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Online since: December 2019
Authors: Ruslan V. Lesovik, Sergey V. Biryukov, Alexander E. Fomin, E.S. Glagolev
High pozzolan activity of WMC tails, which consists in genetic and morphological features of the surface of poly-mineral structures has been established.
These defects presence leads to a higher degree of structure disorder.
In this case, the effect on the structure imperfection has the mechanical action conditions.
With an increase in the duration of mechanical activation, its structure increases defectiveness, which facilitates the diffusion of Ca 2+ ions deep into the layer.
[23] R Ailer, Chemistry of silica, Mir, Moscow, 1982
Online since: September 2016
Authors: Dmitriy Simonov, Natalia A. Mitina, Alexander A. Ditts, Inna B. Revva
The paper presents a study of structure formation during the hardening of a new water resistant hydraulic magnesium cement.
The structure of new growth and surface morphology of the samples was studied using a JEOL 6000 scanning electron microscope.
The structure of magnesium cement with a solution of magnesium bicarbonate: a) 1 hour of hydration; b) 12 hours of hydration.
Perminov, Features of the Influence of Sol Additives of Iron Hydroxide on the Structure and Properties of Magnesia Stone, J. of the S.
Shand, The Chemistry and Technology of Magnesia.
Online since: June 2011
Authors: Qiu Guo Xiao, Gang Cheng Ding, Tang Zhong Long, Shao Hua Shen
Application of High Temperature Quantitative X-Ray Powder Diffraction on determination of ternary system Qiuguo Xiaoa, Gangcheng Ding, Peng Long, and Shaohua Shen School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, China.
However, in the high-temperature RQA analysis, the selected crystal structure models which are often the room-temperature crystal structures are just to be used as Table 1.
Parameters Conventional RQA High-temperature RQA Background Refined Refined Zero point shift Refined Refined Scale factor and phase fraction Refined Refined Isotropic temperature factor Fixed Refined Lattice parameter Fixed Refined Preferred orientation Refined Refined Peak profile parameter Refined Refined Absorption factor Fixed Refined the initial models of the high-temperature crystal structure.
In fact, therefore, the primary procedure of the high-temperature RQA is the multiphase structural refinement, in which the lattice parameters and the temperature factors of the atoms in the structure have been changed at high temperature and finally the weight fraction as well as the phase fraction of each phase is a concomitant with the refinement results.
Online since: July 2012
Authors: Ting Wang
Structure model for horse spleen ferritin.
These supramolecular structures represent novel reaction vessels for the synthesis of inorganic materials with controlled dimensions.
Being zero dimensional, the obtained NPs have a sharper density of states than higher-dimensional structures.
Interestingly, apoferritin, CoII-apoferritin exhibited identical chromatography elution profiles, indicating that the structure of the protein remained intact after CoII loading.
[5] N.Gálvez, P.Sánchez, J.M.Dom´ ınguez-Vera, The Royal Society of Chemistry (2005) 2492-2494 [6] T.
Online since: June 2010
Authors: Dong Fang Li, Li Li, Jin Chi Zhou
The basic principle of Infrared Reflectance (IR) spectroscopy is that when the infrared rays the being tested materials, the molecular structure of the organic compounds are determined by detecting the strength of light which be absorbed or passed through the materials [4].
Yi-heng Lu [25] revealed that methyl stannum mercaptide begins to thermal decompose at 120℃ by using mass spectroscopy and IR spectroscopy to identify its structure.
Chang-sheng Yang [27] claimed that wood powder polyether and polyether have the same group structure by the IR spectroscopy analysis.
And Meder [29] revealed that the IR spectroscopy can be used to foresee the improvement the structure of laminated veneer lumber (LVL).
Chen: Chemistry and Industry of Forest Products.
Online since: November 2012
Authors: Arvind Kumar, Vijayeta Pal, R.K Dwivedi
The complex impedance analysis is a very useful tool to study defect, microstructure, surface chemistry and electrical conductivity for material including dielectrics, ionic conductor, and adsorbate – adsorbent interface [7].
The crystalline structure of the sintered samples was examined using X-ray diffraction (XRD) analysis with Cu-Kα radiation (DX-1000).
The composition with x = 0.02 has been found to have tetragonal structure and with x ≥ 0.10 have been found to have cubic structure.
Sinha, Dielectric relaxation and electronic structure of Ca(Fe1∕2Sb1∕2)O3 Phys.
Online since: September 2013
Authors: You Tong Zhang, Gaoussou Hadia Fofana
Lithium-ion Battery Structure and Model Analysis This paper used a simple lithium-ion battery examined to analysis thermal management of Li-ion batteries.
(a) Multi-folded-layer structure of a prismatic cell (b) Sectional view of X-ray pictures showing battery layers in the cell [4].
(a) Li-ion battery actual model in lab (b) Illustration of the structure of a single battery layer in a Li-ion cell.
For Li-ion battery cells, its electrical behavior is characterized with the cell voltage potentiel and the cell internal resistance (5) where and are parameters related to the cell chemistry. , is heat flux, indicates temperature in the direction of some surfaces[10].
As for prismatic cells, all is rectangular structure and must consider different temperature across the cell thickness in FEA models in ANSYS.
Online since: April 2013
Authors: Xin Zhu Li, Ji Shi Zhang
Cr-substituted mesoporous aluminophosphate molecular sieve: Synthesis, characterization, crystallization kinetics and catalytic activity Xinzhu Li1,2,a, Jishi Zhang 3,b 1Institute of Chemistry & Technology, Nanjing University of Science & Technology, Nanjing 210094, China; 2National Slow/Controlled Release Fertilizer Research Center, Linshu 276700, China; 3 Department of Environment, Shandong Polytechnic University, Jinan 250353,China alixinzhu@126.com, blyzhangjishi@163.com Key words: Mesoporous aluminophosphate molecular sieve; Chromium; Characterization; Crystallization kinetics; Catalytic activity Abstract.Cr-substituted mesoporous aluminophosphate molecular sieve (Cr-MAP) was synthesized and characterized.
Introduction Mesoporous aluminophosphate (MAP) molecular sieve, with an ordered crystal structure consisting of alumino-oxygen and phosphor-oxygen tetrahedron, was first synthesized using hydrothermal technology [1].
The samples were characterized for evaluating the morphology and structure, subjected to powder X-ray diffraction (XRD).
That is, the sample adjusts its’ own structure and finally forms thermodynamic relatively stable construction by means of the repeatedly “expiration and inspiration” of Men+.
Table 2 Apparent activation energy of aluminophosphate molecular sieves substituted by metal catalysts En(kJ·mol-1) Eg(kJ·mol-1) Mn-AlPO 161.0 81.0 Co-AlPO - 61.0 Catalytic performance The materials characterized for structure and morphology were used as catalysts to evaluate their catalytic efficiency.
Online since: October 2018
Authors: Attaphon Chaimanatsakun, Prapasiri Pongprayoon
Revealing Mechanical Strength of Nanopores Using Atomic Finite Element Techniques Prapasiri Pongprayoon1,a and Attaphon Chaimanatsakun2,b* 1Department of Chemistry, Faculty of Science, Kasetsart University, Chatuchak, Bangkok, 10900, Thailand. 2Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University, Tungsukhla, Sriracha, Chonburi, 20230, Thailand.
With its ultra-thin structure, graphene is widely used in membrane technology as a nanofilter or nanopore.
The graphene monolayer was modelled as a frame-like structure.
Its structure is considered as a frame-like structure where covalent bonds are represented as beam members and joints of beams are carbon atoms.
Online since: March 2012
Authors: W. Cheng, P. Han, F. Yu, L. Yu, L.H. Cheng, H. Lu, Z.L. Xie, X.Q. Xiu, R. Zhang, Y.D. Zheng
The structure and the optimum growth temperatures of these samples have been studied.
X-ray diffraction (XRD) carried out in ARL X’TRA, Raman scattering spectroscopy in JY HR 800, Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) in OXFORD INCA X-Sight were used to survey the crystalline structure, the crystalline quality and the surface feature of SiC complex substrate and Si film grown on SiC complex substrate.
Fig.6 Fig.7 Fig.6 Cross-section appearance of Si grown on SiC complex substrate by SEM, Fig.7 Fit curve of the thickness of Si films grown under the different temperatures Fig.8 Fig.9 Fig.8 EDS curve of Si grown under 690℃ on SiC complex substrate, Fig.9 Fit C-V curve of Si grown on SiC substrate sample The structure of Si grown on SiC complex substrate can also be found by cross sectional scanning EDS along the direction from surface to substrate, as shown in Fig.8.
This structure corresponds to what has been observed in Fig.6.
[8] Andrew S.Grove 1966 Industrial and Engineering Chemistry 58(7) 48