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Online since: March 2015
Authors: Zhen Hua Xue, Yun Huan Xie
Figure 1shows the chemical structure of cellulose chain.
Nonreducing end Cellobiose Reducing end Fig. 1 Chemical structure of cellulose chain The molecular structure imparts cellulose with its characteristic properties: hydrophilicity, chirality, degradability, and broad chemical variability initiated by the high donor reactivity of the OH groups.
Understanding the supramolecular structure of cellulose fibre is important for analysis the water states and water diffusion in cellulose materials.
When expansion occurs in the cellulose structure, sorption occurs on the intermolecular bonds between bundles of fibre rather than in the internal structure until surface saturation is attained.
Sjöström, in: Wood Chemistry: Fundamentals and Applications, edited by E.
Nonreducing end Cellobiose Reducing end Fig. 1 Chemical structure of cellulose chain The molecular structure imparts cellulose with its characteristic properties: hydrophilicity, chirality, degradability, and broad chemical variability initiated by the high donor reactivity of the OH groups.
Understanding the supramolecular structure of cellulose fibre is important for analysis the water states and water diffusion in cellulose materials.
When expansion occurs in the cellulose structure, sorption occurs on the intermolecular bonds between bundles of fibre rather than in the internal structure until surface saturation is attained.
Sjöström, in: Wood Chemistry: Fundamentals and Applications, edited by E.
Online since: July 2011
Authors: Zhi Min Lu, Lin Lin Wang, Wei Feng Chen, Lin Zhang
A LOW-CYCLE FATIGUE DESIGN COMBINED FINITE ELEMENT ANALYSIS ABOUT PRESSURE VESSELS
LU Zhimin, WANG Linlin, Chen Weifeng, ZHANG Lin
(School of Chemical Engineering,
Inner Mongolia University of Technology, Hohhot, 010051, China)
Abstract: The study of Low-Cycle fatigue showed that strain is more important parameter than stress for describing fatigue property of materials .Exactly obtaining regional strain of the structure by analysis is key in fatigue design of complex structure .Therefore, the analysis and solution by finite element is very necessary.
Then the number of cycles would be calculated according to the formula (3). 2.1 Build Model See table 1 for model structure and figure 1 for size of the geometric detail of a shell. 16Mn is chosed for pressure vessel steel.
By using finite element analysis method, the elastic-plastic of the complex structure can be accurately analyzed.
The total life of structure will be the sum of crack initiation life and crack development life.
Beijing: Chemistry Industry Publisher, 2005. 4
Then the number of cycles would be calculated according to the formula (3). 2.1 Build Model See table 1 for model structure and figure 1 for size of the geometric detail of a shell. 16Mn is chosed for pressure vessel steel.
By using finite element analysis method, the elastic-plastic of the complex structure can be accurately analyzed.
The total life of structure will be the sum of crack initiation life and crack development life.
Beijing: Chemistry Industry Publisher, 2005. 4
Online since: May 2013
Authors: Volodymyr Kyrychok, Sergii Guzii, Rudolf Hela
The concrete also contains capillaries and pores greater than 10-5cm, cracks, voids through which aggressive gases and liquids proceed into a body of the structure.
Cavitation resistance of the coatings is caused by many factors, among them: character and speed of water movement, nature of substrate, structure of the coating, its adhesion to a substrate.
Karas, Geocement compositions for protection of concrete and reinforced concrete structures from exposure of acid environments, Collection of scientific publications “Building structures”, Kyiv: DPNDIBK, 2010, Issue 73, pp. 566-574
Guzii, The influence of modifying aditives on structure formation processes, adhesion and strength properties of the geocement matrix, Collection of scientific publications, “VAT A.S.
Breck, Zeolite Molecular Sieves: Structure, Chemistry and Use, Wiley, 1973
Cavitation resistance of the coatings is caused by many factors, among them: character and speed of water movement, nature of substrate, structure of the coating, its adhesion to a substrate.
Karas, Geocement compositions for protection of concrete and reinforced concrete structures from exposure of acid environments, Collection of scientific publications “Building structures”, Kyiv: DPNDIBK, 2010, Issue 73, pp. 566-574
Guzii, The influence of modifying aditives on structure formation processes, adhesion and strength properties of the geocement matrix, Collection of scientific publications, “VAT A.S.
Breck, Zeolite Molecular Sieves: Structure, Chemistry and Use, Wiley, 1973
Online since: January 2010
Authors: L.F. Santos, António Correia Diogo, M. Sá da Costa, Fabienne Farcas, M.I. Eusébio
In these particular conditions it is possible to get an image of
the colloidal structure of the bitumen, detecting populations of micelles and micellar agglomerates.
Within this framework, ageing can be characterized by an evolution of the colloidal structure towards an increase of intermolecular associations.
The colloidal structure image, as seen by "ultra-fast" HP-GPC profile (Fig. 2), changes with ageing.
Schabron: Binder Characterization and Evaluation, Vol. 2: Chemistry.
Choquet: International Symposium Chemistry of bitumens, Vol.
Within this framework, ageing can be characterized by an evolution of the colloidal structure towards an increase of intermolecular associations.
The colloidal structure image, as seen by "ultra-fast" HP-GPC profile (Fig. 2), changes with ageing.
Schabron: Binder Characterization and Evaluation, Vol. 2: Chemistry.
Choquet: International Symposium Chemistry of bitumens, Vol.
Online since: July 2012
Authors: Jin Shui Yao, Xiao Ning Zhang, Xi Jun Sun
In addition, the structures of the target molecules have been confirmed by IR and 1H NMR spectra, elemental analysis and polarimetric analysis.
As a result of its extensive and special use in organic synthesis and organosilicon chemistry, it is often used to prepare many organosilicon compounds and organosilicon polymers that are difficult to obtain by other synthesis methods[2,3,4].
The structure of hydrogen-containing polysiloxane was presented in Scheme 1 and was confirmed by IR spectrum as shown in Fig. 1(H%=0.01%)
From the structure of N-[(1S)-1-phenylethyl]prop-2 -enamide, we can see that there is a chiral carbon obviously.
Noll: Chemistry and Technology of Silicones(Book A)(Academic Press, China, 1968), p.132
As a result of its extensive and special use in organic synthesis and organosilicon chemistry, it is often used to prepare many organosilicon compounds and organosilicon polymers that are difficult to obtain by other synthesis methods[2,3,4].
The structure of hydrogen-containing polysiloxane was presented in Scheme 1 and was confirmed by IR spectrum as shown in Fig. 1(H%=0.01%)
From the structure of N-[(1S)-1-phenylethyl]prop-2 -enamide, we can see that there is a chiral carbon obviously.
Noll: Chemistry and Technology of Silicones(Book A)(Academic Press, China, 1968), p.132
Online since: March 2016
Authors: Ling Min Zeng, Liu Qing Liang, De Gui Li, Shu Hui Liu, Bin He, Chang Sheng Qin
Structure refinements of AlCrNi3Pr.
Structure refinement of AlCrNi3Pr was performed using the DBWS9807 program [7].
The crystal structure of the AlCrNi3Pr compound is shown in Fig. 3.
Crystal structure thermal expansion and electrical properties of GdCo0.67Ga1.33 compound.
Journal of Solid State Chemistry. 23 (1978) 271-274
Structure refinement of AlCrNi3Pr was performed using the DBWS9807 program [7].
The crystal structure of the AlCrNi3Pr compound is shown in Fig. 3.
Crystal structure thermal expansion and electrical properties of GdCo0.67Ga1.33 compound.
Journal of Solid State Chemistry. 23 (1978) 271-274
Online since: June 2019
Authors: Rostislav Drochytka, Grigory Ivanovich Yakovlev, Grigory Nikolaevich Pervushin, Zarina Saidova, Irina Sergeevna Polyanskikh, Iuliia Ginchitskaia, Valery Grakhov, Damir Khaseev, Аleksandr F. Buryanov
The results of studies of the MWCNTs effect on the structure of ceramics.
According to [8] the mix of MWCNT with surfactants can be used as the structuring additive.
It can form more order structure without defects on microscale level and this effect remains during the burning.
Kanka, Corrosion products among brick and concrete as threat to structure durability of industrial chimneys, Ceram.
Taylor, Chemistry of cement, Mir, Moscow, 1996
According to [8] the mix of MWCNT with surfactants can be used as the structuring additive.
It can form more order structure without defects on microscale level and this effect remains during the burning.
Kanka, Corrosion products among brick and concrete as threat to structure durability of industrial chimneys, Ceram.
Taylor, Chemistry of cement, Mir, Moscow, 1996
Online since: September 2013
Authors: Xiao Xu Teng, Jian Wei Shi, Shu Fen Zhang
Impact of Reactive Dye Structures on Dyeing Properties in Salt-free Reactive Dyeing
Xiaoxu Teng1, a, Jianwei Shi1,b and Shufen Zhang2,c
1School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing Fuling 408100, China
2State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
atengxiaoxu@sina.com, bjianweicn2005@163.com, czhangshf@dlut.edu.cn
Keywords: Reactive dye, Cationic cotton, Structure, Salt–free dyeing, Tertiary amine cationic polyacrylamide, Dyeing properties
Abstract.
Firstly, ten reactive dyes with different active groups were selected and their structures were shown in Table 1.
Fig. 1 Structure of TACPAM.
Table 1 Structures of the reactive dyes used in this paper.
Dye C.I generic name Abbreviation Structure 1 C.I.
Firstly, ten reactive dyes with different active groups were selected and their structures were shown in Table 1.
Fig. 1 Structure of TACPAM.
Table 1 Structures of the reactive dyes used in this paper.
Dye C.I generic name Abbreviation Structure 1 C.I.
Online since: July 2020
Authors: Nasikhudin Nasikhudin, Markus Diantoro, Ahmad Al Ittikhad, Joko Utomo, Thathit Suprayogi
In the previous work, the defect chemistry and resistance degradation of Fe doped SrTiO3 material and its application as potential semiconductor capacitors were investigated by Wang et al. [12].
The crystal structure of SrTi1-xBxO3 compounds at various compositions of boron was presented in Fig. 2.
Fig. 3 (b) depicts the crystal structure of SrTiO3 on the hkl (110).
Shubha, Oxide thermoelectric materials: A structure-property relationship, J.
Chen, Defect chemistry and resistance degradation in Fe-doped SrTiO3 single crystal, Acta Mater. 108 (2016) 229–240. https://doi.org/10.1016/j.actamat.2016.02.022
The crystal structure of SrTi1-xBxO3 compounds at various compositions of boron was presented in Fig. 2.
Fig. 3 (b) depicts the crystal structure of SrTiO3 on the hkl (110).
Shubha, Oxide thermoelectric materials: A structure-property relationship, J.
Chen, Defect chemistry and resistance degradation in Fe-doped SrTiO3 single crystal, Acta Mater. 108 (2016) 229–240. https://doi.org/10.1016/j.actamat.2016.02.022
Online since: February 2016
Authors: B.M. Goltsman, E.A. Yatsenko, L.A. Yatsenko
The structure and properties of the obtained samples were defined, the relationship between the type and amount of the introduced foaming agents and changes in the structure and properties of the samples were established.
Then the obtained samples were sawed in half to determine its internal structure.
Further clarifying analysis was conducted to establish effect of each foaming agents’ type and amount on the structure of foamed slag glass.
Thus, compounds with anthracite possess the worst structure, and with glycerol mixture – the best structure.
[6] Information on http://www2.epa.gov/coalash/coal-ash-basics [7] Information on http://rmrc.wisc.edu/ug-mat-coal-bottom-ashboiler-slag [8] Information on http://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/particle-size-conversion.html [9] B.K.
Then the obtained samples were sawed in half to determine its internal structure.
Further clarifying analysis was conducted to establish effect of each foaming agents’ type and amount on the structure of foamed slag glass.
Thus, compounds with anthracite possess the worst structure, and with glycerol mixture – the best structure.
[6] Information on http://www2.epa.gov/coalash/coal-ash-basics [7] Information on http://rmrc.wisc.edu/ug-mat-coal-bottom-ashboiler-slag [8] Information on http://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/particle-size-conversion.html [9] B.K.