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Online since: February 2009
Authors: Ze Kun Yao, Hong Zhen Guo, Yong Quan Ning, Yi Wen Zhang, Tao Yu
Experimental procedures A HIPed bar of PM FGH4096 alloy with diameter of 30mm was studied, and chemical compositions as follows (mass fraction in %): C, 0.02-0.05; Al, 2.0-2.4;W, 3.8-4.2;Nb, 0.6-1.0;Mo, 3.8-4.2;Ti, 3.5-3.9;Cr, 15.5-16.5;Co, 12.5-13.5; Fe,< 0.5;B, 0.006-0.015;Mn, <0.15;Zr, 0.025-0.05;Si, <0.20;P,< 0.015;S, < 0.015;H, <0.001; N,< 0.005;O,< 0.007; and Ni balance.
Table 1 also shows that the alloy upseted and heat treated has %EL and RA values well above those specified for wrought material, while the strength are comparable to those of HIP + heat treated alloy.
Table 1 Room-temperature tensile properties of FGH4096 alloy Processing conditions 0.2%YS (MPa) UTS (MPa) %EL %RA HIPed and heat treated 1200 1550 18.0 18.0 Upseted and heat treated 1220 1560 19.0 32.5 Ultrafine-grained treated and heat treated 1470 1730 15.0 23.5 The 750℃ tensile properties of the FGH4096 alloy under different conditions were given in Table 2.
It can be seen from the table that the YS and UTS of alloy multiple forged and heat treated higher than the values of HIPed and heat treated alloy (by about 10% and9%, respectively), while the % EL and % RA were substantially high(by about 220% and 163% , respectively).
Table 2 750℃ tensile properties of FGH4096 alloy Processing conditions 0.2%YS (MPa) UTS (MPa) %EL %RA HIPed and heat treated 1040 1200 5.0 8.0 Upseted and heat treated 1120 1320 7.5 14.0 Ultrafine-grained treatment and heat treated 1140 1310 16.0 21.0 3.3 Fractography The fractured surfaces of the alloy processed under different conditions were examined to correlate the fracture characteristics with the structure and properties.
Online since: October 2010
Authors: Giuseppe Lucibello, Giuseppe Brandonisio, Elena Mele, Antonello De Luca
In this paper, four basilica churches strongly damaged during the l'Aquila earthquake, are analyzed through a "two-step" procedure, developed by the authors in Mele et al. (1999).
The comparison between the results of the modal analyses associated to the design spectrum suggested by the NTC'08 and the recorded spectrum (Fig. 5), in the following appointed as "06/04/09", shows slight scatters in term of base shear force, with base shear action V in order of 30% of the vertical load Wtot both in transversal and longitudinal direction (Fig. 6). 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 T(s) Se(g) Mainshock 06/04/09 AQK NTC '08 EL NTC '08 PR (q=2.8) Figure 5: Comparison among main shock spectrum (06/04/09 AQK), elastic (EL) and design (PR) spectra provided by Italian code NTC'08 Transversal direction 0% 20% 40% 60% SMC SG SPC SS V/Wtot 06/04/2009 NTC'08 EL Longitudinal direction 0% 20% 40% 60% SMC SG SPC SS V/Wtot 06/04/2009 NTC'08 EL Figure 6: Normalized base shear in the four churches: NTC'08 VS. 06/04/09 main shock Non Linear Static Analyses In the second step of the analysis
More details concering the application on such approach to masonry modeling can be found in Brandonisio et al. (2008) The results of the analyses on the single structural elements allow for deriving push-over curves, stress distributions, collapse modes and ultimate horizontal strengths; in this paper, for sake of brevity, only the values of ultimate lateral strength are discussed, particularly in the comparison with the strength demand obtained for each macro-element in the first step of the procedure.
Online since: September 2013
Authors: Xiang Jing An, Sheng Dong Pan, Hong Tao Xue, Han Gen He
Funt et al. generalize the Franckle-McCann algorithm to cope with arbitrary size of input images[6], where the effect of different parameter settings is discussed as well.
In order to avoid ambiguity of subjective evaluation, we measure the distortions in the result images quantitatively using the dynamic-range-independent image quality assessment metric proposed by Aydin et al. in [1].
The percentage of three types of distortions, contrast reversal (Er), loss of visible contrast (El), and amplification of invisible contrast (Ea), respectively, and the average distortion error (Eavg) are listed in Table I.
Performance Comparison image the proposed method [14] [11] Er El Ea Eavg Er El Ea Eavg Er El Ea Eavg Foggy night 2.21 4.03 0.59 2.28 12.45 3.51 58.76 24.91 5.04 3.46 37.61 15.37 Cathedral 11.87 15.12 4.94 10.64 18.94 28.03 29.32 25.43 16.63 16.88 35.78 23.10 Memorial 8.92 18.86 0.60 9.46 19.67 21.83 11.17 17.56 17.68 5.84 14.63 12.72 Desk 12.03 31.26 1.23 14.84 21.32 50.41 4.22 25.31 28.92 12.64 23.72 21.76 References [1] T.
Online since: September 2011
Authors: Adrian Sichau, Stefan Ulbrich
The massive interest in robust optimization over thepast fifteen years was triggered by the work of Ben-Tal and Nemirovski, e.g. [1, 6, 2] and El Ghaoui et al. [7, 8].
This has been proposed by Ben-Tal and Nemirovski, e.g. [1, 6, 14], and El Ghaoui et al. [7, 8] for conic optimization problems and has been adjusted to general nonlinear optimization problems with state equations by Diehl et al
El Ghaoui, H.
El Ghaoui, F.
El Ghaoui.
Online since: January 2022
Authors: Elhoucine Essefi, Houda Besser, Ali Benour, Yosra Ayadi, Younes Hamed, Faten Khelifi, Sana Bedoui
., Sidi El Hani and Chott Djerid) with layers of brine a few centimeters deep.
Tlig, Geochemical and hydrogeological studies of a sodium sulphate deposits: the case of Sabkhet El Ghine Oum El Khialate, southeast Tunisia, Carbonates and Evaporites, 29 (2014) 299-307
El-Sayed, A.
Al Gamal, R.
El-Sayed, A.
Online since: February 2011
Authors: Tong Min Wang, Jun Xu, Zong Ning Chen, Jing Zhu, Hong Wang Fu, Ting Ju Li
Introduction In the past decade, considerable efforts have been made on the TiB2 particulate reinforced Al/Al alloy composites.
In-situ TiB2/Al alloy composites are prepared by the in-situ reactions between the elements or compounds and the molten Al alloy.
We can see that α-Al grains are fine and spherical.
The average size of α-Al grains was calculated to be 47.4μm.
References [1] N.El-Mahallawy, M.A.
Online since: February 2011
Authors: Chang Xu Hu, Tungwai Leo Ngai, Wei Zheng, Heng Xie, Yuan Yuan Li
El-Raghy, J.
Huang. et al.
El-Raghy, M.W.
El-Raghy, M.W.
Gong, et al.
Online since: January 2010
Authors: S.A. Aly
Similar diffraction of amorphous WO3 thin films prepared by spin coater technique has been obtained by Hsu et. al. [17].
El Marssi, Applied Surface Science, 153 (1999) 1
El-Kadry, A.
El-Kadry, O.
El-Nahass and H.B.
Online since: July 2019
Authors: Johji Nishio, Chiharu Ota, Aoi Okada, Akihiro Goryu, Akira Kano, Satoshi Izumi, Mitsuaki Kato, Kenji Hirohata
An n-type drift layer (nitrogen [N] ≈ 1 × 1016 cm−3; 10 μm thick) was grown epitaxially and a p-type layer (aluminum [Al] ≈ 3 × 1020 cm−3; 1 μm thick) was implanted on the substrate.
(a) EL image of the p-i-n diode, with red arrows indicating the direction of applied stress.
(a) EL image of p-i-n diode with red arrows indicating the direction of applied stress.
(a) EL image of p-i-n diode with red arrows indicating the direction of applied stress.
(a) EL image of p-i-n diode with red arrows indicating the direction of applied stress.
Online since: October 2010
Authors: Peng Liu, Li Zhong Jiang, Ling Kun Chen
Hysteretic Analysis Model of LRB Nonlinear Simulation for Hysteretic Curve of LRB Many experiments results indicate that load-deformation relationship of LRB is nonlinear, Wen et al [4] presented differential hysteretic resorting force model by lots of research on dynamic hysteretic characteristics of structure, For reducing designing calculation, hysteretic curve of LRB can be simplified to bilinear curve, so equivalent bilinear model of hysteretic characteristics of LRB is established.
Table1 Dimension and calculation parameters of LRB Design schemes Diameter of rubber (mm) Diameter of lead plug (mm) Height of LRB(mm) Yield load(kN) Pre-yield stiffness (kN/m) Post-yield stiffness (kN/m) 1 800 100 190 70.6 23930.1 3681.5 2 800 120 190 101.6 25474.4 3919.1 3 800 140 190 138.3 27299.5 4199.9 4 800 160 190 180.7 29405.3 4523.9 Selection of Seismic Ground Motions and Train Traveling Load In this paper, three strong earthquake records are selected in this paper , El Centro, Taft and Parkfield earthquake record are selected to calculate responses of bridge structure, length of be confined to, the paper list only the computation results of seismic ground motions of El Centro earthquake.
Dynamic time-history responses are calculated by inputing different strong motion recordings, speeds and earthquake strength, length of be confined to, the paper list only the computation results of seismic ground motions of El Centro earthquake under train load at speed of 350km/h.
Moss, Nigel Cooke, et al: The Behavior of Bearings Used for Seismic Isolation under Shear and Axial Load.
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