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Online since: May 2012
Authors: Qing Xu Yao, Ming Chun Jia, Jin Feng Men
[2] Zeid Abdullah Al-othaman, Synthesis, modification and application of mesoporous materials based on MCM-41, In: Ph D.
[5] El-Nahhal, Y.Z., Safi, J.M., Adsorption of phenanthrene on organoclays from distilled and saline water.
El-Ashgar, I.M.
El-Ashgar, I.M.
Warner, Thanapon Sangvanich, et. al., Removal of heavy metals from aqueous systems with thiol functionalized superparamagnetic nanoparticles, Environ.
[5] El-Nahhal, Y.Z., Safi, J.M., Adsorption of phenanthrene on organoclays from distilled and saline water.
El-Ashgar, I.M.
El-Ashgar, I.M.
Warner, Thanapon Sangvanich, et. al., Removal of heavy metals from aqueous systems with thiol functionalized superparamagnetic nanoparticles, Environ.
Online since: May 2019
Authors: K. Udaya Bhat, G.K. Manjunath, G.V. Preetham Kumar
Severe Plastic Deformation of Al-15Zn-2Mg Alloy: Effect on Wear Properties
G.
Also, Adding magnesium to Al-Zn alloys increases the age hardening characteristics of the alloy.
Summary In the present work, Al-15Zn-2Mg alloy was tried to ECAP at lowest possible temperature.
El Aal, N.
El Mahallawy, F.A.
Also, Adding magnesium to Al-Zn alloys increases the age hardening characteristics of the alloy.
Summary In the present work, Al-15Zn-2Mg alloy was tried to ECAP at lowest possible temperature.
El Aal, N.
El Mahallawy, F.A.
Online since: September 2013
Authors: Abdullah S. Al-Ayed, Omnia A.A. El-Shamy
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
Online since: May 2014
Authors: Hanadi G. Salem, El Sayed M.A. Rassoul, W.H. El-Garaihy
El-Garaihy1, a, El-Sayed M.A.
The presence of SiCp at the triple junctions and along the grain boundaries enhanced the rate of strain hardening of the Al-matrices and significantly refined the grain size.
Hv-values were measured along the disk cross section at indentation spacing's of 0.5 mm using a procedure described by Zhilyaev et al. [7].
El-Garaihy, and E.A.
Langdon," Ultrafine grains and the Hall–Petch relationship in an Al–Mg–Si alloy processed by HPT", Materials Science and Engineering, A 532 (2012), 139-145
The presence of SiCp at the triple junctions and along the grain boundaries enhanced the rate of strain hardening of the Al-matrices and significantly refined the grain size.
Hv-values were measured along the disk cross section at indentation spacing's of 0.5 mm using a procedure described by Zhilyaev et al. [7].
El-Garaihy, and E.A.
Langdon," Ultrafine grains and the Hall–Petch relationship in an Al–Mg–Si alloy processed by HPT", Materials Science and Engineering, A 532 (2012), 139-145
Online since: May 2022
Authors: Sara Kochoska, Thomas Neyer, Swapna Sunkari, Martin Domeij, Jimmy Franchi, Hrishikesh Das, Joshua Justice, Ho Jung Lee, Xue Qing Hu, Sotirios Maslougkas, Thanh Toan Pham
Fig. 6 shows Electroluminescence (EL) images captured from the backside for previously body diode stressed SiC MOSFETs during body diode forward bias with ISD=1 A and VGS=-4.5 V.
EL patterns can be seen in parts of the chip area where lead frame and solder was removed by mechanical polishing.
No specific features were seen in EL for samples with zero RDSon drift.
Kimoto et. al., “Understanding and Reduction of Degradation Phenomena in SiC Power Devices”, 2017 IEEE International Reliability Physics Symposium, Monterey CA, USA [2] R.
Neyer et. al., “Is there a perfect SiC MOSFETs Device on an imperfect crystal?”
EL patterns can be seen in parts of the chip area where lead frame and solder was removed by mechanical polishing.
No specific features were seen in EL for samples with zero RDSon drift.
Kimoto et. al., “Understanding and Reduction of Degradation Phenomena in SiC Power Devices”, 2017 IEEE International Reliability Physics Symposium, Monterey CA, USA [2] R.
Neyer et. al., “Is there a perfect SiC MOSFETs Device on an imperfect crystal?”
Online since: November 2017
Authors: Ahmed Zaki Farahat, Sherif Ali Abd El Rahman, Taha Mattar, Mohamed K. Elfawkhry, Ahmed Y. Shash
Designing, Processing and Isothermal Transformation of Al-Si Medium Carbon Ultrafine High Strength Bainitic Steel
Sherif Ali Abd El Rahman1,a, Ahmed Shash1,b, Mohamed K.
Increasing of the holding time from 24 hours to 73 hours shows a slight enhancement in the microstructure refinement. 1F (0.0 Al wt.%) 2F (0.1 Al wt.%) 3F (0.27 Al wt.%) 4F (0.65 Al wt.%) 5F (1.08 Al wt.%) 6F (1.16 Al wt.%) Figure 3: The microstructure for the 72 hours isothermal transformation Microstructure for 120 hours isothermal transformation Figure 4 shows the microstructure of the bainite structure after 120 hours isothermal transformation.
Increasing of the isothermal holding time leads to increase the amount of the bainite [20] [21]. 1F (0.0 Al wt.%) 2F (0.1 Al wt.%) 3F (0.27 Al wt.%) 4F (0.65 Al wt.%) 5F (1.08 Al wt.%) 6F (1.16 Al wt.%) Figure 4: The microstructure for the 120 hours isothermal transformation Figure 5 illustrate that the retained austenite island block is widely formed in steel 1F, while there is no austenite block observed at 4F.
El-Fawkhry, Sherif Ali Abd El Rahman, Iman S.
[25] Mohamed Kamal El-Fawkhry, Ahmed Shash, Sherif Ali, Hassan Bahaa and Taha Mattar, “Enhancement of pearlitic structure through inoculation with nano-size silicon carbide”, Int.
Increasing of the holding time from 24 hours to 73 hours shows a slight enhancement in the microstructure refinement. 1F (0.0 Al wt.%) 2F (0.1 Al wt.%) 3F (0.27 Al wt.%) 4F (0.65 Al wt.%) 5F (1.08 Al wt.%) 6F (1.16 Al wt.%) Figure 3: The microstructure for the 72 hours isothermal transformation Microstructure for 120 hours isothermal transformation Figure 4 shows the microstructure of the bainite structure after 120 hours isothermal transformation.
Increasing of the isothermal holding time leads to increase the amount of the bainite [20] [21]. 1F (0.0 Al wt.%) 2F (0.1 Al wt.%) 3F (0.27 Al wt.%) 4F (0.65 Al wt.%) 5F (1.08 Al wt.%) 6F (1.16 Al wt.%) Figure 4: The microstructure for the 120 hours isothermal transformation Figure 5 illustrate that the retained austenite island block is widely formed in steel 1F, while there is no austenite block observed at 4F.
El-Fawkhry, Sherif Ali Abd El Rahman, Iman S.
[25] Mohamed Kamal El-Fawkhry, Ahmed Shash, Sherif Ali, Hassan Bahaa and Taha Mattar, “Enhancement of pearlitic structure through inoculation with nano-size silicon carbide”, Int.
Online since: March 2004
Authors: Woo Jin Kim, Yong Suk Kim, J.S. Ha
Dry-sliding-wear behavior of ultra-fine grained 6061 Al alloy and AZ61 Mg alloy was
investigated.
The ARB processed 6061 Al alloy shows significantly increased hardness and strength until 4 cycles.
Values of hardness (H), yield stress (�0.2), tensile strength (�uts), and elongation (El) of the ARB processed 6061 Al alloy and the ECA pressed AZ61 Mg alloy Number of H �0.2 �uts El Number of H �0.2 �uts El ARB cycles [HV] [Mpa] [Mpa] [%] ECAP passes [HV] [Mpa] [Mpa] [%] As-received 82.7 135.1 279.3 17.4 As-extruded 66.1 215.7 321.8 33.1 1 107.5 267.8 288.8 3.1 1 72.1 191.6 299.9 34.8 2 108.7 361.9 381.1 3.1 2 72.7 204.5 319.3 37.9 3 119.8 318.1 336.1 3.7 3 74.5 214.5 331.4 34.5 4 137.4 322.6 351.3 2.9 4 78.8 199.6 317.3 44.5 5 86.8 261.1 294.1 2.1 6 72.6 201.6 330.3 34.3 6 84.4 200.1 233.6 2.1 8 72.3 161.1 313.4 54.1 7 80.2 218.3 244.1 2.8 Wear rates of the ARB processed Al alloy and the ECA pressed Mg alloy are plotted against number of cycles and passes in Fig. 3 and Fig. 4, respectively.
The poor wear resistance of the severely deformed Al and Mg alloys was attributed to their microstructure.
The high wear rate of the ARB processed Al alloy is attributed to the strain-induced grain coalescence.
The ARB processed 6061 Al alloy shows significantly increased hardness and strength until 4 cycles.
Values of hardness (H), yield stress (�0.2), tensile strength (�uts), and elongation (El) of the ARB processed 6061 Al alloy and the ECA pressed AZ61 Mg alloy Number of H �0.2 �uts El Number of H �0.2 �uts El ARB cycles [HV] [Mpa] [Mpa] [%] ECAP passes [HV] [Mpa] [Mpa] [%] As-received 82.7 135.1 279.3 17.4 As-extruded 66.1 215.7 321.8 33.1 1 107.5 267.8 288.8 3.1 1 72.1 191.6 299.9 34.8 2 108.7 361.9 381.1 3.1 2 72.7 204.5 319.3 37.9 3 119.8 318.1 336.1 3.7 3 74.5 214.5 331.4 34.5 4 137.4 322.6 351.3 2.9 4 78.8 199.6 317.3 44.5 5 86.8 261.1 294.1 2.1 6 72.6 201.6 330.3 34.3 6 84.4 200.1 233.6 2.1 8 72.3 161.1 313.4 54.1 7 80.2 218.3 244.1 2.8 Wear rates of the ARB processed Al alloy and the ECA pressed Mg alloy are plotted against number of cycles and passes in Fig. 3 and Fig. 4, respectively.
The poor wear resistance of the severely deformed Al and Mg alloys was attributed to their microstructure.
The high wear rate of the ARB processed Al alloy is attributed to the strain-induced grain coalescence.
Online since: July 2014
Authors: K. Kathiresan, M. Venkatesan, J. Adhavan
Ting-long et al. [6] studied the frictional heating on Brake materials.
El-Tayeb and Liew [7] analyzed the effect of water spray on the friction behavior of brake pads.
El-Sherbiny, Wear, 34 (1975) 311
El-Tayeb and K.W.
EL-Tayeb and K.W.
El-Tayeb and Liew [7] analyzed the effect of water spray on the friction behavior of brake pads.
El-Sherbiny, Wear, 34 (1975) 311
El-Tayeb and K.W.
EL-Tayeb and K.W.
Online since: April 2010
Authors: Chin-Pao Cheng, C.H. Liu, C.H. Tesng
This guest-host hybrid layer prepared in an OLED structure is crucial for enhancing
electroluminescence (EL) efficiency.
Among the several layers comprising the OLEDs, the EL efficiency of devices is significantly improved by the insertion of HBLs.
Result and discussion The device with a structure of ITO/NPB (50 nm) /TBADN:BCzVB (W%, 40 nm) /BCP (Y nm)/Alq3 (10 nm) /Al (200 nm) was fabricated in this study.
In order to investigate the effect of BCzVB dye doping on the EL characteristics of the device, a device with a structure of ITO/NPB (50 nm)/TBADN:BCzVB (W%, 40 nm)/Alq3 (10 nm)/Al (200 nm) was fabricated, where the deposition rate ratio W% of BCzVB to TBADN was varied from 2 to 14%.
EL spectra of the device for a TBADN emitter doped with different concentrations of BCzVB.
Among the several layers comprising the OLEDs, the EL efficiency of devices is significantly improved by the insertion of HBLs.
Result and discussion The device with a structure of ITO/NPB (50 nm) /TBADN:BCzVB (W%, 40 nm) /BCP (Y nm)/Alq3 (10 nm) /Al (200 nm) was fabricated in this study.
In order to investigate the effect of BCzVB dye doping on the EL characteristics of the device, a device with a structure of ITO/NPB (50 nm)/TBADN:BCzVB (W%, 40 nm)/Alq3 (10 nm)/Al (200 nm) was fabricated, where the deposition rate ratio W% of BCzVB to TBADN was varied from 2 to 14%.
EL spectra of the device for a TBADN emitter doped with different concentrations of BCzVB.