bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of Environment-Friendly Composite from Waste Paper Fiber and Waste Collagen
Authors: Tan Yin Fei , Liu Bin , Li Peng Fei , Gu Ming Bo , Wang Li Juan
Published: August 2011

Waste newspaper fiber was filled in the collagen cross-linked by glutaraldehyde. The effects of deinking fiber, glycerol dosage, glutaraldehyde dosage on the mechanical properties of composite were investigated. It is found that the deinking treatment increases the strength of the composite material. The composite has better mechanical properties under the preparing conditions as follows: waste newspaper fiber content 10%, glutaraldehyde dosage12.5%, glycerol dosage 12.5%, pH 9.7, 60°C for 2h. The tensile strength and elastic modulus are 4.98Mpa and 0.09Gpa, respectively.
Adsorption of Nickel Metal Ion from Simulated Aqueous Solution Using Flavobacterium sp. Biomass: a Kinetic and Thermodynamic Study
Authors: Wang Yuan Hong , Yu Yun , Liu Rui Qun , Liu Wei Feng
Published: August 2011

Present study deals with the evaluation of biosorptive removal of nickel byFlavobacterium sp.Experiments have been carried out to find the effect of various parameters such as initial pH, contact time and initial metal ion concentration. Adsorption equilibrium studies showed that Ni(II) adsorption data followed the Langmuir model, the maximum binding capacity of Ni(II) was 64.20 mg/g at pH 7.0. Kinetics of nickel biosorption by Flavobacterium sp.biomass is better described by pseudo second order kinetic model. The equilibrium isotherm data are very well represented by Langmuir isotherm equation, which confirmed the monolayer coverage of nickel onto Flavobacterium sp.biomass. It was also clearly observed that The present study indicated thatFlavobacterium sp.biomass may be used as an inexpensive and effective biosorbent for the removal of Ni(II) ions from environmental wastewater.
Computer-Aided Design for the Stress Distribution of the T Plate
Authors: Li Wen Yuan , Ming Cheng Lin , Kou Zhi Yong
Published: August 2011

The simulation for the situation of inverted T composite slab of precast fabricated construction is done, to analyze the stress distribution in the T composite slab of precast fabricated construction, shows that, the maximum deflection exhibits in the middle of plate. Due to the grouting of the concrete, the T plate and the concrete take effect simultaneously, to make the moment of inertia increase greatly, lower the deformation of the composite plate, and increase the resistance capacity. The T plate is pre-stressed, the stress in the x direction of steel bar will increase to the maximum value with the time pass. The result will give some guidance for the real practice.
Fuzzy Comprehensive Evaluation of Oil Spills Pollution Level for Offshore Platform
Authors: Lang Yin Hai , Cheng Fang Fang , Wang Nan Nan
Published: August 2011

Oil pollution is considered as one of the pollutants that are harmful to the marine environment. An approach based on both analytic hierarchy process (AHP) and second order fuzzy comprehensive evaluation (FCE) is firstly presented to evaluate oil spill pollution level for offshore platform. The results show that the proposed assessment method is accurate for oil spills, and the model provides a certain technical support for the emergency decision-making department to take the emergency measure.
A BIPV Case Study of the Environmental Effects with the PV Energy Performance
Authors: Chen Hsuan Jui , Chiang Che Ming , Chan Chi Chang , Huang Chao Yang
Published: August 2011

The operation of BIPV case study aimed to the environmental effects of the architectural design on landscape, which estimated the usability between human behavior and renewable energy on the design management. The BIPV project was the landmark of the local city hall, when it was built in Tainan Country in 2005, and it was the first BIPV research model in Taiwan. The multifunction covered three aspects: renewable energy usage, green site planning and underground parking lot. The BIPV working system was a hybrid system, which used 219 pieces PV modules by glass-to-glass type, and had total PV capacity of 24.09kWp. In the PV renewable energy, the DMY data was from 1.42 to 1.82 (kWh/day/kWp) and the PR value was form 36.6%-49.2%. For consideration of each evaluated factors, the architectural esthetics and energy design of the BIPV research case was not perfectly balance in the project. The citizens could accept this modern urban park as a friendly design for usage. But the PV power efficiency, the excessive design and inexact distribution decreased its power performance too much. Ultimately, the research presented an intensely interesting data for Taiwan BIPV development between the PV industry and architectural design.
Effect of SO2 on PPS by a New Durability Testing Method for Filter Media
Authors: Mao Ning , Liu Jing Xian , Sun Xi
Published: August 2011

The durability research on the filter media is of great significance. It is necessary to establish a laboratory test method on it in practical use. A new testing method is provided for filter media durability under corrosive gas condition in the paper. PPS is selected as standard testing sample and it is tested in SO2 gas. Under 1000ppm SO2 and 200°C condition, both warp strength and weft strength of PPS increase at the beginning and then gradually decrease with duration. And the decrease of weft elongation is obviously higher than warp elongation for PPS.
Split Rigidity Method for Analysis of Two-Way Orthogonal-Diagonal Double-Layer Space Grids Structure
Authors: Liu Wen Yang , Zhang Wen Fu
Published: August 2011

In this paper two-way orthogonal-diagonal double-layer space grids structure is assumed as equivalent sandwich plate, and has been analyzed by the non-traditional theory of plate with three generalized displacements, in which shearing deformation is considered. Based upon the split rigidity method, static analysis and natural vibration analysis of two-way orthogonal-diagonal double-layer space grids structure has been studied and the simplified formulas are given out. The comparison with the results of equivalent sandwich plate method shows that as a more simplified method, split rigidity method is as accurate as equivalent sandwich plate method.
Spatial Analysis of Nitrogen and Phosphorus Loads from Non-Point Source in the Three Gorges Reservoir Area of Hubei
Authors: Ma Xiao , Li Ye , Du Shuang , Zheng Fang Zhao
Published: August 2011

Recently, increasing nutrient (i.e., nitrogen and phosphorus) concentrations have been observed in the surface water of many countries and the non-point source (NPS) pollution has become an important factor in the deterioration of water quality in the Three Gorges Reservoir Area (TGRA). The spatial and temporal analysis of NPS pollution loads in the TGRA of Hubei from 2005 to 2009 were estimated using export coefﬁcient model in this paper. The results indicated the nutrient from rainfall was the dominant NPS of both TN and TP pollution. The spatial analysis of N and P loads from NPS in the TGRA of Hubei showed that the nutrient loads in BD County and YL District were higher than the other two counties in the study area. These findings demonstrate that the model could provide a simple and reliable approach to evaluate N and P loads to TGRA of Hubei and may be useful for planning and management of the local agricultural watersheds
The Finite Element Analysis of Coupling Law of Single Phase Stress Field / Seepage Field in Permeable Stratum Medium
Authors: Mei Yu Fen
Published: August 2011

The research of reservoir fluid-solid coupling theory is hot issues in home or foreign recently, In oil, civil, environment and geology, mining and other fields with a wide application. On the basis of summarizing the predecessors' achievements，according to the basic theory of rock mechanics, fluid mechanics in porous medium, geologic mechanics, calculated mechanics and fluid-solid coupling seepage, a mathematical and numerical model of seepage field and stress field coupling is developed in porous medium and the LiuNan blocks of JiDong oilfield wells.based area single phase Stress Field / Seepage Field in solving with the method of finite element software ANSYS, Contrast analysis of LiuNan blocks Coupling around of Field / Seepage Field is the change of average stress and total displacement. As can be seen from Table 3, after coupling the value of average stress and total displacement are greater than before coupling.The results show than it is important meaning for used to solve practical engineering problems.
Reliability Analysis of Reinforced Concrete Structural during Construction
Authors: Zhao Jun
Published: August 2011

According to random field theory, combined with the construction of the characteristics of reinforced concrete structures, based on the geometric significance of the reliability index, the optimization algorithm of the reliability was established, and the reliability calculation algorithm of reinforced concrete structural during construction is proposed based on stochastic finite element method. Based on a stochastic analysis of the practical engineering, the time-varying laws of the reinforced concrete structural reliability index during construction are concluded.
The Effect on The Overall Performance of Frame Structure of Local Column Destruction
Authors: Sun Yue Dong , Lin Yu Ming
Published: August 2011

How to ensure the whole stability of structure and avoid progressive collapse of structure caused by destruction of local structures under accidental loading have been paid close attention to extensively by researchers all over the world. According to GSA guidelines, FEM model of 3-D frame structure was established by ANSYS software. Failure of frame structure local column is simulated with the method of "killing" columns of long side, short side, corner side, and interior side, and two columns of long sides, in order to explore the regularity for change of series performance parameters when the frame structure suffering accidental loading. And the alternative load path method was used to analyse the collapse of reinforced concrete frame structure. The result indicates that the frame structure local column damage can make structure basic natural vibration period and maximum interlayer displacement angle larger, and make minimum ratio between shearing force and weight smaller, and if two columns of long side are destroyed, the progressive collapse of frame structure will occur.
The Environment Influences Evaluation on SCR Flue-Gas
Authors: Hao Li Fen , Xing De Shan , Cao Rong Liang
Published: August 2011

The present study analyses the three processes of SCR flue-gas denitration project by LCA, such as the production and transportation of the liquid ammonia and the catalyst flue-gas denitration, which based on a SCR flue-gas denitration engineering project in a power plant.The energy consumption and environmental impact of each process are collected and calculated respectively. The results show that SCR flue-gas denitration project has obvious improvement function to the atmosphere environment.
Performances of Modified Urea-Formaldehyde Resins for Bonding Plywood
Authors: Zhang Ji Zhi , Liu Xiao Ying , Qiu Ying Ying , Wang Xiao Mei , Li Jian Zhang , Zhang Shi Feng
Published: August 2011

Urea-formaldehyde resin was modified by a modifier with different synthetic processes labelled as UFM1, UFM2, and UFM3 respectively. As a comparison, normal UF resin with a F/U molar ratio of 1.1 labelled as UF0 was synthesized. The thermal behavior of modified urea-formaldehyde resins was studied by TG-DTA techniques, and the properties of plywood bonded with the UFM resins were investigated. The conclusions were as follows: (1) the modifier used in this study could significantly reduce the free formaldehyde content of urea-formaldehyde resin and the formaldehyde emission of plywood; (2) The exothermic peak temperatures of DTA curve were 129.37, 125.05, 120.98, and 116.11 °C for UF0, UFM1, UFM2, and UFM3 respectively. (3) The plywood manufactured with UFM2 and UFM3 resins have high bonding strength (1.28MPa and 1.59MPa) and low formaldehyde emission value (E1 grade).
Start-up Experiment of Ethanol-Type Fermentation of Pretreated Surplus Sludge
Authors: Li Guang , Wang He Li , Qi Hui Long , Bai Yang
Published: August 2011

This paper study on surplus sludge of high pressure combined with thermal hydrolysis; investigate the start-up of ethanol-type fermentation. The results show that under the condition of HRT 3.6 d, the organic loading rate for 4.40kgVS/m3•d, the pH of acidogenic phase should be controlled in the scale of 4.0～4.5, the acidogenic phase could stable at the ethanol-type fermentation stage after the experiment lasting for 22d, the contractions of outlet sludge in VFA reached 3820～3980mg/L, in which the sum of ethanol and acetic could reach more than 72% VFA, the specific hydrogen production of acidogenic phase in this condition achieved 0.018 L•H2/g•VS.
Impact of Double-O-Tube Shield Tunnel Construction on Grillage Beams Foundation Frame Building
Authors: Wei Xin Jiang , Hong Jie , Wei Gang
Published: August 2011

Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-O-Tube (DOT) shield tunnel was simulated by 3D MIDAS/ GTS software, and the impact of construction on the building was analyzed. The results show that: the ground settlement trough caused by DOT shield tunnel can be fitted by peck formula; during the passage of the shield tunneling through the building, the settlement of the building increased and settlement trough was wilder; the settlement was stable and had a little rebound when shield machine already passed the building; with the increase of driving distance, the first principal stress P1 increased and then was stable; with the increase of L, the shape of foundation settlement curve changed, and the maximum differential settlement between columns increased but was small.
Study on Mercury Methylation in Sediment Using Enriched Stable Isotope Tracer
Authors: Mao Yu Xiang , Wang Hai Lin , Wang Mei
Published: August 2011

Methylmercury (MeHg) production from inorganic mercury in natural environment leads to bioaccumulation in fish, putting human being under the risk of exposure. This study investigated the transformation of enriched stable isotope tracer,199Hg2+, in sediment slurry of the Florida Everglades. Incubation experiments were conducted under four different laboratory conditions. The results suggest that methylation of mercury mainly happened under anaerobic condition, with microbial activity playing the major role. The relative methylation rate was determined to be 1% per day at the first few days, and then this transformation process slowed down. At the end of incubation experiment, totally around 20% of the isotope tracer199Hg2+was transformed to its methylated form, Me199Hg. This high potential of mercury methylation partially accounts for the contamination and bioaccumulation of MeHg in the relatively pristine Florida Everglades ecosystem.
Comment on an Enhanced RSA-Based Partially Blind Signature
Authors: Liu Cheng Lian , Zhan Jin Song , Zhang Jian Hong
Published: August 2011

Hwang et al. showed that the Chien et al.'s partially blind signature scheme based on RSA public cryptosystem could not meet the untraceability property of a blind signature. Wen et al. and Wu et al. claimed that Hwang et al.'s attack is incorrect. Later, Fang et al. gave an improvement to against Hwang et al.'s method. In this paper, we pointed out some typographical errors in Wen et al. and Wu et al.'s article; and certained their claims are correction. Thus, the Fang et al. improved scheme may not becomes to be necessary. Chien et al.'s partially blind signature scheme is still satisfy the untraceability property.
Evolution Features and Controlling Factors of Depositional Systems of Paleogene-Neogene in Maxian Area, the Northern Margin of Qaidam Basin
Authors: Zhang Rui , Ji You Liang
Published: August 2011

According to the comprehensive detailed analysis of data such as, drilling core, logging and outcrop section, four kinds of sedimentary facies, namely, proluvial fan, braided river, shallow water braided river delta, and oxidative lacustrine, are recognized in Paleogene-Neogene of Maxian area in the northern margin of Qaidam basin. The evolution features of the sedimentary systems were analyzed in details: at the early forming stage of the lake basin (Paleocene-Eocene), proluvial fan -braided river depositional systems were developed in the study area. At the middle flourishing stage of the lake basin (Oligocene-Middle Pliocene), the main sedimentary systems were braided river-shallow braided river delta-oxidative lacustrine. Then the study area was dominated by proluvial fan-braided river-oxidative lacustrine depositional systems in the regression stage of the lake basin (Late Pliocene). The range of the depositional systems in low frequency sedimentary cycle was controlled by the multi-cycle tectonic uplifts and squeezing action of mountains around the study area. Paleoclimate and ancient landform controlled the high frequency change of the lacustrine level and supplied an advantage for the development of shallow braided river delta and oxidative lacustrine facies.
The Study of Calculation Methods for Foundation Sedimentation
Authors: He Wei , He Rong , Hu Feng
Published: August 2011

The soil under foundation of building deformed by the top load of which the value depended on not only the size and distribution of building loads, but also the type, distribution, and compression character of foundation soil. If the excessive pressure overloaded the foundation bearing capacity, the foundation would loss stability and breakage. Uneven foundation sedimentation will make the upper building crack. Therefore, the calculation method for foundation sedimentation is very important to guarantee the safety of buildings. In this paper, the calculation theories and methods for foundation sedimentation were compared and the relative preventive measures of disaster were illustrated.
The Frame of Informational Reform in the Supervision System of Power Operation - The District-Level Power Supervising Organs of Chinese Cities for Example
Authors: Wu Jian Feng
Published: August 2011

The deficiency and vacancy of supervision during the operation of the Power, are always directly related to bull supervision and management which sometimes lead to multiple standards. Because people who manipulate power have different educational background, ideology and even faith, the abuse of power becomes liable. The existent power operation system entails not only the high operation cost and low efficiency but also the sanction shortage of supervision system and mechanism. Therefore, when we are attempting to achieve the reduction of operation costs and improve the efficiency of the supervision, we should first solve the deficiency and vacancy of supervision within the existent system, break the " versatile power operation system" concept, reform the mode of power allocation, and build a new integral supervision and management system in the power operation. In addition, we should also make use of modern electronic information surveillance platform, associate the anti-corruption control system with information, technology and accountability mechanism, in order to reduce the possibility of corruption on the level of heteronomy, and promote the scientific ,reasonable and effective anti-corruption. Corruption is a tumor of society. It reduces the credibility of the power sector and affect the political environment of society. Especially grassroots power departments and functional departments, accompanied by the absence of people's faith and the regradation of morality, present the multiple and diverse forms of corruption, this situation highlights importance of the reform toward the corruption of supervision. It is an urgent need of both the social development and the institutional reform to build a scientific and rational power supervision system and to realize the scientific anti-corruption. As the party and our country are developing, the construction of anti-corruption is now facing many new conflicts and problems that the organs and sections are arbitrarily internalizing the "insiders" and not following the rules to deal with problems and that the nonfeasance of supervising department still cannot be eluded. Nowadays we can clearly see that the anti-corruption work is continuously proceeding with achievements; On the other hand, as the corruption is effectively under control, there are many new features and problems coming out; corruption is in a new guise, and switching techniques, the hidden corrupt network is still functioning throughout the anti-corruption, the situation is still severe, and the task is also still arduous.
The Method for Estimating the Amount of Catalyst of Artificial Hail Suppression by Rocket
Authors: Ye Guang Ying , Feng Hong Fang , Chen Qiu Ping , Yu Cheng Biao
Published: August 2011

based on the theory of “food capture”, adopted BL-1 rainfall rocket with various resources, choose three typical cases to estimate catalyst dosage. Describe the practical bomb number might much more than theory. Different scale and development means different lunched bomb. At the same time, save bomb cost under the circumstance of hail suppression.
Energy Consumption Analysis of Energy Saving Retrofit of Building Envelop of New Country
Authors: Liu Guang Jun , Zhu Hong Mei
Published: August 2011

There were some problems in the building envelop of Huangmuchang village of Zhangjiawan town of Tongzhou zone Beijing city, as a demonstration village of energy saving retrofit in construction of new countryside. The problems include big heat-transfer coefficient, great cold air infiltration capacity, heat drawback, cold bridge and heat bridge etc. In this paper, how to decrease unit area heat load and improve thermal comfort by building envelop retrofit was introduced. The obvious improvements were obtained by comparing the interior temperature of the retrofitted building with that of un-retrofit building.
The Study of FEM for Internal Force Analysis of the Sluice Structure
Authors: Li Xiao Na , Li Tong Chun , Ding Yuan
Published: August 2011

This paper takes a sluice reconstruction project as an example. The constraint internal force, the related axis force, bending moment, and shearing force at the corresponding section are solved according to the unit stress and internal force balance. Furthermore, technology of mesh auto-generation in cross-section is utilized to plot the internal force graph of the structure directly, which will provide reference for reinforcement design and make it more convenient.
Comparative Study on Mechanics of Galvanized Steel Wire Mesh and GFRP Reinforced Wood for Timberwork on Chinese Plantation
Authors: Zhou Xian Yan , Wang Qian , Li Jing Hao , Zhang Zhong Feng
Published: August 2011

In order to select the optimal reinforcing material to reinforce structural lumber for timberwork, the properties and mechanics of experimental samples made by galvanized steel wire mesh and GFRP reinforced wood from Chinese plantation were analyzed. The experiment results showed that two kinds of reinforcing materials could reinforce lumber, and galvanized steel wire mesh had better mechanics than fiberglass mesh. Furthermore, the glued structural lumber had enough bonding strength which was fit to make structural composite lumber for timber bridge.
Design of Reformation on the Frame Adding Layer
Authors: Zhang Chun Mei , Zhao Gen Tian , Zhi Guan Peng
Published: August 2011

The program of selecting the reasonable scheme of the adding frame work for the earthquake district is introduced. Different ways are compared in accordance with the practical project examples. The employment of an adequate scheme can ameliorate the building design of jacket frame in seismic regions.
Energy Saving Research in Building Life Cycle
Authors: Jia Hong Jun , Chen Yun
Published: August 2011

The building energy consumption is one of the biggest components of energy consumption in China. Based on the building life cycle energy consumption theory, this paper proposed a modified model, which extra considered the influence of building planning, design and building materials’ recycle to energy consumption. This paper analyzed every building stage’s energy consumption and provided saving measures. According to the present situation of China, this paper explored new ideas on building energy saving.
Experimental Study on Mechanical Properties of Recycled Concrete Specimens of Marine Engineering
Authors: Liu Wen Bai , Li Xia
Published: August 2011

Mechanical properties of recycled concrete under different conditions were studied in this paper. Based on three kinds of replacement percentage of recycled aggregate and four kinds of seawater corrosion conditions, the experimental study of mechanical properties of recycled concrete specimens corroded by seawater and produced under vacuum conditions were conducted, and compared with that of ordinary concrete specimens. Testing results show that compressive strength of recycled concrete decreases with the increase of both the replacement rate of recycled aggregate and the corrosion time by seawater, with the maximum reduce value is 17.96% and 24.52%; Vacuum conditions effectively improve the strength of recycled concrete, improved value is 1.03-1.19 times of the same replacement ratio of recycled aggregate, and 1.00-1.16 times of the ordinary concrete. It provides the reference for marine engineering application of recycled concrete.
Comprehensive Evaluation Method for Interchange Project Based on Projection Pursuit
Authors: Li Hai Tao , Qiao Cheng
Published: August 2011

Comprehensive evaluation method for interchange project is built on the basic principle and the solution process of the projection pursuit algorithm. The method can determine directly the objective weights of the indexes from the project of being evaluated, and avoid the subjective negative impact on the conclusion of the determining index weights and the conclusion influenced by the index weights given by people themselves in other evaluation methods. Real coding based Accelerating Genetic Algorithm (RAGA) is proposed and applied to deal with global optimization problem of high-dimensional data effectively by optimizing the projection index function and searching for the optimal projection directional vector.
Study on Prevention and Control Technique of Ground Pressure in Fully Mechanized Mining Remained Coal Pillars
Authors: Xia Hong Chun , Song Zhen Qi , Li Wei
Published: August 2011

Based on the strong danger and great difficulty characteristics of coal pillars mining under strong ground pressure in Datong coal district, the observations on the No.311 coal face in Tongjialiang coal mine were carried out by the method of drilling bits. The key zone of ground pressure prone was determined and the effective unloading measures by blasting were also taken to mining coal pillars by fully mechanized mining technique.
Study on Transport Rules and Fully Mechanized Mining with Top Coal Caving Technology of Coal Seam with Huge Thickness in Tashan Mine
Authors: Yu Bin , Zhao Jun
Published: August 2011

For the conditions of coal seam with huge thickness, structural complexity and intrusion by pyrolith in Datong carboniferous period, using laboratory similar simulation, on-site deep basis points observation and working face coal caving measurement, it is found out the migration and release laws of top coal, developed a practical caving technology. It has a good economic efficiency, and it is great significance for similar mining area to mining coal seam with huge thickness.
Investigation on Key Technology of Virtual Assembly and Construction for Tunnel Boring Machine
Authors: Cheng Jun , Gong Ya Dong , Liu Yue Ming
Published: August 2011

This study presents a practical requirement and realizes one new virtual construction interactive system for tunnel boring machine. One type of TBM(tunnel boring machine)’s virtual prototype has been built. Software PROE is used to build the shield machine model. Application program of virtual assembly system base on virtual reality is developed by using Division, The author also study on key technologies of constructing virtual assembly system of shield machine, such as interference detection in virtual environment. Application program of virtual simulation system base on virtual reality is developed by using C++. The result shows that the work station can be simulated well, and this virtual simulation system can be extended in virtual training and manipulation, virtual construction and so on.
An Experimental Study on Engineering Properties of Rubber Particles-Improved Fly Ash Soil
Authors: Li Chang Yu , Liu Han Bing , Wei Hai Bin
Published: August 2011

In this paper, by studying the engineering properties of rubber particles-improved fly ash soil, the authors provide technical parameters for setting up cold-resistance layer in the seasonal frozen zone. In the experiment, rubber particles are mixed into the fly ash soil by mass of 0%, 1%, 2%, 3%, 5% and 7% and unconfined compressive strength testing, frost heave test, insulation test and thermal conductivity test. By analyzing the test results, the authors drew the conclusion that fly ash soil improved by rubber particles has a high compressive strength, a small amount of frost heave, good insulation performance, small thermal conductivity coefficient.Therefore, improved fly ash soil with rubber particles is one of the preferred materials to set up the cold resistance layer in seasonal frost zone.
The Nonlinear Analysis of the Biopresthetic Heart Valve
Authors: Ma Hai Bo , Yuan Quan , Zhu Yan Qiu , Ye Xin
Published: August 2011

In order to improve long-term durability of bioprosthetic heart valve, we take the spherical,paraboloidal,cylindrical and the ellipsoidal leaflets for nonlinear analysis and the material is orthotropic.The experimental results of the finite element nonlinear analysis show that when the leaflets with the material orthotropic is closed,the deformation of the symmetric edge is larger than else. The stress distribution of the cylindrical, spherical, paraboloidal and ellipsoidal valve leaflets is quite different. The ellipsoidal valve leaflets have more advantages than the cylindrical, spherical, paraboloidal valve leaflets.This work is very helpful to manufacture reasonable shaped valvular leaflets and to prolong the lifetime of the bioprosthetic heart valve.
Finite Element Analysis of Universal-Rod Steel-Shuttering Jumbo for Tunnel Lining
Authors: Peng Wei Ping , Huang Yan Ting , Wang Dao Ming
Published: August 2011

Universal-rod steel-shuttering jumbo (URSSJ), as a key construction equipment for tailrace tunnel lining of underground plant in Pubugou hydropower station, has a good reusability in structure but must satisfy the requirements of intensity, rigidity and supporting stability. Due to complicated working conditions of the URSSJ, it is difficult to calculate stress and strain of the URSSJ based on traditional design method. In this paper, finite element technology is introduced into the analysis of the URSSJ. The approach of this work includes steps of (1) analyzing the structure, working conditions and load characteristics of the URSSJ, (2) modeling the hinge system by meshing, loading and boundary constraints, and (3) computing stress and strain of its major components under the most dangerous condition. The results verify design feasibility and structural reliability of the URSSJ.
Less Loss of Fluidity of Polycarboxylic Acid Type Water Reducer
Authors: Zhong Xun
Published: August 2011

Cement paste and concrete with different molecular weight of side-chain of polycarboxylic acid type water reducer (PC) and retarder has been researched. In this way, the method of adjusting the molecular weight of side-chain and complexing retarder to hold fluidity has been discussed. The results show that with increase molecular weight of side-chain, the dispersibility and holding dispersibility increases. With retarder and PC, the dispersibility and holding dispersibility of PC with big more molecular weight of side-chain increases and the loss of fluidity at 1h prominence reduces. But it relates to breed of cement. Especially at low ratio of water and cement, when molecular weight of side-chain is more than 2000, complexing PC and retarder can improve the fluidity and holding fluidity.
Study on the Influence Factors of m Value Based on PLAXIS Nonlinear Finite Element Analysis
Authors: Gui Jin Song , Li Zhen Guo , Chen Guo Qiang , Meng Qing , Zhang Bo
Published: August 2011

In this paper, a geotechnical finite element software PLAXIS is used for the nonlinear finite element analysis of elastic long pile under the horizontal force action. By using the calculated maximum bending moment and the maximum displacement at the ground, and combined with the related formula for “m” method given in《 Code for Pile Foundation of Harbour Engineering》, a more accurate m value can be obtained conveniently. Based on this method and by the single factor analysis, a more systematic study was made to the related factors,and obtained the influence law of various factors to m value.
Axial Compression Properties of Recycled-Concrete-Segment/Lump Filled Steel Tubular Columns with Inner CFRP Tendons
Authors: Zhu Qian , Zhao Jun Hai , Wei Xue Ying , Wang Juan , Wang Su
Published: August 2011

Recycling of waste concrete is beneficial and necessary from the viewpoint of environmental preservation and effective utilization of resources. The carbon fiber reinforced polymer tendon (CFRP tendon) has been widely used in concrete structures due to its high-strength, lightweight, good erosion-resistance, diamagnetism and anti-fatigue. The compressive behavior of recycled-concrete-segment/lump filled steel tubular columns with inner CFRP tendons are investigated in this paper. The formula of ultimate capacities of the columns under axial compression has been derived based on unified strength theory. Good agreement can be found from the comparison of the analytical results obtained in this paper and experimental data. Parametric studies are carried out to evaluate the effects of intermediate principal stress, mixture ratio of the recycled concrete and reinforcement ratio on the bearing capacities of the columns.
CAD Model Reconstruction Using 3D Laser Scanning
Authors: Zhang Dong , Huang Teng , Song Jing Cao
Published: August 2011

This paper presents a method for automatic CAD model reconstruction from 3D laser scanning data. 3D laser scanning is a surveying instrument integrated with various kinds of new high technologies, which operates by non-contact high speed laser measurement. The whole process includes data capturing, noise reduction, sub-sampling and surface reconstruction. Modeling accuracy is analyzed afterwards and finally comes to a conclusion that modeling from 3D laser scanning has a great value in virtual reproduction of the objects. Result shows the efficiency of the method addressed in the paper to mode objects.
Removal of Heavy Metal Ions from Water Using Nano-Barium Strontium Titanate Immobilized on the Silica Gel G as an Adsorbent
Authors: Zhang Dong
Published: August 2011

A new method based on the sorption of the nano-barium strontium titanate immobilized on the silica gel G(GBST) to heavy metal ions, included Mn(Ⅱ), Cu2+, Ni2+,Co2+and Ag+, in waste water. The effects of process parameters such as pH, contact time, regeneration conditions and the effects of common coexisting ions on the ions uptake were investigated. The results showed that the manganese, copper, nickel, cobalt and silver ions studied could be quantitatively retained at a pH value range of 7~9. The adsorption capacities of GBST for manganese, copper, nickel, cobalt and silver ions were found to be 8.2 mg/g, 18.3 mg/g, 4.2 mg/g, 2.2 mg/g and 3.1 mg/g, respectively. The heavy metal ions adsorbed on the sorbent could be eluated completely with diluted HNO3solutions. The GBST can be used as an effective adsorbent for the treatment of wastewaters contaminated with manganese, copper, nickel, cobalt and silver ions.
Adsorption and Preconcentration Capabilities of Nano-Barium-Strontium Titanate Powder Coated by Dithizone for Trace Bismuth
Authors: Zhang Dong
Published: August 2011

A new method for the adsorption and preconcentration of bismuth in urine was described. The methodology combines determined using a hydride generation-atomic absorption spectrometry (HG-AAS) with pre-concentration and separation of the bismuth on the nano-barium-strontium titanate powder coated by dithizone (BST-dithizone). The experimental conditions for the pre-concentration and separation of the bismuth, including pH value of the medium, shaking time, eluent condition and co-existing ions have been investigated. The result showed that the bismuth in urine could be adsorbed on the BST-dithizone. The adsorption percentage was affected by the pH value of medium and shaking time. In the medium of pH 6.0, the adsorption capacity of BST-dithizone to bismuth (III) was 13.4 mg·g-1 when the shaking time was 10 min. The bismuth adsorbed on the BST-dithizone could be completely eluated by 2 mol·L-1 HNO3. The enrichment factor was 100. The detection limit of bismuth (III) was 5.1 ng·L−1.The method has been applied to the pre-concentration and separation of bismuth in the human urine and tap water with satisfied results.
Indoor Thermal Comfort and its Effect on Building Energy Consumption
Authors: Yang Xue Bin , Sun De Fa , Zhou Xiang Jiang , Cai Ling Ling , Ji Ying
Published: August 2011

The indoor thermal comfort and its effect on building energy consumption have been conducted by literature reviewing in the study. The linear relationship and the related formulations of various thermal comfort indictors are summarized to evaluate the human comfort. These parameters include predicted mean vote, thermal sensation vote, adaptive predicted mean vote, thermal comfort vote, and thermal acceptability. Under different climatic or regional conditions, both relationships between thermal comfort parameters and indoor or outdoor air temperature, and between comfort vote and another comfort parameter, are summarized for their definition and formulation. The comfort parameters such as local air speed, neutral temperature, PMV set point and others will directly impact the building energy usage. It is of significance to seek an optimal alternative for energy savings.
Literature Surveys on Benchmarking and Rating of Buildings
Authors: Yang Xue Bin , Sun De Fa , Zhou Xiang Jiang , Yang Ji Chun
Published: August 2011

This study reviews some published literatures on the benchmarking and ranking guidelines, tools and comparison of buildings. Energy performance, Indoor air quality and thermal comfort can be covered for the rating tools for buildings. Further, the energy performance can also be calculated by the other parameters related to the room thermal properties. A rating system to benchmark buildings can employ several parameters including indoor environment quality, clothing volume, predicted mean vote, operative temperature, and thermal energy consumption. It can be concluded that the indoor air quality or thermal comfort can be used to evaluate buildings due to their influence on the occupant satisfaction and job performance. Also, building benchmarking or rating will be various because Different comfort criteria may lead to different comfort temperature.
Energy Saving Measures of Building Integration and Cost Analysis Based on 65% Standard
Authors: Yang Jian Hui , Wang Yu , Xiong Zheng Zhuan
Published: August 2011

It is difficult to reach the request that 65% standard of building energy in china and the goal of China’s science and technology development in 2020 using traditional outer insulation technology. The several combinations of ordinary concrete (1) and bearing ceramsite concrete (2), styrofoam board of external thermal insulation for external wall (3) and cement-based glazed hollow bead insulation system (4) are made thermal calculations and cost analysis separately in this paper based on a practical project of Jiaozuo city. The results indicate that the combination of (2)+(4) is the best one, which reduces the energy saving rate, labor intensity, transportation weight, project cost by 74%, 20%, 30%-40% and 10% respectively.
Study on the Multi-Axis Motion System Based on EtherCAT
Authors: Jia Jie , Zhang Gen Hua , Lai Jian Yong , Ling Huan
Published: August 2011

To obtain a faster response speed and higher synchronization accuracy, the paper firstly discusses the difficulties and disadvantages of organizing servo motion network with traditional fieldbus. Then, a novel method for constructing multi-axis motion system based on EtherCAT is presented. With DSP and an improved PID control algorithm, the hardware and software design is introduced in details. The system has realized high-speed remote data transmission and high-precision velocity control for Multi-axis which the traditional fieldbus can’t achieve.
Mechanical and Thermal Properties of PCM Wallboards Based on Gypsum and Paraffin
Authors: Wang Xiao Peng , Shen Zhen Qiu , Zhang Yi , Li Dong Xu
Published: August 2011

This paper studied on preparation, mechanical and thermal properties of two PCM wallboards made of gypsum and paraffin composite, PCM particles wallboard and PCM bag packed wallboard. Density, flexural and compressive strength and thermal conductivity of PCM particles wallboards deceased as PCM particles dosage increasing. Only PCM particles wallboard with PCM particles dosage 30% is suitable. Thermal comparison between PCM wallboards and pure gypsum wallboard shows that two PCM wallboards have better thermal properties and PCM wallboards can be used in building envelope to cut down building energy-consumption.
Research on Sulfate Attack Resistance of Concrete with Sulfate Corrosion-Resistance Admixture
Authors: Yang Ben Ju , Li Qiu Yi , Gao Song , Li Tao
Published: August 2011

A concrete sulfate corrosion-resistance admixture is developed with anhydrous calcium sulfo aluminate (C-S-A), super fine slag powder (P800) and anhydrite (CaSO4) in this paper. Scope of prescription is optimized according to performance requirements of JC/T1011-2006. This sulfate corrosion-resistance admixture has declared Chinese national invention patent (201010256189.2)[1]. Corrosion resistance coefficient is tested after sulfate corrosion-resistance admixture is adjoined into fly ash concrete. The results reveal that sulfate resistance of the concrete is obviously improved by addition of sulfate corrosion-resistance admixture, and the its anti sulfate erosion grade is KS150.
Numerical Simulation for Destroy Pattern of Surrounding Rock of Circle Tunnel with M-H Coupling Action
Authors: Jiang An Nan , Li Peng
Published: August 2011

The uniform zonal disintegration of surrounding rock is the peculiar phenomena of deep and high stress field, researching the inner mechanism and affecting factors has important meaning for guaranteeing the safety of deep engineering. The paper adopted strain soft Mohr-Coulomb model and carried out numerical simulation of surrounding rock fracture and excavation. The simulation states that along with the unloading time accumulation, the shear belt produced from tunnel wall and developed to inner rock. The corresponding shear stress concentration zone also spread to inner rock and destroy zone increasing. The pore water pressure increasing will accelerate the shear belt developing and increase the destroy degree.
Numerical Simulation for Large Section Tunnel Based on Stress Mapping Return Arithmetic and Loading Releasing Method
Authors: Song Zhan Ping , Jiang An Nan
Published: August 2011

Aiming at that general Finite Element Method is difficult to simulate the complex tunnel excavation inducing the second stresses adjusting, the paper proposed the simulation methods combining loading releasing and stress mapping return arithmetic. After the introduction of relative theory, the FEM code has been developed by VC++ . The excavation process of a large section tunnel engineering CRD construction is simulated by the code, the displacements contour, arc top and arc shoulder settlement, horizontal convergence and ground face settlement corresponding to each excavate step have been obtained by the simulation. The regulation of the results are compared with monitoring data, which stated the method is feasible. The simulation has guiding meaning to the tunnel engineering construction.
Ecological Construction Experience Analysis on Traditional Houses of Dong Inhabit Villages in Sanjiang, Guangxi
Authors: Chen Qun , Ye Yan Bing
Published: August 2011

Constructions in Dong inhabit houses respond to the cosmopolitan ecological thought “Man and nature live in harmony” with landscape of simplicity, nature and unity of heaven and humanity. It is not only Chinese nation’s cultural treasure but also a distinguished one in the art of architectural world which forms going through long-term choice and elimination of nature and human society and includes many reasonable ecological construction experience. This paper summarizes its ecological construction experience by researching traditional houses of Dong inhabit villages in Sanjiang, Guangxi to provide guidance for local architectural creation and sustainable development of villages.
The Influence of Sugar Water Reducer on Recycled Concrete Research
Authors: Zha Xiao Xiong , Zhang Kai
Published: August 2011

Recycled concrete aggregates have large porosity, large water absorption and high crush index. The performance reduces dramatically compared with ordinary aggregates. Mechanical properties of recycled concrete aggregates could be improved by adding sugar water reducer. On the basis of the experimental studies, this paper analyzes the influences on recycled concrete setting time and its compression strength at different ages when various amounts of sugar water reducer are used. The mechanism of strength increase is also discussed on the view of porosity. The results show that sugar water reducer has a high enhancement on compressive strength of recycled aggregate concrete, which provides the experimental and theoretical foundation for the application of recycled concrete aggregates in practical engineering.
Characterization Parameters in the Heavy Metal Electrokinetic Removal Process of the Fly Ash
Authors: Yang Ke , Li Dong Wei , Peng Xi
Published: August 2011

Electrokinetic removal is a new kind of technology and it is paid close attention in many countries. This work shows the laboratory results of electrodialytic removal experiments about the fly ash from municipal solid waste in Chongqing. The characterization parameters of the electrolyte solution pH, electric current, electrical conductivity, voltage gradient were discussed after the experiment. The pH value changed smoothly in the cathode compartment, while it changed abruptly in the first 6 hours, but it changed smoothly in the rest time in the anode compartment. The electrical current increased in the first 50 hours, then gradually decreased in the rest time. The higher the electrical current is, the better the removal effect is. The electrical conductivity in the anode compartment increased while the electrical conductivity decreased in the cathode compartment. The higher the electrical conductivity is, the better the removal effect is. The metal hydroxide precipitation was the most serious factor that influenced the removal rate.