bluuebunny/crossref_metadata_2025 huggingface dataset:
A Realization Method of Sound Gathering and Broadcasting System Based on TMS320VC5416DSP
Authors: Jia Shi Sheng , Zhou Mao Ying
Published: August 2011

The sound gathering and broadcasting system in which the TMS320VC5416 is as the control center, the TLV320AIC23 as the codec and G.711 as coding standard is presented in this paper. The composition of the system, the design of the hardware circuit and the programming method of the software are proposed. The configuration mode of the Multichannel Buffered Serial Port (McBSP0 and McBSP1) of TMS320VC5416 and that of the control interface and the digital audio interface of the codec chip TLV320AIC23 are determined. The system realizes the storage and transmission of the digit audio signals well and obtains a high grade effect in time, with DSP chip processing the digit audio signals by means of the G.711 code standard.
Divergent Characteristics of Soil Fungi and Actinomycetes at River Wetland on Typical Steppe
Authors: Shao Yu Qin , Zhao Zi Long , Zhou Hui , Min Hui , Wang Li Xin , Zhao Ji
Published: August 2011

In this study, the composition of dominant microorganisms, such as fungi and actinomycetes, in river wetland soil on typical steppe were measured through Spread-Plate-Technique; the divergent characteristics of these two floras at river wetland and typical steppe were analyzed; and several indicators of soil filamentous microorganisms, for example, diversity, richness, evenness, and dominance, were calculated. The results demonstrated that there is obvious divergence characteristics of terrestrial distribution for predominant flora, i.e. soil filamentous microorganisms, at river wetland on typical steppe. For fungi, there is significant difference between river center (HX), riverside (HB), low floodplain (DQ) & high floodplain (EQ), and typical steppe (DT) for diversity and richness; and there is significant difference between HX and DQ & EQ for evenness. For actinomycetes, there is significant difference between HX & HB, and EQ & DT for diversity and evenness; and there is significant difference between HX, HB, DQ & EQ, and DT for richness. There are certain differences between predominant floras at river wetland and typical steppe. At HX, the most dominant flora is Mucor to account for 100%. At DQ, the dominant floras are Mucor, accounting for 50%, and Cephalosporium, accounting for 50%. At EQ, Mucor accounts for 62.2% and Cephalosporium accounts for 21.1%. At DT, Penicillium has become the dominant flora to account for 69.2%. For actinomycetes, balding group accounts for 100% at HB and 66.7%. At DQ, two dominant floras are balding group and Griseofuscus to account for 38.5% and 41.3%, correspondingly. At DT, the dominant flora is Griseofuscus to account for 61.7%. For filamentous microorganisms at river wetland, two indicators, numbers and diversity, have shown the divergent characteristics that it evolves from humidogene to humidogene﹢terrestrial, then to terrestrial, where soil environment at DQ, EQ and DT are more suitable for the growth of filamentous microorganisms, and the decomposing processes from filamentous microorganisms have facilitated the development and succession process of river wetland. The results have demonstrated a better understanding toward the development and succession mechanisms of river wetland to provide the basis for protection and rational utilizations of river wetland.
Study on the Fuzzy Neural Network Control Used in Wastewater Treatment
Authors: Wang Zhong Qi , Zhao Cheng
Published: August 2011

In this paper, we introduce the study on fuzzy neural network control used in wastewater treatment. An effective fuzzy neural network controller is proposed. The simulation result shows that the system gives strong robustness and good dynamic characteristics. It is used to control dissolved oxygen and forecast water quality. The result indicates that the concentration of dissolved oxygen can reach expectation fleetly and effectively. The model has better precision of forecasting and faster speed of convergence.
Study on the Treatment of Nylon Chemical Industrial Wastewater by AF+ A/O Process
Authors: Zhang Jie , Wang Qun Hui , Li Peng , Huang Hai Ming , Wang Wen Jun , Wu Shao Wei , Xu Chun Liian
Published: August 2011

A company in Pingdingshan of Henan province using a new type of AF (high-efficiency immobilized biological anaerobic biofilter ) and A/O process to treat nylon chemical industrial wastewater, In this study, we monitored the system for one month (Dec.1.2010-Jan.1.2011). The effect of the conditions of temperature, pH and COD, nitrate, ammonia and total nitrogen treatment effect along the system were investigated, the results showed that: average COD removal efficiency reached 97%, average NH4+-N removal efficiency was higher than 90% and the effect of the system is good. The effluent meets the first grade criteria of integrated wastewater discharge standard (GB8978-1996).
The Research of Biogas Slurry on Yield and Safety
Authors: Lv Wen Lin , Wu Jun , Gou Shu Zhen , Yang Gang , Wang Lei , Chen Jiao
Published: August 2011

In this paper, throng studying effect of biogas slurry of different fertilizer rates on wheat yield and some biological traits, found that environmental conditions in the purple, biogas slurry application rate was 3500kg/667m2, wheat yield was maximum; And heavy metals Content in wheat grain would increase with the increasing of biogas slurry application rate, However, compared with conventional chemical fertilizers, the difference was not significant, biogas slurry agricultural would not cause food heavy metal pollution, Wheat planted was in line with food hygiene standards.
TG Analysis on Burning Characteristic of Food Waste Ethanol Fermentation Residue Mixed with Coal
Authors: Su Wei , Ma Hong Zhi , Gao Ming , Li Jin , Wang Qun Hui
Published: August 2011

In order to reduce and re-utilize the ethanol fermentation residue from food waste, this study utilized residues to produce solid biomass fuel and carried out burning test by thermal gravity (TG) analysis. The results demonstrated that the residue from food waste shared the characteristic of high volatile content, high heat potential, low fixed carbon and low ash content. The burnable content was about 86.99% based on dry mass, while the heat potential was 23.06 MJ•kg-1. Lignitous coal or blind coal was adopted as the additive to improve the burning characteristic of the fermentation residue. The result for a mixture of lignitous coal and residue was better than those of blind coal with the increase of complex burning index S from 2.38E-07°C-3•min-2 to 7.99E-08°C-3•min-2, decrease of ignition point, enhancement of average burning ratio and amelioration of burning characteristic. All these provided theoretical guidance for fermentation residue utilization as the solid fuel.
Study of Amino Polymer Modified Soy Protein Adhesive
Authors: Qiu Ying Ying , Li Cheng , Zhang Ji Zhing , Jiang Jin Xue , Zhang Shi Feng , Li Jian Zhang
Published: August 2011

For improving the bonding strength and water resistance of plywood bonded with soy protein adhesive (SPA), an amino polymer (AP) was synthesized using polyamines, and the AP was used to modify SPA to prepare a modified soy protein adhesive (MSPA) in this paper. The plywood was prepared using MSPA, and the effects of preparation technology of amino polymer and hot-pressing technology of plywood on the bonding strength of plywood were investigated. The results showed that the optimization preparation technologies of AP were as follow: the molar ratio of polyamine/modifying agents was 0.25/1, the pH value was 5, the reaction temperature was 70 °C, and the reaction time was 1.5 h. The optimization preparation technologies of plywood were that the hot-pressing temperature was 150 °C and the hot-pressing time was 60 s/mm. The bonding strength of plywood made from MSPA on the optimization preparation technology was 1.03 MPa, which meets the requirement of plywood type II (³0.7MPa). The MSPA bonded plywood had a rather low formaldehyde emission, which is close to that of wood itself.
Spatial Distribution of Heavy Metals in Soybean Plantation Soils in Central Sanjiang Plain
Authors: Niu Jia Tian , Guo Qin Kui , Guo Mei , Li Yi , Wang Qun Hui
Published: August 2011

Monitoring and analysis of the content of five heavy metals (i.e., Cd, Hg, As, Pb and Cr) in soybean plantation soils in central Sanjiang plain were conducted using the geographic information system (GIS). Statistical analysis indicated, strong intensities of spatial correlation among As, Cr, and Pb, whereas moderate intensities of spatial correlation were observed between Cd and Hg. Therefore, the content and the spatial distribution of the heavy metals are primarily affected by the parent material, topography, soil properties, and other internal factors. However, the effect of external factors, such as industrial pollution, farming methods, as well as the application of pesticide and fertilizer, should also be investigated.
Amphibian as a Model to Study Environmental Problem
Authors: Huang Min Yi , Duan Ren Yan , Ji Xiao Li
Published: August 2011

In order to obtain a better insight of the possible threat of environmental factor to wildlife, especially to amphibians, we studied influences of dicofol on heart rate inR. nigromaculataby applying biological signal recording and monitoring system.R. nigromaculatawas injected in ventral lymph follicle in different doses of dicofol solution, and then observed the changes of heart rate after 7 days. The results showed that with the concentration of dicofol solution increasing, the heart rate, systolic tension and diastolic tension changed. The aim of this research is to discuss the cause of dicofol on the physiology in frogs. It can be concluded that dicofol affects the electronic activity of the frog’s heart.
Optimization of Chemical Phosphorous Removal Medicament
Authors: Wang Hui , Li Bin , Ma Wei Fang , Zeng Fan Gang , Fan Hai Tao , Deng Chuan Feng
Published: August 2011

This paper takes the urban sewage as treatment target, analyses chemical phosphorous removal effect of PFS, PAC, PAFSI, PAFC and the PAFC which is used by Wu Family Village sewage treatment plant. Taking into consideration of the economic factors in actual operation, the author proposed that the PAFC used by Wu Family Village sewage treatment plant should be served as a chemical auxiliary medicament, under β ≤ 4.33 conditions, β values and effluent TP concentration showed a good correlation. In this paper, the mixing intensity, mixing time, dosage and pH are treated as mainly investigate factors, the four factors and three levels orthogonal test is established. The flocculation conditions of best treatment effect on the effluent TP are as follows: mixing intensity is 200 r/min, stirring time is 90s , dosage is 220 mg / L and pH is 6.CLC number: X703.5
Optimization Study on Polymeric Ferric Sulfate (PFS) Phosphorous Depth Removal
Authors: Li Bin , Ma Wei Fang , Wang Hui , Zeng Fan Gang , Deng Chuan Feng , Fan Hai Tao
Published: August 2011

This paper studied Beijing sanitary wastewater and investigated phosphorus removal effect and related factors under PFS and polyacrylamide (PAM) synergistic effect. The results show that the effect of phosphorus removal would be improved to a certain extent when the PFS combined with the PAM. The optimum dosage of PAM, the best mixing intensity and time, and the best pH are all defined and the order of coagulation influencing factors is: stirring intensity> pH> stirring time> dosage.
Research on Dynamic Properties of Concrete Steel Tubular Arch Bridge Based on ANSYS
Authors: He Rong , He Wei , Geng Guo Hua
Published: August 2011

Based on ANSYS for modal analysis of bridges, the basic steps includes: building up the FEM model, applying the load and solving the model, expanding the mode, observing the results and so on. Taking the Friendship Avenue Arch Bridge as an example, the building procedures of FEM model were described from the definition of member section, element selection, and the determination of relevant attributes. At last, the dynamic characteristics of the bridge were analyzed based on ANSYS. The results showed that the first 10th order vibration frequencies of the Friendship Avenue Arch Bridge ranged from 1.3Hz to 3.1Hz, and the more order modes should be considered when calculated the dynamic response based on the mode superposition method.
The Application and Research Status of Particle Counter in Domestic and Abroad
Authors: Zhao Zhi Ling , Duan Chun Yi , Lin Ying
Published: August 2011

As a new detection technology，particle counter provides an indispensable data for optimizing and controlling water treatment process. Particle counter has been applied to water supplying in both domestic and overseas. There have been a lot of suggestions and applied researches now. Currently, particle count has been used for monitoring raw water, optimizing dosing quantity of flocculent, monitoring the effect of coagulation-sedimentation, surveying and evaluating the efficiency of filtering filter, monitoring water pipelines, and deep treatment, putting forward scientific and technical support for water treatment.
Mechanism of the Effect of Interface Structure on the Anti-Impact Property of Polycrystalline Diamond Compact
Authors: Fan Wen Jie , Liu Fang
Published: August 2011

Anti-impact property is an important performance parameter of polycrystalline diamond compact. This paper focuses on the research for test method of PDC thermal stability performance. With the improvement method, the thermal stability performance of PDC with five typicals macroscopic interface structure such as planar structure, v-groove, u-groove, ring groove, ring claw-tooth are tested at normal temperature and after heating, With SEM, we study on its mechanism of thermal stability performance due to different macroscopic interfaces structure, analyze the reason why PDC thermal stability performance is different with the changing of PDC macroscopic interface structure. The research result show that the temperature influenced obviously the wear property and the anti-impact property of PDC, and it has great influence on the anti-impact property. The anti-impact property of the vessel-shaped interface structure is better than the flat interface structure.
Geometrically Non-Linear Analysis of Composite Cylindrical Shells and Shallow Sphere Shell
Authors: He Yan , Cui Xiu Qin
Published: August 2011

At present, the plate shell structure is broadly used in the engineering field, and the finite element method is the main method to analysis of the structural design. Because many variables are used in the finite element method and the computation is complex, this paper used Bezier surface patches as the admissible displacement fields to represent the shell’s middle surface displacement and rotation components, the deformation of the composite material cylindrical shell and shallow sphere shell under the loads are studied with a Semi-analytical procedure. The results show that semi-analytical and analytical procedure are in good agreement with the results of the analysis, it can be applied in the project.
Research on the Relationship between SPT and the Ultimate Vertical Bearing Capacity of Jacked Pile in Shenyang District
Authors: Ruan Xiang , Zuo Ren Yu
Published: August 2011

Though the wide applications of jacked pile in engineering in Shenyang district, the problem is also exist in engineering for the capacity of the jacked pile is hard to account. The relationship between the standard penetration test and the ultimate vertical bearing capacity of jacked pile is established in this paper; also an empirical formula is put forward for calculating the ultimate vertical bearing capacity of the jacked pile in this district with blow count of standard penetration test (SPT). The engineering examples indicated that the empirical formula is feasible because the calculating bearing capacity of the silent pipe pile is coincided with the static load tests. The calculated results satisfy the engineering requirement andt can be concluded that the method is also convenient to choose the diameter and length of the pile during the initial stage of design.
Experimental Study on Debonding Load-Carrying Capacity of Cracked Concrete Strengthened with CFRP Sheet
Authors: Xie Jian He , Guo Yong Chang , Chen Lin Jie , Li Li Juan
Published: August 2011

This study conducts a series of experiments on cracked concrete strengthened with carbon fiber reinforce polymer (CFRP) sheet under three-point bending. The purpose is to investigate the effect of concrete crack on plate end debonding load-carrying capacity. 27 specimens were designed considering the pre-crack location, CFRP bond length and CFRP bond width. The results show that an abrupt change of the interface shear stress arises at the location of crack, and the debonding load-carrying capacity increases with the increase of CFRP bond length or CFRP bond width. However, when the concrete crack location is closer to CFRP end, the debonding load-carrying capacity is lower.
Empirical Formula of Chemical Grouting Pressure in Porous Media Based on Similarity Theory
Authors: Wang Dang Liang , Gao Yue
Published: August 2011

Based on similarity theory and model test, this paper proposes the empirical formula of chemical grouting pressure in porous media that mainly reflects the characteristics of grouting machine, grouting materials, and the propriety of geotechnical medium. This formula reflects the complex grouting process in a simple way. And the orthogonal experiment results indicate that the factors affecting grouting pressure are the permeability of rock mass, grout viscosity, and grouting pump flow. Based on the empirical formula, and according to the achievement in fluid mechanics, this paper further studies and proposes the empirical formula of grouting pressure influenced by pipelines
Numerical Analysis of Slab Culvert Beneath Imperfect Ditch Covered with Geogrid Layers
Authors: Zheng Jun Jie , Luo De Pi , Ma Qiang
Published: August 2011

The overburden of high embankment culvert is over 10 m, such high fill always leads large earth pressure on the slab of the culvert. The imperfect ditch covered with geogrid method was employed to reduce the vertical earth pressure on the slab. A series of numerical analyses were performed to investigate the load reduction effect of the imperfect ditch. In the simulation, the number of geogrid layers, the geometry of the load reduction ditches, as well as the location and the stiffness of the geogrid are investigated to analyse the influences on the vertical earth pressures. The results show that the slope angle and the height of the ditch, the plane stiffness of the geogrid have great effect on the load reduction efficiency, ditches with higher height and a slope of 90°lead to a significantly reduction on vertical earth pressures on the crown of culverts. The width of load reduction ditch, number of geogrid layers, the location and spacing of the geogrids have little effect on load reduction, the results can provide references for load reduction of slab culvert.
Technical Assurance for Construction Quality Management
Authors: Jiang Hao Hao
Published: August 2011

The construction technical management occupies an important place for ensuring the construction quality in the project construction activities. Its tasks cover: correctly carry out the State’s technical policies, supervision procedures, technical specifications and standards; rationally arrange the construction work procedures in conformity with scientific laws; properly develop the technical programs for construction work; provide complete basis and execution evidence for technical work and ensure that the construction quality is in compliance with the requirements of design documents, applicable standards and the contract. So we must normalize the construction quality management work of project and guarantee the construction quality of the project.
Study on Gas Permeability Test in Water Sand and Gravel Stratum
Authors: Hu Hui , Qiu Wen Ge
Published: August 2011

Water sand and gravel stratum is characterized by high gravel content, big grain size and high strength, easy permeation for water and air, brittleness and hysteresis quality in stratum failure, causing great difficulties in EPBM hyperbaric intervention and changing cutter tools working under air pressure. Due to the special geological conditions and no useful reference or criterion about gas permeability in such stratum all over the world, gas permeability test is done to fetch air loss data in natural state and bentonite-added state.Based on the practical situation of ChengDu Metro Line 1-Lot 3 project, by using methods of site test and theoretical analysis,the air loss before/after bentonite is added are given: At the air pressure of 1.0 bar, the air loss with bentonite added is 27% of that without bentonite. The acreage of pressure air loss around excavation face is from 35.2 m2 (In case of half chamber muck and bentonite slurry is 100% in effect around shield machine) to 129.6m2 (In case of empty chamber and bentonite slurry is 50% in effect around shield machine), providing reference in choosing air compressor, also for other project in this stratum and similar project.
Preparation and Characterization of Molecularly Imprinted Polymer Microspheres of p-Nitroaniline
Authors: Yang Ming , Sun Qian , Li Cai Yun
Published: August 2011

Polystyrene microspheres were prepared by the emulsifier-free polymerization method. Using the polystyrene microspheres as seeds, p-nitroaniline as template molecules, the monodispersed molecularly imprinted polymer microspheres (MIPMs) were prepared by a single-step swelling and polymerization method. The monodispersed molecular imprinted polymers with porous structure were characterized by SEM, and UV-visible spectrophotometry. The adsorption performance of MIPMs for p-nitroaniline was investigated.
Design of Breathing Air-Condition Cabinet Based on Capillary Tube Combined with Heat Exchange and Dehumidification
Authors: Liu Xiao Rui , Li Bao Yu , Han Dong Tai , Lv Xue Yong
Published: August 2011

Capillary tube, a efficient and energy conservation heat exchanger, has been widely used abroad. In china, the research of air-condition terminal based on capillary tube is focus on the planar radiation at the moment. But kinds of problems such as moisture condensation happen because of the different climate of China. So we put forward developing a kind of breathing air-condition cabinet combined with heat exchange and dehumidification, and do some calculation about major parameter. We will do in-depth study on cabinet's flow field so that it can be high-efficiency.
Experimental Study of Dynamic Development and Fractal Law of Mining Rock Fracture
Authors: Liu Xiu Ying
Published: August 2011

This paper designs the physical model as geological conditions of XinZhi mine 2204 face of Huozhou Bureau of Mines in Shanxi province, it simulates the formation process and distribution of the mining rock fracture using simulation experiment of similar material, and researches the evolvement law of rock’s fracture network in caving zone, fractured zone using fractal geometry theory. The conclusion of the experiment indicates: with the advance of the working surface, the rock fracture develops from bottom to top, the different fracture network forms corresponds to the different push distance of the working surface, the latter network piles up the previous network, mining makes more complex distribution of rock fractures. The amount of overlying strata separation is three-stage separation law of development, including Initiating phase separation, Expansion phase separation and closed phase separation. Critical layer to any point along the separation experienced by the small → large → small and stable process of change. At the same time, the fractal dimension of the mining rock fracture goes through small to large, under the identical mining width, the fractal dimension of fractured zone is caving zone of 80% to 90%, at last, when the mining work is finished, the fractal dimension dropped to a more stable value.
Green Design Concept of Ergonomics in Industrial Design and its Wide Application in the Graphic Communications Industry
Authors: Cheng Chang Xian
Published: August 2011

Today’s industrial design has gone beyond the traditional product design. China is in the transfer process from the world's manufacturing plant to the world's manufacturing center. Green design is the basis of access to green products, and has become one of the hot researches in design areas. The results show that the design phase determines the 70% to 80% of manufacturing cost, while the design itself accounts for only 10% of the total cost. The importance of the roll of design to product is still increasing if considering the environmental factors. Because the level of ecological damage caused by the product design is far greater than the level of ecological damage caused by the design process itself, only in the design stage should the "green level" of products be taken as a design target, the desired design result could be achieved, which is one of the goal of ergonomics. In today's information society, the graphic communications industry is charged with an irreplaceable task of information manufacture and dissemination. A variety of devices (including electronic, optical, mechanical equipment and instruments, and even household facilities and equipment, etc.) used by the modern graphic communications industry need the direct contact, operation or use of the operator. Design and manufacture of these devices need to apply modern ergonomic design theory and research results. In this paper, the importance of ergonomics, the features and research aspects of green design, developing trends of ergonomics, and the application of ergonomics in the graphic communications industry are described.
Research on Planning and Design of High-Rise Buildings in Baotou from the Perspective of Urban Environment
Authors: Ding Yu Xian , Wang Jia Rui , Ding Yu Xin
Published: August 2011

The development of economic has cause many problems about emerging and dense concentration of High-rise buildings in Baotou,so that the urban natural environment, urban living environment, urban spatial structure ,the urban cultural environment have been greatly affected.Therefore, this article discusses the problem about high-rise buildings from the perspective of the urban environment, with an aim to find a harmonious development method on high-rise buildings and urban environment.
Experimental Investigation and Design of Aluminum Beams with Longitudinal Welds
Authors: Wu Yun , Zhang Qi Lin
Published: August 2011

This paper presents an experimental investigation of longitudinally welded aluminum I-section beams subjected to concentrated force. The specimens were fabricated using 6061-T6 heat-treated aluminum. The test program included 10 beam tests contained 2 test series according to different welding section, i.e. T-shape section and P-shape section. The test results were compared with the design strengths predicted by the European Code and the suggested formula in the paper for welded aluminum beams. The purpose of this paper is to present the tests results of two typically longitudinally welded I-section aluminum beams, and to validate the accuracy of the recommended design formula.
The Eco-Community Evaluation System of Taiwan: An Introduction to EEWH-EC
Authors: Chuang Hui Wen , Lin Hsien Te , Ho Ming Chin
Published: August 2011

The Ecological Community Evaluation System (EEWH-EC) of Taiwan was proposed in 2009 and is focused on evaluating the entire community. It is a member of the EEWH family of green building assessment system. The purpose of this study is to introduce the EEWH-EC. The evaluation system includes five assessment categories: ecology, energy conservation and waste reduction, health and comfort, service function, and crime prevention. Communities can apply this system to assess themselves, determine their special characteristics, and use the outcome to implement improvements. The government can utilize the evaluation result to make policies for better and sustainable environments for citizens.
Mechanical Properties of Rice-Husk Cement Composites Modified by SAE
Authors: Xiong De Sheng , Han Fu Qin , Chen Mo
Published: August 2011

Cement-based composites were prepared from rice husk and styrene-acrylic emulsion (SAE) with semi-dry production process. The volume of SAE, the rice husk content and alkali treatment on the properties of the composites were studied. Particle-matrix bonding were observed with scanning electron microscope (SEM). The mechanical test of the rice-husk cement composites proved that SAE is an effective additive for reinforcing the composites, the mechanical properties improved significantly by alkali treatment and adding SAE. the properties can meet the requirement of the china building material standard(JC411—2007) when the content of SAE reached 3%.
The Parameter Assessment for GHPC Performance of Anti-Sulfate Erosion
Authors: Qiao Hong Xia , Cao Hui , Yu Hong Fa , He Zhong Mao
Published: August 2011

After the assessment targets on concrete performance of anti-sulfate erosion were optimum designed rationally to be assessment parameters, the course on performance deterioration of concrete was characterized using designed assessment parameters. The results show that, every performance deterioration degree of concrete can be compared on the same coordination axis by assessment parameters. The assessment parameters were applicable the same determination criterion, and the determination principle is simple and convenient. The comparing the deterioration course and sensitivity degree of concrete performance is much easy. It is better to judge concrete performance state that the GHPC performance of anti-sulfate erosion has been assessed with assessment parameter designed in the paper.
Experimental Study on Sprayed Concrete Mixed with Magnetized Water
Authors: Wang Xing Guo , Li Li , Zheng Yu Zhou , Wang Yi Xing
Published: August 2011

The magnetized water which is used to mix concrete can improve the performance of concrete. This paper presents the effect of magnetized water on performance of sprayed concrete in laboratory, also carries out the changes of dust concentration and rebound rate of sprayed concrete mixed with magnetized water in mine roadway. The results indicate that the early strength of concrete mixed with magnetized water has been obviously improved and the dust concentration and the rebound rate can be effectively reduced while spraying concrete.
The Test Analysis of Asphalt Mixture Permeability Based on Modified Osmotic Pressure Meter
Authors: Guo Xue Dong , Fang Xiang Yang , Cao Jian
Published: August 2011

In this study, we can measure the permeability of Marshall specimens by modified osmotic pressure meter, which is improved by osmotic pressure meter. We get different voidage Marshall specimens and rutting plates by changing compaction times and rolling times. Modified osmotic pressure meter measures the permeability of Marshall specimens. Pavement ooze water meter measures the permeability of rutting plates. The results showed that: Because of the internal air, side sealing and different formula, the permeability coefficient measured by Pavement ooze water meter is not accurate. Modified osmotic pressure meter eliminates many adverse effects when we measure the permeability of asphalt mixture. So the correlation of voidage and permeability coefficient is better.
Research on Recycled Fine Powder Applied in Mortar
Authors: Chen Xue , Li Qiu Yi
Published: August 2011

The basic properties and its influences on mortar properties are studied for the purpose of using recycled fine powder. Results show that mortar water assumption increases and the compressive strength declines with the increase of recycled fine powder content. Efficient ratio of recycled fine powder is propounded for the first time to reflect the contribution of recycled fine powder with different content to mortar strength. It is greater than 1 and thus has certain contribution to mortar strength when recycled fine power content being less than 28%, which reaches the maximum as being 14%.
Study on Vertical Wind-Induced Vibration Response for Portal Frame Structures
Authors: Liang De Zhi , Huang Min
Published: August 2011

In recent years, as the portal frame’s height toward higher and the span toward wider, the influence of wind vibration becomes more and more prominent among the portal frame structure. In the design of the portal frame, there are many different opinions on whether considering the impact of the vertical wind vibration to the portal frame. This paper taking a true engineering as an example, using finite element software to establish the solid model of the portal frame structure, selecting the junction of purlin and roof as a node of imposing vertical fluctuating wind load, we made numerical simulation analysis of vertical wind vibration. The simulation results will be compared with data of the internal forces and deformation under the average wind pressure. The results showed that: vertical wind vibration has a prominent effect to the portal frame and should be considered in the design.
Frequency Domain Analysis on Horizontal Wind-Induced Dynamic Responses of Light-Weight Steel Structures with Gabled Frames
Authors: Liang De Zhi , Song Xiao Juan
Published: August 2011

Wind-induced dynamic responses of light-weight steel structures with gabled frames are significant because of their light weight, small stiffness and long natural period, according to Reference [1]. While the current "Technical specification for steel structure of light-weight buildings with gabled frames" (CECS102:2002) and "Lode code for the design of building structures” (GB50009-2001) generally don’t consider the wind-induced vibration influence of gabled frames. Based on rational model, the light-weight steel structure with gabled frame subjected to wind load is simulated by finite element software. The numerical simulation about horizontal wind-induced vibration response is carried out. Calculated results show that the influence of horizontal fluctuating wind load is harmful for light-weight steel plants with gabled frames and suggest that more attention should be paid in design.
Study on Mechanism of Slope Instability with Weak Interlayer
Authors: Wang Yun Fei , Zhong Fu Ping , Chu Huai Bao , Wang Li Ping
Published: August 2011

In the process of the highway building, especially in mountain region the some complex geological conditions often appears. In this paper, using the slope of highway with weak interlayer as the research subject, systematically analyzing the stress field and plastic field during the excavation of the slope, obtained the failure mechanism of the slope with weak interlayer, which is a cyclic process that weak interlayer shear failure led to the tensile failure of its upper mass rock. It has extraordinarily important guiding significance for the protection and reinforcement of similar slope.
The Influence of Volume Surface Ratio of Rectangle Air-Conditioning Duct on Particle Deposition
Authors: Zhang Jie , Liu Ze Hua , Liu Yuan Quan , Li Hui Min , Ning Yong Fei
Published: August 2011

This paper discusses particle deposition in rectangle air-conditioning duct using RSM (Reynold Stress Model) and random trajectory particle model. Particle with nominal diameters of 10-200μm are simulated at each of three nominal air speed: 4m/s, 6m/s and 8m/s, respectively, in the cross-section sizes of 160×120, 500×250, 1000×320mm. In simulation, the paper compares and analyzes the influence factors of particles deposition in volume surface ratio of the given duct. The results show that: 1) particle deposition velocity increases with volume surface ratio; 2) As the inlet air speed increasing, when the particles deposited to floor and vertical wall, the image of dimensionless deposition velocity Vs dimensionless relaxation time shows a coincident trend when the duct cross-section sizes are 500×250, 1000×320mm, but has great differences with the image of 160×120mm.
The Influence of the Temperature in Severe Wear of Copper Contact Wire/carbon Strip under Electric Current
Authors: Ding Tao , Chen Guang Xiong , Xiong Zeng Gang , Xie Li , Wu Chuan Xue
Published: August 2011

A series of experimental tests were carried out using copper contact wire rubbing against carbon strip under electric current on a pin-on-disc test. The aim to experiment can be understand the roles of the thermal wear in severe wear of copper/carbon strip under electrical current passage. During testing, the contact temperature and friction coefficient were recorded. The wear volumes of carbon strip specimens were measured. The results indicate that the temperature rise of contact couple with and without electric current is distinctly different. And the friction coefficient increases firstly due to the accumulation of wear debris, and then decreases with the increasing of electric current due to the accumulation of electric heat and friction heat on contact interface. It can be found that the wear volumes of carbon strip samples with electric current are larger than those without electrical current. Several thermal wear tests were conducted to study the influence of the temperature on the wear of carbon strip samples. The result indicates that thermal wear, oxidation wear and abrasive wear are a main mechanism for the severe wear of carbon strip samples.
Study on Energy Saving Effect of Heat-Reflective Insulation Coating on Exterior Walls of Building in Summer
Authors: Guo Wei Lin , He Chao , Fukuhara Teruyuki
Published: August 2011

This paper presents an experimental study on the energy saving effect of reflective coatings on exterior walls. Two identical test buildings were built in Zhejiang College of Construction, one of which is covered with reflective coatings and the other not. The wall temperature fluctuation of both buildings is monitored in summer, which includes the east, south and west walls. The results indicate that the maximum reduction of wall temperature is 9-10 °C in the building with reflective coatings, compared with wall temperature in the other without it. The reduction in heat gain of east, south and west walls is obvious, so is the cooling effect. The reduction in electricity consumption of air-conditioning system in the building with reflective coatings is 0.94 KWh/m2 per month times by calculation, which well proves the energy saving effect of reflective coatings.
The Analysis of Lateral Displacement Target of Unstiffened Steel Plate Shear Wall Based on the Performance Designing
Authors: Shi Yong Jiu , Xu Jian , Dai Guo Xin , Wang Yuan Qing
Published: August 2011

A typical three-story unstiffened Steel Plate Shear Wall (SPSW) finite element model was established. Systematic parameters analysis of the development and changing process of the lateral stiffness and shear capacity was mainly carried on the middle standard layer. The result shows that the lateral stiffness of thin SPSW has been always in decline and has a higher shear capacity after buckling. According to lots of analysis data and different stages of lateral control targets in the new revised seismic design code for performance designing, the lateral limits of the SPSW were respectively qualified under wind loads and frequent earthquake.The test verification was also proposed to verify the restrictive lateral limits so as to supply a scientific basis for the preparation of SPSW design method.
Finite Element Analysis of High-Type Large Capacity End-Plate Connections
Authors: Shi Gang , Fan Hao , Shi Yong Jiu , Wang Yuan Qing
Published: August 2011

Compared to the traditional configurations, beam-column end-plate connections with two bolt rows located at the external side of the beam tension flange, i.e. high-type large capacity end-plate connections, could stand greater loading. However, seldom research on the static behavior of high-type end-plate connections has been done in China while specification in America has provided corresponding design approaches. In this paper, detailed verified finite element model will be employed to analyze the static behavior of 7 high-type end-plate connections with different configurations. The influence of parameters such as end-plate thickness, bolt layout, end-plate configuration and stiffener geometry has been investigated. The simulation results demonstrate that (1) when the maximum transferred tension force by a single bolt reaches 0.8P, the tension force of the bolts does not satisfy the assumption of linear distribution but depends on the boundary conditions of the bolts; (2) the shear force in the connection is transferred by the contact surface of the end plate and the shear force directly transferred by the bolts is tiny and extremely uneven; (3) considering the effect of the connection configurations, whether the end plate at the compression side is extended or not has little effect on the static behavior of the connection but the geometry of the end-plate stiffener and the distance from the bolt axis to the beam web have great contribution to the initial stiffness of the connection; (4) at ultimate state even the bolts located near the beam axis have significant contribution to the loading capacity of the connection. Then, a model of the bolt transferred tension force distribution has been proposed. What’s more, based on the observation of the stress contour of the tension part of the end plate, a yield line model has been proposed. All these results are important to propose a design approach for the high-type end-plate connection. Introduction
Stability Analysis of a Viscoelastic Ring Subjected to Uniform Pressure
Authors: Yang M
Published: August 2011

Based on Boltzmann’s viscoelastic theory, the mathematical model of a free-standing viscoelastic ring subjected to uniform pressure is established by applying assumed modes method, Galerkin method and numerical method. It is found that, the free-standing viscoelastic ringing has both a stantaneous critic load and a durable critic load under uniform pressure. The influence of structure size and parameters of the material are discussed, The evolutionary trend of the system is also investigated.
Seismic Performance of RC Frame with Shape Memory Alloy Bracing Bars
Authors: Liao Wen I
Published: August 2011

In this study, high seismic performance RC frames have been proposed to have Shape Memory Alloy (SMA) bars acting as a kind of structural bracing system at both sides of a frame to increase the energy dissipation capacity of the RC frame. The type of SMA bar used in the study is the Superelastic SMA bar. The force-displacement hysteretic loops of the RC frame with SMA bars under seismic loading are presented and compared with the test results of the bare RC frame. Test results show that the SMA bars can effectively reduce the maximum story drift of the tested frame. It was found that the reduction of story drift and base shear was depending on the characteristic of the input ground motions.
Analysis of Performance of Suspended Pre-Stressed Steel Shells with Large Span in Fire
Authors: Wang Xin Tang , Yin Jie , Zhou Ming , Xie Zhi Guo
Published: August 2011

The computational model of numerical analysis of a suspended pre-stressed steel reticulated shell subjected to fire load is established with using the software Marc. Based on the model presented here, numerical analysis of thermal response and structural response of the pre-stressed steel structure are computed for the key nodes of the structure. The different location of fire source and different space height are considered for analysis of response temperature, displacements and stresses of the pre-stressed lattice shell. It is shown that the air temperatures was much higher than the response temperatures of the nodes of the lattice shell during a quite period of time after a fire takes place, and the temperature of the cable nodes are also less than the air temperature near the nodes. It is also concluded that displacement of the node right above the inner cable is the maximum among the four nodes as the fire source is located at the position under the middle cable.
Microwave Treatment for Pine Wood Deresination: Mathematical Model and Validation
Authors: Li Xian Jun , Mou Qun Ying , Lv Jian Xiong , Liu Yuan , Cai Zhi Yong , Wu Yi Qiang
Published: August 2011

Microwave treatment is a newly developed technique to expel resin from pine wood by generating high internal steam pressure. To understand the mechanism of deresination process during the treatment, a mathematical model was developed and was used to predict its critical conditions. The model indicated that the critical pressure inside Masson pine wood was 1.17×105Pa and its corresponding critical temperature was 104 °C in order to expel the resin mixture from the interior to the surfaces. The experiment results showed that during microwave deresination large quantities of the resin overflowed to the wood surfaces when the temperature of the pine wood was controlled in the range 104-112°C. The result observed during the microwave treatment matched well with the critical temperature predicted from the simple mathematical model. The validated model could provide some understanding and improvement of microwave deresination process.
Stability Analysis of Plate-Cone Reticulated Shell
Authors: Wang Xing
Published: August 2011

This paper carries out stability analysis on plate-cone reticulated shell considering geometrical nonlinearity of cooperating work between plates and members. In this paper, stability behavior of different kinds of plate-cone reticulated shell considering geometrical nonlinearity is analyzed by using the software ANSYS, tracking complete process balance path for load-displacement by using arc-length method, the several problems of plate-cone reticulated shell are studied, such as destruction mechanism, structural ductility, ultimate bearing capacity and strength reserve, some important conclusions are obtained. After analyzing the stability behavior of double-layer reticulated shell by ANSYS and comparing with plate-cone reticulated shell, it is proved that plate-cone reticulated shell is more advantageous than double-layer reticulated shell in the aspect of stability behavior.
Test Research on the Performance of Wood Frame Shear Walls under Lateral Load
Authors: Liu Yan , She Chen Gang , Zou Xiao Jin
Published: August 2011

Sixteen full-size single-storey shear walls 6.0 m in length and 2.44 m in height were tested: half with a flexible and half with a rigid load spreader. In addition, four full-size shear walls representing a typical two-storey configuration were tested. Comparisons of the initial stiffness, ultimate load and displacement, energy dissipation and axial force in anchor bolts of the test walls are presented. An increase of lateral load capacity due to rigid load spreader beam and from a second storey has been confirmed.
The Stress Variation and Mechanism of Bearing Capacity Increment in Reinforced Foundation
Authors: Yi Peng Ying
Published: August 2011

For study the influence caused by geobelt and the mechanism of the strength increment in the reinforced foundation, the author analyzed stress state in each zone with reinforced and unreinforced, combined with the Mohr-Coulomb yield criterion, found the stress variation relationship between and in both foundations, which are found by the stress analysis method and geometry analysis method under the extreme state condition. The extreme normal stress incremental of vertical direction was solved in reinforced foundation. The essence of strength increment in reinforced foundation is revealed. The reliability of theoretical analysis was proved by numerical simulation. The conclusions show that increases in the active extreme equilibrium zone I and the passive extreme equilibrium zone Ⅲ, increases upper geobelt and decreases under geobelt in the transition zone ; the normal stress of each zone have changed correspondingly, the incremental variation of in I zone and the in Ⅲ zone has pseudo-cohesion.