bluuebunny/crossref_metadata_2025 huggingface dataset:
Interaction between Cationic Nano Microsphere and HPAM
Authors: Liu Yue Liang , Shen Jin Wei , Li Guang Hui , Zhang Gui Cai
Published: March 2013

This paper intends to deal with one novel profile control agent formed by combination of HPAM and cationic microspheres with different cationic density (CD) by the method of micro-emulsion polymerization. Profile control is of great importance in well stimulation for current oilfield with high water cut. The main profile control agents now are polymer or polymer microspheres. Each of these agents has its own performance advantages. The novel profile control agent is equipped with the advantages of both the agents mentioned above. Analyzed by transmission scan electron microscope (TSEM) and laser particle sizer, the particle size of the original synthesized microsphere and the swelled microsphere in water are 50-100nm and 1-3μm respectively. Analyzed by micro-electrophoresis, the surface potential arrives at its highest value at 30% of the cationic density; aggregation happens when CD is low and the electrostatic force is insufficient to keep the system stable. Due to electrostatic interaction, the synthesized system flocculates at a concentration of 0.02% separately. Measured at varied shear rates, the viscosity of the system can be significantly enhanced by electrostatic interaction. However, this enhancement is not obvious when the salinity is higher than 3%, which indicates that the increasing of viscosity is closely related to the salinity of solution. Moreover, by increasing hydrolysis degree of HPAM, the viscosity of the system can be improved by 20% additionally. Through core displacement test, the synthesized system is proved to have relatively good profile control performance.
Recovery Gemanium from Pulverized Fuel Ash through the Method of H2SO4-NH4F-NaClO3 - Leaching-Tannin Precipitation
Authors: Pu Shi Kun , Lan Yao Zhong , Li Yan Jun , Zhang Zhong Hui
Published: March 2013

This paper will conduct a systematic study on method of recovering Ge from pulverized fuel ash in Lincang prefecture, Yunnan province. Details are like this, in view of the fact that Ge contained in pulverized fuel ash is wrapped up by a lot of Silica, Cao, magnesium oxide and is difficult to react with hydrochloric acid, so, first, have the pulverized fuel ash grinded to 200 meshes; then, ammonium fluoride should be put into 85-90°Cdilute sulphuric acid solution to produce hydrogen fluoride so as to destroy silicon dioxide and calcium oxide contained in the pulverized fuel ash. Meanwhile, dilute sulphuric acid solution dissolves magnesium oxide, by doing so, Ge will be released to react with sulfuric acid and produce Sulfuric acid Ge, and Ge will go into the solution；as for low state Ge（e.g,GeO,GeS）contained in the pulverized fuel ash which is difficult to be dissolved by sulfuric acid, sodium chlorate will be used as a kind of oxidant to change bivalence Ge into tetravalence Ge, then dissolve it into the solution, after the liquid-solid separation, sulfuric acid leaching solution rich in Ge will be obtained. Then, tannic acid will be used as precipitant to recover Ge from the leaching solution, and Ge concentrate will be produced through distillation and roasting. After this, put Ge concentrate on hydrochloric acid distillation to get germanium tetrachloride, After going through strenuous evaporation, distillation and hydrolysis, germanium dioxide with high purity will be yield. This paper has conducted conditional tests and discussion on the process parameters which will influence recovery Ge from pulverized fuel ash, including the dosage of Sulfuric acid, ammonium fluoride, sodium chlorate ,tannic acid and extraction time to find out the prior controlling condition of Ge recovery，under this prior condition, Ge leaching rate is as high as 84%，and tannic sinking Ge rate is as high as 98%. The pulverized fuel ash, after recovering Ge, can be used to backfill the mine pit, besides, most of the lixivium after recovering Ge can be recycled, and the rest of it will be released after neutralized up to the standard by lime. This process enjoys the following quality: high Ge recovery rate, less time used during the process ,less consumption of auxiliary material, easier to control the process, avoiding the potential pollution on the environment and lower cost involved in it, therefore, which is a kind of efficient and economic process of recovering Ge from pulverized fuel ash.
Fabrication of Silver Nanostructures by Microwave-Assisted Method
Authors: Hu Yun Rui , Yang Yang , Hu Yong You , Lai Chen , Xi Ting Fei
Published: March 2013

With polyvinyl pyrrolidone (PVP) as stabilizer and polyethylene glycol (PEG) as reducer, silver nanostructures were synthesized by microwave-assisted method. The morphology, size and crystal structure of silver (Ag) nanostructures were investigated by SEM and XRD. The results showed that the Ag nanostructures could change from nanoparticles to nanowires by introducing Cl-. The growth speed of nanowires could be controlled by changing the reaction power, thus Ag nanorods and Ag nanowires with different length could be obtained.
Water Jet Shot Peening Strengthening Surface Roughness
Authors: Dong X. , Guo R.Z. , Song S.W. , Zhuo C.Y.
Published: March 2013

Shot peening pressure, nozzle scanning velocity, and target distance were chosen as effect factors when shot peening test to 45 steel and 2Al1 aluminum alloy material was made by water jet. Adopted stylus method for measuring shot peening surface roughness Ra and Ry, observed macroscopically shape character of shot peening surface by scanning electron microscope. The results indicated that shot peening pressure, nozzle scanning velocity, target distance caused uniform effect rules on shot peening surface roughness of 45 steel and 2Al1 aluminum alloy material, surface roughness Ra augments as the increase of shot peening pressure and minishs as the increase of scanning velocity, furthermore, there exists the biggest surface roughness target distance. When shot peening target distance was less than the biggest surface roughness target distance, surface roughness Ra and Ry tend to augment as the increase of target distance and inversely proportional to the material strength. When gives less original surface roughness and lower shot peening pressure, it’s not suitable for using Ry to represent shot peening surface roughness but Ra. When shot peened excessively, the surface of the material occurred body exfoliation and corrosion.
Design of MK1432/H CNC Precision Cylindrical Grinding Machine
Authors: Wang X.J. , Fu X.G.
Published: March 2013

MK1432/H CNC precision cylindrical grinding machine is suitable for precision grinding IT6 to IT5 cylindrical or conical revolving workpiece, the table of the rail bed for the paste with plastic rail, the first holder of the rotating dial tone from the motor frequency speed, with Germany's Siemens 810D CNC two-axis system, built-in PLC, liquid crystal display. Servo motor is 1FK6 series; configure automatic measuring instrument line detection, automatic grinding work to achieve closed-loop cycle, ensuring high machining dimensional accuracy. Machine bed using a large round hole, fin-shaped reinforcement plates, Bench points up and down the table, you can grinding conical, bed and table in the guide rail for the laminating, the friction coefficient is small, table driven by a servo motor directly to the Deputy move the ball bar, smooth and reliable movement. Mainly used in automobile, motorcycle parts factory and other machinery manufacturing industry, for the grinding disc type, short axis, and taper shank type etc. parts.
Rotor Combined Design for High-Speed PM Machines
Authors: Wang Tian Yu , Cheng J.T. , Zhang C.
Published: March 2013

It is quite different to design a high-speed and high frequency machine than designing a common machine. Strength and dynamic characteristic analysis of rotor are key techniques for high-speed permanent magnet (PM) machine. Rotor combined design should be investigated based on mechanical with electromagnetic and dynamic properties analysis. The finite element method is used to analyze stress and electromagnetism field and dynamic characteristic. The multi-physics field iteration design is carried out by optimization analysis of the finite element software. A high-speed PM machine with rated speed of 60000 rpm, 75kW is presented with this method. The experimental measurements validate the correctness of this method.
The Influence of the Leading Wheel Structural Change on Stress of Multi-Rope Friction Hoist
Authors: Zhou Guang Lin , Chu W.J.
Published: March 2013

To avoid the open problems of the leading wheel and get a more rational structure, the paper uses PRO / E and the finite element software to analyze the leading wheel of JKM-3.25/4 multi-rope friction hoist. The results show that in the leading wheel the rib plates between the channel steel and wheel hub are removed or added the same ones will have little effect on the overall force situation, and only affect the stress of the weld bead. To solve the problem of open weld of rib plates, can consider the rib plates to be removed. When the radial angle between support wheel and drum is bigger than 6°, the overall force of the leading wheel is affected seriously. But when the radial angle is 5°, the amplitude of stress fluctuation is the minimum, which can improve the leading wheel working conditions and increase the service life of the leading wheel. Therefore the suggestion is to take the radial angle of 5° when to design the new multi-rope hoist. Study conclusions provide the theoretical supports for the leading wheel of multi-rope friction design and technical renovation.
Analysis of Effective Pre-Stress of Continuous Rigid Frame Bridge in Service Based on Inversion Theory
Authors: Zhang Zhao Ning , Li Ke Xing
Published: March 2013

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.
Research on Prediction Model of Support Vector Machine Based Land Subsidence Caused by Foundation Pit Dewatering
Authors: Li Zhi Guang , Zhou Hai Hui , Xu Yun He
Published: March 2013

Foundation Pit Dewatering always arouses surrounding land subsidence that has significant influence on the neighboring environment and even leads to serious natural disasters. So an accurate prediction of the settlement is the precondition of forecasting and evaluating the Foundation Pit Dewatering environment influence. Using the distance from settlement points to Foundation Pit, Equivalent compression modulus, the drawdown, Supporting structure stiffness and equivalent permeability coefficient as the independent variables, adopting the 38 groups of Engineering practical monitoring datas as the samples to establish the prediction model of Land Subsidence caused by Foundation Pit Dewatering based on Support Vector Machine theory. The project trial result shows that compared with traditional empirical method, the model possesses bigger forecast precision.
Effect of Different Compaction Methods on Bridge Pavement
Authors: Hou Jing Ru , Zhao Li Jun
Published: March 2013

In order to analyze the influence of different compaction methods on bridge deck vibration and bridge pavement compaction quality, the field test and laboratory test of oscillating compaction and vibrating compaction were carried out. The results demonstrated bridge deck vibration caused by the intrinsic exciting force of compactor contributed to vibrating compaction. On the pattern of oscillating compaction, the disturbance of bridge deck due to the exciting force of compactor is the main factor to induce bridge vibration. Furthermore, the vibration acceleration and amplitude in lateral, longitudinal and vertical direction, oscillating compaction are much smaller than that of vibrating compaction. Compared with vibrating compaction, the rolling efficiency of oscillating compaction is obviously higher and the final compaction degree also is much higher. Besides that, phenomenon of crushing the coarse aggregate is exists in the compaction construction, in which the effect of vibrating compaction on crushing the coarse aggregate is more obvious than oscillating compaction, and the range of crushing the coarse aggregate caused by vibratory compaction is larger than oscillating compaction.
Analysis of Surface Subsidence Rule of the Shallow Subway Tunnel Construction
Authors: Wang Fei Fei , Bai Hui Ren , Li Jing Jing
Published: March 2013

In order to study the Dalian Metro section 202(Cujin Road station-Chunguang Street station, which is shallowly buried and covered with plain fill)’s ground surface settlement, the monitoring measuring station was built during the construction. After 3 months’ measuring by precision level,the data shows that the maximum point is in the center line of the tunnel of the upper part. The settlement is about 25.66-31.82mm. This paper put forward the concept of the distance span ratio β, β effective value range was - 4 <β< 4,Surface subsidence is closely related with β, Severe surface subsidence stage is -2 <β< 2, Occupy whole deformation is 67.5-77.6%,settlement rate about 0.84-0.93mm/d, so should strengthen the monitoring frequency, Suggest increases site tour. Field test results and the ground surface settlement calculation model winkle are identical with each other; the monitoring results have important guiding significance and reference for Dalian subway and the similar shallow depth excavation tunnel construction.
Experimental Study on Fiber Concrete Lining in Tunnel with Seismic Dynamic Response
Authors: Zhou Jia Mei , Meng Guo Wang , Hu Yao Yao , Xu Cai Zhang
Published: March 2013

Sesmic dynamic response of Fiber Reinforced Concrete tunnel lining is studied in contrast to the plain concrete. Based on similar theory, model test has been carried out through the 5m×5m triaxial shaking table by inputting sesmic wave, then the damage characteristics of tunnel lining is acquired.The test results show that both the plain concrete and fiber concrete is brocken by sesmic load, but fracture form is not the same,the crack on Fiber concrete is narrow and sawtooth , the crack on plain concrete is wide and straight.Fiber concrete lining strain-time curve is sawtooth partly, it’s vibration reponse is a little lagger than that of plain concrete.It indicats that kinematic velocity of concrete granule is decreased and sesmic energe is absorbed by fiber cohesive force,then frequence amplitude can be reduced.So fiber concrete can be proved as fine anti-seismic material.
Reasons and Control Countermeasures of Special Soft Coal Roadway Deformation in Liangbei Coal Mine
Authors: Cheng Le Tuan , Zhang Jia Lin , Zou Zheng Sheng , Li Qing Bo
Published: March 2013

B1 coal seam located at -550m level in Liangbei Coal Mine is a typical "three-soft" seam. The coal roadway with a depth of 610-750m lies under the critical softening depth of the roadway, and its support difficulty coefficient is 1.5-2.0. The coal has poor air permeability, high gas content and high gas pressure, so danger degree of the gas outburst is relatively strong. The coal seam was destroyed in a disastrous state by more than 100 boreholes for gas outburst prevention during the excavation. This results in the difficulty in the roadway support. Engineering geological characteristics of the coal roadway at 11 mining area are introduced. Based on the engineering geo-mechanics method, the reasons of deformation and failure of the coal roadway are analyzed. In view of problems in excavation and support, as well as the type of the coal roadway deformation mechanism, the borehole parameters are optimized for the gas outburst prevention, and bolt-net-cable coupling support with high convex steel-belt is used to control the coal roadway stability at 11 mining area. Practice shows that the effect is fine.
Research on Shenyang Metro Line I Engineering underground Structural Waterproofing Technology
Authors: Zhu Zhan Guo , Yao Chun Yan , Zhao Yue , Tang Zhi Yang , Zhao Yu
Published: March 2013

Subway engineering is a long range program. Metro structure waterproof is a major technology to ensure the durability of structure. With the experience accumulation and technical maturity of our country's subway construction, waterproof technology is developing fast. The design concept and material of underground waterproof stay updated. According to the Shenyang subway metro construction experience, this article do a research on the on the cold regions based on the geological conditions and climate characteristics. Focusing on the subarea waterproof and natural sodium bentonite soil waterproof blanket are described, this article make a detail analysis on the proof about the design concept, waterproofing system, material selection, construction technology and other aspects. The content of this article has been in the works in practical application, which can provides reference for other similar project .
Joint Issue Discussion on Cement Concrete Pavement
Authors: Wang Dong Ya , Fei Wei Shui
Published: March 2013

Concrete pavement joints are an important part of the cement concrete pavement, and joints are the weak link of the concrete pavement. It is also one of the main causes of early diseases and failure of cement concrete pavement. This paper summarizes the outcome of the predecessors, introduces the research status of the joints, and analysis the joint destruction and its cause from the point of view of the stress.
Study on Roadbed Soil Dynamic Resilient Modulus Test
Authors: Xu An Hua , Fang Jian Hong
Published: March 2013

This paper draws on the successful experience from domestic and abroad researches, testing repeatedly of powder subgrade with load triaxial tests, analyzing the relationship between the subgrade soil resilient modulus, deviatoric stress, water content and degree of compaction. At the same time, conducting corresponded roadbed soil resilient modulus forecast model, and qualifying its correctness of test data model.
Study on the False Joint’s Layout Mode of Unit Double-Block Ballastless Track Bearing Layer
Authors: Wei You Xin , Chen Jiang
Published: March 2013

The false joint of bearing layer is one of the engineering measures to guide the crack development, in unit double-block ballastless track, it’s usually designed in staggered arrangement with expansion joint of track concrete layer. According to the actual situation, this seam layout is unreasonable. So the thorough study on the design scheme of false joint is presented. The distribution of stress in bearing layer, under temperature load, is first computed, the result shows the bearing layer under expansion joint is more prone to cracking than that at other positions. Then compares the theoretical response got from two different kinds of seam layout under train load. Finally, the false joint design is optimized on the basis of project experience. A conclusion is drawn as follows: the false joint and the expansion joint ought to be aligned in general case, and the false joint setting in the middle of the unit should be canceled. But, when the railway is built on a unstable the lower foundation or in a area with plenty of rainfall, the false joint design ought to adopt the optimized arrangement of break joint.
Elastic-Plastic Seismic Response Analysis of High-Rise Building with Transfer Storey
Authors: Nie Jing Wei , Liu Hong Bing , Fang Zhao
Published: March 2013

The research on elastic-plastic dynamic response analysis of the high-rise building with transfer storey is carried out under different earthquake record inputs.The displacement time- history response of the top floor and the transfer storey, also the displacement envelope diagram and interlayer drift angle envelope diagram are obtained.Theoretical reference for the design of the weak layer is provided.
Research for Vehicle Load and Load Effect After Earthquake Based on Simply Supported Beam Bridge
Authors: He Peng , Ge Sheng Jin , Zhai Min Gang
Published: March 2013

Monte-Carlo was applied to generate random traffic flow after frequent, moderate and rare earthquake respectively based on sample of vehicle investigation in“907”Zhaotong, Yiliang earthquake (2012), Yunnan province, considering vehicle parameters, such as types, driving, distance, ratio in earthquake-relief campaign. Vehicle load effect was analyzed for different spans of Simply Supported Beam Bridge, then characteristic value of lane loading which ruled by 《General Code Designs of Highway Bridges and Culverts(JTG D60-04)》(China) was revised. Research can not only provide standard for rapid estimate and repair of bridge after earthquake, but also give theoretical basis for revising anti-seismic codes or guidelines in China.
Analysis on Seismic Damage of Timberwork Building and Reinforcement
Authors: Liu Rui , Hou Mu Yi , Liu Xiao , Wang Ru Heng
Published: March 2013

In this paper, the timber structure buildings in the quake damage situation has been summarized. Analysis the rules and characteristics of ancient timber structures in seismic damage. Put forward basic methods for ancient timber structures in strengthening.In order to provides basis and method for timberwork seismic repair or reinforcement.
Properties of the Solution Set for Generalized Equilibrium Problems with Lower and Upper Bounds in FC-Metric Spaces
Authors: Wen Kai Ting
Published: March 2013

The equilibrium problem includes many fundamental mathematical problems, e.g., optimization problems, saddle point problems, fixed point problems, economics problems, comple- mentarity problems, variational inequality problems, mechanics, engineering, and others as special cases. In this paper, properties of the solution set for generalized equilibrium problems with lower and upper bounds in FC-metric spaces are studied. In noncompact setting, we obtain that the solution set for generalized equilibrium problems with lower and upper bounds is nonempty and compact. Our results improve and generalize some recent results in the reference therein.
A Constraint Model for Interface Stress Element Method without Virtual Elements
Authors: Feng Biao , Liu Hong Shuai , Lan Ri Qing
Published: March 2013

The traditional constraint model employed in Interface Stress Element Method is cumbersome due to the using of additional virtual elements. To remedy this, a new constraint model without virtual elements was proposed, based on the introductions of constrained interface, formula for stress mode on bound boundary and governing equations considering geometric boundary conditions. With the elimination of virtual elements, constraints can be treated more naturally and simply. Programs based on this model were developed and numerical examples were provided to demonstrate the validity and convenience of the presented technique.
An Interference Fitting Algorithm of the Oil Well Structural Stresses Calculation Based on the Concrete Solidification Process
Authors: Yang Zhi Fu , Meng Qing Yuan , Zhong Kang You
Published: March 2013

The oil well structure is comprised of stratum, concrete sheath and the steel casing. In petroleum engineering, the liquid concrete is usually poured into the annular gap between the well bore and the steel casing to form a concrete sheath. During the solidification process of the concrete, its volume and mechanical parameters may vary with time and the chemical solidification stresses will therefore be generated. At the same time, the concrete sheath is under the loading of the ground stresses and the hydraulic pressure of the drilling fluid in the casing. Nowadays, most of the researchers calculate the stresses distribution of the oil well concrete sheath based on the external loading only and the solidification process is ignored. In this work, an interference fitting algorithm in consideration of the concrete solidification process is proposed and the external loads such as ground stresses and drilling fluid hydraulic pressure in the steel casing are also considered. The calculated results show that the stresses of the concrete sheath are mainly dependent upon the hydraulic pressure of the liquid concrete and the chemical solidification stresses, rather than the external loads. In addition, an experimental facility used to simulate the oil well structure under the ground stresses is designed in this work, and the results of the experiment verified the conclusion mentioned above.
A TF-Contractive Fixed Point Theorem in a General Metric Space
Authors: Xiu Zong Hu
Published: March 2013

We establish a fixed point theorem in the generalized metric space introduced by M.oradi and Beiranvand for mapping satisfying a general contractive inequality. The obtained result can be considered as an extension of the theorem of Moradi and Beiranvand.
Analysis on Concrete Neutralization and Life Evaluation of Reinforced Concrete Chimney
Authors: Li Yan Hui , Zhang Yang Yang , Wei Jing Cun , Wu Yun Feng
Published: March 2013

Through calculation and analysis on routine examination and neutralization of reinforced concrete chimney, the service life of concrete structure was evaluated only considering neutralization of concrete single factor. The results show that the neutralization of the reinforced concrete chimney was serious than that of other similar projects. The initiation time of reinforcement corrosion were 19.3a, cracking time of concrete cover were 27.35a.
Study on Nonlinear Multi-Objective Optimization for Concrete Mixed Proportions
Authors: Zuo Shuang Ying , Cai Hua Long
Published: March 2013

In the process of the optimization of concrete mixed proportions in the gravity-type dam of the upper reservoir in Yixing Pumped Storage Power station, potential problems of initial mixed proportions are analyzed and a set of nonlinear optimized multi-objective is drawn up. A stepwise regression analysis and duplex optimized method are used to solve optimized multi-objective model. By increasing the order of regression equation and softening the variables, objectives and constraints system, the shortcoming of linear optimization such as narrow variation span, severe formal limitations of objective and constraint function can be overcome and the flexibility of the choice for optimized objective is easily to be achieved. Combined with the traditional linear regression method, the results of optimization have been corrected further. The practical effect shows that the work achieves very good technical and economic benefits with a smaller amount of test work to reduce the project cost.
Experimental Research on Mechanical Properties of Recycled Aggregate Concrete under Uniaxial Loading
Authors: Zhao Xue Yong , Duan Mei Ling
Published: March 2013

The complete stress-strain curves of recycled aggregate concrete with different recycled coarse aggregate replacement percentages were tested and investigated. An analysis was made of the influence of varying recycled coarse aggregate contents on the complete stress-strain curve, peak stress, peak strain and elastic modulus etc. The elastic modulus of RC is lower than natural concrete (NC), and with the recycled coarse aggregate contents increase, it reduces. While with the increase of water-cement ratio (W/C), recycled concrete compressive strength and elastic modulus improve significantly. In addition, put forward a new equation on the relationship between Ec and fcu of the RC.
Timber and Chinese Architecture
Authors: Han Fang , Wang Shou Feng
Published: March 2013

Timber, a traditional construction material that was almost forgotten. Timber structure building got a qualitative leap in structure form, mechanized producing craftmanship and matching products, along with social progress and technology improvement. This paper will summarize modern timber structure forms by comparison with popular constructional material, like concrete and steel, in five aspects including life-cycle energy consumption, structure form, construction cost, construction period, seismic performance. Timber's advantages and disadvantages in architectural design will be listed, which may provide theoretical basis for diversified choice of construction materials in architectural design.
Mechanical Behavior of Super-Elastic Home-Made NiTi Shape Memory Alloy Bar in Tension
Authors: Zhou Hai Jun , Liu Hai Feng , Huang Hong Hong
Published: March 2013

An experimental study on mechanical behavior of home-made super-elastic NiTi Shape Memory Alloy (SMA) bar subjected to tension was made. The SMA bar specimen was 8mm in gage diameter and 50mm in gage length. The experimental tests were carried out by applying repeated cyclic loads. The tested tension strain amplitudes were 1%-7% and material phase was austenite. The mechanical characteristic parameters, such as phase transformation stress, deformation module, residual strain, energy loss and equivalent damping were studied. The effects of strain amplitude, loading rate and loading cycles on these parameters were analyzed. The considerable super-elasticity and stable cyclic behaviors of home-made SMA bar during the test showed its great application potential in aseismic devices.
The Mechanical Properties of Recycled Aggregate Concrete
Authors: Li Zuo Shan , Xie Li Hui , Luo Jun Ya , Zhang Xiang Chao
Published: March 2013

The experimental investigation of the preparation process of recycled aggregate concrete (RAC) using the waste concrete as recycled aggregate concrete (RCA) was reported. By conducting a series of laboratory experiments, the crushing and sieving procedure of wasted concrete to produce RCA were studied, the RACs with different strengths were designed, the strengths of hardened concrete were investigated. The results indicated that the representative strength for designing C10, C15 and C25 grade RAC using RCA were 11.3, 16.2 and 27.3 Mpa, respectively. The results gained in this study prove to be a valuable building materials using RCA for doveloping the RAC. Recycling and reuse of building wastes have been found to be an appropriate solution to the problems of dumping hundred of thousands tons of debris accompanied with shortage of natural aggregates.
Usage of Iron Mine Tailing Sand on Concrete
Authors: Hou Yun Fen , Jia Xin
Published: March 2013

Two iron mine tailing sands and manufactured sands with different fineness modulus are studied and they are mixed into four mixed sands which fineness modulus is 2.6~3.0 by controlling mixing amount of iron mine tailing sand. The influence of mixed sands on workability and strength of C30 and C50 concrete are studied. The result shows that C30 and C50 concrete slump can reach 170mm. Concrete workability is good and strength is qualified too. Fineness modulus is the most important performance index when iron mine tailing sand is used in concrete.
Effect of Fluidity of Cement Mortar and Dispersion of Basalt Fibers on Mechanical Properties of BFRC Composites
Authors: He Wen Min , Chen Shuan Fa , Wang Chuang , Zhang Xue Gang , Xiong Rui
Published: March 2013

Basalt fiber (BF) has a lot of advantageous properties. The actual effectiveness of the fiber depends greatly on their dispersion degree in the composites. With the help of ultrasonic wave and a dispersant carboxymethyl cellulose (CMC), the even dispersion of short basalt fibers in water is realized. The fluidity of the basalt fiber cement mortar becomes less as the fiber content increasing. When the fluidity of mortar of BFRC is greater than 170mm, the even dispersion of short basalt fibers in BFRC can be realized. Fly ash can effectively improve the fluidity of BFRC and the density of cement matrix. When the amount of fly ash replaces the cement less than 25% by weight, it can improve both the compressive strength and tensile strength at age of 28 days.
Study of High-Strength Lateral Ties Stress of High-Strength Confined Concrete
Authors: Shi Qing Xuan , Wang Nan , Wang Peng , Guo Zhi Feng
Published: March 2013

This paper presented a concentric loading test of 10 high-strength concrete columns confined by normal-and high-strength lateral ties. It was confirmed that high-strength transverse reinforcement did not yield at peak strength of confined concrete．On the basis of test date，new equation was proposed to compute the stress in the transverse reinforcement at peak and ultimate strength of confined concrete, which shows good accordance with experimental results. These equations are suitable in the analysis of lateral ties confined concrete.
Research on the Installation Technology of Box-Shaped CFST Column with Super-Large Section and its Application
Authors: Bai Xue , Yao Chuan Qin , Bai Rong , Wang Chao , Ma Hai Bing
Published: March 2013

Based on the project of Kingkey Financial Centre in Guangzhou, this paper conducts in-depth research on the key installation technology of box-shaped CFST columns with super-large section. The technologies including installation, measurement and control, welding, etc, have a good reference and practical extending application value.
The Feasibility Study of GPS Displacement Monitoring in the Slope Geological Disaster Survey
Authors: Qin Dai Lun , Li Jian Feng
Published: March 2013

Withing the people’s research for slope address disaster step by step,the traditional slope monitoring methods have become increasingly unable to adapt to the needs of the slope research.The researchers need a more efficient, reliable, accurate method as an effective measure when dealing with the slope monitoring immediately.In the past ten years the rise of GPS technology with its unique high accuracy, speed, all-weather etc into people's vision, and become a new type of high efficient monitoring method.This paper introduces the GPS technology including application background, principle and think GPS monitoring in slope testing practice is worth popularizing.
3D Laser Scanner and its Application in Engineering Survey
Authors: Feng Yan Ping , Li Wei Guo , Yang Li Bing , Gao Yan Li , Li Wen Bin
Published: March 2013

3D laser scanning system is to use laser ranging principle to record intensively the 3D coordinates, reflectivity and texture information on the surface of the target object. It makes a real record of the three-dimensional space, which makes traditional measurement be released from the limit that couldn’t be exceeded in the past, and let the measurement precision up to a new level. At the same time, it has provided extensive researches with better help than ever. This paper mainly discusses the characteristics, working principle, application and future development of the ground 3 dimensional laser scanner.
Optimum Tilt Angles of Modules on Louvered PV Façade in Changsha, China
Authors: He Shao Yao , Tang Shao Yao , Liu Wen
Published: March 2013

This paper aims to evaluate the optimum tilt angle of PV modules on louvered PV façade in Changsha - a city located at middle and low latitude, and representative cloudy climate conditions in Central China. Within these climate conditions, this research discusses the influences of external and internal factors on photoelectric conversion efficiency and shading effect of louvered PV façade. The research result shows that the external and internal design factors of louvered PV façade take opposite effects on the louver tilt angle. Under the influence of external factors, the preferred value interval will be βopt≈Φ and βopt<Φ, whereas under the influence of the internal design factors, the preferred value interval is Φ and above. Taking all factors into consideration, the optimal tilt angle of the PV louver in Changsha is selected as 30°.
Simulative Study on Solar-Assisted Air Source Heat Pump System
Authors: Wang Qiang , Liu Feng Zhen , Hou Li Jun , Gao Jian Hua
Published: March 2013

A solar assisted air source heat pump unit is designed. The mathematical model of the unit is established and two hybrid operating conditions of the system are simulated. The simulative studying results shows that in winter the solar assisted air source heat pump unit can make full use of solar energy and the coefficient of performance (COP) of air source heat pump can be improved. In summer the cooling heat of air source heat pump could be recovered to improve the stability of solar hot water collector and the COP of the air source heat pump unit is greatly improved. The performance of solar assisted air source heat pump unit is better than that of with no solar assisted air source heat pump.
Thermal Optimization Strategy of External Wall in Low-Rise Light Steel Keel Structure Based on the Theory of Thermal Bridge
Authors: Lu Mei Jun
Published: March 2013

Light steel keel structure is the most mature structure system in low-rise light steel structure residence. Exterior wall skeleton belongs to dense ribbed structure, so its thermal problems of exterior wall are more prominent. From light steel keel structure composition and exterior wall structure, based on the theory of thermal bridge, thermal performance of external wall is analyzed and thermal optimization measures of external wall in low-rise light steel keel structure are put forward. Specific measures are as follows: Firstly, finding the optimum balance point between the structure steel consumption and thermal performance; Secondly, punching in the steel skeleton webs to improve steel column; Thirdly, arranging the non-metal heat blocking between metal components; Finally, choosing external insulation system of outer wall. These measures are not only conducive to eliminate thermal adverse effects, but also can provide valuable theoretical basis for energy consumption analysis of low-rise light steel keel structure residence.
Fusion Study on Architecture Feng-Shui Theory and Ecological Architecture of Edong Ancestral Hall
Authors: Lu Xue Song , Zhen Xin Sheng
Published: March 2013

The development of ecological architectural theory in China and the revival of traditional feng-shui theory have become a huge driving force for the development of eco-building today. In this paper a comparative study of ancestral halls in east Hubei province is made from the perspective of building orientation, topography, building space and building materials and other elements related to both eco-building and feng-shui theory and a conclusion is reached that the essence of feng-shui theory is consistent to the ideology of contemporary ecological architectural theory, which the author hopes will provide some references and a scientific basis for the sustainable development of ecological buildings with Chinese characteristics in China.
The Application of Transparency in Renovation of Historical Building
Authors: Zhu Shan Yao , Zhai Bin Qing
Published: March 2013

After the choice “to be or not to be” of the historical building had been decided, the incoming challenge question is how to make these buildings of old era to be well kept in modern times, which lead to the renovation issue of the historical buildings. The relationship between new and old becomes a new focus in design. This article will state the notion of Transparency, and then try to utilize it as one of the means in design by three aspects: material, function and space. Moreover, the author would analysis the application during the conservation and renovation, and emphasizes the importance of Transparency in harmonizing the new and historical buildings.
The Development of An Ancient Village - Xidi, Wannan
Authors: Zhang Rui Xue , Liu Tian Jie
Published: March 2013

As a typical representative of Huizhou architecture, ancient houses of Anhui Xidi show ancient residential living environment with its integrated primordial form. Excellent artistic attainments is displayed by unique ancient architecture and decorations. This paper introduced residential characteristics, morphological structure and cause of formation of the Ancient villages in southern Anhui, to clarify the influence of architectural morphology to village development.
Discuss the Influence from the Traditional Residential Architecture Culture to the Development of Guanzhong-Tianshui Economic Zone
Authors: Meng Xiang Wu , Liu Ze Hua
Published: March 2013

After three decades of reform and opening up, particularly since the strategy of Western Region Development carried out, the economic and social development of the economic zone has achieved some remarkable achievements and entered a stage of rapid development. With the change of international and domestic economic situation, as well as the country is paying more and more attention to the culture construction, the development of economic zone is facing new historical opportunities and challenges. This article takes the Guanzhong-Tianshui economic zone as the object of study. We try to discuss the the importance of the traditional architecture culture to the development of the economic zone from the perspective of the protection and development of traditional residential architecture culture.
Back Analysis of Parameters and Settlement Prediction of Chengdu Clay Ground Considering Its Creep Behavior
Authors: Feng Yan , Li Jian Fang
Published: March 2013

Chengdu - Mianyang – Leshan (C-M-L for short) high speed railway in Chengdu section is located in the ground of weathered Mud rock overlying deep Chengdu clay area. Based on Chengdu clay ground of in high-speed railway construction project of CML, this article introduced the Burgers model to establish the objective function to analysis rheological constitutive model. The visco-elastic parameters of Burgers model are determined by back analysis of field monitoring data. By the method of iterative back analysis by layer of visco-elastic parameters, based on measured result, predicted the late settlement, and comparison with the follow-up observations records to verify the Burgers model.
Health-Oriented Community Slow Greenway’s Planning and Design
Authors: Lv Fei , Yan Yu Lei
Published: March 2013

Slow greenway as the integration of the natural environment and the living, providing both physiological and psychological health security for urban residents. Although some city-level greenways provide urban public space for residents, it exposed its intimacy is inadequate with residents, walking reach ability is not strong and the use is too concentrated. So that the community slow greenway concept becomes. As the end of the city slow greenway, community slow greenway’s planning and design is significance for the extension and widespread of the urban greenway. Rich the slow greenway’s functions with ecological environmental protection, biodiversity maintenance, entertainment participate, activities support, publicity education and others. Take Chunlei town as an example to explore community slow greenway’s specific planning and design methods, from construction points, feature set, pavement form and public service facilities.
The Methods of French Urban Design and its Inspiration for China
Authors: Hu Shan , Li Jun , Douady Clément Noël
Published: March 2013

Nowadays Chinese cities have many urban design activities. This paper selects three typical cases of the French urban design, from the macro, meso and micro levels of the three space urban design, hoping to give an inspiration for the urban design to the Chinese cities.
An Economic Comparison between Two Types of Heating and Air-Conditioning Systems for Public Buildings in Severely Cold Regions
Authors: Ren Shou Hong , Li De Ying
Published: March 2013

The overall cost of the cooling type air-conditioning plus central heating system is less than that of the all-season air conditioning system in life spans of the two types of systems, which demonstrates the applicability of the principle on design of heating, ventilation and air-conditioning in chapter 5 of Standards of Design for Energy Conservation for Public Building, which suggests that the central heating system should be adopted instead of the air-conditioning system for public buildings in severely cold regions.
Quantitative Study on Eco-Environmental Water Demand of Urban Water System
Authors: Xu Wen Jie , Chen Wei Guo , Zhang Xiao Ping , Gong Hui Ling
Published: March 2013

Eco-environmental water demand of urban water system should be that of certain quality, which is necessary for it to develop its normal functions. The water system includes Dongchang Lake, Tuhai River and Old Canal in Liaocheng City, Shandong Province, China. The multiannual mean optimum, medium and minimum eco-environmental water demand of Dongchang Lake are respectively 2922.9×104m3, 2334.7×104m3 and 1746.4×104m3. Those of Tuhai River are respectively 4757.9×104m3, 2865.7×104m3 and 1919.7×104m3. Those of Old Canal are respectively 348.0×104m3, 277.9×104m3 and 207.9×104m3. Then those of the water system in Liaocheng City are respectively 8028.8×104m3, 5478.3×104m3 and 3874×104m3. These results can provide basis for protecting its eco-environment and promoting its sustainable usage.
The Study on the Green Building’s Values and it’s Crucial Factor - Green Engineering Management
Authors: Lu Mei , Pei Ya Li , Li Fei
Published: March 2013

Nowadays, the green buildings have become an important fashion in construction industry. The green buildings' values for the countries, the investors and the contractors are expounded in this paper.Then green engineering management is the crucial influencing factor for the green buildings. Barriers to the green engineering management, such as cognition, technology, non-integrated codes system and so on also are analyzed in this paper.And in order to promote the development of green engineering management, the correspondingly responsibilities for constructing green buildings are combed and proposed for government administration, guild, research institutes, investors and con- structors.
Research on Suitable Anti-Sliding Piles Spacing Considering of Soil Arch Effect in Colluvial Landslide
Authors: Sun Lin Na , Li Jing , Wang Lei
Published: March 2013

Suitable anti-sliding spacing is one of the most important parameters in the design of anti-sliding piles. It is closely related to whether the soil arch effect can be completely played. Based on analyzing the stress model of soli arch effect on the adjacent soil, the relationship between the piles spacing and the cohesive force c as well as the internal friction angle of the soil behind piles is proposed. The reasonable pile spacing formula which based on the limiting equilibrium equation of state was deduced and verified the method with engineering practice.
Characteristics of Municipal Solid Waste Composting and Determination of Composting Maturation
Authors: Lu Yan Jun
Published: March 2013

The characteristics of thermophilic aerobic composting process for municipal solid waste were studied. The changes of pH and organic matter content, the infrared spectra of organic matter before and after composting, the development of humification, and the toxicity for the seed were investigated. The results indicated that: the pH quickly increased and then decreased, stabilized in the neutral range; organic matter degradation occurred mainly in the first 30 days of high temperature rapid composting stage, indicating the high temperature phase played the main role in the organic matter degradation; the increases of humus, fulvic acid, humic acid and humic acid/fulvic acid ratio also showed the conversion of organic matters to humus. Composting decreased the matters inhibiting seed germination and weakened the toxicity for the plant, and the sample reached maturity through composting.