Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: September 2014
Authors: Robert Jankowski, Ayman Seleemah, Saher El-Khoriby, Hytham Elwardany
Chau et al. [10] carried out a shaking table experiment to investigate the pounding phenomena between two steel towers with different natural frequencies and damping ratios, subjected to different combinations of stand-off distance and seismic excitations.
Earthquake excitations used in the experiments Excitation Amplification,% PGA [m/sec2] 1940 El Centro, NS 100% 3.070 1995 Kobe, NS (JMA station) 25 % 8.057 1989 Loma Prieta, NS (Corralitos station) 50% 6.315 1994 Northridge, EW (Santa Monica station) 75% 8.660 1971 San Fernando, N74°E (Pacoima Dam station) 25% 11.375 2002 Polkowice mining tremor 100% 1.634 Table 2.
Acceleration time histories of different towers with zero gap distance when subjected to the El Centro earthquake: (a) configuration (1); and (b) configuration (2). .
Table 3 summarizes the maximum and minimum accelerations of independent vibrations (without pounding) of the three towers under the El Centro earthquake.
Independent maximum and minimum accelerations when subjected to the El Centro earthquake Accelerometer Configuration (1) Configuration (2) Max., m/s2 Min., m/s2 Max., m/s2 Min., m/s2 A1 7.78 -7.39 10.25 -10.37 A2 8.94 -8.86 6.97 -6.92 A3 8.46 -7.89 8.60 -9.67 Final conclusions The results of the study show that pounding observed during damaging earthquakes might significantly affect the behaviour of structures in series.
Earthquake excitations used in the experiments Excitation Amplification,% PGA [m/sec2] 1940 El Centro, NS 100% 3.070 1995 Kobe, NS (JMA station) 25 % 8.057 1989 Loma Prieta, NS (Corralitos station) 50% 6.315 1994 Northridge, EW (Santa Monica station) 75% 8.660 1971 San Fernando, N74°E (Pacoima Dam station) 25% 11.375 2002 Polkowice mining tremor 100% 1.634 Table 2.
Acceleration time histories of different towers with zero gap distance when subjected to the El Centro earthquake: (a) configuration (1); and (b) configuration (2). .
Table 3 summarizes the maximum and minimum accelerations of independent vibrations (without pounding) of the three towers under the El Centro earthquake.
Independent maximum and minimum accelerations when subjected to the El Centro earthquake Accelerometer Configuration (1) Configuration (2) Max., m/s2 Min., m/s2 Max., m/s2 Min., m/s2 A1 7.78 -7.39 10.25 -10.37 A2 8.94 -8.86 6.97 -6.92 A3 8.46 -7.89 8.60 -9.67 Final conclusions The results of the study show that pounding observed during damaging earthquakes might significantly affect the behaviour of structures in series.
Online since: November 2022
Authors: Asmaa Ashraf Hanafi, Marwa El-Kady, Mohamad Ayad
Hanafi1,a, Marwa El-Kady2,3,b, Mohamad M.
Wang et al., “A robust zirconium amino acid metal-organic framework for proton conduction,” Nature Communications, vol. 9, no. 1, 2018, doi: 10.1038/s41467-018- 07414-4
Sandhu et al., “Green MIP-202(Zr) Catalyst: Degradation and Thermally Robust Biomimetic Sensing of Nerve Agents,” J Am Chem Soc, vol. 143, no. 43, pp. 18261–18271, Nov. 2021, doi: 10.1021/jacs.1c08356
Abd El-moneim, and M.
Ibrahim et al., “Tuning the Chemical Environment within the UiO-66-NH2 Nanocages for Charge-Dependent Contaminant Uptake and Selectivity,” Inorganic Chemistry, 2019, doi: 10.1021/acs.inorgchem.9b01611.
Wang et al., “A robust zirconium amino acid metal-organic framework for proton conduction,” Nature Communications, vol. 9, no. 1, 2018, doi: 10.1038/s41467-018- 07414-4
Sandhu et al., “Green MIP-202(Zr) Catalyst: Degradation and Thermally Robust Biomimetic Sensing of Nerve Agents,” J Am Chem Soc, vol. 143, no. 43, pp. 18261–18271, Nov. 2021, doi: 10.1021/jacs.1c08356
Abd El-moneim, and M.
Ibrahim et al., “Tuning the Chemical Environment within the UiO-66-NH2 Nanocages for Charge-Dependent Contaminant Uptake and Selectivity,” Inorganic Chemistry, 2019, doi: 10.1021/acs.inorgchem.9b01611.
Online since: July 2017
Authors: Mebrouk Bellaoui, Abdelatif Hassini, Kada Bouchouicha
Tronin et al.
The RST approach proposed by Tramutoli et al. (1998) is described to identify space-time signal.
Corrado et al.
The measurements values in TIZI OUZOU and Dar EL-beida station represented with red and blue curve respectively.
Di Bello et al., “Robust satellite techniques for volcanicand seismic hazards monitoring,” Ann.
The RST approach proposed by Tramutoli et al. (1998) is described to identify space-time signal.
Corrado et al.
The measurements values in TIZI OUZOU and Dar EL-beida station represented with red and blue curve respectively.
Di Bello et al., “Robust satellite techniques for volcanicand seismic hazards monitoring,” Ann.
Online since: November 2016
Authors: Jian Zhong Cui, Guang Ming Xu, Qing Feng Zhu, Yu Bo Zuo, Lei Li
However the macrosegregation has been a key problem for DC casting of 2524 alloy due to the high segregation tendency of copper in Al-Cu alloys.
Experimental procedure The commercial aluminium alloy 2524, Al-4.3Cu-1.45Mg-0.65Mn-0.02Ti (all in wt%), was used in the present work.
[3] M O El-Bealy, Modeling of Heat Transfer and Interdendritic Strain for Exuded Surface Segregation Layer in the Direct Chill Casting of Aluminum Alloys.
[6] M O El-Bealy, On the formation of extruded surface segregation layer in aluminum direct chill casting process.
[17] C J Vreeman, F P Incropera, The effect of free-floating dendrites and convection on macrosegregation in direct chill cast aluminum alloys: Part II: predictions for Al-Cu and Al-Mg alloys.
Experimental procedure The commercial aluminium alloy 2524, Al-4.3Cu-1.45Mg-0.65Mn-0.02Ti (all in wt%), was used in the present work.
[3] M O El-Bealy, Modeling of Heat Transfer and Interdendritic Strain for Exuded Surface Segregation Layer in the Direct Chill Casting of Aluminum Alloys.
[6] M O El-Bealy, On the formation of extruded surface segregation layer in aluminum direct chill casting process.
[17] C J Vreeman, F P Incropera, The effect of free-floating dendrites and convection on macrosegregation in direct chill cast aluminum alloys: Part II: predictions for Al-Cu and Al-Mg alloys.
Online since: May 2015
Authors: Lin Geng, Gui Song Wang, El Oualid Mokhnache
Dry sliding wear resistance of the in situ Al2O3/Al-Si composites fabricated in Al-SiO2 by reaction hot pressing.
El Oualid.
But, Anand et al [7] also found that the incorporation of more than 30 wt.% of Al2O3 in Al-10wt.% Zn further deteriorated the wear resistance.
Tech. 57(1997)415–435 [9] El Oualid.
Zoheir, Effect of porosity on dry sliding wear of Al–Si alloys, Tribol.
El Oualid.
But, Anand et al [7] also found that the incorporation of more than 30 wt.% of Al2O3 in Al-10wt.% Zn further deteriorated the wear resistance.
Tech. 57(1997)415–435 [9] El Oualid.
Zoheir, Effect of porosity on dry sliding wear of Al–Si alloys, Tribol.
Online since: March 2024
Authors: Andreas Nocke, Mareen N. Warncke, Chokri Cherif, Johannes Mersch, Philippa Ruth Christine Böhnke, Carola H. Böhmer, Ann-Malin Schmidt
In another study, Hofmann et al. used textile components in composite components to monitor bending.
Lee et al. demonstrated using TDR to measure stretchable conductor strain [23].
Light microscope pictures of the sensor’s cross section, from left to right: LK-EL-F9, SK-EL-F9/8, SK-PA-F8 Table 1.
Gauge factor, linearity, and drift of base capacitance Variant SK-EL-F9 SK-EL-F8 SK-PA-F8 LK-EL-F9 Gauge factor 0.25 0.3 0.17 0.29 Linearity 0.016 0.02 0.008 0.019 Base capacitance drift from C0 [%] 5.6 5.4 3.5 1 Fig. 6.
Gauge factors and corresponding linearity through compression Gauge factor Linearity SK-EL-F9 0.007 0.0015 SK-EL-F8 0.01 0.0047 SK-PA-F8 0.005 0.0024 LK-EL-F9 0.0027 0.0091 Strain Localization Through TDR.
Lee et al. demonstrated using TDR to measure stretchable conductor strain [23].
Light microscope pictures of the sensor’s cross section, from left to right: LK-EL-F9, SK-EL-F9/8, SK-PA-F8 Table 1.
Gauge factor, linearity, and drift of base capacitance Variant SK-EL-F9 SK-EL-F8 SK-PA-F8 LK-EL-F9 Gauge factor 0.25 0.3 0.17 0.29 Linearity 0.016 0.02 0.008 0.019 Base capacitance drift from C0 [%] 5.6 5.4 3.5 1 Fig. 6.
Gauge factors and corresponding linearity through compression Gauge factor Linearity SK-EL-F9 0.007 0.0015 SK-EL-F8 0.01 0.0047 SK-PA-F8 0.005 0.0024 LK-EL-F9 0.0027 0.0091 Strain Localization Through TDR.
Online since: April 2014
Authors: Shao Wei Duan, Xian Tan, Wei Huang
Select EL-Centro wave,Tangshan wave,artificial wave for time history analysis on 8 degrees frequent earthquake, Enter the peak acceleration is 70cm/s2.
In frequent earthquake,EL-Centro wave and Tangshan wave is inputed respectively, structure with and without Lead Rubber Bearings were analyzed, the top acceleration time history curve as shown in figure 4 and figure 5, the top of the maximum acceleration shown in Table 2.
Figure.4 Acceleration time-history at top floor of structure with and without Lead Rubber Bearings under EL-Centro wave frequent earthquake Figure.5 Acceleration time-history at top floor of structure with and without Lead Rubber Bearings under Tangshan wave frequent earthquake Table.2 Maximum acceleration, contrast under EL-Centro wave and Tangshan wave (m/s2) Seismic Condition EL-Centro wave Tangshan wave X Direction Y Direction X Direction Y Direction General Structure 2.29 1.95 2.20 2.34 Isolated Structure 0.51 0.42 0.54 0.66 Reduction rate 77.7% 78.4% 75.4% 71.8% As the top acceleration response in Figure 4 and figure 5 can be seen, in frequent earthquake structure with Lead Rubber Bearings has larger effect on attenuation peak position acceleration.
The isolated structure maximum storey drift respectively is 3.36mm, 4.24mm and 3.68mm under the action of EL-Centro wave, Tangshan wave and artificial wave.
[5] Kim Y J,Kim M H,Jung I Y,et al.Experimental investigation of the cyclic behavior of nodes in diagrid structures[J].Engineering Structures,2011,33 (7):2134-2144
In frequent earthquake,EL-Centro wave and Tangshan wave is inputed respectively, structure with and without Lead Rubber Bearings were analyzed, the top acceleration time history curve as shown in figure 4 and figure 5, the top of the maximum acceleration shown in Table 2.
Figure.4 Acceleration time-history at top floor of structure with and without Lead Rubber Bearings under EL-Centro wave frequent earthquake Figure.5 Acceleration time-history at top floor of structure with and without Lead Rubber Bearings under Tangshan wave frequent earthquake Table.2 Maximum acceleration, contrast under EL-Centro wave and Tangshan wave (m/s2) Seismic Condition EL-Centro wave Tangshan wave X Direction Y Direction X Direction Y Direction General Structure 2.29 1.95 2.20 2.34 Isolated Structure 0.51 0.42 0.54 0.66 Reduction rate 77.7% 78.4% 75.4% 71.8% As the top acceleration response in Figure 4 and figure 5 can be seen, in frequent earthquake structure with Lead Rubber Bearings has larger effect on attenuation peak position acceleration.
The isolated structure maximum storey drift respectively is 3.36mm, 4.24mm and 3.68mm under the action of EL-Centro wave, Tangshan wave and artificial wave.
[5] Kim Y J,Kim M H,Jung I Y,et al.Experimental investigation of the cyclic behavior of nodes in diagrid structures[J].Engineering Structures,2011,33 (7):2134-2144
Online since: September 2003
Authors: Peder Bergman, Fanny Dahlquist, H. Lendenmann, Christer Hallin
of these EL signatures was done by comparison to
KOH etched features.
The image further shows that screw dislocations (white dots in Fig. 5b) have here no corresponding EL signature, that edge dislocations can be mapped in EL, and that line shaped EL features correspond to partial dislocation loops propagating in the basal plane and bounding small SF.
Sugawara et. al. 12-19kV 4H-SiC pin Diodes with Low Power Loss, ISPSD, (2001) [3] H.
Lendenmann, et. al.
Bergman, et.al.
The image further shows that screw dislocations (white dots in Fig. 5b) have here no corresponding EL signature, that edge dislocations can be mapped in EL, and that line shaped EL features correspond to partial dislocation loops propagating in the basal plane and bounding small SF.
Sugawara et. al. 12-19kV 4H-SiC pin Diodes with Low Power Loss, ISPSD, (2001) [3] H.
Lendenmann, et. al.
Bergman, et.al.
Online since: August 2023
Authors: Maryam Elhajam, Noureddine Idrissi Kandri, Abdelaziz Zerouale, Meryem Hajji Nabih, Hamza Boulika
El Hajam1,2,c, N.
Nabih, M. el Hajam, H.
[23] M. el Hajam, N.
El-Shazly, H.S.
[43] M. el Hajam, N.
Nabih, M. el Hajam, H.
[23] M. el Hajam, N.
El-Shazly, H.S.
[43] M. el Hajam, N.
Online since: September 2013
Authors: Omnia A.A. El-Shamy, Abdullah S. Al-Ayed
El-Shamy1a and Abdullah S.
Al-Ayed2b 1 Analysis and Evaluation Department, Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727 Cairo , Egypt. 2 College of Science and Arts at Ar-Rass, Qassim University, P.O.
[19] Hafiz, A.A.; El-Din, H.M.; Badawi, A.M., Colloid and Interface Science 284 (2005) 167
EL-Tabei, Corrosion Science 53 (2001) 671
Al-Ayed2b 1 Analysis and Evaluation Department, Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727 Cairo , Egypt. 2 College of Science and Arts at Ar-Rass, Qassim University, P.O.
[19] Hafiz, A.A.; El-Din, H.M.; Badawi, A.M., Colloid and Interface Science 284 (2005) 167
EL-Tabei, Corrosion Science 53 (2001) 671