Abstract:The initial equilibrium state analysis is proposed for the self-anchored suspension bridge with spatial cables, through integral analysis of cable-hanger system and tower-beam system. The main study focuses on the coupling characteristic of spatial cable-hanger system and self-equilibrium characteristic of self-anchored system. A simplified model is established in which spatial cable-hanger is simplified as parabola in vertical plane and segmental lines in horizontal plane, and simplified analytical formulas are deduced by the minimum potential energy principle. Steffens-Newton algorithm is employed to solve actual cable-hanger coupling model，and FEA method is incorporated to establish numerical iterative method for entire equilibrium state. The program SASB-IESA is written. A numerical example is solved with the two proposed methods respectively, and their applicability is pointed out based on the comparison of their result accuracy.

Abstract:Taking a preliminary design alterative for the broadening engineering of the existent single-tower cable-stayed bridge, Tanggu Haihe Bridge in Tianjin, with a main span of 310m, the aerodynamic interference effects on flutter and vortex-excited resonance of cable-stayed bridges with twin-separate parallel box decks were investigated via a series of wind tunnel tests of spring-suspended sectional model. The results show that: because of the aerodynamic interference between the two adjacent separate box deck, the flutter critical wind speeds of the twin-separate box deck bridge drops evidently and the turning point of the corresponding aerodynamic derivative curve from descending to ascending is brought forward, compared with those of the existent single-deck bridge. This indicates the decline of bridge flutter stability due to the aerodynamic interference of this type. The results also demonstrated that the maximal amplitudes of the vortex-excited resonance of the of the twin-separate box deck bridge in both the vertical and torsional directions increase due to the aerodynamic interference of this type, compared with those of the existent single-deck bridge. Correspondingly, the lock-in zone of wind speed is widened, and the onset wind speed decreases making the Strouhal numbers increased slightly. It is also found that the aerodynamic interference effect between the two adjacent separate box decks is more significant on the flutter and vortex-excited resonance of the leeward deck than on those of the windward deck. In sum, it is necessary to consider the aerodynamic interference effect when broadening the existent bridge into a twin-separate parallel deck bridge.

Abstract:The paper presents a research on the internal shear strength of a type of needle-punched GCL and the influencing factors on the basis of the laboratory direct shear test, the direct shear apparatus is modified to meet the research requirements. Experimental results show that: the internal shear strength of GCL is controlled by the needle-punched fiber, other elements have minor influence on the internal shear strength; normal stress and hydration liquid both have impacts on GCL’s internal shear strength. Shear strength increases with the increasing of normal stress, and the strength reaches the largest value when GCL is hydrated by de-ioned, distilled water; in practice, GCLs should be pre-hydrated with tap water before being loaded, this measure can increase the stability of barrier systems.

Abstract:Experiments on structural progressive collapse were carried out to truss-beam in three dimensional system model. A manually controlled apparatus inducing initial member failure was developed, which can be easily installed as part of structural members subjected axial forces. By using non-contact digital image processing technique and high frequency strain acquisition system, the displacements and strains occurred during the dynamic process after initial member failure could be obtained. The duration of collapse process, displacement and strain history at the measuring spots were analyzed to reveal the collapse mechanism. The results show that the margin of loading capacity of members over their inner forces induced by vertical loads and the interaction of structural components in the three dimensional system provide main redundancy against progressive collapse. Simple model analysis and non-linear dynamic numerical simulation were also performed to explain the behavior of failure process.

Abstract:Based on the theory of elastic thin plate, the internal force and deformation of a special retaining structure-circular no-embeded diaphragm under lateral soil and water pressure during excavation of circular swirling pool were studied. The characteristics of internal force and deformation of the circular diaphragm wall structure with two kinds of different boundary conditions at bottom -free or fixed were analyzed. The influence of wall thickness, radius, height and elastic module on its internal force and deformation were also studied. Results show that, under lateral soil and water load, the internal force of diaphragm wall is dominated by the circumferential force, while moment and shear force are relatively small. When its bottom was fixed, the maximum deformation of the wall appears near its bottom. Compare to other parameters, the parameter radius R influence the internal forces and deformation strongly. This article also gives some suggestions on the design of circular no-embeded diaphragm wall of swirl pool.

Abstract:A block-layered rock slope with a special block structure has a greater difference from a general layered rock slope in failure modes. In this paper, the bedding and anti-dip block-layered rock slopes are modeled in detail by indoor tests and the possible failure modes of two typical block-layered rock slopes are qualitatively determined. And the failure modes are extended to a general state based on the possible failure characteristics in practical engineering. In addition, the cases of the indoor model tests are analyzed using upper bound limit analysis method. The results show that the upper bound limit analysis method has a good performance to the stability analysis of a block-layered rock slope. Finally, the upper bound limit analysis method is deducted to a general failure mode of a block-layered rock slope. This extent application of the upper bound limit analysis method is developed to an effective approach for the stability analysis of a block-layered rock slope.

Abstract:Circular increment step load and unload test, shear rheological test and two-axes compression test were carried out to study the rheological properties based on Ⅱ-Ⅴ grade surrounding rock of Wuji highway tunnels in Jiangxi Province. The tests results showed that Ⅱ-Ⅳ grade surrounding rock contained two creep sections, namely transitionary creep and stability creep, and the failure behavior of the rock is brittle fracture.Ⅴ grade surrounding rock contained three creep sections, namely transitionary creep, stability creep and accelerating creep, and the failure behavior of the rock is plastic yield. Ⅱ-Ⅳ grade surrounding rock could be reasonably simulated with generalized Kelvin modal through the modal identification, while Ⅴ grade surrounding rock was well agreed with the nonlinear modal. Rheological parameters related to stress level were also obtained by modal identification. The method of modal identification could be applied to other rock beyond slate.

Abstract:An aeroelastic model was designed with discrete stiffness method to investigate the wind-induced response of UHV transmission tower. Prototype structure is a typical suspension tower, a part of 1000kV UHV double-circuit transmission line from Huainan to Shanghai. Wind tunnel test on the model has been conducted with different wind speeds and wind directions in a turbulent flow. According to the results of the test, it is obtained that wind-induced response of the model increases with the wind speed, displacement reaches maximum at 15o wind angle of attack, the vibration response of X-direction is close to that of Y-direction and the transverse response is evident. And acceleration response on the Y-direction reaches the maximum at 0o wind angle of attack, while X-direction reaches the maximum at 90o wind angle of attack, but for all cases acceleration RMS of X-direction is more evident than that of Y-direction.

Abstract:A 2D numerical model is built to simulate the sediment transport process in the Yangtze estuary by DELFT3D model at first. Then a morphological model is built with generalized flux process in the flood and dry seasons combined with the variation of tidal ranges at outer sea for a long-period simulation of the evolution of tidal flat. The model is validated through the surveyed data and the simulation result presents a good agreement with the real measured value. Further-more, a prediction of the evolution process of Nanhui tidal flat is given under the impact of the Three Gorges Project. In general, there’s still a stable development of Nanhui tidal flat and expanding to the southeast with no significant erosion caused by the reduction of water-sediment from the upstream in the next 5 to 20 years after the Three Gorge reservoir’s operation.

Abstract:The cement concrete pavement on rigid or semi-rigid base is hereof simplified as a model of double-layered structure with unequal planar dimensions resting on an elastic foundation, under axle (tire) load, by using thin shell element the relationship between element meshing size and result accuracy is discussed, the locations and magnitudes of the maximum loading stresses in pavement structure under moving axle load along longitudinal edge are thoroughly studied, the effects of base extension on the maximum loading stresses in pavement and base are also analyzed, the results showed that with increase of the base extended amount the maximum loading stress in pavement will drop 0~33%; whereas the maximum stress in base will increase remarkably. Furthermore, the difference of the maximum loading stresses in pavement and base by using shell element and solid element is compared, when the thicknesses of pavement exceeding a limited value, the maximum stress in pavement based upon shell element is 0~20% larger than that of solid element; but in base is 2~30% smaller; in the end, the modified coefficient for the maximum stresses in pavement and base by using shell element is provided.

Abstract:First analysis the style of shared-path routing based on rail network and the passenger flow characteristics, then focuses on the design of shared-path routing diagram structure, the using method of the train set of linking or of non-linking, the reasonable match of train interval, the optimization of first and last train timetable and the coordination of interchanger station, the effective utilization of depot and the effect of delay propagation. At last, the computing procedure and method of timetable designing was discussed.

Abstract:In order to improve the hydraulic permeability and intensify denitrification of subsurface wastewater infiltration system, one apparatus was established in a pilot laboratory with the mediums of 55% cinder, 25% soil and 20% grass carbon mixed completely. The apparatus was dosed 4 times daily with domestic wastewater at 10 cm•d-1. Operating conditions were changed in order to improve the removal efficiency of TN. The average removal efficiency of COD, NH4+-N, TN were 73.3%, 98.2%, 20.1%, respectively, when outlet location was at normal position; The average removal efficiency of COD, NH4+-N, TN were obtained 75.4%, 79.1%, 26.9%, respectively, When outlet location was heightened 30 cm, the bottom of apparatus was submerged so that anaerobic environment was formed; The average removal efficiency of COD, NH4+-N, TN were obtained 88.9%, 88.5%, 55.7%, respectively, when the apparatus was conducted in glucose added in domestic wastewater. The results showed that the removal of TN was not been improved by adding grass carbon in apparatus; outlet location raised could increased TN removal efficiency from 20.1% to 26.9%, but the action was limited; the glucose added could increased TN removal efficiency from 26.9% to 55.7%, and TN concentration of effluent decreased from 22.8 mg•L-1 to 14.2 mg•L-1; at the same time, the removal of COD, NH4+-N had not been affected. So the critical factor of the TN removal blocked was carbon absent.

Abstract:Granular activated carbon (GAC) was modified with FeCl2•4H2O and KMnO4. The scheme was optimized by orthogonal design combining with BP neural network to get effective removal efficiency of arsenite. The four factors five levels orthogonal design table, such as overall mole concentration, the mole ratio of FeCl2•4H2O and KMnO4, water bath temperature and drying temperature as factors and arsenite removal rate as the goal factor, was established. The optimal modified scheme was found via predicting and selecting the BP network model through four factors as inputs and arsenite removal rate as output, which was combined with the effective fitting function. The overall mole concentration and the mole ratio of FeCl2•4H2O and KMnO4 were 0.12mol•L-1and 3:1, water bath temperate and drying temperate were 45℃ and 190℃,respectively. The arsenite removal rate was 0.765, so there was 3.00% error discrepancy compared with the model value 0.788. XRD and SEM were applied to gain the optimal modified GAC surface property. At the same time, the iron and manganese amount was measured. These supplied fundamental information for the further research.

Abstract:This paper presents the volume of fluid (VOF) model and its governing equations. A three-dimensional transient model of water-filling pipelines is solved numerically by using k~εturbulent model. The paper gives a water-filling mathematical model of liquid volume fraction against time. The characteristics and energy losses in the gas-liquid two-phase flow are also analyzed. The modeling results show that there are four flow regimes, which are stratified, slug, plug and bubbly, exist in water-filling pipelines. The gas will move to downstream water networks with flow as plug and bubbly flow patterns. The reasons for the increased energy losses of two-phase flow, which are more than single-phase flow, are due to the interaction between the interfaces of gas and liquid and the increasing of average friction factor between the fluid and pipe walls. In inclined downward pipes, the axial velocity profiles in horizontal centerline are symmetrical. In vertical centerline the axial velocity profiles of gas and liquid near the top and the bottom of the pipe appear peaks, respectively. While on the interface of gas and liquid the one appears the slowest.

Abstract:An exact analysis of steady-state heat conduction was presented for the axisymmetric functionally graded circular plate. Based on the basic equation of heat conduction of an orthotropic functionally graded circular plate, assuming that the heat conductivity has the exponential dependence on the plate-thickness direction, an exact solution was obtained for the axisymmetric functionally graded circular plate subjected to arbitrary thermal loads on its upper and lower surfaces by means of variable separation method. With the variation of material graded distributions and plate-thickness, the influence of the temperature field distributions of the circular plate was studied through a numerical example. The obtained exact solution could serve as a benchmark result to assess other approximate methodologies.

Abstract:The uniaxial fretting fatigue characteristics of LZ50 axle steel such as stress-strain hysteresis loop, fretting wear scars, fracture and cross section morphology were investigated. The formation and evolution mechanism of the debris produced in the fretting wear process and the fatigue failure mechanism were analyzed, too. The results indicate that, LZ50, under the condition of uniaxial fretting fatigue loading, had less irreversible plastic power consumption. The fretting fatigue damage mechanisms are adhesive wear and abrasive wear, accompanied with oxidation wear. The fragmentation products wore off from the matrix material surface are oxidized and formed into wear debris, in which the hard particles aggravate the abrasive wear, and accelerated the fretting fatigue failure. The dimension of fretting fatigue crack initiation is about 100μm, and fracture surface is perpendicular to the direction of cyclic loading.

Abstract:A genetic algorithm was proposed for solving the problem of assigning welding point to multi-robots in car body-in-white manufacture. Regarding the welding point and robots as spatial point and motion time of the robot as value vector, we established a multi-Knapsack Problem model. Through processing selection 、crossover and mutation genetic operators，convergence ability of the algorithm was strengthened . Taking the welding point allocation of the side panel repair welding working procedure as example, welding point allocation result showed that each robot has balanced burthen and the cycle time meets the engineering demands.

Abstract:A combined physical model of the engine operation process and dynamics of the crank and connection mechanism was presented based on an objectoriented and multidomain simulation platform SimulationX.Thus,how to truly simulate the 1D firing model and 3D dynamics analysis of the engine was achieved.The dynamical results of the crank and connection mechanism of a practical engine were obtained via multibody system simulation.The parameters of interaction forces after the simulation provide the boundary conditions for the future analysis on thermodynamics and kinetics of the engine.Meanwhile,the whole simulation process offers one of the evidence for the virtual design of the engine.

Abstract:optimized division is a research of great importance in computer-supported collaborative learning (CSCL).The key to establishing a learning community of interest is to determine and calculate the interest similarity between the learners. To get rid of the disadvantages of neglecting the semantic relevance between terms in the traditional vector space model, ontology-based Vector Space Model(VSM) using semantic web technology is presented to calculate the learner’s interest eigenvector, which can enhance the relative accuracy of the interest similarity. And a self-organization grouping algorithm for community is put forward, based on the learners’ interest similarity match-degree and its concentration. Great dimensions would take place with the ontology to construct vector space, thus Concept Indexing(CI) method and reasonable treatment to matrix of interest Eigen value are here used to promote the calculation efficiency. Finally, an experimental analysis of online education cases is carried out to verify the model algorithm with high efficiency and good scalability.

Abstract:Existing Bayesian network learning approaches based on search & scoring usually work with feasible solutions which satisfy directed acyclic graph. This kind of approaches often removes infeasible solutions or converts infeasible solutions to feasible solutions when the solutions are infeasible. However, some infeasible solutions maybe have more useful information. This paper proposes the ISEC method for learning Bayesian network by using feasible and infeasible solutions synchronously based on an infeasible solution selection strategy. Then, the method can take advantage of the information in the infeasible solutions. Experiments show that the proposed approach can achieve better performance in less time than the approaches which only use feasible solutions.

Abstract:Based on empirical data, acceptance number (c) is calculated by inverse poisson. A new method is use to calculate sample size n, which uses lot size N and acceptable quality level of process average (AQL). The scheme of continuous spatial data with large lot size is designed (N, n, c). At last, the spatial data schemes, designed based on the developed algorithm, are compared with them which based on percent sampling inspection and sampling table. The results show the merits and the implementary conditions of the developed algorithm.

Abstract:Abstract: CRS-OIS is a Common Reflection Surface (CRS) stack method performed by output imaging scheme (OIS). The main advantage of CRS-OIS is that a high quality prestack gather can be obtained. In this paper, this future of CRS-OIS has been utilized in the 2D seismic data processing to suppress random noise and interpolate missing traces. The synthetic and real data examples proved the effectiveness of CRS-OIS on this aspect which demonstrated a huge potential in application. Keywords: CRS-OIS, CRSBIN, Noise suppression, Data interpolation

Abstract:To suppress the speckle in Synthetic Aperture Radar (SAR) images, a novel adaptive algorithm based on SVR is proposed in this paper. A SAR image is regarded as a 2-D continuous function and is approximated by support vector regression (SVR). The result of regression is used to describe the relationship between pixels and the one in its neighborhood. Based on the relationship, the noise was classified to different kinds and suppressed. In the procedure of regression, the wavelet kernel function is used to improve the accuracy. The result of experiments show that this method is effective.

Abstract:For the nondegenerate smooth map between manifolds, by using the divergence formula on fibre of the projective sphere bundle, another simpler way to prove the first variation formula of the energy functional is given. At the same time, the relations between the second fundamental forms (resp. the mean curvature) of Finsler metric and that of Riemannian metric in Randers spaces are discussed. At last, a classification theorem of strongly minimal submanifolds in Randers spaces is given.

Abstract:Let G be a graph. The Ramsey number r(G) is the minimum integer N such that any two edge-coloring of K_N contains a monochromatic G. Using an algebraic construction it is shown that r(Km,n)>= 2^m(n- n^{0.525}) for large n.

Abstract:The collision process of two deformed polymer drops undergoing a shear flow was simulated by using dissipative particle dynamics (DPD). The polymer drop is made up of many finite extensible non-linear elastic (FENE) bead spring chains. Both separating collision and coalescence collision were considered. The shear-induced anisotropic self-diffusion phenomenon of drops was studied. Besides capillary number (Ca) and viscosity ratio, the interfacial tension between two drops plays an important role in the coalescence collision or separation collision of the two drops. Due to the non-zero surface tension between two drops, a compound drop could be formed under certain conditions, and the compound drop tumbles in simple shear flow.

Abstract:A research was made of the data collected from 290 firms in Yangtze River delta involved in contribution from the year 2004 to 2006. The analysis and test by a structural equation modeling show that corporate giving can be reified to different kinds of characteristics, which affect the competitive advantages of firms differently. The characteristics of contribution have indirect influence on the firm’s competitive advantages by transferring social capital to firms and the competitive advantages of firms are improved. Finally, some effective policies are proposed to encourage firms to participate into philanthropy.

Abstract:In order to shed light on the relationship between spatial heterogeneity of micro locational factors and financial specialization in urban areas. A unified spatial database has been created based on integrating bank mesh point and relevant social & economical dataset through GIS and ESDA. Grid computation has been applied on the DB and a BP neural network model was constructed for simulating the spatial effectiveness of those micro locational factors which impact the clustering of those points. As stated within this paper, most of the bank mesh points are located in the central area enclosed by the outer ring, especially within the inner ring road, where exists the traditional CBD of Shanghai. And the distribution shows a trend of cluster varied according to the spatial lag at the global scale. To explain the formation of the spatial distribution of banking industry in Shanghai, we must take into account the history legacy, the state intervention and urban planning, the market forces etc.