Liu X.,Hohai University |
Shi J.,Hohai University |
Hu Y.,Tianjin Cement Industry Design and Research Institute Co. |
Peng G.,Guangzhou Institute of Municipal Engineering
Waste Management | Year: 2011
A new model entitled the coupled mechanical-hydraulic-gaseous effect and biochemical degradation for municipal solid waste (MSW) is proposed to simulate and predict the MSW settlement in this study. The coupled model can be used to simulate and predict the distributions of gas and water pressure as well as total waste settlement. Model verification indicates that because of degradation, the excess pore gas pressure increases rapidly and reaches a peak value in a short time, and then it dissipates gradually. But the excess pore water pressure may not always increase at the beginning, which depends on hydraulic conductivity of MSW. Dissipation of the excess pore water pressure is slower than that of the excess pore gas pressure. A waste settlement experiment was conducted in the laboratory using a synthetic MSW. The data was used to verify the developed model, which gave satisfactory results. Based on the experimental results, a new formula is proposed to simulate biochemical degradation. © 2011 Elsevier Ltd.
Shen W.,Wuhan University of Technology |
Shan L.,Wuhan University of Technology |
Zhang T.,Tianjin Cement Industry Design and Research Institute Co. |
Ma H.,Wuhan University of Technology |
And 2 more authors.
Construction and Building Materials | Year: 2013
Developing pavement materials by using rubber aggregate is an effective approach to massively utilize waste tires. In this paper, a polymer-rubber aggregate modified porous concrete was prepared as pavement friction course material, its properties e.g. strengths, stress-strain, abrasion resistance, impact resistance and its microstructure were studied. The results indicate that the polymer-rubber aggregate modified porous concrete with the optimum replacing ratio of rubber aggregate to mineral aggregate has higher flexural strength and compressive strength than the ordinary polymer modified porous concrete with mineral aggregate; the energy absorption capacity of polymer modified porous concrete is enhanced by rubber aggregates, so the ductility, abrasion resistance, impact resistance of polymer modified porous concrete are improved remarkably by rubber aggregates; their porosity and the permeability can meet the standard of OGFC (Open-Graded Fraction Course). From the SEM observation, the interfacial transition zone between the rubber and cement paste is enhanced by the polymer, the interleaving of polymer film in the cement hydration products and the replacement of rubber particle increases its ductility and flexibility. © 2012 Elsevier Ltd. All rights reserved.
Zhu Y.,University of Jinan |
Li B.,Tianjin Cement Industry Design and Research Institute Co. |
Yin H.,University of Jinan |
Ge S.,Shandong University |
Yu J.,Shandong University
Monatshefte fur Chemie | Year: 2014
The interaction between a series of rhodanine derivatives with different substituent groups and bovine serum albumin (BSA) was studied using fluorescence quenching spectra, which showed that the type of quenching of BSA by rhodanine derivatives was static in each case. Binding constants, binding site numbers, action distances, and energy transfer efficiencies between donor (BSA) and acceptors (rhodanine derivatives) were calculated and showed that introduction of -NO2 (electron-withdrawing group) is more favorable for rhodanine-BSA interaction than that of -CH3 and -OCH3 (electron-donating groups). Finally, strength of interaction between rhodanine derivatives and BSA was simulated theoretically using quantum chemistry and showed that introduction of groups with small steric hindrance is beneficial to promote the interaction. These investigations are very important to simulate the interaction of small molecules with biomacromolecules and to synthesize drug molecules that interact with protein easily. Graphical abstract: [Figure not available: see fulltext.] © 2013 Springer-Verlag Wien.
Bian H.-M.,Harbin Institute of Technology |
Bian H.-M.,Hebei University of Technology |
Yang Y.,Harbin Institute of Technology |
Yang Y.,Tianjin Cement Industry Design and Research Institute Co. |
And 2 more authors.
Powder Technology | Year: 2012
Nanostructured Al 2O 3-13wt.%TiO 2 composite powders were successfully prepared by spray drying, heat treatment and plasma treatment. The as-prepared composite powders were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy, respectively. The tap density and flowability were measured by tap density instrument and hall flowmeter, respectively. The results showed that the minimum water content of the slurry suitable for spray drying was 47wt.%, and the corresponding spray dried powders had the maximum density and flowability. Spherical and porous powders had been obtained by spray drying technology. The sphericity of the particles and the pores in the particles were decreased after heat treatment, and the density of the powders was increased. The composite particles underwent fast liquid sintering process in high energy plasma flame. After plasma treatment, spherical powders with smooth surface were formed. The plasma treated composite particles were composed of a large number of nano-sized grains. The tap density of the spray dried powders was increased after heat treatment, and the tap density of the heat treated powders was further increased after plasma treatment. The flowability of the spray dried powders was decreased after heat treatment, and the flowability of the heat treated powders was significantly improved after plasma treatment. © 2011 Elsevier B.V.
Bian H.-M.,Harbin Institute of Technology |
Bian H.-M.,Tianjin Cement Industry Design and Research Institute Co. |
Yang Y.,Harbin Institute of Technology |
Yang Y.,Hebei University of Technology |
And 5 more authors.
Journal of Alloys and Compounds | Year: 2012
Nanostructured alumina-titania composite powders were used to prepare alumina-titania ceramics by microwave sintering and conventional pressure-less sintering. The effect of microwave sintering and conventional pressure-less sintering on densification, microstructure and properties of alumina-titania ceramics were evaluated. The results showed that the alumina-titania ceramic prepared by microwave sintering exhibited shorter sintering time, significantly enhanced densification, higher density, finer and more homogenous microstructure, higher strength, higher hardness and higher fracture toughness when compared with conventionally processed counterpart. © 2011 Elsevier Ltd. All rights reserved. All rights reserved.
Song Y.,Hebei University of Technology |
Wei L.-Y.,Tianjin Cement Industry Design and Research Institute Co. |
Ping L.,Hebei University of Technology
Applied Mechanics and Materials | Year: 2013
This passage introduced techniques of preventive maintenance that using broad at present, explained the affect factors and principles, and analysis several measures of preventive maintenance and the best time of different conduct of road. © (2013) Trans Tech Publications, Switzerland.
Dong H.,Beijing University of Technology |
Cao W.,Beijing University of Technology |
Bian J.,Tianjin Cement Industry Design and Research Institute Co. |
Zhang J.,Beijing University of Technology
Materials | Year: 2014
In order to ascertain the fire resistance performance of recycled aggregate concrete (RAC) components with different concrete compressive strengths, four full-scaled concrete columns were designed and tested under high temperature. Two of the four specimens were constructed by normal concrete with compressive strength ratings of C20 and C30, respectively, while the others were made from recycled coarse aggregate (RCA) concrete of C30 and C40, respectively. Identical constant axial forces were applied to specimens while being subjected to simulated building fire conditions in a laboratory furnace. Several parameters from the experimental results were comparatively analyzed, including the temperature change, vertical displacement, lateral deflection, fire endurance, and failure characteristics of specimens. The temperature field of specimens was simulated with ABAQUS Software (ABAQUS Inc., Provindence, RI, USA) and the results agreed quite well with those from the experiments. Results show that the rate of heat transfer from the surface to the interior of the column increases with the increase of the concrete's compressive strength for both RAC columns and normal concrete columns. Under the same initial axial force ratio, for columns with the same cross section, those with lower concrete compressive strengths demonstrate better fire resistance performance. The fire resistance performance of RAC columns is better than that of normal concrete columns, with the same concrete compressive strength. © 2014 by the authors.
Zhang J.,Tianjin University |
Qu H.,Tianjin University |
Zhang Z.,Tianjin University |
Zhou L.,Tianjin Cement Industry Design and Research Institute Co.
Acta Crystallographica Section E: Structure Reports Online | Year: 2011
In the title compound, C 30H 38O 4Si 2, the two phenyl rings are twisted away from the central benzene ring by 70.28 (8) and 67.42 (7)°. The two Si atoms attached to the benzene ring deviate in opposite directions from the ring plane by 0.258 (3) and 0.206 (3) Å, respectively. One ethyl group is disordered over two conformations in a 0.568 (5):0.432 (5) ratio. The crystal packing exhibits weak inter-molecular C - H⋯O inter-actions. © Zhang et al. 2011.
Liu J.,Tianjin University |
Li W.,Tianjin University |
Li W.,Tianjin Cement Industry Design and Research Institute Co. |
Wang B.,Tianjin University
Energy and Buildings | Year: 2010
The energy recovery ventilator (ERV) is an effective method, which can transfer heat and moisture from the exhaust air into the outdoor fresh air to save energy in buildings. Nowadays, ERV has been widely used in the commercial, industrial and residential buildings in China. Its energy saving performance depends on a lot of factors, such as the outdoor environmental conditions, the enthalpy efficiency of the exchanger, and so on. Based on the relationship among sensible heat, latent heat and enthalpy efficiency, we analyzed the weighted coefficient equations for describing the performance of ERV in different climatic zones in China. According to China weather data, enthalpy efficiency of the exchanger mainly depends on sensible heat efficiency in winter and latent heat efficiency in summer. The energy simulations of a sample apartment in a residential building were made under different operation conditions to study the performance of ERV. The energy saving performances of the ERV were studied with five different outdoor climatic conditions, the enthalpy efficiency, fan power consumption of ERV and fresh air change rate. To improve energy saving performance, better efficient enthalpy exchange material and higher effiencient fans must be explored, while reasonable fresh air change rate as well as proper operation period according to local climate should also be carefully considered. © 2009 Elsevier B.V. All rights reserved.
Ni S.-Q.,Shandong University |
Ni J.-Y.,Shandong University |
Hu D.-L.,Tianjin Cement Industry Design and Research Institute Co. |
Sung S.,Iowa State University
Bioresource Technology | Year: 2012
The presence of organic matter (OM) is considered to affect anammox process adversely, while practically wastewaters containing ammonia are not free from OM. In this study, the performance of anammox granules in presence of OM was evaluated under different COD to N ratios. Low OM concentration did not affect ammonia and nitrite removal significantly but improved the total nitrogen removal via denitrifiers. High OM could suppress anammox activity, resulting in a lower ammonia removal. PCR tests revealed that there was a reduction in the number of anammox bacteria and denitrifiers quantity increased when 400. mg COD/L influent was applied. A COD to N threshold ratio for anammox inhibition, defined when ammonia removal dropped to 80%, was 3.1, higher than that of flocculent sludge. This study revealed that the coexistence of denitrification and anammox was an effective strategy to treat wastewaters containing high levels of nitrogen and OM. © 2012 Elsevier Ltd.