Showing papers in "Journal of Wuhan University of Technology in 2005"
Journal Article•
TL;DR: In this article, the fractal dimensions of rock acoustic emissions on different stress levels under uniaxial compression were obtained by analysing the experimental data It increased with the dimension of phase space.
Abstract: Relevant fractal dimensions of rock acoustic emissions on different stress levels under uniaxial compression were obtained by analysing the experimental data It increased with the dimension of phase space The results showed that the dimensions of most of the rock samples growed slowly when applied stress was less than 60% of the fracture stress, and reached minor values when the samples fractured It predicted that the reduction of the fractal dimension indicated the occurring of the major cracks or failure
12 citations
Journal Article•
TL;DR: In this article, NH+4-N and H2PO~--4 were used to remove ammonia nitrogen and phosphate synchronously in static experiment, and the optimal pH was 4.
Abstract: Adsorbent was firstly immersed in solution of La~(3+) with concentration of 0.5% and pH of 10 for more than 16 h; secondly it was dried up and stabilized at temperature of 110 ℃ for 24 h; then it was roasted at temperature between 400～(500 ℃) for 1 h; finally that with radius more than 120 mesh was chosen to remove ammonia nitrogen and phosphate synchronously in static experiment. According to this experiment, optimal pH was 4 and the largest static adsorbing capacities for NH~+_4-N and H_2PO~-_4 were 25 mg/g and (50 mg/g) respectively. In influence of NH~+_4-N and H_2PO~-_4 with concentrations of 10 mg/L and (5 mg/L) respectively, following results can be identified: removal efficiencies can reach 80% and 90% respectively; Removal efficiencies were still more than 80% after being regenerated for 7 times; Dynamics for this process was in accordance with Freundlich adsorption model with a correlation efficient of more than 0.99. This experiment provided a new way for treatment of NH~+_4-N and H_2PO~-_4 in slightly polluted water.
10 citations
Journal Article•
TL;DR: In this article, the critical factors influencing corrosion rate of steel in concrete were analyzed, which included c_ Cl - /c_ OH - on steel surface, the temperature on steel surfaces and concrete ohmic resistance between steel and concrete surface.
Abstract: Firstly, the critical factors influencing corrosion rate of steel in concrete were analysed in this paper, which included c_ Cl - /c_ OH - on steel surface, the temperature on steel surface and concrete ohmic resistance between steel in concrete and concrete surface. And then, since such an important influencing factor as c_ Cl - /c_ OH - was not considered in previous models, this article aimed at establishing a new model on predicting chloride-induced corrosion rate of steel in concrete based on the model from Liu T and Weyers R W. The model was proved reasonable by experimental results.
9 citations
Journal Article•
TL;DR: In this article, the concept of serials of indexes of evaluating the choice of total logistics center city location by fuzzy synthesis evaluation of entropy weights model was proposed. But the results were very good.
Abstract: This article came up with the concept of serials of indexes of evaluating the choice of total logistics centre city location by fuzzy synthesis evaluation of entropy weights model.It researched the scientific and reasonable computing rations method of large public logistics centre scale design.The model was applied to evaluate logistics and the results were very good.
9 citations
Journal Article•
TL;DR: The study showed two groups of kinematic sequences, which was obtained by classification, were very distinct and respectively represent travel characteristic that vehicle was on the crowded road and on the unblocked road.
Abstract: In the course of the development of vehicle real world driving cycle,in order to develop vehicle real world driving cycle on the relevant traffic characteristic road,the kinematic sequences must be classified according to road traffic characteristic.Taking into account the deficiency of artificial classification,the purpose of this paper was to report the application of dynamic cluster to the development of vehicle real world driving cycle.The first three principal components,which came from principle component analysis(PCA),were regarded as the cluster factors,and using the method of the dynamic cluster,the kinematic sequence's overall sample was classified.The study showed two groups of kinematic sequences,which was obtained by classification,were very distinct and respectively represent travel characteristic that vehicle was on the crowded road and on the unblocked road.
8 citations
Journal Article•
TL;DR: The specific creep of highperformance concrete (HPC) incorporated with 30,50,80% ground granulated blast-furnace slag (GGBS), 12,30,50% fly ash, 35,50%, 80% ground-grained blast furnace slag and 35% ground grained fly ash was investigated in this article.
Abstract: The specific creep of high-performance concrete(HPC) incorporated with 30%,50%,80% ground granulated blast-furnace slag(GGBS),12%,30%,50% fly ash,35% GGBS and 15% fly ash,15% GGBS and 35% fly ash, and the contrast one which without GGBS and fly ash were tested under stress strength ratio of 33% in order to clarify the effect of fly ash on creep character,the test were made under controlled temperature(20±1) ℃ and humidity (60±5)% conditions,results show that the GGBS has slight effect on the specific creep of HPC with 30% and 50% GGBS,it offers great negative effect on the creep characteristics of HPC when the incorporating proportion of GGBS reaches 80%,the specific creep after one year of HPC with 80% GGBS is 174 times of the contrast one,the fly ash offers great positive effect on the creep characteristics of HPC with 12% and 30% fly ash,the specific creep after one year are 076 and 0465 times of the contrast one respectively,it has slight effect on the specific creep of HPC when the incorporating proportion of fly ash reaches 50%,the specific creep after one year is 102 times of the contrast one,the specific creep of HPC with 35% GGBS and 15% fly ash or 15% GGBS and 35% fly ash was greatly reduced than the condition with 50% GGBS or the condition with 50% fly ash
6 citations
Journal Article•
TL;DR: In this article, the authors present the following problems in details: inducement and restraint measures of voluminal expansion when steel slag was used in cementing matrix, and the motivation of steel slags activity.
Abstract: Steel slag of alkalinity above 1.6 is a kind of mineral aggregation, with proper hydration activity and unsteady rotten expansion, the key use of it in cementing matrix is the development of activity and the restraint of expansion. Based on existing research, this study present the following problems in details:a) the inducement and restraint measures of voluminal expansion when steel slag was used in cementing matrix, and b) the motivation of steel slag activity. The study indicated the mechanical activation and the chemical activation used in steel slag are effective measures.
6 citations
Journal Article•
TL;DR: A wavelet transform image fusion based on regional features is proposed that decomposed the original images into four sub images via WT and calculated the regional features of each sub image and chose the different rule of fusion basedon regional features.
Abstract: The purpose of image fusion is to merge complementary information from multi sensor data for visual perception so as to improve the visual perception of the image. A wavelet transform image fusion based on regional features is proposed. Firstly, it decomposed the original images into four sub images via WT. Secondly, it calculated the regional features of each sub image and chose the different rule of fusion based on regional features. Finally, the whole fusion image can be obtained by inverse wavelet transform. The experiment results showed that the proposed method seemed better.
6 citations
Journal Article•
TL;DR: In this paper, the structure, bonding state and ambient atmosphere of three types of geopolymers were investigated by using infrared ray (IR) analysis, and the relationship between geopolymer and the corresponding zeolite crystals with the similar chemical composition was also discussed.
Abstract: The structure,bonding state and ambient atmosphere of Si and Al of three types of geopolymers were investigated by using infrared ray(IR) analysis.The relationship between geopolymers and the corresponding zeolite crystals with the similar chemical composition was also discussed.The infrared evidence showed that SiO_4 tetrahedral chain was bonded by AlO_4 during the process of geopolymerisation reaction,and the two types of tetrahedral jointly form the three dimensional framework structure of geopolymers.The mutual transformation between geopolymers and zeolite crystals can be realized under suitable condition,which revealed that geopolymers may be the precursors of the corresponding zeolite crystals.
6 citations
Journal Article•
TL;DR: In this paper, the effect of amount and fineness of super-fine steel slag power used on mechanical properties of concrete was studied and the mechanism of superfine steel SLAG power on properties were discussed.
Abstract: The effect of amount and fineness of super-fine steel slag power used on mechanical properties of concrete was studied in this paper and mechanism of super-fine steel slag power on properties of concrete was discussed. The critical technique and method for preparation high-performance concrete using super-fine steel slag power as mineral mixture was presented.
6 citations
Journal Article•
TL;DR: In this article, the forecast process of a port's total handling capacity with second-index flatness is introduced, and a logarithm second index flatness for forecast process is proposed.
Abstract: The forecast of ports' handling capacity is one important work before planning total arrangement of ports The influence of the work is profound and far-reachingTaking a port as an example, the paper simply introduces the forecast process of its total handling capacity with second-index flatness, puts forward logarithm second-index flatness for the forecast process of ports' total handling capacity,analyses its excellence and reaches a conclusion that logarithm second-index flatness is fit for the forecast of ports' total handling capacity which is developing rapidly It provides the scientific gist for ports' planning It can be referenced by some relational departments
Journal Article•
TL;DR: In this article, some performances that included workability, compressive strength, Young's modulus, drying shrinkage and creep, were tested for C60 concrete with and without fly ash or slag.
Abstract: In this paper, some performances that included workability, compressive strength, Young's modulus, drying shrinkage and creep, were tested for C60 concrete with and without fly ash or slag. The results showed that for concrete with fly ash or slag, the workability of the fresh concrete was improved; the compressive strength and the Young's modulus were similar to the control sample, but the drying shrinkage rate decreased after 28 d; the creep decreased with the increasing of the curing time and the strength and increased with the content of fly ash from 14% to 25%. The creep for concrete with 14% fly ash was similar with that for one with 14% slag when the load was applied after 60 d curing.
Journal Article•
TL;DR: The calibration result showed the binocular stereovision sensor well automation and higher precision, better anti-noise capability and stability, and dynamic threshold segmentation, edge extraction and contour auto-tracing technology.
Abstract: The binocular stereovision sensor has been widely used in 3D laser scanning measuring system.The automation and precision of its calibration influence the using of 3D laser scanning measuring system.Through a calibration target with multi-circular holes and two-stages calibration algorithm,calibration automation approach for binocular stereovision sensor was achieved by using dynamic threshold segmentation,edge extraction and contour auto-tracing technology.The calibration result showed its well automation and higher precision,better anti-noise capability and stability.
Journal Article•
TL;DR: In this paper, an unascertained river water quality model for simulating the transport and diffusion of pollutant accident leakage and a model for ~evaluating the risk of water quality exceeding a criterion are established by means of unascERTained mathematical theories.
Abstract: Based on the unascertained characteristics of river water environmental system, such two concepts as unascertained parameters of water quality system and unascertained risk of river water quality are defined. On the basis of it, an unascertained river water quality model for simulating the transport and diffusion of pollutant accident leakage and a model for ~evaluating the risk of river water quality exceeding a criterion are established by means of unascertained mathematical theories. According to the simulation information of river water quality, sudden-risk of river water quality can be assessed. Study result showed that it is feasible in theory and reliable on conclusion using unascertained mathematical theories to simulate river water quality and evaluate its risk.
Journal Article•
TL;DR: Based on quickqull algorithm, an improved algorithm to determine the convex hull of 2D point set was proposed in this paper, which can be applied in control points-based image registration effectively.
Abstract: Convex hull is the basic topic in computational geometry.Convex hull of point set and that of a polygon are two classes of it.Based on quickqull algorithm,an improved algorithm to determine the convex hull of 2-D point set was proposed in this paper.After finding points at eight defined extremal positions,some vertices of convex hull can be exactly determined,thus the coarse approximation of convex hull was formed.Refinement was implemented by scanning the coarse result to find the missed vertices.This can be achieved with such data structure as linklist or stack.In general case,the whole process has a computational complexity near linear time.The proposed algorithm has been applied in control points-based image registration effectively.
Journal Article•
TL;DR: In this article, the strength property and pore distribution of concrete with highly active rice husk ash were studied and the results showed that with the replacement of cement with RHA in concrete, concrete strength increased and the greater of strength increasing ratio was obtained at 7 days or 28 days curing.
Abstract: The strength property and pore distribution of concrete with highly active rice husk ash were studied. The results showed that with the replacement of cement with RHA in concrete, concrete strength increased and the greater of strength increasing ratio is obtained at 7 days or 28 days curing. The pore structure of RHA concrete has ameliorated and the average pore size of concrete especially the portion of pore that greater than 20 nm in radius is reduced. The improvement of strength of RHA concrete mainly attributed to the less Ca(OH) 2 and the ameliorating of pore structure of RHA concrete.
Journal Article•
TL;DR: In this paper, a method was proposed to separate the region which will result in local minimization by some special points, where the mobile robot will get the location of goal point by the difference of area between the region and the figures consisting of the goal point and the special points beforehand.
Abstract: To avoid the disadvantage of artificial potential field, a method was put forward to separate the region which will result in local minimization by some special points. The mobile robot will get the location of goal point by the difference of area between the region and the figures consisting of the goal point and the special points beforehand. When the goal point is outside of the region, the mobile robot can avoid entering into these regions and fall into local minimization for the limiting information.
Journal Article•
TL;DR: In this paper, a linear programming model was proposed to maximize terminal charges of final project completion in terms of fixed unit price in the bill of quantities contract and fundamental principles and the conditions of unbalanced bid.
Abstract: On the basis of characteristics of the fixed unit price in the bill of quantities contract and fundamental principles and the conditions of unbalanced bid,a linear programming model maximizing terminal charges of final project completion was established.Taking a concrete project for an example,an optimal solution of unbalanced bid was obtained by simplex method.
Journal Article•
TL;DR: In this article, a three-parameter combined power model was proposed by curve fitting of the test data recording from the pullout tests on shaft anchor used in different geotechnical engineering.
Abstract: A three-parameter combined-power model was proposed by curve fitting of the test data recording from the pullout tests on shaft anchor used in different geotechnical engineering. The representation of the parameters was also discussed. The two-parameter combine-power function model for prestress tendon was derived. The method to determine the bounded length from the degenerate model and the suggested value of its parameter G were also proposed. It was pointed out that the bounding length calculated from the average stress method was not safe enough.
Journal Article•
TL;DR: In this article, the principle of multiplex PCR was briefly introduced, its practical applications in medicines, genetics, plant biology and ocean biology, and the technological factors, including the selection of target DNA fragment, primer design,annealing temperature and time were analyzed.
Abstract: Multiplex PCR is a kind of PCR technique which amplifies more than one target DNA fragment in one reaction system at one time.It has advantages of high specificity,high sensitivity,high efficiency and low cost,which make it suitable for analyzing and characterizing samples in large quantities.In this article,the principle of multiplex PCR was briefly introduced.Its practical applications in medicines,genetics,plant biology and ocean biology were expounded.Meanwhile,the technological factors,including the selection of target DNA fragment,primer design,annealing temperature and time were analyzed and the newly progress was presented.
Journal Article•
TL;DR: The results indicated that the inorganic crystal nanoparticles could induce cancer cells death.
Abstract: HAP and TiO_2 nanoparticles were selected to incube with the hepatoma cells for 1 h and 8 h respectively.Then,hepatoma cells were collected,centrifuged,fixed,embedded and stained.The ultrastructure were viewed under transmission electron microscope(TEM).After inorganic nanoparticles uptaken by hepatoma cells,some vacuoles contained nanoparticle,with membrane on 1 h specimens and non-membrane on 8 h specimens in cytoplasma.Some endoplasmic reticulums expanded.Most mitochondrias swelled,collapsed and part of mitochondrias crista disordered. The nuclear envelope shrink,and some area pullulated from nucleus.The karyotin was pintsized and assembled at the edge.The results indicated that the inorganic crystal nanoparticles could induce cancer cells death.
Journal Article•
TL;DR: In this paper, the authors proposed an algorithm of judging concrete crack by combining with digital image processing technology, and the direction, length, average and maximum width of crack can be found out in any concrete crack image.
Abstract: Combining with digital image processing technology, the algorithm of judging concrete crack was proposed. The direction, length, average and maximum width of crack can be found out in any concrete crack image. The noise in the crack area was removed by opening and closing algorithm, and then crack was lined. Crack length, average width, slope, direction were obtained by direction chain mode. The width and maximum width of the pixel on the line were obtained by slope and crack area. Error is bigger in many branches and little crackle. The algorithm needs to be improved.
Journal Article•
TL;DR: This paper proposes and sets up highway traffic index system of safety evaluation, and puts forward the countermeasures.
Abstract: The traffic safety is one of the most outstanding problems of the highway.With the development of the highway,the settlement of the traffic safety problem is imperative.According to the actual needs of the safety management of highway,this paper proposes and sets up highway traffic index system of safety evaluation,and puts forward the countermeasures.
Journal Article•
TL;DR: A new particle swarm optimization (PSO), PSO with bounded mutation operator, was developed and could achieve faster speed of optimization and better precision of optimization, which was proved by the theory and experimental methods.
Abstract: A new particle swarm optimization (PSO), PSO with bounded mutation operator, was developed. In contrast to the original PSO, in this algorithm, PSO with bounded mutation operator would make the particles redistributed equably close to boundary when place of particle exceeds feasible region during iteration. The particles would be redistributed equably in whole feasible region when speed of particle exceeds feasible region. PSO with bounded mutation operator could achieve faster speed of optimization and better precision of optimization, which was proved by the theory and experimental methods.
Journal Article•
TL;DR: In this paper, the degradation speed of the chitosan membrane was faster than the PDLLA membrane, which has the same molecular weight as the pico-polysilicon membrane.
Abstract: Chitosan membrane and PDLLA membrane for adhesion were prepared.The weight loss after degradation in vitro and membrane surface morphology was observed by SEM.The degradation performances of the two different kinds of membrane were researched in this paper.In the phophorous buffer solution,the degradation speed of the PDLLA membrane which has small molecular weight was faster.The degradation speed of the chitosan membrane was faster than PDLLA membrane which has the same molecular weight as the chitosan membrane.
Journal Article•
TL;DR: The analysis of city distribution forming mechanism is to reveal the functions among the main factors of processing city distribution, such as marketing demand, government positive directing and planning, the intensive function of a city distribution center, logistics and supply chain theory, and modern technology support as mentioned in this paper.
Abstract: The analysis of city distribution forming mechanism is to reveal the functions among the main factors of processing city distribution forming.This paper,expounds the forming mechanism of city distribution.From many aspects,such as city distribution's marketing demand,government positive directing and planning,the intensive function of city distribution center,logistics and supply chain theory,and modern technology support etc.
Journal Article•
TL;DR: Based on the experiment on seismic behavior of low strength, brick wall with a window reinforced by carbon fiber sheet under lower cycle reversal loads, the seismic reinforcement effectiveness was studied in this article, where individual brick wall's failure shape, deformation, energy consumption and load bearing capacity are generally analyzed.
Abstract: Based on the experiment on seismic behavior of low strength, brick wall with a window reinforced by carbon fiber sheet under lower cycle reversal loads, the seismic reinforcement effectiveness was studied. The individual brick wall's failure shape, deformation, energy consumption and load bearing capacity are generally analyzed. The result indicated that the strengthening effect was very obvious.
Journal Article•
TL;DR: In this article, the influence of aggregate composition on the macro-performance of semi-lightweight concrete was investigated and it was shown that aggregate composition could significantly affect the apparent density, compressive streng th, split tensile strength and elastic modulus of semi lightweight concrete.
Abstract: In this paper, the influence of aggregate composition on the macro-performance of semi lightweight concrete was investigated. The results showed that aggregate composition could significantly affect the apparent density, compressive streng th, split tensile strength and elastic modulus of semi-lightweight concrete.
Journal Article•
TL;DR: In this article, the surface tension of aliphatic superplasticizer solution and the potential of cement particles in Cement-Water-SuperPlasticizer system were studied in comparison with naphthalene based super-plasticizers.
Abstract: The surface tension of aliphatic superplasticizer solution and ζ-potential of cement particles in Cement-Water-Superplasticizer system were studied in comparison with naphthalene based superplasticizer. The adsorption amount of two types of superplasticizer and their adsorptive characteristics on cement particles were measured and analyzed according to the molecular weight and functional groups. A multilayer adsorption phenomenon was concluded when superplasticizer was adsorbed on cement particles. Langmiur single layer adsorption may occur only in the case of low superplasticizer concentration.
Journal Article•
TL;DR: In this article, the authors described a kind of agency by agreement under the asymmetrical information condition models, and they found that the agent's risk partiality can influence the form of the optimum incentive mechanism and allocation of risks of both sides of the agency by agreements directly and at the same time, it endows a variable in encouraging contraet with new economic implication.
Abstract: Proceeding from real economic life,this paper has described a kind of agency by agreement under the asymmetrical information condition models.Through the optimum analysis of the models,it is found that the agent's risk partiality can influence the form of the optimum incentive mechanism and allocation of risks of both sides of the agency by agreement directly and at the same time,it endows a variable in encouraging contraet with new economic implication.