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Yang et al [4,5] studied the steady state flow in rectangular microchannels and the transient aspects of EOF in a slit microchannel by solving the complete Poisson-Boltzmann equation and the Navier-Stokes equation under an analytical approximation for the hyperbolic sine function; Mala et al [6] studied flow behavior in parallel-plate microchannels; Bowen et al [7] studied electroviscous effets in charged capillaries and provided a numerical method to solve Boltzmann-Poisson equation.
Sarah et al [8] investigated the characteristics of electroosmotic flows (EOF) in rectangular microchannels using a finite difference numerical scheme.
Dutta et al. [9,10] studied the analytical solutions of time periodic EOF and thermal characteristics of mixed electroosmotic and pressure-driven microflows in two-dimensional straight channels.
References [1] Gad-el-Hak Mohamed: MEMS: Introduction and fundamentals, Taylor &Francis Group, LLC., (2006) [2] E.

References [1] Haiyan Mou, Fei Shen, Qingfeng Shi, et al: European Polymer Journal Vol. 48(2012), p. 857-865
[4] Rakesh Kumar Soni, Harjeet Singh, Krishna Dutt, et al: Journal of Polymer Research Vol. 77(2010), p. 411-427
[7] Song Zhang, Liwen Tang, Moran Sun, et al: Advanced Materials Research Vol. 476-478(2012), p. 2252-2255
El-Nashar, Nabila A.
[9] Yueyi Deng, Shijie Cheng, Dapeng Wang, et al: China Elastomerics Vol. 30(2007), p. 365-368.

Free Vibration Analysis of Symmetric Sandwich Beams IBNORACHID Zakaria1,a*, El BIKRI Khalid1,b and BOUTAHAR Lhoucine1,c 1Mohammed V University in Rabat, Ecole Normale Supérieure de l'Enseignement Technique de Rabat, Département de génie mécanique, LaMIPI, B.P. 6207, Rabat Instituts, 10100 Rabat, Morocco azakaria.ibnorachid@um5s.net.ma, bk.elbikri@um5s.net.ma,clhoucine.boutahar@um5s.net.ma Keywords: Linear vibration, Sandwich, Shear deformation, Timoshenko zig-zag model.
Results ω1(Hz) ω2(Hz) ω3(Hz) ω4(Hz) ω5(Hz) S.M.R.Khalili [4, 5] 34.606 93.117 177.166 282.764 406.242 Sakiyama et al [2] 33.563 90.364 172.07 274.91 395.42 Howson and Zare [3] 34.596 93.100 177.155 282.784 406.325 Present study 34.543 93.154 177.123 282.79 406.280 Table 4 Natural frequencies for C-C.
Results ω1(Hz) ω2(Hz) ω3(Hz) ω4(Hz) ω5(Hz) S.M.R.Khalili [4,5] 57.123 219.422 464.565 766.850 1104.526 Sakiyama et al [2] 56.159 215.820 457.220 755.050 1087.900 Howson and Zare[3] 57.135 219.585 465.172 768.177 1106.680 Present study 57.382 208.191 437.298 721.765 1041.442 The first six linear normalized modes of transversal displacement is plotted in the following Fig.3.

El Harfi, Effects of acid treatments on Moroccan Tarfaya oil shale and pyrolysis of oil shale and their kerogen, J.
El Harfi, Study of the kinetics and mechanisms of thermal decomposition of Moroccan Tarfaya oil shale and its kerogen, Oil Shale 25(4) (2008) 426-443
Al-Harahsheh, O.
Al-Ayed, J.
Al-Harahsheh, K.

Fig. 2(a) depicts the electroluminescence (EL) spectrum of QDash showing fine structures from different confined energy subbands that are well correlated to different lasing peaks with varying cavity length.
Gmachl et al, Nature Vol. 415 (2002), p.883
Djie et al., IEEE Photon.
Somers et al., Appl.
Markus et al., Appl.

Various reaction parameters such as reaction temperature and Al/Cr ratio were investigated in detail.
Elemental analyses were carried out using Vario EL 111.
Increasing the Al/Cr molar ratio from 500 to 2000 leads to a slight increase of catalytic activity firstly which then tend to plateau.
Qian and Xie et al found that introducing fluoro groups into β-diiminato or β-ketoiminato titanium complexes can greatly increase the catalytic activities in comparison with that having alkyl ones[7,8].
Incarvito, A.L.

Prasad Rao et al. [6] found that the shell model, shell and the beam coupling model were much more accurate and efficient than the beam model.
Jaka Duje et al. [7] proposed a method to analyze tower structure by combining the stress-resultant beam model and the shell model.
P, El-Nimeiri.
ASCE et al. in: Secondary stresses on transmission tower structures [J].
Rajapakse et al. in: Joint slip in steel electric transmission towers [J].

Introduction In recent years, with the prevalent research of inorganic nano semiconductor quantum dot, it is used as the emitting layer of inorganic electroluminescence (EL) based on its unique Photoelectric characteristics.
Using Al as cathode, fixing contact barrier is to get driving voltage-current density curves shown in Fig. 2, according to the table of different thickness of device thickness shown in Table 1.
In order to compare different effects on the device current caused by metal organic interface barriers, simulation use Al and Mg:Ag alloy cathode materials in turn, while maintaining constant conditions of Fig.2.
Xue, et al.
Sun. et al.

Knudsen, Hans,et.al Modeling and transient stability of large wind farms, International Journal of Electrical Power and Energy Systems, v 25, n 2(2003), p: 123-144 [2] Li.
C.; et.al Analysis and estimation of transient stability for a grid-connected wind turbine with induction generator, Renewable Energy, v 36, n 5(2011), p: 1469-1476 [3] Gautam.
M., El-Metwally.
F,et.al, Transient stability enhancement of a wind energy distributed generation system by using fuzzy logic stabilizers, Wind Engineering, v 36, n 6(2012), p: 687-700 [7] Boroujeni, Hasan.
Mesut E,et.al, STATCOM impact study on the integration of a large wind farm into a weak loop power system, IEEE Transactions on Energy Conversion, v 23, n 1(2008) , p; 226-233 [11] Malarvizhia.

This assay was done according to Zare-Zardini et al. articles (ref).
[7] Yoon, H., et al., Biofouling occurrence process and its control in the forward osmosis.
[21] El-S'adany, A.F., et al., Fracture resistance of all ceramic crowns supported by zirconia and alumina versus titanium implant abutments.
[29] Liu, H., et al., A simple procedure to prepare spherical α-alumina powders.
[48] Soenen, S.J., et al., Investigating the toxic effects of iron oxide nanoparticles.