Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: January 2010
Authors: Knut Marthinsen, Trond Furu, Erik Nes, Bjørn Holmedal, Shahriar Abtahi, Jesper Friis
It is demonstrated that the model, without any retuning,
only accounting for the variations in alloy chemistry and deformation conditions is capable
of predicting the stress-strain for a range of compositions, strain rates and temperatures.
The Model A new approach to the modelling of sub-structure evolution and work hardening during plastic deformation was recently proposed by Nes [1] and has been further developed by Nes, Marthinsen and co-workers [2-4].
By combining the solution for the dislocation storage problem with models for dynamic recovery of network dislocations and sub-boundary structures, a general internal state variable description is obtained.
At small strains the stored dislocations are arranged in a cell structure characterised by cell size, δ, cellwall thickness, h, and wall dislocation density, ρb, and density within cells, ρi.
Tables 1 and 2) only accounting for the changes in alloy chemistry, in terms of alloying elements in solid solution and dispersoids as indicated in Tables 1 and 2.
The Model A new approach to the modelling of sub-structure evolution and work hardening during plastic deformation was recently proposed by Nes [1] and has been further developed by Nes, Marthinsen and co-workers [2-4].
By combining the solution for the dislocation storage problem with models for dynamic recovery of network dislocations and sub-boundary structures, a general internal state variable description is obtained.
At small strains the stored dislocations are arranged in a cell structure characterised by cell size, δ, cellwall thickness, h, and wall dislocation density, ρb, and density within cells, ρi.
Tables 1 and 2) only accounting for the changes in alloy chemistry, in terms of alloying elements in solid solution and dispersoids as indicated in Tables 1 and 2.
Online since: August 2009
Authors: Zhi Feng Lin, Shu Fang Zhang, Dun Zhang
Introduction
In recent years, supramolecular chemistry has gained great interests in several areas such as
coordination chemistry, materials and life sciences, and has shown rapid progress in the ascendant
trend of development [1].
In supramolecular chemistry, different types of intermolecular forces can be distinguished.
The structure of the supramolecular compound was determined by infrared spectra, UV and X-ray diffraction.
Results and discussion Crystal structures.
Crystal data and structure refinement for the compound are shown in Table 1.
In supramolecular chemistry, different types of intermolecular forces can be distinguished.
The structure of the supramolecular compound was determined by infrared spectra, UV and X-ray diffraction.
Results and discussion Crystal structures.
Crystal data and structure refinement for the compound are shown in Table 1.
Online since: August 2015
Authors: Roto Roto, Dyah Purwaningsih, Narsito Narsito, Hari Sutrisno
The series of LiCoxMn2-xO4 have well–developed cubic crystal structure with Fd3m phase, and the increase in the dopant does not change its structure.
Table 1 shows the lattice parameters and volumes of the refined structure of the materials.
The series of LiCoxMn2-xO4 have cubic crystal structure with Fd3m phase, and the increase in the doping composition does not affect its structure.
Tabuchi, Synthesis, structure and phase relationship in lithium manganese oxide spinel, Journal of Materials Chemistry 14 (2004) 1948–1958
Bruce, Solid-state chemistry for lithium-ion batteries, Chemical Communications 19 (1997) 1817
Table 1 shows the lattice parameters and volumes of the refined structure of the materials.
The series of LiCoxMn2-xO4 have cubic crystal structure with Fd3m phase, and the increase in the doping composition does not affect its structure.
Tabuchi, Synthesis, structure and phase relationship in lithium manganese oxide spinel, Journal of Materials Chemistry 14 (2004) 1948–1958
Bruce, Solid-state chemistry for lithium-ion batteries, Chemical Communications 19 (1997) 1817
Online since: August 2014
Authors: Chao Xu, Yong Hui Jia
Solved crystal structure containing Ni and Cu charge transfer salt of a compound containing Ni and Cu are columnar crystal structure with space group are a few, no significant interaction between the anion; ethyl violet cation having a triangular plane configuration propeller-like conformation distribution, only the symmetry of the whole molecule instead of the expected a D3, they form dimers through false weak point contact role, and with the presence of hydrogen bonds between the anion.
Royo: Rhenium Compounds, Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, from Comprehensive Organometallic Chemistry III, Vol.5 (2007), p.855-960 [4] P.
Vos: The role of the bridging ligand in photocatalytic supramolecular assemblies for the reduction of protons and carbon dioxide, Coordination Chemistry Reviews, Vol.256 (2012), p.1682-1705 [7] M.
Burgess: Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, from Comprehensive Coordination Chemistry II, Vol.5 (2003), p.403-553 [8] E.
Wächtler: Analysis and characterization of coordination compounds by resonance Raman spectroscopy, Coordination Chemistry Reviews, Vol.256 (2012), p.1479-1508
Royo: Rhenium Compounds, Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, from Comprehensive Organometallic Chemistry III, Vol.5 (2007), p.855-960 [4] P.
Vos: The role of the bridging ligand in photocatalytic supramolecular assemblies for the reduction of protons and carbon dioxide, Coordination Chemistry Reviews, Vol.256 (2012), p.1682-1705 [7] M.
Burgess: Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, from Comprehensive Coordination Chemistry II, Vol.5 (2003), p.403-553 [8] E.
Wächtler: Analysis and characterization of coordination compounds by resonance Raman spectroscopy, Coordination Chemistry Reviews, Vol.256 (2012), p.1479-1508
Online since: October 2010
Authors: Koya Hayashi, M. Tomohara, K. Fujino, Genta Sakane, Y. Katayama
B
A
The crystal structure of the CDS is similar with a CdI2-type structure.
Fig.2 (010) section of calcium dodecyl sulfate (CDS) crystal structure and fitting of Ca-Ca distances of CDS and Calcite The CDS structure is the lower and the calcite structure is the upper.
References [1] Stephen Mann, “Biomineralization, principles and Concept Bioinorganic Materials Chemistry”, Oxford Univ.
[7]Stephen Mann, “Biomineralization, principles and Concept Bioinorganic Materials Chemistry”, Oxford Univ.
[8] Stephen Mann, “Biomineralization, principles and Concept Bioinorganic Materials Chemistry”, Oxford Univ.
Fig.2 (010) section of calcium dodecyl sulfate (CDS) crystal structure and fitting of Ca-Ca distances of CDS and Calcite The CDS structure is the lower and the calcite structure is the upper.
References [1] Stephen Mann, “Biomineralization, principles and Concept Bioinorganic Materials Chemistry”, Oxford Univ.
[7]Stephen Mann, “Biomineralization, principles and Concept Bioinorganic Materials Chemistry”, Oxford Univ.
[8] Stephen Mann, “Biomineralization, principles and Concept Bioinorganic Materials Chemistry”, Oxford Univ.
Online since: January 2010
Authors: H.L. Kwok
The study of solids and materials, while having originated from the disciplines of physics and chemistry, has evolved independently over the past few decades.
In particular, the more recent developments in device physics and technology have not necessarily been driven by new concepts in physics or new materials, but rather by the ability of engineers to control crystal structures and properties better via advances in crystal growth and patterning techniques.
Keeping the subject matter at the elementary level as far as possible, the first 2 chapters introduce classical theories and address questions as elementary as, what are solids, before moving on to examine crystal structures and the link between crystal structures and materials properties.
In particular, the more recent developments in device physics and technology have not necessarily been driven by new concepts in physics or new materials, but rather by the ability of engineers to control crystal structures and properties better via advances in crystal growth and patterning techniques.
Keeping the subject matter at the elementary level as far as possible, the first 2 chapters introduce classical theories and address questions as elementary as, what are solids, before moving on to examine crystal structures and the link between crystal structures and materials properties.
Online since: December 2014
Authors: Ya Dong Bai, Hai Rong Zhang, Pei Wan Bai, Hong Yan Liu, Shen Hua Han, Wen Shan Zhang, Bo Wang, Kai Yuan, Dian Hua Song, Yao Ya Luo
Phase-selective synthesis of a silicoaluminophosphate molecular sieve
with 3-Aminopropyltriethoxysilane as the silica source
Yadong Bai1,Hairong Zhang2,a , Peiwan Bai2, Hongyan Liu2, Shenhua Han2, Wenshan Zhang2, Bo Wang2 ,KaiYuan2,Dianhua Song2,Yaoya Luo2
1 College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2 College of Chemistry and Chemical Engineering, Institute of Applied Chemistry, Shanxi Datong University, Datong 037009, China
aemail:zhengmingzhang16888@126.com
Keywords: SAPO-34, SAPO-5, 3-Aminopropyltriethoxysilane, Phase-selective synthesis
Abstract: Silicoaluminophosphate (SAPO) molecular sieves with CHA and AFI structures have been synthesized under hydrothermal conditions from similar reaction mixtures using 3-Aminopropyl- triethoxysilane as silicon source.
All these parameters affect the structure, size, shape and composition of the condensation products.
In addition, the CHA and AFI structures compete, and the SAPO-5 structure may transform into the SAPO-34 structure from similar reaction mixtures.
In addition, the SAPO-5 structure may transform into the SAPO-34 structure with increase of crystallization time and temperature probably due to the relative stability of the two phases at the reaction conditions [3, 9].
It is known that the CHA and AFI structures compete and SAPO-5 with AFI structure can be selectively formed by fast crystallization [8].
All these parameters affect the structure, size, shape and composition of the condensation products.
In addition, the CHA and AFI structures compete, and the SAPO-5 structure may transform into the SAPO-34 structure from similar reaction mixtures.
In addition, the SAPO-5 structure may transform into the SAPO-34 structure with increase of crystallization time and temperature probably due to the relative stability of the two phases at the reaction conditions [3, 9].
It is known that the CHA and AFI structures compete and SAPO-5 with AFI structure can be selectively formed by fast crystallization [8].
Online since: April 2016
Authors: Nan Nan Wang, Yun Li, Hai Feng Cheng, Yong Jiang Zhou, Ting Ting Li
Hybrid TiO2 nanowire–nanotube structure was synthesized by a facile anodization on Ti substrate.
(iv) the formation of uniform porous structure(showed in Fig. 1a).uniform porous structure formed due to uniform distribution of electic field on the surface of oxide layer and chemical dissolution[8].
Moreover, the effect of ultrasonic cleaning on the nanowire–nanotube structure was studied.
New Journal of Chemistry,2008,32:2164-2168
A new benchmark for TiO2 nanotube array growth by anodization[J].Journal of Physical Chemistry C, 2007, 111(20): 7235-7241.
(iv) the formation of uniform porous structure(showed in Fig. 1a).uniform porous structure formed due to uniform distribution of electic field on the surface of oxide layer and chemical dissolution[8].
Moreover, the effect of ultrasonic cleaning on the nanowire–nanotube structure was studied.
New Journal of Chemistry,2008,32:2164-2168
A new benchmark for TiO2 nanotube array growth by anodization[J].Journal of Physical Chemistry C, 2007, 111(20): 7235-7241.
Online since: August 2013
Authors: Elena B. Ivanova, Tatyana N. Gnitetskaya
Definition of interdisciplinary connection
The interdisciplinary connection is a structure of elements of educational system connecting the elements of interdisciplinary content of education and consist of the following:
· Connection object – any element of knowledge, skill and experience belonging to the basic discipline and using in connected discipline (at least in two elements of the structure);
· Connection channel – one or more elements of educational technology, relevant to the disciplines the connection between which is determined;
Direction of interdisciplinary connection is set by choice of basic discipline: from basic discipline to connected one.
For example, the cluster in the structure of ecology speciality student training is formed on the base of connections between natural science disciplines (physics, chemistry) and special discipline (technical system and technological risk).
One of them “Hazardous chemical objects and technogenic risk” by its content connected with physics and chemistry, the name of the second one “Environmental monitoring: step by step” evidences some distance exists between it and academic material of physics and chemistry.
Using such approach, the physical cluster (group of physical concepts, laws, theories, models and principles) is realized as interdisciplinary physical cluster in the training structure of environmental specialities students.
- Moscow: Publishing house „Chemistry“, Chemistry Department of Moscow University, 2003. – p.254.
For example, the cluster in the structure of ecology speciality student training is formed on the base of connections between natural science disciplines (physics, chemistry) and special discipline (technical system and technological risk).
One of them “Hazardous chemical objects and technogenic risk” by its content connected with physics and chemistry, the name of the second one “Environmental monitoring: step by step” evidences some distance exists between it and academic material of physics and chemistry.
Using such approach, the physical cluster (group of physical concepts, laws, theories, models and principles) is realized as interdisciplinary physical cluster in the training structure of environmental specialities students.
- Moscow: Publishing house „Chemistry“, Chemistry Department of Moscow University, 2003. – p.254.
Online since: October 2014
Authors: Marietjie J. Ungerer, Cornie Van Sittert, Henning M. Krieg, Derik J. van der Westhuizen
The Journal of Physical Chemistry A, 2006. 110 (50): pp. 13632 - 13639
Modern Density Functional Theory: A tool for chemistry.
Theoretical and Computational Chemistry, ed.
Journal of Fluorine Chemistry, 2010. 131(1): pp. 21 - 28
Edwards, The structures of niobium and tantalum pentafluorides.
Modern Density Functional Theory: A tool for chemistry.
Theoretical and Computational Chemistry, ed.
Journal of Fluorine Chemistry, 2010. 131(1): pp. 21 - 28
Edwards, The structures of niobium and tantalum pentafluorides.