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The damper is designed to have an initial yielding at about 1 mm deformation with an initial stiffness of 75 kN/mm in the elastic range, estimated using the theory of curve beams from mechanics of materials by Boresi et al [7].
The 1940 El Centro earthquake is considered as the input disturbance with its intensity scaled to 223gal and 429 gal, respectively, to explore the seismic performance of the damper.
Figure 9 shows the comparison of the floor acceleration responses under El Centro earthquake of PGA=429 gal.
Table 2 Comparison of peak accelerations Table 3 Comparison of RMS accelerations Fig. 8 The model structure in position for seismic performance test Fig. 9 Comparison of floor acceleration responses under El Centro earthquake (PGA=?

Abou-El-Hosseinb,* Precision Engineering Laboratory, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa as210026162@live.nmmu.ac.za, bkhaled.abou-el-hossein@nmmu.ac.za Keywords: Contact lens manufacturing, polymer diamond turning, ultra-high precision manufacturing.
Brinksmeier et al. [6] in their research presented a process chain for contact lens manufacturing.
Mechanical and thermal properties of RSA aluminium compared to other optical mould materials [9] Optical mould materials RSA-905 Copper alloy Steel + NiP NiP plating AA-7075 Principal elements Density (g/cm3) Al, Ni, Fe, Cu 2,95 Cu, Ni, Si, Cr 8,72 Cr Mo Steel 7,8 Cu, Mg, Zn 2,85 Mechanical prop.
Abou-El-Hossein, O.

Azaric aAbderrahmane Belarbi, LASP, Department of Mechanical USTO MB, BP 1505 El Mnaouar Oran, Algeria.
E-mail: belarbi_abd@yahoo.fr aBensmaine Mansouri, LASP, Department of Mechanical Engineering, USTO MB, BP 1505 El Mnaouar Oran, Algeria.
E-mail: smail_mansouri @yahoo.fr aGhalem Mehdi, LASP, Department of Mechanical Engineering, USTO MB, BP 1505 El Mnaouar Oran, Algeria.
Works in this direction located these concentrations in the implant neck region (Natali and Pavan, 2002; Natali and Pavan, 2003; Djebbar et al., 2010) causing painful conditions in the jaw bone (Hoshaw et al., 1994; Jung et al., 1996; Heckmann et al., 2001).
To overcome these disadvantages, some researchers have proposed models with accessories such the intra mobile element (Babbush et al., 1987), the elastic collar around the neck of the implant (Abu-Hammad et al., 2000), or even an artificial ligament, Choi (2000) while other approaches have attempted to geometric modifications to optimize implant design according to their biomechanical performance (Papavasiliou et al., 1996; Geramy et al., 2004; Bozkaya et al., 2004; Lídia et al., 2004; Yokoyama et al., 2005).

Kim et al. [1] investigated the influences of ECAE process on microstructure and shear strength of commercially pure aluminum (1050 Al alloy).
Dadbakhshi [3] investigated the effect of pre and post different heat treatment on strengthen a commercial 6082 Al alloy processed by ECAE.
Material, Specimens and Testing Device Commercially Al-6063 alloy was employed in this work.
The chemical composition of AL-6063 is provided in Table 1.The extrusion is conducted on a 60 ton Avery universal testing machine.
El-Danaf: Mater.

El-Sebaii, M.R.I.
El-Sebaii, S.
Al-Nimr and Ameer Mohammed Abbas Al-Dafaie, Using nanofluids in enhancing the performance of a novel two-layer solar pond, Energy. 68 (2014) 318–326
El-Sebaii, S.
Al-Tahaineh, Performance of a portable mini solar-pond, Applied Energy. 66 (2000) 299-310

Earthquake recordings from Dar-El-Beida of the 2003 Boumerdes earthquake were used as a seismic load.
Castaldo et al. [10] proposed a model based on the seismic reliability of buildings equipped with the friction pendulum system, the isolated structure at the base defined by a two-degree-of-freedom (2DOF) equivalent model.
Tajammolian et al. [14] investigated the seismic vulnerability of isolated buildings with triple concave friction pendulum (TCFP) devices by considering structural and isolator eccentricities.
The recordings of the Boumerdes earthquake of 2003 at the Dar-El-Beida station were used as a seismic load.
Fig. 4 The Dar-El-Beida recording of the 2003 Boumerdes earthquake 2.3 Design and Characteristics of the isolation System.

Efficiency of Agricultural Wastes for the Removal of Gasoline from Water Kudaibergenov Kenes1,a, Tulepov Marat1, Ongarbayev Yerdos1,b, Mansurov Zulkhair2 1al-Farabi Kazakh National University, 71 al-Farabi av., 050039, Almaty, Republic of Kazakhstan. 2Institute of Combustion Problems, 172 Bogenbai Batyr St., 050012, Almaty, Republic of Kazakhstan.
El-Maghraby and N.A.
Abo-El-Eneina, M.A.
Likon, et al.

Thickness Effect on the Formability of AZ31 Magnesium Alloy Sheets Archimede Forcellese1, a, Filippo Gabrielli1, b, Michela Simoncini2, c and Mohamad El Mehtedi1, d 1Università Politecnica delle Marche, Department of Mechanics, Ancona, Italy 2 Università degli Studi e-Campus, Novedrate (CO), Italy aa.forcellese@univpm.it, bf.gabrielli@univpm.it, cmichela.simoncini@uniecampus.it, delmehtedi@univpm.it Keywords: Magnesium alloy; Thickness effect; Formability.
It can be easily observed in Fig. 6b that all the experimental data, including also the data obtained by Spigarelli et al. [9], collapse almost on the same band; it can be thus reasonably concluded that the initial microstructure only marginally influences the magnitude of the peak flow stress and that similar mechanisms are operative in the investigated alloys.
In the low-Z zone in Fig. 6b (Z<10+9 s-1), the data can be successfully described by the conventional simplified power law (Eq. 1) proposed by Mohamed and Langdon [10] with n = 3 exponent (since n=3.3), thus suggesting that in this regime, in perfect analogy with Al–Mg alloys, viscous-glide of dislocations in atmosphere of solute atoms is the rate controlling mechanism.
a) b) Fig. 6. a) Equivalent strain rate vs. peak stress and b) Zener–Hollomon parameter, with Q= 135 kJ/mol, for all the data summarised in the present study, compared to data E1 obtained by Spigarelli et al. [9].
El Mehtedi: Materials Science and Engineering A Vol. 527 (2010), p. 5708 [10] F.A.

Thermo-Kinetic Study of Adsorption of Methylene Blue in Aqueous Solutions Using Algerian Illite Natural and Activated Mineral Clay LARBI Haddad1,a*, ABDELKADER Hima2,b, BELKHIR Dadamoussa3,c and ASMA Messai Aoun4,d 1Department of Chemistry, Faculty of Exact Sciences, University of El Oued, Algeria 2Department of Electrical Engineering, Faculty of Technology, University of El Oued, Algeria 3University of Ghardaia, Faculty of Sciences & Technology, Algeria 4Department of Biology, Faculty of Natural and Life Sciences, University of El Oued, Algeria haddadlarbi82@outlook.fr Keywords: illite; mineral clay; adsorption; methylene blue; water treatment; environment.
The intensity of the bands observed at 3620.8cm-1 (Al-OH-Al with Al-Mg-OH stretching vibrations) decreases after activation of acid.
The peak of the Si-O-Si band at 988.1cm-1 has remained unchanged with treatment intensity; similar results have been reported by Christidis et al. (1997).
El Bachiri, A.
El Harfi, Heliyon, Textile finishing dyes and their impact on aquatic environs, 5 (2019) e02711

The trachea and both lungs was connected to the circuit, modified from El-Gamel et al [8].
Spaggiari, J.F. et al: Immediate and long-term results after surgical treatment of primary spontaneous pneumothorax by VATS.
Dahan, et al: Prevention of air leaks after pulmonary wedge resection.
Naunheim KS, et al: Effect of bovine pericardium strips on air leak after stapled pulmonary resection.
El-Gamel, G.M.