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Online since: March 2019
Authors: Myagmar Otgonbaatar, Duger Ulam-Orgikh, Perenlei Tuvshintur, Goliminsee Shilagardi, Serguei A. Filatov, E.M. Shpilevsky
Currently, a number of areas have already been defined, in which materials containing fullerenes can withstand competition not only in quality but also in cost.
However, the solution contains fullerenes with different numbers of carbon atoms.
Secondly, since the volume of the C60 molecule is 14–16 times the volume of the metal atoms, when co-condensed, the introduction of the C60 molecules into the metal grains create large internal mechanical stresses in the metal crystal lattice. 3.2 Thermoelectric coefficients The temperature coefficient of electrical resistance in metal-fullerene films, depending on the fractional composition of the components, varies from positive (at a low fraction of C60) to negative.
Figure 1: Dependence of the change in the electrical resistance of the films on frequency, for different ratios of the components nTi /nC60: 1 – 680, 2 – 270, 3 – 140 Fig. 1 shows the dependence of the change in the electrical resistance of Ti-C60 films on the frequency, at various proportional ratios of Ti atoms to the number of C60 molecules.
However, the solution contains fullerenes with different numbers of carbon atoms.
Secondly, since the volume of the C60 molecule is 14–16 times the volume of the metal atoms, when co-condensed, the introduction of the C60 molecules into the metal grains create large internal mechanical stresses in the metal crystal lattice. 3.2 Thermoelectric coefficients The temperature coefficient of electrical resistance in metal-fullerene films, depending on the fractional composition of the components, varies from positive (at a low fraction of C60) to negative.
Figure 1: Dependence of the change in the electrical resistance of the films on frequency, for different ratios of the components nTi /nC60: 1 – 680, 2 – 270, 3 – 140 Fig. 1 shows the dependence of the change in the electrical resistance of Ti-C60 films on the frequency, at various proportional ratios of Ti atoms to the number of C60 molecules.
Online since: June 2019
Authors: Jana Boháčová, Jana Daňková, Lukáš Prochazka, Michal Pešata
In addition to cement, the temperature increases even on the individual grains of the aggregate used.
The number of storeys varies depending on the temperature and the type of operation and the height of the chimney.
If the flue gases are drawn through the liners, a larger number of inserts can be installed at the same time for each source or operation.
This solution offers a number of advantages, such as at the penetration of the aggressive substance condensation through the sleeve, is not directly affected the shank.
The number of storeys varies depending on the temperature and the type of operation and the height of the chimney.
If the flue gases are drawn through the liners, a larger number of inserts can be installed at the same time for each source or operation.
This solution offers a number of advantages, such as at the penetration of the aggressive substance condensation through the sleeve, is not directly affected the shank.
Online since: February 2022
Authors: Cui Liang, Jin Jun Tang, Chen Guang Xu
In the alloy system, the average bonding electron number of alloy elements can well reflect the stability of the alloy.
When more electrons are at lower energy, the number of bonding electrons increases, the interaction of valence electrons in the crystal increases, and the stability of the crystal will increase.
The average number of bonding electrons is calculated by integrating the electronic density of States, which is used to judge the stability of each compound in the alloy.
Based on the research results of strengthening and toughening, the characteristic microstructure corresponding to high performance is sought by studying the behavior of interface, especially grain boundary, regulation method and its synergistic effect with the second phase, Establish the optimization direction of characteristic performance and the best organization model.
When more electrons are at lower energy, the number of bonding electrons increases, the interaction of valence electrons in the crystal increases, and the stability of the crystal will increase.
The average number of bonding electrons is calculated by integrating the electronic density of States, which is used to judge the stability of each compound in the alloy.
Based on the research results of strengthening and toughening, the characteristic microstructure corresponding to high performance is sought by studying the behavior of interface, especially grain boundary, regulation method and its synergistic effect with the second phase, Establish the optimization direction of characteristic performance and the best organization model.
Online since: December 2006
Authors: Hye Jeong Park, Sung Sik Chang, Akira Sakai
The majority of observed features are composed of small size grains with similar spherical
shape (2 ~ 5 nm in diameter).
In addition the vibrational mode stemming from Sn metal at 203.7 cm -1, which has a low wave number shift of 4.4 cm-1 with FWHM of 22.3 cm-1, is also detected.
Sp- Sn shows a low wave number shift of 4.4 cm-1 and increase of FWHM.
Thus, the low wave number shift and peak broadening of sp-Sn may be caused by nanosize effects, as evidenced from TEM and STM (see Fig. 1).
In addition the vibrational mode stemming from Sn metal at 203.7 cm -1, which has a low wave number shift of 4.4 cm-1 with FWHM of 22.3 cm-1, is also detected.
Sp- Sn shows a low wave number shift of 4.4 cm-1 and increase of FWHM.
Thus, the low wave number shift and peak broadening of sp-Sn may be caused by nanosize effects, as evidenced from TEM and STM (see Fig. 1).
Online since: March 2011
Authors: Guo Feng Wang, K.H. Zhang, Shuang Lu, C.L. Hong
Methylene blue molecules can hardly drill through the close-grained surface of the coated paper.
In the experiment, along with the extending of time, the increasing rate of the number of dye spots decreased and at last it would keep stable(Fig.6).This was because the quantity of corrosion pits depend on the quantity of holes that fatigue damage could emerged in specific acoustic field.
We also tried to use plastic sticky tape to cover one surface of the test paper, only to find a significant decrease in the number of dye pits, and an increase of the number of bumps and folds on the surface of coated paper.
In the experiment, along with the extending of time, the increasing rate of the number of dye spots decreased and at last it would keep stable(Fig.6).This was because the quantity of corrosion pits depend on the quantity of holes that fatigue damage could emerged in specific acoustic field.
We also tried to use plastic sticky tape to cover one surface of the test paper, only to find a significant decrease in the number of dye pits, and an increase of the number of bumps and folds on the surface of coated paper.
Online since: June 2003
Authors: A. Opalińska, Donats Millers, Witold Łojkowski, Larisa Grigorjeva
The major number of studies was undertaken on nanocrystals embedded in a matrix [3, 6-7].
The average grain size (Φ) of nanocrystals was calculated from specific surface area data and density of zirconium oxide (5.6 g/cm3), assuming that the particles are spherical.
One can expect, that in the smallest size nanocrystals the number of perturbed luminescence centres is larger than in large size nanocrystals.
The large number of Pr 3+ is suggested to be bound at the nanocrystal surface in ZrO2:Pr.
The average grain size (Φ) of nanocrystals was calculated from specific surface area data and density of zirconium oxide (5.6 g/cm3), assuming that the particles are spherical.
One can expect, that in the smallest size nanocrystals the number of perturbed luminescence centres is larger than in large size nanocrystals.
The large number of Pr 3+ is suggested to be bound at the nanocrystal surface in ZrO2:Pr.
Online since: October 2010
Authors: Xiao Hua Jie, Zheng Xi Hu, Guo Hui Lu
Table 1 Relation between samples code and MWCNTs concentration in bath
sample number
MWCNTs concentration in bath(gL-1)
0#
0
1#
1
2#
2
3#
3
4#
4
Surface microhardness of the composite coatings was measured on an Akas Hardness Testing Machine (MVK-H3, Japan).
Fig.1 SEM images of coatings at different magnification (a) 1#, (b)2#, (c)3#, (d)4# at 20000 magnification ; (e)1# , (f)2#, (g)3#, (h)4#, (i) 0# at 1500 magnification From the comparisons of the above images, Pb-Sn alloy coating had a regular grains structure with clear boundaries, while the composite coatings possessed fine netlike structures with compact tissues.
Fig.3 Relation between friction coefficients and number of revolutions (a) load 100N (b) load 200N (c) load 300N (d) load 400N Fig. 4 suggests that whether the coatings had nanotubes or not, increase of applied load caused a much higher wear weight loss.
(2) The tribological properties of composite coatings not only depended on the number of CNTs in the coatings but also on the distribution state of the nano particles.
Fig.1 SEM images of coatings at different magnification (a) 1#, (b)2#, (c)3#, (d)4# at 20000 magnification ; (e)1# , (f)2#, (g)3#, (h)4#, (i) 0# at 1500 magnification From the comparisons of the above images, Pb-Sn alloy coating had a regular grains structure with clear boundaries, while the composite coatings possessed fine netlike structures with compact tissues.
Fig.3 Relation between friction coefficients and number of revolutions (a) load 100N (b) load 200N (c) load 300N (d) load 400N Fig. 4 suggests that whether the coatings had nanotubes or not, increase of applied load caused a much higher wear weight loss.
(2) The tribological properties of composite coatings not only depended on the number of CNTs in the coatings but also on the distribution state of the nano particles.
Online since: September 2011
Authors: Jia Zhi Ren, Guo Xin Jia, Qing Guo Feng, Yi Feng Zhang
Introduction
Drafting force has a final effect on the change of slow fiber to rapid fiber in drafting zone, so dynamic performance of drafting force has close relations with evenness of output fiber strand, affects the evenness, numbers of neps and thick-thin-place of yarn.
Raw material is 100% cotton, fiber linear density is 0.14tex,5% span fiber length is 33.96mm, effective length is 29.85mm, short fiber content under 12.7mm is 2.72%(W),cotton neps is 15 grain/g Experiment condition.
Spinning experiment is processed on FA502 spinning frame, ring type is PG1/2,diameter is 42mm; traveler type is OS, number is 3/0;spindle speed is 12000rpm;nip gauge is 3.0mm;drawing type is SKF plane drawing;spring impresses pressure on top-roller,front roller pressure is 160N/two-strand。
Drafting force come to biggest when draft multiple of back zone is 1.5, after that drafting force decreases with draft multiple increasing; at this stage, glide begin to happen between fibers, drafting force gradually drops with the number lessening of fiber in front-nip.
Raw material is 100% cotton, fiber linear density is 0.14tex,5% span fiber length is 33.96mm, effective length is 29.85mm, short fiber content under 12.7mm is 2.72%(W),cotton neps is 15 grain/g Experiment condition.
Spinning experiment is processed on FA502 spinning frame, ring type is PG1/2,diameter is 42mm; traveler type is OS, number is 3/0;spindle speed is 12000rpm;nip gauge is 3.0mm;drawing type is SKF plane drawing;spring impresses pressure on top-roller,front roller pressure is 160N/two-strand。
Drafting force come to biggest when draft multiple of back zone is 1.5, after that drafting force decreases with draft multiple increasing; at this stage, glide begin to happen between fibers, drafting force gradually drops with the number lessening of fiber in front-nip.
Online since: September 2017
Authors: Larisa A. Makrovets, Gennady G. Mikhailov
The injection of REE essentially refines cast steel grain [3, 4], and globularizes non-metallic inclusions in steel [4].
The cumulative effect of multicomponent rare-earth alloys has been pointed out in a significant number of papers on these issues [5].
The methodology of calculations includes a number of operations [9].
Design formulas of activities according to this theory were derived in the approximation of quadratic dependence of melt coordination number on the composition expressed in terms of the ionic content of cations [9].
The cumulative effect of multicomponent rare-earth alloys has been pointed out in a significant number of papers on these issues [5].
The methodology of calculations includes a number of operations [9].
Design formulas of activities according to this theory were derived in the approximation of quadratic dependence of melt coordination number on the composition expressed in terms of the ionic content of cations [9].
Online since: June 2013
Authors: Jaroslaw Piątkowski, Eva Tillová, Lenka Hurtalová, Mária Chalupová
Molten metal was before casting purified with salt AlCu4B6 and was not modified or grain refined.
The formation of phases should correspond to successive reactions during solidification with an increasing number of phases involved at decreasing temperature.
In view of the gray scale values in the SEM secondary electron images are higher (brighter) for the higher atomic number of the elements, phases containing Cu and/or Fe are brightest (Fig. 1b).
Silicon and aluminum are close in atomic number and sometimes are hard to distinguish.
The formation of phases should correspond to successive reactions during solidification with an increasing number of phases involved at decreasing temperature.
In view of the gray scale values in the SEM secondary electron images are higher (brighter) for the higher atomic number of the elements, phases containing Cu and/or Fe are brightest (Fig. 1b).
Silicon and aluminum are close in atomic number and sometimes are hard to distinguish.