1,027 research outputs found
A Decision Support System For The Selection of The Optimum Contractor
No full textA Thesis Submitted For The Degree of Doctor of PhilosophyAwarding the tender to the lowest bidder can result in potentially serious problems, which necessitate the need for including a wide range of other criteria This will form the basis of selection, where some of these criteria will be contractor reated and others will relate to the specific characteristics of the project and the requirements and objectives of the project under consideration. This research was divided into six phases
Mecaster duncani Mohamed Abdelhamid & Moustafa Azab 2012, n. comb.
No full textMecaster duncani (Fourtau, 1906) n. comb. (Figs 15N; 17F) Linthia duncani Fourtau, 1906: 162, pl. 3, figs 1-4. Periaster duncani – Abdelhamid & El Qot 2001: 29, fig. 7N. MATERIAL EXAMINED. — 29 specimens from the Turonian (Wata Formation) of Wadi Dakhl, ASUDLE187-215, Wadi Dakhl echinoid horizon 1 (DEH 1) and 18 from the same stage of Wadi Abu Qaada, ASUAQE170-187, Wadi Abu Qaada echinoid horizon 1 (QEH 1). MEASUREMENTS. — See Table 15. DESCRIPTION Test polygonal.Maximum width lies slightly behind the distal ends of anterior paired petals. Apical disc semi-ethmolytic, transverse, centric to slightly eccentric anteriorly.Frontal ambulacrum nonpetaloid, and relatively deep.Paired ambulacra deep, wide, and petaloid. Peristome pentagonal, transverse, and labiates. There are two types of fascioles: a wide band of peripetalous ortho- to parafasciole (sensu Néraudeau et al. 1998) and a fine band of lateroanal parafasciole. R EMARKS Many authors considered that the post-Cenomanian Mecaster Pomel, 1883 species can develop two fascioles (peripetalous and latero-anal) in fine grained sediments (Lambert 1921; Zaghbib-Turki 1989, 1990; Néraudeau 1994; Villier et al. 2004). Accordingly, many species previously referred to Periaster d’Orbigny, 1853 are attributed to Mecaster (bifasciata ecological varieties of the typical Mecaster species). The present species has long, sub-equal, moderately depressed paired petals. The apical disc is semi-ethmolytic (madreporite separates genital plates 1and 4). Fascioles are composed of a wide band of peripetalous ortho- to parafasciole sensu Néraudeau et al. (1998) and a narrow band of latero-anal parafasciole sensu Néraudeau et al. (1998; bifasciata stage). The labrum is triangular and long, and the sternal plates are approximately symmetric (Fig. 17F). These characters refer this species to genus Mecaster.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 607-608, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
FIG. 1 in Turonian-Santonian echinoids from Egypt
No full textFIG. 1. — Location map showing the localities (�) from which the present material was collected in Egypt.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 577, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
sj-tiff-1-dos-10.1177_15593258221076711 – Supplemental Material for Withania somnifera Modulates Radiation-Induced Generation of Lung Cancer Stem Cells via Restraining the Hedgehog Signaling Factors
No full textSupplemental Material, sj-tiff-1-dos-10.1177_15593258221076711 for Positive Cofactor 4 as a Potential Radiation Biodosimeter for Enas Mahmoud Moustafa, Hemat Sameeh Abdel Salam and Somaya Zakaria Mansour in Dose-Response</p
sj-tiff-2-dos-10.1177_15593258221076711 – Supplemental Material for Withania somnifera Modulates Radiation-Induced Generation of Lung Cancer Stem Cells via Restraining the Hedgehog Signaling Factors
No full textSupplemental Material, sj-tiff-2-dos-10.1177_15593258221076711 for Positive Cofactor 4 as a Potential Radiation Biodosimeter for Enas Mahmoud Moustafa, Hemat Sameeh Abdel Salam and Somaya Zakaria Mansour in Dose-Response</p
Numerical Study for Progressive Failure of High Rise Stepped Steel Building
No full textAbstract: Progressive collapse of a structure happens when one or more primary members are suddenly lost due to an unfortunate accident such as a gas explosion, bomb attack, fire, or overloaded. Building irregularity is one aspect that might aggravate the damage caused by gradual failure. The progressive failure of high rise stepped frames was investigated using 3-dimensional modelling and the finite element approach in this paper. The steel structure has 30 stories and rigid moment-resisting steel frames. Abaqus software is used to perform nonlinear dynamic analysis in accordance with GSA criteria. The results of Abaqus model are verified with an experimental data and good agreement is achieved. The structural behaviour of the building under sudden column loss was studied in detail using this model for several scenarios of column removal.
Keywords: Progressive failure; Nonlinear dynamic analysis; High rise steel building; Finite element; Column removal.
Title: Numerical Study for Progressive Failure of High Rise Stepped Steel Building
Author: Mohamed Basel Emara, Sameh Moustafa Gaawan, Mahmoud Shahat Mahmoud, Mohamed Mohamed Yahia
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
Vol. 10, Issue 1, April 2022 - September 2022
Page No: 110-118
Research Publish Journals
Website: www.researchpublish.com
Published date: 20-June-2022
DOI: https://doi.org/10.5281/zenodo.6670584
Paper Download Link (Source)
https://www.researchpublish.com/papers/numerical-study-for-progressive-failure-of-high-rise-stepped-steel-buildingInternational Journal of Civil and Structural Engineering Research, ISSN 2348-7607 (Online), Research Publish Journals (Publisher), Website: www.researchpublish.co
Mecaster roachensis Mohamed Abdelhamid & Moustafa Azab 2012, n. comb.
No full text<i>Mecaster roachensis</i> (Gauthier, 1900) n. comb. (Fig. 15O) <p> <i>Periaster roachensis</i> Gauthier <i>in</i> Fourtau, 1900: 24, pl. 1, figs 13-15. — Abdelhamid 1997: 156, fig. 7 (9, 10).</p> <p>MATERIAL EXAMINED. — Two well preserved and numerous incomplete specimens from Abu Roash: Turonian (rudist unit), ASUARE152, Abu Roash echinoid horizon 1 (REH 1) and the Coniacian-Santonian (Ostrea and Plicatula unit), ASUARE153, Abu Roash echinoid horizon 4 (REH 4).</p> <p>DESCRIPTION</p> <p>Test size variable (L = 14.5-40.0mm) but mostly has large size. Outline heat-shape (W/L = 0.91-0.95).</p> <p>Anterior margin with a marked sulcus. Adapical surface sloped forwards. Maximum height lies directly behind apical disc (H/L = 0.62-0.70). Posterior surface with oblique to nearly vertical truncation. Adoral surface swollen at the plastron. Sternal plates are approximately equal. Apical disc semi-ethmolytic, centric, and transverse. Frontal ambulacrum nonpetaloid (NIII = 40), deep, wider than the paired petals and conspicuously notching the ambitus until the peristome. Paired ambulacra petaloid, deep, and relatively narrow. Anterior paired petals long (LII = 7.8-13.9 mm, NII = 30- 45). Posterior paired petals shorter (LI/LII = 0.80, NI = 30-45), narrower, and less divergent than the anterior paired petals.</p> <p>REMARKS</p> <p> This species has fairly long, slightly depressed paired petals. The posterior pair is relatively shallower and shorter than the anterior one. The apical disc is semi-ethmolytic (the madreporite separates the genital plates 1 and 4). Fascioles are a narrow band of peripetalous ortho- to parafasciole <i>sensu</i> Néraudeau <i>et al.</i> (1998) and a narrow band of lateroanal parafasciole (bifasciata stage). The labrum is triangular and long. The sternal plates are nearly symmetric. As discussed in the previous species, regards the relation between the two genera <i>Periaster</i>, d’Orbigny, 1853 and <i>Mecaster</i>, the characters of the present species attribute it to the genus <i>Mecaster</i>. <i>Mecaster roachensis</i> n. comb. is distinguished from <i>Mecaster fourneli</i> in having lateroanal parafascioles, maximum width lies at the mid distance between anterior and posterior of test, more centric apical disc, and wider frontal ambulacrum.</p>Published as part of <i>Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3)</i> on page 608, DOI: 10.5252/g2012n3a7, <a href="http://zenodo.org/record/5378120">http://zenodo.org/record/5378120</a>
Behaviour of high rise irregular plan steel building in progressive failure due to sudden column removal
No full textAbstract: Progressive failure can be described as step-by-step failure in building caused by the sudden loss of one or a few structural elements, which generates a chain reaction of failures for the adjacent structural elements, which leads to the entire structure failing. One of the factors that can amplify the damage caused by progressive failure is building irregularity. Three dimensional modeling, using the finite element method was developed to investigate the progressive failure of high rise irregular plan building consist of 30 storey with rigid moment resisting steel frames. Non-linear dynamic analysis is carried out following GSA guidelines using ABAQUS software. The modeling techniques were described in detail. The obtained numerical results are compared with experimental data and good agreement is attained. Using this model, the structural behavior of the building under the sudden columns loss for different scenarios of column removal were assessed in detail.
Keywords: Progressive failure; Nonlinear dynamic analysis; High rise steel building; Finite element; Column removal.
Title: Behaviour of high rise irregular plan steel building in progressive failure due to sudden column removal
Author: Mohamed Basel Emara, Sameh Moustafa Gaawan, Mahmoud Shahat Mahmoud, Mohamed Mohamed Yahia
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
Vol. 10, Issue 1, April 2022 - September 2022
Page No: 99-109
Research Publish Journals
Website: www.researchpublish.com
Published date: 12-June-2022
DOI: https://doi.org/10.5281/zenodo.6635695
Paper download Link (Source)
https://www.researchpublish.com/papers/behaviour-of-high-rise-irregular-plan-steel-building-in-progressive-failure-due-to-sudden-column-removalInternational Journal of Civil and Structural Engineering Research, ISSN 2348-7607 (Online), Research Publish Journals
Website: www.researchpublish.co
A general two dimensional study of the power reflection in microwave detected photoconductance decay technique for lifetime measurement
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