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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.
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: Sheng Dong Pan, Xiang Jing An, Han Gen He, Hong Tao Xue
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.
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: October 2013
Authors: Jia Jun Li, Nai Qin Zhao, Da Ran Fang, Feng Fang Liu, Fang Li
Al-2.8wt.
Experimental Procedure Cast Al-2.8wt.
Results and discussion Fig. 1 shows the microstructure of Al-2.8%Mg samples.
Weight loss of Al-2.8%Mg specimens after immersion in 3.5% NaCl solution for 120h.
El-Danaf, M.S.
Experimental Procedure Cast Al-2.8wt.
Results and discussion Fig. 1 shows the microstructure of Al-2.8%Mg samples.
Weight loss of Al-2.8%Mg specimens after immersion in 3.5% NaCl solution for 120h.
El-Danaf, M.S.
Online since: September 2019
Authors: Aissa Kerkour-El Miad, Redouane Kouddane, Abdelhamid Kerkour El-Miad
Grain Shape Effect and the Viscoplastic Parameter on the Evolution of Isotropic and Kinematic Hardening of Metallic Materials under Cyclic Loading
Abdelhamid Kerkour-El Miad1*, Aissa Kerkour-El Miad2, R.
Summarized in (Table 1), these model constants are chosen as in Dingli et al. (2000) [7].
Indeed, for the sake of simplicity and based on some obtained results (e.g., Abdul-Latif et al., 2008) [9], it is considered that the values of h1= h2= h3= h4= h5=1.
[6] Kerkour-El Miad A.,’’ Modélisation micromécanique du comportement cyclique des polycristaux sous chargement multiaxiaux à déformation et à contrainte imposées avec l’effet de la forme du grain’’ Thèse de doctorat, Université Pierre et Marie Curie(2011) [7] Dingli, J.
Summarized in (Table 1), these model constants are chosen as in Dingli et al. (2000) [7].
Indeed, for the sake of simplicity and based on some obtained results (e.g., Abdul-Latif et al., 2008) [9], it is considered that the values of h1= h2= h3= h4= h5=1.
[6] Kerkour-El Miad A.,’’ Modélisation micromécanique du comportement cyclique des polycristaux sous chargement multiaxiaux à déformation et à contrainte imposées avec l’effet de la forme du grain’’ Thèse de doctorat, Université Pierre et Marie Curie(2011) [7] Dingli, J.
Online since: September 2015
Authors: B.C. Pai, T.P.D. Rajan, C Pavithran, S. Abhilash, J.P. Deepa
Lillo et al. work on Al 6061-B4C composite through powder metallurgy route has shown the presence of B4C particle agglomerates and residual porosity[5].
The 80%Al-20%-B4C, 80%Al-20%Cu-B4C and 80%Al-20%Ni-B-B4C powders were blended and mixed, uniaxially cold compacted at 1.2 tonnes load to form cylindrical pellet of 10 mm diameter and 15 mm height.
(a) (b) (c) Figure 1: (a) XRD micrographs of B4C and coated B4C, SEM micrographs of (b) El Cu coated B4C and (c) El Ni-B coated B4C particles under optimum condition The variation of radial apparent density of green and sintered composites with coated and uncoated B4C particles is depicted in Table 1.
An Al-Ni and Al-Cu intermetallic layer formed around the B4C particle reduces Al-B4C interfacial reaction products and melting temperature of the matrix, contributing better wetting of the B4C particles[11].
Fig. 2 shows the SEM microstructure of sintered samples of Al-B4C, Al-Cu-B4C, and Al-Ni-B-B4C composite prepared and the effect of coating on particle distribution.
The 80%Al-20%-B4C, 80%Al-20%Cu-B4C and 80%Al-20%Ni-B-B4C powders were blended and mixed, uniaxially cold compacted at 1.2 tonnes load to form cylindrical pellet of 10 mm diameter and 15 mm height.
(a) (b) (c) Figure 1: (a) XRD micrographs of B4C and coated B4C, SEM micrographs of (b) El Cu coated B4C and (c) El Ni-B coated B4C particles under optimum condition The variation of radial apparent density of green and sintered composites with coated and uncoated B4C particles is depicted in Table 1.
An Al-Ni and Al-Cu intermetallic layer formed around the B4C particle reduces Al-B4C interfacial reaction products and melting temperature of the matrix, contributing better wetting of the B4C particles[11].
Fig. 2 shows the SEM microstructure of sintered samples of Al-B4C, Al-Cu-B4C, and Al-Ni-B-B4C composite prepared and the effect of coating on particle distribution.
Online since: June 2014
Authors: Dong Jun Kim, Hui Wei Du, Kyuho Kim, Lu Peng, Heicheon Yang
The effects of various parameters such as primary nozzle area ratio, mixing tube length, diffuser angle and length on the ejector performance have been investigated by Sharma et al.[7], Kim et al.[8], Kumar et al.[9], Rogdakis and Alexis [10], Rainer et al. [1].
Mass transfer characteristics of ejectors using air or water as the primary fluid or the entrained fluid have been investigated by Park and Yang [11], Balamurugan et al.[12], Cramers and Beenackers [13] and Havelka et al.[14].
EL-Ghandour, I.A.
EL-Sawaf and F.M.
EL-Ottla: 6th Int.
Mass transfer characteristics of ejectors using air or water as the primary fluid or the entrained fluid have been investigated by Park and Yang [11], Balamurugan et al.[12], Cramers and Beenackers [13] and Havelka et al.[14].
EL-Ghandour, I.A.
EL-Sawaf and F.M.
EL-Ottla: 6th Int.
Online since: August 2016
Authors: Cari Cari, Ahmad Marzuki, Mukhayyarotin Niswati Rodliyatul Jauhariyah
El-Deen et al found that the absorption edge shifted to higher wavelength direction with increasing the ionic radius of the rare earth atoms.
Uma et al. [17] found the refractive index of lithium tellurofluoroborate about 1.612-1.628.
Himei, et al., Spectral properties of erbium-doped lead halotellurite glasses for 1.5mm broadband amplification, Optical Materials. 15 (2000) 123-130
El-Mallawany, R.D.
El-Deen, M.Sm Al Salhi, M.M.
Uma et al. [17] found the refractive index of lithium tellurofluoroborate about 1.612-1.628.
Himei, et al., Spectral properties of erbium-doped lead halotellurite glasses for 1.5mm broadband amplification, Optical Materials. 15 (2000) 123-130
El-Mallawany, R.D.
El-Deen, M.Sm Al Salhi, M.M.
Online since: October 2015
Authors: Si Yuan He
To solve this problem, H.T.El-Dessouky[4] proposed an evaporative cooling system integrated with hollow fiber membrane module, which would manage to pre-dehumidify the process air in a vacuum environment built by a vacuum pump.
[3] Min-Hwi Kim, Joon-Young Park, Min-Ki Sung, et al., Annual operating energy savings of liquid desiccant and evaporative-cooling-assisted 100% outdoor air system, Energy and Buildings. 76 (2014) 538-550
EL-Dessouky, H.
Li, et al., An experimental investigation on the integration of two-stage dehumidification and regenerative evaporative cooling, Applied Energy. 102 (2013) 1218-1228
Wu, et al., Analysis on a hybrid desiccant air-conditioning system, Applied Thermal Engineering. 26 (2006) 2393-2400
[3] Min-Hwi Kim, Joon-Young Park, Min-Ki Sung, et al., Annual operating energy savings of liquid desiccant and evaporative-cooling-assisted 100% outdoor air system, Energy and Buildings. 76 (2014) 538-550
EL-Dessouky, H.
Li, et al., An experimental investigation on the integration of two-stage dehumidification and regenerative evaporative cooling, Applied Energy. 102 (2013) 1218-1228
Wu, et al., Analysis on a hybrid desiccant air-conditioning system, Applied Thermal Engineering. 26 (2006) 2393-2400
Online since: October 2015
Authors: Kamel Mehdi, Moez Ben Jaber, Nawel Glaa
FE Study of the Chips Morphology when Drilling Process
Nawel Glaa1, a*, Kamel Mehdi1, 2, b and Moez Ben Jaber3, c,
1Corresponding Author: URMSSDT, Superior School of Sciences and Techniques of Tunis (ESSTT), University of Tunis (UT), 5 Avenue Taha Hussein P.B. 56 Bab Mnara 1008 Tunis, Tunisia
2Preparatory Institute for Engineering Studies El Manar (IPEIMa), University of Tunis EL Manar (UTM), PB. 24, 2092 Tunis, Tunisia
3Engineering National School of Tunis (ENIT), University of Tunis EL Manar (UTM), 1068 Tunis, Tunisia
aglaanawel@hotmail.com., b kamel_mehdi2002@yahoo.fr, c moez_benjaber@yahoo.fr
Keywords: drilling process, 3D finite element study, chip forming
Abstract.
These results are consistent with the results obtained from the experimental study by Zitoune and al. [10] Fig 4.
Zhang, et al., Predicting the Effects of Cutting Parameters and Tool Geometry on Hard Turning Process Using Finite Element Method.
These results are consistent with the results obtained from the experimental study by Zitoune and al. [10] Fig 4.
Zhang, et al., Predicting the Effects of Cutting Parameters and Tool Geometry on Hard Turning Process Using Finite Element Method.