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Online since: February 2014
Authors: Bohuslav Mašek, Hana Jirková, Vít Pileček
Retained austenite imparts plasticity to the otherwise brittle martensitic structure.
Optimum mechanical properties are achieved by using correct processing parameters and chemistry of the material.
As the experiment was performed on a material with a new chemistry, phase transformation temperatures and values of individual processing parameters had to be found.
Schedules involving reheating to two different PT produced martensitic structures with bainite and RA (Fig. 4).
The study revealed the large potential of the application of Q&P processing to a steel with cost-effective chemistry, most notably in terms of mechanical properties.
Optimum mechanical properties are achieved by using correct processing parameters and chemistry of the material.
As the experiment was performed on a material with a new chemistry, phase transformation temperatures and values of individual processing parameters had to be found.
Schedules involving reheating to two different PT produced martensitic structures with bainite and RA (Fig. 4).
The study revealed the large potential of the application of Q&P processing to a steel with cost-effective chemistry, most notably in terms of mechanical properties.
Online since: July 2008
Authors: Fei Hu Zhang, Xiao Zong Song, Yong Zhang
If we
reduce the removal unit in machining, work material may be wiped off at atomic level like
chemistry machining [5].
And the removal process will be dominated by the surface atomic structure instead of characteristic of the work material.
Fig. 2 illustrates the surface's atomic structure before and after OH adsorbing.
Fig. 2 Side schematic diagram of solid surface's atomic structure before and after OH adsorbing.
[9] Harrison W A: Electronic structure and the properties of solids.
And the removal process will be dominated by the surface atomic structure instead of characteristic of the work material.
Fig. 2 illustrates the surface's atomic structure before and after OH adsorbing.
Fig. 2 Side schematic diagram of solid surface's atomic structure before and after OH adsorbing.
[9] Harrison W A: Electronic structure and the properties of solids.
Online since: January 2005
Authors: A. Szemik Hojniak, I. Deperasińska, W.J. Buma, G. Balkowski, A.F. Pozharsky, N.V. Vistorobskii
Vistorobskii4
1
Faculty of Chemistry, University of Wrocław, Joliot-Curie 14 St., 50-383 Wrocław, Poland
2
Institute of Physics, Polish Academy of Sciences,
Al.
Both structures may contribute more or less equally to the fluorescence of CN-DMAN in a solution.
These features allow the classification of the A form as an anti-quinoidal A structure, and of the B form as a quinoidal structure [27, 28].
Computation Chemistry (Publication HC50-00-03-00, Hypercube, Inc., 1996)
Riddick: Computers and Chemistry.
Both structures may contribute more or less equally to the fluorescence of CN-DMAN in a solution.
These features allow the classification of the A form as an anti-quinoidal A structure, and of the B form as a quinoidal structure [27, 28].
Computation Chemistry (Publication HC50-00-03-00, Hypercube, Inc., 1996)
Riddick: Computers and Chemistry.
Online since: May 2013
Authors: Zhen Hua Duan, Ju Lan Wang, Chang Yu Cheng, Yang Hai
Determination and Identification of chondroitin sulfate from Tilapia Byproducts
Zhen-hua Duan1, 2, a, Chang-yu Cheng1, Yang Hai2, Ju-lan Wang1
1Key Laboratory of Tropical Biological Resourced of MOE, Hainan University, Haikou 570228, China
2College of Food Science and Technology, Hainan University, Haikou 570228, China
adzhwjl@hotmail.com (corresponding author)
Keywords: chondroitin sulfate; tilapia byproducts; chemistry structure
Abstract.
In order to probe the structure of chondroitin sulfate(CS) from tilapia fish, the CS was extracted from tilapia (Oreochromis niloticus) byproducts with the combination of ultrasonic and microwave, some means including high performance liquid chromatography (HPLC), infrared spectra (IR) and nuclear magnetic resonance (NMR) were used in this paper.
The objective of this study was to determine the purity, and to indentify the structure by HPLC and IR, respectively.
,Vol.818(2005),p.133 [2] S.Sakai, E.Otake, T.Toida, Y.Goda:Chem Pharm Bull., Vol.55(2007), p.299 [3] R.M.Lauder,T.N.Huckerby,G.M.Brown,M.T.Bayliss,I.A.Nieduszynski: Biochemical Journal, Vol.358(2001), p.523 [4] R.M.Lauder, T.N.Huckerby, I.A.Nieduszynski: Glycobiology, Vol.10 (2000), p.393 [5] P.A.S.Mourao, M.S.Pereira, M.S.G,Pavao, B.Mulloy: Journal of Biological Chemistry, Vol.271 (1996),p.23973 [6] X.B.Su, A.J.Liu:Science and technology of food industry, Vol.25(2004), p.98 [7] X.J.Zhang, H.Zhang, Science and technology of food industry, Vol.31(2010),p.258 [8] H.Zhang, G.H.Xie, D.Z.
In order to probe the structure of chondroitin sulfate(CS) from tilapia fish, the CS was extracted from tilapia (Oreochromis niloticus) byproducts with the combination of ultrasonic and microwave, some means including high performance liquid chromatography (HPLC), infrared spectra (IR) and nuclear magnetic resonance (NMR) were used in this paper.
The objective of this study was to determine the purity, and to indentify the structure by HPLC and IR, respectively.
,Vol.818(2005),p.133 [2] S.Sakai, E.Otake, T.Toida, Y.Goda:Chem Pharm Bull., Vol.55(2007), p.299 [3] R.M.Lauder,T.N.Huckerby,G.M.Brown,M.T.Bayliss,I.A.Nieduszynski: Biochemical Journal, Vol.358(2001), p.523 [4] R.M.Lauder, T.N.Huckerby, I.A.Nieduszynski: Glycobiology, Vol.10 (2000), p.393 [5] P.A.S.Mourao, M.S.Pereira, M.S.G,Pavao, B.Mulloy: Journal of Biological Chemistry, Vol.271 (1996),p.23973 [6] X.B.Su, A.J.Liu:Science and technology of food industry, Vol.25(2004), p.98 [7] X.J.Zhang, H.Zhang, Science and technology of food industry, Vol.31(2010),p.258 [8] H.Zhang, G.H.Xie, D.Z.
Online since: September 2013
Authors: Ting Ting Huang, Quan Hua Fan, Xiao Ping Zhang, Yang Xu, Zhang Xue Yu, Hai Xing Liu, Qing Hua Zhang
Study on a structure of 2,6-pyridine-dicarboxylic acid Mn, Mn2(C7H3NO4)24H2O
Hai-Xing Liua, Qing-Hua Zhangb, Zhang-Xue Yuc, Xiao-Ping Zhangd, Yang Xue, Quan-Hua Fanf, Ting-Ting Huangg
Chemistry & Chemical and Environmental Engineering College, Weifang University, Weifang 261061, P.R.
China ahaixingliu@tom.com, b504238577@qq.com, cyuzhangxue1993@163.com, d1942182384@qq.com, e1010263487@qqq.com, f2811736935@qq.com, g974029734@qq.com, Keywords: Mn complex, structure analysis, hydrogen bond Abstract: novel Mn metal complex C14H14Mn2N2O12 has been synthesized from hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction.
Results and discussions The title crystal structure (Fig.1) is built up of one Mn cation, 2,6-pyridine-dicarboxylic acid anion and water molecular.
The crystal data and structure refinement is shown in Table 1.
ZR2010BL025), Open Project of State Key Laboratory of Supramolecular Structure and Materials (No. sklssm201323)(Jilin University), State Key Laboratory of Inorganic Synthesis and Preparative Chemistry (No. 2011-13)(Jilin University).
China ahaixingliu@tom.com, b504238577@qq.com, cyuzhangxue1993@163.com, d1942182384@qq.com, e1010263487@qqq.com, f2811736935@qq.com, g974029734@qq.com, Keywords: Mn complex, structure analysis, hydrogen bond Abstract: novel Mn metal complex C14H14Mn2N2O12 has been synthesized from hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction.
Results and discussions The title crystal structure (Fig.1) is built up of one Mn cation, 2,6-pyridine-dicarboxylic acid anion and water molecular.
The crystal data and structure refinement is shown in Table 1.
ZR2010BL025), Open Project of State Key Laboratory of Supramolecular Structure and Materials (No. sklssm201323)(Jilin University), State Key Laboratory of Inorganic Synthesis and Preparative Chemistry (No. 2011-13)(Jilin University).
Online since: December 2008
Authors: Michael J. Pomeroy, Stuart Hampshire
Developments in SiAlON Glasses and their Derivatives: Effects of
Chemistry on Properties
Stuart Hampshirea and Michael J.
Effects of Chemistry on Properties Fig. 1 shows that glass transition temperature, Tg, increases linearly with nitrogen content for two series of M-Si-Al-O-N glasses where M= Mg or Y and keeping the cation ratios constant (in eq.%, M:Si:Al = 28:56:16).
Substitution of one Ln cation by another appears to cause no change in the overall glass structure and property changes are solely dependent on CFS.
These effects of chemistry have implications for high temperature behaviour of sialon and Si3N4 ceramics.
The effects on properties of changes in grain boundary glass chemistry, as a result of changes in sintering additives, can be summarised as follows [10]: 1) When 18 e/o N is substituted for oxygen, viscosity increases by >2 orders of magnitude. 2) Increasing the Y:Al ratio of the glass results in a further slight increase in viscosity. 3) Changing the rare earth cation from a larger ion, such as La or Ce, to a smaller cation, such as Er or Lu, increases viscosity by a further 3 orders of magnitude.
Effects of Chemistry on Properties Fig. 1 shows that glass transition temperature, Tg, increases linearly with nitrogen content for two series of M-Si-Al-O-N glasses where M= Mg or Y and keeping the cation ratios constant (in eq.%, M:Si:Al = 28:56:16).
Substitution of one Ln cation by another appears to cause no change in the overall glass structure and property changes are solely dependent on CFS.
These effects of chemistry have implications for high temperature behaviour of sialon and Si3N4 ceramics.
The effects on properties of changes in grain boundary glass chemistry, as a result of changes in sintering additives, can be summarised as follows [10]: 1) When 18 e/o N is substituted for oxygen, viscosity increases by >2 orders of magnitude. 2) Increasing the Y:Al ratio of the glass results in a further slight increase in viscosity. 3) Changing the rare earth cation from a larger ion, such as La or Ce, to a smaller cation, such as Er or Lu, increases viscosity by a further 3 orders of magnitude.
Online since: October 2007
Authors: Zbigniew Sojka, Pawel Jakubus, Andrzej Adamski
Metastabilization of Tetragonal Zirconia by Doping
with Low Amounts of Silica
Andrzej Adamski 1,a
, Paweł Jakubus 2,b
and Zbigniew Sojka 1,3,c
1
Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Cracow, Poland
2
Institute of Chemistry and Environment Protection, Szczecin Technical University,
al.
Using the concepts of zirconium aquatic chemistry, this effect was explained by incorporation of silicates into hydrous zirconia protostructures.
The role of both the precipitation and the aging temperatures can be rationalized using the concepts of the aquatic chemistry of zirconium(IV) [25].
The number of interparticle contacts increased, the structure is less open and strongly agglomerated, also manifested in the collapse of the pore structure [17].
Conclusions The influence of the precipitation and the aging temperature on metastabilization of t-ZrO2, obtained by forced hydrolysis of ZrOCl2 solutions, has been discussed in terms of the concepts of aquatic chemistry of Zr(IV).
Using the concepts of zirconium aquatic chemistry, this effect was explained by incorporation of silicates into hydrous zirconia protostructures.
The role of both the precipitation and the aging temperatures can be rationalized using the concepts of the aquatic chemistry of zirconium(IV) [25].
The number of interparticle contacts increased, the structure is less open and strongly agglomerated, also manifested in the collapse of the pore structure [17].
Conclusions The influence of the precipitation and the aging temperature on metastabilization of t-ZrO2, obtained by forced hydrolysis of ZrOCl2 solutions, has been discussed in terms of the concepts of aquatic chemistry of Zr(IV).
Online since: June 2015
Authors: E.I. Get`man, K.A. Chebyshev, L.I. Ardanova, L.V. Pasechnik
Synthesis, Structure Refinement and Conductivity of Ln2-xCdxMoO6-x/2
E.I.
Pasechnik1 1Department of Inorganic Chemistry, Donetsk National University, 24 Universitetskaya, Donetsk 83001, Ukraine 2Department of Chemistry and Geology, Minnesota State University, Mankato, 241 Ford Hall, Mankato, MN 56001, USA.
Crystallization of larger rare-earth element molybdates (La – Nd) in fluorite-related pseudocubic structures, and smaller rare-earth element molybdates (Sm – Lu) in monoclinic structure suggests to possibility of transition from monoclinic to cubic structure molybdates using substitution for larger cations [10].
The structure of CdTm4Mo3O16 was used as a starting model for the refinement [12].
Chemistry of Materials 1 (1989) 253-259
Pasechnik1 1Department of Inorganic Chemistry, Donetsk National University, 24 Universitetskaya, Donetsk 83001, Ukraine 2Department of Chemistry and Geology, Minnesota State University, Mankato, 241 Ford Hall, Mankato, MN 56001, USA.
Crystallization of larger rare-earth element molybdates (La – Nd) in fluorite-related pseudocubic structures, and smaller rare-earth element molybdates (Sm – Lu) in monoclinic structure suggests to possibility of transition from monoclinic to cubic structure molybdates using substitution for larger cations [10].
The structure of CdTm4Mo3O16 was used as a starting model for the refinement [12].
Chemistry of Materials 1 (1989) 253-259
Online since: August 2015
Authors: Heru Susanto, Mumpuni Asih Pratiwi, Ronny Windu Sudrajat, Sri Sutanti
The characterization included degree of swelling both in water and ethanol, permeability measurement, surface morphology (by SEM) and surface chemistry (by FTIR).
Effect the concentration of the coating solution on permeability Membrane surface chemistry The membrane surface chemistry was analyzed by using Fourier transform infrared spectroscopy (FTIR).
As expected, the surface morphology of PES membrane shows a porous structure, while the surface morphology of PES membrane coated with chitosan-alginate mixture shows a dense structure.
The IR spectra data indicate that changes in the surface chemistry after coating by chitosan-alginate mixture.
Coma, Antimicrobial and phsycochemical properties of chitosan-HPMC-based films, Journal of Agricultural of Food Chemistry, 52 (2004) 6585-6591
Effect the concentration of the coating solution on permeability Membrane surface chemistry The membrane surface chemistry was analyzed by using Fourier transform infrared spectroscopy (FTIR).
As expected, the surface morphology of PES membrane shows a porous structure, while the surface morphology of PES membrane coated with chitosan-alginate mixture shows a dense structure.
The IR spectra data indicate that changes in the surface chemistry after coating by chitosan-alginate mixture.
Coma, Antimicrobial and phsycochemical properties of chitosan-HPMC-based films, Journal of Agricultural of Food Chemistry, 52 (2004) 6585-6591