bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Study of Heat Transfer in Double Skin Facades on High-Rise Office Building in Jakarta
Authors: Daryanto Daryanto
Published: June 2012

Building envelope on high-rise office buildings have an important role of energy consumed. There are many methods and techniques that can be used to achieve this goal through energy efficiency for building envelope in the tropic area. The use of glass material becomes one of the alternatives that offer a more attractive appearance. Although the double skin facades (DSF) has been widely applied, but research on the thermal performance and behavior of the wind is still scarce for the tropics, so it is interesting to note related to energy conservation. To obtain a clear picture of the heat transfer and airflow, the research was conducted on the two office buildings with the same orientation and location but they were different on the building envelope. The study was conducted by the field measurements and simulation using CFD-ACE + software, to determine the performance of the heat transfer and behavior of airflow in the double skin facades. The results indicate that the role of wind on the design building envelope has an influence on the heat transfer and energy savings. Key words: wind, double skin facade, heat transfer, CFD, energy
Study on the Method of Rapid Making Topographic Map for Civil and Hydraulic Planning and Design
Authors: Jia Ai Chen , Ruan Ping Ping , Shi Xian Feng , Zhang Qing
Published: June 2012

Considering topographic map is a basic material of planning and design in Civil and Hydraulic engineering. A method of making contour map without compromising the precision was proposed by extracting elevation data based on Google Earth by programming and generating contours using ArcGIS. Meanwhile it indicates specific means of contours optimization and coordinate system conversion. By analyzing and comparing the topographic map accuracy with an example, the result shows the method is feasible and has reasonable application value.
Study on Design and Compilation of the Campus Electronic Map by GOOGLE EARTH and MAPGIS-Taking Shenzhen Polytechnic for Example
Authors: Yuan Yuan
Published: June 2012

This paper is designed to take pictures in the format of JPG downloaded from Google Earth as the data source, utilize MAPGIS software to design and compile the campus electronic map, and edit attributes of the campus electronic map by collecting longitude and latitude through GPS, thus achieving the image linkage.
Detection of Displacement Shifts by Control Charts in GPS Monitoring
Authors: Yi Ting Hua , Guo Qing , Li Hong Nan
Published: June 2012

The two kinds of statistical process control algorithms for detecting the small displacement shifts in the monitoring data obtained by the Global Position System (GPS) receiver are comparatively studied in this paper. The Shewhart and Cumulative Sum (CUSUM) charts are applied to the simulated and the experiment GPS coordinates, and their effectiveness in detecting the small and large persistent shifts are evaluated. The result shows that the Shewart chart is useful in detecting large shifts in GPS real-time data, but it can’t find small shifts. The CUSUM chart appears to be an ideal candidate for detecting the GPS coordinate changes in deformation monitoring since it can detect the small and persistent shifts hidden in a GPS time series data.
Automatic Generation System for Weather Thematic Map Based on Model Builder
Authors: Zhang Jing Zong
Published: June 2012

With constant expansion of GIS application，more sophisticated technology for its data processing for GIS is required. For traditional GIS platform, the users are provided with functions for geographical data processing and space operation that are bound by an order. With development of COM, ArcGIS 9 Geoprocessing allows users to build model for process neatly, and achieve the customization of functions for geographical data processing and space operation as well as combination with relevant technologies. ArcGIS 9 Geoprocessing is based on the automatic generation system for weather thematic map, which may build a model with Model Builder, connect the database, analyze and calculate the thematic maps through the running of model, so as to realize a conversion from data to graphics, and meet the need of meteorological departments for data.
Slip-Line Field Theory's Application in Soil Subgrade
Authors: Mo You , Liu Xu Chuan , Guo Zi Hong , Teng Bin , Zou Zu Yin , Zhu Zhan Yuan
Published: June 2012

Acquiring soil’s critical load is very important when designing soil foundation and soil subgrade with overloading method. Mohr-Coulomb strength theory is combined with slip-line field theory, then a theoretic method which is practicable to analyze critical load of soil come out. Analyzed theoretically and compared with others, the theoretic method is applied to describe the relationship between internal friction angel, internal cohesion, δ, lateral pressure and critical load, which express that this theoretic method is rational. Numerical analysis is adopted which make it clear that soil subgrade’s yield zone is small when it is under the critical pressure, which approve that this theory is very close to lower limit of soil’s critical load. The theoretical method can provide useful information to engineering designers and researchers.
Three-Photon Induced Optical Limiting of a Novel Multibranched Nonlinear Chromophore Containing Carbazole Moiety
Authors: Hu Zhi Yuan , Guo Fu Quan , Guo Bin , Liang Hao
Published: June 2012

A novel multibranched nonlinear chromophore containing carbazole moiety，4, 4´, 4´´-tris(9-(3,6-tert-butyl)carbazyl-trans-styryl) -1, 3, 5-triphenylbenzene (TCSTPB)，was synthesized and characterized by 1HNMR and elemental analysis. One-photon absorption in chloroform shows the optical transparent property of the chromophore in the near infrared region. The properties of optical power limiting induced by three-photon absorption (3PA) are demonstrated. Large 3PA coefficients and the corresponding 3PA molecular cross section as high as 10-74 cm6 s2 was obtained pumped by picosecond laser pulse at 1.06 μm from nonlinear transmission measurements.
An Image Matching Method Based on SIFT Feature
Authors: Shi Zhao Ming , Geng Bo Ying , Wu Zhong Hong , Dong Yin Wen
Published: June 2012

Aiming at problems about repeat matching and wrong matching appeared when traditional SIFT algorithm was used in image matching, an image matching method based on SIFT feature was put forward. Firstly, SIFT features were extracted by traditional SIFT algorithm and candidate matching point pairs were obtained by the nearest neighbor rule. Secondly, lateral matching method was used to remove repeat matched dot-pairs. Finally, Mahalanobis distance as a similarity measurement was used to remove wrong matched dot-pairs. Experiment shows this method can achieve image matching effectively with high accuracy.
Key Technological Research on the Control Survey of Qingzhou-Linshu Super Highway and the Aerial Photogrammetry of Topographic Map
Authors: Wang De Bao , Fang Xue Ling , Huang Jun , Xing Zhao Bo
Published: June 2012

Qingzhou-Linshu super highway, spanning 228.333km, is located in the center of Shandong province, which forms a south-to-north expressway channel. Undoubtedly, it’s an important part of Shandong highway network. Approximately, it runs from south to north and one projection zone is enough to satisfy relevant requests of horizontal coordinate system; From Qingzhou to Mazhan Town, Yishui County, most are hilly and mountainous terrain while from Mazhan Town, Yishui County to Linshu County, most are plain terrain, except for a few rolling terrain. As a result, fourth-order leveling control network is enough to meet the requirements of reconnaissance survey, design and constructive lofting. As the expressway and Ji-Qing south line carry out reconnaissance and design simultaneously and form an interchange at Mazhan Town, Yishui County, plus tight time and intense work, the systemic conformance of horizontal coordinate system and vertical datum are in high demand. The report analyses and discusses the adoption of horizontal and vertical network’s starting points, layout, observation, data processing and adjustment, together with eliminating the coordinate division and elevation value’s step of the same control point. In the meantime, it analyses how to make rapid aerial photogrammetry for the whole line with the scale of 1/2000, so as to improve the precision and reliability of horizontal and vertical datum as well as speed up the process of charting and utmostly satisfy the demand of highway reconnaissance and design.
New Prediction Formula of Sand Liquefied on Bachu-Jiashi Earthquake Survey
Authors: Li Zhao Yan , Cao Zhen Zhong , Li Yu Run
Published: June 2012

Through the Bachu-Jiashi Ms6.8 earthquake liquefaction investigation and test, obtain the 47 the standard penetration test date, examine the existing standard applicability based on standard penetration test of soil liquefaction identification method, and put forward the new sandy soil liquefaction evaluation formula. Analysis shows that the current assessment formula base on SPT counts of soil liquefaction are not applicable to Xinjiang region, will give the risky results. In the new survey data of soil liquefaction evaluation model established of five parameters by the earthquake intensity, the measured SPT counts, datum SPT values, groundwater level, and sand buried depth. The datum SPT values, the influencing coefficients of water and sand depths are gain by a normalized method and by an optimizing method. Establish new formula of soil liquefaction evaluation to the success judging rate is higher, the model shows that constructing reasonable and calculation formula is reliable, can be employed for regional code formulation in Xinjiang area.
Design and Performance Simulation of Two Kinds of Antipodal Vivaldi Antennas for Wide Band Radar Systems
Authors: Song Li Zhong , Hong Huan Feng , Xue Jing Hong
Published: June 2012

The Vivaldi antennas are widely used in many wide band electronic systems for its good performances. This paper designed and simulated two kinds of Vivaldi antennas for wide band passive radar applications, which are the antipodal Vivaldi antenna fed by strip line and antipodal Vivaldi antenna fed by microstrip line. The specific design parameters and the radiation performances of each kind of vivaldi antenna are provided over the operating frequency range of 3GHz to 11GHz. Furthermore a circular antenna array with six Vivaldi antenna elements fed by microstrip lines was also simulated to obtain its radiation performances over the operating frequency range of 3GHz to 8GHz. The simulation results demonstrate the designed Vivaldi antennas have acceptable performances of voltage standing wave ratio (VSWR), patterns and gains, so they can be used in practical wide band radars.
Comparison of 6 Common Noise Filter Methods for Terrestrial Laser Scanner Target
Authors: Wu Chien Ting , Chen Ming Cheng
Published: June 2012

The terrestrial laser scanner (TLS) is a line-of-sight instrument which can directly acquire dense 3D point clouds in a very short time. The registration method is used to act as a control point for a reflective target placed in overlapping areas in neighboring scanning stations. The main purpose for a reflective target is to be an obvious and precise positioning feature for laser scanning point cloud data. This study compares six common noise filtering methods which are used to eliminate measuring noise in the primitive point cloud of reflective target for better positioning accuracy, i.e. Scatter points removal method, Spikes removal method, Least squares plane method, Gaussian smoothing method, Median smoothing method, and the Average smoothing method. The test results found for 30, 60, and 90 meter distances in this study was that six noise filtering methods can actually increase the reflective target positioning accuracy, and the least squares plane method is the best one in either precision or accuracy. Beside the reflective target, the test is carried out with self-made targets for the comparison of positioning accuracy between the reflective target and self-made targets. Regarding accuracy, the reflective target is superior to the object in 30 and 60m, and self-made target is superior to the reflective target in 90m.
Semi-Automatic Area Measurement of Irregular Two Dimensional Shapes in Digital Images
Authors: Hassabo Adil I.
Published: June 2012

Measuring area of irregular shapes is essential for many applications in Geomatics engineering, Civil engineering, Agricultural sciences, and Medical sciences. In this era of digital images, a problem frequently encountered, when it is required to determine the area of irregular shapes such as irregular properties, contour lines, a parcel of land, drainage basins, lakes, ponds, wounds and tumors in human organs, swimming pools, and so on. This paper addresses this problem, and aims at developing a semi-automatic method that can be used as a software tool for area measurement of irregular shapes in digital images. The developed method is relatively straightforward and based on the raster image in which each spatial location has a pixel associated with it, and by definition each pixel will occupy a certain amount of area. The algorithm used in this method is based on spatial data in form of pixel coordinates. The algorithm is implemented in a computerized model developed in Microsoft Windows Visual C++6, and was equipped with Graphical User Interface (GUI) to friendly enable users to enter the required parameters. The experiment results using various sources of raster data, including satellite images, scanned map, medical images, and CAD drawings show that the developed software tool named (Area_IrreShape) is found to be effective, portable, easy to use, and accurate. However the cell size or the spatial resolution of the raster image is a key factor for the accuracy of measuring area by the developed software tool, and as such the accuracy increases as the size of the cell decreases. Finally, it can be concluded that the semi-automatic method developed in this paper is ideal for many applications for irregular or regular shapes, particularly where precise area measurement of large irregular two dimensional shapes in digital images is needed.
Exploring the Principle of Level Surveying
Authors: Deng Yong He
Published: June 2012

In this paper, it is proved that the principle of level surveying is uncertainty, formula of level surveying varies with selection of horizontal surface and level surface, formula of level surveying doesn’t vary with placement of level, and the principle formula of level surveying of college surveying is explained reasonably. Finally, I advise to study all results of humans level surveying based on my paper to find some new and exciting results.
On a Reverse of a Hardy-Hilbert Type Inequality
Authors: Sun Bao Ju
Published: June 2012

In this paper, a reverse of Hardy-Hilbert type inequalities with a best constant factor is given by introducing two parameters.
Large Building Overhead Installation Control Surveying
Authors: Qiu Dong Wei , Wang Yan Min , Chen Xiu Zhong
Published: June 2012

In the process of urbanization, along with a high degree of integration of the intensification of land use and urban architecture function, many large-scale large buildings have appeared which have enormous architectural space and the structure is complex. They are the city's landmarks and are the import integration of urban functions and landscape. During the construction of complex steel structure the high altitude installation need high demand to control surveying. It requires not only the surveying accuracy, precision, but also high surveying techniques on the spatial structure of three-dimensional positioning, docking, and assembly. Conventional planar and high level processing surveying mode cannot meet the construction needs. In this paper the arched surface steel roof truss high altitude installation project of China Tianjin West Railway Station is researched which has north-south length of 394 meters and east to west span 126 meters. The research aims to establish an accuracy of high three-dimensional surveying control network. This paper presents a specific implementation method of control surveying. And though data processing, accuracy evaluation and the analysis of engineering applications results, we verify the correctness of the method. This method support spatial location and geometric characteristics for arched surface of steel roof truss high attitude installation. It ensures the project successfully implemented.
Experimental Research on Inner Channel Effect of Rock Water-Gel Explosive
Authors: Xia Hong Bing , Zhang Yi Jun
Published: June 2012

An inner-pipe charging construction can be constituted by putting different materials with different internal diameter on the axis of the rock-gel explosive. Then the explosion velocity can be measured and the effect of inner-pipe to explosion velocity can be analyzed. The results show that explosion velocity of water-gel explosive changes in a mode of rising first and falling later with the increase of inner-pipe diameter and the charging ratio varies with different inner-pipe materials.
Application Study on Dynamic Compaction Technology in Mine Tailings Foundation Reinforcement
Authors: He Jiao Long , Jiang Zhong Ai
Published: June 2012

The dynamic compaction parameters and measures for tailings foundation are proposed based on actual engineering field testing result.Results of field loading test,standard penetration test and pore water pressure test show that when tailings foundation is reinforced by dynamic compaction method,the bearing capacity value is greater than 130kpa.These provide a reference to application research of dynamic compaction in the tailings foundation.
Modal Analysis of the Main Frame of Horizontal Type High-Pressure Grouting Machine Based on ANSYS
Authors: Huang Zhi Cheng , Li Ze Lun
Published: June 2012

For understanding the dynamic characteristics and improving the stability of the main frame of the horizontal type high-pressure grouting machine, the finite element analysis software ANSYS is applied to the modal analysis of the main frame based on the theory of finite element and vibration mechanics, and the first six natural frequencies and the corresponding vibration modes of the main frame are obtained. The influence of each vibration mode to the working condition of the main frame is analyzed, and provides some reference to improve and enhance the design of the main frame of horizontal type high-pressure grouting machine.
Prediction of Vibration Velocity due to Blasting Using Artificial Neural Network
Authors: Gao Fu Qiang , Hou Ai Jun
Published: June 2012

Vibration induced by blasting is one of the most hazardous events in the mining industry and may cause structural damage in country areas. Therefore, mitigating the possible hazard and predicting the vibration velocity is important. In this paper, an attempt has been made to predict the peak particle velocity using artificial neural network (ANN) by taking into consideration of maximum explosive charge used per delay and distance between blast face to monitoring point. To achieve the classic framework of this approach, the prediction results by artificial neural network were compared with measured values by coefficient of determination (CoD) and sum of squares due to error (SSE).
Field Design of Jet Grouting Parameters on Soilcrete Columns
Authors: Wang Shu Li , Mu Man Gen , Chen Dun Wu , Ren Geng
Published: June 2012

Method of jet grouting has become one of the ground improvement technologies used to address seepage concerns and to provide strength improvement of soils. The soilcrete columns can be also used to form seepage vertical cut-off walls from a series of continuous and interconnected vertical columns in deep pit. If the native soil is not completely mixed with slurry, the resulting columns will have soil inclusions which can increase the permeability of the column or fail barrier to water flow. Specifications of soilcrete columns that are achieved from the jet grouting procedures from the diameter and strength aspect depend on jet grouting parameters such as grout pressure, lifting speed, number and diameter of nozzles and c/w ratio and specifications of local soil. Different soil must use different jet grouting parameters.
Research on Monitoring Technology of Long-Span Prestressed Concrete Construction
Authors: Liu Ji Liang , Chu Ming Jin , Xu Shu Dong , Yin Ying Ying
Published: June 2012

The author performs simulation analysis on construction process of roofing prestressed concrete beam of comprehensive service center in Beijing Institute of Civil Engineering and Architecture by finite element software Midas/Gen, so as to determine the monitoring programme according to the analysis results. The monitoring results indicate that the structure is safe; the theoretical value of simulation analysis is well matched with actual monitoring value, which means that the finite element model of construction process of roofing prestressed concrete beam is correct, the simulation method is feasible and the construction process is reasonable. It has important reference value for construction and monitoring of subsequent similar projects.
The Energy Solutions for the Stability of Tower Crane
Authors: Huang Ming Xin , Xu Jian Ping , Wu Jian Guo
Published: June 2012

The energy method is used to solve the buckling load of tower crane. It can conclude the effect law on the stability of different section parameters of tower crane and thus provides some references for the design and construction of tower crane.
Current Situation and Development of Construction’s Control Method that Oversized Earth-Rock Mixtures Subgrade
Authors: Wei Lian Yu , Zhang Zhi Ming
Published: June 2012

Through large amount analysis of construction site investigation and data, we summed up several constructions control technologies and methods easier to achieve in projects for the aspect of the super-size filling embankment construction control technology.
Anti-Slipping Tests and Analysis on Steel Scaffold Couplers
Authors: Zheng Yi , Song Jian Xue
Published: June 2012

In order to provide reliable designing parameters for steel scaffold, anti-slipping tests are carried out on right angle couplers and swivel couplers, including single coupler and parallel-mounted double swivel couplers, with five grades of residual applied torque on belts of couplers. When applied torque is below 50Nm, the anti-slipping load bearing capacity ascends with torque. When the applied torque is greater that 60Nm, some couplers rapture suddenly. The working torque of couplers should be 40-50Nm. At this stage, the load bearing capacity of coupler is at its peak.
Integral Hoisting and Tension-Shaping Techniques of Ordos Cable Dome
Authors: Liu Zhan Sheng , Wang Ze Qiang , You De Qing
Published: June 2012

Based on the original construction experiences and techniques of cable dome, the method of integral assembling on the ground and synchronous hoisting of the structure of cable dome is firstly put forward. With the cable dome built in Ordos, the integral hoisting method and tension-shaping technique are put into effect. The results indicated the integral hoisting method can reduced aerial work and guaranteed constriction security.
Numerical Simulation of Shock Wave Caused by Underwater Blasting
Authors: Jiang Zhu Jin , Ling Dao Sheng , Li Nan
Published: June 2012

Underwater blasting as an important part of engineering explosion processes engineering characteristics which contains a wide applied range, high technical requirement and complicated measurement and etc. Based on a project item on underwater explosion conducted by port department in Guangzhou, This paper has studied and simulated underwater explosion on multiple models under different conditions. Further more, the relation among major variables is quantized and the influence caused by certain variables comprehensively is elaborated. The research results may offer the guidance for similar projects.
In-Plane Crushing of Square Honeycomb Cores, Part II: Energy Absorption and Cushioning Optimization
Authors: Sun De Qiang , Jiang Zu Yong , Wei Yan Bin
Published: June 2012

The finite element (FE) model designed in Part I is used to obtain the cushioning mechanical parameters of square honeycomb cores (SHCs) under in-plane dynamic loadings. A simplified energy absorption model is proposed to evaluate the energy absorption performance of SHCs, which shows that the optimal energy absorption per unit volume is related to dynamic plateau stress and dynamic densification strain that are affected by configuration parameters and impact velocity. The optimal energy absorption efficiency is the reciprocal of dynamic densification strain. The dynamic plateau stress has been discussed in Part I. For SHCs, the dynamic densification strain is independent of impact velocity and determined by configuration parameters. The empirical formulas of cushioning mechanical parameters are derived from physical analysis of FE results. Based on these empirical formulas, the practical cushioning optimization algorithm is presented.
Calculation Method on Bearing Capacity of Anchor Bolt of Transmission Line Tower Foundation Considering Influence of Horizontal Force
Authors: Cui Qiang , Lu Xian Long
Published: June 2012

Anchor bolt which is one of the most important component connecting foundation and transmission tower bears the force transmitted from superstructure. At present, in the conventional design method, uplift force is only included, however, the influence of horizontal force on bearing capacity of anchor bolt is neglected. Thus, a theoretical method on obtaining bearing capacity of anchor bolt is proposed for the first time based on the third strength theory in this paper, in which the influence of horizontal force is considered. According to the third strength theory, the calculation results of bearing capacity of anchor bolt under different force are obtained. It can be seen that the cross-section area of single anchor bolt shows linear increase with the increment of vertical uplift force, at the same time, the influence of horizontal force to bearing capacity of anchor bolt is more significant with the addition of the ratio of horizontal force to uplift force, which should be attached enough attention in engineering application. And the conclusion achieved in this work can provide valuable guidance for anchor bolt design of the transmission line project.
Research on Limited Bearing Capacity Detection Method of Large Erection Equipment Operation Site
Authors: Cheng Hong Jie , Qian Zhi Bo , Zhao Yuan , Yu Chuan Qiang
Published: June 2012

To enhance the survival capability and fast reaction capability of missile weapon system, the research on choosing launching site during the process of missile erection has been carried out. In this paper, the bearing load of launching site is analyzed in missile erecting process, and the equation of limiting bearing capacity is deduced according to K. Terzaghi suggesting equation. Combining with explicit reliability analyzing method, the sensitivity analysis of factors which influence the bearing capacity has been executed, and the detection method has been researched for partial factors which influence bearing capacity obviously. Finally, the general conceptual design of evaluating bearing capacity and choosing launching site have been provided based on blocking design thought.
Variation Analysis of Sheet Metal Assemblies with Fixture Configuration
Authors: Xing Yan Feng , Wang Yan Song , Zhao Xiao Yu
Published: June 2012

The dimensional quality of auto-body relates to the whole external appearance and wind noise, the effect of closing the door and even driving smoothness of vehicles. The deviation propagation can be analyzed through the method of influence coefficient (MIC). However, fixture deviation usually impacts on the assembly variation than part variation. A variation analysis modeling with fixture configuration is presented to improve the current variation analysis efficiency of sheet metal parts. The variation change process of part, fixture and assembly was analyzed by researching the locating and assembly process of sheet metal parts. The linear relationships among variations of parts, fixtures and assemblies are established with two locating principles of “N-2-1” and “3-2-1”. Moreover, in accordance with the different release modes of the fixture locating points after the assembly, the assembly variation modeling is established in the two modes of over-constrained release and full release. Finally, a case of sheet metal assembly is illustrated to show the effectiveness of the assembly variation analysis modeling.
Research on Contour Interpolation in Reverse Engineering
Authors: Wang Hong Liang , Ding Hai Fei , Wang Jin Qi
Published: June 2012

In reverse engineering and rapid prototyping, several intermediate contours interpolated between adjacent two-layer ICT slice are needed to meet the requirement of rapid prototyping. A method of linear interpolation based on minimum distance is adopted in this paper. On the basis of the research on interpolation problem between single contours, some researches on the interpolation problem of multiply contours was done in this paper. Satisfactory results are attained by the experiments of a vehicle engine.
Research on Total Station Data Extraction and Transmission System Based on AutoCAD
Authors: Cai Fei , Ding Ning , Cui Jian
Published: June 2012

In order to improve the efficiency of measurement, total station data extraction and transmission system based on AutoCAD is designed and implemented by the secondary development of AutoCAD software in the paper. The system is composed by communication module, data conversion module, point-plotting module. The system connects with the total station and collects automatically data to extract useful data form initial data, then automatically calculates and stores the coordinates, taking Visual Basic.NET as the development platform to realize AutoCAD-based plotting and mapping. Test results show the system realizes the integration of internal and field operation and can reduce the workload of manual editing and error rate, so as to improve the efficiency of internal operation for measurement.
Application of RNG k-ε Turbulence Model on Numerical Simulation in Vehicle External Flow Field
Authors: Wang Jing Yu , Hu Xing Jun
Published: June 2012

The two turbulence models were used to numerically simulate the external flow field around the Ahmed standard car model, and the aerodynamic drag and lift coefficients and aerodynamic characteristics around model were obtained. By comparison between the simulation results and the corresponding wind tunnel test data, the differences of two turbulence models were analyzed. The results indicated the simulation result of RNG k-εturbulence model is more precision, and it is more suitable on numerical simulation in vehicle external flow field. The conclusions provide reference for how to select turbulence model.
The Numerical Simulation of the Flow Field of Explosion in Hermitic Cavity and the Response of the Shell Structure
Authors: Yang Hu
Published: June 2012

To discuss the flow field of explosion in a hermitic cavity which is charged in center and the dynamic response of the shell structure, a FEA method is used. The overpressure-time curves of the gauges in the structure or on the wall and the deformation of the wall is shown in this paper, and some valuable conclusion is obtained.
Parameter Identification of a Class of Non-Autonomous Chaotic Systems
Authors: Yang Li Xin , He Wan Sheng , Liu Xiao Jun
Published: June 2012

we study the parameter identification of a class of non-autonomous chaotic system in this paper. Based on the stability theory, we implement accurate identification by suitable adaptive law are given to identify any uncertain parameters of a class of nonautonmous chaotic systems. Theory analysis and numerical simulations of Dufffing chaotic system is presented to verify that the adaptive control to identify the parameters are effective and feasible.
Design of Small Methane Concentration Monitoring Home Alarm Device
Authors: Ding Hui Jie , Zhang Ren Jie
Published: June 2012

The leak of coal gas and natural gas sometimes cause explosive accidents, which is great threat to people’s lives and property. In order to avoid similar disasters, we have designed a small portable alarm circuit which uses gas sensors as the main component to monitor the methane concentration. Different from former alarming devices, the design uses a SCM to sample three same sensor circuits. Once the density is exceeded, the SCM immediately drives the following alarm device to alarm, which can make up for the shortcoming of a single sensor.
Numerical Study of the Co-Firing Pulverized Coal and Biomass
Authors: Cheng Yu Ting , Jia Zhao Peng , Liu Shi
Published: June 2012

This study presented Computational Fluid Dynamic (CFD) analysis of the effect of co-firing coal blended with biomass, which is saw dust here. This complex problem which is because of its turbulent on the chemical reactions has been simulated in this paper for the purpose to decline the large amount of cost of doing experiment. The CFD analysis includes the prediction of vectors of the gas phase and DPM burnout result alike. What’s more, the reduction of CO2 by coal blended with different proportions of biomass has been presented because of low content of char in biomass. The mathematical models consist of models for turbulence flow(RNG K-EPSILON MODEL);non-premixed model with two mixture fractions/PDF model; and radiation (P-1 radiation model). The coal is from An Qin in China, and then respectively blended with 5% and 10% saw dust for co-combustion.
Experiment on Different Length/Diameter Ratio Charge Explosive Strain Wave Propagation in Rock
Authors: Yang Ren Shu , Gao Xiang Tao , Che Yu Long
Published: June 2012

In order to explore the blasting effect with charged by different length/diameter ratio in rock, adopted ultra-dynamic strain testing system to test the blasting strain wave with charged by little amount of explosives and different length/diameter in the rock models. Analyzed the radial blasting strain wave signal in the medium under the conditions of coupling charging explosive loading, got the generalities and difference of the explosive strain waveform features with charged by different length/diameter ratio, and relationship of peak strain with the relative distance. The results show that peak strain was greatly affected by the change of length/diameter ratio and charge mass in the area of close blasting source, when the relative distance is more than 45, the influence is less. Made the length/diameter ratio is 20 to be the boundary, when the length/diameter ratio is greater than 20, the peak strain attenuated slowly. The explosive energy of the big length/diameter ratio is relatively decentralized to the medium, improved the energy utilization ratio of explosives. The measured results provided a new experimental basis to further understand correctly the rock blasting mechanism.
The Concrete Fracture Performance Response to the Interface Transition Zone Parameters Based on Mesoscopic Simulation
Authors: Du Min , Jin Liu , Du Xiu Li , Zhao Yan
Published: June 2012

The interface transition zone (ITZ) has a significant impact on the concrete’s mechanical properties and fracture modes. For the influence of ITZ’s strength and elastic modulus, the extended finite element method (XFEM) is adopted to simulate the mesostructure failure process by virtue of random aggregate model under uniaxial tension. The results show that ITZ’s strength and elastic modulus have a certain effect on the mechanical properties and fracture modes. With the tensile strength of ITZ increasing, the fractured modes transit from single coalescent crack to multiple non-coalescent cracks and the fracture energy increases, the ductility of concrete is enhanced. With the elastic modulus of ITZ increasing, the concrete’s elastic modulus increases, the tensile strength and the fracture energy decrease.
Computer Simulation of Temperature Field for Be/HR-1 Stainless Steel by Diffusion Bonding
Authors: Li Hui , Zhou Shang Qi , Fang Jin Ming
Published: June 2012

In order to provide the best technic parameter for hot pressing, the diffusion bonding temperature fields of Be/HR-1 stainless steel under different cooling methods were simulated by the finite element method. The results show that high temperature parts occur in stainless steel center zone in water cooling and air cooling, and the interface cooling rates follow respectively equation of T = 0.0297 t 2 - 9.3223 t + 1017.6 and equation of T = 0.002 t 2 - 0.7702 t + 1014.8. In funace cooling, high temperature part moves to beryllium center zone and the interface cooling rate follows equation of T = -0.0192 t + 1018.8. While the heat transfer coefficient (h) is taken as 5, the temperature distribution of both sides on the interface is symmetric and temperature gradient is the lowest, so the hot stress on the interface is reduced effectively to improve the diffusion bonding strength, which results fit with the experience ones well.
A Non-Rigid Image Registration Algorithm Based on NURBS
Authors: Wang Jing Jing , Wang Hong Jun
Published: June 2012

Non-rigid image registration is an interesting and challenging research work in medical image processing, computer vision and remote sensing fields. In this paper we present a free form deformable algorithm based on NURBS because NURBS (Non-uniform Rational B Spline ) with a non-uniform grid has a higher registration precision and a higher registration speed in comparison with B spline. In our experiment we compare the NURBS based FFD method with the B spline based FFD method quantitatively. The experiment result shows that the algorithm can improve highly the registration precision.
Simulation Research of Slip Flow in Superhydrophobic Surface
Authors: Zhuang Jian , Du Meng Meng , Meng Li Min , Hou Li Jun , Ruan Jian Bo
Published: June 2012

Superhydrophobic materials can be used in building materials, such as glass, ceramics, and concrete, which keep buildings clean. Slip phenomenon plays an important role on the hydrophobic of solid surface. Based on the model of Volume of Fluid (VOF) for given inlet velocity and outlet pressure, the unilateral slip flow of three typical physical models (rectangular, triangular and round head shape physical model) in superhydrophobic microchannel are numerically simulated. Furthermore, the hydrophobic laws are analyzed in the condition of different shapes and dimensions, and the optimal dimension and shape of microstructure is obtained. Numerical simulation results show that the slip happens in the air-liquid interface of the microchannel, and when the micro rib’s height is 40μm, the slip velocity for rectangular physical model reaches to 125mm/s. When the micro rib’s height is at 50μm-100μm, the round head shape physical model has the largest slip velocity of 350mm/s. This study plays an important guiding role for the design and application of the superhydrophobic surface.
Simulation Study on Main Affect Factors to the Evacuation Corridor
Authors: Chen Yi Zhou , Cai Si Jing , Deng Yun Feng
Published: June 2012

The primary goal of emergency evacuation for pedestrians is evacuating as many people as possible to safe areas in a shortest time when the accident occurred. And the primary factor of pedestrian evacuation is egress. According to the literature, we can know that the reasonable design of the evacuation corridor and the right guidance to pedestrians are very important, and analyzed main affect factors to the evacuation corridor, which affect of the evacuation speed for corridor at different pedestrian flows intensity, the width of evacuation corridor, setting canalization to corridor and the size of space of corridor peripheral. This paper use VISSIM simulation software to study on pedestrian flows evacuation. So the formulation for pedestrian evacuation program should consider a variety of elements for the design of the evacuation egress and corridors to increase efficiency and reliability for pedestrian evacuation.
Research on Design and Simulation of Four-Bar Linkage Mechanism of Hydraulic Support Based on Virtual Prototype Technology
Authors: Zhang Yue Kan , Xiao Lin Jing
Published: June 2012

Four-bar linkage mechanism of the hydraulic support is designed by means of analytical and graphical method. A 3D kinematics model with Pro/E software is set up for the hydraulic support. The simulation analysis and interference of the hydraulic support is carried out and the motion path of the four-bar linkage mechanism under the real project condition is shown. The simulation result shows that the design of the four-bar linkage mechanism is reasonable and the designed hydraulic support meets its actual work requirements.
Numerical Simulation and Numerical Differential Computation of Bending Deformation of Ground Surface
Authors: Li Shi Bo , Li Fu Ping
Published: June 2012

The ground subsidence due to backfill mining is different from those caused by other mining methods. It’s practically important to analyze the influence of ground deformation due to backfill mining on the buildings above the ground accurately. An example of analysis of ground deformation on an iron mine in the east of Hebei was given in this paper. Then the reason why maximum subsidence angle becomes greater was analyzed by numerical simulation. The second derivative of subsidence curve was obtained by means of numerical method, and then the maximum curvature of ground deformation could be calculated. This quantitative analysis provided reference for safety assessment of buildings on the ground. The method was validated by the analysis on a real case. Comparing with other methods, this analysis method is relatively simple and more efficient.
Cloud Computing: Rebuilding EPC Management Mode
Authors: Lan Min
Published: June 2012

Relying on cloud computing concept and based on engineering theories and practical conditions to change from the traditional management concept based on engineering object division to the post-centered EPC new mode; realize real-time automatic and intelligent acquisition and processing of the project data and information, synchronic evolution of management system and works progress and full sharing of information resources in the system; establish all-service operating system through three steps, i.e. rebuilding of management structural system, intellectualization of management system and building of knowledge discovery model. The new mode can effectively improve the overall management level of the project, systemically prevent engineering risks and reduce cost of project construction and management in the long run. The development of cloud computing is of great significance to the management of construction and engineering industry in respects of intelligent completion of business functions within management system, free transition of business modules and convenient alternation of supervision hierarchies and means both inside and outside the system. Especially in field with serious project corruption, replacing the existing management mode with a new type intelligent, self-organizational and all-service EPC mode can greatly reduce the interference and impediment of human factors.
Simulation of Particulates Resuspension from Human Walking in UFAD Room
Authors: Li Can , Li Miao Shu , Ma Xiang Xue
Published: June 2012

In this study, the Lagrangian method is used simulate a process of particles resuspending from occupant walking and being carried away by exhaust in a under-floor air distribution (UFAD) room. Experiments are performed in the prototype of the model room, the results confirmed the particles concentration decay tendency. On the other hand, the numerical simulation results for time of decontaminate the particulates in indoor is agreement with the experimental results. It indicates that the Lagrangian method is suitable for calculate such a process. Based on these studies, the following conclusions can be obtained: (1) human walking cause the particles above 5μm increased rapidly by which resuspended into indoor air; (2) the particles can removaled by exhaust quickly, and it will not cause a long term effect.
Development on Serial Communication between Panasonic Electrical PLC and Computer Based on VB
Authors: Zhang Tie Yi , Zhang Yun , Zhou Xiao Rong
Published: June 2012

To meet requirements of automated warehouse stacker PLC control system monitoring software, a method of serial communication between the Panasonic Electrical FP1 type PLC and computer has been developed. The communication protocol, PLC communications settings and function process design are presented.
3D Dynamic Numerical Simulation of Water-Air Two-Phase Flow of Flaring Gate Pier and Stilling Pool
Authors: Qiu Chun , Diao Ming Jun , Xu Lan Lan
Published: June 2012

The RNG k-e model and dynamic mesh technology are applied to simulate the unsteady flow of flaring gate pier and stilling pool during the process of radial gate opening. The space-time change law of hydraulic characteristics is obtained. The negative pressure exists on weir surface while the relative opening degree (e) is less than 0.3; the maximum pressure on the slab of stilling pool increases and moves to downstream with the gate opening; the velocity near the slab is relatively larger in the foreside of stilling pool and reaches the maximum value at e=0.5. The numerical results agree well with the experimental data, which shows the method is effective and can provide reference for shape optimization of practical engineering.
Calculation of Elastic Induced Stress of Surrounding Rocks
Authors: Qian Bo
Published: June 2012

In accordance with equilibrium differential equations and compatibility conditions of deformation, the partial differential equation of induced stress is achieved for elastic surrounding rocks of tunnels and chambers of round section. By method of the superposition principle, elastic analytical solutions of induced stress of surrounding rocks is derived from the partial differential equation, which is based on stress functions and boundary conditions.
Semantic Similarity Metric and its Application in Text Classification
Authors: Zhang Pei Ying
Published: June 2012

Text classification is the task of assigning natural language textual documents to predefined categories based on their context. The main concern is this paper is to improve the accuracy of text classification system combined an improved CHI method and semantic similarity metric. Firstly, use an improved CHI method to select features from the raw features aim to reduce the dimensions of the features. Secondly, calculates the semantic distance between text feature vector and categorization feature vector so as to determine the document categorization. Finally, we carried out a series of experiments compared with other methods using the F1-measure. Experimental results show that our new method makes an important improvement in all categories.
Groundwater Seepage Rule Simulation of Horse River Based on MIDAS/GTS
Authors: Liu Bo , Gao Yong Tao , Jin Ai Bing , Deng Fu Gen , Zhang Min Zhe
Published: June 2012

In order to understand more clearly the law of groundwater seepage, recharge, excretion and dynamic change of groundwater level in the Horse River of Xishimen Iron Mine, it makes full use of MIDAS/GTS to build seepage model of settlement zone in Horse River, and by the analysis of changes of total head and the pore water pressure of the model ,we can study Horse River seepage law in the influence of mining , and track and survey the actual project. The results show that, the finite element model with the actual engineering seepage water head, pore pressure are compared, so as to provide the basis for the selection of Horse River seepage reinforcement scheme.