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Online since: January 2012
Authors: Xing Hua Liang, Tian Jiao Liu, Xiao Ming Hua
The weld metal chemistry is affected by the electrochemical reaction at the weld pool flux interface.
However, as compared with that agglomerated and sintered fluxes, the fused fluxes have some excellent characterization, such as good recycling utilization, pure glass state structure, excellent arc-stability.
According to the Fig.2a and Fig.3a, it can be observed that two fluxes are diamond glassy structure, particle size of flux A larger than that of flux B.
Two fluxes are diamond glassy structure, particle size of flux A larger than that of flux B. both the fused flux of this work are amorphous phases structure.
Online since: August 2014
Authors: Mi Liu
As the main structure of modern industrial buildings, the concrete mixing analysis for the concrete buildings has important guide meanings for the area.
The concrete is a kindle of complex building materials and different design forms will lead the stress analysis in the concrete structure are completely different.
The fuzzy neural network structure is described in Fig. 1.
Fig. 1 The fuzzy neural network structure The following equations can be used to describe the input data
Computer and applied chemistry, 2012.7:881-884
Online since: April 2007
Authors: Ya Lu Ma, Hong Long Zhu, Yu Zhang
Preparation and Characterization of ZrO2 Microspheres by Internal Gelation Process Hong-long Zhu, Ya-lu Ma and Yu Zhang Department of Chemistry, Institute of Science, Tianjin University, Tianjin 300072, China Keywords: Zirconia, Internal gelation process, Ceramic microspheres Abstract.
Fig.4 TG-DTA curves of samples (a) TZP structure (b) PSZ structure Fig.5 Optical micrograph of calcined samples Fig.6 The SEM micrographs of ZrO2 microspheres stabilized with Y2O3 and/or MgO Calcining.
Fig.6(a) shows typical TZP structure.
Fig.6(b) shows typical PSZ structure with particle size of 4~5um.
Online since: August 2007
Authors: Rong Tu, Takashi Goto, Nittaya Keawprak
However, SrRuO3 and CaRuO3 have different magnetic and electric properties that could be related to the crystal structure.
The crystal structure of CaRuO3 and SrRuO3 belong to othorombic distorted GdFeO3 type with Pnma and Pbnm space group, respectively. [1] CaRuO3 distorted more significant than SrRuO3. [1,2] There have been no study on the property of CaRuO3 sintered bulk body although a few researchers have studied the electrical property of CaRuO3 thin films. [3-5] Scotti di Uccio et al. [4] prepared CaRuO3 films by sputtering and reported that the unit cell volume increased with increasing the Ca/Ru ratio, and the electrical conductivity decreased with increasing the unit cell volume.
In the present study, CaRuO3 dense body was prepared by SPS and the effect of the Ru to Ca ratio on the crystal structure, microstructure and density were investigated.
The crystal structure and lattice parameters were examined by powder X-ray diffraction.
Physics and Chemistry of Solids Vol. 62 (2001), p. 797 [2] H.
Online since: January 2013
Authors: Fei Liu, Xiao Dan Wang, Peng Long Ye, Jian Xin Cao, Ting Li, Duan Hua Guo
Effect of Fe loading Content on Catalytic Performance of ZSM-5 for the IMTO Process Fei Liu1, a, Ting Li1, Penglong Ye1, Xiaodan Wang, Jianxin Cao1, b and Duanhua Guo2 1School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550003, China 2Guizhou Chitianhua Cooperation, Limited Liability Company ace.feiliu@gzu.edu.cn, bjxcao@gzu.edu.cn Keywords: ZSM-5; modified; iodide method; olefins.
According to the structure characteristics of methanol molecules, this paper proposed to convert methanol to olefin with iodide method (IMTO).
Therefore, this study is devoted to investigating the influences of different Fe contents modified ZSM-5 zeolite that acted as catalyst B on the catalytic performance for IMTO process, meanwhile, characterizing the microstructure and pore structure of ZSM-5 zeolites modified with different contents of Fe loadings. 2 Experimental The Fe-ZSM-5 zeolites were prepared with impregnation method.
Properties of ZSM-5 pore structure before and after modified with Fe element Fe loading content [%] BET surface area [m2·g-1] pore volume [cm3·g-1] average pore diameter [nm] 0.0 339.249 0.253 1.909 3.0 308.115 0.247 1.691 6.0 287.744 0.240 1.432 9.0 279.361 0.234 1.368 12.0 284.756 0.230 1.411 The pore structure properties of ZSM-5 before and after modified by Fe element are shown in Table.1.
Online since: February 2011
Authors: Zhang Fa Tong, Qing Ruo Xie, Yi Sun, Li Wen Zheng, Hu Qi Wang
Finite Element Analysis of the Stress on Cylinder of the Fluidized Bed Reactor for Fast Pyrolysis Qingruo Xie1, 2,a, Yi Sun1, Liwen Zheng2, Huqi Wang2, Zhangfa Tong1, b, 1School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China 2Depart of Biology and Chemical Engineering, Guangxi University of Technology, Liuzhou 545006, China ahuagong104@163. com, bdean@gxu. edu. cn Keyword: Finite Element; Stress; Reactor; Fast Pyrolysis Abstract: A new experimental fluidized bed reactor was investigated and designed which has been widely utilized for fast pyrolysis under different temperatures (T=727–973 K).
The cylinder is the basic structure of ultra-high temperature reactor.
Finding the constant stress range at which the cylinder with least damage to cylinder structures (i.e. creating less bending stresses) has constituted the main object of the our investigation.
The results show the stress fluctuation phenomenon due to discontinuous structure of cylinder appears in nearby both ends of cylinder.
Due to discontinuous structure, the stress fluctuation phenomenon is obvious which position of the fluctuation appears in nearby both ends of cylinder.
Online since: May 2013
Authors: Hardev Singh Virk
After three days, a precipitate appeared with porous, flower-like structures.
Mendez, Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry, 39 (2009) 662-684
Menon, Effect of Vacuum Annealing on the Optoelectric and Morphological Properties of F16CuPc Thin Films, E-Journal of Chemistry 9(1) (2012) 294-300, http://www.e-journals.net
Virk, Fabrication and characterization of metallic Copper and Copper Oxide nanoflowers, Pakistan J. of Chemistry 1(4) (2011) 1-7
Li, Shape-controlled synthesis of ZnO nano- and micro-structures.
Online since: December 2016
Authors: Gundars Mezinskis, Anzelms Zukuls
Structure and Hydrophobicity of Fe2O3-TiO2 Coatings Anzelms Zukuls a * and Gundars Mezinskisb Institute of Silicate Materials, Faculty of Material Science and Applied Chemistry, Riga Technical University, Paula Valdena Street 3/7, LV-1048 aanzelms.zukuls@gmail.com, bgundarsm@ktf.rtu.lv Keywords: Fe2O3–TiO2, Sol–gel, Hydrophobicity, Thin film.
SEM and AFM observations revealed leaf-like structure formation on a coating surface.
Fig. 3 shows SEM micrographs of Fe2O3–TiO2 film containing 65 mol% Fe2O3 structure on glass slide substrate.
However, less porous and homogeneous structure could be obtained by changing viscosity of the solutions – by adding distilled water (lowering viscosity) films were more homogenous.
Burda, Size and structure effect on optical transitions of iron oxide nanocrystals, Phys.
Online since: October 2012
Authors: S.G. Gaurkhede, M.M. Khandpekar, S.P. Pati, A.T. Singh
Currently research on nanophosphors is a dominant field in modern material chemistry.
SEM images have been obtained using ZEISS ULTRA FESEM, with accelerating voltage from 0.1kv to 30kv at beam current up to 100nA, resolution 0.8 nm at 30 KV, magnification 10x to 1000kx and image structure down to 10 nm size.
The results of the XRD are in good agreement with the hexagonal LaF3 structure as described in the reports LaF3 (JCPDS card No. 32-0483) [15].
Three strong diffraction rings corresponding to the (002), (111) and (300) reflections, have been observed which is in close agreement with the hexagonal LaF3 structure [18].
This shows that the original structure of LaF3 may be retained even after modification.
Online since: July 2012
Authors: Than Than Win, Htet Htet Nwe, Yin Maung Maung, Ko Ko Kyaw Soe
Non-Volatile Memory Behaviour of MFIS Structure with Ba0.7Sr0.3TiO3 Films for Memory Capacitor Application Htet Htet Nwe1, a, Yin Maung Maung2,b , Than Than Win3,c and Ko Ko Kyaw Soe4,d 1Department of Physics, Dagon University, Yangon, Myanmar 2Department of Physics, University of Yangon, Yangon, Myanmar 3Department of Physics, University of Yangon, Yangon, Myanmar 4University of Yangon, Yangon, Myanmar ahtet2nwe@gmail.com, bdryinmgmg@gmail.com, cthannthannwinn@gmail.com, ddrkokokyawsoe@gmail.com Keywords: Barium Strontium Titanate, MFIS, Dielectric, P-E hysteresis loop Abstract.
Morphological changes on BST/SiO2/Si structures observed by SEM and surface micrograph of the films were shown in Fig.1(a-c).
SEM micrographs of BST films revealed that the alternating sol chemistry was quite feasible for thin film manufacture.
The exact and crowded spherical smooth grain BST films were detected for MFIS structure.
It was also predicted that the BST film of MFIS structure was of integrity and non-cracking.