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Online since: August 2011
Authors: Shuang Jin Liu, Li Chen Zhao, Xun Yao, Fen Fei Cai, Chun Xiang Cui
Currently, the design methods used in the field of titanium alloys are discrete variational cluster method, d-electron alloy design method, alloy design method based on fuzzy-logic, and neural network technology, etc.The titanium-based alloys for biomedical applications usually involve complex multi-component chemistries and often exhibit intricate multi-phase microstructures.
Determination of the amount of elements by d-electron alloy design method D-electron alloy design method also means NEW PHACOMP, phase computation, is based on the theoretical calculation of the electronic structures of titanium alloys by the discrete-variational (DV) Xa cluster method.
Fig.2 SEM images of Ti-25Nb-2Mo-4Zr after different heat treatment (a) solid solution treatment at 700˚{TTP}730 C for 0.5 h (b) aging treatment at 500˚{TTP}730 C for 2 h Fig.3 and Fig.4 show the analysis results of phase structure of Ti-25Nb-2Mo-4Zr alloy after solid solution and aging treatment.
Online since: January 2011
Authors: Mariana Lucaci, Radu Liviu Orban, Nicolaie Jumate, Dana Salomie
The most appropriate method to obtain this FeTi–Al-Ni alloy in a nanocrystalline state seems to be its mechano-synthesis from components by Reactive Mechanical Alloying (RMA) and by its structure further refining by Mechanical Disordering (MD).
As can be seen, for 24 h (RMA+MD), a nanocrystalline structure has been really formed.
[4] G Walker: Solid-state hydrogen storage: Materials & chemistry, Woodhead pbl, U.K. 2008
Online since: June 2014
Authors: Zhen Wu, Lei Hu, Ning Xu, Ben Lin Dai, Jia Xing Xu
Enzymatic hydrolysis lignin oxidation to prepare aromatic aldehydes with activation of Fenton reagent Zhen Wu1,2,*, Ning Xu1,2, Lei Hu1,2, Benlin Dai1,2, Jiaxing Xu1,2 1Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology, Huaiyin Normal University, Huaian,223300,Jiangsu Province,China 2School of Chemistry and Chemical Engineering,Huaiyin Normal University, Huaian,223300,Jiangsu Province,China *Corresponding author’s e-mail: scutwuzhen@126.com Key words : enzymatic hydrolysis lignin; aromatic aldehydes; activation; Fenton reagent Abstract: Enzymatic hydrolysis lignin was prepared and used to converse into aromatic aldehydes by catalytic wet oxidation with activation of Fenton reagent.
Introduction Biomass can serve as a sustainable source of renewable fuels and chemicals to meet the growing demand for energy due to the particularity of its chemical structure.
Lignin is an extremely complex three-dimensional macromolecule with irregular structure, which results from random dehydrogenative polymerization of phenylpropane building units, including coniferylic, sinapylic and p-coumarylic alcohols[2,3].
Online since: December 2012
Authors: Cheng Wen Liu
The structure of the sensor with two pole When the exciting coil connection has certain frequency alternating current, and then the alternating flux will be generated in the excitation magnetic pole, its mobility status as shown in Fig. 1.the alternating flux can be calculated by (2) In (1), I represent the field current; N1 represent the number of turns of the excitation coil; φ represent the alternating flux in magnetic circuit; RL represent the magnetic resistance in magnetic core; Re represent the magnetic resistance in measured the material surface where the magnetic line of force has permeate ; R0 is the magnetic resistance in magnet gap; According to the magnetostriction effect if the saturation the magnetostriction coefficient λS of the ferromagnetic materials acted by tensile stress is bigger than the zero,its magnetic conductivity will increased, and its
The result indicated when the exciting current frequency is higher, the magnetic survey gap is smaller, and the measurement sensitivity is higher. 6 Conclusions The test indicated that the use of amorphous alloy for stress measurement is feasible, it has the following characteristics: 1) Having high measurement sensitivity, it is suitable for small components used in measuring deformation; 2)Its structure is simple and easy to handle; 3)Its mechanical strength is high, and it is good in the anti-chemistry; 4)It is easy to realize non-contact stress measurement and online testing; 5)It is insensitive to the temperature change; 6)It paste process complex and require a high degree of bonding adhesive. .
Online since: June 2014
Authors: Edson Jansen Pedrosa Miranda Jr., M.M. Oliveira, Ermerson Ney Leite Rodrigues
Oliveira3,c 1,2 Department of Mechanics and Materials – DMM – IFMA – Brazil 3 Department of Chemistry – DAQ – IFMA – Brazil aermerson.rodrigues@ifma.edu.br, bedson.jansen@ifma.edu.br, cmarcelo@ifma.edu.br, Keywords: Pechini method, nanoparticles, zirconia, silver, bactericide.
Ceramic material is traditionally used in gravity filters because it lends itself easily to the creation of a uniform structure of small pores.
These ceramic structures can remove many contaminants from water, be exclusion according to pore size or by adherence to the pore walls.
Online since: October 2014
Authors: Tian Ying Xiong, Yan Fang Shen, Wan Song, Xin Yu Cui
The coating presented a rough surface and porous structure.
Two types of pure anatase crystalline structure were studied.
The adhesion strength of TiO2 coatings could be improved by changing the surface chemistry of the substrates.
Online since: October 2010
Authors: Alexandre Maître, Olivier Preziosa, Guillaume Di Vita, Sylvie Foucaud, A. Denoirjean, C. Barthélémy
Consequently, as the curve in Figure 1 shows a mass gain, the structure of the coating may have tended to a more stoichiometric one.
Those variations in the crystalline structure imply stress relaxation and may explain the large cracks observed in Figure 4b. 5.
Reddy: Materials Chemistry and Physics Vol. 76 (2002), p. 78 [4] E.
Online since: July 2012
Authors: A.M. Mustafa Al Bakri, Ismail Khairul Nizar, A.R. Rafiza, H. Kamarudin, D. Hardjito
However the particle of mud (Fig. 1a) has a plate-like structure or flake-shaped particles similar to clay.
XRD analysis shows the minor crystalline structure such as quartz, feldspars, and kaolinite.
Chemistry of Geopolymeric Systems.
Online since: July 2012
Authors: Da Feng Zheng, Xue Qing Qiu, Dong Jie Yang, Xiao Hong Sun, Yan Lin Qin, Hong Ming Lou
The Adsorption and Dispersion Performance of Superplasticizers on Cement Particles Zheng Dafenga,b, Qiu Xueqinga,*, Sun Xiaohonga, Qin Yanlina , Lou Hongminga, Yang Dongjiea a State Key Lab of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P R China b The Guangdong Provincial Engineering Research Center of Green Fine Chemicals,China E-mail: cexqqiu@scut.edu.cn Keywords: superplasticizer; adsorption; electrostatic repulsive force; steric repulsive force; dispersion effect Abstract: The adsorption of two superplasticizers, SNF and CE, on the cement particles were investigated.
Results and discussion Adsorption isotherm of superplasticizer on the surface of cement particles With different structure and basic groups, the adsorption capacity of different superplasticizer is various.
The effect of different superplasticizer on the ζ potential is different for the molecular structure and groups.
Online since: May 2011
Authors: Si Qun Wang, Kun Liang, Omid Hosseinaei, Hui Wang, Guan Ben Du
And the compositions and composite structure are different between them.
Because their basic compositions and structure are different, the penetrability of adhesive may be different between them.
The different phnomenon may be explained by the difference constructure and chemistry.