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Online since: February 2014
Authors: Chien Chon Chen, Zue Chin Chang, Yi Chen Lin, Chih Yuan Chen
From plain view SEM micrographs, the pebble structure has shown in all ZnS thin films deposited at various substrate temperatures.
From XRD analysis, ZnS thin film exhibits hexagonal Wurtzite structure.
Introduction CIGS thin film is a high absorption coefficient and direct energy band gap semiconductor material with chalcopyrite structure.
Islam pointed out ZnS crystal has two common allotropes – zinc blende with BCC structure and wurtzite with HCP structure [12], the deposited ZnS thin film in the present study belongs to wurtzite structure through comparing the XRD results and JCPDS CARD.
Keyes, Journal of Physics and Chemistry of Solids Vol. 66 (2005), p.1862.
From XRD analysis, ZnS thin film exhibits hexagonal Wurtzite structure.
Introduction CIGS thin film is a high absorption coefficient and direct energy band gap semiconductor material with chalcopyrite structure.
Islam pointed out ZnS crystal has two common allotropes – zinc blende with BCC structure and wurtzite with HCP structure [12], the deposited ZnS thin film in the present study belongs to wurtzite structure through comparing the XRD results and JCPDS CARD.
Keyes, Journal of Physics and Chemistry of Solids Vol. 66 (2005), p.1862.
Online since: May 2014
Authors: Yue Sheng Chai, Xiao Dong Zhao, Chun Xiao Cao, Hui Qin Chen
The subsequent TMP below the beta transus can break down the colony structure into the equiaxed structure.
The evolution of microstructure during hot deformation is very sensitive to process parameters such as temperature, strain rate, strain, and “history” of the material (chemistry and starting microstructural condition).
Some researchers have also investigated the influence of chemistry and starting microstructures on the hot deformation behavior and microstructure evolution of titanium alloys [10,11].
For b-transformed structure: (7) For Deformed lamellar structure: (8) For Deformed equiaxed structure: (9) Equations (7)-(9) can be used to predict the grain size variation during deformation in the b field. 3.
Subtransus deformation mechanisms of TC11 titanium alloy withlamellar structure.
The evolution of microstructure during hot deformation is very sensitive to process parameters such as temperature, strain rate, strain, and “history” of the material (chemistry and starting microstructural condition).
Some researchers have also investigated the influence of chemistry and starting microstructures on the hot deformation behavior and microstructure evolution of titanium alloys [10,11].
For b-transformed structure: (7) For Deformed lamellar structure: (8) For Deformed equiaxed structure: (9) Equations (7)-(9) can be used to predict the grain size variation during deformation in the b field. 3.
Subtransus deformation mechanisms of TC11 titanium alloy withlamellar structure.
Online since: March 2015
Authors: Huai Qing Yu, Yan Gong Yang, Jiao Li, Wei Meng Si, Ri Min Cong, Si Yi Yang
Many types of dendrimers have been designed, researched and utilized in many fields, including chemistry and pharmaceutics[3-5].
Dendrimers of lower generations (0, 1, and 2) have highly asymmetric shape and possess more open structures as compared to higher generation dendrimers.
This is the characteristic diffraction peak to form a channel-type crystalline structure of inclusion complex.
This clearly demonstrated that these polyrotaxanes also possess the characteristic tubular or channel-type crystalline structure.
Luo: Dendritic polymer, Chemistry Industry Press, Beijing, 2002, p. 198 [2] J.H.
Dendrimers of lower generations (0, 1, and 2) have highly asymmetric shape and possess more open structures as compared to higher generation dendrimers.
This is the characteristic diffraction peak to form a channel-type crystalline structure of inclusion complex.
This clearly demonstrated that these polyrotaxanes also possess the characteristic tubular or channel-type crystalline structure.
Luo: Dendritic polymer, Chemistry Industry Press, Beijing, 2002, p. 198 [2] J.H.
Online since: February 2016
Authors: Naceur Hamdi, Cédric Fischmeister, Christian Bruneau, Hallouma Bilel, Rawdha Medyouni, A.S. Al-Ayed
c Chemistry Department, College of Science and Arts at Ar-Rass, Qassim University, P.O.
Schäfer, Oils and Fats as Renewable Raw Materials in Chemistry, Angew.
Vaya, Evidence for a Cyclic Mechanism in (.eta.3-Allyl)palladium Chemistry.
Singleton, Chemistry of cyclopentadienylruthenium and -osmium complexes. 4.
Borges, Furocoumarins in Medicinal Chemistry.
Schäfer, Oils and Fats as Renewable Raw Materials in Chemistry, Angew.
Vaya, Evidence for a Cyclic Mechanism in (.eta.3-Allyl)palladium Chemistry.
Singleton, Chemistry of cyclopentadienylruthenium and -osmium complexes. 4.
Borges, Furocoumarins in Medicinal Chemistry.
Online since: August 2011
Authors: H.R. Baharvandi, M. Tajdari, Ali Reza Nezamabadi
Covalent bonding between boron and carbon atoms in boron carbide structure makes it very stable and creates difficulties in sintering of this material.
For B4C-talc composites, the aluminum, magnesium and silicon concentration in the fired specimens and some green compacts were determined using wet chemistry and atomic adsorption.
Kang , “Low Temperature Processing of B4C – Al Composites Via Infiltration Technique” , Material Chemistry and Physics, Vol. 67 (2001), p. 249 –255 [2] Ke- feng Cai and Ce- Wen Nan, “The Effect of Silicon Addition on Thermoelectric Properties of a B4C Ceramic “, Materials Science and Eng., B67 (1999), p. 102-107 [3] L.
Schwetz, “Mechanical Properties of Injection Molded B4C- C Ceramics”, Journal of Solid State Chemistry, Vol. 133 (1997), p. 66-76 [9] Ke- feng Cai, Ce- Wen Nan, “The Influence of W2B5 Addition on Microstructure and Thermoelectric Properties of B4C Ceramic”, Ceramics International , Vol.26 (2000), p. 523527 [10] S.
For B4C-talc composites, the aluminum, magnesium and silicon concentration in the fired specimens and some green compacts were determined using wet chemistry and atomic adsorption.
Kang , “Low Temperature Processing of B4C – Al Composites Via Infiltration Technique” , Material Chemistry and Physics, Vol. 67 (2001), p. 249 –255 [2] Ke- feng Cai and Ce- Wen Nan, “The Effect of Silicon Addition on Thermoelectric Properties of a B4C Ceramic “, Materials Science and Eng., B67 (1999), p. 102-107 [3] L.
Schwetz, “Mechanical Properties of Injection Molded B4C- C Ceramics”, Journal of Solid State Chemistry, Vol. 133 (1997), p. 66-76 [9] Ke- feng Cai, Ce- Wen Nan, “The Influence of W2B5 Addition on Microstructure and Thermoelectric Properties of B4C Ceramic”, Ceramics International , Vol.26 (2000), p. 523527 [10] S.
Online since: May 2014
Authors: Xin Jin Cao, Priti Wanjara
Moreover, for the structural assembly of crack-sensitive aluminum alloys, such as AA6061-T6, HLAW can be a promising technique in light of the ability to adjust the chemistry of the molten weld pool through the selection of an appropriate filler alloy to minimize the probability of hot cracking in the weldment.
For the AA6061-T6 welds, examination of the microstructural characteristics in the FZ showed a typical dendritic structure with some shrinkage porosity, as revealed in Figure 3b.
Also, examination of the HAZ and the fusion boundary region of the weldment (Figure 3c) showed no cracking that is especially significant considering the crack-sensitive chemistry of the alloy.
Examination of the microhardness profile (Figure 4a) from the BM to the FZ for the AA6061-T6 weldments revealed a hardness trough, effectively due to the change in the precipitation state as well as the dilution of the weld chemistry for AA6061-T6 with the ER 5356 filler wire.
For the AA6061-T6 welds, examination of the microstructural characteristics in the FZ showed a typical dendritic structure with some shrinkage porosity, as revealed in Figure 3b.
Also, examination of the HAZ and the fusion boundary region of the weldment (Figure 3c) showed no cracking that is especially significant considering the crack-sensitive chemistry of the alloy.
Examination of the microhardness profile (Figure 4a) from the BM to the FZ for the AA6061-T6 weldments revealed a hardness trough, effectively due to the change in the precipitation state as well as the dilution of the weld chemistry for AA6061-T6 with the ER 5356 filler wire.
Online since: October 2012
Authors: R. Madivanane, V. Pouchaname, A. Tinabaye
FTIR, FTR SPECTRAL ANALYSIS AND DFT CALCUALTIONS
OF 1, 8-DIMETHYL NAPHTHALENE
V.Pouchaname,a, R.Madivanane,b and A.Tinabaye,c
a Department of Chemistry, BGCW, Puducherry, India
b Department of Physics, BGCW, Puducherry, India
c Department of Chemistry, K.M.Center for PGStudies, Puducherry, India
Corresponding author : bmadivanane.r@gmail.com
Keywords: 1, 8-dimethylnaphthalene, Vibrational analysis, FTIR, FTRaman, DFT calculation, Gaussian 09.
Fig.1: Structure of 18DMN Fig.3: Comparison of observed and simulated Raman spectra of 18DMN Fig.2: Comparison of observed and simulated Infrared spectra of 18DMN Table 1: Experimental and calculated Frequencies, IR & Raman intensities and assignments for 1, 8-dimethylnaphthalene.
[2] Matthew Thomas, Senior Capstone Seminar, Capstone Celebration Symposium, PLU Chemistry Department, 2007
Fig.1: Structure of 18DMN Fig.3: Comparison of observed and simulated Raman spectra of 18DMN Fig.2: Comparison of observed and simulated Infrared spectra of 18DMN Table 1: Experimental and calculated Frequencies, IR & Raman intensities and assignments for 1, 8-dimethylnaphthalene.
[2] Matthew Thomas, Senior Capstone Seminar, Capstone Celebration Symposium, PLU Chemistry Department, 2007
Online since: January 2013
Authors: Zhu Lian Yuan
Comparison of Antioxidant Activity in Five Fruit Wine of Guangxi in China
YUAN Zhu-lian
Department of Chemistry and Biological Engineering,Guangxi Normal University for Nationalities, Chongzuo 532200,Guangxi China
E-mail:332075601@163.com
Keywords: Fruit Wine; Polyphenol; Antioxidant Activity
Abstract: With reference to VC, for the first time, this thesis studied the antioxidant activity in five fruit wine of Guangxi by five different systems(NO2-, •OH, O2-·,DPPH· and reduction ability)and the scoring method.
5% oxygen to produce O2-· free radical, whose toxicity is the main reason of body oxygen toxicity, such as breaking DNA strand, depolymerization of polysaccharides, peroxidation reaction with unsaturated fatty acid, then which will cause a series of bad influence, such as genetic mutations, membrane damage, enzyme inactivation, mitochondrial oxidative phosphorylation function,et,al.The results were shown in figure 4: (1) The scavenging effect on O2-·could not be detected in the Rosa laevigata michx wine, probably because the sample had some basic compositions or pyrogallol analogues which could product more O2-·at different degree; (2) IC50 showed that the scavenging effect on O2-· of Sour plum wine was stronger than that of VC; (3) The level of scavenging O2-· in order was as follows: the Rosa laevigata michx winestructure-activity
Project Name: Key Disciplines Research Project with Advantage and Characteristic of Applied Chemistry in Guangxi, China.
[2] Edilene C Ferreim,Arm Rita A Nogueira,Gilberto B Souza,et a1.Effect of drying method and length of storage on tannin and total phenol concentrations in Pigeon pea seeds,Food Chemistry. 86 (2003) 17-23
5% oxygen to produce O2-· free radical, whose toxicity is the main reason of body oxygen toxicity, such as breaking DNA strand, depolymerization of polysaccharides, peroxidation reaction with unsaturated fatty acid, then which will cause a series of bad influence, such as genetic mutations, membrane damage, enzyme inactivation, mitochondrial oxidative phosphorylation function,et,al.The results were shown in figure 4: (1) The scavenging effect on O2-·could not be detected in the Rosa laevigata michx wine, probably because the sample had some basic compositions or pyrogallol analogues which could product more O2-·at different degree; (2) IC50 showed that the scavenging effect on O2-· of Sour plum wine was stronger than that of VC; (3) The level of scavenging O2-· in order was as follows: the Rosa laevigata michx wine
Project Name: Key Disciplines Research Project with Advantage and Characteristic of Applied Chemistry in Guangxi, China.
[2] Edilene C Ferreim,Arm Rita A Nogueira,Gilberto B Souza,et a1.Effect of drying method and length of storage on tannin and total phenol concentrations in Pigeon pea seeds,Food Chemistry. 86 (2003) 17-23
Online since: December 2005
Authors: Thierry Billon, Y. Bogumilowicz, J.M. Hartmann, F. Laugier, G. Rolland
The grading rate is low enough to ensure a good final constant composition layer, while
being still high enough so that the entire structure thickness is still reasonable (i.e. less than 10 µm).
Such a phenomena (for which we have no really convincing scientific explanation as of now) did not occurred for the 900°C sample, however. 900°C thus seems to be the upper temperature boundary for the growth of Si0.8Ge0.2 virtual substrates with a dichlorosilane + germane chemistry.
We have indeed achieved a 6x10 4 cm-2 field TDD (with almost no pile-ups) for Si0.8Ge0.2 virtual 5 10 4 1 10 5 1,5 10 5 2 10 5 2,5 10 5 50 100 150 200 250 300 4 8 12 16 Field TDD (cm -2) Growth rate (nm min.-1) %Ge / µm grading rate Figure 6 : Field Threading Dislocations Density of Si0.8Ge0.2 virtual substrates as a function of the SiGe growth rate (constant grading : 8% Ge / µm) or of the grading rate (constant growth rate : 140 nm min.-1) @ 900°C. substrates grown at 900°C using a dichlorosilane + germane chemistry.
Westhoff et al. [17] have indeed obtained for Si0.8Ge0.2 virtual substrates grown at 1050°C using a specially designed dichlorosilane + tetrachlorogermane chemistry a field TDD equal to 7x10 4 cm-2 (10% Ge / µm grading rate, more than 400 nm min
Such a phenomena (for which we have no really convincing scientific explanation as of now) did not occurred for the 900°C sample, however. 900°C thus seems to be the upper temperature boundary for the growth of Si0.8Ge0.2 virtual substrates with a dichlorosilane + germane chemistry.
We have indeed achieved a 6x10 4 cm-2 field TDD (with almost no pile-ups) for Si0.8Ge0.2 virtual 5 10 4 1 10 5 1,5 10 5 2 10 5 2,5 10 5 50 100 150 200 250 300 4 8 12 16 Field TDD (cm -2) Growth rate (nm min.-1) %Ge / µm grading rate Figure 6 : Field Threading Dislocations Density of Si0.8Ge0.2 virtual substrates as a function of the SiGe growth rate (constant grading : 8% Ge / µm) or of the grading rate (constant growth rate : 140 nm min.-1) @ 900°C. substrates grown at 900°C using a dichlorosilane + germane chemistry.
Westhoff et al. [17] have indeed obtained for Si0.8Ge0.2 virtual substrates grown at 1050°C using a specially designed dichlorosilane + tetrachlorogermane chemistry a field TDD equal to 7x10 4 cm-2 (10% Ge / µm grading rate, more than 400 nm min
Online since: June 2013
Authors: Ali Harkous, Gaël Colomines, Nadine Allanic, Rémi Deterre, Pierre Mousseau
Thiuram Monosulfide/Sulfur Vulcanization of NR, BR and SBR, Rubber Chemistry and Technology. 53 (1980) 160-175
Guerry, An Oscillating Disk Rheometer for Measuring Dynamic Properties during Vulcanization, Rubber Chemistry and Technology. 36 (1963) 451-458
Wriggers, Thermo-mechanical behaviour of rubber materials during vulcanization, International Journal of Solids and Structures. 42 (2005) 4758-4778
A Model and Treatment for Scorch Delay Kinetics, Rubber Chemistry and Technology. 37 (1964) 689-697
Guerry, An Oscillating Disk Rheometer for Measuring Dynamic Properties during Vulcanization, Rubber Chemistry and Technology. 36 (1963) 451-458
Wriggers, Thermo-mechanical behaviour of rubber materials during vulcanization, International Journal of Solids and Structures. 42 (2005) 4758-4778
A Model and Treatment for Scorch Delay Kinetics, Rubber Chemistry and Technology. 37 (1964) 689-697