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Online since: April 2012
Authors: Jia Miao Ni, Qi Bin Gu
Dyamant et al.[2] studied glasses in the system SiO2–Bi2O3–ZnO–B2O3 and concluded that glass formation was obtained within the composition range of 40–60 mol% SiO2, 1–30 mol% B2O3, 10–45 mol% Bi2O3, and 1–35 mol% ZnO, with glass transition temperature (Tg) in the range of 411–522℃, which decreased with the increase of Bi2O3 content, and dilatometric softening point ranging from 453 to 563℃.
Kim, E.L.
Kim, E.L.
Online since: January 2009
Authors: K. Yahiaoui, A. Bendib, Tahar Kerdja, S. Malek
Malek1
1
Centre de Développement des Technologies Avancées DMIL-ILM, Cité 20 août 1956,
BP17, Baba Hassen, Alger, Algérie
2
Faculté de Physique, USTHB, BP23 El Alia Bab Ezzouar, Alger
e
email :tkerdja@cdta.dz
Keywords: Laser ablation, phase explosion, silicon, titanium, high laser intensity
Abstract.
(a) (b) (c) Fig. 2: SEM image of the crater produced by a single laser shot on silicon at (a) 4.2×109W.cm -2 (b) 5,10×1010W.cm -2 and (c) by ten laser shots at 5.10×10 10W.cm -2 (a) (b) (c) Fig. 3: SEM image of the crater produced on titanium (a)by a single laser shot at 4.65×109W.cm -2(b) by ten laser shots at 4.96×1010W.cm -2 and(c) by twenty laser shots at 4.96×1010W.cm -2 Zheng et al [11] have suggested that the velocity distribution of the expanding atoms in the plume is described by the theory of isentropic supersonic expansion, and according to this model, the velocity distribution is successfully fitted by the so-called center-of-mass Maxwell-Boltzmann (CMMB) distribution function.
(a) (b) (c) Fig. 2: SEM image of the crater produced by a single laser shot on silicon at (a) 4.2×109W.cm -2 (b) 5,10×1010W.cm -2 and (c) by ten laser shots at 5.10×10 10W.cm -2 (a) (b) (c) Fig. 3: SEM image of the crater produced on titanium (a)by a single laser shot at 4.65×109W.cm -2(b) by ten laser shots at 4.96×1010W.cm -2 and(c) by twenty laser shots at 4.96×1010W.cm -2 Zheng et al [11] have suggested that the velocity distribution of the expanding atoms in the plume is described by the theory of isentropic supersonic expansion, and according to this model, the velocity distribution is successfully fitted by the so-called center-of-mass Maxwell-Boltzmann (CMMB) distribution function.
Online since: August 2009
Authors: Tungwai Leo Ngai, Chang Xu Hu, Jun Jun Zheng, G.R. Pan, Yuan Yuan Li
Most of the warm compaction researches and applications
were concerning the iron-base materials; Ngai et al. applied the warm compaction technique in the
fabrication of copper and Cu-based metal matrix composite [12].
El-Raghy: J.
El-Raghy: J.
Online since: June 2018
Authors: Tatsuo Fujimoto, Noboru Ohtani, Kiyo Okawa, Hiroshi Tsuge, Kentaro Shioura, Yuina Mannen, Masakazu Katsuno, Shinya Sato
Similar shrinkage of SFs in heavily nitrogen-doped 4H-SiC crystals during high temperature annealing has also been reported by Fujie et al. [8].
El-Hinnawy, P.
El-Hinnawy, P.
Online since: March 2018
Authors: Gandi Sugandi, I Dewa Putu Hermida, Goib Wiranto, Wiendartun Wiendartun, Slamet Widodo, Roberth V. Manurung, Zaenal Arifin
This reaction can be described as
2H2O® O2 + 4H+ + 4e- (3)
According to McLaughlin et al [15], the dynamic performance of the device can be predicted by solving the diffusion equation using an applied voltage step, independent of the electrode size and geometry.
El.
El.
Online since: June 2014
Authors: José Filipe Bizarro de Meireles, Hugo Miguel Silva
Valdevit el al. studied the bending response of steel sandwich panels with corrugated cores subjected to bending loads, presenting relevant design variables for optimization processes [12].The need of using light and stiff structures balances the need of study of structural solutions based on sandwich geometries, involving in this case numerical analysis.
Online since: March 2008
Authors: L. Anicai, A. Pertache, M. Buda, T. Visan
-initial anodizing in 7.5-10M
HNO3, at 1-2 A/dm
2
for 5
minutes, at 25
oC
Al/Ag a.c.
Correspondingly, the corrosion current for Al/Mo system is six times higher than that evaluated for Al/NiMo one.
Figure 13 - Corrosion evolution during continuous immersion in 0.5 M NaCl It may be noticed according to Fig.13 that the best corrosion protection is offered by Al/Ni a.c. system, followed by Al/PPy and Al/PPy-TEOS ones.
Also, for these coatings there have been 0 500 1000 1500 2000 2500 3000 3500 4000 4500 0 -200 -400 -600 -800 -1000 -1200 -1400 -1600 -1800 -Zim [Ohm] Zre [Ohm] Al/PPy-TEOS, 24 h Al/PPy, 24 h Al/PPy-TEOS, 240 h Al/PPy, 240 h 0 5 10 15 20 25 30 coating corrosion, % 24 48 72 144 168 192 240 336 408 immersion period, hours NiMo NiMo-TEOS Mo PPy PPy-TEOS Ag c.a.
[7] M.F.Shaffei, S.S.Abd El-Rehim, N.A.Shaaban, H.S.Hisen, Renewable Energy Vol. 23 (2001), p.489
Correspondingly, the corrosion current for Al/Mo system is six times higher than that evaluated for Al/NiMo one.
Figure 13 - Corrosion evolution during continuous immersion in 0.5 M NaCl It may be noticed according to Fig.13 that the best corrosion protection is offered by Al/Ni a.c. system, followed by Al/PPy and Al/PPy-TEOS ones.
Also, for these coatings there have been 0 500 1000 1500 2000 2500 3000 3500 4000 4500 0 -200 -400 -600 -800 -1000 -1200 -1400 -1600 -1800 -Zim [Ohm] Zre [Ohm] Al/PPy-TEOS, 24 h Al/PPy, 24 h Al/PPy-TEOS, 240 h Al/PPy, 240 h 0 5 10 15 20 25 30 coating corrosion, % 24 48 72 144 168 192 240 336 408 immersion period, hours NiMo NiMo-TEOS Mo PPy PPy-TEOS Ag c.a.
[7] M.F.Shaffei, S.S.Abd El-Rehim, N.A.Shaaban, H.S.Hisen, Renewable Energy Vol. 23 (2001), p.489