Abstract:In order to understand soil-structure dynamic interaction, tests were done about low frequency vibration exciting a large proportion of raft-foundation-steel frame in trough and on rigid foundation.Changing the stiffness of the superstructure, four contrast tests were conducted.By signal spectrum and time domain analysis, the frequency and dynamic responses of the steel frame were obtained, and it was found that the frequency and dynamic responses had something to do with the soil, which were mainly caused by the change of superstructure stiffness.The natural vibration frequency of structure reduced in trough compared with that on rigid foundation.As the superstructure stiffness increased, the reduction coefficient of frequency increased, which in the test was up to 21.63%.Also, the maximum shear force for columns, peak acceleration and displacement of each floor had obvious variation, and the reduction coefficient of acceleration could be up to 30%.

Abstract:Moso bamboo, a kind of rich forest resource in China, was selected as the building material and tested.The physical and mechanical properties have been tested, and the results show that the main mechanical properties of bamboo pole are better than those of TC13 grade of coniferous wood.So Moso bamboo poles can be used as a structural material.Several types of metal connections were presented to connect bamboo poles with other materials, and the processing standardization has been almost fulfilled by utilizing the metal connections.Two pieces of shear walls made of bamboo poles were conducted through lateral resistance tests.The lateral resistance capacity of this kind of shear wall is about 65%, compared with the same wall of light wood structure.Three pieces of bamboo pole trusses were tested, and the ultimate loading capacity is 12.3 kN.A prefabricated bamboo pole demonstration house with a construction area of 50 m2 was designed and constructed according to the testing results and the code for the design of timber structures.The demonstration house has been used for about three years and its condition is desirable.

Abstract:This paper presented the results of experimental studies on reinforced concrete columns strengthened with steel fiber cement mortar with mesh reinforcement (SFMMR) under the combination of axial load and bending moment.A total of eight nearly full-size specimens with rectangular cross section were prepared and tested under eccentric compressive loading up to failure.The overall length of specimens with two haunched heads was 1 200 mm.Different wire mesh spacing and two eccentricities of 70 mm and 150 mm were investigated.The effects of these parameters of the ultimate load and cracking behavior of the columns as well as the variation of longitudinal strains on different faces of the columns were studied.The results demonstrated a significant enhancement of the performance of strengthened columns, compared with unstrengthened columns.

Abstract:The friction forces between connecting plates are not taken into account in the shear capacity calculation of high-strength bolted bearing-type joints in the current Codes, which is not consistent with the bearing mechanism of high strength bolts.The principle of virtual work was adopted to go through pre-stress simulation method, and the finite element method was adopted to analyze the loading process of bearing-type joints.The results show that, without considering the friction forces between connecting plates, when the bearing capacity of connection is controlled by bolt strength, the shear capacity of high-strength bolted bearing-type joints will be underestimated.In this paper, based on numerical simulation, a reasonable method considering friction forces between connecting plates was proposed to calculate shear capacity of high-strength bolted bearing-type joints.Compared with FEM results, the error of new method is less than 10%.

Abstract:Based on probability and mathematical statistics, a new method was proposed by analyzing the information of measured geometric position deviation of selected joints and by using truncated Gaussian distribution model to simulate the distribution of the geometric position of unmeasured joints.With the Monte-Carlo method, a group of stability factors was obtained, and the critical stability factor was determined with the probability theory.Furthermore, the critical stability factor calculation flow chart of existing reticulated shells was given.By taking a Kiewit single layer reticulated shell as an example, the feasibility of this method was verified.

Abstract:Reasonable determination of indoor air quality controlled objective is an important prerequisite for solving indoor air pollution problem with multi-component and low concentration and building health and comfort indoor air environment.By combining pollution exposure conditions with human body metabolic pollutant and the pollutant emitting from building and furnishing material, the perceived indoor air quality controlled objective was studied for Chinese subjects on the basis of exposure experiments.Moreover, air quality acceptability and odor intensity were obtained by the subjects' votes.The results show that there exists obvious difference between visitors' requirement of indoor air quality controlled objective and that of occupants.in order to make 80% and 90% of the visitors satisfied, the required concentrations of carbon dioxide are 0.11% and 0.06%, required concentrations of total volatile organic compound are 243 μg/m3 and 76 μg/m3, and required per person outdoor airflow rates are 6.6 L/s and 19.5 L/s, respectively.Meanwhile, in order to make 80% and 90% of the occupants satisfied, required concentrations of carbon dioxide are 0.209% and 0.098%, required concentrations of total volatile organic compound are 583 μg/m3 and 228 μg/m3, and required per person outdoor airflow rates are 0.5 L/s and 14.1 L/s, respectively.

Abstract:Variable predictive model based class discriminate (VPMCD) method was introduced to roller bearing fault diagnosis, and a roller bearing fault diagnosis approach based on empirical mode decomposition (EMD) and VPMCD was put forward.Firstly, different feature vectors were extracted with EMD.Then, different working conditions and failures of roller bearing were distinguished by using VPMCD.Analysis results of vibration signals from roller bearing's normal condition, outer ring fault and inner ring fault show the effectiveness of the proposed approach in roller bearing fault diagnosis.What's more, comparative analysis results demonstrate that VPMCD algorithm gains more stable classification performance and better computational efficiency than artificial neural network (ANN) algorithm.

Abstract:Based on GPU high-performance parallel computation, a parallel acceleration of regular integration in boundary face method (BFM) has been implemented in CUDA (Compute Unified Device Architecture) programming environment.Comparative computations compared with traditional regular element integration were made on both NVIDIA GTX680 GPU and Intel(R) Core(TM) i7-3770K CPU.Numerical examples show that, a speedup of 8.3x has been achieved at the same level of accuracy.

Abstract:A 3D model of the angular contact ball bearing C36018 for satellite was established with Pro/E.Then, the bearing with solid lubrication coating was simulated in explicit dynamics method.Dynamic contact stress and kinematic state under different rotating speeds and axial forces were obtained.Then, comparison was made with a bearing without solid coated lubrication.The result showed that the stress amplitude of the parts increased with the increase of axial force and the time for the ball and retainer to rotate reduced.The stress peak frequency also increased with the increase of rotating speed, while it had no effect on the magnitude.In addition, the contact face with solid lubrication coating formed local distortion to avoid hard contact between parts.Therefore, the bearing could be effectively protected.

Abstract:According to the adjustable restraint parameters of an integrated child safety seat, the seat height, seatback angle and force limiter value of the seat belt were chosen as optimization variables.This integrated child safety seat has obtained a national patent.The values of injury criteria of the head, the chest and the neck were chosen as optimization goals.Approximate model of polynomial regression and multi-objective evolutionary algorithm were adopted to optimize the restraint parameters of the integrated child safety for the protection of 3-year-old, 6-year-old and 10-year-old child occupants.The results demonstrated that the effect of optimization was significant.Finally, an adaptive matching method for seats for 3~10-year-old children passengers was proposed on the basis of three optimal restraint parameters.

Abstract:This paper proposed an improved proportional resonant(PR) controller, which was applied to the permanent magnet synchronous motor control system.Compared with the traditional PI controller, it can not only make the whole control system save a tedious coordinates transformation, but also remove cross-decoupling compensation and feed forward compensation influenced by temperature and electrical parameters, thus simplifying the control strategy.Simulation and experiment results show that the introduction of the improved PR controller to permanent magnet synchronous motor control system can achieve zero static error with the AC input signal, ant the system has a strong inhibitory ability in low-order harmonic and designated harmonic.

Abstract:Molecular dynamic simulation was used to study the distribution of Re atoms in Ni and Ni3Al and its effect on the microstructure of Ni and Ni3Al.It was found that the content of Re markedly affected the formation of vacancies both in bulk Ni and Ni3Al.Doping Re at the Ni site, the damage on the Ni bulk was weaker than that on Ni3Al.The structures were stable when the content of Re was small in Ni.The damage became obvious when the content of Re increased.When doping Re at the Ni site in Ni3Al, the effect was more obvious.However, the damage on the Ni3Al bulk was very weak when Re atoms occupied the Al sites in Ni3Al.The effect became obvious as the content of Re was 1.0 % and the ratio of vacancy to atoms was about 1.0 %.Re atoms preferred the Al sites to the Ni sites in Ni3Al, and the damage of Re occupying the Al sites in Ni3Al was weaker than that occupying the Ni sites in Ni3Al.

Abstract:Hydrogen and oxygen permeation of Nafion 211 membranes (25 μm thickness) was evaluated under variable temperatures, relative humidity (RH) and gas difference pressure between the anode and cathode (P).The results indicate that the gas permeation rate in the Nafion 211 membrane increases almost as exponential form with the rise of temperatures and as linear form with the rise of pressures.However, the effect of RH on the hydrogen permeation seems to be more complicated.At constant temperature the permeability goes through a minimum at intermediate relative humidity (approximately 40% RH).Temperature and pressure have more conspicuous effects on the super-thin membrane permeability compared with the RH.

Abstract:The different land use plots (i.e., wasteland, pinewood land and grassland in this study) of red soil hilly region were selected as the research regions.On the basis of detecting the effects of land use type on the distribution properties of soil labile organic carbon and herb biomass, this research investigated the quantitative relation between soil labile organic carbon and herb biomass under the different land use types.The results showed that land use types had significant effects on the distribution of soil readily oxidized organic carbon(ROC), dissolved organic carbon (DOC), microbial biomass carbon (MBC) and herb biomass at plot scale, and all labile organic carbon components and herb biomass of grassland plot were higher than those of wasteland and pinewood land plots.Quantitative analysis showed that the soil labile organic carbon components, which had statistically affected the herb biomass of the three plots, were DOC (wasteland plot), ROC (pinewood plot), DOC and MBC (grassland plot).In addition, the influence of DOC on herb biomass in wasteland plot was generally through SOC.

Abstract:17-Estradiol (E2), a typical natural estrin, was chosen to study the mixed effect of Cd with natural estrins.The aim is to understand the impact of Cd on human health.Human breast cancer cell MCF-7 increase examination was used to examine the estrogenicity.The results showed that Cd had estrogencity, but E2 dramatically decreased its effect.Cell cycle analyses showed that Cd, E2, and their mixture all increased the ratio of cells in the DNA synthetic phase and therefore promoted cell proliferation.Cell proliferation pathway analyses showed that Cd, E2, and mixture significantly reduced the expression of ERα protein in the cell.The rivalry effect between E2 and Cd was mainly from the MAPK signal transduction pathway.E2 and Cd both promoted the expression of Ki67 protein and prolification-related protein, but the mixture significantly reduced the expression of Ki67.

Abstract:A method was introduced for hand posture recognition based on compressive sensing.Considering the limitations of a single feature, Zernike moment and HOG descriptors were fused to improve the robustness.Firstly, we constructed training dictionaries according to the characteristics, then the candidate target was expressed as a sparse combination of the corresponding training dictionary, and classification results were done through solving a l1-norm based optimization problem.The proposed method can take full advantage of each feature, which is robust to rotation, noise and varying illumination.Experiment results show that the algorithm is competitive to the state-of-the-art hand posture recognition methods, and is suitable for real-time application.

Abstract:To address the problem that the real-time multimedia I/O is the bottleneck of the transparent computing system performance, this paper proposed a multimedia I/O access control policy for transparent, called CAVIO (Classification and Aggregation-based Virtual I/O mechanism).CAVIO classifies I/O requests by their types to give the multimedia I/O a high priority, aggregates the small I/O to reduce the average path length and the network processing overhead, and carries out network transmission concurrently to improve the disk I/O throughput over network.The experiment results demonstrate that CAVIO significantly improves the multimedia I/O processing performance in transparent computing system.

Abstract:A supply chain network equilibrium problem with correlative multi-commodity with random demand was investigated,and multi-commodity with mixed transportation and uncertainty of market demand were considered.A stochastic supply chain network equilibrium model with mixed transportation of multi-commodity was proposed, and cross transportation costs and fines on the impact of supply chain network was analyzed.A projection and contraction method was applied to solve the proposed supply chain model.It is provedd to be convergent to the solution of the stochastic supply chain network equilibrium model.A numerical practical example shows that the model and the method are effective.It also shows that the projection and contraction algorithm is better than modified projection method and quasi-Newton method in solving the supply chain network equilibrium model.

Abstract:This paper studied the multilinear commutator of the multiplier operator, in which functions belong to Lipschitz space, Handy space or Herz space，and proved the boundedness property of the multilinear commutator.