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Search Results: 1 - 10 of 412264 matches for " Islam M. Ezz El-Arab "
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Soil Structure Interaction Effects on Pushover Analysis of Short Span RC Bridges  [PDF]
Islam M. Ezz El-Arab
Open Journal of Civil Engineering (OJCE) , 2017, DOI: 10.4236/ojce.2017.73024
Abstract: A three dimensional finite element of nonlinear pushover analysis for short span Reinforced Concrete (RC) bridge with circular piers cross section is modeling to present effects of soil structural interaction (SSI). Structural elements models are including linear foundation springs modeling, and nonlinear RC piers modeling. The paper succeeded to present the SSI effects of nonlinear pushover analysis of short spans RC bridges to determine the significant effects on dynamic characteristics and displacement capacity of short span RC bridges performance; that is increasing within range 11% to 20% compared to baseline pushover analysis of bridge without SSI effects. Results show the bridge stiffness decreases due to SSI effects on the bridge support for more flexible soils types that generates large displacement, with corresponding less base shear in bridge piers and footings by average percentage 12% and 18%, which is important for structural evaluation for new bridge construction and also, for strengthening and repair works evaluation of existing bridges.
Web Shear Strengthening Technique of Deep Precast Prestressed Hollow Core Slabs under Truck Loads  [PDF]
Islam M. Ezz El-Arab
Journal of Building Construction and Planning Research (JBCPR) , 2017, DOI: 10.4236/jbcpr.2017.54010
Abstract: Precast prestressed Hollow Core Slabs (HCS), are one of the famous and widely used slabs for concrete structures all over the world and widely implemented in the Middle East. HCS are used in industrial, commercial, residential buildings, as well as, in the parking structures. This paper succeeded to present new special details for deep HCS to enhance and strengthen the web shear strength capacity of HCS 400 and 500 mm depths respectively at the open parking area. This is subjected to heavy truck wheel loads so as to achieve the LRFD Code’s requirements. However, it is noticed many web shear cracks of HCS are used at parking area at many projects in Gulf Region. On the other hand, ACI318-14 permits no shear reinforcement in prestressed HCS thickness of less than 12.5 in (320 mm). The paper presents experimental tests program, to verify the numerical finite element of deep HCS under maximum design uniform loads, in addition to the new strengthening techniques. New strengthening techniques succeed to enhance the web shear capacity by significant percentage, due to the new details for HCS 400 by 68% up to 256% increasing of the web shear capacity compared to the ordinary HCS section. Also, HCS 500 shear capacity is enhanced with different percentages of strengthening techniques by 55%, up to 197% based on the different cases of strengthening. Furthermore enhancing deep HCS shear performance; the new techniques have an advantage of an easy execution at the site; casting with structural topping, otherwise the preparation can be done in precast factory before site handover, which saves time and cost compared to the others traditional strengthening techniques.
Analytical methodology of Seismic Fragility Curve for Reinforcement Concrete Pier Bridges in Egypt
Islam Ezz El-Arab
International Journal of Engineering and Advanced Technology , 2012,
Abstract: A seismic vulnerability evaluation method based onstructural analysis for RC bridges with simple pier bents isproposed in the paper. The proposed method is based on thehypothesis of the flexible pier-rigid deck behavior of the structuresubjected to transversal seismic loads. A flexible pier-rigid decksimplified model was therefore developed. This model has beenchosen after verifying the correlation between the responses of theproposed model and of the real structure which was presented byEgyptian General Authority of Roads and Bridges. The damageproduced by the earthquake load is centered on the piers of thebridge, while the dynamic study of the deck can be performed afterthe structural analysis of the piers in an uncoupled way. Themaximum damage of the piers under seismic actions is theprincipal aim of the proposed structural evaluation methodology.A damage index is used for this purpose, which describes the stateof the material at each point of the structure. The study success topresent the fragility curves which show that the peak groundacceleration for 50% probability of exceeding slight, moderate andsever damage ranges from approximately 0.15 to 0.4 g for thistypical and repeated RC bridge in Egypt.
A Diet Rich in Leafy Vegetable Fiber Improves Cholesterol Metabolism in High-Cholesterol Fed Rats
A.M. Ezz El-Arab
Pakistan Journal of Biological Sciences , 2009,
Abstract: In the present study, the hypocholesterolemic effect of leaf vegetable (Jew's mallow) was studied in high-cholesterol fed rats. The animals were fed diets supplemented with cholesterol (0.25%) for 4 weeks. Leaf vegetable diet produced an important hypocholesterolemic action: it led to a significant lowering (p<0.05) of cholesterol in the plasma and liver, as well as of the atherogenic index and a significant increase (p<0.05) in cecal short chain fatty acids, with respect to the control group. Concurrently, total fecal neutral sterols in the excretion increased (p<0.05) and apparent absorption of dietary cholesterol was significantly depressed (-58%). The consumption of leaf vegetable (Jew's mallow) with a hypercholesterolemic diet improved the lipidemic profile and increased excretion of the total cholesterol end-products.
Growth Rate Assessment of Alcyonacean Sarcophyton glaucum from Northern Hurghada, Red Sea, Egypt  [PDF]
Tarek A. A. Mohammed, Abdel-Hamid A. Ali, Mohamed M. El-Komi, Mohammed A. H. Ezz El-Arab, Fayez A. M. Shoukr
Natural Resources (NR) , 2016, DOI: 10.4236/nr.2016.76033
Abstract: Eighteen specimens of the soft coral Sarcophyton glaucum have been collected and tagged to determine the growth rate using the weight variations technique and to investigate the reproductive season histologically. Six colonies were totally weighed and 12 fragments (produced from three colonies) were marked and weighed. Some samples showed sever shrinkage that lead to death. The maximum semiannual growth rate was recorded in summer (30.05 gm/6 m). The average monthly growth reached 3.95 gm/month. Many factors affect the growth rate such as water currents, turbidity, sedimentation, temperature and reproduction process. The studied species is a dioecious species (unisex), where the Autozooid polyps are the reproductive organs while siphonozooids are sterile. Female gonads were observed to develop at late July before male gonads which began at late September. Larvae releasing started at late January and the gonads are completely spawned in February. Fertilization occurs internally to form planulae larvae which librated completely in February. The oogenesis exhibited prolonged about 23 months, which gave rise to oocytes of different developmental stages in female colonies at any given time, and a spermatogenic cycle of only 10 - 12 months.
Effect of dietary honey on intestinal microflora and toxicity of mycotoxins in mice
Aly M Ezz El-Arab, Shenouda M Girgis, Eman M Hegazy, Azzat B Abd El-Khalek
BMC Complementary and Alternative Medicine , 2006, DOI: 10.1186/1472-6882-6-6
Abstract: Production of biomass and toxins by Aspergillus parasiticus and Aspergillus ochraceus were followed in media without and with honey. Although aflatoxins and ochratoxin A. were administrated to male Swiss albino mice up to 1 μg and 10 ng/kg body weight/day respectively. The experimental animals were fed diets without our with 10% honey for two months. The changes in colonic probiotic bacteria, determintal colon enzyme glucuronidases, and genotoxicity were followed.Addition of 32% in its media increased the biomass of A parasiticus, while the biomass of A. ochraceus decreased and Ochratoxin A. was not produced. When the honey was added at the ratio of 32 and 48% in the medium. No relationship was found between mycelium weight and production of mycotoxins. Oral administration of aflatoxins (mixture of B1, B2, G1 and G2) and Ochratoxin A. induced structural and numerical chromosomal aberrations in bone marrow and germ cells of male mice, whereas, honey treatment reduced the genotoxicity of mycotoxins. Also both toxins induced histopathological changes in liver and kidney. Feeding on diet supplemented with honey improved the histopathological changes in case of aflatoxin group, but not in the case of ochratoxin A. group (except of kidney in two cases). No significant differences were found in the activity of colon β-glucuronidase between group fed diet with or without honey. On the other hand, the colon bifido bacteria and lactobacilli counts were increased markedly in group receiving diet supplemented with honey.Substituting sugars with honey in processed food can inhibit the harmful and genotoxic effects of mycotoxins, and improve the gut microflora.Foods are no longer appreciated by consumers only in terms of its taste and immediate nutritional needs, but also in terms of its ability to provide specific health benefits. Functional foods became an important food sector promoting health benefits via functional ingredients in these products. Functional foods targeted tow
Effectiveness of Apricots (Prunus armeniaca), Pomegranate (Punica granatum) Juice and Lactic Acid Fermented Sobya on Plasma Levels of Lipid Profile Parameters and Total Homocysteine among Egyptian Adults  [PDF]
Laila Hussein, Emam A. Abdel-Rahim, Abd El-Moneim MR Afify, Aly Ezz El-Arab, Eid Labib
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.522236
Abstract: Objectives: The aim of this study was to investigate the effectiveness of dietary intervention with apricots, pomegranate juice or lactic acid fermented sobya on improving the plasma levels of lipid profile parameters and total plasma homocysteine (tHcy) among healthy adults. Design of the study: Thirty-five men and women (28.9 ± 3.0 years) with mean body mass index of 23.5 ± 1.2 kg/m2 were randomly assigned to a dietary intervention study. During the pre-feeding study records of 24-hour food intake, anthropometric measurements and blood sampling were collected for biochemical investigations. Thereafter the volunteers were divided into five groups: a control group (C); the other four groups received daily one of the following supplements: 200 g of deep yellow apricots (Prunus armeniaca) (AF); 250 g pomegranate (Punica granatum) juice (PJ); mixture of 100 g (PJ) and 150 g of fermented sobya (FS), (PJ-FS) or 165 g (FS). After completing the three-week dietary intervention, blood samples were collected and blood indices were again evaluated. Biochemical analysis of total lipids (TL), total glycerides (TG), total cholesterol (TC) and high density lipoprotein cholesterol (HDL-C) and tHcy were completed. The low density lipoprotein-cholesterol level and three indices of risk factors were calculated using the appropriate equations. Results: Three-week dietary intervention improved the levels of lipid profile parameters TG, TC, HDL-C and LDL-C as compared to the respective baseline levels and the response of the control group that did not receive any supplement. Consuming (PJ-FS) had a synergistic beneficially added value on some of the above mentioned lipid profile parameters. The mean plasma tHcy concentrations; a marker for occlusive vascular disease was reduced significantly following the three week consumption of (PJ) or (FS), compared with the respective pre-feeding levels. Conclusion: Pomegranate juice (PJ) or lactic acid fermented sobya (FS) or mixture of both are potential natural agents in lowering the plasma levels of lipid profile parameters and tHcy among apparently healthy young women and men, without dyslipidemic symptoms.
Evaluation of the daily iron intake by non-breastfed Egyptian infants and young children.
AM El-Arab, M Mohammad, M El-Sayed
African Journal of Food, Agriculture, Nutrition and Development , 2009,
Abstract: Iron deficiency is frequently associated with anaemia. The prevalence of anaemia among Egyptian infants and young children is 25%. Fortification of infant and followup milk-based formulae remains a valuable method for delivering iron to reduce the incidence of iron deficiency anaemia. Percentage of Egyptian non-breastfed children consuming milk or milk products (7-23 months) are 79.1%. No studies have focused on infant and follow-up milk-based formulae that are marketed in Egypt regarding iron fortification and consumption. The objective of the current study was to evaluate the intake of iron by non-breastfed Egyptian infants and young children. To achieve this goal the infant and follow-up milk based formulae brands and types, low – iron and iron – fortified, that are commercially available on the local market were collected. In addition, the iron concentration was determined in the collected formulae in relation to the label statements to ensure the correct intake. Finally, the actual daily intake of iron from formulae consumption was estimated in relation to the nutritional requirements. The CRM 1846 and 3126a were used for the precision and accuracy of the method. It was shown that the iron levels in all milk-based formulae were lower than those reported on the labels and ranged between 6.17 -10.98 mg/L. No significant difference was found between the average concentration of iron in lowiron formula brands (8.1±2.3 mg/L) and iron-fortified formula brands (8.6± 2.0 mg/L). The average levels of the iron in the infant formula brands were lower (p<0.05) than follow-up formula brands. Iron- fortified infant brand (0-6 months) met the DRI for iron. However, low-iron brands had iron intake of 5.5, 5.3, 4.7 mg/day in the 4th month, 5th month, and 6th month, respectively, and were below the DRI. The Milk-based formula provided Egyptian infants (7-12 months) with only 30% and young children (12-23 months) with 40% from their daily iron requirement. Although the purpose of iron fortification was to assist infants and young children in increasing their iron intakes to help reduce iron-deficiency anaemia, the current level of fortification will not ensure that all infants and young children achieve recommended intakes of iron.
Frequent Transient Hepatitis C viremia without Seroconversion among Healthcare Workers in Cairo, Egypt
Aline Munier, Diaa Marzouk, Florence Abravanel, Mai El-Daly, Sylvia Taylor, Rasha Mamdouh, Waleed Salah Eldin, Hanan Ezz El-Arab, Dalia Gaber Sos, Mohamed Momen, Omar Okasha, Lenaig Le Fouler, Mostafa El-Hosini, Jacques Izopet, Mona Rafik, Matthew Albert, Mohamed Abdel-Hamid, Mostafa Kamal Mohamed, Elisabeth Delarocque-Astagneau, Arnaud Fontanet
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0057835
Abstract: Backgrounds With 10% of the general population aged 15–59 years chronically infected with hepatitis C virus (HCV), Egypt is the country with the highest HCV prevalence worldwide. Healthcare workers (HCWs) are therefore at particularly high risk of HCV infection. Our aim was to study HCV infection risk after occupational blood exposure among HCWs in Cairo. Methodology/Principal Findings The study was conducted in 2008–2010 at Ain Shams University Hospital, Cairo. HCWs reporting an occupational blood exposure at screening, having neither anti-HCV antibodies (anti-HCV) nor HCV RNA, and exposed to a HCV RNA positive patient, were enrolled in a 6-month prospective cohort with follow-up visits at weeks 2, 4, 8, 12 and 24. During follow-up, anti-HCV, HCV RNA and ALT were tested. Among 597 HCWs who reported a blood exposure, anti-HCV prevalence at screening was 7.2%, not different from that of the general population of Cairo after age-standardization (11.6% and 10.4% respectively, p = 0.62). The proportion of HCV viremia among index patients was 37%. Of 73 HCWs exposed to HCV RNA from index patients, nine (12.3%; 95%CI, 5.8–22.1%) presented transient viremia, the majority of which occurred within the first two weeks after exposure. None of the workers presented seroconversion or elevation of ALT. Conclusions/Significance HCWs of a general University hospital in Cairo were exposed to a highly viremic patient population. They experienced frequent occupational blood exposures, particularly in early stages of training. These exposures resulted in transient viremic episodes without established infection. These findings call for further investigation of potential immune protection against HCV persistence in this high risk group.
Antistreptolysin O titer in health and disease: levels and significance
Alyaa Amal Kotby,Nevin Mamdouh Habeeb,Sahar Ezz El Arab
Pediatric Reports , 2012, DOI: 10.4081/pr.2012.e8
Abstract: Over diagnosis of acute rheumatic fever (ARF) based on a raised antistreptolysin O titer (ASOT) is not uncommon in endemic areas. In this study, 660 children (aged 9.2 ±1.7 years) were recruited consecutively and classified as: G1 (control group, n=200 healthy children), G2 (n=20 with ARF 1st attack), G3 (n=40 with recurrent ARF), G4 (n=100 with rheumatic heart disease (RHD) on long acting penicillin (LAP)), G5 (n=100 with acute follicular tonsillitis), and G6 (n=200 healthy children with history of repeated follicular tonsillitis more than three times a year). Serum ASOT was measured by latex agglutination. Upper limit of normal (ULN) ASOT (80th percentile) was 400 IU in G1, 200 IU in G4, and 1600 IU in G6. Significantly high levels were seen in ARF 1st attack when compared to groups 1 and 5 (P<0.001 and P<0.05, respectively). ASOT was significantly high in children over ten years of age, during winter and in those with acute rheumatic carditis. ASOT showed significant direct correlation with the number of attacks of tonsillitis (P<0.05). Egyptian children have high ULN ASOT reaching 400 IU. This has to be taken into consideration when interpreting its values in suspected ARF. A rise in ASOT is less prominent in recurrent ARF compared to 1st attack, and acute and recurrent tonsillitis. Basal levels of ASOT increase with age but the pattern of increase during infection is not age dependent
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