Abstract:Laboratory tests were carried out to determine the material parameters of 10 densely graded cement stabilized crushed stone pavement base materials, which are of floating and frameworking aggregate structures with five (5) cement contents for each structure. Based on the test data, with consideration of actual conditions in highway construction, the anti-cracking properties of the materials were analyzed under changes in temperature and moisture by using the finite element method. Results of the analyses indicate that both the non-cracking ultimate temperature drops and the moisture losses deceases with the increase of cement content. For given cement content, the ultimate temperature drops and the moisture losses of frameworking materials are 19.9%~24.3% and 3.6%~6.8% higher than those of floating materials, respectively. The optimum cement content of the frameworking materials is 2% lower than that of the floating materials, while the ultimate temperature drops and the moisture losses of frameworking materials are 279%~294% and 109%~119% higher than those of the floating materials at the optimum cement content, respectively.

Abstract:The calculation methods of overall stability for HM and HW-shaped steel beams under uniform load on the upper flange and concentrated load on the lower flange are not included in current steel structure code. According to the results obtained with energy theory, with the impact of deformation before buckling on flexural-torsional buckling considered, the critical moment formula of biax-symmetrical HM and HW-beams was derived under the load mentioned above, and the effects of the load scale factor on critical moment were also summarized in this paper. The finite element method was used to verify the moment formula. When the load scale factor was less than 3，the result difference between the finite element method and the theoretical method was within 5%. In addition, the coefficient formula of equivalent critical bending moment for the steel beams under the same loading was put forward. The maximum error of this coefficient formula was less than 8% and the average error was about 3%.

Abstract:The influences of reinforcement corrosion on reinforced concrete beam failure modes are investigated. Experiments were carried out on 4 groups of the 21 reinforced concrete beams with different shear span ratio and different reinforcement corrosion degree. It is found that reinforced concrete beam specimens with the same longitudinal steel ratio and the same shear span ratio have three kinds of failure mode, i.e. bending failure, shear-compression failure and bond- shear failure along with the different corrosion extent of longitudinal and stirrups steel. Considering this phenomenon, and based on the experimental research and other related test results from literatures, a shear bearing capacity formula of corroded reinforced concrete beam that takes into account the effect of shear span ratio, corrosion ratio of stirrup and that of longitudinal bar, as well as the steel-concrete bond degradation, was established by utilizing the analytical concept of GB 50010-2010 code. Through the analysis and discussion of the critical conditions of failure mode transitions and the variation of general bearing capacity for the test beams, the analysis model of reinforced concrete beam failure transitions is proposed. Taking longitudinal reinforcement corrosion rate as the horizontal axis and stirrup corrosion rate as the longitudinal axis, according to the analysis model and considering the influence of shear span ratio and other factors to get the critical curve, the experimental results fit well with failure mode regions devided by the critical curve. The application of this model can make the preliminary judgment and control the damage form of the beam by different reinforcement corrosion rates.

Abstract:Pedestrian dynamic load has begun to play the critical role in footbridge design stage due to its construction fashion of long span and more flexibility. However, impeded by the stochastic nature of pedestrian loading, how to calculate the response of footbridge due to pedestrian walking appears as a tough problem for consulting engineers. To develop an accurate and practical method for the calculation of pedestrian induced footbridge vibration, a time domain based stochastic load model for pedestrian walking force is first proposed and expressed in parameters of human instantaneous walking gait, which is followed by an extensive investigation into the distribution law of pedestrian gait parameters through site tests. On the former basis, also illustrated in this paper is the procedure to integrate modal force due to pedestrian walking, as well as the framework to perform a mode superposition transient analysis for footbridges vibration under pedestrian loading. Finally, taking 43# Bridge as an example, the reliability and practicability of this methodology is validated by comparing the results from numerical simulation and from the experimental test, as well as by values determined in accordance to worldwide guidelines for footbridge design.

Abstract:In accordance with the consistent coupled method ( Consistent Coupled Method, CCM ) proposed by the author, and by combining the wind loads distribution by wind tunnel tests, the influence of structural dynamic characteristics of wind-induced vibrations for cooling towers under strong wind loads were investigated. For simplified structure models with different base frequencies and damping ratios, the response simulations of wind-induced vibration, such as background term, resonant term, cross term and wind-induced vibration coefficients, were performed. And then, the mechanism of wind-induced vibration for large cooling towers with interference effect was studied. From the simulations, some features of base frequencies, damping ratio and interference effect were found. The results in this paper are useful for both the promotion of the understanding of resonant vibration and the avoidance and control of this kind of vibration.

Abstract:A constant scallop-height tool path generation algorithm for triangular mesh surface based on the tool envelope surface is proposed. The algorithm firstly deduces the equation of tool envelope surface, and then the scallop curve can be obtained by the interaction calculation of the two neighboring envelope surfaces. Therefore, the accurate scallop-height can be calculated in the two steps of global searching and local searching. According to the result and the judgment criterion of the constant scallop-height tool path, the optimal CL point can be obtained. Finally, interference detection and processing is carried out for the current CL point. Experiment results indicate that the proposed algorithm is feasible. It can obtain constant scallop-height and shorter tool path without interference, and it can improve the quality and efficiency of machining.

Abstract:Mechanism synthesis of product development mainly depends on engineering experience and the application of mechanism at present. Randomness innovation and few solutions are common phenomena. In order to design new machines by utilizing patent resources, the Function Trimming Method of TRIZ was adopted to take advantage of patent information during concept design. Catalog Design was employed to cover exhaustively possible innovative solutions. The patent oriented and competitive patent circumvented process model of re-innovating mechanism synthesis was proposed on the basis of Trimming and Catalog Design. The application example, which obtained many solutions on the basis of trimming the existing patent, indicates that this process model can feasibly direct the mechanism synthesis in the innovative design of products.

Abstract:Along with the increasing size of database and the reduction of support threshold, the number of frequent patterns will grow exponentially, and the time and space efficiency of the FP-growth algorithm will greatly reduce. The cause of low efficiency was analyzed, and according to the analysis, a lattice-based algorithm for fast mining frequent itemsets (LFP-growth) was presented. The proposed algorithm divided a large lattice into many sub-lattices by using equivalence relation. Through iterativing decomposition of sublattices, frequent itemset mining in lattice was transformed into frequent itemsets mining in a union set of multiple sublattices. Experiments have shown that the time and space performance of LFP-growth algorithm is superior to that of FP-growth algorithm in mining large database.

Abstract:Aiming at the characteristics of the conceptual design of bus body structure, a bus body structure conceptual design and optimization system was developed, and a parameterized bus body structure conceptual model was constructed. With the model of the conceptual model as the template, the new bus body structure conceptual geometric model can be created and body size parameters can also be adjusted. This system can implement static stiffness analysis, low modes analysis, sensitivity calculation and optimization design for the body with automation process. Therefore, the body structure performance and lower order mode performance can be evaluated effectively. Finally, the paper showed a case of analysis. The case calculated the body structure stiffness and the low modes of a bus, and improved the stiffness and low modes by ensuring the quality of the body invariable, which improved the body structure performance, and realized the body lightweight. The case has verified the reliability and effect of the system.

Abstract:To address the shortcoming of control strategy in shore power products used in harbor at present, this paper analyzed the characteristics of PWM Converter mathematic model based on DQ rotating frame. The author put forward the modified multiple control strategy with the blend between repetitive control theory and Neural Network internal model control theory. The BP neural network was adopted as the estimated model and control of internal control, which can establish the precise model of the controlled target on line. Meanwhile, fast dynamic response, with no static error in output and good interference rejection, can be achieved. The experiments have verified that the output waveform is stable and accurate, the load adaptability is powerful and the dynamic performance is good.

Abstract:The power sector may have great influence on environmental performance, which has to be monitored and evaluated. Based on a DEA environmental performance evaluation model, this article utilized slack variables of input, desired output and undesirable output to build a normalized general performance evaluation model. The power exchange between areas makes input and output of the power sector unmatched and thus difficult for further calculation. To solve this, the static and dynamic model of environmental performance was proposed. It provided methodology for the further analysis on patterns of environmental performance in power sector and influential factors. The proposed models were applied to analyze the environmental performance of the power sector of 30 provinces in China from 2006-2010. The results have shown that provinces with higher consumption eco-efficiency often present higher generation eco-efficiency; the proportion of thermal power is a key factor to environmental performance of the power sector; the developed provinces and provinces with a low proportion of thermal power have better scores in relative eco-efficiency; the environmental performance of the power sector in China keeps improving during the investigation time period; and the development of environmental technology is the main contributor to environmental performance improvement.

Abstract:Phenothrin is an important insecticidal and acaricidal agent with certain toxicity. It is highly necessary to develop a rapid, sensitive and selective method for phenothrin assay. This article demonstrated a thermal initiation method to prepare molecularly imprinted electrochemical sensor, which selects phenothrin as the imprinted molecule. Some factors affecting the preparation of the molecularly imprinted electrochemical sensor were optimized and its sensing performance was evaluated. The sensor exhibits a high sensitivity and selectivity towards phenothrin.The response current depends on the concentration of phenothrin at the range of 1.0 ~100.0 μmol/L, and the detection limit is 2.0 × 10-7 mol/L. The sensor has been applied to the analysis of phenothrin in the water of Xiangjiang River with a satisfactory recovery rates ranging from 95.62% to 103.19%

Abstract:The UV-vis spectrophototometer was applied to investigate the aging process of red carminic acid, under alkali, acid, UV light, heat, oxidizing atmosphere and reducing atmosphere treatment. The results have shown that carminic acid is tolerable to acid and UV light. It is sensitive to alkali and heat. Poor stability is shown in oxidizing and reducing atmosphere. UV-vis spectrophotometry is a simple and rapid way for the study of dye aging.

Abstract:AtWNK9 is a member of WNK（With no lysine kinase） family in Arabidopsis, and its function remains unclear. In this study, the protein structure, subcellular localization, promoter elements and expression pattern of AtWNK9 were analyzed by using bioinformatics and biological methods. The results have shown that AtWNK9 is located in the nucleus. It is expressed higher in the root of Arabidopsis, and its transcriptional level is strongly induced by abiotic stress treatments such as ABA, NaCl, glucose, heat and cold. These results indicate that AtWNK9 might be an abiotic stress responsive gene and involves in root development.

Abstract:A two-dimensional finite element model was used to analyze the deformation behavior of the magnesium powder in the multi-pass cyclic extrusion-upsetting (CEU) bulk mechanical alloying process, and the distributions of velocity field, effective stress field and equivalent strain field of the sample during CEU process were obtained. The simulation results indicate that powder particles flow vertically during extrusion and flow transversely during upsetting. The intense alternate shearing deformation was attributed to the inconformity of the flow rate and the flow direction during the cyclic extrusion-upsetting process; and the lord deformation region of the sample was located three according compressive stress state. Inhomogeneous deformations exist in the sample and the uniform region of equivalent strain increases with the increse of the CEU processing numbers. In addition, The experimental results of cyclic extrusion-upsetting process for three times showed that the banded structure was generated in the sample, and the intense shearing force broke the initial oxide and the inner hole of the sample, so the intense densification effect was formed during the CEU process. The relative density was measured to about 0.98 and the favourable metallurgical combination was obtained.

Abstract:The preoxidation of mesophase pitch fiber was simulated by means of thermo gravimetric analysis. Then, the radial deformation behavior and self-bonding process of pitch fiber on hot press were studied through thermal mechanical analysis. And the microstructure of self-bonding pitch fiber boards and self-bonding carbon fiber boards was analyzed with scanning electron microscopy. When the oxidation weight gain was 2.1%, the radial deformation rate of pitch fiber was 36%, which indicated that the pitch fiber was easy to be processed. Moreover, the surface of self bonding board was smooth and the contact surfaces of fibers were closely bonded. When the oxidation weight gain was 1.3%, the pitch fiber was molten for the destroying of microcrystal orientation and unable to be processed. When the oxidation weight gain was above 3.3%, the radial deformation rate of pitch fiber was small and the self-bonding ability of pitch fiber was poor.

Abstract:By considering the “bad” output, we used Malmquist-Luenberger index to estimate the total factor productivity, and then studied the non-linear relationship between technological progress and FDI on the basis of the panel smooth transition model. The result has shown that there is a nonlinear relationship between technological progress and FDI at the early stages of economic development. The technology gap between our country and investing countries is too large, the so-called "FDI technology spillover effect" does not appear, and FDI is not good to technological progress. With the gradual development of the economy, the negative effect of FDI on technological progress weakens, then turns positive, and the "FDI technology spillover effect" emerges when the economy develops to the threshold value. In addition, there is a threshold effect of human capital and financial development. Human capital has a negative effect on technological progress in the early time period, and then it becomes positive with the development of the economy. Fnancial development has a positive effect on technological progress in the early time period, and then, it becomes negative with the development of the economy.

Abstract:By combining KMV model and DCC-MSV model, a sectors' credit risk correlation analysis model was constructed to explore the credit risk contagion effects between the five sectors. Having ruled out the sectors whose field involved is too miscellaneous and main business is not prominent, the number of listed companies in each sector is taken into consideration, and eventually the research object is determined to consist of the transportation warehousing sector, information technology sector, the retail establishment sector, the real estate sector and the community services sector. The empirical results show that the credit risk contagion effects between the sectors are significantly greater than 0.5 and have an upward trend in the turbulence, which further confirms that there indeed exists significantly incremental credit risk contagion between different sectors in the tertiary industry, and also illustrates that the degree of contagion is strengthening. Meanwhile, the empirical results also demonstrate that the credit risk contagion effects between the transportation warehousing sector and the other four sectors was marked, which may be due to the fact that the transportation warehousing sector, as the basic sector, significantly impacts on other sectors. This article also points out that the credit risk contagion effect between the real estate sector and the community services sector is also significant, probably because both sectors share the credit risk contagion affecting factors, that is, the transportation warehousing sector. Besides, the article manifests that the credit risk contagion effect between the wholesale and the retail establishments sector and the community services sector is the strongest and relatively stable. The possible reasons can be that both of the two sectors are influenced by the transportation warehousing sector, and that there also exists a strong affinity between them.