Wang Y.,China Machinery International Engineering Design and Research Institute Co.
Polymer Composites | Year: 2015
The use of environmentally friendly natural fibers as building materials is benefit to achieve a sustainable construction. This article performs a study on the use of natural jute fibers as reinforcement of concrete and natural sisal fibers in fiber reinforced polymer (FRP) composites as concrete confinement, i.e. sisal fiber reinforced concrete (SFRC) composite column wrapped by jute FRP (JFRP) (SFRC-JFRP). Uniaxial compression test was conducted to assess the compression performance of the composite columns as axial structural member. A total of 24 specimens were tested. The effects of JFRP wrapping thickness and sisal fiber inclusion on the compressive performance of the composite columns were investigated. Results indicate that JFRP confinement significantly increases the compressive strength and ductility of both PC and SFRC with an increase in JFRP thickness. Besides, the inclusion of sisal fiber further enhances the strength as well as the efficiency of confinement under uniaxial compression. Also, the models for ultimate strength and ultimate strain of PC-JFRP and SFRC-JFRP are proposed. © 2015 Society of Plastics Engineers.
Tie J.,North China University of Water Conservancy and Electric Power |
Li P.,China Machinery International Engineering Design and Research Institute Co. |
Xu Z.,North China University of Water Conservancy and Electric Power |
Zhou Y.,North China University of Water Conservancy and Electric Power |
And 2 more authors.
Desalination and Water Treatment | Year: 2015
This study investigated the feasibility of Moringa oleifera seed cake powder (MOSCP), a natural product after oil extraction, for Congo red (CR) removal from aqueous solution. Coagulation experiments indicated that CR was efficiently removed by MOSCP in short time. Fourier Transform Infrared Spectroscopy spectra showed that large amount of proteins was contained in MOSCP. The removal of CR was contributed to both the adsorption and charge neutralization of proteins on the surface of MOSCP particles, and nucleation of these particles. No significant impact of solution pH was observed on CR removal under acid and neutral conditions, but the CR removal decreased remarkably with increasing pH under basic condition. An optimal MOSCP dosage was found that was linearly proportional to CR initial concentration. © 2014, Balaban Desalination Publications. All rights reserved.
Wang J.J.,Shandong University |
Tang Z.Z.,Staffordshire University |
Gui Y.W.,China Machinery International Engineering Design and Research Institute Co. |
Wu W.Y.,Staffordshire University |
Zhao M.,Harbin Institute of Technology
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016
In order to quickly locate the leakage in urban water distribution network, a model of pressure-dependent leakage detection is developed based on the principle that the leakage is positively correlated with the pressure. Particle Swarm Optimisation (PSO) is applied to solve the model, and the feasibility of pressure-dependent leakage detecting method is verified by using a test function. Finally, the model is applied in the water distribution network of City A to locate leakage. As a result, simulating leakage nodes are located within the range of 125 m to 467 m from actual leakage nodes, which indicates that the developed model can significantly improve the efficiency of leakage detection. © 2016 Taylor & Francis Group, London.
Hou F.D.,China Machinery International Engineering Design and Research Institute Co. |
Wang F.,Nanjing University of Science and Technology |
Nie X.B.,Changsha University of Science and Technology
Applied Mechanics and Materials | Year: 2014
Excessive propagation of Tubifex tubifex in eutrophic source water can result in the emergence of them in the drinking water plant, which has been a troublesome problem in recent years. Our objectives were to investigate the driving force of drift and quantify the influence of temperature and DO on the worm drift. Results showed that one of the major driving forces of the worm drift was water flow, which exhibited its effect by direct shear stress on the worm or inducing sediment suspension. The worm drift rates were increased with the decrease of temperature and DO content. The results confirmed that worm drift from sediment to overlying water, which was induced by water flow and could be influenced by temperature, DO content and sediment property was the main cause of worm pollution in drinking water plant. © (2014) Trans Tech Publications, Switzerland.
Tan W.,Changsha University of Science and Technology |
Wang Y.,Changsha University of Science and Technology |
Yu C.,Changsha University of Science and Technology |
Pan Z.,China Machinery International Engineering Design and Research Institute Co.
Chinese Journal of Environmental Engineering | Year: 2013
Modified zeolite was used to treat groundwater with high iron and manganese, NaCl, HCl and microwave were used to strengthen its absorption. The experimental results showed that zeolite modified by NaCl was the best to remove iron and manganese. When zeolite modified by NaCl of 25%, the removal rate of iron increased 13.81%, manganese removal rate increased 26.4%. The amount of zeolite adsorption of manganese and iron synchronous enhanced. The presence of iron or manganese can make the other's adsorption capacity decreased. Deal with zeolite filter column, with residence time of 1.0 h, iron removal efficiency is 62.3%, and manganese removal efficiency is 58.3%.
Zhao J.,China Machinery International Engineering Design and Research Institute Co. |
Yao T.,Jiangsu Research Institute of Building Science
Journal of Hohai University | Year: 2012
In order to effectively control the cost of pipe materials in engineering, the ring-bending stiffness of buried round plastic pipeline needs to be accurately determined. Comparison of the calculated value and engineering experience shows that the value deduced by the ring-bending stiffness of the anti-deformation limit is accurate. In the ring-bending stiffness calculation, parameter selection, especially the selection of the soil deformation modulus, had a significant effect on the calculation results. The calculated results show that to obtain accurate soil deformation modulus is vital to determination of the ring-bending stiffness.
Zhao Z.,Nanjing University |
Sun Y.,Nanjing University |
Xu J.,China Machinery International Engineering Design and Research Institute Co. |
Rong S.,Nanjing University |
Zhang Y.,Nanjing University
Chinese Journal of Environmental Engineering | Year: 2014
Under the liquid conditions, the adsorption of triallyl isocyanurate(TAIC) on the powdered activated carbon was examined by the static adsorption method. Moreover, the process conditions of TAIC adsorption on the powdered activated carbon in chemical wastewater was studied by the univariate analysis method. The results showed that the removal efficiency of TAIC in simulated wastewater with initial concentration of 800 mg/L and pH of 7 was up to 96.17% when the temperature, rotational speed, dosage of the activated carbon and adsorption reaction time were 298 K, 150 r/min, 4.4 g/L and 50 min, respectively. While in practical wastewater with initial concentration of 1500 mg/L and pH of 3, the TAIC removal efficiency was up to 46.8% when the temperature, rotational speed, dosage of the activated carbon and adsorption reaction time were 298 K, 150 r/min, 10 g/L and 2 h, respectively. This was due to the complicated components and competitive adsorption mechanism of other organics.
Yang H.,Chongqing University |
Mo L.,Chongqing University |
Mo L.,China Machinery International Engineering Design and Research Institute Co. |
Chen J.,Chongqing University |
Fu J.,Chongqing University
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014
Inelastic deformations of reinforced concrete beam-column joint consist of longitudinal rebar slippage at beam end and shear deformation of joint, which affects the elasto-plastic mechanical characteristics of beam-column subassemblage specimen obviously. The Modeling methods of inelastic deformation of joint will directly influence the rationality of structural response analysis results under strong earthquake excitations. On the basis of fiber model, the modeling method of combining a zero-length section element at the ends of the nonlinear beam-column element could conveniently and effectively simulate the inelastic deformation of joint. Based on the significance analysis and nonlinear fitting results of the measured experimental data of 39 reinforced concrete interior joints and 12 exterior joints, a constitutive model of σ-sslip-shear which could simulate the effect of longitudinal rebar slippage at beam end and joint shear deformation simultaneously was proposed. Four beam-column subassemblage tests with different joint parameters were used as examples to verify the proposed modeling method. The results show that the calculated results of capacity and energy dissipation behavior of beam-column subassemblage is much higher if inelastic deformation of jointis ignored. Inelastic mechanical characteristics of beam-column subassemblage could be simulated more accurately when inelastic deformation of joint is considered, and the deformation characteristics that the plastic deformations will transfer from ends of element to the joint while the inelastic deformation of joint is increasing could also be simulated.
Yang H.,Hunan University |
Liu Z.-H.,Hunan University |
Li X.-M.,Hunan University |
Li X.-M.,Guangxi University |
And 5 more authors.
Huanjing Kexue/Environmental Science | Year: 2012
In this paper the feasibility of enhanced electricity generation of microbial fuel cell fed surplus sludge by additional enzymes (neutral protease and α-amylase) was discussed. The effect of dosage of additional enzyme on characteristics of electricity generation of the surplus sludge microbial fuel cell(SSMFC)and the reduction of surplus sludge were investigated. The results indicated that the maximum output power destiny of the group of experiment was higher than that of control under the same condition. Moreover, the maximum output power density, coulomb efficiency, efficiency of reducing TCOD, efficiency of reducing TSS and efficiency of reducing VSS reached up to 507 W·m-2(700 mW·m-2), 3.98%(5.11%), 88.31%(94.09%), 83.18%(98.02%) and 89.03%(98.80%) respectively for protease(α-amylase) at the dosage of 10 mg·g-1. This study demonstrated that additional enzyme greatly enhanced the electricity generation of MFC with simultaneous accomplishments of sludge treatment, providing a novel approach for the practical application of microbial fuel cell.
Su Y.-R.,Central South University |
Su Y.-R.,China Machinery International Engineering Design and Research Institute Co. |
Chai L.-Y.,Central South University |
Yang Z.-H.,Central South University |
And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2011
The pannonibacter phragmitetus T1 was used as bio-sorbent, the effects of the factors such as the metabolic activity of bacteria, culture time, pH value, biomass concentration, temperature, adsorption time and initial concentration of metal ions on the biosorption of Pb 2+ were determined, and the adsorption mechanism was further discussed. The results show that the maximum adsorption capacity of T1 for Pb 2+ reaches 68.35 mg/g under the optimal conditions as the Pb 2+ concentration of 150 mg/L, pH value of 6, the nonliving bacteria cultured after 12 h with the biomass of 0.5 g/L, and temperature of 30°C. The kinetic study of the adsorption shows that the adsorption process of Pb 2+ is rapid, and finishes in 90 min. The adsorption process is well accorded with the Pseudo-second order model and Langmuir model. The analysis of the FTIR spectrum indicates that the hydroxyl and amide are the main reactive groups on the surface adsorption.