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Online since: April 2015
Authors: Chau Chang Chou, Yu Hsiang Hao, Fu Yin Hsu
Both HA layers, original and crosslinked, were also quantitatively evaluated by carbohydrate chemistry assay according to the absorbance of the incident light.
The major failure mode of UHMWPE cartilage is damaged from wear, so its crystal structure and abrasion resistance are quite important.
With this approach, the coating can both increase the lubricity of the artificial cartilage by providing an aqua boundary layer and extend its life by increasing the strength of the structure.
The original chemical structure was modified (acyl hydrazine, hydrazide).
The major failure mode of UHMWPE cartilage is damaged from wear, so its crystal structure and abrasion resistance are quite important.
With this approach, the coating can both increase the lubricity of the artificial cartilage by providing an aqua boundary layer and extend its life by increasing the strength of the structure.
The original chemical structure was modified (acyl hydrazine, hydrazide).
Online since: April 2014
Authors: Li Peng Wu, Jin Bo Yang
Meso-structure of near-surface concrete and its effect on permeability were investigated.
Introduction All engineering structures are situated in a certain environment, and the environmental effects are applied to structures through the surface.
In order to investigate the meso-structure and transport performance of near-surface concrete, we should have knowledge of water-binder ratio and pore structure of hardened paste layer, the statistics of the aggregate size and its spatial distribution, and an in-depth understanding of the structure and permeability of interfacial transition zone.
Meso-Structure of Near-surface Concrete Through the observation of planes parallel and perpendicular to specimen surface, the meso-structure of near-surface concrete can be revealed.
A schematic diagram of near-surface concrete meso-structure.
Introduction All engineering structures are situated in a certain environment, and the environmental effects are applied to structures through the surface.
In order to investigate the meso-structure and transport performance of near-surface concrete, we should have knowledge of water-binder ratio and pore structure of hardened paste layer, the statistics of the aggregate size and its spatial distribution, and an in-depth understanding of the structure and permeability of interfacial transition zone.
Meso-Structure of Near-surface Concrete Through the observation of planes parallel and perpendicular to specimen surface, the meso-structure of near-surface concrete can be revealed.
A schematic diagram of near-surface concrete meso-structure.
Online since: August 2011
Authors: Zhi Ming Yu, Jia Xiu Hu, Jian Zhao, Yun Song Niu
The phase structure has changed from irregular amorphous structure to compacting crystal structure on the effect of heat treatment.
The morphology and the phase structure of manganese dioxide films were investigated by XRD and SEM.
It is proved that the substance on the surface of aging sample is γ-MnO2, the texture of MnOx has been changed from amorphous structure to crystal structure.
(ii) The morphology of MnO2 on the as-prepared stainless steel-based sample is amorphous structure.
Materials chemistry and Physics. 113 (2009) 650 [6] C.
The morphology and the phase structure of manganese dioxide films were investigated by XRD and SEM.
It is proved that the substance on the surface of aging sample is γ-MnO2, the texture of MnOx has been changed from amorphous structure to crystal structure.
(ii) The morphology of MnO2 on the as-prepared stainless steel-based sample is amorphous structure.
Materials chemistry and Physics. 113 (2009) 650 [6] C.
Online since: July 2012
Authors: Niculae Ene, Mircea Olteanu, Iulia Mirela Britchi, Niculae Stanica
In order to stabilize the stronger austenitic phase with centred facet cubic structure, an important amount of nickel was added.
This compound is crystalline and has a hexagonal structure with network parameters a = 10.37 Å and c = 37.19 Å according to ASTM 13-404 file, values close to our experimental values a = 10.36 Å and c = 37.17 Å.
Acknowledgments This article was carried out within the research programme “Molten salts” of “Ilie Murgulescu Institute” of Physical Chemistry, financed by the Romanian Academy. 6.
Sabine, Crystal structure of synthetic Mg-Whitlockite, Ca18Mg2H2(PO4)14, Can.
Chemistry, 52 (1974) 1155-1164
This compound is crystalline and has a hexagonal structure with network parameters a = 10.37 Å and c = 37.19 Å according to ASTM 13-404 file, values close to our experimental values a = 10.36 Å and c = 37.17 Å.
Acknowledgments This article was carried out within the research programme “Molten salts” of “Ilie Murgulescu Institute” of Physical Chemistry, financed by the Romanian Academy. 6.
Sabine, Crystal structure of synthetic Mg-Whitlockite, Ca18Mg2H2(PO4)14, Can.
Chemistry, 52 (1974) 1155-1164
Online since: December 2012
Authors: Ana Maria Grigoriu, Constantin Luca, Aurelia Grigoriu, Cristina Racu, Gabriela Hitruc, Bogdan Stoica, George Ervant Grigoriu
Poni” Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700035, Iasi, Romania
3”Gr.
The chemical structure of MCT-β-CD.
Schematic structure of nematic liquid crystals (NLC). - polymers: poly-4-vinylpyridine (Aldrich-Sigma) and vinyl cinnamate-vinylalcohol copolymer with ratio of the monomer units 45/55, i.e.
Poni” Institute of Macromolecular Chemistry, Iasi, Romania); - solvents (spectroscopic grade): chloroform (Merck), dimethyl sulfoxide (DMSO) (Fluka); - nematic liquid crystals (NLC): ZLI 1132 (Merck) – mixture of NLC with cyano-phenyl-cyclohexane-alkyl and cyano-biphenyl-cyclohexane-alkyl structures and red coloured ZLI 1142 (Merck) (Fig. 2); - supports for the polymer films: glass sheets, quartz and KRS5 windows (TlI, TlBr); - polarizer film ( 280 – 800 nm) (Polaroid HNP’B - USA). 2.
Hasegawa, Key Molecular Structure Determination of Photoalignement Materials from the Effects of Lineraly Polarized Deep UV Light on Several Polymers, Jpn.
The chemical structure of MCT-β-CD.
Schematic structure of nematic liquid crystals (NLC). - polymers: poly-4-vinylpyridine (Aldrich-Sigma) and vinyl cinnamate-vinylalcohol copolymer with ratio of the monomer units 45/55, i.e.
Poni” Institute of Macromolecular Chemistry, Iasi, Romania); - solvents (spectroscopic grade): chloroform (Merck), dimethyl sulfoxide (DMSO) (Fluka); - nematic liquid crystals (NLC): ZLI 1132 (Merck) – mixture of NLC with cyano-phenyl-cyclohexane-alkyl and cyano-biphenyl-cyclohexane-alkyl structures and red coloured ZLI 1142 (Merck) (Fig. 2); - supports for the polymer films: glass sheets, quartz and KRS5 windows (TlI, TlBr); - polarizer film ( 280 – 800 nm) (Polaroid HNP’B - USA). 2.
Hasegawa, Key Molecular Structure Determination of Photoalignement Materials from the Effects of Lineraly Polarized Deep UV Light on Several Polymers, Jpn.
Online since: May 2013
Authors: L.D. Jadhav, S.P. Patil, A.P. Jamale, A.U. Chavan
Consequently, nanoparticles with unique properties have become an emerging interdisciplinary field involving solid-state physics, chemistry, biology and materials science.
So the stoichiometric composition of the redox mixture as calculated based on the principles of propellant chemistry was 1: 0.55.
Material crystallizes in fluorite type structure with lattice parameter a = 5.418Å and no peak shift was observed.
These vibrational modes are connected to the defect spaces related to the extrinsic and intrinsic oxygen vacancies, respectively, present in the structure of Gd doped ceria nano crystalline sample [17-18].
The CuO nano particles give the pure monoclinic structure (JCPDS card files of CuO (80-1917)) with lattice parameters a = 4.68 Å, b = 3.42 Å and c = 5.12 Å and are in good conformity with the reported data.
So the stoichiometric composition of the redox mixture as calculated based on the principles of propellant chemistry was 1: 0.55.
Material crystallizes in fluorite type structure with lattice parameter a = 5.418Å and no peak shift was observed.
These vibrational modes are connected to the defect spaces related to the extrinsic and intrinsic oxygen vacancies, respectively, present in the structure of Gd doped ceria nano crystalline sample [17-18].
The CuO nano particles give the pure monoclinic structure (JCPDS card files of CuO (80-1917)) with lattice parameters a = 4.68 Å, b = 3.42 Å and c = 5.12 Å and are in good conformity with the reported data.
Online since: October 2013
Authors: Lei Zhang
Research on preparation and property of alternating multilayer polymer electromagnetic shielding materials
Lei Zhang
Kaifeng University, 475004, Kaifeng, China
zh_ang_lei1@126.com
Keywords: Alternating multilayer; Polymer materials; Electromagnetic shielding; Layered coating; PET film composite structure; Optical permeability rate
Abstract.
This paper treats metal mesh and PET film composite structure as in the electromagnetic shielding layer and prepares the alternating multilayer polymer electromagnetic shielding materials.
As is shown in Figure 2, we can coat Nickel powder as reticular formation and combine the results of the metal mesh and the PET film composite structures using coating technology and press it uniform.
Then, we can import uniform nickel metal mesh PET composite structure into mold and press and heat for the forming.
Applied Chemistry ,2009(26):495-497
This paper treats metal mesh and PET film composite structure as in the electromagnetic shielding layer and prepares the alternating multilayer polymer electromagnetic shielding materials.
As is shown in Figure 2, we can coat Nickel powder as reticular formation and combine the results of the metal mesh and the PET film composite structures using coating technology and press it uniform.
Then, we can import uniform nickel metal mesh PET composite structure into mold and press and heat for the forming.
Applied Chemistry ,2009(26):495-497
Online since: February 2013
Authors: Mariya G. Loriya, Ayodeji A. Ijagbuji, Alexei B. Tselishtev, Ivan I. Zakharov
Quantum chemical results of the B3LYP/6-311++G(3df,3pd) calculations for the optimized structures [10]: (a) molecular adduct of H2O with NO2*; (b) transition state (TS) for their reaction NO2* + H2O → HONO + OH.
Quantum chemical results of the B3LYP/6-311++G(3df,3pd) calculations [11]: (a) optimized structure of molecular adduct H2O-NO2; (b) transition state (TS) for reaction of methyl radical with a molecule of water (in the presence of NO2 in the ground electronic state).
From the structure of the transition state (Fig. 2b), it is obvious that an acceptor of atomic hydrogen at the "splitting " of a molecule of water is replaced with NO2, and hydrogen bridge НОН∙∙∙∙ОNO in adduct H2O-NO2 consistently forms a chemical bond in nitrous acid H-ONO.
Acknowledgments The authors are grateful to the Ukrainian-American Laboratory of Computational Chemistry, Scientific-Technical Complex "Institute of Single Crystals" of the Ukrainian National Academy of Science for the possibility of performing the quantum-chemical calculations.
Zakharov: Questions in Chemistry and Chemical Technology Vol. 4 (2009), p. 43 (in Russian)
Quantum chemical results of the B3LYP/6-311++G(3df,3pd) calculations [11]: (a) optimized structure of molecular adduct H2O-NO2; (b) transition state (TS) for reaction of methyl radical with a molecule of water (in the presence of NO2 in the ground electronic state).
From the structure of the transition state (Fig. 2b), it is obvious that an acceptor of atomic hydrogen at the "splitting " of a molecule of water is replaced with NO2, and hydrogen bridge НОН∙∙∙∙ОNO in adduct H2O-NO2 consistently forms a chemical bond in nitrous acid H-ONO.
Acknowledgments The authors are grateful to the Ukrainian-American Laboratory of Computational Chemistry, Scientific-Technical Complex "Institute of Single Crystals" of the Ukrainian National Academy of Science for the possibility of performing the quantum-chemical calculations.
Zakharov: Questions in Chemistry and Chemical Technology Vol. 4 (2009), p. 43 (in Russian)
Online since: June 2014
Authors: Yan Zhang
Skip several steps in a section, a phrase consisting of several movements, a music section, there are several combinations of step type and structure of these laws must be consistent with the song.
DS action is three dimensional structures through multimedia teaching our students to be able to make more intuitive, three-dimensional, comprehensive understanding of the structure and the difficulty of the action, in order to identify gaps. 3) Inspired by inducing method: in the learning process, teachers should induce students how to understand and appreciate dance, timely evaluation and encouragement given to enhance a sense of self-confidence.
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
DS action is three dimensional structures through multimedia teaching our students to be able to make more intuitive, three-dimensional, comprehensive understanding of the structure and the difficulty of the action, in order to identify gaps. 3) Inspired by inducing method: in the learning process, teachers should induce students how to understand and appreciate dance, timely evaluation and encouragement given to enhance a sense of self-confidence.
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Online since: January 2012
Authors: Yong Huan Ren, Chun Wei Yang, Feng Wu, Bo Rong Wu
The structure of LiODFB shows that it contains the molecular moieties identical to those of LiBOB and LiBF4, so it is safe to assume that LiODFB should have both the advantages of LiBOB and LiBF4.
The electrochemical behavior of a cathode material may depend strongly on its surface chemistry in solution and phenomena such as surface film formation. [8,9] It was previously found that a Li-ion cell with a LiBF4-based electrolyte demonstrated both excellent high temperature performance and low temperature performance [10–12].
From the structure of LiODFB it is rational to deduce that an optimal electrolyte can be formulated for a LiNi1/3Co1/3 Mn1/3O2 cathode by using a LiBF4/LiODFB salt mixture.
The LiODFB chemical structure resembles similarity to both of those of LiBOB and LiBF4.
Makimura, “Layered lithium insertion material of LiCo1/3Ni1/3Mn1/3O2 for lithium-ion batteries” Chemistry Letters, vol.7, 2001, pp. 642-643
The electrochemical behavior of a cathode material may depend strongly on its surface chemistry in solution and phenomena such as surface film formation. [8,9] It was previously found that a Li-ion cell with a LiBF4-based electrolyte demonstrated both excellent high temperature performance and low temperature performance [10–12].
From the structure of LiODFB it is rational to deduce that an optimal electrolyte can be formulated for a LiNi1/3Co1/3 Mn1/3O2 cathode by using a LiBF4/LiODFB salt mixture.
The LiODFB chemical structure resembles similarity to both of those of LiBOB and LiBF4.
Makimura, “Layered lithium insertion material of LiCo1/3Ni1/3Mn1/3O2 for lithium-ion batteries” Chemistry Letters, vol.7, 2001, pp. 642-643