bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Measurement of Grass’s Moisture Content with Microwave Oven Method
Authors: Feng Yan , Shen Qing Qing , Chen Li Li , Luo Shu Ling , Jiang Guang Biao , Zhang Dang Quan , Luo Ying She
Published: December 2014

In the process of working, storage, finished fodder acceptance and the preservation process of grass materials, the moisture content of forage is a very important indicator. The blast oven drying method has been generally adopted in the measurement of moisture content. The related experiment showed that the microwave oven method for grass moisture content measuring improved 200-400 times in the efficiency compared with blast oven drying method. The microwave oven method was accurate and easy operating. So, we can conclude that microwave oven method is a viable method for measuring the moisture content.
Design of the X-Band Frequency Source Based on the Multiplying Technology
Authors: Zhao Shuang , Liu Yun Qing
Published: December 2014

The phase noise performance of frequency source has a direct impact on the target measurement such as the adjacent channel interference of the electronic system, the transmission quality of information, the resolution of radar. In this paper, we achieved an X-band high stability, low phase noise frequency source which based on the DDS combination with frequency doubling technology. The test result shows that when the output of the frequency source is at 8.544GHz, the phase nosie is-103.58dBc/Hz at 1kHz and-101.94dBc/Hz at 10kHz.
The Application of Information Instructional Design in Graduate Courses Teaching
Authors: Zhou Ling
Published: December 2014

With the increasing popularity of network technology and communication technology, networks are gradually penetrated into the field of education, breaking the time, space and geographical constraints, to achieve a high degree of sharing of teaching resources. Information instructional design rooted in the practical application of instructional design. In the course of postgraduate training, to encourage teachers to apply information technology instructional design, not only to meet the needs of graduate professional knowledge content independent learning and collaborative learning, but also to give students a useful design tool, to deepen the understanding of teaching content. Finding and solving problems in the process of gradually develop their practical ability to innovate.
Synthesis and Photochromic Properties of Diarylethene 1-[2-methyl-5-(4-trifluoromethylphenyl)-3-thienyl]-2-[2-methyl-5-(3-fluoro-4-chloro)phenyl-3-thienyl]perfluorocyclopentene
Authors: Xue Dan Dan , Zheng Chun Hong , Pu Shou Zhi
Published: December 2014

A new unsymmetrical photochromic diarylethene compound, 1-[2-methyl-5-(4-trifluoromethylphenyl)-3-thienyl]-2-[2-methyl-5-(3-fluoro-4-chloro) phenyl-3-thienyl] perfluorocyclopentene (1o) was synthesized, and its properties, such as photochromism and fluorescence properties in solution as well as in PMMA amorphous film, were investigated specifically. 1o exhibits good photochromism and fluorescence upon alternating irradiation with UV light and visible light (> 510 nm) in hexane and a PMMA film.
The Study of the Effects of Synthesis Process on the PAE Curing Effect
Authors: Wang Pei Pei , Zhao Chuan Shan , Han Wen Jia , Jiang Yi Fei
Published: December 2014

By changing ther factors of synthesis process of PAE, discussed the effects of synthetic conditions on the PAE curing, and through electron microscope analysis methods, the curing mechanism of PAE is preliminary discussed.When the ratio of DTEA/AA was 1:1.05,the dry and wet strength of paper before and after curing achieved the best value.when the dosage of p-toluene sulfonic acid is 1.5%, the PAE can achieve best effect.the best ratio of PPC and epichlorohydrin is 1:0.7.
Research and Application of Solid-Solid Phase Change as Energy Storage Materials
Authors: Wang Hua Li , Liu Shao Jie , Zhao Feng Qing
Published: December 2014

Latent heat storage is one of the most efficient ways of storing thermal energy. Compared with other kinds of PCMs, solid-solid PCMs have obvious advantages and have drawn more attention from the public. This paper reviews previous work on solid-solid PCMs. The advantages and disadvantages, as well as the preparation of three kinds of solid-solid PCMs were discussed. The problems associated with the application of PCMs with regards to the material and the methods used to contain them are also discussed. It is clear that solid-solid PCMs are promising, but possess the disadvantages as long phase transition time, low thermal conductivity, complexity and high cost. Therefore, there still much to do for solid-solid PCMs towards practical application in the future.
Relationship between Surface Roughness before and after UDR Treating
Authors: Li Li , Li Wei , Li Tao
Published: December 2014

A series of samples which have different surface roughness made by 45 steel were treated by Ultrasonic Deep Rolling (UDR), influence of original surface roughness on UDR effects, such as surface profile, surface roughness and residual stress, were studied. Results shows that surface roughness was reduced substantially through UDR treating and lager the original surface roughness, larger surface roughness and surface residual stress induced by UDR treating.
The Properties and Enhanced Photocatalytic Behaviour of TiO2-RGO Nanocomposites
Authors: Wu Fang Jun , Liu Wei , Mai Jia Wen , Qiu Jie Long , Zhang Shu Ting , Zhou Wu Yi
Published: December 2014

TiO2-Graphene nanocomposites were prepared by a wet chemical method and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis). The nanocomposite demonstrated nice photocatalytic activity for water reduction to produce hydrogen. The optimal graphene content was found to be 10 wt%, giving a Hydrogen-production rate of 13.2 mmol∙h-1∙g-1, which significantly exceeded the rate observed on pure TiO2. This high photocatalytic H2-production activity is due to the deposition of TiO2 nanoparticles on graphene sheets, which act as an electron acceptor to efficiently separate the photogenerated charge carriers.
The Impact of Pre-Heating on Pressure Behavior in Tapered Cylindrical Die in Pultrusion of Large-Sized Composite Rods
Authors: Grigoriev S.N. , Krasnovskii A.N. , Kazakov I.A.
Published: December 2014

A mathematical model to describe the pressure distribution in a thermoset large-sized composite rod as it travels through the pultrusion die is developed on the basis of Darcy’s law. A finite-difference method is employed to solve the governing equations of three-dimensional axis-symmetric cylindrical die geometry. The influence of pre-heating on pressure rise inside a cylindrical die inlet is investigated. The present model may be utilized to obtain the optimal linear taper angle for die inlet and process conditions to achieve maximum possible pressure rise in the die inlet.
Influence of Stacking Fault Energy on the Grain Size of FCC Metals Fabricated by Accumulative Roll Bonding Process
Authors: Jamaati Roohollah , Toroghinejad Mohammad Reza
Published: December 2014

In this study, the effect of stacking fault energy on the grain size of aluminum, copper, and brass fabricated via accumulative roll bonding (ARB) process was investigated. Evolution of microstructure of the samples was investigated by transmission electron microscopy (TEM). It was found that occurrence of the recrystallization (both continuous and discontinuous) in the copper and brass led to the formation of nanograins with mean size of 80, and 40 nm, respectively; while, the mean grain size of aluminum was 250 nm. Differences in microstructural evolution during processing of aluminum, copper, and brass was related to their stacking fault energies (SFEs). When the SFE decreased, grain refinement occurred more easily and the measured grain size was smaller.
Surface Modification of Broaches from the Powder High Speed Steels Applied to Processing of Aviation Products from Heat-Resistant Alloys
Authors: Grigoriev Sergey Nikolaevich , Cherkasova Natalia , Filatov Pavel , Vereschaka Alexey Anatolevich
Published: December 2014

This paper considers an approach to improve durability of broaching tools made of high alloyed powder metallurgical high-speed steels by complex treatment which includes ion nitriding and following deposition of wear-resistant coating (Nb, Ti,Al)N using two-stage vacuum-arc discharge. Broaching tools complex hardening conditions which provide minimal wear rate when machining heat-resistant nickel alloy Inconel 718 used for turbine discs are defined.
Options for Forming of Nanostructured Surface Coatings
Authors: Rusinov P.O. , Blednova Zh.M. , Chaevsky М.I.
Published: December 2014

The possible technologies of formation of nanostructured surface layers: a method of thermal mass transfer in a high temperature gradient; the combined method, comprising plasma nitriding a cathode in a low pressure and deposition of titanium nitride in a single process cycle; combined method comprising an ionic nitriding and high frequency deposition of chromium carbide by pyrolysis of organic chromium compounds in a glow discharge plasma are considered. The possibility of formation of nanostructured layers is shown. Examples of the practical use of these technologies are given. The tests found that the use of the combined coating nitriding + TiN increases cyclic durability of machinery parts in contact loading conditions and corrosive environments on the two orders, providing a specified level of reliability and combined nitriding + CrC coating on steel С1050 allowed to reach values ​​of the fatigue limit under Impact NaCl 400 MPa.
Micro- and Nanostructure of Titania Coatings Modified with Functional Ceramic Nanoparticles
Authors: Fomina Marina Alekseevna , Rodionov Igor Vladimirovich , Korolev Albert Viktorovich , Fomin Aleksandr Aleksandrovich
Published: December 2014

The article describes prospective nanostructured titania coatings modified with functional ceramic nanoparticles and obtained on surface of titanium items. Consistency changes of morphological characteristics and crystalline structure, physico-mechanical properties of experimental titania coatings obtained by the combination of oxidation and surface modification with ceramic nanoparticles during induction heat treatment are defined.
Non-Destructive Testing for the Evaluation of Pozzolanic Mortar Reinforced to Corrosion
Authors: Hamadache M. , Mouli M. , Dif F. , Bouhamou N. , Benosman A.S.
Published: December 2014

Our work aims to studying the addition of the natural pozzolan located in Beni Saf (Algeria) at non-destructive testing for the evaluation of pozzolan mortar reinforced to corrosion. We chose to study this natural addition because of its low cost and its pozzolanic reactivity. To do this, we have carried out tests on mortars made to Portland cement CEM I 42,5 N and substituted by weight based percentages of different natural pozzolan (10%, 20% and 30%). We have measured the corrosion potential and the corrosion speed of different deadlines. The results indicated that is it possible to highlight the beneficial effect of this addition. The analysis of achievements shows that the addition of the pozzolan in optimal quantities has the following advantages: protection of reinforcement against corrosion and increase the resistance against the sulfate attack (5% Na2SO4).
Evaluation of Friction Coefficient by Ring Compression of Magnesium Alloys
Authors: Ruan Li Qun , Maeda Akihide , Ezaki Shunsuke , Shen Shirley
Published: December 2014

Magnesium alloy is known for its light weight and high strength. Due to the desirable properties, Magnesium alloy is required in the fields such as transportation from the energy-saving point of view. The development of forming methods is especially highly expected. In order to manufacture productions of high dimensional accuracy with good surface finish without defects, it is important to evaluate tribological characteristics of forging of Magnesium alloys. In this paper, the friction coefficients were measured by the ring compression test. It compresses a ring specimen between parallel tools and is the method for the friction coefficient by the rate of change of the inside diameter. The friction coefficients of several kinds of Magnesium alloys have been evaluated depending on temperature, compression speed, and the kind of the lubricant here.
Residual Bearing Capacity Numerical Simulation and Theoretical Analysis of H-Shaped Steel Column Impacted under Different Axis Pressure
Authors: Bai Yan , Wang Rui , Cui Juan Lin
Published: December 2014

H-beam is usually used as column structure of single industrial workshop, steel column will inevitably encounter lateral impact of lifting weights or factory vehicle in the process of daily production, causing its defects in material and geometry, thus the change of axial bearing capacity.This aratical takes H-shaped steel column of a factory as the research object, establishes its residual bearing capacity theory of finite element analysis model in different situations under the impact using ABAQUS software platform, discusses the load parameters analysis in axial force-impac and Launches the functional relation between axial compression ratio and impact energy, providing a basis for assessing the residual loading capacity of such members after the impact.
The Analysis of the Stability of Elastic Bending Simply Supported Beam Steel Artifacts under High Temperature
Authors: Han Yu Lai , Cui Dan An , Jiao De Wei , Cai Zuo Hua , Li Yan
Published: December 2014

This paper applicate steel bending member in-plane is bending performance calculation formula that at the normal temperature steel structure under the action of uniformly distributed load and derived rules of calculation method of in-plane bending performance that steel bending member under the high temperature , the steel bending member in the practical example should be analyzed by the finite element software ANSYS, through the analysis and verify the accuracy of the calculation method that the steel structure bending member under uniform distributed load in-plane bending performance
Dominant Modals of Wind-Induced Vibration Response for Spherical Kiewitt Cable Dome
Authors: Wei De Min , Li Di , Liu Ya Qing
Published: December 2014

Correlation coefficients of mode shape between higher frequency modes and lower frequency modes are given. Then 17 high modes were initially selected as the dominant high modes in the analysis of wind-induced response, and cumulative mode correlation was used to judge the rationality of the method of selecting dominant high modals, so dominant modals of wind-induced response analysis are constructed. Based on these, the wind-induced vibration response of spherical Kiewitt cable dome was analyzed in frequency domain using CQC method. Through analyses of computational results, it is found that the selecting method of dominant modals by using the mode correlation coefficient can be applied in frequency domain analysis for wind-induced vibration response of cable dome structures. If the first 100 modals are considered into the analysis, the computational results obtained will be high precision.
Experimental Research on the Behavior of Concrete Columns with Chemical Bonded Reinforcement under Eccentric Compression
Authors: Zhang Jian Rong , Chen Gang , Geng Yao Ming , Chen He
Published: December 2014

Chemical bonded reinforcement is widely used in structural rehabilitation, retrofitting and strengthening. Pull-out test of bonded anchor in concrete block was widely used in research but it cannot reflect the practical behavior of bonded reinforcement in structure. 6 RC columns in which longitudinal reinforcements overlap with chemical bonding technique were tested under eccentric compressive loads. The failures of some columns were caused by weak bonding capacity while most were caused by yielding of steel. The failure mode depends on the overlap length of bonded reinforcement. The ultimate load, deflection curve and cracking situation of tested columns were similar with usual RC columns, but the values of rigidity were influenced by bonding strength and anti-sliding stiffness of anchorage. The mechanical properties of concrete column with chemical bonded reinforcement were also influenced by bonding construction quality.
Research of Stability of Cylindrical Steel Silos with Lap Joints
Authors: Liu Zhen Hua , Wang Tao , Wang Xiao Bei , Shan Hong Zhu
Published: December 2014

Steel silos are commonly constructed by welding together a large number of curved steel panels with lap joints.Where the lap runs horizontally around the silo circumference, the lap connection causes a local eccentricity in the line of vertical thrust in the shell wall. This eccentricity induces high local bending stresses, which are detrimental to the stability of the structure. This paper chooses a flat-bottom squat steel silo as the research object to analyze the stability of lap-jointed steel silo by comparing with a butt-jointed steel silo. By stressing loads calculated according to Chinese code for design of grain steel silos, considering two load cases including axial compression only and combined axial compression and internal pressure, this paper performs numerical analysises including linear buckling analysis, geometric nonlinear elastic analysis and geometrically and materially nonlinear analysis to study the effects of material nonlinearity and lap joint on stability.
The Finite Element Analysis of a New Type Reinforcement Form of Light Steel Ceiling
Authors: Zhang Zhuang Nan , Tan Zhen Dong , Li Guo Chang
Published: December 2014

This paper puts a form of reinforcement with used finite element methods to carry on the numerical simulation of a new type reinforcement form of light steel ceiling. Compared with the ordinary ceiling, the new reinforcement form of light steel ceiling can greatly improve the capacity of the ceiling sideways resistance with the overall strong stiffness from the simulation results.
Analysis Theory of the Bearing Capacity and Deformation Process of Load-Bearing Column Subjected to Fire
Authors: Han Jin Sheng , Chu Ke Wei , Lv Gao Chao , Li Shen
Published: December 2014

The fire resistance ability of load-bearing column of building structure under fire is an important aspect affecting the safety of the structure. Although a large number of research results have been achieved in this respect, the researches on the numerical analysis of the bearing capacity and deformation process at high temperature are still not sufficient. The numerical simulation of the bearing capacity and deformation process at high temperature is hard to carry out and complex to operate, and not practical as well. Therefore, simplified analysis method is adopted to analyze the deformation and internal force of the controlling section of the load-bearing column subjected to fire. Besides, taking the concrete filled circular steel tubular column as example, the basic analysis theory of the fire resistance and the deformation performance of columns subjected to constant load is presented. The numerical calculation program which is developed on the basis of this theory can well simulate the process of deformation and the fire resistance of the columns subjected to fire. The simulation results are in good agreement with the experimental results.
Dynamic Behavior of Concrete Filled Double Steel Tube under Impact with Simply Supported
Authors: Lei Gao , Wang Rui
Published: December 2014

Concrete filled double skins steel tube is a new components which is based on concrete filled steel tubular and use inner steel tube instead of core concrete. The components have many advantages such as little weight, good resistance for earthquake, good stiffness for resist bending and good performance for resist fire, and has been used in bridge pier, high-rise buildings, power transmission tower and so on. While these structures may inevitably suffer impact which comes from vehicles, ships, aircraft, etc. the structures which is impacted have taken much attention. This article will analysis dynamic behavior of concrete filled double steel tube under impact with simply supported, and propose formula of dynamic bearing capacity, laid the foundation for the analysis of impact performance of CFDST.
The Numerical Simulation for Steel Plate Reinforced Concrete Coupling Beams Based on Abaqus
Authors: Chen Dong , Fan Cheng , Song Li
Published: December 2014

Based on the concrete plasticity damage model provide by the Abaqus, the subroutine PQ-fiber provided by the TsingHua University was used to build the model and simulation for the steel plate reinforced concrete (SPRC) coupling beams. The embedded column and steel plate stress nephogram, concrete stress nephogram and hysteresis curve which was get after the simulation and which were compared with the actual test, the simulation results can fit the actual test results better, which provide some userful reference for the numerical study for the steel plate reinforced concrete coupling beams.
The Marine Environment Impacts on the Supporting Structure of the Offshore Wind Turbines and Discussions on the Protective Measures
Authors: Wu Yong Xiang , Li Hong You , Chi Hong Ming , Liu Li Yuan , Cai An Min , Ning Hong Chao
Published: December 2014

Offshore wind turbine supporting structure long term works in the harsh marine environment, suffering from a variety of negative factors such as the seawater corrosion, marine growths, water scour, collision of sea ice and ship, etc.. Through numerical analysis software SACS and ANSYS, the marine environment impacts on the supporting structure and protective measures were put forward. The study found that such adverse environmental factors might easily result in a whole or partial component damage of the foundation support structure, and eventually lead to the reduction of security and durability. Reasonable preventive measures to ensure the security of the offshore wind turbine supporting structure were proposed and theoretical guidance for the design of future offshore foundation was provided.
A Structural Damage Warning Process Based on Frequency Abnormal Development
Authors: Song Yan Sheng , Ma Chuan Zheng , Sun Zong Guang
Published: December 2014

This paper proposes a new damage warning process for structural health monitoring (SHM) system, which utilizes probability analysis on information of frequency abnormal development. This process was introduced to analyze information collected in frequency domain from a steel structure, and it achieves damage warning for the structure.
Structure Seismic Analysis on Intake Tower of Spillway Tunnel
Authors: Yan Yi Zhi , Xiong Chang Xin , Wen Xiao Cheng , Li Wei Hong
Published: December 2014

According to a intake tower of spillway tunnel established the intake tower structure—water—foundation 3-D finite element model for seismic analysis, by the response spectrum method in original design seismic parameters and new parameters of the project on horizontal and vertical dynamic response of the intake tower. The results shown that the structure of maximum dynamic stress concentration appeared near the junction of the tower with backfill concrete, where the weak parts of seismic, used the new seismic parameters calculated show greater damage on the tower, but couldn’t overturn, meet the seismic design requirements.
Study on Ground Motion Intensities and Modification for Seismic Analysis of Reinforced Concrete Frames
Authors: An Dong , Qu Tie Jun
Published: December 2014

The selection of input ground motion for seismic analysis of the structure is a complicated task, especially when nonlinear dynamic analysis is utilized. A decision has to be made regarding the intensity measure better to represent the potential damage of the ground motion. This paper presents a lot of analysis to deal with the problem. A set of nonlinear dynamic analyses were conducted on reinforced concrete buildings widely present in China. Input ground motions contain uncertainty and variability comes from both natural recordings and synthetic data. First, a set of natural recordings is considered. Second, two ground motion modification schemes are used in this study: magnitude scaling and spectrum matching. Third, a set of ground motion is synthesized. The peak value of displacement has been selected as the response parameter better able to represent the structural damage level. Nonlinear dynamic analyses of reinforced concrete buildings simulated by OpenSEES are carried out to evaluate the correlation coefficients of displacement response and the chosen ground motion parameters. Findings from the investigation indicate that the Housner intensity is the more effective intensity measure for selecting the seismic input. The synthesized ground motion fit with code spectrum shows good performance as a design input motion. Considering ground motion modification, spectrum matching is generally more stable in response prediction than scaling.
Studies on Liquefaction Failure Forms and its Damage to Engineering
Authors: Chen Xiao Ling , Wang Xiao Yan , Li Dong
Published: December 2014

The liquefaction failure forms are reviewed, including foundation strength failure, sand boil, seismic settlement, large ground displacement and flow slide. Taking pile foundations and buried pipeline as examples, there suggested some measures to reduce hazards of liquefaction.
Keys and Tactics of Existing Barracks Spatial Layout Optimization
Authors: Yan Lei , Zhou Wei Ran
Published: December 2014

Spatial layout optimization is a core of existing barracks renewal. Distinguishing from new built barracks, existing barrack spatial layout optimization needs to pay more attention to solve the contradiction between current and future. So in this chapter, we develop six primary design keys applied to existing barracks including harmony relations between barrack and its surrounding environment, emphasis on weakness construction, optimize allocation, improve security defense capabilities, enhance artistry of spatial layout and realize the whole structure optimization. Reference to ancient classical fortification thoughts and current construction conditions, we also explore 5 tactics to optimize existing barracks spatial layout , namely, function integration method, node co-ordinate method, axis control method, three-dimensional space construction method, as well as idle land reuse method. Finally, we choose one tipical case to integrated apply the above keys and tactics from theoretical and practical fields promoting the sustainable development of existing barrack .
Research on Improving Room Sound Field of Exhibition Building
Authors: Li Qian , Liu Dong Sheng
Published: December 2014

Generally, there is a high background noise and long reverberation time and poor speech intelligibility in exhibition space due to its big crowd and often commercial promotional activities so that communication is very hard, commercial activities broadcasting system is also difficult to ensure that customers can clearly hear the propaganda content. In this paper, through measured background noise of the new exhibition center in Chengdu, we found the acoustic problem in exhibition space, then we did simulation analysis in some exhibition building and took some acoustical process to get a good sound field.
Application and Feature Analysis of some Kinds of New A-Class Fire Protection Exterior Insulation and Finish Systems in Hot-Summer and Cold-Winter Area
Authors: Zhang Sheng Ju , Wang Xin Gang
Published: December 2014

According to the requirements promulgated by the state on the class of fire protection of the building insulation materials, the paper, on the basis of common external wall insulation system, introduces 3 kinds of new exterior insulation and finish systems , SJN combined self-thermal insulation wall insulation system, STP ultrathin vacuum insulation board exterior wall insulation system, composite exterior wall insulation system of polyurethane sandwich board, which are up to the national standard of A-class fire protection. The compositions, construction process, and features of above 3 kinds of new exterior insulation and finish systems are analyzed. The conclusions may provide theoretical guidance to the proper use of these 3 new external wall insulation systems in hot-summer and cold-winter area.
Effect of Mineral Powder on Performance of Unaged and Aged Asphalt Mortar
Authors: Peng Rong Sheng , Tian Hua , Liao Ling Qing
Published: December 2014

In order to analyze the effect of mineral powder on the high-temperature rut resistance and fatigue cracking resistance performance of unaged,short-term and long-term aged asphalt mortar, Dynamic Shear Rheometer (DSR) was used to study different powder/bitumen ratio of asphalt mortar. The results indicate that increasing mineral powder content can improve high-temperature rut resistance performance of asphalt mortar, but decrease its fatigue cracking resistance performance. As the experiment temperature rises, high-temperature rut resistance performance of different asphalt mortar will decrease, on the contrary, rising fatigue cracking resistance performance.
Non-Destructive Characterization of Cement Materials Using Ultrasonic Method - Application to the Study of Carbonation
Authors: Pham Son Tung
Published: December 2014

The objective of this study is to realize a non-destructive characterization of cementitious materials using ultrasonic method. The motivation of our work is to show that the ultrasound can be applied not only in medical imaging but also in the assessment of construction materials, which is not widely known in this domain. In order to solve the problem, the ultrasonic velocity measurement was performed on the samples before and after carbonation of a standardized mortar at different periods. The results offer the possibility to determine the mechanical properties such as Young modulus E, shear modulus G and Poisson's ratio. This is an advantage for in-situ structures in comparison with destructive methods that require destroying the samples. The main contributions of this study are: 1) Ultrasonic occultation of cement materials is a reliable method with a small margin of error; 2) The values ​​of mechanical properties found by ultrasonic method are consistent with theoretical values ​​found in the literature; 3) The evolution of these mechanical properties is consistent with the densification of the microstructure during carbonation due to the formation of CaCO3.
Numerical Simulation of CSG Concrete Compressive Strength(I)
Authors: Wang Yan , Yang Ling Qiang
Published: December 2014

Using numerical analysis to evaluate the mechanical properties of concrete is an important method emerged in recent years. However, some concepts and simulation methods need to be further investigated.
Experimental Study on Compressive Strength and Flexural Strength of Combined Aggregate Concrete
Authors: Zhang Yan Kun , Wang Yu Cheng , Wu Xiao Long
Published: December 2014

In this article, the flexural strength of combined aggregate concrete with four kinds of water-cement ratio (0.3,0.35.0.4, 0.45), and six ceramsite replace rate (0%, 20%, 40%, 60%, 80%, 60%) are studied with comprehensive test method. Experiment shows that the ceramsite replace rate of combined aggregate has greater influence on the flexural strength than the water-cement ratio. The flexural strength increases with the increasing of compressive strength, and the formula of the flexural strength and compressive strength of combined aggregate concrete is given.
Stability Analysis of Soil Slope Using Discontinuity Layout Optimization
Authors: Jia Cang Qin , Huang Qi Wu , Xia Bai Ru
Published: December 2014

Many efforts have been focused on stability problems of geotechnical structures with the limit analysis method. A key advance of this present method is that the problem is described only in terms of nodes and discontinuities connecting those nodes rather than element or bodies. The alternative approximation procedure might involve discretization of a given body using a suitably large number of nodes laid out on a grid, with the failure mechanism comprising the most critical subset of potential discontinuities interconnecting these nodes. The method using Mohr-Coulomb failure criterion to formulate the objective function is developed and the safety factor is determined from optimization. In order to evaluate the applicability and validity of the proposed method numerical results of some examples are presented and compared with the solutions obtained using other well-known techniques. The comparisons show that the proposed method is an effective method and can be applied to evaluate the safety factor in the analyses of slope stability problems.
Study on Optimal Mix Proportion of PVA-ECC Based on Strength-Deformation-AHP
Authors: Zheng Yu Guo , Wang Wei Nan , Cui Yuan Dong , Liu Si Min , Zhang Yong
Published: December 2014

Considering the essential influencing factors for the mechanical properties of the engineered cementitious composite (ECC), the polyvinyl alcohol (PVA) fiber was used and a batch of cube specimens and thin plate specimens of PVA-ECC were manufactured based on the variation of water cement ratio, amount of fly ash and amount of water reducer. The compressive strength test for the PVA-ECC cube specimens and the flexural strength test for the PVA-ECC thin plate specimens were conducted. A practical decision-making frame based on the Analytic Hierarchy Process (AHP) method was proposed to solve the problem of the optimal mix proportion of PVA-ECC, which can take into account the compressive strength, the flexural strength and the corresponding deformation capacity together.
Early Age Behavior of Thin Porous Concrete Pavement for Bicycle Road due to Environmental Loading
Authors: Jung Yoo Seok , Shin So Young , Lin Wu Guang , Jabonero Christopher , Cho Yoon Ho
Published: December 2014

Due to the growing the standard of living, bicycle interest has increased which concerns a negative effect in transportation. Although, bicycle road construction is increasing continuously, distress problem is occurred by empirical design which is conventionally used. To determine the optimum joint spacing, thin porous concrete pavement was constructed and measured with vibrating wire strain gauges. Joint spacing is varied in 1.5m, 3.0m, 6.0m intervals, with slab thickness 7cm. Early age behavior of thin porous concrete pavement is measured. As expected, more restraint occurred at the longer slabs.
Calculation Methods of Orienter Torque and Drag in Coiled Tubing Drilling
Authors: Hu Liang , Gao De Li
Published: December 2014

Hydraulic orienter has been widely used to alter the drilling direction downhole in coiled tubing drilling. A problem is encountered in construction field. When torque and drag of bottom hole assembly (BHA) are over the maximum output torque of orienter, This caused that it difficult to orient. Therefore, we need to calculate the maximum torque and drag in the process of orientation, it can provide a theoretical basis for designing and selecting the hydraulic orienter. Compared with the conventional force analysis, this paper additionally considered the case of zero weight on bit (WOB), the impact of the mud viscous forces and the relationship between dynamic and static friction, so that we can get more precise result of force analysis.
Simulation of a Cantilevered Thin-Elastic Plate with Large Deformation Subjected to Axial Flow
Authors: Hong Wei Bin , Guo Chang Qing , Sheng Ye Zhou
Published: December 2014

The instability and dynamics behavior of a cantilevered thin-elastic plate with large deformation subjected to axial flow is studied numerically. The structural dynamics equation is discretized by isoparametric displacement-based finite, and the motion of a continuous fluid domain is governed by two-dimensional incompressible viscous Navier-Stokes equations, which discretized by finite volume method. The two-dimensional numerical model of two-way fluid-structure coupling is established combined with moving mesh technology, realizing the interaction of thin-elastic plate and axial fluid. Firstly, under given different flow velocity, the stability of limit-cycle oscillations has been studied through Hopf bifurcation, time trace, vibration responses. Secondly, the fluid domain features are analyzed qualitatively by separately comparing with vorticity under given different flow velocity, and cloud diagram of pressure and velocity are also analyzed at U=3.6m/s.
The Numerical Simulation Research of the Dynamic Response of RC Frame Structure under the Internal Explosion
Authors: Jia Bin , Zhu Xiao Wei , Wen Zhu , Jiang Qi
Published: December 2014

The finite element model was established in this paper to study the process of dynamic response of RC frame structure under internal explosive loading. The burst point in the model was located in the center of the frame structure .The article analyzed the process of the dynamic response of the frame structure in the explosive environment and the result of the numerical simulation accorded well with the test. The result showed that the finite element model was feasible as well as providesed reference to the design and protection for the building structure.
Half-Online Identification Algorithm for Parameter Estimation of Fan Energy Consumption Model
Authors: Zhou Xiao Feng , Miao Xiao Ping , Jiang Feng , Zhang Di , Yang Jun
Published: December 2014

Concerning the salient features of components energy consumption model in air conditioning system, this paper proposes a half-online identification algorithm to estimate the parameters of the models. The algorithm monitors the error online. When the error reaches the upper limit, one-time least square estimation is used to identify the parameter and update the model by means of current data within a certain time window. Experimental studies are conducted on a fan energy consumption model, which parameters are varying in real time. The estimation results show that the algorithm can greatly reduce the computational burden and possession of resources, while ensure good estimation performance.
Singapore, Leader of Global Green Buildings
Authors: Chen Xin , Meng Cong Ling
Published: December 2014

Green buildings are vital to sustainability. In order to make Singapore’s landscape green, the BCA Green Mark is launched to recognize a building’s sustainability performance and evaluate its environmental impact. The author discusses the benefit of green buildings and how Singapore become the leader in this field.
Primary Study on Ventilate Design for Atrium as a Central Ecosystem
Authors: Luo Xue , Yan Qin , Gao Lu
Published: December 2014

Natural ventilate is important way to save energy for Public building in the area which is hot in summer and cold in winter. Atrium supports natural ventilate and it is good for ventilate. Analysis on atrium through several ways of winded pressure ventilation heated pressure ventilation and mechanical ventilation. Then uses ventilate Design and Ground Source Heat Pump to find suitable methods for design. At last, there is conclusion on different ventilate strategy for day and night, the way to come true and ventilate strategic management of technology. The purpose is finding the suitable methods for Public building energy saving and provide basis for ventilate design for energy saving building.
The Study for the Spatial Distribution Pattern of NDVI in Western Jilin
Authors: Yang Shu Jie , Li Xiao Dong , Yan Shou Gang
Published: December 2014

Using methods of spatial autocorrelation analysis and trend analysis, the paper studies the spatial distribution pattern of NDVI based on the GIMMS NDVI dataset (1998-2008), in Western Jilin. The maximum value for 15d is got through the method of MAX processing. Results show that: the NDVI in growing season shows a rising trend in western Jilin in 1998-2008. In the study area, the NDVI in Western Jilin shows positive spatial autocorrelation in the whole region, but the partial NDVI is apt to scattered distribution, which means the vegetation cover of Western Jilin is generally fragmental.
A Summary Review of Progressive Collapse of Reinforced Concrete Frame Structure under Fire
Authors: Wang Yan , Liu Yong Jun , Wang Tai Bin
Published: December 2014

In recent years, many progressive collapse accidents have occurred at home and abroad, due to the progressive collapses of a structure that often disproportion between initial damages and large collapses, these accidents caused significant casualties and serious economic losses. This paper first analyzes the research background and the definition of progressive collapse, then contrasts China with Britain, the United States, Europe and other countries for theory research status, specification research status, engineering and simulation research status, prevention measures of progressive collapse. Compared with other countries I have found that if our country introduced a comprehensive related design specifications, some progressive collapse accidents can be avoided or ease. So there will be plenty of work to be done in our country.
An Approach to the Forecasting of Debris Flow Hazard by Storms from Large Waste-Dump at Open Pit Mines
Authors: Jing Xiao Fei , Liu Ke Hui , Cai Zhi Yong , Zhou Xiao
Published: December 2014

In order to explore the impact of debris flow in large waste-dump which under the situation of rainstorm could cause disasters to the downstream region of the life and property; the research project has chosen a large waste-dump as the engineering background in Jiuzhaigou, Sichuan. According to the theory of the debris flow motion, we have made a deep analysis about the possibilities that waste-dump could cause debris flow disaster under the different frequency of rainstorm; and carried on the forecast analysis about the scope and degree of the calamity in the downstream which caused by the debris flow. The results can provide a reference for debris flow control in the lower reaches.
A Study on the System Improvement for Ensuring Evacuation Safety of People Vulnerable to Disasters in Case of a Fire in the Building
Authors: Hwang Eun Kyoung
Published: December 2014

As the disabled and the elderly are relatively lacking in the ability to cope with crisis compared to the general public, they can become major victims of casualties in the event of the outbreak of a fire in a building. The investigation of the fire trends in facilities for the old and the youth mainly used by people vulnerable to disasters revealed that the degree of casualties per fire case in such facilities was higher than the overall degree of casualties from fire. As most of the provisions in the current building evacuation regulations and crisis response systems in South Korea are devised for the health and safety of the general public, there is a lack of crisis response safety systems for people vulnerable to disasters. In this regard, this paper proposed system improvement measures to enhance the evacuation safety of the disabled and the elderly in the event of a fire in a building, through case studies of fires that occurred in disabled and elderly welfare facilities and analysis of the relevant regulations and standards.
A Survey of Learning Strategies for Engineering Students with Different Personality
Authors: Sun Yong Hong , Xiao Fei , Jiang Xiao Wei , Liu Yan
Published: December 2014

The study aims to find out similarities or differences of learning strategies used by introvert and extrovert students in the process of learning English language. The survey instrument included a questionnaire and all the participants are engineering students in Changchun University. There are altogether 32 valid questionnaires, including 15 introvert students and 17 extrovert students. The results show that both introvert students and extrovert students of engineering sometimes use the English language learning strategies at medium level. Introvert students use compensation strategies better than extrovert students. Extrovert students use memory strategies, metacognitive strategies and social strategies better than introvert students. Both introvert students and extrovert students equally employ cognitive strategies and affective strategies.
Determination of the Optimum Variant of the Material Solution of Building Constructions from the Aspect of Effectiveness of the Real Estate Development
Authors: Somorová Viera
Published: December 2014

The highest percentage proportion in the life cycle costs is represented by peripheral constructions. Determination of the optimum variant considered from the viewpoint of the economic effectiveness of real estate development is carried out by analyzing the investment and operating costs of peripheral constructions. The aim of the paper is to determine the relationship between economic efficiency criteria and determine the optimal material variant of building constructions for the specific example.
Threshold Shear Strain for Dynamic Ramberg-Osgood Model in Soils Based on Thermomechanics
Authors: Guo Xiao Xia , Sun Xiang
Published: December 2014

The threshold shear strain is a fundamental property of the soil behavior subjected to cyclic loading. Starting from the unloading and reloading hysteretic curves of dynamic Ramberg-Osgood model, construct small-strain dynamic dissipation function and explain small-strain dynamic characteristics by use of the skeleton curve back stress assumption. The plotting results of yield curves in true stress space indicate that there exist two threshold shear strains which are defined as the first threshold shear strain and the second threshold shear strain respectively which represent boundaries between fundamentally different dynamic characteristics of cyclic soil behavior. The yields of soil are controlled by the constant friction coefficient, the variable friction coefficient and dilatancy-related microstructural changes respectively. Both the first threshold shear strain and the second threshold shear strain do depend significantly on the maximum dynamic shear modulus coefficient and exponent. Comparison between the two threshold shear strain values and shear modulus reduction curves obtained on exactly the same soils confirms that the soil behavior is considerably at nonlinear at , the secant shear modulus,Gs, of the four soils studied is between 0.6 and 0.8 of its maximum value.
Model of the Information-Energy Process of Activity
Authors: Volkov Andrey , Chulkov Vitaliy O. , Chulkov Georgy O. , Grinberg Ilya
Published: December 2014

Traditional topics in systems engineering consider the importance of decomposition, requirements management, functional analysis, and testing. In this publication examination infographics model “information-energy process of activity, IEPA” which may be use of various sorts of activity.
Study on the Vernacular Dwellings’ Characteristic and Preservation in Ancient Towns of West Sichuan Plain
Authors: Wang Zhong Qing , Liao Xian , Yong Jun
Published: December 2014

On the basis of the field survey of ancient towns in West Sichuan Plain, this paper studied the traditional vernacular dwelling’ architecture characteristics, as houses pattern, structure, door and window etc. And according to the preservation status, it also suggests not only finding balance between the rebuilding and keeping the old face of the ancient buildings, but adding the culture features into the development of the ancient towns.
Research on Outdoor Advertisement Design and Setting of China’s Famous Historicl Cities - A Case Study of Yangliuqing
Authors: Zhou Mei Ting , Gong Tong Wei
Published: December 2014

Outdoor advertisement is an important part of city image. As a famous tourist town with rich cultural heritage, Yangliuqing should pay more attention to its outdoor advertisements so as to increase its appeal. Yet, relevant researches reveal that there exits many problems regarding to advertisements in Yangliuiqing. The author makes a detailed analysis of the current situation of outdoor advertisements in Yangliuqing and proposes corresponding strategies to improve the situation. Through combined efforts of all groups, the potential of outdoor advertisements in Yangliuqing will be realized in the future.