Mo L.,Nanjing University of Technology |
Deng M.,Nanjing University of Technology |
Wang A.,Nanjing University of Technology |
Wang A.,Anhui Institute of Architecture and Industry
Cement and Concrete Composites | Year: 2012
Expansive additives are widely used to compensate the drying shrinkage of cement-based materials to avoid cracking. However, the expansion of conventional ettringite-bearing expansive additive depends strongly on wet curing and is mainly generated at early age, and hence it may not work well in concretes without sufficient water supply or exhibit long-term shrinkage. MgO-based expansive additive, for which less water is needed for the formation of Mg(OH) 2 in comparison to ettringite, was prepared and its compensating effect on the autogenous shrinkage and late age thermal shrinkage of Portland and fly ash cement pastes at low water-to-cement ratio was investigated. The tests were conducted under sealed condition, so that the moisture exchange with the environment was prevented. Results show that, even under the non-wet curing condition, the shrinkages of cement pastes can be compensated effectively. Microstructure analysis by scanning electron microscope indicates that the macro-expansion of cement pastes is probably caused by the locally restrained expansion of MEA due to the hydration of MgO. © 2011 Elsevier Ltd. All rights reserved.
Wang D.,Anhui Institute of Architecture and Industry
Advanced Materials Research | Year: 2011
Soil water characteristic curve is one of important topics of unsaturated soils. Pressure plate extractor and GDS unsaturated triaxial apparatus are used to study influencing factors including types of soils and net mean stress. Through method of least-squares, Fredlund five-parameter model were employed to fit soil-water characteristic curves. The results show that model provided a satisfactory fit to the experimental data. Through an analysis of influencing factors, we find that not only physical condition of samples but also external stress condition can affect the shape of soil water characteristic curve.
Wang S.,Anhui Institute of Architecture and Industry
Applied Mechanics and Materials | Year: 2013
With the accelerated pace of urbanization in China, more and more around the town 's land development, but most of the towns architectural form in a chaotic, self-development conditions, constitute urban architectural form of the four elements: building color, spatial composition, four aspects of the architectural style and building materials and other constraints, planning and building genuine regional characteristics in the urban architectural form. © (2013) Trans Tech Publications, Switzerland.
Zhu X.,Anhui Institute of Architecture and Industry
Plasma Science and Technology | Year: 2010
For ion cyclotron resonance heating, the current on the antenna surface exists in a form of standing wave, and the phase of the poloidal current standing wave affects significantly on the performance of the coupling. In this paper, a coupling calculation is carried out based on a practical model for the loop antenna. The ion cyclotron wave coupling performance depends greatly on the antenna current propagation constant and the phase of standing wave. For a small antenna-current-propagation constant, the antenna coupling performance is more sensitive to a π/2 change in the phase of standing wave.
Ma Y.,Anhui Institute of Architecture and Industry
Advanced Materials Research | Year: 2012
Nanocrystalline diamond composite films were fabricated on the WC-Co substrates using a bias-enhanced hot filament CVD system. Methanol solution pretreatment method for removing the Co in surface of WC-Co substrates was put forward. The composite structure was achieved by regulating the concentration of Ar in a mixture of acetone and a hydrogen gases in different stages. The surface morphologies, nucleation density, diamond films and composition of the nanocrystalline diamond composite films were observed with different techniques. The results showed that the introduction of Ar increased the second nucleation of diamond grains which made the diamond grains finer. Nanocrystallie diamond film can be successfully grown on the microcrystalline diamond films. The two-layer structure has the advantages of good adhesive strength and low surface roughness. Because of nano effects, the hardness of composite films decreases. This is prone to be polished and reduces the work load significantly. It is of great importance for the wide application of diamond films in the precision machining fields. © (2012) Trans Tech Publications, Switzerland.
Chen J.,Anhui Institute of Architecture and Industry
Advanced Materials Research | Year: 2011
A relay feedback identification auto-tuning PID/PI is proposed in this paper which is capable of controlling long time-delay processes. The real process is approximated via FOPDT or SOPDT models, whose parameters are specified through a modified relay feedback identification method. Applying zero-pole cancellation principle, the PID/PI is tuned according to the specified amplitude and phase margins. Model identification and controller parameter tuning are done on-line without much influence on the normal operation. © (2011) Trans Tech Publications.
Zhao Q.,Anhui Institute of Architecture and Industry
2011 International Conference on Consumer Electronics, Communications and Networks, CECNet 2011 - Proceedings | Year: 2011
Taking an engineering design case about the dynamic model updating of long-span bridge under environment excitation, the three dynamic calculating models of the cable-stayed bridge are created by the finite element analysis program ANSYS, and the dynamic characteristics were analyzed, further by experimental results carried out on three models optimized amendment. The analysis results show that according to long-span bridge modal field measurement data, combined with the finite model updating method based on optimization design principle, the dynamic model of long-span bridge can get well. This method is effective and practical to amend the better, for bridge structural health monitoring, damage identification and condition assessment study provides a more reliable finite element model. © 2011 IEEE.
Wang F.,Anhui Institute of Architecture and Industry
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2012
The concept of the "free radical" is not grasped deeply and wholly by many students and discussed in detail from its intension and extension due to students have doubt on it. Considerations of authors and descriptions of the concept of the "free radical" in the courses of «Organic Chemistry» and «Physical Chemistry», are used to widely explain. In general, it is not enough to understand the concept of the "free radical" by giving out "one sentence or paragraph" definition. We can get more deeply and rich acknowledgement by understanding of its properties and its behaviors.
Zhao Q.,Anhui Institute of Architecture and Industry |
Cao T.,Anhui Institute of Architecture and Industry
Industrial and Engineering Chemistry Research | Year: 2012
Polyacrylonitrile/silica nanospheres with three-dimensional interpenetrating network structure have been synthesized via emulsion polymerization method using 0.08 g azobisisbutyronitrile (AIBN) as initiator, 5 g acrylonitrile, and 5 g γ-methacryloxypropyl trimethoxy silane as monomer, 0.85 g dodecylbenzene sulfate as emulsifier at 60 °C for 10 h. The composition and morphology of the obtained nanospheres were investigated by infrared spectrum, thermogravimetric analysis, and scanning electron microscopy, respectively. The obtained polyacrylonitrile/silica nanospheres were used to investigate adsorption Pb(II) from aqueous solutions. The research results display that composite material has high adsorption capacity at optimum pH = 5. The maximum adsorption capacity was 0.108 mmol/g within 300 min at 25 °C. The pseudo-first-order equation and the pseudo-second-order equation are applied to analyze the experimental data. Adsorption behavior for Pb(II) onto nanospheres belongs to the pseudo-second-order kinetic model, and the adsorption process is a chemical process. © 2012 American Chemical Society.
Zhao J.,Anhui Institute of Architecture and Industry
Advanced Materials Research | Year: 2013
A Rough-Fuzzy RBF Neural Network was raised based on PSO Algorithm. In this model,gives a knowledge acquisition method that based on rough set theory,the Rough-Fuzzy RBF neural network are constructed according to the results of the knowledge acquisition,the PSO are used to optimize the network parameters.This paper take number plate for example to conduct a simulation experiment.The results shows that the model can simplify the network training sample,optimize the network structure and enhance the systems study efficiency and the precision. © (2013) Trans Tech Publications, Switzerland.