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And the CeO2 will be obtained by removing NaF through water washing and leaching the impurity elements including La, Fe, Al, Ca, etc. via hydrochloric acid (HCl).
In recently, Wu et al [3, 4] mainly studied the fluoride removal effect by adding CaO-NaCl-CaCl2 in the process of roasting; and the others achieved good results in rare earth extraction and separation [5-7].And then ceria can be prepared by these cerium compounds through precipitation [8, 9] and sol-gel method [10].
The product CeO2 is stayed in solid state, and bits of Ce, REE including La, Nd, etc. and impurity elements including Ca, Fe, Ba, Sr, Al, etc in dissolve solution.
El-Hefny, Y.
El-Nadi, I.

Also, it has been previously demonstrated by Ibrahim and El Meliegy [10].
Souza et al [11] suggested that a phase separation of liquid phase occurs.
Lee et al [12] have shown that the liquid at the grain surface has a different composition from the interior in particular for the calcia and alumina contents.
[7] E.A.El-Meliegy.
[10]D.M.Ibrahim and E.A.El-Meliegy,.Brit.Ceram.Trans.2000, 99, (4), 159-163

Three cases can be distinguished: (9) where ey=sy/E, with sy denoting the normal compressive strength, el is the normal strain limit value and h a model parameter.
When h=0, a linear elastic response is obtained for 0>e>ey and in this case el=ey; otherwise, when h = 1, a quadratic elastic response is obtained for 0>e>el with el=2ey.
The equation governing the cross-section constitutive response is obtained by integrating the masonry material constitutive law in the cross-section, A, resulting as: , (10) where k is the section stiffness matrix, expressed as: with, (11) k is the shear factor and Ae and Al are the portions of the cross-section A where 0>e>el and el>e>eu, respectively.
The inelastic stress vector Sl is defined as: , (12) where Se and Ie are the first and second order moments of the cross-section portion Ae, while Sl and Il are the same quantities for the cross-section inelastic portion Al, and Je is the third order moment of Ae.

In case the El was 0.51 J/mm 2, the resin material spattered seriously together with an audible slipstream.
In case the El was 0.42 J/mm 2, there existed a slight spatter and a slight audible slipstream.
If El decreased to 0.36 J/mm 2, no spatter was found but a little smog in the field of laser facula, which meant the lack of the material removal.
For resin bonded CBN wheel with grit number 40/45, the synthesized parameter El should kept at 0.42 J/mm 2.
Sun, et al.: Journal of Materials Processing Technology.

Grain Shape Effect and the Viscoplastic Parameter on the Evolution of Isotropic and Kinematic Hardening of Metallic Materials under Cyclic Loading Abdelhamid Kerkour-El Miad1*, Aissa Kerkour-El Miad2, R.
Summarized in (Table 1), these model constants are chosen as in Dingli et al. (2000) [7].
Indeed, for the sake of simplicity and based on some obtained results (e.g., Abdul-Latif et al., 2008) [9], it is considered that the values of h1= h2= h3= h4= h5=1.
[6] Kerkour-El Miad A.,’’ Modélisation micromécanique du comportement cyclique des polycristaux sous chargement multiaxiaux à déformation et à contrainte imposées avec l’effet de la forme du grain’’ Thèse de doctorat, Université Pierre et Marie Curie(2011) [7] Dingli, J.

El-Badawy2,b 11Dept. of Engineering Mechanics, German University in Cairo, Cairo, Egypt 2 Dept. of Mechanical Engineering, Al-Azhar University, Cairo, Egypt and Dept. of Mechatronics Engineering, German University in Cairo, Cairo, Egypt amary.abdel-maseeh@guc.edu.eg, bayman.elbadawy@guc.edu.eg Keywords: Coupled bending-torsional vibrations, assumed modes and rotating blades.
Subrahmanyam et el. solved for coupled vibration frequencies and mode shapes for rotating uniform blades [2].
That was later confirmed by Kaya et al. in [6].
Patil et el. in [7] mentioned that wing stability against flutter is very sensitive to the ratio of bending and torsional stiffnesses.

Mansour, K.El-Egili and G.
El-Damrawi: Physica B.
El-Damrawi and K.
El-Egili: Physica B.
Ravikumar et al.: Physica B.

Marzuki et al., Compositional dependence of density and refractive index in Borotellurite Glass, J.
El-Diasty, One-photon band gap engineering of borate glass doped with zno for photonics applications, J.
El-Mallawany, A.
El-Hawary, and N.
El-Khoshkhany, Volume and thermal studies for Tellurite Glasses, J.

El-Raghy, J.
Huang. et al.
El-Raghy, M.W.
El-Raghy, M.W.
Gong, et al.

El-Sabbah5,e, I.A.
[2] M.S Al-Qubaisi, A Rasedee, M.H Flaifel, Cytotoxicity of nickel zinc ferrite nanoparticles on cancer cells of epithelial origin. 
Rashad, Preparation of ZnO nanoparticles using electrodeposition and co-precipitation techniques for dye-sensitized solar cell applications, J MATER SCI-MATER EL, 25 (2014) 3412
El-Sabbah and I.
El-Sabbah, I.