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Sorption of a triazol derivative by soils: importance of surface acidity

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Journal of Environmental Sciences 2003年第3期15卷 383-387页

作者： WU De-yi (school of Environmental Science and engineering, {2. Jiaotong university, {2. 2.02.0, china.) school of Environmental Science and engineering Shanghai Jiaotong University 上海 200240

The sorption of a triazol derivative, 1-(4-chlorophenyl)- 4,4-dimethyl-2.(1H-1,2.4-triazol-1-yl)penten-3-ol with a common name of S3307D, on fifteen soils and three H_2._2.treated soils was investigated. The sorption isotherm for each untreated and treated soil was non-linear, and was best fitted to Freundlich sorption equation. Soils containing high amount of clay content or organic matter or both sorbed much higher amounts of the chemical than soils that had low contents of these soil constituents. H_2._2.treated soils showed considerable sorptive affinity for S3307D. It was concluded that both organic matter and mineral fraction in natural soils contributed to the sorption of the basic compound. Sorption by the H_2._2.treated soils increased as suspension pH decreased, but all suspension pHs exceeded the pKa of the compound by more than two units. This implies that organic base protonation can occur on surfaces of soil components, and surface acidity (exchangeable acidity ) is important in sorption process of the organic base rather than suspension pH.

关键词： sorption organic base soil surface acidity

A Resistivity Gradient Piezoelectric FGM Actuator

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Journal of Materials Science & Technology 2000年第4期16卷 383-386页

作者： S. U.Adikary and Zhongyan MENG (school of Materials Science and engineering, {2. university, {2. 2.1800, china) Dengren JIN (school of Materials Science and engineering, {2. Jiaotong university, {2. 2.0030, china) school of Materials Science and engineering Shanghai University Shanghai 201800 China school of Materials Science and engineering Shanghai Jiaotong University Shanghai 200030 China

A resistivity gradient actuator based on lead zirconate titanate ceramics was successfully developed and the bending deflections up to 140 μm were obtained. The actuator material was a matrix of PZT ceramic into which smooth gradient of piezoelectric activity was introduced. The application of an electric field then causes the actuator to bend due to differential strains induced by the piezoelectric effect. The resistivity gradient of the actuator was achieved by doping PZT with suitable donor and acceptor dopants. PZT powder was modified and synthesized by using two stage powder fabrication method. The actuator was fabricated by uniaxial pressing followedby isostatic pressing with two layers of different resistivities.

关键词： PZT FGM

Unified solutions for stresses and displacements around circular tunnels using the Unified Strength Theory

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Science china(Technological Sciences) 2010年第6期53卷 1694-1699页

作者： ZHANG ChangGuang1,WANG JiangFeng2.& ZHAO JunHai3 1 Department of Geotechnical engineering,tongji university,{2. 2.North china Institute of Water Conservancy and Hydroelectric Power,Zhengzhou 450011,china 3 school of Civil engineering,Chang’an university,Xi’an 710061,china Department of Geotechnical engineering Tongji University Shanghai China North china Institute of Water Conservancy and Hydroelectric Power Zhengzhou China school of Civil engineering Chang’an University Xi’an China

The unified solutions are presented for stresses and displacements around a circular tunnel subjected to a hydrostatic stress *** rock mass is assumed to be elastic-brittle-plastic and governed by the Unified Strength *** displacements are obtained accounting for three different definitions for elastic strains and different Young's modulus in the plastic *** unified solutions obtained in this paper are especially versatile in reflecting the intermediate principal stress effect to different extents for different *** conventional solutions,based on the Mohr-Coulomb failure criterion and the Generalized Twin Shear Stress yield criterion,are special cases of the present unified *** new unified solutions can compare with those computed by the latest generalized Hoek-Brown failure *** results obtained demonstrate the importance of the intermediate principal stress influence for the stresses and displacements *** effects of different definitions for elastic strains and different Young's modulus in the plastic zone on the displacements are significant.

关键词： Unified Strength Theory intermediate principal stress different definitions for elastic strains different Young’s modulus

Effect of Cold Rolling on Microstructure and Mechanical Properties of AISI 301LN Metastable Austenitic Stainless Steels

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Journal of Iron and Steel Research International 2012年第10期19卷 59-63页

作者： HUANG Jun-xia1, YE Xiao-ning1, XU Zhou2.(1. shanghai Baosteel Research Institute, shanghai 2.0431, {2. 2. school of Material Science and engineering, shanghai Jiao Tong university, shanghai 2.02.0, {2.) shanghai Baosteel Research Institute Shanghai China school of Material Science and engineering Shanghai Iiao Tong University Shanghai China

The microstructure and mechanical properties evolution of AISI 301LN metastable austenitic stainless steels during cold rolling were investigated. A wide range of cold thickness reduction (10%-80%) was carried out in a four-high rolling mill at ambient temperature. The X-ray and Feritscope MP30 were used to identify the strain-induced α′-martensite phase and its volume fraction, respectively. The microstructure was observed by optical micrograph and the mechanical properties were determined by tensile tests and microhardness. The results show that the strain-induced α′-martensite nucleated at the shear bands intersections and the growth of α′-martensite occurred by the repeated nucleation of new embryos. The volume fraction of strain-induced α′-martensite increased with increasing the cold rolling reduction. In addition, the percentage increased in the tensile strength is the same as that of hardness. The ratio between the average tensile strength and the average microhardness was found to range between 2.82.and 3.17.

关键词： metastable austenitic stainless steel cold rolling reduction strength

Tribological Properties of PVA-H Composites Reinforced by Nano-HA Particles

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Journal of Wuhan university of Technology(Materials Science) 2007年第3期22卷 490-493页

作者：吴刚 school of Mechanical engineering Shanghai Jiaotong University

The friction and wear behaviors of tribological mechanical components were studied on a four-ball tester under dry conditions, and the wear mechanism was analyzed by observed worn surface using a scanning electron microscope （SEM）. It was found that the friction and wear properties were improved by the addition ofnano HA particles. The composite containing 1 wt% nano HA had the optimum friction coefficient. It is also found that the addition of nano HA increases the wear resistance of oure PVA-H and PVA-H composites.

关键词： articular cartilage composites wear friction coefficient corrosion-abrasion

THE INVESTIGATION ON THE RHEOLOGICAL BEHAVIOR OF SEMI-SOLID ALUMINUM ALLOY DURING DIE CASTING

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Acta Metallurgica Sinica(English Letters) 2002年第6期15卷 511-516页

作者： X.J. Yang and J.Liu school of Mechanic & Electronic engineering, Nanchang {2., Jiangxi 33002., china school of Mechanic & Electronic engineering, shanghai {2., shanghai 2.0072. china Sch. of Mech. and Electron. Eng. Nanchang Univ. Nanchang 330029 China Sch. of Mech. and Electron. Eng. Shanghai Univ. Shanghai 200072 China

Under the condition of die casting and reheating temperature of 570-580 degC, the rheological behavior of semi-solid aluminum alloy (A356) is pseudoplasticity at the shearrate of 2.10^-1X10^4s^(-1), and also shows dil... 详细信息

关键词： shear rate apparent viscosity viscosity model thixocasting

Effect of Curing Regime on Bonding Strength of EVA Modified Mortar to Tile

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Journal of Wuhan university of Technology(Materials Science) 2010年第2期25卷 346-348页

作者：何代华 school of Materials Science & engineering University of Shanghai for Science Technology Key Laboratory of Advanced Civil engineering Materials Ministry of Education Tongji University

Ethylene-Vinyl Acetate （EVA） redispersible powder and latex were used to modify mortar. Three kinds of curing regimes： standard curing, high temperature curing and freeze-thaw circle curing were adopted to cure the bonded samples. Bonding strength of EVA modified mortar was tested at 2. days. The development of bonding strengths under all three curing regimes were discussed and compared. The experimental results show that bonding strength increases with the increase of EVA content in mortar. The curing regime used within 2. days is critical according to the bonding strengths values under three curing regimes for different ages. The reasons of that the EVA can improve the bonding strength were analyzed.

关键词： EVA redispersible powder latex bonding strength curing regime

Mechanisms of antiprostate cancer by gum mastic:NF-κB signal as target

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Acta Pharmacologica Sinica 2007年第3期28卷 446-452页

作者： Mei-lan HE~(2.4) Ang LI~2.Chun-su XU~2.Shun-li WANG~3 Meng-jie ZHANG~2.Hua GU~2.Yao-qin YANG~3 Hui-hong TAO~3 ~2.nstitute of Cancer Research,Life Science and Technology school,tongji university,{2. ~3Cellular Morphology Center,Medical school,tongji university,{2. Institute of Cancer Research Life Science and Technology School Tongji University Shanghai China Cellular Morphology Center Medical School Tongji University Shanghai China

Aim:To study the effect of gum mastic,a natural resin,on the proliferation ofandrogen-independent prostate cancer PC-3 cells,and further investigate themechanisms involved in this regulatory system,taking nuclear factor κB(NF-κB)signal as the ***:3-(4,5-dimethylthiazol-2.yl)-2.5-diphenyltetrazoliumbromide(MTT)assay and a flow cytometer were used to detect the effect of gummastic on the proliferation of PC-3 ***,reporter gene assay,RT-PCR,andWestern blotting were carried out to study the effects of gum mastic on the NF-κBprotein level and the NF-κB signal *** expression of genes involved inthe NF-κB signal pathway,including cyclin D1,inhibitors of κBs(IκBα),andphosphorylated Akt(p-AKT),were *** addition,transient transfectionassays with the 5×NF-κB consensus sequence promoter was also used to test theeffects of gum ***:Gum mastic inhibited PC-3 cell growth and blockedthe PC-3 cell cycle in the G1 *** mastic also suppressed NF-κB activity inthe PC-3 *** expression of cyclin D1,a crucial cell cycle regulator and anNF-κB downstream target gene,was reduced as ***,gum masticdecreased the p-AKT protein level and increased the IκBα protein ***:Gum mastic inhibited the proliferation and blocked the cell cycleprogression in PC-3 cells by suppressing NF-κB activity and the NF-κB signalpathway.

关键词： gum mastic prostate cancer NF-κB signal

Sulfonic Acid Modified Hollow Silica Spheres and Its Application in Proton Exchange Membranes

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Journal of Wuhan university of Technology(Materials Science) 2011年第5期26卷 837-842页

作者：朱敏袁俊杰 school of Materials Science and engineering Tongji University Key Laboratory of Advanced Civil engineering Materials Minstry of EduationTongji University

In order to improve the proton conductivity of hollow silica spheres （HSS）/perfluorosulfonic acid ion-exchange （PFSA） composite membranes as proton exchange membrane,sulfonic acid groups were grafted onto the surfaces of HSS via post grafting *** images and FT-IR spectra of the obtained sulfonic acid groups modified hollow silica spheres （SAMHSS） illustrated that the sulfonic acid groups were successfully grafted onto the surfaces of *** uptake and swelling degree of SAMHSS/PFSA composite membranes were found much higher than those of HSS/PFSA membranes due to the introduction of hydrophilic sulfonic acid *** a range from 50 ℃ to 130 ℃,the highest conductivity of composite membranes was obtained when 5 wt% SAMHSS was *** maximum conductivity reached 7.5×10-2.S·cm-1 at 100 ℃ and 100% relative humidity,even the temperature increased to 130 ℃,the conductivity of composite membranes with 5 wt% SAMHSS could reach 3.7×10-2.S·cm-1 at 100 % relative humidity,while the conductivity of the recast PFSA was only 2.2.10-3 S·cm-1.

关键词： composite hollow silica spheres proton exchange membrane sulfonation conductivity