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Behavior of raft on settlement reducing piles:Experimental model study

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Behavior of raft on settlement reducing piles:Experimental m...

Nanoscale electropolishing of high-purity nickel with an ionic liquid

第13届全国岩石动力学学术会议

作者： Basuony El-Garhy Ahmed abdel Galil abdel-fattah youssef Mohamed Abo Raia Civil Engineering Department Faculty of EngineeringMinufiya UniversityShebin El-KomEgypt

An experimental program is conducted on model piled rafts in sand *** experimental program is aimed to investigate the behavior of raft on settlement reducing *** testing program includes tests on models of single pile,unpiled rafts and rafts on 1,4,9,or 16 *** model piles beneath the rafts are closed ended displacement piles installed by *** lengths of piles are used in the experiments to represent slenderness ratio,L/D,of 20,30 and 50,*** dimensions of the model rafts are 30 cm x 30cm with different thickness of 0.5 cm,1.0 cm or 1.5 *** raft-soil stiffness ratios of the model rafts ranging from 0.39 to 10.56 cover flexible to very stiff *** improvement in the ultimate bearing capacity is represented by the load improvement ratio,LIR,and the reductions in average settlement and differential settlement are represented by the settlement ratio,SR,and the differential settlement ratio,DSR,*** effects of the number of settlement reducing piles,raft relative stiffness,and the slenderness ratio of piles on the load improvement ratio,settlement ratio and differential settlement ratio are presented and *** results of the tests show the effectiveness of using piles as settlement reduction measure with the *** the number of settlement reducing piles increases,the load improvement ratio increases and the differential settlement ratio decreases.

关键词： Raft Settlement reducing piles Piled raft Model tests Sand soil

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International Journal of Minerals,Metallurgy and Materials 2019年第5期26卷 649-656页

作者： Jon Derek Loftis Tarek M.abdel-fattah Applied Research Center at Thomas Jefferson National Accelerator Facility and Department of Molecular Biology and Chemistry at Christopher Newport University Department of Physical Sciences Virginia Institute of Marine Science College of William and Mary Faculty of Sciences Alexandria University

High purity(>99.9% composition) nickel metal specimens were used in electropolishing treatments with an acid-free ionic liquid electrolyte prepared from quaternary ammonium salts as a green polishing solution. Voltammetry and chronoamperometry tests were conducted to determine the optimum conditions for electrochemical polishing. Atomic force microscopy(AFM) revealed nanoscale effectiveness of each polishing treatment. Atomic force microscopy provided an overall observation of the material interface between the treated and unpolished regions. Surface morphology comparisons summarized electrochemical polishing efficiency by providing root-mean-square roughness averages before and after electrochemical polishing to reveal a mirror finish six times smoother than the same nickel metal surface prior to electropolishing. This transition manifested in a marked change in root-mean-squared roughness from 112.58 nm to 18.64 nm and producing a smooth mirror finish. Finally, the mechanism of the ionic liquid during electropolishing revealed decomposition of choline in the form of a transient choline radical by acceptance of an electron from the nickel-working electrode to decompose to trimethylamine and ethanol.

关键词： electrochemical polishing ionic liquid Ni 2EG:1VB4

Antifouling evaluation of extracts from Red Sea soft corals against primary biofilm and biofouling

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Asian Pacific Journal of Tropical Biomedicine 2017年第11期7卷 991-997页

作者： Yosry abdel Aziz Soliman Ahmed Mohammed Brahim Ahmed Hussein Moustafa Mohamed abdel fattah Hamed Marine Chemistry Lab. Marine Environment DivisionNational Institute of Oceanography and FisheriesSuezEgypt Department of Chemistry Faculty of ScienceZagazig UniversityZagazigEgypt

Objectives: To evaluate antifouling property of extracts from Red Sea soft corals against primary biofilm and ***: Seven species of soft corals Sarcophyton glaucum(a), Sinularia compressa,Sinularia cruciata(a), Heteroxenia fuscescens(a), Sarcophyton glaucum(b), Heteroxenia fuscescens(b) and Sinularia cruciata(b) were chosen to test their extracts as antibacterial and antifouling agents in Eastern Harbour of Alexandria, Mediterranean *** compounds of soft corals were extracted by using methanol and concentrated under vacuum. The residues of extracts were mixed in formulation of inert paint which consisted of rosin, chlorinated rubber and ferrous oxide against micro and macro fouling organisms. The formulated paints were then applied on PVC panels twice by brush,hanged in a steel frame and immersed in Eastern Harbour of Alexandria Mediterranean Sea followed by visual inspection and photographic ***: After 185 days of immersion in seawater, the antifouling results agreed with the antibacterial results where extracts of Sinularia compressa and Heteroxenia fuscescens(b) gave the best activity against marine fouling tubeworms and barnacles. The inhibition activity was correlated with the major functional groups(hydroxyl, amino, carbonyl,aliphatic(fatty acids), C]C of alkene or aromatic rings and CeC l of aryl halides) of the ***: The strong antifouling activity makes them promising candidates for new antifouling additives. After the screening and application of natural organic compounds from soft corals, marine organisms show activity against micro and macro fouling organisms.

关键词： Antibacterial Antifouling Paints Seawater Marine Organisms

Spectrofluorimetric and Spectrophotometric Stability- Iwndicating Methods for the Analysis of Veralipride in Presence of Its Degradants and in Spiked Human Plasma

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Chinese Journal of Chemistry 2012年第1期30卷 183-189页

作者： Salama,Nahla Nour El Din Ahmed Salem,Maissa Yacoub Abd El Halim,Lobna Mohammed abdel fattah,Laila EI-Sayed National Organization for Drug Control and Research(NODCAR) 6 Abu Hazem StreetPyramids AveP.O.Box 29GizaEgypt Analytical Chemistry Department Faculty of PharmacyCairo UniversityCairoEgypt Analytical Chemistry Department Faculty of PharmacyMisr University for Science and Technology6th of OctoberEgypt

Spectrofluorimetric and spectrophotometric stability-indicating methods were developed and validated for analysis of veralipride （Ver） in presence of its hydrolytic and oxidative degradants. The spectrofluorimetric method was based on direct measurement of the intrinsic fluorescence of Ver at 366 nm after excitation at 299 nm using sodium lauryl sulfate （SLS） as micelle enhancer. The fluorescence intensity plot was linear over the concentration range 1.0-10.0 ***-1. The high sensitivity of the method allowed its successful application to the analysis of Ver in spiked human plasma. Two other methods were developed. They are based on the oxidative coupling reac- tion of Vet with 3-methyl benzothiazolin-2-one hydrazone （MBTH） hydrochloride in presence of ceric ammonium sulphate in an acidic medium. The first method depends on spectrophotometric measurement of the stable green colored oxidative coupling product at 660 nm. The different experimental parameters affecting the reaction were optimized. Linearity range is 10.0--100.0 ~tgomL-1. The second method depends on a fluorescence quenching effect of Vet on the fluorescence of Ce3＋. The difference in fluorescence intensity was measured at 380 nm after excitation at 300 nm. This method is applicable over the concentration ranges 0.25-2.50 pg-mL-1. The methods were validated according to the ICH guidelines. They were successfully applied for the analysis of Ver in drug substance, drug product and in laboratory prepared mixtures containing different percentages of hydrolytic and oxidative degradants.

关键词： veralipride micelle-enhanced fluorescence MBTH validation stability fluorescence quenching Ce3+

Novel non-invasive biological predictive index for liver fibrosis in hepatitis C virus genotype 4 patients

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World Journal of Hepatology 2016年第32期8卷 1392-1401页

作者： Mahmoud Khattab Mohamed Amin Sakr Mohamed abdel fattah youssef Mousa Elwy Soliman Ashraf Breedy Mona Fathi Salwa Gaber Ahmed Altaweil Ashraf Osman Ahmed Hassouna Ibrahim Motawea Department of Internal Medicine Minia University Department of Tropical Medicine Ain Shams University Department of Clinical Pathology Ain Shams University Department of Pathology Minia University Department of Pathology Ain Shams University Department of Clinical Pathology Minia University Department of Cardiothoracic Surgery Ain Shams University

AIMTo investigate the diagnostic ability of a non-invasive biological marker to predict liver fibrosis in hepatitis C genotype 4 patients with high accuracy. METHODSA cohort of 332 patients infected with hepatitis C genotype 4 was included in this cross-sectional study. Fasting plasma glucose, insulin, C-peptide, and angiotensin-converting enzyme serum levels were measured. Insulin resistance was mathematically calculated using the homeostasis model of insulin resistance (HOMA-IR). RESULTSFibrosis stages were distributed based on Metavir score as follows: F0 = 43, F1 = 136, F2 = 64, F3 = 45 and F4 = 44. Statistical analysis relied upon reclassification of fibrosis stages into mild fibrosis (F0-F) = 179, moderate fibrosis (F2) = 64, and advanced fibrosis (F3-F4) = 89. Univariate analysis indicated that age, log aspartate amino transaminase, log HOMA-IR and log platelet count were independent predictors of liver fibrosis stage (P CONCLUSIONOur predictive model is easily available and reproducible, and predicted liver fibrosis with acceptable accuracy.

关键词： Liver fibrosis Insulin resistance Aspartate amino transaminase Platelets Age

Oil-source correlation and Paleozoic source rock analysis in the Siwa Basin,Western Desert:Insights from well-logs,Rock-Eval pyrolysis,and biomarker data

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Energy Geoscience 2024年第3期5卷 313-327页

作者： Mohamed I.abdel-fattah Mohamed Reda Mohamed Fathy Diaa A.Saadawi Fahad Alshehri Mohamed S.Ahmed Petroleum Geosciences and Remote Sensing Program Department of Applied Physics and AstronomyCollege of SciencesUniversity of SharjahSharjah27272United Arab Emirates Geology Department Faculty of ScienceSuez Canal UniversityIsmailiaEgypt Faculty of Science Geology DepartmentAl-Azhar UniversityP.O.Box 11884Nasr CityCairoEgypt Abdullah Alrushaid Chair for Earth Science Remote Sensing Research Geology and Geophysics DepartmentCollege of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Understanding the origins of potential source rocks and unraveling the intricate connections between reservoir oils and their source formations in the Siwa Basin(Western Desert,Egypt)necessitate a thorough oil-source correlation *** objective is achieved through a meticulous analysis of well-log responses,Rock-Eval pyrolysis,and biomarker *** analysis of Total Organic Carbon across 31 samples representing Paleozoic formations in the Siwa A-1X well reveals a spectrum of organic richness ranging from 0.17 wt%to 2.04 wt%,thereby highlighting diverse levels of organic content and the presence of both Type II and Type III *** of the fingerprint characteristics of eight samples from the well suggests that the Dhiffah Formation comprises a blend of terrestrial and marine organic ***,a significant contribution from more oxidized residual organic matter and gas-prone Type III kerogen is ***,the Desouky and Zeitoun formations exhibit mixed organic matter indicative of a transitional environment,and thus featuring a pronounced marine influence within a more reducing setting,which is associated with Type II *** analysis of five oil samples from different wells—SIWA L-1X,SIWA R-3X,SIWA D-1X,PTAH 5X,and PTAH 6X,it is evident that terrestrial organic matter,augmented by considerable marine input,was deposited in an oxidizing environment,and contains Type III *** scrutiny confirms the coexistence of mixed terrestrial organic matter within varying redox *** is the uniformity of identified kerogen Types II and III across all samples,known to have potential for hydrocarbon *** discovery presented in this paper unveils captivating prospects concerning the genesis of oil in the Jurassic Safa reservoir,suggesting potential links to Paleozoic sources or even originating from the Safa Member *** revelations mark a substantial advancement in understanding source

关键词： Biomarker data Oil-source correlation Rock-Eval pyrolysis Source rocks Siwa Basin

Stellar Population Analysis of Galaxies based on Genetic Algorithms

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Chinese Journal of Astronomy and Astrophysics 2005年第4期5卷 347-355页

作者： abdel-fattah Attia H.A.Ismail I.M.Selim A.M.Osman I.A.Isaa M.A.Marie A.A.Shaker National Research Institute of Astronomy and Geophysics(NRIAG) 11421 HelwanCairoEgyptNational Research Institute of Astronomy and Geophysics(NRIAG)11421 HelwanCairoEgypt Cairo University Faculty of ScienceAstronomy DepartmentEgypt

We present a new method for determining the age and relative contribution of different stellar populations in galaxies based on the genetic *** apply this method to the barred spiral galaxy NGC 3384,using CCD images in U,B,V,R and I *** analysis indicates that the galaxy NGC 3384 is mainly inhabited by old stellar population(age〉10^9 yr).Some problems were encountered when numerical simulations are used for determining the contribution of different stellar populations in the integrated color of a *** results show that the proposed genetic algorithm can search efficiently through the very large space of the possible ages.

关键词： methods numerical-galaxies stellar population-galaxies individual(NGC 3384).

Rapid Magnetic 3D Printing of Cellular Structures with MCF-7 Cell Inks

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Research 2019年第1期2019卷 1183-1195页

作者： S.Mishriki A.R.abdel fattah T.Kammann R.P.Sahu F.Geng I.K.Puri School of Biomedical Engineering McMaster UniversityHamiltonOntarioCanada Department of Mechanical Engineering McMaster UniversityHamiltonOntarioCanada Faculty of Biological Sciences Friedrich-Schiller-University JenaGermany

A contactless label-free method using a diamagnetophoretic ink to rapidly print three-dimensional(3D)scafold-free multicellular structures is *** inks consist of MCF-7 cells that are suspended in a culture medium to which a paramagnetic salt,diethylenetriaminepentaacetic acid gadolinium(III)dihydrogen salt hydrate(Gd-DTPA),is *** a magnetic feld is applied,the host fuid containing the paramagnetic salt is attracted towards regions of high magnetic feld gradient,displacing the ink towards regions with a low *** this method,3D structures are printed on ultra-low attachment(ULA)*** a tissue culture treated(TCT)surface,a 3D printed spheroid coexists with a two-dimensional(2D)cell monolayer,where the composite is termed as a 2.5D *** 3D structures can be magnetically printed within 6 hours in a medium containing 25 mM *** infuence of the paramagnetic salt on MCF-7 cell viability,cell morphology,and ability of cells to adhere to each other to stabilize the printed structures on both ULA and TCT surfaces is *** expressions of hypoxia-inducible factor 1-alpha(HIF1�)and vascular endothelial growth factor(VEGF)allow comparison of the relative stresses for the printed 3D and 2.5D cell geometries with those for 3D spheroids formed without magnetic *** magnetic printing method can be potentially scaled to a higher throughput to rapidly print cells into 3D heterogeneous cell structures with variable geometries with repeatable dimensions for applications such as tissue engineering and tumour formation for drug discovery.

关键词： structure culture dimensions

The Effect of Sun Elevation on the Twilight Stages in Malaysia

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International Journal of Astronomy and Astrophysics 2022年第1期12卷 7-29页

作者： Yasser abdel-fattah abdel-Hadi Amir Hussein Hassan Solar and Space Research Department National Research Institute of Astronomy and Geophysics (NRIAG) Helwan Cairo Egypt

This study is concerned with determining the altitude of the sun under the horizon to the beginning and the end of the true and pseudo dawn and dusk. In 2007 and 2008, the Sky Quality Meter (SQM) was used in four regions in Malaysia to measure the brightness at night, pseudo dawn, true dawn, true dusk and pseudo dusk. The measurements were taken when the device was directed to the position of sunrise and sunset at the horizontal angle of the sunrise or sunset and at five degrees above the horizon during the entire monitoring period. The altitude of the sun for the true dusk was found to be -14.38°± 0.91°and for the beginning of the pseudo dusk was found to be -14.86°± 0.91°and the end of the pseudo dusk is -17.8°± 0.7°, while for the beginning of the true dawn it was found to be -14.19°± 0.52°(for high confidence -14.71°) and for the pseudo dawn was found to be -18.62°± 0.82°. The light magnitude of the full night after the pseudo dusk was found to be 20.77 ± 0.93 mag./arcsec2, while it was found to be 22.17 ± 0.1 mag./arcsec2 before the pseudo dawn.

关键词： Twilight Light Magnitude Altitude of the Sun Beginning of the True Dusk Beginning of the True Dawn Pseudo Dusk Pseudo Dawn Full Night SQM