Search results

The idea of the characteristics of heat transfer and liquid flow in various devices of tube bundles: round, ellipsoidal and pterygoid, for heat exchangers by constructing a two-dimensional numerical model was given by the Franco-Belgian team (Nagla El-Garbi, etc.) [2], and also in C Jayewel, Shaligram Tiwari [3], Sh.
Aiba et al. [4].
Numerical study of heat and flow characteristics in a single-phase heat exchanger with a parallel flow to obtain optimal shapes was conducted by South Korean researchers (Seok-Jin O et al.) [5].
[2] Najla El Gharbi, Abdelhamid Kheiri, Momammed El Ganaoui, Ryan Blanchard, Numerical optimization of heat exchangers with circular and non-circular shapes, In Case Studies in Thermal Engineering, 6 (2015) 194-203
Case, A.L.

Shen et al. [6] demonstrated that ASTM E1290-02 gave CTOD values about 30 % smaller than those calculated in BS7448 for the girth welds of API 5L Grade X80.
Donato et al. [7] also showed that CTOD converted from plastic work and its dimensionless J calibration factor was 20 to 30 % lower than the corresponding BS7448-CTOD in JIS SM400C steel.
In the working group, Tagawa et al. [8] indicated that ASTM E1290-08 gave a smaller value of the critical CTOD for cleavage cracking than that evaluated by BS7448 for low yield-to-tensile ratio steels, and we [9] developed an equation that transforms BS7448-CTOD into ASTM E1290-CTOD with reasonable accuracy.
CTOD in BS7448-1:1991 and ASTM E1290-08 BS7448-CTOD, δBS, is obtained by the following equation [2], where δBS,el is the elastic part of δBS, δBS,pl is the plastic part of δBS, K is the stress intensity factor, ν is Poisson's ratio, E is Young's modulus, σYS is the 0.2% offset yield strength, rpl is the plastic rotational factor, Vpl is the plastic part of clip gauge opening displacement, a is the crack length, b is the uncracked ligament width and z is the distance of the knife edge measurement point from the front face on Single Edge-notch Bend (SEB) specimens or from the load line in Compact Type (CT) specimens
( ) ( )                     + + + + − = + = += W2.0a8.0 z 1bB A E 1K m1 JJ m1 plpl 2 2 Y plel Y pl,ASTM el,ASTM ASTM α η ν σ σ δδδ (2) m and ηpl are the constraint factor and the plastic J calibration factor, respectively, and are given by the following equations

The p+-layer were formed by implantation of Al and thermal annealing; a p+n junction was formed at a depth of 0.6 µm [3].
Similar effects observed earlier for proton irradiated 6H-SiC pn structures with NdNa=4x1016 cm-3 [4] (the irradiation was carried out with 8 MeV protons with doses 1014-1016 cm-2). 1.6 2 2.4 2.8 3.2 Photon energy, eV 0 0.2 0.4 0.6 0.8 1 EL intensity, arb.un. 1 2 3 a 1.6 2 2.4 2.8 3.2 Photon energy, eV 1x10-3 1x10-2 1x10-1 1x100 EL intensity, arb.un. 1 2 3 b Fig.3.
Injection electroluminescence spectra of the pn structure at forward current 100mA before irradiation (curves 1), after gamma-ray irradiation (curves 2) and after first neutron irradiation dose (curves 3); room temperature; the scale for EL intensity is linear (a) or logarithmic (b).
[3] E.V.Kalinina et al: Semiconductors Vol. 37 (2003), p. 1229
[4] A.M.Strel'chuk et al: Mat.

References [1] Badaoui M El, Cahouet V, Guillet F, et al.
[2] Badaoui M El, Antoni J, Guillet F, et al.
[3] Parey A, Badaoui M El, Guillet F, et al.

Prediction of dissipative properties of flax fibers reinforced laminates by vibration analysis Marouane BELAÏD 1, a *, Stéphane FONTAINE 1,b, Ali EL HAFIDI 1,c , Papa- Benoît PIEZEL 1,c, Papa-Birame GNING 1,c, 1DRIVE EA1859, Univ.
a*marouane.belaid@u-bourgogne.fr, bstephane.fontaine@u-bourgogne.fr, cali.el_hafidi@u-bourgogne.fr Keywords: Laminates, damping, viscoelasticity, frequency, vibration.
Initially introduced by Wojtowicki et al. [7], this device allows high-length beams characterization on a large frequency bandwidth.
Table 1: Identified parameters of fractional derivative Zener model Paramètres EL ET E45 E1 (GPa) 22,0 4,9 7,0 E2 (GPa) 2,1 2,3 2,0 μ (Pa.s) 46 643 13 606 α 0,238 0,160 0,159 Fig. 3: Experimental and analytic frequency dependence on [0°]8 storage modulus and loss factor Fig. 4: Experimental and analytic frequency dependence on [90°]8 storage modulus and loss factor Fig. 5: Experimental and analytic frequency dependence on [±45]2s storage modulus and loss factor In a second step, moduli and loss factors have been experimentally measured on a quasi-isotropic laminate [45/-45/90/0]s.

El Espacio Europeo de Educación Superior y su impacto en la docencia (Edited by Aljibe, Málaga 2005). 3.
Cosano: La plataforma de aprendizaje moodle como instrumento para el trabajo social en el contexto del espacio europeo de la educación superior.
http://www.cibersociedad.net/congres2009/es/coms/moodle-como-plataforma-blended-learning-y-su-funcionalidad-en-la-convergencia-al-espacio-europeo-de-educacion-superior/1086/. 8.
Barro: Las TIC en el sistema universitario español, Conference of Rectors of the Spanish Univerties (CRUE) (2009).
Moreno: Experiencia B-Learning: La convergencia de las TICs en el Espacio Europeo de Educación Superior, III Online Congress: Open knowledge.

Dinnebier, et al, Science 296 , 109-111 (2002) [12] E.
[15] D.W.Boukhvalov, P.F.Karimov and E.Z.Kurmaev at el, Phys.Rev.B 69, 115425-9 (2004)
Shih et al, Science 288, 494-497 (2000)
[18] J.Park. et al, Nature 417, 722-725 (2002)
Landauer et al, Phys.Rev.

Several investigators, including Duowen and Hargrove (2006), Chandra and Khaled (2005), Mauricio (1998), Rodrigues (1998), Hashem et.al (2000), Ahmed (2004), Hassona et.al (2005) and Love et.al (1987) investigated the performance of reinforced soil system using numerical analysis based on finite element analysis method.
Dept., Faculty of Engineering, El-Mina University, El-Minia, Egypt
El-Hoseiny. (2005).
Bulletin of the Faculty of Engineering, Faculty of Al-Azhar Engineering, Cairo, Egypt, 119 (1)

Elleithy et al. [4,5] established the convergence and optimal convergence conditions for the Dirichlet-Neumann interface relaxation FEM-BEM coupling method.
Al-Gahtani, M.
El-Gebeily, Iterative Coupling of BE and FE Methods in Elastostatics, Engineering Analysis with Boundary Elements, 25 (2001), pp. 685-695
El-Gebeily, W.M.
Al-Gahtani, Convergence of the Domain Decomposition Finite Element-Boundary Element Coupling Methods, Computer Methods in Applied Mechanics and Engineering, 191 (2002), pp. 4851-4867

Development of Cutting Force Model of Aluminum Nitride ceramic processed by Micro End Milling Moola Mohan Reddy1,a,Alexander Gorin1,b, and Khaled Abou-El-Hossein2,c 1.Curtin University of Technology,Sarawak campus, Malaysia 2.Nelson Mandela Metropolitan University,South Africa a mohan.m@curtin.edu.my, b Alexander.g@curtin.edu.my, c Khaled.Abou-El-Hossein@nmmu.ac.za Key words: Aluminum Nitride ceramics, Surface roughness, End milling Abstract: Advanced ceramics are difficult to do machining due to brittle nature.
Tuersley et al. [10] did literature review about the performance of various machining methods on advanced ceramics; these include grinding, ultrasonic, abrasive water jet, electrical discharge and laser techniques.
Mayer Jr et al. [12] investigated the effect of grinding parameters on surface finish of ground hot pressed silicon nitride.