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Modeling of imperfect members For modeling geometric imperfection, the suggestive method of Al.sheikh is accomplished in this paper [5-8].
[5] El-Sheikh, A.I., (1995), “Sensitivity of Space Trusses to Member Geometric Imperfections,” International journal Space Structures, Vol. 10, No. 2, pp 89-98
[6] El-Sheikh, A.I., (1997), “Effect of Member Length Imperfections on Triple-Layer Space Trusses,” International Journal of Engineering Structures, Vol. 19, No. 7, pp 540-550
[7] El-Sheikh, A.I., (2002), “Effect of Geometric Imperfections on Single-Layer Barrel Vaults,” International Journal of space structures, Vol. 17, No. 4, pp 271-283

Stöber et al. [6] reported a method for the preparation of monodisperse spherical silica by hydrolysis of tetraethyl orthosilicate in ethanolic medium in the presence of ammonia.
El-Sayed, and M.A.El-Sayed, Nanomedicine (London, U.K.) 2(5) (2007) 681-693
El-Sayed, Spectral properties and relaxation dynamics of surface plasmon electronic oscillations in gold and silver nanodots and nanorods, J.

References [1] Abd El Meguid, E.A. and Abd El Latif, A.A. .
[2] John Layer, Tom Adler, Rehan Ahmed, et al.
[4] Ibrahim, M.A.M., Abd El Rehim, S.S. and Hamza, M.M. .

.% C N S P Mn Si Al Ti 0.002 0.0029 0.004 0.002 0.16 0.008 0.019 0.072 The samples were austenitized at 1050°C for 2 hours and air cooled to the start rolling temperature (800°C and 700°C, respectively), then ferritic hot rolled to the required thickness by the setting passes and reduction rate, and the finish rolling temperatures of samples were all around 600°C.
Start rolling temperature / oC Reduction in ferrite region / % YS / MPa TS / MPa El / % n r 1 800 90 105 259 51 0.294 1.458 2 700 90 101 243 51 0.306 1.725 3 700 76 112 249 52 0.281 1.350 It can be seen that rolling temperature and reduction had great influence on the average plastic strain ratio r-value, but had less influence on yield strength (YS), tensile strength (TS), total elongation (El) and hardening index n-value.
With the decrease of start rolling temperature from 800°C to 700°C, the r-value increased, while YS, TS, El and n-value had little change, as seen in sample No.1 and No.2.

PQSA compensation study has been conducted on the monochrome elipsometer EL - 4 and Sentech elipsometer 400 at l = 633 [nm] and different angles of incident light beam.
Weight % O-K Na-K Mg-K Al-K Si-K Ca-K Ti-K Basic glass 47.79 11.72 1.84 0.24 32.64 5.53 WG 51.96 11.50 1.51 2.80 27.63 4.60 Fig.1.
The study on EL-4 ellipsometer shows that the layer deposited on the glass surface is of 59 – 61 thickness while measurement performed on the SEMTECH 400 ellipsometer indicates a layer thickness show in Table 2.
Refined glass layer thickness [nm] Ellipsometer WG Average std dev EL – 4 59 61 61 ~60 1.154 SEMTECH 400 61 60 61 ~60 0.577 Average 60 Heat treatment associated with heat-setting of the aluminium hydroxide (WG) compounds nanoparticles layer has determined reduction of stresses in the inner layers visible on the cross section to compare with similar values in the optical glass.

Yousif et al. [12].
El-Shekeil et al. [13].
Mutasher et al. [9] for kenaf/epoxy composite and Mohd Yuhazri et al. [15] for kenaf/polyester composite.
References [1] Y.A El-Shekeil, S.M.
El-Shekeil, S.M.

Fadli et al. (2017) have modified the method conducted by Cheng et al (2010) with substitution of PAM with polyethylene glycol (PEG) to increase the biocompatibility.
El-Nasr, H.M.
El-Hennawy, M.H.
El-Kereamy, A.
El-Yazid and A.S.

Archarya et al. [7] studied MHD effects with constant suction, constant heat flux on free convective mass transfer flow through a porous medium.
In the literature, Mohammadein and El-Shaer [25] and Pal et al. [26] started their investigation on mixed convective flows past a vertical plate by taking both variable permeability and uniform permeability into the account."
Nasser et al.[27] discussed variable fluid properties on unsteady MHD mixed convection flow with variable surface temperature for non-Newtonian fluid.
Nalinakshi et al.[29] extended Mohammadein and El-Shaer, Pal's work in a sparsely packed porous medium under the influence of variable fluid properties from a vertical heated plate.
Suresh Babu et al.[30] studied double diffusive mixed convection viscous flow over a vertical surface with variable properties.

During recent years, there has been an increasing interest in the structure and optical properties of erbium oxide in the glass systems for example Ramamoorthy et al
The effect of Tm3+ codoping on the near-infrared and upconversion emissions of of Er3+ in TeO2–ZnO–ZnF2 glasses also had been done by Miguel et.al, [14].
[6] Ghada E.El-Falaky, Osiris W.Guirguis, and Nadia S, Abd El-Aal, A.C Conductivity and relaxation dynamics in zinc – borate glasses, Material international. 22(2) (2012) 86-93
Ahmad, El Sayed Yousef, and El Sayed Moustafa, Dielectric properties of the ternary TeO2/ Nb2O5/ZnO glasses, Physica B. 371 (2006) 74-80
El-Hadi, Dielectric Properties Some Borate Glass, Jurnal Material Science Technology. 17(2) (2001) 278-282

Zhou et al.
Elsukov et al.
El.
Ikonen et al.
El.