face in the protective seam and meanwhile extract pressure-relief gas of the lower protected seam and eliminate its outburst risk,the present study researched into fracture development of floor coal-rock mass of the protective seam and migration rule of pressure-relief gas from a protected seam so as to obtain an effective pressure- relief gas extraction method.The results show that after the upper protective seam was mined,mining-induced fracturing floor coal-rock mass fell into two zones:a floor heave fracture zone and a floor heave deformation zone.Lower protected seams located at different fracture subzones were different in the degree and characteristics of fracture development,and penetration borehole drilling from the floor roadway effectively extracted pressure-relief gas.The engineering practice of the Hongling coal mine in Shenyang indicated that for a lower protected seam in the floor heave fracture zone,taking the one time seam spacing（16 m）as the spacing between penetration boreholes ensured the mining safety of the No.321 working face in the protective seam and completely eliminated the outburst risk of the lower protected seam,the No.12 coal seam.
  • 摘要：Multimedia synchronization is the key technology in application of distributed multimedia.Solution of synchronization conflicts insides and among streams as well as that of user interaction,synchronization granularity refinement and synchronization precision improvement remain great challenges although great efforts have been invested by the academic circle.The construction method of a dual-scale dynamic synchronous model of multimedia presented in this article realizes multimedia synchronization on two scales based on two types of synchronous points,namely,natural synchronous points and pseudo-synchronous points,divided into two layers and taking the two methods of Petri net and agent.The model handles well with the relations of synchronization inside a stream and among streams,simplifies re-synchronization after real interaction with users and enhances dynamic synchronous expressive ability of multimedia.
  • 摘要：＜正＞Scope and PolicyThe Journal of Chongqing University-English Edition（JCQU-E）is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineer-
  • 摘要：The safety of water quality in the Three Gorges Reservoir（TGR）is very important.Protections and remediation of environment safety are very crucial for guaranteeing TGR environmental quality.When piled municipal solid waste（MSW） dumps are submerged without treatment,pollutants in the MSW will leach into the water and threaten the water safety of the reservoir.Based on the surveys of the amount,distribution and characteristics of piled MSW in the TGR area,this study focusing on the MSW dumps at the water level between 135 m to 175 m,proposed a"cleaning plan"for these dumps.After the dynamics simulation and scale-up experiments,a source density model was put forward.This 2-dimenstional water quality model was used to analyzed the impacts of piled MSW on the water quality safety in the reservoir.The results show that these dumps will potentially threaten the safety of TGR water quality if submerged without proper treatment.Given the proposed’cleaning plan’ implemented before water storage,the added concentration of COD will be less than 0.03 mg/L.This plan will surely protect the safety of the reservoir.
  • 摘要：This paper presents an acoustic design sensitivity（ADS）analysis on sound radiation of structures by using the boundary element method（BEM）.We calculated the velocity distribution of the thin plate by analytical method and the surface sound pressure by Rayleigh integral,and expressed the sound radiation power of the structure in a positive definite quadratic form of the Hermitian with an impedance matrix.The ADS analysis of the plate was thus translated into the analysis of structure dynamic sensitivity and impedance matrix sensitivity.Finally,taking a simple supported thin plate as a simulation example,we investigated the relationships among the sound power,excitation frequency and thickness of the plate.The sound radiation power of the plate has a sharp rise in the vicinity of the plate natural frequency.The method proposed is verified to be able to predict the sound radiation of a thin plate with arbitrary boundary conditions and provide a theoretical basis for structural low noise design which is important to engineering design.
  • 摘要：The global trend towards carbon reduction,energy conservation,and sustainable use of resources has led to an increased focus on the use of waste sludge in construction.We used waste sludge from a reservoir to produce high-strength sintered lightweight aggregate,and then used the densified mixture design algorithm to create high-performance concrete from the sintered aggregate with only small amounts of mixing water and cement.Ultrasonic,electrical resistance and concrete strength efficiency tests were performed in accordance with ASTM（American Society for Testing and Materials）standards.In addition to the high workability,high quality and strengths of up to 10 000 Mpa,it was found that this concrete does not require special care. The results show that if both the quality and quantity of hydraulic grout are appropriate,the concrete has excellent fresh properties as well as ideal engineering properties.
  • 摘要：After analyzing the basic composition and principles of multicolor printing system,we presented a design of real-time monitoring system for printing registration based on multitask real-time operating system μC/OS-Ⅱ.According to functional requirements of registration system and the target development platform,we described the detailed process of task division, priority assignment,and synchronization and communication,and optimized the real-time performance of system in the premise of stability assurance.Finally,the feasibility and effectiveness of the system were proved by the good performance of registration runtime system in factories.
  • 摘要：＜正＞The editors would like to thank all scholars who have invested time and effort to review,evaluate and comment on manuscripts submitted to Journal of Chongqing University（English Edition）.We are grateful to the following
  • 摘要：To research the relationship between epoxy and fiber inherent property and mechanical properties of composite,we prepared a series of composites using three kinds of high mechanical performance epoxy resins as matrices and reinforced by the same volume fraction（5%）of short carbon and glass fiber.Their mechanical properties were investigated from the perspective of chemical structure and volume shrinkage ratio of epoxy.We analyzed their tensile strength and modulus based on the mixing rule and Halpin-Tsai equation,respectively,and studied the morphology of impact test samples by scanning electron microscope.The results show that chemical bonds formed between matrix and fiber are the most important factor to improve the mechanical properties of composite.High volume shrinkage ratio is also helpful when the fiber surface was coarse.Otherwise,the tensile strength is more sensitive to interface than the tensile modulus.It is concluded that the mechanical properties of composite are strongly affected by the chemical structure of epoxy resin,the volume shrinkage ratio of cured matrices,and properties of fiber surface.
  • 摘要：A novel cyclodextrin-containing polymer was prepared by graftingβ-cyclodextrin onto the backbone of poly（D,L-lactic acid）（PLA）.First,mono（6-（2-aminoethyl）amino-6-deoxy）-β-cyclodextrin（β-CD-6-en）was prepared by sulfonylation and amination ofβ-cyclodextrin and modified poly（D,L-lactic acid）（MPLA）was prepared by free radical polymerization of maleic anhydride and PLA.Then,grafting ofβ-cyclodextrin derivative to MPLA backbone was carried out by N-acylation reaction of MPLA andβ-CD-6-en in dimethyl formamide.The synthetic polymer（PLA-β-CD）was characterized by FTIR（Fourier transform infrared）spectroscopy and proton nuclear magnetic resonance（1H NMR）spectroscopy.The results demonstrated that,in the context of remaining the chain structure of PLA,the content ofβ-CD-6-en is 1.6%by the developed synthetic method.
  • 摘要：Bridge quality assessment is an important part in the final acceptance of new bridge construction,and it is also the main basis for the reinforcement or removal of old bridges.We evaluated the weight of each affecting factor to the upper events using progressive analytical hierarchy process（AHP）with the adoption of 3 scaling,reduced the calculation in analytical process,and precluded the nonuniformity of the scaling system.We obtained a comprehensive evaluation system of bridge quality, and verified its practicality and effectiveness using numerical examples.
  • 摘要：We studied the decomposition of two haloacetic acids （HAAs）,dichloroacetic acid （DCAA） and trichloroacetic acid （TCAA）,in water by single oxidants ozone （O3） and ultraviolet radiation （UV） and the advanced oxidation processes （AOPs） constituted by the combinations of O3/UV,H2O2/UV,O3 /H2O2,and O3/H2O2/UV. The concentrations of HAAs were analyzed at specified time intervals to track their decomposition. Except for O3 and UV,the four combined oxidation processes remarkably enhance the decomposition of DCAA and TCAA owing to the generated very reactive hydroxyl radicals. The fastest decomposition process is O3/H2O2/UV,closely followed by O3/UV. DCAA is much easier to decompose than TCAA. The kinetics of HAA decomposition by O3/UV can be described well by a pseudo first-order reaction model under a constant initial dissolved O3 concentration and fixed UV radiation. Humic acids and HCO3-in the reaction system both decrease the decomposition rate constants for DCAA and TCAA. The amount of H2O2 accumulates in the presence of humic acids in the O3/UV process.
  • 摘要：By constructing two suitable generalized Lyapunov functions,we derived a generalized ellipsoidal estimate of the globally attractive set and positively invariant set of the unified chaotic system with the parameters α=1/29 and 1/29＜α＜2/29,respectively,which extends some related results of Li,et al. [Li DM,Lu JA,Wu XQ,Chen GR,Estimating the global basin of attraction and positively invariant set for the Lorenz system and a unified chaotic system,Journal of Mathematical Analysis and Applications,2006,323（2）: 844-853]. The theoretical results obtained in this paper will find wide application in chaos control and synchronization.
  • 摘要：A high-performance digital servo system built on the platform of a field programmable gate array （FPGA）,a fully digitized hardware design scheme of a direct torque control （DTC） and a low speed permanent magnet synchronous motor （PMSM） is proposed. The DTC strategy of PMSM is described with Verilog hardware description language and is employed on-chip FPGA in accordance with the electronic design automation design methodology. Due to large torque ripples in low speed PMSM,the hysteresis controller in a conventional PMSM DTC was replaced by a fuzzy controller. This FPGA scheme integrates the direct torque controller strategy,the time speed measurement algorithm,the fuzzy regulating technique and the space vector pulse width modulation principle. Experimental results indicate the fuzzy controller can provide a controllable speed at 20 r min-1 and torque at 330 N m with satisfactory dynamic and static performance. Furthermore,the results show that this new control strategy decreases the torque ripple drastically and enhances control performance.
  • 摘要：We prepared an SbSn intermetallic compound powder with a mixture of equal molar amounts of antimony （Sb） and tin （Sn） by melt-annealing and high-energy ball milling,and characterized the obtained substance with XRD （X-ray diffraction）,DSC （differential scanning calorimetry）,SEM （scanning electron microscopy）,and XPS （X-ray photoelectron spectroscopy）. The prepared SbSn has a hexagonal structure with a melting point of 425 °C. The particles have a dendritic appearance in micromorphology images. More Sb atoms are enriched on the surface than Sn atoms. A desulfurization efficiency of up to 33.92% can be obtained when applying this powder as a medium in the electric desulfurization of crude oil under the following conditions: an emulsion with a volumetric ratio of water to oil at 20:80,a surfactant mass fraction in the emulsion of 0.18%,a processing time of 17 h,and a voltage of 9.68 V. SbSn could be a promising catalyst for desulfurizing crude oil. The desulfurization performance is ascribed to the electron cavities formed by current induction.
  • 摘要：Polymer-immobilized catalysis has many advantages such as easy recovery and reuse of catalyst. We prepared three novel chiral 1,1′-bi-2-naphthol-Ti coordination polymers with properly designed ligands and Ti（OiPr）4 under mild conditions. The prepared polymers exhibited good activity and excellent enantioselectivity （over 99%ee） in catalyzing the asymmetric oxidation of sulfides. The bridge linker in the polymer and the reaction solvent noticeably affected the enantioselectivity. The chiral coordination polymer was very stable and easy to separate from catalyzed reaction systems,with no significant loss of activity or enantioselectivity after reuse for at least ten times. These findings suggest a promising type of catalysts for synthesizing the widely used sulfoxides by asymmetrically oxidizing sulfides.
  • 摘要：Many complex dynamical networks display synchronization phenomena. We introduce a general complex dynamical network model. The model is equivalent to a simple vector model of adopting the Kronecker product. Some synchronization criteria,including time-variant networks and time-varying networks,are deduced based on Lyapunov’s stability theory,and they are proven on the condition of obtaining a certain synchronous solution of an isolated cell. In particular,the inner-coupling matrix directly determines the synchronization of the time-invariant network; while for a time-varying periodic dynamical network,the asymptotic stability of a synchronous solution is determined by a constant matrix which is related to the fundamental solution matrices of the linearization system. Finally,illustrative examples are given to validate the results.
  • 摘要：To describe properties of the high frequency gravitational wave （HFGW） propagating through the vacuum gravitational field in Robertson-Walker background space-time,we calculated its energy momentum pseudo-tensor （EMPT） in the limit of short wavelengths by taking the Brill-Hartle average on the second order perturbation of the Einstein tensor over several wavelengths. By rewriting the EMPT as a form of perfect fluid,the dynamical back-reaction of HFGW on the background space-time was discussed. The result shows that the energy density of HFGW,which is in the gauge we chose,is positive definite. The HFGW serves as a source for curving the background space-time and affects the dynamical evolution and time evolution of the scale factor of the Robertson-Walker metric.
  • 摘要：Data envelopment analysis was applied to determine relative efficiencies of state-owned and joint-stock banks in Chongqing,P. R. China,during the years 1996 to 2000. We found that state-owned banks have low levels of efficiency when compared with joint-stock banks,but some joint-stock bank branches have low efficiency scores. Efficiency difference testing by using the Mann-Whitney rank order statistic indicates that the efficiency gap between state-owned and joint-stock banks is insignificant,which is characteristic of regional banks. We also presented some factors that may affect bank efficiency,and offer suggestions to improve bank management and efficiency.
  • 摘要：Azo dyes discharged in the environment are persistent organic pollutants （POPs）,which are very difficult to remove. We developed a microwave-assisted Fenton-like process to degrade methyl orange （MO）,an azo dye,with hydrogen peroxide （H2O2） catalyzed by chromium compounds coexisting with MO in the solution. Comparison between the Cr（Ⅲ）-H2O2 and Cr（VI）-H2O2 systems shows that Cr（VI） has a stronger and more stable catalytical activity than Cr（Ⅲ）,and Cr（Ⅲ） is more susceptible to a change in the acidity or alkalinity of the reaction system. With a Cr（VI） concentration of 10 mmol L-1 or a Cr（Ⅲ） concentration of 12 mmol L?1 in the solution under the microwave irradiation of a power larger than 300 W for 3 min,10 mmol L-1 H2O2 can degrade more than 95% of 1 000 mg L-1 methyl orange; when the microwave power is increased to 700 W,the same amount of H2O2 can degrade all methyl orange in the solution with the same amount of Cr（VI） catalyst. Ultraviolet-visible spectrography indicates the cleavage of the azo bond in methyl orange after treatment,suggesting the potential of this Fenton-like process to degrade azo dye POPs. Reusing waste chromium compounds coexisting with dyestuff in wastewater to catalyze the degradation of azo dyes could be a cost-effective technique for azo dyes and chromate manufacturers and/or users to treat their wastewater and prevent POPs from endangering the environment. This is of particular importance to controlling the water quality of the Three Gorges Reservoir.
  • 摘要：Proper treatment of weak subgrade soil is very important to building a highway of good quality. We proposed an entropy-based multi-criterion group decision analysis method for a group of experts to evaluate alternatives of weak subgrade treatment,with an aim to select the optimum technique which is technically,economically and socially viable. We used fuzzy theory to analyze multiple experts’ evaluation on various factors of each alterative treatment. Different experts’ evaluations are integrated by the group eigenvalue method. An entropy weight is introduced to minimize the negative influences of subjective human factors of experts. The optimum alternative is identified with ideal point discriminant analysis to calculate the distance of each alternative to the ideal point and prioritize all alternatives according to their distances. A case study on a section of the Shiman Expressway verified that the proposed method can give a rational decision on the optimum method of weak subgrade treatment.

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