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Online since: October 2014
Authors: Kamonrat Thamphueak, Oraporn Bualuang
The most commonly exported corn products from Thailand are sweet corn, either fresh or frozen grains.
It was then ventilated with ambient air until the moisture content of grains was about 16±1% dry-basis [4].
Each grain sample was placed in a 25 ml cylinder.
Void fraction decreased with increasing moisture content due to expansion of the germinated corn grain.
As the germinated corn volume increased the number of grains in the same volume decreased, therefore the mass of the germinated sweet corn per unit volume decreased.
It was then ventilated with ambient air until the moisture content of grains was about 16±1% dry-basis [4].
Each grain sample was placed in a 25 ml cylinder.
Void fraction decreased with increasing moisture content due to expansion of the germinated corn grain.
As the germinated corn volume increased the number of grains in the same volume decreased, therefore the mass of the germinated sweet corn per unit volume decreased.
Online since: May 2020
Authors: Fang Po Li, Bin Zhang, Zhi Wei Zhang
M-A distributes in ferrite boundaries and austenite grain boundaries.
When strain is small, PF preferentially nucleates at grain boundaries of original austenite.
With the increasing of shape, a large number of deformation bands appear in the non-recrystallized zone, and PF phase forms gradually on the grain boundary and deformation band.
It has regular grain shape and straight grain boundary, as equiaxed or regular polygon.
It has bright white matrix and gray-black grain boundary in optical microscopy.
When strain is small, PF preferentially nucleates at grain boundaries of original austenite.
With the increasing of shape, a large number of deformation bands appear in the non-recrystallized zone, and PF phase forms gradually on the grain boundary and deformation band.
It has regular grain shape and straight grain boundary, as equiaxed or regular polygon.
It has bright white matrix and gray-black grain boundary in optical microscopy.
Online since: April 2011
Authors: Shuang Shii Lian, W.C. Luo, Y.L. Ke, F.M. Chu
It is also found that α-Fe (Ferrite) plates are observed near the grain boundaries when the sulfur content reaches a certain level.
The Nitrogen/Oxygen content was measured by LECO TC1366 inert gas fusion analyzer and Carbon/Sulfur content was measured by HORIBA non dispersive infrared gas analyzer. 2.6 Cell toxicity sample preparation The high nitrogen stainless steel samples were cut by an electrode-discharge wire cutter to about 5 mm × 3 mm × 1 mm and ground by abrasive with grain sizes #1000.
The rate of this reaction, catalyzed by cellular mitochondrial enzymes, was proportional to the number of surviving cells.
They also show that, when the sulfur content was over a certain level, ferrite (α-Fe) side plates would grow from the grain boundaries and lower the ratio of the austenite phase.
Widmanstätten (acicular ferrite) is usually formed in the interior of the original austenitic grains by direct nucleation from the inclusions, which is very likely to be created in high sulfur steel.
The Nitrogen/Oxygen content was measured by LECO TC1366 inert gas fusion analyzer and Carbon/Sulfur content was measured by HORIBA non dispersive infrared gas analyzer. 2.6 Cell toxicity sample preparation The high nitrogen stainless steel samples were cut by an electrode-discharge wire cutter to about 5 mm × 3 mm × 1 mm and ground by abrasive with grain sizes #1000.
The rate of this reaction, catalyzed by cellular mitochondrial enzymes, was proportional to the number of surviving cells.
They also show that, when the sulfur content was over a certain level, ferrite (α-Fe) side plates would grow from the grain boundaries and lower the ratio of the austenite phase.
Widmanstätten (acicular ferrite) is usually formed in the interior of the original austenitic grains by direct nucleation from the inclusions, which is very likely to be created in high sulfur steel.
Online since: January 2013
Authors: L.J. Wang, B.B. Liang, Y. Li, L.L. Xu, W. Jiang
As a nanocomposite phase, graphene provided plenty of charge carriers and active sites for nucleation of Bi0.5Sb1.5Te3 grains.
In contrast, graphene as a support material could supply a large number of active sites for nucleation of Bi0.5Sb1.5Te3, which increased the dispersion of Bi0.5Sb1.5Te3.
Meanwhile, the decrease of grains size increased the grain boundary, which contributed to the decrease of thermal conductivity.
Compared with pure Bi0.5Sb1.5Te3, it possesses better dispersity and smaller grains size.
In contrast, graphene as a support material could supply a large number of active sites for nucleation of Bi0.5Sb1.5Te3, which increased the dispersion of Bi0.5Sb1.5Te3.
Meanwhile, the decrease of grains size increased the grain boundary, which contributed to the decrease of thermal conductivity.
Compared with pure Bi0.5Sb1.5Te3, it possesses better dispersity and smaller grains size.
Online since: February 2018
Authors: Zheng Zhi Zhao, Ai Min Zhao, Yi Wu, Qiu Qin Fu, Hong Xiang Yin
The grains near the {111} < 112 > orientation grew up selectively.
The black rod-shaped morphology inside the grain is copper precipitated phase, While the white location is the area which the copper precipitated phase falling off.
With the naked eye, there is no copper precipitation in the grain.
As the temperature rises, the number of precipitation decreases.
Fig. 7 shows the grain orientation line analysis of the tested steel with different annealing temperature.
The black rod-shaped morphology inside the grain is copper precipitated phase, While the white location is the area which the copper precipitated phase falling off.
With the naked eye, there is no copper precipitation in the grain.
As the temperature rises, the number of precipitation decreases.
Fig. 7 shows the grain orientation line analysis of the tested steel with different annealing temperature.
Online since: December 2012
Authors: Yan Yan Jiang, Qing He Han, Hao Wen Yang, Zhiqiang Hu, Yang Yang Jing, Wen Yuan Gao, Jian Bo Liu
The results show that the powders calcined at 800℃ for 3h were high pure perovskite state and the position of XRD spectra diffraction peak of the cathode materials shifts to the small angle and the grain size of the powders is getting larger with increasing the content of Fe-doped.
Results and discussion 2.1 Phase and microstructure analysis of La0.7Sr0.15Ca0.15Co1-xFexO3-δ Fig.1 XRD patterns of La0.7Sr0.15Ca0.15Co1-xFexO3-δ powder(x=0.1,0.2,0.3,0.4) at 800 ℃ Fig.2 SEM photograph of La0.7Sr0.15Ca0.15Co0.8Fe0.2O3-δ powders The XRD patterns in Fig.1show that all four La0.7Sr0.15Ca0.15Co1-xFexO3-δ (x=0.1,0.2,0.3,0.4) samples ,treated at 800 ℃ for 3 h are perovskite structure,show that common doped Sr2+ ‚Ca2 + and single doped Fe3+ have entered the lattice- crystal of LaCoO3,and form the crystallology.with increasing x, XRD diffraction peak figure doesn’t change much the location, that is the main phase of perovskite structure doesn’t change, but the diffraction peak position shifts to small angles and the grain size of cathode powder gradually becomes larger,that is because ionic radius of Fe3+ is (0.65À),larger than that of Co3+( 0.61À)and of Co4+(0.59À), therefore, with increasing Fe-doped, the grain size of cathode
Meanwhile, with the content of Fe-doped increasing , the ability of forming the Co4+-O-Co3+ small polaron of cathode is decreased , the number of small polaron and double exchange are also reduced[2], therefore, the cathode ohmic polarization is also larger.The electrical conductivity of cathode decreases with Fe-doped increasing can be further explained by the structure of perovskite.
When the amount of Fe-doped increasing from 0.1 to 0.4,t decreases from 0.9722to 0.9664,further deviated from t=1.0 the ideal structure of perovskite,that leads the deformation of lattice and the grain size of cathode powder to be larger , the conductivity of cathode and the activity of the cathode powder to be decreased.
Results and discussion 2.1 Phase and microstructure analysis of La0.7Sr0.15Ca0.15Co1-xFexO3-δ Fig.1 XRD patterns of La0.7Sr0.15Ca0.15Co1-xFexO3-δ powder(x=0.1,0.2,0.3,0.4) at 800 ℃ Fig.2 SEM photograph of La0.7Sr0.15Ca0.15Co0.8Fe0.2O3-δ powders The XRD patterns in Fig.1show that all four La0.7Sr0.15Ca0.15Co1-xFexO3-δ (x=0.1,0.2,0.3,0.4) samples ,treated at 800 ℃ for 3 h are perovskite structure,show that common doped Sr2+ ‚Ca2 + and single doped Fe3+ have entered the lattice- crystal of LaCoO3,and form the crystallology.with increasing x, XRD diffraction peak figure doesn’t change much the location, that is the main phase of perovskite structure doesn’t change, but the diffraction peak position shifts to small angles and the grain size of cathode powder gradually becomes larger,that is because ionic radius of Fe3+ is (0.65À),larger than that of Co3+( 0.61À)and of Co4+(0.59À), therefore, with increasing Fe-doped, the grain size of cathode
Meanwhile, with the content of Fe-doped increasing , the ability of forming the Co4+-O-Co3+ small polaron of cathode is decreased , the number of small polaron and double exchange are also reduced[2], therefore, the cathode ohmic polarization is also larger.The electrical conductivity of cathode decreases with Fe-doped increasing can be further explained by the structure of perovskite.
When the amount of Fe-doped increasing from 0.1 to 0.4,t decreases from 0.9722to 0.9664,further deviated from t=1.0 the ideal structure of perovskite,that leads the deformation of lattice and the grain size of cathode powder to be larger , the conductivity of cathode and the activity of the cathode powder to be decreased.
Online since: August 2020
Authors: Tuan Anh Nguyen, Ky Phuong Ha Huynh, Thi Yen Mai, Truong Xuan Minh Nguyen, Minh Vien Le, T. Anh Nga Nguyen
There is an optimal milling time of 60 minutes in order to obtain ZnO nanoparticles with the smallest average grain size.
Therefore, zinc oxide nanoparticles show a number of interesting properties and have been applied in various fields, such as sensors, photocatalyst, pigments, optical materials, and additives [3].
The full experimental design matrix and the results of the mean grain sizes are shown in Table 2.
It was found that 60 minutes is an optimal milling time in order to obtain ZnO nanoparticles with the smallest average grain size.
The average grain sizes of the obtained ZnO nanoparticles were less than 40 nm, which was confirmed by both XRD pattern and SEM micrograph.
Therefore, zinc oxide nanoparticles show a number of interesting properties and have been applied in various fields, such as sensors, photocatalyst, pigments, optical materials, and additives [3].
The full experimental design matrix and the results of the mean grain sizes are shown in Table 2.
It was found that 60 minutes is an optimal milling time in order to obtain ZnO nanoparticles with the smallest average grain size.
The average grain sizes of the obtained ZnO nanoparticles were less than 40 nm, which was confirmed by both XRD pattern and SEM micrograph.
Online since: August 2018
Authors: Olexiy A. Balitskii, Bohdan Koman, Volodymyr Yuzevych
Kinetics of internal stresses were recorded as a function of film thicknesses σі(d) for a number of deposition rates at the room temperature.
The other models describing ISs also take into account stresses at the pre-coalesce stage, structural imperfections, surface disorder, grains growth and grains boundary formation, insertion of atoms at the latter, relaxation, and impurities [20-21].
Thus the substructure (grain sizes) of condensates is responsible for the intrinsic stresses and values of sn1.
For the layer with the biggest grains such changes are equal to 35 %.
So changes of interface energy are strictly size dependent and are mainly driven by copper grains interaction.
The other models describing ISs also take into account stresses at the pre-coalesce stage, structural imperfections, surface disorder, grains growth and grains boundary formation, insertion of atoms at the latter, relaxation, and impurities [20-21].
Thus the substructure (grain sizes) of condensates is responsible for the intrinsic stresses and values of sn1.
For the layer with the biggest grains such changes are equal to 35 %.
So changes of interface energy are strictly size dependent and are mainly driven by copper grains interaction.
Online since: November 2013
Authors: Mohd Zainizan Sahdan, Nor Diana Mohd Ariffin, Nurulnadia Sarip, Siti Nooraya Mohd Tawil
Having the narrow band gap of 1.2 eV, this copper oxide-based material comprises of a number of unique properties, namely the magnetic, electrical and optical properties [1].
Therefore, from the calculation we can conclude that theoretically the grain size is inversely proportional to the increase in O2 gas flow rate.
O2 flow rate (kPa) Grain size, GS (nm) 5 13.5 6 12.0 7 11.1 10 11.0 Morphological analysis of CuO thin film.
Fig. 3(a) reveals that at 5 kPa, large amount of oxide grains with inhomogeneous size and agglomerated CuO structures are formed.
Exposed Cu sheet are heated at elevated temperature of 400° C in O2 gas (5 kPa – 10 kPa flow rates) makes subsequent nucleation possible, resulting in a homogeny CuO grain particles with grain gaps in between the neighbouring particles formation.
Therefore, from the calculation we can conclude that theoretically the grain size is inversely proportional to the increase in O2 gas flow rate.
O2 flow rate (kPa) Grain size, GS (nm) 5 13.5 6 12.0 7 11.1 10 11.0 Morphological analysis of CuO thin film.
Fig. 3(a) reveals that at 5 kPa, large amount of oxide grains with inhomogeneous size and agglomerated CuO structures are formed.
Exposed Cu sheet are heated at elevated temperature of 400° C in O2 gas (5 kPa – 10 kPa flow rates) makes subsequent nucleation possible, resulting in a homogeny CuO grain particles with grain gaps in between the neighbouring particles formation.
Online since: October 2011
Authors: M.A. Abdel-Rahman, E.M. Hassan, Basma A.A. Balboul
Titania (TiO2) nanocrystalline powders have been commercially available in a number of forms, the most important of which are anatase and rutile phases.
Thus, the increase in τ1-value may be attributed to positron trapping at the Ti3+ vacancy clusters at the grain boundaries for the anatase TiO2 samples.
Upon further annealing, the grain size increases, resulting in a larger crystalline volume fraction and a lower density of interface/grain boundary; this hence, results in decrease in the observed lifetime.
The XRD spectra of TiO2 were utilized to determine the d-space, relative intensities (I/I°) and grain sizes of the phases present in the sample.
The grain size curve can be utilized as a calibration curve for determination of the Ds if we know SSA value and vice versa for TiO2 samples. 4.
Thus, the increase in τ1-value may be attributed to positron trapping at the Ti3+ vacancy clusters at the grain boundaries for the anatase TiO2 samples.
Upon further annealing, the grain size increases, resulting in a larger crystalline volume fraction and a lower density of interface/grain boundary; this hence, results in decrease in the observed lifetime.
The XRD spectra of TiO2 were utilized to determine the d-space, relative intensities (I/I°) and grain sizes of the phases present in the sample.
The grain size curve can be utilized as a calibration curve for determination of the Ds if we know SSA value and vice versa for TiO2 samples. 4.