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Online since: January 2016
Authors: Nathalie Guichard, Françoise Immel, Frédéric Marin, Alexandre Parker, Cédric Broussard
It is remarkable to observe that the third bleaching treatment (histogram T0 (III)) performed on the sieved powder (grains below 200 µm) has a drastic effect on the quantity of materials extracted: about three-quarter of the matrix is degraded by sodium hypochlorite, by comparing the values obtained for T0 (II) and T0 (III).
Note the general tendency to the reduction of the number of identified proteins (except T7) and to the reduction of the number of identified peptides per protein (right column). 4.
We have shown by the ‘weighing approach’ and by proteomics that the third bleaching treatment, performed on the sieved nacre powder (grain size < 200 µm), induces a drastic loss of matrix, in particular the insoluble one.
It is very likely that the grain size influences the final results: by supposing that we could work with very small sieved grains (< 67 µm), the bleaching would probably destroy completely the intercrystalline matrix, leaving intact the intracrystalline components.
The proteomic approach, performed on the insoluble fraction (AIM), tends to confirm this tendency: there is a clear decrease of the number of identified proteins, which suggests their progressive degradation by the thermal treatment.
Note the general tendency to the reduction of the number of identified proteins (except T7) and to the reduction of the number of identified peptides per protein (right column). 4.
We have shown by the ‘weighing approach’ and by proteomics that the third bleaching treatment, performed on the sieved nacre powder (grain size < 200 µm), induces a drastic loss of matrix, in particular the insoluble one.
It is very likely that the grain size influences the final results: by supposing that we could work with very small sieved grains (< 67 µm), the bleaching would probably destroy completely the intercrystalline matrix, leaving intact the intracrystalline components.
The proteomic approach, performed on the insoluble fraction (AIM), tends to confirm this tendency: there is a clear decrease of the number of identified proteins, which suggests their progressive degradation by the thermal treatment.
Online since: August 2015
Authors: N.J.S Ahmed, A.A.A.A Al-Rashed, I.A. Badruddin, S. Kamangar, Ghulam Abdul Quadir, H.M.T. Khaleed
It is found that the Nusselt number for fluid, solid phases as well as total Nusselt number initially decreases and the increases along the length of heater.
This figure is obtained at where Ra and Rr are Rayleigh number and radius ratio respectively.
Figure 1 shows the variation of Nusselt number for 3 lengths of the heater and 2 values of aspect ratio i.e.
The fluid Nusselt number is higher towards bottom side and solid Nusselt number is higher near the top edge of heater.
It is found that the Nusselt number is higher at two edges of heater for all the 20%, 35% and 50% heater length.
This figure is obtained at where Ra and Rr are Rayleigh number and radius ratio respectively.
Figure 1 shows the variation of Nusselt number for 3 lengths of the heater and 2 values of aspect ratio i.e.
The fluid Nusselt number is higher towards bottom side and solid Nusselt number is higher near the top edge of heater.
It is found that the Nusselt number is higher at two edges of heater for all the 20%, 35% and 50% heater length.
Online since: March 2007
Authors: Knut Marthinsen, Zacharias J. Lok, Sybrand van der Zwaag, A. Miroux
During subsequent breakdown
rolling the dispersoid number-density increases significantly.
This limited number of integrated models is due to the complexity of modelling the microstructure evolution.
Every sub-model needs first to be validated independently and subsequent coupling should be performed in a consistent way through a limited number of physical parameters.
In the homogenised material constituent particles are clusters of parallel needles located in the grain or cell boundaries [4].
SEM and TEM observations reveal two kinds of dispersoids that have formed during homogenisation in the grain interior: large, thin plate-like and small polyhedral dispersoids.
This limited number of integrated models is due to the complexity of modelling the microstructure evolution.
Every sub-model needs first to be validated independently and subsequent coupling should be performed in a consistent way through a limited number of physical parameters.
In the homogenised material constituent particles are clusters of parallel needles located in the grain or cell boundaries [4].
SEM and TEM observations reveal two kinds of dispersoids that have formed during homogenisation in the grain interior: large, thin plate-like and small polyhedral dispersoids.
Online since: June 2011
Authors: Jie Weng, Xiao Ying Lu, Bao Hua Wu, Tian Qiu, Jie Yu Liu
A number of multi-walled CNTs with the diameter of 25~40 nm and 15~25 nm can be produced from the matrix with initial Ca/P molar ratio of 1.5 and 1.625, respectively, while no CNTs can be grown from the matrix with initial Ca/P molar ratio of 1.67.
It can be seen from SEM observation that the resulted powders prepared with Ca/P molar ratio of 1.5 and 1.625 are constituted of certain amount of fibers with diameter of several tens of nanometer (the white arrows in Fig.1a and 1b) and a large number of aggregates of rounded particles, while the resulted powder prepared with Ca/P molar ratio of 1.67 is only composed of aggregates of rounded particles by a way of bottleneck link (Fig.1c).
Furthermore, amount of amorphous carbon are detected among the CaP grains in the three samples.
A great number of CaP grains with spherical shape and certain amount of amorphous carbon are discovered in this as-obtained powder.
A number of multi-walled CNTs with the diameter of 25~40 nm and 15~25 nm can be produced from the matrix with initial Ca/P molar ratio of 1.5 and 1.625, respectively, while no CNTs can be grown from the matrix with initial Ca/P molar ratio of 1.67.
It can be seen from SEM observation that the resulted powders prepared with Ca/P molar ratio of 1.5 and 1.625 are constituted of certain amount of fibers with diameter of several tens of nanometer (the white arrows in Fig.1a and 1b) and a large number of aggregates of rounded particles, while the resulted powder prepared with Ca/P molar ratio of 1.67 is only composed of aggregates of rounded particles by a way of bottleneck link (Fig.1c).
Furthermore, amount of amorphous carbon are detected among the CaP grains in the three samples.
A great number of CaP grains with spherical shape and certain amount of amorphous carbon are discovered in this as-obtained powder.
A number of multi-walled CNTs with the diameter of 25~40 nm and 15~25 nm can be produced from the matrix with initial Ca/P molar ratio of 1.5 and 1.625, respectively, while no CNTs can be grown from the matrix with initial Ca/P molar ratio of 1.67.
Online since: April 2004
Authors: Tetsuo Shoji, Q.J. Peng
Moreover, the role of DH in PWSCC is still
controversial, and several mechanisms, such as film-rupture/oxidation, hydrogen-assisted
cracking, internal oxidation and creep-assisted grain boundary rupture [4, 10-11], have been
proposed for interpretation.
Twins were found inside the grains.
The grain size varies from several tens of micrometers to about one hundred micrometers. 2.2 Environment, Facilities and the Procedure for the Tests Tests were performed in simulated PWR primary water, and the test conditions are listed in Table 2.
Because continuous IGSCC was almost produced somewhere on the fracture surface from test 2-2, the exact number of local IGSCC could not be evaluated and only an approximately number was listed for this test.
Test 1 Test 2-1 Test 2-2 Amount of local IGSCC 19 22 > 45 Maximum SCC length ~117µm ~128µm ~174µm It can be seen in Table 4 that the maximum number of IGSCC facets were produced during test 2-2 at DH~ 10ml/kg water STP.
Twins were found inside the grains.
The grain size varies from several tens of micrometers to about one hundred micrometers. 2.2 Environment, Facilities and the Procedure for the Tests Tests were performed in simulated PWR primary water, and the test conditions are listed in Table 2.
Because continuous IGSCC was almost produced somewhere on the fracture surface from test 2-2, the exact number of local IGSCC could not be evaluated and only an approximately number was listed for this test.
Test 1 Test 2-1 Test 2-2 Amount of local IGSCC 19 22 > 45 Maximum SCC length ~117µm ~128µm ~174µm It can be seen in Table 4 that the maximum number of IGSCC facets were produced during test 2-2 at DH~ 10ml/kg water STP.
Online since: May 2014
Authors: Hrusikesh Nath, Gandham Phanikumar
Number of heating and cooling cycles were performed to obtain the desired undercooling.
The second bf-image in Fig.3c shows a thick and clearly distinct grain boundary between γ-phase and austenite.
SAED pattern was taken from both the sides of grain boundary and shown in Fig.3(d, f).
That gives information about the solidification texture in the material due to limited number of grains in the microstructure [21].
The number of Fe-atoms is higher than Ga-atoms which increases the exchange interaction and consequently the magnetic moment.
The second bf-image in Fig.3c shows a thick and clearly distinct grain boundary between γ-phase and austenite.
SAED pattern was taken from both the sides of grain boundary and shown in Fig.3(d, f).
That gives information about the solidification texture in the material due to limited number of grains in the microstructure [21].
The number of Fe-atoms is higher than Ga-atoms which increases the exchange interaction and consequently the magnetic moment.
Online since: May 2010
Authors: J.R. Gao, G. Luo, X.H. Luo
A large number of peritectic systems have been
investigated with respect to phase selection so far [3-10].
In the present work, a number of methods such as electromagnetic levitation and substrate quenching were used in an attempt to enhance the undercooling of Cu-Ge alloys.
The chilled zone near the substrate showed a segregation-free microstructure, which consisted only of equiaxed grains of the ζ-Cu5Ge phase.
However, the upper zone showed a segregated microstructure, which consisted of primary α-Cu dendrites and peritectic ζ-Cu5Ge grains.
Financial support from the Ministry of Education, China under grant number NCET 05-0292 is gratefully acknowledged.
In the present work, a number of methods such as electromagnetic levitation and substrate quenching were used in an attempt to enhance the undercooling of Cu-Ge alloys.
The chilled zone near the substrate showed a segregation-free microstructure, which consisted only of equiaxed grains of the ζ-Cu5Ge phase.
However, the upper zone showed a segregated microstructure, which consisted of primary α-Cu dendrites and peritectic ζ-Cu5Ge grains.
Financial support from the Ministry of Education, China under grant number NCET 05-0292 is gratefully acknowledged.
Online since: April 2016
Authors: Vladimír Racko, Blazej Seman, Olga Misikova, Igor Cunderlik
Juvenile wood has lower density, higher moisture content a lower proportion of latewood, shorter tracheids with thinner cell walls and larger lumens, larger microfibrillar angle, frequent occurrence of spiral grain, lower cellulose content, higher lignin content (more than 9 %) and a larger amount of compression wood opposite to mature wood [1].
Table 1 Macroscopic characteristics of NGR in JW Number of growth rings from the pith Average width of growth rings [mm] Proportion of latewood [%] 1-5 3.91 ± 0.21 13.4 6-10 2.48 ± 0.17 32.9 11-15 2.00 ± 0.11 39.3 Literature indicates different width of the annual rings and proportions of JW.
In marginal zones of IGRs Picea abies increased the number of rays by 40 to 50 %, but the cell number of a ray in tangential section was diminished by 10 to 20 % [23].
Gotze, Abnormal wood structure: 'Hazel grain' and wavy grain, Wood Research, 111 (1986) 1-10
Table 1 Macroscopic characteristics of NGR in JW Number of growth rings from the pith Average width of growth rings [mm] Proportion of latewood [%] 1-5 3.91 ± 0.21 13.4 6-10 2.48 ± 0.17 32.9 11-15 2.00 ± 0.11 39.3 Literature indicates different width of the annual rings and proportions of JW.
In marginal zones of IGRs Picea abies increased the number of rays by 40 to 50 %, but the cell number of a ray in tangential section was diminished by 10 to 20 % [23].
Gotze, Abnormal wood structure: 'Hazel grain' and wavy grain, Wood Research, 111 (1986) 1-10
Online since: January 2010
Authors: Zhong He Shui, Xiao Yan Wang, Jing Wang, Zhi Jiang Ji, Nan Ding, Hai Jian Li
The contrast TiO2 (CR-826, TRONOX, USA) used as
bactericidal test had average grain size of 0.2 µm, and all was rutile phase.
MIC experiments were performed at least by triplicate, with good reproducibility of results. 2.3 Observation of TiO2 Appearance and Interaction with E. coli The appearance and grain size of TiO2 were observed by transmission electron microscope (TEM, JEOL-2010, Japan).
In contrast, no decrease in the number of viable cells was observed in presence of every concentration of CR-826 TiO2.
The accumulated bright spot and similar shape of grain in Fig. 4 were a particle of nano-TiO2.
Acknowledgments: This research was supported by National Key Technology R&D Program of the Republic of China (Grant Number: 2006BAJ02A10-05 and 2006BAJ02A08-1).
MIC experiments were performed at least by triplicate, with good reproducibility of results. 2.3 Observation of TiO2 Appearance and Interaction with E. coli The appearance and grain size of TiO2 were observed by transmission electron microscope (TEM, JEOL-2010, Japan).
In contrast, no decrease in the number of viable cells was observed in presence of every concentration of CR-826 TiO2.
The accumulated bright spot and similar shape of grain in Fig. 4 were a particle of nano-TiO2.
Acknowledgments: This research was supported by National Key Technology R&D Program of the Republic of China (Grant Number: 2006BAJ02A10-05 and 2006BAJ02A08-1).
Online since: April 2014
Authors: Feng Wang, Yi Bin Yin, Hong Wei Liu, Xi Wu Li, Bai Qing Xiong, Zhi Hui Li, Yong An Zhang
After spreading and solidification, the liquid droplets show wide grain boundaries (Fig. 1c and 1d), and dendrite fragments display irregular little particles (Fig. 1e and 1f).
So the number of this type of porosity is little.
Interstices with little size may be linked with larger gas pores to form interconnected pores (Fig. 2d), which have irregular morphology for impingement from adjacent grains and smooth surface.
The number of interconnected pores between gas pores is not large.
The most common interconnected pores associated with solidification shrinkage are illustrated in Fig. 4a, 4b, 4c and 4d, which show long and narrow voids along grain boundaries.
So the number of this type of porosity is little.
Interstices with little size may be linked with larger gas pores to form interconnected pores (Fig. 2d), which have irregular morphology for impingement from adjacent grains and smooth surface.
The number of interconnected pores between gas pores is not large.
The most common interconnected pores associated with solidification shrinkage are illustrated in Fig. 4a, 4b, 4c and 4d, which show long and narrow voids along grain boundaries.