bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Test of Reducing Deformation of Soft Rock Tunnel with High Stress Level by Pilot Heading
Authors: Yan Xin , Ye Yang Sheng
Published: June 2012

Generally speaking, the pilot heading is aways used for geological exploration，speeding up the construction，improving the draining and Ventilation condition, promoting efficiency of residue transporting. When tunneling on high ground stress soft rock region，the pilot heading will play a more important role. Lan yu line Mu Zhai ling tunnel main passes through the region of carbonaceous slate. Due to the high ground stresses, the primary reinforcement system underwent large deformation, evenmore the lining is cracked. Through excaving the pilot heading, can relief the stress. Then enlarg the pilot heading to main tunnel, the deformation of primary support will be reduced, and the tunnel will be stable. Compare the "pilot and enlarging" excavation method with bench excavation method on surrounding rock deformation. As the result, the "pilot and enlarging" excavation method is effective for control of the deformation of the tunnel.
A Study on the Non-Saturated Concrete of Subsea Tunnel
Authors: Wei Xin Jiang , Zhang Yuan Zhu , Li Xiao Zhen
Published: June 2012

The objective of this study is to investigate the water seepage in unsaturated concrete under pressure through theoretical derivation. To establish the theoretical mode of water pressure and seepage velocity various with location and time. Finally, a formula about penetration depth is derived. And it is more practical. Meanwhile, analysis is made about the effect of the water pressure, the strength grade, permeability and relative permeability and other factors on the flow velocity and penetration depth.
Back-Analysis on Initial Ground Stress of Underground Workshop Region of Shenzhen Pumped Storage Power Station
Authors: Zhang An Jing , Gao Zheng Xia
Published: June 2012

Abstract. This article based on the underground workshop region of the Shenzhen pumped storage power station, carrying on back-analysis for the initial geostress field of the region of station with method of this article, and then we can obtained the actual initial ground stress.This article based on the measured ground stress data, a 3D non-linear finite element back analysis numerical model for ground stress is set up and the landforms is simulated. This thesis has used ANSYS to do finite element calculation for rocks and soils, the corresponding sample of neural network have been gained. By setting the parameters, the neural network is optimized, then the network is trained with the optimized result. Finally, the initial ground stress field is back-analyzed with in-situ measured stress values. The result is compared with measured value, which meets the requirement for accuracy, showing the reasonabilily of the rock ground stress field obtained.
Stress Predicting on the Surrounding Rocks of Tunnel Based on BP Neural Network
Authors: Sun Zhi Jie
Published: June 2012

Surrounding rock stress is a one of significant feedback information after tunnel excavation. It is also an important factor influencing the stability of the tunnel, and the premise to determine accurately the tunnel stability. For tunnel surrounding rocks stress determined by many uncertain factors, it is difficult to accurately predict. The BP neural network model for predicting on the stress of the tunnel surrounding rock stress is created. Comparative analyze the results of the surrounding rocks stress prediction on expressway tunnel by momentum gradient algorithm, L-M algorithm and bayesian regularization algorithm. Results show that the use of bayesian regularization algorithm for neural network model has higher forecast accuracy. It can be applied in engineering practice.
The Influence of the Clay's Geotechnical Behaviors with the Fly Ash
Authors: Zhao Xiao Min , Cao Li Wen
Published: June 2012

In this paper, the different proportion and different time of fly ash soil mixed soil properties， mainly the plastic liquid limit and compressive strength were analyzed. The results showed that soil plasticity index was decreased with the increase of the content of fly ash and the plastic liquid limit decrease with the extension of time. The compressive strength of the three kinds mixing with the different water content was increase following the water content decrease. Moisture content is less than the best water content, compressive strength changes with the water content, water content is greater than the compressive strength of the best when water content with moisture content changes gently. This paper analyses the influence mechanism of the characteristics of the fly ash on soil.
The Study on Soil Pressure on Embankment Culvert under High-Fill
Authors: Weng Xiao Lin , Wang Wei , Zhang Liu Jun
Published: June 2012

Based on the centrifuge model test this study established a mathematical model in which the interaction of culvert, soil, and culvert base and foundation were incorporated and developed a new method for calculating the soil pressure on embankment culvert. Centrifuge model test was performed in varying conditions to determine the relation between vertical soil pressure and filling height and to find out the variation of displacement field nearby the culvert. The results indicate that the vertical soil pressure on trench culvert is not always lower than the theoretical calculation value instead, it is related to and varies in nonlinear manner with a number of elements including filling height, width and slope of trench, dimensions of culvert, physical properties of backfill material, and stiffness of foundation, etc. When fills go up to a certain height, soil arch effect may develop on top of the culvert, with limited stability, which can relieve the stress concentration in this area.
Study on Stabilization of Tunnel Foundations Built on Collapsible Loess
Authors: Niu Hong Tao
Published: June 2012

Loess soils always have lower dry densities, open structures and joint fissures, and could exhibit a significant decrease in volume due to their collapse when wetted. These soils pose potential threat on structures built on them. When a tunnel built on such soils, the bearing capacity of tunnel foundation could not always meet requirements of structural stability, and therefore need some improvements. The improvements of collapsible loess foundation include cement compaction piles and root piles.
Correlation between Underground Space Intensity and Land-Use Transport Interaction
Authors: Zhu Wen Jun , Liu Jun
Published: June 2012

Urban planning for vertical space use must consider underground space form and intensity. But little researches and investigations about it have been done. Planners have little knowledge about quantitative mechanism of underground space developing and evolution. Advanced countries developed experienced data of underground space distribution. Modern statistical analysis method provides an efficient tool for this kind of quantitative and empirical research of spatial correlation. This paper selected some of the major characteristic indexes of land-use transport interaction and induces spatial statistical model to analyze the correlation between intensity of underground space use and the indexes of land-use transport interaction in central four districts of Tokyo City. Results show that the intensity of underground space use has positive and stable quantitative correlations with land use function (LT), land price (LP) and floor area ratio (FAR), especially significant in commercial and mixed land-use areas. The influencing factors of land-use transport interaction could be used as external indexes for forecasting the intensity and spatial distribution of underground space in urban central areas.
Stability Analysis of Approaching Construction in City Tunnel Based on Numerical Simulation
Authors: Dai Chun Quan , Wang Lei
Published: June 2012

The safety control of tunnel construction of urban shallow buried adjacent existing buildings is the new problems we have met this year in tunnel construction design. The text takes the link construction of Jiaozhou Bay subsea tunnel of Qingdao into combination, established three dimensional finite element model, analysis the interaction of tunnel-stratum-existing building which is caused by the tunnel construction. Study the surface subsidence pattern, the influence length of lengthwise the tunnel excavation and the change of uneven settlement of the upper buildings. According to the situation of construction, design five construction plans to optimization the design.
FEM Analysis for Seismic Performance of Large Aqueduct Structure with Different Bent-Height
Authors: Duan Qiu Hua , Yang Lu Feng , Lou Meng Lin
Published: June 2012

This paper mainly uses finite element method (FEM) to research how the bent-height influence on dynamic characteristic, acceleration reaction, dynamic water pressure, dynamic stress reaction of the aqueduct-water coupling structure seismic performance. Through calculation and analysis some significant results were obtained.
The Study on the Relationship between the Location of the Hole in a Levee and the Spread Characteristics of Shear Wave under the Condition of No Damping by FLAC3D Method
Authors: Yuan Meng Ling , Zhang Zhen Hua , Zhou Yang , Luo Xian Qi
Published: June 2012

This paper use FLAC3D method to analyze the dynamic response of some levee that has a cavity in it under the condition of no damping. The results show that there are good corresponding relationships between the shear wave spread characteristics, the horizontal position and depth of the hole, and the specific location of the holes in the levee can be determined. The results can provide references to the test of holes in levee.
The Optimal Allocation of Large-Scale Water Resource
Authors: Xu Chen Guang , Li Yue Peng
Published: June 2012

Large-scale water resource system with multi-water resources and multi-users consists of several independent supply and drainage network systems. It is hard to solve the problem well of large-scale water resource system with traditional planning method. We model the problem of optimal allocation of water resource using the principles of biological evolution, and eliminate the inferior by judging the optimization degree of each generation individuals, then produce a new generation, thus the optimal allocation of water resource is accomplished through iteration repeated. The disadvantage is that MOGA solution out of the quasi-global optimal solution, rather than the true optimal solution.
The Influences of Interpile Soil Reinforcement on the Performance of Structures with Double-Row Piles
Authors: Zhu Qing Ke
Published: June 2012

We established a calculation model for retaining structures with double-row piles by using the midas GTS finite-element software, considering the interaction between pile and soil and adopting the contact element method, on the basis of a practical engineering application. We then determined a reasonable elastic modulus of reinforced soil bodies, thereby enabling the study of the influences of the reinforcement depth and width in the interpile soil on the internal force and displacement of the retaining structure with double-row piles. We present suggestions for reinforcement depth and width. The study results provide valuable reference for engineering design, construction, and cost control.
Mesh Generation for Arch Dam Abutment Slip Block Based on Virtual Grid
Authors: Liu Xi Kang , Zhang Jian Hai , Yin Rong Gang , Yang Qiong
Published: June 2012

Abstract. In order to generate mesh for arch dam abutment slip block automatically, virtual grid method is proposed based on grid-based automatic generation algorithm. The proposed algorithm avoids generating initial grid in one time, but intersects the model with a series of plane sections firstly. Then form initial grid by using vector intersection method for adjacent sections. By modifying initial grid, a layer of mesh is formed. The algorithm proposed can better adapt to complex topography and generates hexahedral meshes for the block of arch dam abutment automatically. The method can present data for limit equilibrium analysis and numerical calculation method such as finite element method. Based on original topography and structural plane data, the automatic identification, generation and meshing of arch dam abutment block is accomplished.
An Application of Fuzzy Fault Tree Analysis for Large and Medium-Sized Pumping Stations
Authors: Cao Qiu Lin , Wang Xing Hua
Published: June 2012

Risk analysis for large and medium-sized pumping stations was conducted by using the theory of fault tree. Model was established for fault tree analysis on running risk of pumping stations. Structural importance of minimal cut sets was analyzed and compared on the magnitude based on the probability description of fault tree given. Then the major influencing factors were identified and risk rating of pumping stations was discussed. In addition, appropriate countermeasures were provided for management. And application example was given.
Study on Foundation Behavior due to Seepage Force of Groundwater
Authors: Meng Ling Yu , Yamamoto Haruyuki
Published: June 2012

Along with the vigorous developing construction in the world, the number of various underground engineerings is greatly increasing, such as the foundations of subways, tunnels, dams and high-rise buildings etc., where the attention is always paid to the seepage behavior in the soil around the structures. Seepage flow can lead to both horizontal and vertical displacement, but ground behaviors due to seepage force in traditional methods were rarely considered. In this paper, a 3D analysis is made on the foundation behavior due to seepage force of groundwater. The model uses the finite element method to study the problem and the model implemented by FORTRAN code is applied to predict the flow velocity distribution and deformation results of the simulated domain. The analysis shows that horizontal deformation caused by seepage flow plays a very important role in deformation field, which may lead to toppling behavior to the foundation of high-rise buildings.
The Study on Water Conservancy Project Control System
Authors: Wen Cen
Published: June 2012

This paper puts the theory of Multi-Agent into control automation, setting up a Automatic Control System of Water Conservancy Project Model based on Multi-Agent, applying Multi-Agent theory to Automatic Control System of Water Conservancy Project Model Test, and coordinating and solving a great deal of problems that exists in Automatic Control System at present through the communication among a lot of Agents, which will offer very important basis and advanced scientific means for Water Conservancy Project Model Test implementing intellectual control of real meaning.
Back Analysis for Mass Parameters of Tunnel Surrounding Rock
Authors: Cui Kai , Pan Xue Kai
Published: June 2012

Tunnel engineering information construction has been widely used, and the back analysis is its core. As the common useful method, displacement back analysis is of special advantages. This paper introduces the calculative method based on the application in a railway tunnel. The result shows that strain softening model can be used to simulate the large deformation mechanism of surrounding rock.
Research on Budget Quota Method Based on P3e/c for Hydraulic and Hydropower Engineering
Authors: Pan Fei Fei , Li Ning , Cao Yong Lei , Zhang Le
Published: June 2012

According to lacking a statistical method of resource and quantity under a unified standard in hydraulic and hydropower engineering construction, the budget quota method based on P3e/c was proposed. The hierarchy structure of data-frame of P3e/c and the data structure of budget quota were analyzed. The budget quota system based on P3e/c was developed by utilizing JAVA programming language. A certain hydraulic and hydropower engineering in southwest of China was taken as an example. The results indicate that the veracity, universality and efficiency of construction scheduling have been improved significantly by integrating budget quota and P3e/c. Moreover, it provides the basic data for construction scheduling statistic and analysis. The proposed method provides decision making basis for designers and managers.
Dams Risk Sequence Based on the Dam Defects
Authors: Yang De Wei , Sheng Jin Bao , Peng Xue Hui , Chen Ying Ying
Published: June 2012

Priority invested to conduct danger control and reinforcement according to the severity and risks of dams is a vital issue to Chinese government and administrative departments faced because of the large amounts of dangerous reservoirs. Dams risk sequence based on the dam deficiencies offers a new idea of danger control and reinforcement and its sequence decision-making.
Investigation on the Regulation Techniques for TongGuTan Shoal of Yangtze River
Authors: Zhao Zhi Zhou , Zhou Hua Jun
Published: June 2012

TongGuTan shoal is typical pebble shoals of branching reach with bend in upper course of Yangtze river. Based on 2D numerical model and physical model tests, the features of flow and sediment movement, obstructing-navigation mechanism be studied. In order to achieve permanent improvement of navigation condition, it is suggested to excavate straight channel for navigation. The new structure such as bags-filled-stones dam body, irregular concrete block have achieved the good effects. It provides a good example of dredging construction in flood season to the similar shoal.
Research on Reinforcement of Spiral Case during Capacity-Increasing Improvement for Gezhouba Hydropower Station
Authors: Wang Xian Jun
Published: June 2012

The stress and deformation of spiral case of Gezhouba Hydropower Station under three working conditions such as before the capacity-increasing improvement, during the disassembly of the spiral case and after the capacity-increasing improvement are calculated by three dimensional FEM..the reinforcement plan of spiral case is proposed based on the above calculation results and also analyzed by three dimensional FEM. Study on the results of different working conditions mentioned above shows that the unit disassembly scheme is feasible and the reinforcement plan is effective.
Experimental Study on Hydraulic Characteristics about Cylindrical and Semi-Cylindrical Protrusions
Authors: Wei Zhang , Wei Han
Published: June 2012

The cavitation regions of cylindrical and semi-cylindrical protrusions were experimentally investigated in non-circulating water tunnel. The cavitation numbers and structures of protrusions were compared under different velocities and aeration conditions, the common cavitation characteristics of protrusions were developed.
Small Hydropower Dam-Break Severity Degree’s Evaluation Model
Authors: Zheng Hao Yao , Sheng Jin Bao , Cheng Rong Liang , Peng Xue Hui , Sun Wei Wei
Published: June 2012

Power plant’s risk factors, the exposure of lower reaches and the capacity to deal with emergency are considered to establish small hydropower dam-break evaluation model. Calculating and analyzing the degree of severity of the Changlong Reservoir in Jiangxi Province，the quantitative indicators are obtained.
Study on Temperature Control Method of Yeywa Hydropower Station RCC Dam Construction
Authors: Xia Yuan Chun , Lin Dong Fei
Published: June 2012

Yeywa hydropower station RCC dam is located in the torrid zone of Asian, During the construction period, it meet Technical problem of temperature control in hot season. We can utilize the peculiarity of RCC that has a slow temperature rise due to hydration heat and a low early strength, according to analyse the blending and concreting procedure of RCC, adopt comprehensive and effective temperature control method, such as confirm concrete mix, control the temperature of raw material and RCC out of the batch plant, prevent temperature rise during transporting and concreting, setting joint to avoid structural crack and temperature crack. From Yeywa hydropower station RCC dam construction finished to now, no dangerous crack is detected, It accumulate experiences for RCC dam construction in high temperature place.
Study of Dam Deformation Model Based on Neural Network
Authors: Hu Wu Sheng , Zhang Fan , Song Lei , Wang Hao
Published: June 2012

Dam deformation analysis is one of the main tasks in dam safety monitoring. Regression analysis model is often used in dam deformation analysis in early days. At present, the statistical model, which divides the dam deformation into three parts, hydraulic pressure component, thermal component and ageing component, according to the causes of deformation, has been widely adopted in dam deformation analysis. The BP neural network model and the merging model based on BP neural network algorithm of dam deformation analysis are mainly discussed in this paper, and finally, the four models mentioned above are calculated and analyzed according to a specific project instance. The precisions are respectively ±1.19mm, ±0.38mm, ±0.34mm, and ±0.28mm for single linear regression model, statistical model, BP neural network model and merging model. So it is shown that the merging model is better than the others according to the results.
Settlement Analysis of Dock Slab on Soft Soil Foundation
Authors: Wang Hong , Wang Lan Huan , Liu Lei
Published: June 2012

According to the dock engineering, the paper analyzed the settlement and deformation of dock slab of soft soil foundation by using finite element software ADINA, and summarizes the law of the settlement and deformation based on different foundation model, to provide reference for the calculation and design of similar dock engineering.
Study on LD-Pumped Yb:YAG Rod Laser
Authors: Li Shuang Mei
Published: June 2012

The physical properties and characteristics of absorption and emission spectra of Yb: YAG crystal are analyzed in this paper. From the rate equation of quasi-three-level system ,We derive the rate equations of diode-pumped continuous work-end-pumped solid state laser and a theoretical analysis and optimization design for continuous LD end-pumped lasers are given.
The Posture of Airliner Forced Landing onto Water in Slide Decelerating Stage
Authors: Lan Min , Zhang She Sheng , Wu Yong Hong
Published: June 2012

The paper concentrates on the posture of airliner landing onto water in slide decelerating stage. For different angles, the difference equation is constructed to find the posture of airliner by using solid-fluid coupling, momentum conservation, motion equation and pressure drag. The results show that impact acceleration is inversely proportional to the sliding distance, the impact of stormy wave can make airliner out of balance, and course angle is 80 can minimize the chance of rollover.
3D FEM Analysis on Bearing Capacity Behaviors of the Multi-Piles Foundation for Offshore Wind Turbines
Authors: Tang Xiao Wei , Shao Qi , Liu Bin Xue
Published: June 2012

With the fast development of technology, offshore wind power generation is playing a major role for developing renewable sources in the whole world nowadays. According to the proposed Hangzhou Bay wind farm in China, using general-purpose finite element software, bearing capacity behaviors of the multi-piles foundation for offshore wind turbine are simulated in this paper by the 3D finite element method. The Mohr - Coulomb model is adopted as the elastic - plastic constitutive model of the soil and also the Coulomb Friction model as the pile - soil contact model. The bearing capacity behavior of multi-piles foundation for offshore wind turbines under monotonic and combined loading are discussed, also the bearing capacity behaviors by changing diameters, spaces of piles and loading directions as well.
Pattern Construction of Embankments Dwellings in Southeast of Henan Province
Authors: Cheng Yan Yan
Published: June 2012

The embankments dwellings in southeast of Henan Province have significant geographical characteristics and the uniqueness of which mainly reflected in the pattern construction of “inhabit by the water”. The formation of this kind of residential morphology is the result of long-term comprehensive effects of various factors, such as historical cultural heritage, molding of physical geography and climate conditions, as well as timing. It can not be realized overnight. The making of embankments dwellings reflects a series of plain ecological coping strategy and manifests unique regional experience of human settlement construction.
The Study on Hinterland Relevant to Container Port
Authors: Yang Yan Bing , Liu Bin , Zhang Biao
Published: June 2012

This paper aims to study the hinterland relevant to container port to provide theoretical reference for macroscopically layout and scale building of port. First we analyze competition characteristic and actuality of container port and the relationship between port and its interrelated hinterland. Second, we dissertate the necessity to estimate hinterland range of port and discuss a serious theoretical argument about port hinterland, and then after analyzing actual each method of partition port hinterland, we calculate hinterland occupancy rate of each container port in Liaoning province in China based on p–choice probability and the optimal path-searching algorithm and analyze relevant result. As last we obtain the conclusion that container scale building should according as it’s interrelated hinterland scale in the whole transport network, not any other factor, to avoid enormous invest waste that is brought by blind competition.
Study on the Dynamic Characteristic for Spar Type Floating Foundation of Offshore Wind Turbine
Authors: Zhang Ruo Yu , Chen Chao He , Tang You Gang
Published: June 2012

In this paper, the dynamic behaviors are studied for Spar type floating foundation of a 3kW in the 10m deep water considering the coupled wind turbine-tower-floating foundation and mooring lines and ocean environment load effects. The paper focus on the key issues of design of floating foundation, such as coupling dynamic analysis model and calculating method. The finite element models are established and dynamic responses of floating wind turbine system under different combinations of turbulent wind, constant current and irregular wave are calculated in frequency and time domain with SESAM software. The motion performance and lines’ tension are investigated, and some valuable conclusions are drawn. The results show that the Spar type floating foundation and mooring system can work in the ocean environment which significant wave height less than 2m, the designed large water-entrapment plate can minimized the motion of floating foundation obviously.
Simulation of Water Distribution Systems with Breaks
Authors: Xiao Di , Liang Jian Wen , Zhao Xin Hua
Published: June 2012

This paper presents a method for simulation of water distribution systems with breaks, in which, the leakage and low supply pressure can be considered. The effects of break location and extent on pressure variation of monitoring stations are simulated by numerical examples. It is shown that, the method can be used for estimating the effected area due to breaks; the high sensitivity may be achieved if monitoring stations are uniformly distributed; pressure variations are linear for small breaks and nonlinear for large ones.
Pilot Study of a Hybrid Process Combining Oxidation- Coagulation- Microfiltration for Drinking Water Production from Surface Water
Authors: Song Ya Li , Dong Bing Zhi , Gao Nai Yun , Yang Yu Fang , Chang Chun
Published: June 2012

In this study, microfiltration (MF) combined with oxidation and coagulation was investigated for production of drinking water by Huangpu River. The experiment focused on the effects of various oxidants on reduction in fouling and improvement in quality of treated water. 0.5mg/L of ozone, 1.5mg/L of sodium hypochlorite and 0.3mg/L of potassium permanganate were added before membrane to reduce the fouling. The results showed that significant differences in permeate water and trends of TMP exhibited by adding different oxidants. With ozone as pre-oxidation, permeate water could meet China Drinking Water Regulations (CDWR), however, part of water quality met CDWR with sodium hypochlorite and potassium permanganate as pre-oxidation. TMP increased slowly during filtration period for a long time when ozone and sodium hypochlorite were added. With potassium permanganate as pre-oxidation, rapid increase in TMP was observed, which can be attributed to a lot of manganese oxides deposited in the membrane by analyzing chemical cleaning water. Chemical cleaning of membrane could decrease TMP to initial level. Analysis of chemical cleaning solution indicated that organic matters was responsible for the most fouling, and ozone could reduce membrane fouling effectively.
High Rate BAF with Filter Media of Large-Size Lightweight Ceramisite for Micro-Polluted Raw Water Pretreatment
Authors: Lu Shao Ming , Yang Li , Li Shao Wen , Guo Jian Yong
Published: June 2012

On account of micro-polluted raw water, high rate up-flow biological aerated filter (HUBAF) is used to remove the ammonia nitrogen and micro organic pollutants in raw water. Using ceramisite as filtration media, at a diameter of 6mm to 10 mm, a surface density of above 1g/cm3 and a filtration rate of 16 m/h to 20 m/h, ceramisite layer is in a state of micro expansion, which is beneficial to keep a high nitrification efficiency. On account of raw water where NH3-N is below 4mg/L, NH3-N concentration t can be stabilized at less than 0.5 mg/L in HUBAF effluent. Since lack time of biochemical action, the CODMn removal rate by HUBAF is low. As the effluent of BAF carried abundant amounts of microbes and dissolved oxygen, it increased the CODMn removal rate by 11% in final effluent compared to the individual conventional process of “flocculation-sedimentation-filtration-disinfection”. The turbidity removal efficiency is only the 1/3 of ordinary BAF, which reduces the head loss and energy consumption, and multiple filters to share a centralized aeration system is possible. In addition, HUBAF system is aerated by the single-pore aeration filter heads under the filtration board, equipped with both up-flow and down-flow backwash systems and no need for extra grit chamber, HUBAF is convenient for maintaining and administration.
Aniline Removal by Simultaneous PAC Adsorption and Dominant Bacteria Biodegradation
Authors: Gao Yu Nan , Ma Xing Guan , Zhang Ping Ping , Fu Jin Xiang
Published: June 2012

Simultaneous powdered activated carbon(PAC) adsorption and dominant bacteria biodegradation process was evaluated for the aniline pollution accident existing in source water. The jar test results showed the aniline adsorption capacity and adsorption rate of the PAC were represented by the Freundich adsorption isotherm model. The aniline adsorption ability of the PAC was high when the temperature was low; the biological activity of dominant bacteria was high when the temperature was at 25°C and pH value was at 6. The poly-aluminum-chloride in combination with PAC and potassium permanganate in combination with PAC were compared with the simultaneous adsorption and biodegradation.
Effect of Soil Water Potential Controlling on the Rice Growth
Authors: Chen Wei , Chi Dao Cai , Tai En Bo , Zhang Xu Dong , Chen Tao Tao
Published: June 2012

Pot experiments were conducted under different status of soil moisture potential during different stages of rice. The results show that soil moisture potential regulation and control is able to increase the rice yield at each growth stages after returning green, the suitable soil water potential criteria for middle-season rice in Liaoning province at different stages is 5~10kPa in tillering initial stage, 35kPa at most in tillering final stage, 5~10kPa in jointing and heading stages, not more than 20kPa in Milk maturity stage; re-watering post drought has a compensation effect to rice whose soil suction potential is controlled in 5~10kPa at tillering initial stage according to the results that its tillers number, output, final root dry biomass and leaf dry weight were significant exceeding contrast; The research on rice quality indicates that water stress in jointing stage increase protein content but reduce eating quality.
Large Eddy Simulation of Gas-Liquid Two-Phase Flow for a Nested Type Fixed-Cone Valve
Authors: Liu Y.L. , Lv B. , Wei W.L.
Published: June 2012

large eddy simulation cooperated with a physical fractional-step method is applied to simulate steady flow around a nested type fixed-cone valve; and the equations are solved with the finite volume method. The free fluid surface is simulated by the VOF method. The pressure contours and vorticity magnitude are obtained. The modeling results conform to physical law, and show that the large eddy simulation theory has powerful capacity in simulation of microstructures of turbulent flows, and the function of the nested type fixed-cone valve for energy dissipating is good.
Simulation of Natural Ventilation of Workshop in Large-Scale Iron and Steel Enterprises Based on CFD
Authors: Long Yan , Liu Ke , Jin Shi Ping , Fu Yan
Published: June 2012

Method of CFD was adopted to carry out two-dimensional numerical simulations for internal natural ventilation process of a standard triple-span workshop in iron and steel enterprises with3 different layouts of heat resources. Flow states and relevant parameters of air-fluid in the workshop were obtained to come up with theoretical basis for design, optimization and process layout of natural ventilation in workshops.
Simulation Investigation of Mixed Absorption Refrigeration Air-Conditioning System
Authors: Liu Xi Bin , Du Jian Rong , Wan Jun Hua , Zheng Zu Yi , Xu Wen Ming
Published: June 2012

The mixed absorption refrigeration cycle which was suitable for the solar air-conditioning was presented. On the base of characters of working process, the models of each component were established in the paper. The universal module of thermo-physical properties of LiBr solution and water was written, control flow graph of program was given and simulation program of the mixed absorption refrigeration system was developed. The simulation results showed that the relations between LiBr solution concentrations and performance of mixed absorption system. The simulation program provided theoretical rules of optimization designs for commercial solar absorption air-conditioning.
Study on Heat Release Rate Model in Steel Bridge Highway Fire
Authors: Li Li Jun , Hu Zhao Tong , Liu Qiang
Published: June 2012

With the rapid development of the highway industry, the steel structure as the main Long Span Bridge build more and more, the highways are carrying more and more traffic than before and vehicle fires are becoming more frequent. This paper, (which is based on previous literature on the behavior of fire, and the main research method of fire heat release-rate) proposes a mathematical model for the heat release-rate of highway fires. Using the fire numerical simulation software FDS to do an analysis of the temperature field of an open space formed by a 300 mw heat release-rate reveals that the maximum temperature decrease is non-linear when the height increase.
Analysis of Dynamic Performance of Air-Cooled Condenser Structure System
Authors: Sun Ying , Hong Yan
Published: June 2012

In situ measurements on two power plants designed air-cooled condenser structure were described in this paper. Operating condition was divided into three types to test the structure system, and then obtaining the data of time-domain waveform and spectrum analysis in each condition. Cycle, frequency and vibration mode of the structure system were obtained by analyzing the data. Meanwhile, the structure was theoretically calculated using finite element program, gaining the cycle, frequency and vibration mode of the structure system. It was concluded that basic vibration mode of the structure system was space torsional vibration by comparison between theoretical values and measured values.
Numerical Simulation of Heat Transfer Characteristics of Dimpled Plate
Authors: Ji Chang Fa , Liu Xiao Bing , Liu Rui
Published: June 2012

Designed a new type of plate heat exchanger-dimpled plate heat exchanger, then conducted a three-dimensional numerical simulation on flow, heat transfer and resistance characteristics of 15 kinds of different sizes dimpled plate heat exchangers by Fluent software，obtains the impact of the dimples geometric parameters such as dimple diameter, dimple spacing, dimple height on the heat transfer and flow characteristics. The results show that in different Reynolds number, dimple diameter, dimple spacing and dimple height on the effect of the dimple plate heat transfer efficiency is quite similar, and the impact becomes increasingly evident with the Reynolds numbers increasing. The combined effect of plate heat exchanger is best when dimple diameter, dimple spacing, dimple height are separately 12mm, 21mm, 4mm in the 15 kinds of different combination dimpled plates.
Large Eddy Simulation of the Gas–Liquid Flow in a Cylindrical Cross-Sectioned Bubble Column
Authors: Wei W.L. , Zhao X.J. , Liu Y.L. , Yang X.F.
Published: June 2012

This paper is concerned with the numerical study of gas–liquid flow in bubble columns by large eddy simulations (LES). The Euler–Euler approach is used to describe the equations of motion of the two-phase flow. The mean velocities and the fluctuating velocities are obtained. It is found that, when the drag, lift and virtual mass forces are used, the computed results in agreement with experimental transient behavior can be captured.
Research on the Model Test of Super Stream Duct(SSD)
Authors: Feng Feng , Chang Xin , CHENG Xiang Ru , Wang Chao
Published: June 2012

Super Stream Duct(SSD) was a new-type hydrodynamic energy-saving device. This paper designed the test model of Super Stream Duct. The resistance trial and the self-navigation trial of the model ship with the super stream duct equipped were proceeded. The influences of geometry shape and the installation position of SSD on the energy-saving effect was analyzed at different flow speeds. The experimental results have shown that the Super Stream Duct can save energy when the ship installed the SSD. When the open angle of profile was 12°(type B), the distance between the SSD and propeller disc was 40mm, the effect of saving energy was the best.
Test and Application of Polypropylene Concrete Bar Shell Bolting Shotcrete Support System in Soft Rock Drift
Authors: Pang Jian Yong , Wang Ling Yan
Published: June 2012

The polypropylene bar shell bolting shotcrete and support system was studied on the basis of the analysis of the mechanics principle of shell structures. The technique feature is a kind of specially three-dimensional bar-mat reinforcement instead of three-dimensional bar-mat. It has very high mechanical property and was applied in difficult drift without profiled bar, anchor bolt, grouting and so on. The model experiment was done by relying on the industrial test on the broken laneway of Xishan Coal Power Company. The distortion, destruct shape, developmental rule of the supporting system were examined while the stress and strain distributing rule and also the ultimate load were obtained. The application showed that without reducing the carrying capacity of supporting the case, and heavy metal stent compared to the steel supporting the form of reduced consumption and the amount of concrete rebound, and has good flexibility, is all excellent soft rock drift Jean pressure retaining structure, and has good prospects for widespread application.
Research on Small Basin Human Settlements in Loess Plateau Base on GIS
Authors: Yu Chun Long , Zhou Ruo Qi , Huang Jin Cheng , Li Ni
Published: June 2012

With the wider use of digital technology in the scientific study, a research on small basin human settlements in the Loess Plateau is conducted with the overwhelming computational technologies to calculate and express. In this research, the small basins of Jiangjia River in the Loess Plateau, which is under a typical geographical circumstance, is taken as an example. In terms of the evaluation on the suitability of the natural environment of small basin human settlements in Jiangjia River by adopting the GIS functions, the detailed information on site selection, scale defining and village distribution characteristics is collected. Finally, this research is to figure out the principles which can control the future development and plan for small basin human settlements in the Loess Plateau gully region. Through the concrete research on the typical cases, it is concluded that the digital technology is supposed to be the universal means and approach to study the small basin human settlements in the Loess Plateau.
Study on Stochastic Model of Baseline Estimation of GPS Reference Station Network
Authors: Guo Qiu Ying , Hao Guang Rong , Zhao Tong Long
Published: June 2012

Baseline estimation is one of the most important links in the data processing of GPS reference station network. Exact definition of functional model and stochastic model of baseline estimation must be required to achieve high precise baseline solutions. The effects on precision of GPS long baseline estimation of three stochastic models are analyzed and compared by computation experiments using observation data of GPS reference station network. Calculation results show that using refined stochastic model can reduce convergence time of baseline solution. For baselines about 100km long in GPS reference station network, baseline precision of float and fixed solutions can be improved about 0.10m and 3mm respectively by satellite elevations compared with standard stochastic model using 10~40 minutes’ observation data and baseline precision of float and fixed solutions can be improved about 0.15m and 5mm respectively by estimated stochastic model based on theory of stationary stochastic process compared with standard stochastic model.
The Research of Urban Fundamental Geographical Information System Based on WebGIS
Authors: Chen Yi Qiang , Xiao Hai Ping , Liu Wei
Published: June 2012

Along with the rapid development in the Internet network technology and the constant improvement in the GIS technology as well as the urgent demand for geographic information sharing and mutual operation application, WebGIS has become a hot issue in the field of the GIS application. WebGIS has made up for the traditional limitations of the GIS application, thus making GIS achieve the function of true information data sharing. In such case, it accelerates the process of informationalization of the city fundamental geography. Therefore, it has strong promotion and the application value.
GPS-InSAR Data Integration Method and its Application
Authors: Jiao Ming Lian
Published: June 2012

The powerful tool of GPS-InSAR integration is drawing more and more attention in deformation monitoring. This paper introduces firstly method of atmospheric corrections and orbit errors to InSAR images using GPS datas. Then, the scheme of GPS-InSAR data integrating is expounded, Finally, Analysis and examples prove that GPS and InSAR technology has highly complementary. On the one hand the GPS provides good approach for resolving sensitivity that the InSAR opposite to atmospheric parameters change and the orbit error correction, on the other hand, we can use GPS technology to raise the InSAR spatial resolution , and are able to monitor surface deformation in millimeter-level precision. Therefore, using GPS-InSAR integrated technology will break through the technical limitations of a single application. They play each of their respective advantages, which greatly improve the resolved capacity in space domain and time domain, so as to provide better services to monitor the surface deformation.
Design and Research of Coalfield Geodetic Survey Control Point Result Information Management System Based on GIS
Authors: Xie Rui , Liu Xiao Qiang
Published: June 2012

Coalfield control survey results are work foundation of coalfield construction and whole engineering surveying and initial data of coalfield-exploration surveying and mapping. Digital information management system is an inevitable trend to coalfield control-survey data digital management. The paper introduced the design of information management system of control point results in coalfield geodetic survey based on GIS. It contained the system architecture, function module, safety management module and others. The realization of the system can make standardized management, information processing and sharing, and security of coalfield geodetic survey results effective improvement. It has an important meaning and strong practical value.
The 3D Virtual Campus Modeling Based on High Resolution Images from Remote Sensors
Authors: Wu Zhen Zhi , Wen Hong Yan , Lan Gui Wen
Published: June 2012

With the high resolution remotely sensed image and an old map of the Pingfeng campus of Guilin University of Technology, 3D virtual reconstruction, roaming and buildings management of the campus were accomplished by the usage of ArcGIS to get basic geographic information, applying SketchUp to create 3D models and ArcEngine to develop a management information system. This method takes full advantage of existing data sources and can quickly build a 3D visualization information system.
A Registration Algorithm of Sensor System Errors Based on Innovation Correlation
Authors: Zhang Pi Xu , Wang Hang Yu , Shi Zhang Song
Published: June 2012

In order to eliminate the influence of sensor system errors on detecting precision, the intersection of sensor locating globes is modeled with Earth-Center Earth-Fixed coordinates as transitional characters and to be eliminated, and a self-adaptive filter is presented to register sensor system errors for multi-platform, which identifies model characters and error characters on line by innovation correlation function sequence based on real-time mutual observation of platforms. Contrastive simulations against traditional registration algorithm show that the registration algorithm based on innovation correlation can converge quickly with high precision.
Study on Determining Method of Surface Movement Parameters Based on MATLAB
Authors: Zou You Feng , Chai Hua Bin
Published: June 2012

It is difficult to accurately calculate the predicting parameters of surface displacement of mining subsidence. Based on the measured data of the ground movement observation station in North China, The probability integral method is taken as mathematical model of Surface movement parameters fitting, the curve-fitting of the measured data is carried out by using Matlab’s efficient data processing and mapping function, thus it becomes easy to obtain accurate predicting parameters of mining subsidence. By comparing the measured data with the curve-fitting results, the research shows that the fitting results based on Matlab is more accurate, and meet the requirements of practical engineering. It is important and practically significant to improve the predicting accuracy of mining subsidence, give scientific and rational guidance to mining under the buildings, railways and water bodies.
The Quantum Tunneling Effect of Internal Global Monopole Black Hole
Authors: Jiang Qing Quan
Published: June 2012

Considering energy conservation, the tunneling effect of internal global monopole black hole is deeply studied in the Parikh-Wilczek’s tunneling framework. The result shows that the emission of the particle on the event horizon is relation to the change of Bekenstein-Hawking entropy and the spectrum is a not pure thermal one.
Comparative Study on GPS Height Fitting Models Based on Kriging Estimation
Authors: Niu Zhi Hong , Song Meng Bo , Chen Ji Qin
Published: June 2012

Currently, the study on GPS height determination is mainly focused on changing GPS geodetic height into normal height by applying to mathematical models to fit a quasi-geoid and calculate the height anomaly value with high degree of accuracy. This paper illustrates the basic principles of Kriging Method GPS Height Fitting, Kriging Method GPS Height Fitting Based on Polynomial Surface, and Kriging Method GPS Height Fitting Based on Wavelet Analysis, and carries out a comparative experimental study by using the measured data of GPS control network. The results show that the fitting accuracy of the collective model based on Kriging Method is better than that obtained only through a single Kriging Method, and the GPS height fitting accuracy obtained through Kriging Method Based on Wavelet Analysis is the most accurate.