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El-Taybany et al. reported that the use of ultrasonic vibration reduces the moment compared to conventional milling [5].
During UAD of Al 7075-T6 alloy Amini et al. found that the drilling torque decreases with ultrasonic vibration, and increasing the spindle speed [6].Y.
Ahmed et al. found that UAD produces smoother surface than CD in alumina workpiece [7].
El-Taybany, M.
El-Hofy: Experimantal Investigation of Ultrasonic-Assisted Milling of Soda Glass Using Factorial Design of Experiments," Procedia CIRP, vol. 58, pp. 381-386, 2017

El-Nashar, M.G.
El-Nashar, A.F.
Al-Hartomy, A.A.
Al-Ghamdi, S.A.F.
Al Said, N.

The % El. gradually decreased as the aging time increased, agreeing with the inverse relationship between strength and ductility. % elongation increased beyond 96 hours of aging where the strength began to drop substantially.
Mechanical properties of as-received Material Sample Hardness [BHN] 0.2% P.S [MPa] UTS [MPa] % El As-received Material 155 386 491 10.21% c.
Effect of aging time on a) UTS , b). 0.2% P.S, c). % El & d) Hardness for samples solutionised at 470ºC for 4 hrs. and 8 hrs. and aged subsequently at 120 ºC.
H.Loffler et al.[3] and M.Tanaka et al [14] have made a mention of PFZ formation in several 7XXX alloys.
The TEM results of this study were in agreement with the findings of Gang Sha et.al [15] & A.K.Mukhopadhyay et.al. [16].

El Mehtedi, L.
El Mehtedi, L.
El Mehtedi, S.
El Mehtedi, M.
Kheder, editors., Al Salt, Jordan, 2005 p.235.

El-Sinawi*1,a, Omar A.
Niesser et al [1] have reported a fundamental frequency of 14.7 kHz (after geometry adjustment).
El-Sinawi, PhD.
[9] El-Sinawi A.
El-Sinawi.

Ultimate tensile strength (UTS) and elongation (E.L.%) affected are affected by the SDAS [11, 15].
The Al-7 wt.% Si- 0.6 wt.% Mg (A357) alloys with different Ti additions were prepared from Al-11.6 wt.% Si-1.1 wt.% Mg and Al-5 wt.% Ti base alloys.
For the as-cast alloys, Ti addition causes a slight increase of the YS as compared with unrefined A357 alloy, while the UTS and E.L.% are nearly identical with that of the unrefined alloy, corresponding to the microstructural evolution of the as-cast alloys.
However, the UTS and E.L.% of the Ti refined alloys are nearly identical with that of the unrefined alloy, due to the similar values of their SDAS.
For the as-cast alloys, the YS of Ti refined alloys are slightly superior to that of the unrefined A357 alloy, while the UTS and E.L.% of them are nearly identical with that of the unrefined alloy, which corresponds to the microstructural evolution of the as-cast alloys.

[2] Zhou Hua, Wang Guojin, Fu Shaojun, et al.
[3] Wu Faquan, Liu Tong, Tang Xianliang, et al.
[7] Li Chaozheng, Shen Rong, Li Wei, et al.
[8] Li Weishu, Zhou Huoming, Chen Hua, et al.
[9] Dong Zerong, Zhao Hua, Huang Shijun, et al.

El-Sebaii et al.[7] designed a transient mathematical model of a single pass flat plate solar air heater.
El-Agouz[10, 11] and Mehrgoo et al.[12] also found that improving the temperature of feed water increased the productivity.
El-Sebaii and H.
El-Helaby, A.
El-Helaby, A.

Roelkens, at al., III-V/Si photonics by die-to-wafer bonding, Materials Today, vol. 10, no. 7-8 (July-August 2007), pp. 36-43
[14] Onur Fidaner, et al., GeSiGe Quantum-Well Waveguide Photodetectors on Silicon for the Near-Infrared, IEEE Photon.
[23] Shin-ichi Saito, et al., Silicon light-emitting transistor for on-chip optical interconnection, Appl.
[39] Massimo Gurioli, et al., Thermal escape of carriers out of GaAs/AlxGa1-xAs quantum-well structures, Phys.
[40] Xinwei Zhao, et al., Quantum confinement in nanometer-sized silicon crystallites, Phy.

Several wadis are famous for their activities during floods, such as Wadi El-Arish, Wadi Watir, and Wadi Feran in the Sinai Peninsula; Wadi Qena, Waid Asyuti, and Wadi Kharit in the Eastern Desert; and Wadi Al-Alb, Wadi Al Lith, Wadi Nu'man, Wadi Najran and Wadi El-Dawather in Saudi Arabia [ 6, 11, 17–20].
Al-Ghamdi, J.
Al-Alola, H.
Al-Alola, H.
Al-Amri, Arab.