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Online since: April 2024
Authors: Mohammed Benatallah, Kada Bouchouicha, Alireza Sharifi, Yasser Abdel-Hadi, Samuel C. Nwokolo, Nadhir Al-Ansari, Ilhami Colak, Laith Abualigah, El-Sayed M. El-kenawy, Nadjem Bailek
EL-Shimy, M.
EL-Shimy, H.
Al-Mostafa, M.
El-Shimy, N.
El-Shimy, and A.
Online since: June 2012
Authors: Da Feng Gao, Peng Fei Li, Lei Wang
The model displacement and acceleration time history curves were obtained by taking the two models subjected to El-Centro ground motion, Taft ground motion and Lanzhou artificial ground motion excitation.
Gao et al. [1] carried out timber frame model test under cyclic loading.
Ding et al. [12] established the finite element models of archer's tower of the Xi'an city wall Yongning gate (south gate) , and got the dynamic magnification factor of each layer.
Su et al. [6] established a one-storey Chinese timber structure of palace style, the total dynamic magnification factor was got(about 0.44).
(a)time-acceleration interval curve of model 1 (b)time-acceleration interval curve of model 2 (Taft wave 70Gal) (Taft wave 70Gal) (c)time-acceleration interval curve of model 1 (d)time-acceleration interval curve of model 2 (El-Centro wave 220Gal) (El-Centro wave 220Gal) (e)time-acceleration interval curve of model (f)time-acceleration interval curve of model 2 (Lanzhou artificial wave 400Gal) (Lanzhou artificial wave 400Gal) Fig.5 Time-acceleration interval curve Table 4 Peak acceleration and Peak displacement position Node number Displacement(cm) Acceleration(Gal) Model 1 Model 2 Model 1 Model 2 Model 1 Magnification factor Model 2 Magnification factor Taft(70Gal) Column feet 1053 1017 0.426 ─— 58.03 0.829 ─— ─— Column top 1092 1056 2.475 0.867 39.08 0.656 467.8 6.683 roof 8055 7771 2.544 0.971 34.51 0.909 529.6 1.132 El-Centro(220Gal) Column feet 1053 1017 1.381 ─— 200.6 0.912 ─— ─—
Online since: September 2011
Authors: Mohamad El Mehtedi, Tommaso Pinter
The aim of the present paper is thus to analyze and compare the experimental data obtained by the authors of this study by testing in torsion three different Al alloys (AA6005A, AA6063 and AA7020).
El Mohtadi for helping in processing data.
[5] Verlinden B., Voith K., “Constitutive Equations for Hot Deformation of Al-Mg-Si Alloys”, Risø International Symposium on Materials Science: Numerical Predictions of Deformation Processes and the Behaviour of real Materials.
[6] Donati, L., El Mehtedi, M., 2011, “Characterization of flow stress of different AA6082 alloys by means of hot torsion test”, the 14th International ESAFORM Conference on Material Forming, AIP Conf.
[7] Castellanos, J., Rieiro, I., El Mehtedi, M., Carcì, M., Ruano, O.
Online since: July 2011
Authors: Wei Xiong, Shu Sheng Gao, Bao Hua Chang
High accuracy 3d seismic can be observed using a wide azimuth according to the requirement of crack, fracture-vuggy reservoir interpretation (Wang, 2010); Well testing interpretation model for triple-medium in which fracture communicated with wellbore have been used in the fractured-vuggy reservoirs (Wang, Yao, etc, 2006; Wu, 2007); Many types of storage space and different combined types of fractured and vug results that fracture and vug is difficult to identify in fractured-vuggy reservoirs (Zhang, 2001; Zhang et al., 2004; Zhou, 2002).
The table 1 shows the flow pattern discriminant conditions of Beggs-Brill method, mainly including separated flow, transition flow, intermittent flow and dispersed flow: Table1 Flow pattern discriminant conditions Conditions Flow pattern El<0.01, NFrEl≥0.01, NFrEl≥0.01, L2< NFrEl<0.4,L3< NFr< L1 or El>0.4, L3< NFrEl<0.4, NFr≥L1 or El>0.4,NFr>L4 Dispersed flow Where: ; ; ; .
References [1] Wang Yanfeng, Wang Naijian, Gao Guocheng, et al.
S, Christine E E, Guan Qin, et al.
Online since: April 2014
Authors: Ahmed M.R. Fath El-Bab, Osamu Tabata, Koichi Nakamura, Mohammed Gamil, Ahmed Abd El-Moneim
Fath El-Bab4,5,d, Ahmed Abd El-Moneim1,e 1Materials Science and Engineering Department, Egypt-Japan University of Science and Technology, New Borg El-Arab, Alexandria 21934, Egypt 2Department of Micro Engineering, Kyoto University, Kyoto 615-8540, Japan 3Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 615-8540, Japan 4Mechatronics and Robotics Department, Egypt-Japan University of Science and Technology, New Borg El-Arab, Alexandria 21934, Egypt 5On-leave from Mechanical Engineering Department, Faculty of Engineering, Assiut Unversity, Assiut 71516, Egypt amohamed.gamil@ejust.edu.eg, btabata@me.kyoto-u.ac.jp, ckoichi@cpier.kyoto-u.ac.jp, dahmed.rashad@ejust.edu.eg, eahmed.abdelmoneim@ejust.edu.eg Keywords: Graphene; Strain gauge; Gauge factor; Piezoresistive sensors; MEMS devices.
In this regard, Lee et al. reported in their study that the gauge factor of graphene film grown on Cu substrate by chemical vapor deposition (CVD) was 6.1 at 1% strain [5], though this value is still far beyond the target for highly sensitive sensor.
Meanwhile, Chen et al. reported that the gauge factor for graphene monolayer obtained by mechanical exfoliation method was 150 [2].
This value is higher than that prepared by Lee et al. using CVD, and provides a clear indication for the importance of utilizing graphene monolayer in the fraction process of strain gauge sensor.
Online since: September 2011
Authors: Zhi Pan Gu, Xue Bin Yang, Ji Chun Yang, Shao Hua He
Previous studies by the Al-Ghouti el at[1], E.
Erdem el at[2], Khraisheh el at[3], Shawabkeha el at[4] have been explored adsorption performance and the properties of diatomite.
Al-Ghouti el at[1] have used the modified diatomite to remove reactive black and reactive golden yellow.
Al-Ghouti,,M.A.M.
Allen,et al.
Online since: April 2007
Authors: Ming Xing Ai, Li Qiang Gao, Cui Wei Li, Yang Zhou, Hong Xiang Zhai, Zhen Ying Huang, Zhi Li Zhang, Shi Bo Li
Wang et al. [7] synthesized dense polycrystalline Ti3AlC2 by reactively hot-pressing a mixture of Ti, Al, and graphite powders at 1500o C and 25 MPa for 5 min with subsequently annealing at 1200 o C.
The mole ratio of the powder mixture for the samples 1~6 was Ti: Al: C = 3: 1.1: 2, and the mole ratio for the sample 7 was Ti: Al: C: Sn = 3: 1: 2: 0.2.
El-Raghy: J.
El-Raghy: Nature, Vol.407 (2000), pp. 581
El-Raghy: J.
Online since: February 2014
Authors: M.R. Sahar, Sib Krishna Ghoshal, Nur Amanina Mat Jan, R. Ariffin, M.S. Rohani, K. Hamzah
The indirect optical band gap was found to increase from 3.04 to 3.20 eV as increasing the content of Nd2O3 which agrees with findings of El-Mallawany et. al [7].
Sharaf El-Deen, M.S.
Al Salhi and Meawad M.
El-Mallawany, M.
El-Sayed: J.
Online since: April 2010
Authors: Heikki Helava, Yuri Makarov, T.Yu. Chemekova, O.V. Avdeev, N. Mokhov, M.G. Ramm, S.S. Nagalyuk
Nikishin et al at Texas Technical University [3], with three times lower dislocation density in the structure being detected as compared to the same structure grown on sapphire substrates.
QW thickness was chosen to reach maximum EL intensity in 340-350 nm range.
Composition of these layers was high enough to obtain transparency for EL emission.
EL spectra of GaN/AlGaN MQW LED on AlN at different currents (right) EL spectra of same LED vs.
AlN substrate transparency spectrum (middle), EL spectra of GaN/AlGaN MQW LED on AlN and sapphire.
Online since: February 2012
Authors: V.S. Gayathri, D. Gnana Prakash, R. Kameshwari, R. Supraja, Ramesh Munusamy, K. Yamuna, Thiruvalan Venkatesan
Materials and methods Preparation of coupons Aluminium 1100 (Al) of composition Si + Fe = 0.95%, Cu = 0.12%, Al=99.0% are used for the entire study.
The most frequently used isotherms are Langmuir, Freundlich, Frumkin, Hill de Boer, Parsons, Temkin, Flory- Huggins, Dhar-Flory-Huggins, Bockris – Swinkels and the thermodynamic model of El-Awady et al.
The results obtained from the present study have been fitted into three isotherms viz., Temkin (Fig 2), Freudlich (Fig 3) and El–Awady et al (Fig 4).
El- Awady adsorption isotherm.
Abd-El-Rehim, A.
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