Abstract:A method to solve sulfate corrosion damage of recycled aggregate concrete(RAC) from the wet-dry cycles test~used to study material performance degradation rules for all RAC(r=100%)and RAC with different recycled aggregate replacement ratio ( r)under sulfate environments 3%,5% and 10%(by mass) Na₂S0₄. The results show that:①linear dilatation ratio(ΔL)of RAC increases with the increase of r, and the change trend of relative dynamic modulus of elasticity ( E_r) were consistent, and the attenuation rate for E, increases with the decrease of r under different r and 5 %(by mass) Na₂S0₄;②the attenuation rate of E_r and the ΔL for the all RAC increase with the increase of the level of Na₂S0₄ solution concentration;③the specific value of E_max( r ) /E, close to 1.07. At the same time, the damage computation model of RAC in sulfate environment was put for- ward based on test results.

Abstract:Taking the second一term engineering of Jing一Hua freeway as research object, laws of sub-grade settlement under dynamic loading through analyzing the engineering properties of subgrade-fill-ing was studied taking tests on the spot and laboratory experiments and simulating with the finite el-ement software ANSYS. The test results show that the subgrade settlement is affected by both the speed and load cycles; the subgrade settlement decrease with the depth of subgrade increasing;extremal point of subgrade settlement is below the cyclic loading and the maximum settlement is about 9.624 cm.

Abstract:It was supposed that steel bars in concrete begin to corrode when concrete cover is entirely carbonized, and the time of corrosion initiation was calculated by carbonation model of concrete under stress proposed through test study. Diffusion coefficient of O₂ was educed with diffusion coefficient of CO₂ in concrete under stress. The effect of stress on corrosion rate of the steel bar was confirmed by experiment study.Based on the theory of corrosion electrochemistry, prediction model for corrosion of steel bars in concrete under stress before corrosion cracking was presented. The computation model was well verified by a practical engineering project. Significantly severer reinforcement was observed in higher stress concrete zone. It can be contributed to earlier corrosion initiation time and higher cor-rosion rate for steel bars in concrete under stress.

Abstract:The research on the sedimentation of the foundation in high-speed railway has been one of the concerned problems in civil engineering .Based on a railway foundation project in Tianjin; this paper puts forward a new method replacing the soft foundation with the lightweight foam soil to deal with the soft foundation. In this paper we also use ANSYS software to simulate and calculate the foun- dation which is replaced by the lightweight foam soil and get the sedimentation curves of the founds- lion under the different thickness of the lightweight foam soil. Through the comparison, we get the most economic and reasonable thickness which also meets the railway standards and it has practical guiding significance to this project.

Abstract:In this paper, design specifications of circular steel tubular welded States and EU are studied thoroughly. With detailed analysis cation, failure mode and ultimate bearing capacity of joints, and comparison joints in China, United about the joints classifi- the design bined with practical examples. The results show that the wall thickness proposals are presented tom- increased is one of the most effective way to improve the joint strength and the joint strength can be improved by increase the dia- metrical ratio between the branch pipe and main pipe.

Abstract:The random seismic loading and structural hysteretic restoring force model commonly used were summarized in this paper. The analysis method commonly used for random vibration of nonlinear systems, including the diffusion theory method, the stochastic averaging method, perturbation meth-od, the moment truncation method,digital simulation method and the equivalent linearization method were discussed. The theory, development and the application of the method of equivalent linearization in hysteretic structures with random seismic response analysis were summarized. The results showed that the equivalent linearization method, especially in recent years, the local equivalent linearization method and no parameters equivalent linearization method,random seismic response of a hyste一retie structure can be analyzed in a very simple and practical way. By exploring random equivalent lineari- za-lion method of error analysis and correction, we can get the conclusion that the use of equivalent lineariz一ation method can lead to highly accurate results. This paper is of a certain reference value for the seismic reli一ability of reinforced concrete structure analysis method.

Abstract:The GA-BP neural network and the orthogonal test design method were used to analyze the sensitivity of affecting factors of the bearing capacity of PHC piles in a area of Fujian province, in which the pile's bearing behavior belongs to end bearing-friction type and the pile shaft teems with mucky soil and residual cohesive soil layers primarily. The main conclusions are as follows ; ① accord- ing to priority,the sensitivity order of the influence factors on vertical bearing capacity of the single pile are pile diameter,the weighted average of pile shaft resistance valuea,resting stage,pile length, buried depth of pile, permeability coefficient and final pile static pressure; ②the contribution of pile diameter and pile shaft resistance value to vertical bearing capacity of the single pile is the largest, resting stage is in the next place which influence is also very notable,so the pile test time should not be in advance blindly,otherwise the pile test results would be affected objectivity.

Abstract:Abstract:This article takes the construction of the Route industriekultur in Germany and Loft oJin- ding 1919 cultural and creative industrial park in Kunming for example to analyze and to explore transformation and influence of industrial wasteland on city space under the conditions of current mar- ket economy. Researching on the spatial updating of industrial wasteland weather can be bred a new innovation in urban design and activate and rejuvenate the old industrial district, and promote the de- velopment and the perfection of city function including city periphery. All above are useful for not on- 1y the pollution treatment and ecological restoration around the old factory, but also useful for the ra- tional utilization of land resources in new period.

Abstract:This paper briefly introduces the situation of Greening Exposition of Zhengzhou and its or- ban gardens. Then this article analyses the main characters of landscape design of urban gardens and talks about the content and means of cultural expression in urban gardens landscape design. Through the surveys and observation, we can know that landscape design of urban gardens has distinctive char- acteristics and rich content. Based on the uncovering of city culture and applying of concept and tech- pique of modem landscape design,urban gardens which have regional characteristic and culture con- notation are created by means of rich design language and a variety of cultural expression which can express city information and shape city characteristics.

Abstract:Based on the typical weather conditions of Chongqing city, the changing of building load varying with window-wall ratio has been analyzed. Combining with the factors of lighting, beauty, and construction, and utilizing the weight method, the window一wall ratio of eastern and western within 0. 342 to 0. 352 is excellent, and within 0. 375 to 0. 385 of southern and northern is excellent. By shading experiment result, and combining with the factors of scalar lighting, beauty, and construc- lion, the width of shading device within 0. 6 to 0. 8 meter is excellent.

Abstract:In this study we pursued regional air quality modeling over Hebei and surrounding areas and analyzed the regional contributions to the PM_2,5,concentrations and light extinction coefficient. The re- salts show that the largest contributor of PM_2,5 is Hebei province with the number of 67.9%,followed by Shanxi (7.38%),Henan ( 6. 95 %),Shandong (5.48%)and Beijing一Tianjin(1.09%).)n the modeling period, the contributions to the light extinction coefficient are 64.7% for Hebei, 11. 2% for Shanxi,3.5% for Shandong, 4.8% for Henan and 1. 1% for Beijing-Tianjin.

Abstract:This paper discussed the probability and variability risk of water inrush from No. 9 coal seam floor during mining under high pressure. The grey一risk model is used to calculate and evaluate the risk base on the statistical data about water levels of existing bursting points, maximum water yield and specific capacity discharge. It is concluded that the risk is very great to mine the lower group coal seam under the high pressure in Guoerzhuang mine. The author proposes that the measures, including mining by areas and mining一detecting, should be taken in advance to reduce accident emergency.

Abstract:Coal measures sedimentary environment is an important factor affecting the coal bed meth- ane(CBM) reservoir. The Carboniferous Taiyuan Formation and the Permian Shanxi Formation are the main coal-bearing strata in the study area. The analysis showed that the barrier island-lagoon -the tidal-flat and shallow epicontinental sea carbonate platform deposition are mainly faces in Taiyuan Formation. The roof-seam-floor sedimentary assemblage respectively represents the la- goon face, the tidal flat face and the tableland face. Shanxi Formation is shallow water-delta system which is the river controlled. The tool-seam- floor sedimentary assemblage respectively repre- sents the swamp face-swamp face-swamp face or the natural levee face-the swamp face-marsh face. The sedimentary facies of the Shanxi Formation is more beneficial than Taiyuan Formation for the enrichment and preservation of the CBM reservoirs.

Abstract:During the process of mining, dip angle and depth when the coal seam the surface deformation was mostly influenced by seam roof and floor strata were three-dimensional finite element numerical simulation, this paper of the flat or gently inclined seam, inclined coal seam and steeply under certain conditions. Through studied the influence of the mining inclined coal seam on the founda- lion deformation of the overlying structures. gle γ、β

Abstract:Based on method of theory analysis and numerical simulation, feasibility analysis on upward mining on N0. Ml l coal seam in the first mining area of Jike colliery in Yunnan province was stud- ied. The results showed that the height of caving zone after mining is 8. 47 meters, and height of frac- tore zone is 21. 132. 4 meters, the M9 coal seam is in the fracture zone of M11 coal seam after min- ing. Numerical simulation results indicated that the vertical stress in M9 coal seam is obviously re- doted. The maximum height of fracture zone is 26 meters. And the relief effect is significant. It is feasible to make Ml l coal seam as the operation layer for M9 coal seam.

Abstract:Taking the actual examples, the author pointed out that the misunderstanding of the broken circle in the process of applying, The authors came to the proper use of the three principles of the bro- ken circle method as follow ;(1)breaking the smallest circle; ( 2 ) the broken line can not be re- used, (3)only break the arrow that stream into the arrow. Mastering the three principles of the bro- ken circle analysis method could not only make the engineering staff and teachers, students use cor- rectly the broken circle method to distinguish the double-arrow network critical path reference, but also extend the application of broken circle method.

Abstract:This paper put forward a new word dictionary and query algorithms for network courses an- swering system, learn from the existing three types of sub-word segmentation algorithm of the advan- tages and overcome their shortcomings, the sub一word dictionary consists of two parts which are pro- fessional dictionary and the basic dictionary, the designed algorithm in the word dictionary search, searches firstly for the basic dictionary, searches secondly for the professional dictionaries. ff finds words in the basic dictionary, the algorithm do not continue to search for specialized dictionaries, the algorithm greatly reduces the time complexity. In addition, word dictionary is designed by two-di- mensional index of words and word matrix, and a table of all the ordered sequence of words, word within the code as a subscript in the matrix, the ordered sequence table using a sequential search which could reduce the number of dictionary search.

Abstract:This paper investigates the effective combinations of classical PID controllers and emerging intelligent technologies for industrial projects. It analyses the evolution of fuzzy controller Design methodology. Based on the analysis, structures and methods that combine both approaches are pro- pose and considered.

Abstract:Taking a two degree of freedom car vibration system as a research object, this paper solved the mathematical model and differential equation of the vibration system through analyzing the vibra- lion form and loading condition of automotive suspension. The corner B and centroid displacement X of automotive suspension were solved in the Matlab program. In addition, Matlab software gave the im- age result of response of vibration system. Both the brief solution program and the accurate image data which corresponded with vibration theory showed the feasibility and superiority during solving these re- sponses of mechanical vibration system. Thereby, this research provided an easy and effective method to solve the response of eeneral mechanical vibration system with.

Abstract:The hydraulic vibration system of two freedom hydraulic vibration roller was the research object in this paper. Three horizontal subsets were selected in every experimental factor which was ob- tained from the three一dimensional orthogonal experiment to obtain the samples of the training neural network. The mathematic model was built by artificial neural network theory and the optimum tom- bined parameters of horizontal subsets were established by means of Mtalab simulation. The results show that target value of the optimum combined is 0. 552 3 and the stiffness of the system is 3. 3 N/ mm through the artificial neural network mathematics model. This meets the project requirement be- cause of the relative error of 10.46% between experimental results and experimental target value.

Abstract:Based on Hall's three-dimension theory, a three-dimention pattern of risk management which was combined by time domain, targeted domain as well as role domain was constructed. The con- ception of analyzing risk not only from entire system but also from a single element was proposed. A mufti-level fuzzy comprehensive assessment model of none production process and risk targets were es- tablished in this paper, which can help managers to identify the risk state with fuzzy information.

Abstract:By modification, TiO₂ shows relatively high photocatalysis activity in visible light range, which changes the characteristics of only showing relatively high efficiency in UV light irradiation. This paper reviews the researoh developments on modification of nano-TiO₂. It points out that bandgap can be decreased and visible light responsiveness and quantum efficiency of nano-TiO₂ can be increased via element doping, noble metal modification, polymer modification, coupled semicon- ductois, dye sensitization and so on. The analysis suggests that effect of visible light photocatalysis of modified nano-TiO₂ prepared in the lab has already been relative ideal. The future development di- rection is to solve the difficulty of recovery and easy operating in engineering.

Abstract:The binding energy of a hydrogenic impurity in self-assembled double quantum dots was calculated via the finite-difference method. The variation of the binding energy with stricture param- eters, the donor position and external magnetic field were studied in detail. The results show that the binding energy has a complex behavior due to the coupling between the two dots; it is much larger when the donor placed in the center of one dot than in the other positions; and the external magnetic field has different effects on the binding energy for different quantum dot size or lateral confinement.

Abstract:Beam diagnosis was used to measure the laser radius and transmit direction when the CO₂ laser passed through the DC TIG arc and the influence of laser defocus and the arc position laser on the spot were studied, and the reflection angle was calculated. Results showed that Facula radius was enlarged for 0 and+10 mm laser defocus because of arc plasma's "Negative Lens F.fl'ect",and facula radius was reduced while 1~10 mm defocused. Since arc's refraction as a "Prism",laser's trana- mission direction was deflected to cathode for a small angle of 0. 80. Facula was elliptical for laser in- cidenee near are cathode.

Abstract:The 3 edible coatings of 15%wheat gluten, 2.5%chitosan and 15%corn zero were made complex formulation with the method of the simplex lattice mixture design of the regression de- sign method of the mixing material. By comparing the indices of weight loss rateyolk index, albumen index and the value of albumen pH, the results show that the optimal values of 15%wheat gluten, 2. 5%chitosan 15%corn zero in the nuxture are 58%~79%,17%一40%,2%一18%re- spectively. The results provide the technique basis for the new edible coatings of eggs.

Abstract:The effect of weak-discontinuous interface on the periodic inner cracks in a laminated functionally graded composite is analyzed under anti-plane shear loads. Fourier transformation and dislocation density functions are employed to reduce the solution of the mixed-boundary value prob- lem for Hilbert- The effects of the type singular integral equation, which are solved by I,obatto-Chebyshevtechnique. FGM nonhomogeneity, the layers thickness, the distance between of cracks and the weak-diccnntinunua interface_ crack snacine on the fracture parameter are discussed in detail.

Abstract:In many practical problems, we must break through the finite interval of integral and the boundedness of integrand function, and consequently we get two forms of improper integrals; the im- proper integral in an infinite interval and the improper integral of an unbounded function. Because im- proper integrals,related to convergence, therefore, the determination of convergence and diver- gence of improper integrals are very important. This work discusses a new logarithmetic criterion for improper integrals, and proves that the new logarithmetic criterion is more precise than the old logari- thetic criteria.