bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Member Buckling Influence to the Stability of Single-Layer Lattice Dome
Authors: Ma Teng Fei , Wang Jiang , Gao Ying Fu , Zhou Hui , Qu Shu Ping , Mo Zong Yun
Published: September 2014

Single-layer lattice dome as a main form of large span space structure, its stability is the key of the research.Up to now, study on the stability of the single-layer lattice dome mainly depends on the overall stability, stability of the member buckling for single-layer lattice dome as a whole research is less. In this paper, based on the K8 single-layer lattice dome as an example, considering the node flaws and member, on the basis of the single-layer lattice dome of the joint at different location of the member to be weakened, to make it before the single-layer lattice dome of the overall instability buckling, comparative analysis of different location of single member buckling of the effect on the stability of the whole single-layer lattice dome.
Bearing Capacity Reduction Factor of High Strength Bolts in the Application of Steel Grid Structures
Authors: Wang Yong , Wang Hao , Xu Jue Hui , Zhang Shu Xun , Feng Zhao Ping , Song Yan
Published: September 2014

As a important tension member, high strength bolts having crucial effect for bearing capacity of grid structure. Especially for in-service engineering, when high strength bolt tensile load doesn’t meet the standard requirements, how to determine the structure bearing capacity influence is particularly important. The article is aimed at the situation of the design review and analysis, through the bearing capacity reduction, reducing the high strength bolt bearing capacity, and the reduction of bearing capacity and the actual force are compared, to determine the safety of the structure. Through the question processing, provides a discussion for solving the similar problems.
Test on the Vibration Isolation Efficiency of Spring Vibration Isolated Turbine-Generator Foundation
Authors: Qu Tie Jun , Zan Miao Miao
Published: September 2014

For the defects of simplified calculation method of vibration isolation efficiency to the spring vibration isolation foundation. In this paper a test method of vibration isolation efficiency was proposed.Through building a 1:8 model of spring vibration isolated turbine-generator foundation, this paper study the vibration isolation efficiency by measuring the acceleration.The test results and the simplified calculation’s results were slightly different as the latter ignoring the influence of high modes.The test results show that the test method is feasible.
Failure Simulation of Single-Edge Notched Concrete Beam under Dynamic Tensile Loading
Authors: Lu Wen Yan
Published: September 2014

Crack growth of concrete beam under dynamic tensile loading is a typical discontinuous problem. It is difficult to realize the process of crack propagation using the conventional finite element method, but the extended finite element method (XFEM) is an effective method to analyze the fracture developed in recent years. This paper introduces the basic principle of XFEM and the analysis method of simulating concrete cracking and crack propagation with XFEM. At the end the crack expansion process of the concrete specimen with initial crack and dynamic load is done. The influence of crack propagation on concrete beam stresses and displacements and the crack propagation laws under dynamic tension is studied. The case shows the unique advantage of XFEM in the crack propagation analysis field.
Abnormal High Pore Pressure Prediction and Cause Analysis of Salt and Anhydrite Formation of Fauqi Oilfield in Iraq
Authors: Wang Sheng Xiang , Lin Feng , Zhang Fan , Deng Jin Gen , Yu Bao Hua , Cao Yuan
Published: September 2014

Abnormal high pressure exists in Lower Fars formation of Fauqi oil field in Iraq and lead to many complicated problems during drilling. There are salt, anhydrite and shale in Lower Fars formation through lithology analysis. Through the crossplot of sonic velocity vs. density data, it can be identified that the high pressure of Lower Fars is cause by the undercompaction of shale. Through composite analysis of different prediction methods of pore pressure, Eaton model is used to calculate the pore pressure of Lower Fars. The pore pressure begins to increase at the MB4 layer and declines to normal value at MB2 layer, and the peak is about 2.20 . The calculated results are in conformity with field situation, which can be applid to guide drilling practice in Fauqi oil field.
Analysis of One-Dimensional Consolidation of Non-Homogeneous Layer with Exponential Flow Law
Authors: Zhou Feng Xi , He Yi Ming , Xin Ying
Published: September 2014

Based on exponential flow law, the analytical solution to the one-dimension consolidation governing differential equation was deduced when the laws of permeability and compressibility coefficients with depth can be expressed as exponential function. By finite difference method, the numerical solution of excess pore water pressure and degree of consolidation was obtained, then the reliability of numerical solution is verified by comparing numerical results with analytical results, and consolidation behavior of non-homogeneous layer with exponential flow law under various parameters is analyzed. The results showed that under the condition of the two-sided drainage, the heterogeneity of foundation consolidation of index of seepage speed depends on the index of the size and the size of the non-uniform parameters. That is when the index m is bigger, increase the permeability coefficient, reduce the compression coefficient, the consolidation is faster, but the inhomogeneous parameters are still play a decisive role.
Anti-Seepage Technology for a Sluice Foundation on Soft Soil
Authors: Zhang Ting , Li Chuan , Du Xiu Zhong , Yu Yun Ji
Published: September 2014

To meet the requirements of foundation bearing capacity, end bearing piles are adopted by most of the Sluices built on soft soil foundations. However, after the completion of the sluice, there will be settlements on both sides of the backfill, which will result in base cavity, form water seepage channels, and endanger the buildings and dams. In this paper, a new steel sheet pile diaphragm wall scheme is proposed to resit seepages under this situation. Steel sheet pile diaphragm walls are disposed on the river side of the building and connected with the chamber floor to prevent wound infiltration and sliding sideways. The practical results show the effectiveness of the proposed scheme.
Application of Lime-Soil Compaction Pile Method for Loess Foundation Treatment
Authors: Huang Fei , Zhao Da Jun
Published: September 2014

Construction projects are increasingly encountered bad foundation, because of collapsible loess is widely distributed in our country, so most widely especially bad in collapsible loess foundation, this paper based on the characteristics analysis of the loess collapsibility of loess, expounded in combination with the engineering practice of collapsible loess foundation treatment methods, problems and countermeasures.
Application of Multi-Channel Transient Rayleigh Wave in Geological Exploration
Authors: Xu Meng Jiao , Wu Jian
Published: September 2014

Rayleigh wave exploration has broad application in engineering geological investigation, underground cave detection, highway nondestructive testing, etc. On the basis of introduction about the principle of transient Rayleigh wave exploration, the process of multi-channel transient Rayleigh wave exploration and data processing with an engineering example are stated. Compared to the field drilling histogram, reasonable explanation for the local deviation from the Rayleigh wave exploration result is given. Besides, the advantages and disadvantages of multi-channel transient Rayleigh wave exploration are also discussed, indicating a widely applicability of the Rayleigh wave exploration and some problems that need further research.
Experimental Research on Application of Dynamic Compaction for the Treatment of Collapsible Loess Foundation
Authors: Guo Jun Hui , Sun Hai Jian , Wang Bao Ming
Published: September 2014

The experiment on foundation improvement by dynamic compaction in Collapsible Loess foundation of the power plant was made. Before and after the experiment, kinds of in-situ and laboratory tests were performed .Through these tests, the influence of the dynamic compaction on the character of the soil, such as dry density, collapsibility, bearing capacity is analyzed. The effective depth of improvement of foundation is calculated and the conclusion of the efficiency of the foundation treatment by dynamic compaction is made. The choosing of techniques and parameter of the dynamic compaction also is elaborated in the paper, which make an example for other similar construction in the future.
FEM Analysis of the Unsteady Seepage during Excavation
Authors: Fan Ji Liang , Ren Yan Hua , Wu Yong Hong , Liu Xiu Feng , Zhou Shi Chong
Published: September 2014

The seepage is the main reason of many excavation accidents. Currently, most of the excavation designs ignore the seepage function or pay little attention on it. This paper focuses on the excavation’s stress and deformation influenced by the unsteady seepage, leading into the Van Genuchten seepage model and the Hardening-Soil constitutive model. And compare and analyze the different influences of flow field, stress field, displacement field and force caused by the steady and unsteady seepage
Finite Element Analysis of Clay Shear Band under Plane Strain Condition
Authors: Liu Ji Yuan , Zhou Tai Quan
Published: September 2014

The clay shear band analysis under plane strain condition were based on modified cam clay model in finite element software ABAQUS. Normally Consolidated Clay and lightly overconsolidated clay were analyzed in the article. Loading speed, size of soil specimen, different consolidation state (Normally Consolidated Clay and lightly overconsolidated clay) are considered. These factors have effect on the distribution of Pore water pressure, the effective stress path of nodes in shear band and out of shear band and the angle between the shear band and horizontal line. All the differentia and effects were used to analyze the production conditions and formation mechanism of shear band. The results show that size of clay specimen can influence the number of shear band. When the height-width ratio is large, the number of shear band will increase.
Numerical Simulation Analysis of Isolation Pile-Steel Shotcrete Combined Support of Deep Foundation Pit Excavation
Authors: Ma Chong , Wang Xin Gang , Hu Bin , Zhan Hong Bing
Published: September 2014

The rapid development of deep foundation pit engineering, has become an important part of the urbanization construction, which brings deep excavation support of geotechnical engineering problem research also became a major issue. This paper uses the international well-known geotechnical engineering numerical simulation software FLAC3D, through 3D finite difference numerical calculation and analysis, to better simulation calculation and analysis of deep foundation pit construction site condition, forecast after excavation of the deep foundation pit deformation displacement and dangerous position, analysis of deep foundation pit excavation process isolation pile - steel shotcrete combined support effect. Three dimensional numerical model analysis and calculation in deep foundation pit engineering design and construction scheme optimization with economy is convenient wait for a obvious advantages, can for deep foundation pit excavation of deep foundation pit support design and construction to provide effective basis.
Dynamic Response of Reticulated Domes under the Impact
Authors: Wu Chang , Wang Xiu Li , Liang Ya Xiong , Yin Zhan Zhong
Published: September 2014

As the study of the dynamic response of single-layer reticulated domes under impact, Numerical models for single-layer Kiewitt-6 reticulated domes with sub steel cube column were established by the ANSYS/ LS-DYNA program and a dynamic analysis were carried out. Four failure modes for the reticulated domes were put forward according as the dynamic response and plastic deformation. The parametric analyses on the dynamic response of single-layer reticulated domes with sub steel cube column under the impact loading are carried out, by changing the impact velocity, mass of impact object, size of impact object and impact location.The effects of these parameters on the response mode of the structures are investigated, and the distribution regularity of the response modes of the structures with different parameters is explained.
The Analysis on Rigid Core Pile Composite Foundation Dynamic
Authors: Wang Wei Yu
Published: September 2014

Through studying the field test results of rigid core pile composite foundation, Analyzing dynamic characteristics and dynamic response from peak acceleration and frequency duration, peak velocity and seismic waves. The following conclusion were got: Along with the rising of the upper load, peak acceleration of rigid core pile decrease, The frequency of Rigid core pile was between 6Hz-44Hz, Peak rate in the bottom of core pile have obvious change.
The Dynamic Finite Element Analysis for Gravitational Settling of a Sunken Ship in Soft Foundation
Authors: Xiao Zhong , Wang Yuan Zhan
Published: September 2014

The calculation for the gravitational settling and position of a sunken ship can provide important information for a reasonable salvage program. A 3D elastic-plastic dynamic finite element model was established to calculate the gravitational settling of a sunken ship in soft foundation of Tianjin port in China. The results showed that a large amplitude settlement had happened in previous seconds, and then settlement tended to be stable. The stable value was in keeping with the field observation value. Besides, a collapse pit on the top surface of soils under the hull induced by the gravity of dredge was formed while soils around the compression region were raised. Moreover, the strain value increased rapidly in previous seconds which induced a large amplitude settlement of the ship and then tended to be stable.
The Study of Deformation Law of a Super Deep Foundation Pit in the Process of Dismantling the Inner Support
Authors: Liu Bo , Liu Qing Nan , Zhao Yi Yan , Chen Bing Hui
Published: September 2014

Dismantling the inner support of deep foundation pit is a risk point.It is of great importance to guarantee the safety of foundation pit when removing the inner support, and the deformation monitoring and analysis in the process of dismantling inner support is crucial. In this paper, a super deep foundation pit engineering as the research background.Through monitoring and analyzing the law of a deep horizontal displacement of the supporting structure,ground settlement, vertical settlement and axial force of support in the process of support demolition,which can be obtained that: the settlement of surface ground around the foundation shows spatial and temporal clearly and the distribution of deep horizontal displacement of supporting structure is similar to the parabolic which the maximum point constant upward shift with supporting continuous removed.Soil pressure of supporting shared with support removing process is changing, and the earth pressures support sharing is increasing. From the monitoring results, the demolition scheme is reasonable and effective and meets the requirements of design and environment.
The Equivalence Proof of Two Methods for Foundation Excitation
Authors: Ma Yun Ying , Duan Jin , Shao Hong
Published: September 2014

In this paper, the two methods for the finite element analysis of foundation excitation would be proved mathematically equivalent. Although the two methods, i.e. the method of degree-of-freedom transformation and the Lagrange multiplier method, are absolutely different in appearance, but their mathematical essence would be proved completely identical. In other words, although the equations derived from the two methods have different degree-of-freedoms, i.e. the latter much more than the former, while in essence they could be deduced from each other and vice versa. And finally a numerical example will be presented and discussed to demonstrate the correctness of the present theory.
Pushover Analysis of Square Double-Column Piers with Considering the Pile-Soil-Structure Interaction
Authors: Zhang Shan Wen , Wang Xiu Xin , Xiong Xue Chao
Published: September 2014

In order to investigate the effects of different lateral loading patterns and boundary conditions, a square double-column piers model was chosen as an example. The statistical results of six time history analyses were taken as the benchmark for comparison research of Pushover analysis with four common lateral loading patterns. The results of numerical analyses indicate that the errors of static loading method are biggest, the constant acceleration method takes second place, and the modal method of the specified vibration mode is smallest. The errors of the M-phi curves method are larger with the increase of axial compression ratio. For square double-column piers, by comparison, the modal method can get more reasonable results.
A New Method of Dam Crack Safe-Monitoring Based on the Markov Chain
Authors: Shi Ai Xiang , Zhu Kai
Published: September 2014

How to identify and remove the noise of the dam monitoring data is an important work of dam safety-monitoring. The article makes use of a new compromise thres-holding method to de-noise the dam horizontal dam crack width. Afterwards, the article uses the Markov correction model to predict the crack width of the dam body based on the de-nosing data. In order to identify the effectiveness of the model, the article makes a comparison between the results of the above method with that of the multiple regression method. And the results show that the method of the article is of effective.
Cracking Risk Analysis of Concrete Dam at Early Age under Concrete Fast Pouring Method
Authors: Wang Hai Bo
Published: September 2014

In order to speed up the progress of the concrete dam construction, the concrete thick layers and short time intervals fast pouring method is proposed. The temperature cracking and stress safety of the dam under concrete fast pouring method is a big trouble. From the concrete cracking safety point of view, a concrete gravity dam is introduced as a case study, the influence of different thickness of layers, different time intervals and different pouring temperature on the temperature and thermal stress characteristics of the concrete dam at the early age as well as the cracking risk of the concrete are deeply studied. According to the analysis, the corresponding cracking prevention technology is put forward. The research provides a technical support for establishing the concrete temperature control criteria and the relevant temperature control measures for the concrete fast pouring method.
The Effect of Curtain Boundary on the Dam Foundation Seepage Control
Authors: Huo Shao Jun , Tong Fu Guo , Liu Gang
Published: September 2014

The dam foundation seepage control is usually a main work of dam design. This paper presented the effects of different concrete curtain boundary conditions on the dam foundation seepage control through numerical calculation with the finite element method. The results show that the depth of concrete curtain strongly depends on the permeability of dam foundation. The middle of curtain should be deeper than its sides if the permeability of central riverbed is higher. Therefore the design of curtain should be based on the numerical analysis of the dam foundation seepage with different curtain boundary conditions in order to make sure the safety and economy.
The Indicator Variable Principal Component Neural Network Model for the Prediction of the Opening of Dam Crack
Authors: Ji Jing
Published: September 2014

In order to effectively predict the opening of crack, the variation law of the crack is studied, and the indicator variable principal component neural network model is established by combining indicator variable model and principal component analysis with neural network theory. This new model can solve the problems of nonlinearity between the effect variable and the affecting factors and the colinearity between the affecting factors effectively and improved the prediction accuracy. By a case study, it showed that the prediction results are close to the actual values.
Analysis of Deformation and Failure Characteristics of Stratified Rock Mass around Underground Opening Based on a Microstructure Tensor Approach
Authors: Yang Yun Hao , Wang Ren Kun
Published: September 2014

In order to have a good understanding of the geotechnical behavior around underground opening excavated in stratified rock mass, numerical simulation of a gate-shaped cavern excavation was conducted by applying a transversely isotropic model base on microstructure tensor method. The simulations were performed under the assumption that both the beddings and the in-situ middle stress vector run parallel with the cavern. Effect of the dip angle of beddings and that of in-situ major stress vector on deformation and failure of rock mass around the cavern was investigated. The mechanism underneath the image of deformation and failure was also discussed. It is found that the dip angle of beddings has less influence than the in-situ stress on deformation while the dip angle of bedding and the direction of in-situ major stress vector are equally important to the failure of surrounding rock mass.
Simulation Research for the Excavation Stability of III Brittle Rock Based on Vault Settlement Effect
Authors: Guo Long , Liu Ke Ling
Published: September 2014

Due to the brittle rock deformation is not obvious, and the destruction process has the features of sudden and concealment, it is often neglected in the field during construction. In this paper, Brittle rock was selected as the research object. Using the vault subsidence as monitoring parameters, the excavation process was simulated in single line tunnel by the finite element analysis tool of ANSYS, we obtain the maximum displacement of brittle rock and stress variation with time. Then the subsidence effect of different buried were analyzed, to determine the stability period of III Brittle surrounding rock. The research results can be used to guide the development of the monitoring standard, in underground engineering construction of the brittle rock.
Numerical Simulation Study of Crack Development Induced by Transient Release of Excavation Load during Deep Underground Cavern
Authors: Luo Yi , Li Xin Ping
Published: September 2014

The cracking and developing of structural surfaces is one of the main causes for surrounding rock mass large deformation and failure in deep underground cavern excavation. A numerical simulation method for discontinuous structural surface development is proposed based on the transient unloading of excavation load during underground cavern excavation. The program will automatically evaluate every substep in the dynamic calculation, and determine if the development stops and the cracking direction based on dynamic fracture mechanics. The penalty function is adopted to simulate the opening and sliding characteristic of structural surfaces. And the cracking path would be shown by iterative calculation. Results show that, the lateral pressure coefficient (LPC) is the main factor of cracking direction. When structural surface is shallow to the side wall, the crack would develop to the surface of the side wall. When it is deep enough into the side wall, the cracking might stop before it goes to the surface of the side wall. The accuracy of this simulation is verified by the comparison to relative laboratory tests.
Calculation Methods for Water Inflow from Typical Sections in a Long Deep Buried Tunnel
Authors: Deng Ying Er , Peng Xin , Yan Long Chao
Published: September 2014

This paper focused on five kinds of methods for water inflow of typical sections in a long deep buried tunnel under conditions of high ground stress and high water pressure (referred to as “two high conditions”). The methods are based on groundwater dynamics formulae and practical experience. Results show that calculation data by the method 5 is the maximum. There is little difference of calculation results between the formulae 1 and 2 or between the formulae 3 and 5. The calculation methods and results of the water inflow can provide prevention of gushing water of a long deep buried tunnel under the two high conditions with scientific basis.
Comparative Analysis of the Influence of Different Construction Technology for Excavation on Adjacent Tunnels
Authors: Du Yong Gang , Cao Jing , Ding Zu De
Published: September 2014

Based on the project of a foundation pit engineering adjacent to existing tunnel of Kunming metro line 1, a 3D calculation model is established in consideration the interaction of foundation pit support structures, tunnel structure and soil. In this paper, the authors have simulated the foundation pit excavation process in three conditions, and analyzed the changing laws of the lateral displacement and internal force of the tunnel induced by adjacent excavation under different conditions. Calculation results show that the distributions and the values of the displacement and internal force of the tunnel are obviously different under three different construction technologies, and the “jump dig” is the optimum excavation scheme due to the restriction in the excavation of foundation pit, and the lateral deformation of tunnel structure is smallest in this condition. The conclusion can provide a theoretical basis for similar excavation engineering construction.
Numerical Simulation Study on Combined Supporting Scheme of Bolts and Anchor Cable
Authors: Wang Wen Cai , Wei Wen Bin , Wang Ling
Published: September 2014

Aiming at the face roadway 22109 of Cuncaota coal mine, using FLAC3Dnumerical simulation software, 19 of 5 groups about bolt and anchor combined support schemes were analysed and compared, and the reasonable scheme of φ18×2000mm thread steel bolt and φ17.8×6500mm anchor cable combined support was obtained. Support result of this scheme was analysed with FLAC3Dsoftware, the result show that this scheme can support the roadway effectively. Practical application show that this scheme can achieve the security, economical and effective support result, and can be used in this type of roadway.
A Quadrilateral Meshing Method for Shear-Wall Structures
Authors: Duan Jin , Chen Xiao Ming , Li Yun Gui
Published: September 2014

In this paper, a meshing scheme for shear-wall structures is developed based on the paving method and associated with the mapping and geometry decomposition method. The present method would combine the advantages of free mesh, such as strong generality for complicated structures, and mapping mesh, such as outstanding efficiency for some specific geometries, and result in the following four merits: (1) theoretically suitable for arbitrary shear wall and slab; (2) the mesh is compatible, i.e., the adjacent boundary of the shear-wall and slab has identical nodes; (3) all or most of the elements are quadrilateral which is important for finite element analysis; (4) the mesh is uniform and homogeneous, and the transition between different mesh size would be automatically smoothed. Finally, some meshing examples for complicated building structures are presented to illustrate the validity of this meshing scheme.
Research on Loose Circle Test of Deep Broken Roadway
Authors: Cui Feng Zhan , Xue Hua Jun , He Tian Yu , Li Tao Tao , Zuo Jin Jing , Guan Xi
Published: September 2014

To control the stability of deep well broken surrounding rock, single-hole sonic method is used to test the loose circle of-1180 east-rock main roadway and its damage range. The study indicates the loose circle is about 1.8 ~ 2.2 m, which is typical large loose circle. And its button is slightly larger than two sides’, right side slightly larger than left. The roadway rock has some engineering features of soft rock. The broken and expand deformation of loose circle does large, difficult to support. Combined support is usually used in this rock condition.
Bridge Time-Variant Reliability Assessment Considering Resistance Deterioration and Load Change
Authors: Wu Xun , Zhang Zhi Chao , Li Jie , Yi Xian Shui
Published: September 2014

With the bridge member resistance deterioration and traffic volume increasing on the bridge, bridge reliability considering time-variant factors has become an important problem. This paper presents a method to estimate the bridge safety performance based on time-dependent model of resistance decreasing and load change. Power form functions are used to fit the resistance degradation models in three environmental conditions, and time-dependent model of load increasing is built in accordance with traffic observation results somewhere. The results show that normal distribution probability model can be used to fit dead load time-varying model. In analysis, the most disadvantageous load combination effect is mainly considered, live load time-varying function approximately follows extreme type I distribution model. Finally the proposed approach combined with Monte Carlo method is used to assess the time-varying reliability index and the safe serving time of one prestressed concrete bridge in use.
Geometric Nonlinear Effect on Large Span Cable-Stayed Bridge
Authors: Chen Shuang Rui , Yan Quan Sheng
Published: September 2014

It is introduced that three main factors cause geometric nonlinear effects of long span cable-stayed bridge: large displacement effect, cable sag effect, and the combination of bending moment and axial force effect. The iteration method of geometrical nonlinear problem is also introduced. The bridge deformation was calculated by establishing a plane truss finite element model of a long-span single tower cable-stayed bridge under consideration of nonlinearity and compared with that done with linear method. It is concluded that nonlinearity influenced differently to the bending moment of main girder, the displacement of tower root and the vertical displacement of girder.
Effect of Wall Insulation with Different Orientation on Energy Consumption in Different Climate Areas
Authors: Huang Di Kai , Yu Hai Ying
Published: September 2014

The aim of the present work is to evaluate the effect of wall insulation with different orientation. The author build an office building model using eQuest, analyze the cooling/heating energy consumption and utility bills with different exterior wall configurations for each orientation. The simulation used 5 different climate areas around United State as building locations. The results indicate that wall orientation does have influence on energy consumption for buildings and thus influence the utility bills ;The influence also vary with climate conditions.
Studying the Effects on the Absorption Rate of Absorber Plate Having Different Surface Shapes
Authors: Li Shui Lian , Wang Hong Xia
Published: September 2014

The aim of this study is to provide a remedy for the low absorption rate of absorber plate. This paper presents an experimental investigation and simulation of the optical path on the absorber plate with having different surface shapes. In the study an analysis of three types of absorber plate: a base flat-plate, V shape plate and the sinusoidal-corrugated absorber plate are presented. The results of the experiments were evaluated at the same time of the days. The comparisons of absorption rate of absorber plat were made among them. The present data showed that the absorption rate of the sinusoidal-corrugated absorber plate is the highest.
Research on College Teaching Building Energy Saving Design
Authors: Xue Ju , Wang Shu Pei , Huang Jia
Published: September 2014

In recent years, with the increasing of energy consumption in our country, about the energy consumption problem of teaching buildings in university becomes more and more important. In this article, through analyzing the characteristics and energy consumption situation of the teaching building in Three Gorges University, and put forward some problems existing in university teaching building energy saving and the corresponding improvement suggestions, so as to promote the construction of the economical universities.
Discussion on Development Trend in the Construction Industry - Green Low Carbon Buildings
Authors: Liu Su Fang , Ren Hai Yang , Niu Ye
Published: September 2014

With the development of society, the concept of building energy conservation and reuse become more and more popular. As the result, it is important to develop energy-saving buildings and advocate low carbon life, so that it will push ahead the efficient use of building energy, and moreover, the energy saving in the daily life of the society. Nowadays, the public society has pay close attention to the green low carbon buildings as it is consistent with this trend. Starting from the concept and features of green low carbon building, this article discussed the approach of achieving the low carbon buildings according to the engineering design. In the end, this article also addressed the significance of implementing green low carbon buildings.
The Analysis and Application of Building Water Supply and Drainage Energy Saving Technology
Authors: Wu Rong Liang
Published: September 2014

In the current, our country's urbanization process becomes faster and faster, The construction industry developing rapidly nowadays, The water-saving and energy-saving design is particularly important to architectural design. Although the building water supply and drainage industry has made significant progress, still there are many problems in the concrete implementation process. Therefore, in the process of water supply and drainage design, we should take corresponding solutions and countermeasures, in order to realize saving water and reducing waste.
Study on Technical and Economic Evaluation Method of the LID Mode
Authors: Ma Heng Sheng , Yang Ying
Published: September 2014

Technical and economic evaluation plays a important role in LID mode application. This article is based on evaluation process of construction project, including fully consideration about all kinds of costs and benefits which the LID mode has. According to comparing the differences between traditional rainwater drainage pattern and LID mode, finally the incremental internal rate of return (ΔIRR) is as the main evaluation index, with the consideration about environmental and social benefits.
Coupling Effect Research on Artificial Forest Carbon Sequestration Capacity and Ecological Environment
Authors: Wang Zhi Guo
Published: September 2014

To greatly develop carbon sequestration forestry, conduct carbon sequestration forestation, increase forest carbon sequestration, ensure reduction of forest carbon emission, is an important measure and a completely new work to actively deal with climate change. This paper introduces the development process and research trend of coupling effect of artificial carbon sequestration capacity and ecological environment, explores the coupling development modes, and the relations between function coupling and composition element coupling with the objective of further improving the construction of ecological civilization and ecological environment.
Investigation on Municipal Solid Waste Separation and Integrated Utilization Technology
Authors: Chen Lin , Wang Shu Zhong , Wu Zhi Qiang , Meng Hai Yu , Zhao Jun , Lin Zong Hu
Published: September 2014

According to the “harmless, reduction and recycling” processing principle, landfill method, incineration and compost method were studied that secondary pollution and resource waste problems were unavoidable. From the perspective of circular economy, Municipal Solid Waste (MSW) separation and integrated utilization technology was proposed. The composition of MSW was investigated. The influence to sorting equipment by the garbage component properties was analyzed. On the basis of the full analysis of relating technology drawbacks, the sorting equipment, such as crush equipment and air classification equipment, were designed. Organic bacterial manure is produced by organic material, which was sorting from MSW. Plastic-wood is produced by mixing plastic and wood powder. Refuse Derived Fuel (RDF) is produced by papers and textile.
Research Review on the Ecological Function of Biogenic Volatile Organic Compounds
Authors: Lv Ling Yue , Li Hong Yuan , Yang Jia Nan
Published: September 2014

Biogenic volatile organic compounds are a class of small molecule compounds produced by the plant secondary metabolites. Although the contents are relatively low, but have strong ecological effects. In plant communities, the plant can hinder the growth of competing plants around by releasing BVOCs, and it could also enhance the ability to resist predators. At the same time, it can inhibit the pathogenic microorganisms and enhance the disease resistance. In addition, BVOCs can regulate the body's mental and physical state to exert the health effects. Therefore, the study of the BVOCs’ ecological functions is of great significance.
Study on Heavy Metal Accumulation of Plantsin Gejiu Tin Mining Area
Authors: Li Gui Xiang , Shao Jin Ping , Fang Xiang Jing , Ma Jing Jing , He Li Ping , Chai Yong , Bi Bo
Published: September 2014

Based on determination of heavy metal contents in soils and plants, understanding pollution of heavy metal in soils and plants, as well as the heavy metal accumulation in plants, in order to provide scientific basis for phytoremediation of heavy metals in mining areas. The determination and analysis on the concent of Zn, Cu, Pb, Cd, Mn was made in Niuba and southern mining area in Gejiu City. The result showed that the soil pollution from Cd is the most serious while the pollution from Zn was relative to minimum in Niuba abandoned mining area. In southern mining area, Pb in soil pollution was the most serious while Cu was relative to minimum Analysis on correlation between the heavy metal content in plants and soils was made based on the 5 plant samples (Pyracantha fortuneana, Zea mays, Acroptilon repens, Equisetum ramosissimum and Cucurbita moschata) collected from Niuba reclamation area and 5 plant samples (Corylus yunnanensis, Alnus nepalensis, Pyracantha fortuneana,Cupressus torulosa,Acacia dealbata) from recovery area of southern mining area. The results show that Pyracantha fortuneana has a better correlation with soil than other plants, Cucurbita moschata and soil have poor correlation, Corylus yunnanensis has better correlation with soil compared to other plants, Acacia dealbata has poor correlation with soil.
Observation and Study of Summer Aerosol by APL Lidar at Beijing
Authors: Yang Hui , Zhao Xue Song , Zong Jun Jun , Lv Cao Fang
Published: September 2014

The vertical distribution of aerosol extinction coefficients, and relativity between aerosol and BC the within summer planetary boundary layer (PBL) over the observation site are shown in this paper. The data indicates that the aerosol is almost trapped within PBL and troposphere layer is rather stable and the main composition of aerosol in Beijing is BC. The multi-layer structure of the aerosol distribution is obvious.
RCM Analysis for Insulating Switch in Substation
Authors: Li Zhi Min , Shi Feng , Cheng An Sheng , Du Peng
Published: September 2014

Reliability centered maintenance (RCM) is well known for its widely application in various manufacturing industries, but the study on insulating switches of substation is still blank. In this paper, based on RCM evaluation, fault tree is built according to substation fault data, so as to establish fault assessment model of insulating switches. Corresponding fault and maintenance, RCM evaluation model is set up to assess substation maintenance scheme. After combining with actual data from all substations, a series of calculation is implemented, which lead to improving suggestions. Eventually, optimal reliability and economical efficiency is achieved.
The Electric Potential Distribution of Linear Charge and the Infinite Long Dielectric Cylinder Shell System
Authors: Shen Wen Mei , Wang Shu Ping , Ma Li Hong
Published: September 2014

This article calculate the potential distribution of the line charge and infinite medium cylindrical shell, it is discussed that the electric potential of linear charge and dielectric medium cylinder shell system or the electric potential of linear charge and medium cylinder system and can be given by the line charge and medium cylindrical shell system potential.
Research on Multiple Autonomous Underwater Vehicles Formation Control
Authors: Lin Zi Qi , Pang Yong Jie , Jiang Da Peng
Published: September 2014

While the single AUV is sometimes unable to meet the complex and difficult tasks demand, the advantages of the multiple autonomous underwater vehicles (MAUV) system was proposed. Several MAUV formation methods were studied and master-slave collaborative formation method was focused. The law and algorithm of master-slave formation control was designed and analyzed. Representative formations for different tasks were proposed and the advantages and disadvantages were discussed.
Research on Cloud Service Leasing Method Based on Maximum Benefit
Authors: Xie Yong , Zhang Yi Lai
Published: September 2014

In order to promote mutual benefit of service provider and requestor under the cloud computing environment, a new method to obtain maximum utility during cloud service leasing progress was proposed. Cloud service providers decide to tender or not according to their actual conditions and tender bid, and at the same time, it’s evaluation and other service providers’ recommends are considered during the bid evaluation by the service management center, the maximum utility will be computed among the servers provider and server requestor to determine which services bid. It showed great effectiveness of this method through a large number of simulation experiments.
Analytical Modeling and its Validation for Data Acquisition of ADS-B System
Authors: Wang Jian Hui
Published: September 2014

Based on the accuracy and integrity quality evaluation indexes of ADS-B navigation data, this paper foucses on the analytical modeling of ADS-B navigation data source under the global positioning system (GPS) and Compass system. The factors related to accuracy and integrity of ADS-B are derived and simulated, which include the position estimated uncertainty (EPU) and horizontal position integrity containing radius (RC). It is the first to give the quality index levels of the ADS-B horizontal data source in Tianjin under GPS and Compass. The simulation results show that ADS-B navigation data availability under Compass not only meet the lowest requirements recommended by the civil aviation administration of China (CAAC), but also is better than under Compass. The results derived from this paper provide the theoretic support for the implementation of ADS-B in Tianjin Binhai international airport and other areas of China. At the same time, Compass being navigation source increases reliability and security for ADS-B implementation of our country.
Application of Anti-Outlier UKF Algorithm in Integrated Navigation
Authors: Liu Wen Chao , Bian Hong Wei , Wang Rong Ying
Published: September 2014

In view of the problems on nonlinearity of system model and robustness of filtering algorithm in Integrated Navigation, the algorithm of Unscented Kalman Filter (UKF) for outlier rejection is studied. The algorithm identifies outliers firstly by using the new observation rate, and then rectifies the observation outliers by using of Newton interpolation and finally gets the relatively more accurate estimated value. The combination of Newton interpolation and UKF resolves the nonlinear problem of the system model as well as effectively suppresses the impact of outliers to filtering algorithm. And effectiveness of the methodology has been proved by simulation.
Trend Analysis on the Flow Alteration in the Nature Reserve, Upstream of Yangtze River
Authors: Shen Chen , Dong Lei Hua , Wang Yi Cheng , Feng Shun Xin , Wang Ying
Published: September 2014

National Nature Reserve for the Rare and Endemic Fishes in the Upper Reaches of the Yangtze River (RURYR) in China has been established to protect the extraordinarily perfect aquatic ecosystem since 2005. However, four cascade hydropower stations located in the upstream of RURYR will impound and generate electricity gradually, which may change the natural flow regime there. Since flow regime is of great importance to maintaining the healthy and integrity of aquatic ecosystems, it is essential to study the rules of its variation. The flow alteration in RURYR was characterized by Indicators of Hydrologic Alteration (IHA) during 1960-2010, and its trends and the change rules were analyzed for further study on environmental flow and multi-objective optimal operation. The results indicate that in terms of almost no change in total annual runoff, the flow shows a decreasing trend in the flood season, especially in August and October, but an increasing trend in the dry season (from January to June). The variation trend seems reduce the flood risk as a good purpose, however, along with the multi-operation of the cascade reservoirs, the loss of flood peak will increase more significantly, which is harmful to the aquatic ecosystems.
Characteristics of Temporal and Spatial Distribution of Water Quality in the Ponds of Lv-Tang-River National Urban Wetland Park, China
Authors: Liu Ya Yun , Liu Ying Yi , Mo Li Bing , Zeng Chu Shan , Yang Ming Long , Li Yuan Hao , Zhong Chun Mei
Published: September 2014

Based on the data collected in January, March,July and October in 2013, the characteristics of water quality in temporally and spatially in the ponds of Lv-Tang-River national urban wetland park were investigated. The results show that the main pollutants of Lv-Tang-River wetland are chemical oxygen demand, total nitrogen and ammonia nitrogen. Their average concentrations are worse than the national quality standards for Class V. The characteristics of water quality in spatially are significantly correlated with the plant configuration in the wetland. The water quality in reed pond is the best. Secondly is in natural pond. The worst is in lotus pond. The average of single parameter pollution index (Sj) of reed pond, natural pond and lotus pond is 1.72, 1.82 and 1.96. The water quality in the three ponds belongs to light pollution area. The water quality in July and October is better than that in January and March. In July and October, the water quality belongs to light pollution area and Sj is 1.12 and 1.35 respectively. In January and March, the water quality belongs to moderate pollution area and Sj is 2.17 and 2.71, respectively. In order to improve the water quality in Lv-Tang-River national urban wetland park and protect the ecological environment of Zhanjiang city, the valid measure is to strengthen the management of artificial ponds in winter and spring.
Deposition Morphology of Tributary Zhenshui in Xiaolangdi Reservoir
Authors: Wang Ting , Ma Ying Ping , Zhang Jun Hua , Ma Huai Bao , Fan Li Wen Ling
Published: September 2014

Zhenshui is the biggest tributary of Xiaolangdi Reservoir, and its original storage capacity is 1.767 billion m3 and accounts for 33.5% of the tributary. By October 2013, the amount of sediment in Zhenshui reached 0.2365 billion m3, and the sand bar was 5.78m in height. Influenced by operational mode of reservoir and terrain, the formation of sand bar at Zhenshui estuary has certain inevitabilities. The sand bar can prevent water and sediment exchange between mainstream and tributary, and the internal storage capacity of tributary is not effectively used. Analyzing sand bar and its cause can supply some technical supports for prevention.