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In the work of Fett et al. [10], the change of Young's modulus under compressive stress loading was studied for initially unpoled and pre-poled soft PZT material using a partial unloading method.
Recently, Selten et al. [11] reported a detailed experimental study for unpoled soft PZT material.
As emphasized by Selten el al. [11], the time-dependent effect of piezoceramics has to be taken into account in investigation of the loading history dependence of the linear material parameters.
The results are in good agreement with measurements reported by Selten et al. [11] for a different soft PZT material.

A Comparative Study on the Tribological Behavior of SAE-AISI 1055 Steel and Brass (CuZn39Pb2) a Pin on Disc Type of Contact Bougoffa Mohammed Seyf Eddine1,a* Mebrouki Noura2,b 1Laboratoire de Science et Génie des Matériaux, Faculté de Génie Mécanique et Procédés U.S.T.H.B, B.P. 32 El Alia, Bab Ezzouar, Alger 16111, Algeria 2Laboratoire de Rayonnement et Plasmas et Physique des Surfaces, Faculté des Mathématiques et des Sciences de la Matière, Université Kasdi Merbah Ouargla, Ouargla 30000 (Algérie) ambougoffa@usthb.dz, bmabroukinawara@gmail.com Keywords: Friction coefficient, Wear loss, Initial surface roughness, Normal load, sliding speed.
Specimen Material Chemical composition [%wt] Hardn-ess Surface roughness Ra[μm] Disc Steel C Mn P Si S 62±0.5HRC 0.39 1.82 0.55 0.6 0.06 0.25 0.03 Brass Cu Sn Zn Ni Fe Al Pb2 63.2±0.5 HRB 0.46 2.16 Remainder 0.05 balance 0.2 0.05 0.02 1.5-2.5 Ball AISI- 52100 Steel Fe C Mn Si S P Cr 780 HV30 0.09±0.003 Remainder 1.05 0.4 0.25 0.025 0.025 1.45 At the end of the tests, the worn surfaces of the test specimens were analyzed using scanning electron microscope techniques to characterize the wear modes, resulting surface damage and wear volume.
[5] Yanliang Yi, et al, Effect of normal load on two-body abrasive wear of an Fe-B-Cr-C based alloy with minor Cu and Ni additions, wear.
Elhadi a, et al, Study of Surface Wear and Damage Induced by Dry Sliding of Tempered AISI 4140 Steel against Hardened AISI 1055 Steel, tribology in industry, Vol. 38, No. 4 (2016) 475-485
[22] Sheng-cheng ZHANG, Qing-lin PAN1,2, Jie YAN1, Xing HUANG1, Effects of sliding velocity and normal load on tribological behavior of aged Al−Sn−Cu alloy, Trans.

In addition, Qin et al. [7] synthesized and assessed two kinetic hydrate inhibitors, which were obtained by introducing a t-butyl group and both t-butyl and phenyl groups into PVP molecules.
A series of polymers of 2-vinyl-4,4-dimethylazlactone (VDMA) of varying molecular weights modified with small organic amines have been synthesized by Ree et al. [19], and their kinetic inhibition performance has been investigated in high pressure steel rocking cells.
Six novel polymers and co-polymers containing various organic moieties and pendent groups were synthesized and evaluated by Lou et al. [20], and the experimental results showed that the new KHIs are as effective as two commercially available hydrate inhibitors, Luvicap EG and Gaffix VC-713, in preventing the formation of THF hydrate.
Al-Adel, J.A.G.
El-Ghafari, and P.

For ergonomic quality, it was associated with the methodology of the author Martins [10], called OIKOS (from the Greek “cocoon” in analogy to comfort), supported by the studies of Avila et al [12], Jordan [13], and Nicolini [14] that assesses the ergonomics and usability of clothing products.
[5] Suriadi, [et al.] -: Development of a new risk assessment scale for predicting pressure ulcers in an intensive care unit.
[12] Ávila, R. et al.: ergonomía para el diseño.
Kottner et al., “Prevention and treatment of pressure ulcers/injuries: The protocol for the second update of the international Clinical Practice Guideline 2019,” J.

As reported by Ahmad et al. [10], in CO2/N2 separation process, the increase in the membrane thickness has decreased the permeability with no significant effect on the separation performance.
The production process is according to Sulaiman et al. [14] Both types of solution were coated as a thin layer on the polysulfone membrane by using a glass rod.
Besides that, Zulfikar et al. [15] stated that as the silica content increased, the Tg increased further, indicating that the polymer chains were becoming more rigid with the introduction of inorganic silica.
El-Rassy, Mercury removal from aqueous solutions using silica, polyacrylamide and hybrid silica-polyacrylamide aerogels, Chem.
[10] A.L.

Al Fuhaid and A.
Khan et al., Flexural Performance of Composite RC Beams Having an ECC Layer at the Tension Face, Period.
El-Gamal, A.
Al-Nuaimi, A.
Al-Saidy, Efficiency of Near Surface Mounted Technique using Fiber Reinforced Polymers for the Flexural Strengthening of RC Beams, Constr.

Al [27] 0.3 Weingarten et al. [28] 0.3 Krishnan et al. [29] 0.39 Thijs et al. [30] 0.39 Tang et al. [31] Steel 0.3 Rai et al. [32] 0.3 Kruth et al. [33] 0.33 Khairallah et al. [34] 0.4 King et al. [27] Ti6Al4V 0.36 Verhaeghe et al [25] 0.44 Aboulkhair et al. [29] 0.64 King et.
Similar dependence was obtained by Liverani et al. [38, 39].
The similar relationship was obtained by Attar et al. [41].
Galy, E.L.
Olakanmi, Selective laser sintering/melting (SLS/SLM) of pure Al, Al-Mg, and Al-Si powders: effect of processing conditions and powder properties, J.

For AMMC structures, a variety of aluminium alloys, such as AA 6061 [3], AA 2124 [4], AA 7039 [5], AA 7075 [6], Al A359 [7], Al A356 [8,] AA6351 [9], and AA2124 [10], are employed as base materials.
The base materials utilized in this study were AA6061 Al alloy.
Lee, Effects of strain rate on. compressive properties in bimodal 7075 Al-SiC. p. composite, Met.
Kashyap, On the hot working characteristics of 2124 Al–SiCp metal matrix composites, Adv.
Zayed, N.S.M El-Tayeb, M.M.Z.

Soudee et al[4].
In China, Jiang et al [5] discussed the affecting factors of MPC’s properties based on rhe setting time, strength, interfacial bond properties with old concrete and hydration kinetics theory.
The durability and the properties of MPC based-materials as repair material were studied systematically by Yang [6,7] and Wang et al [8,9], meanwhile, they also studid the factors influencing on setting time and the mechanical property of MPC, and the experiments in real-world documents are very promising.
By using KH2PO4 in stead of NH4H2PO4 mixing fly ash to manufacture new-type MPC were tested by Ding and Li et al [10,11], the results indicated that it can be improved the later performance of MPC which mixed mineral admixtures.
,Sharp,J.H., El-Jazairi,B.

Bandaranayake et al. and V.
Sivasubramanian et al. reported that the phase transition and change in size of the CdS nanoparticles occurs at annealing temperature between 300 and 400 °C [11, 12].
The absorption peaks due to defect levels were reported in the case of nanostructured CdS thin films and ZnS nanoparticles by Nair et al. and Chen et al. respectively [19, 20].
Banerjee, et al., Effect of the size-induced structural transformation on the band gap in CdS nanoparticles, Journal of Physics: Cond.
El-Shall, Room-temperature synthesis and characterization of nanocrystalline CdS, ZnS, and CdxZn1−xS, Chem.