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The low-lying excited Electronic States of an Alkali-Earth Compounds Mahmoud Koreka*, Hadeel Razzoukb, Rasha Abou Arkoubc, and Sara El Atwanid Faculty of Science, Beirut Arab University, P.O.Box 11-5020 Riad El Solh, Beirut 1107 2809, Lebanon.
Mestdagh et al., Chemical Physics Letters, 471, (2009), 22

El Batal, N.
El Batal, A.A.
El-Alaily, F.
El-Konsol, M.A.
El-Konsol, M.A.

XRD patterns of (a) pure Al, (b) Al-0.5vol.
%SiC and (c) Al-1.5vol.
SEM micrographs of extruded (a) pure Al, (b) Al-0.5vol.
%SiC and (c) Al-1.5vol.
El-Kady and A.

References [1] El-Kamash A.M., El-Naggar M.R., El-Dessouky M.I.: J.
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El Diwani, Sh.
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Frazier and E.L.

El-Fadel, M., A.N.
El-Fadel, M., A.N.
El-Fadel, M., A.N.
El-Fadel, M., A.N.
El-Fadel, M., et al., Comparative assessment of settlement models for municipal solid waste landfill applications.

The studies by Sastry et al. [8] and Sankaran et al. [9] in Al-Li-Co, Al-Li-Zr, and Al-Li-Ti alloys fabricated by rapid solidification process have demonstrated that it is possible to refine grain by RSP and to improve the ductility by dispersoids such as Al3Ti and Co2Al.
Experimental Procedure The different alloy compositions used in this study were prepared using high purity Al (99.99%), Li (99.99%), Cu (99.9%), Mg (99.9%), Ag (99.9%), Al-5%Zr and Al-5%Mn master alloys.
The hardness decrease for early aging, that is, the quench hardening, observed at 150 or 180 oC has been scarcely observed in general high strength Al alloys but has previously been reported by Pickens et. al. in high-Cu Al alloys [1].
Fig. 5 SEM fractographs of tensile fractured, (a) 0Mn alloy aged for 24 hours and (b) 0.6Mn alloy aged for 12 hours at 180 oC. 0 20 40 60 80 100 200 300 400 500 600 5 10 15 20 25 30 0% Mn TS 0% Mn YS 0.6% Mn TS 0.6% Mn YS Strength (MPa) Aging Time (hrs) 0% Mn El 0.6% Mn El Elongation (%) Fig. 6 Strength and elongation of 0Mn and 0.6Mn alloys aged at 180 oC with aging time. 0 3 6 9 12 15 450 500 550 600 650 � this study commercial alloys 1.2Mn 2090-T851 0.3Mn 7075-T651 0.6Mn 0Mn 8090-T851 Tensile Strength (MPa) Elongation at Fracture (%) 2024-T851 2020-T651 Fig. 7 Strength versus elongation at fracture for present alloys and other commercial Al alloys The strength and elongation of the present alloys and other commercial alloys are plotted in Fig. 7.
Al-Li Conf., ed.

El Centro wave (Fig. 4) is used as horizontal seismic excitation propagating vertically from the bedrock.
The response spectrum of El Centro wave is shown in Fig. 5.
Li, et al, Rock and Soil Mechanics, Vol.22 2 (2001) 138
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Tsai, et al, A computer program for approximate 3-D analysis of soil-structure interaction problems, EERC 75-30, Earthquake Engineering Research Center, University of California, Berkeley, 1975.

For instance, Storasta et al. assume a pseudodonor character of the the D1 defect, that is associated with a hole trap at 0.34 eV above the valence band [28].
Furthermore, Kimoto et al. [24] suggested that the known defect EH6/7 (EC-1.55 eV) couldFig. 4: Recorded spectra of electroluminescence measurements from a pulsed MOSFET test structure at cryogenic and room temperature and the spectrum of a different SiC diode biased in forward direction at room temperature.
Photon emission around 1.8 eV has also been reported in earlier work [21, 23, 29] measuring thermal stimulated luminescence (TSL) and photoluminescence attributing it to aluminum (Al) as a hole trap or the PbC center.
Different luminescence measurements methods (L) such as photoluminescence (PL), photoexcitation (PE), thermally stimulated luminescence (TSL), thermoluminescence (TL), electroluminescence (EL), chathodoluminescence (CL) and photo stimulated tunneling (PST) are used.
Peak [eV] L Source Classification 1.82 PL [29] O-band / O-defect 1.8 PE [31] PbC -/0 1.8 TSL [23] Al as hole trap 1.77 TL [21] related to Al or B and following recombination 2.554 EL [17] defect electroluminescence (DEL) via N and the i-center 2.583 EL [18] fast processes of trap filling and free-carrier recombination 2.455 EL [19] EK2 donor - D acceptor transition 2.455 PL [16] DAP transition 2.6 EL [32] radiative recombination involving the HK1 deep center 2.557 EL [20] recombination via Z1/2 (EC-0.63eV) 2.583 CL [22] DAP (N and Al/B) or recombination via Z1/2 2.750 CL [27] oxygen related emission 2.77 PST [1] intrinsic SiO2 defect 2.9 PL [14],[...]

Alberts et al. [21] reported a 66.8% degrading of AFB1 during 72 h incubation with R. erythropolis.
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El-Nezami, P.
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Food Microbiol., Vol. 109 (2006) No.1-2, p. 121 [22] El Khoury, A.