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Behavior of raft on settlement reducing piles:Experimental model study

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第5期5卷 389-399页

作者： Basuony el-Garhy Ahmed abdel Galil abdel-fattah Youssef mohamed Abo Raia Civil Engineering Department Faculty of Engineering Minufiya University

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×30 cm 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

NANOPOROUS MATERIALS BASED ON SPIROKETAL AND SPIROTHIOKETAL POLYMERS FOR SEPARATING METHANOL-TOLUENE MIXTURE

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Chinese Journal of Polymer Science 2011年第4期29卷 450-455页

作者： Hamada Hamada abdel-Razik Zeinhom mohamed el-Bahy Chemistry Department Faculty of Science and Education(Alkhurma Branch)Taif UniversitySaudi Arabia

Organic microporous materials based on spiroketal and spirothioketal polymers were synthesized through 1,3- dioxol-forming polymerization reaction between pentaerythritol or pentaerythritol tetrathiol and different types of cyclohexa- 1,4-dione derivatives. The structure of the prepared polymers was confirmed by NMR spectroscopy and molecular mass measurements. Nitrogen adsorption/desorption isotherms of the prepared polymers show a large amount of nitrogen adsorbed at low relative pressure indicating microporosity. These polymers have Brunauer Emmitt and Teller （BET） surface areas in the range from 492 （m^2g^-1） to 685 （m^2 g^-1）. The prepared polymers were found to be useful for pervaporation separation of methanol-toluene mixture with a separation factor up to 12.5 and fluxes, varying between 6.7×10-3 kg/（m^2 h） and 13.4 × 10^-3 kg/（m^2 h）.

关键词： Spiroketal polymers Nanoporous materials Separation membranes.

Non-Hodgkin Lymphoma of the Liver:A US Population-based Analysis

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Journal of Clinical and Translational Hepatology 2017年第2期5卷 83-91页

作者： mohamed Abd el-fattah Department of Internal Medicine Faculty of Medicine Suez Canal University Ismailia Egypt

Background and Aims:Non-Hodgkin lymphoma (NHL) of the liver is a rare lymphoid malignancy,accounting for less than 1% of extranodal ***:I conducted an analysis of the U.S Surveillance,Epidemiology,and End Results (SEER) database to evaluate the histological subtypes and the survival outcomes of 785 cases with hepatic NHL between 1973 and ***:There were 785 of 312 459 cases with NHL had a first primary hepatic NHL (0.25%).Of the total 785 cases,the median age at diagnosis was 61 years (range 3-95 years) and male-female ratio of 1.7∶*** most common subtype was diffuse large B cell lymphoma (63.2%).In all patients,the median overall survival (OS) was 33 months (95%CI,22-48 months).The 5-year OS rate for indolent B-cell NHLs was 62%,compared with 44% for an aggressive B-cell NHLs and 42% for T-cell *** median OS improved from 19 months in patients diagnosed in a period 1996-2000 to 60 months when diagnosed between 2006 and 2012 (p ell NHLvariants (aHR 1.73,p =.03) were unfavourable prognostic ***:NHL of the liver comprises about 0.3% of all NHLs and survival was improved in the recent calendar period.

关键词： Non-Hodgkin lymphoma Liver Primary hepatic lymphoma Hepatic neoplasms

Dolomite apatite separation by amphoteric collector in presence of bacteria

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Journal of Central South University 2013年第6期20卷 1645-1652页

作者： elmahdy Ahmed el-Mofty Salah abdel-Khalek mohamed abdel-Khalek Nagui el-MidanyAyman Central Metallurgical Research and Development Institute Mining Petroleum and Metallurgical Engineering DepartmentCairo University

Bioflotation represents one of the growing trends to enhance the selectivity of conventional flotation processes. It utilizes the micro-organisms to replace or to interact with the chemical reagents to increase the gap between surface properties of similar minerals and to enhance the separation selectivity. In this work, dolomite-phosphate separation was investigated using amphoteric collector （dodecyl-N-carboxyethyl-N-hyroxyethyl-imidazoline） in presence of bacteria. Two types of bacteria, Corynebacterium- diphtheriae-intermedius （CDI）, and Pseudomonas aeruginosa （PA）, were used. The collector-bacteria interaction was characterized by Fourier transform infra-red （FTIR）, frothing height and Zeta potential. The results show that the collector-bacteria interaction improves the flotation selectivity. Although, the PA positively affects the separation results, the CDI cannot lower the MgO to less than 1%. A phosphate content of 0.7% MgO and 31.77% P205 with a recovery of 68% at pH 11, 3.0 kg/t amphoteric collector, 4× 10^7 cells of PA is obtained.

关键词： dolomite phosphate amphoteric collector bacteria bio-flotation carbonate minerals

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

Martensitic transformation and magnetic properties of aged Ni-Fe-Ga-Ti shape memory alloy

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International Journal of Minerals,Metallurgy and Materials 2013年第9期20卷 867-873页

作者： Nader el-Bagoury Mahmoud mohamed Hessien Magdy abdel Wahab Kaseem Chemistry Department Faculty of Science TAIF University P.O. Box 888 El-Haweyah El-Taif Saudi Arbia Central Metallurgical Research and Development Institute (CMRDI) P.O. Box 87 Helwan Cairo Egypt Head of National Authority for Quality of Education Assurance and Accreditation Nasr City Cairo P.O. Box 11461 Egypt

This article reports the effect of ageing on the microstructure, martensitic transformation, magnetic properties, and mechanical properties of Ni51FelsGa27Ti4 shape memory alloy. There are five specimens of this alloy aged at 573 up to 973 K for 3 h per each. This range of ageing temperature greatly affects the microstructure of the alloy. As the ageing temperature increased from 573 up to 973 K, the microstructure of Ni51FelsGa27Ti4 alloy gradually changed from the entirely martensitic matrix at 573 K to the fully austenitic microstructure at 973 K. The volume fraction of precipi- tated Ni3Ti particles increased with the ageing temperature increasing from 573 to 773 K. Further increasing the ageing temperature to 973 K decreased the content of Ni3Ti in the microstructure. The martensitic transformation tempera- ture was decreased steadily by increasing the ageing temperature. The magnetization saturation, remnant magnetization, and coercivity increased with the ageing temperature increasing up to 773 K. A further increase in ageing temperature decreased these raagnetic properties. Moreover, the hardness values were gradually increased at first by increasing the ageing temperature to 773 K, and then dramatically decreased to the lowest value at 973 K.

关键词： magnetic materials shape memory effect ageing microstructure martensitic transformations magnetic properties hardness

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

Nanoscale electropolishing of high-purity nickel with an ionic liquid

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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

Distribution network reconfiguration using feasibility-preserving evolutionary optimization

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Journal of Modern Power Systems and Clean Energy 2019年第3期7卷 589-598页

作者： Alberto LANDEROS Slawomir KOZIel mohamed Fabdel-fattah School of Science and Engineering Reykjavik University101 ReykjavikIceland Faculty of electronics Telecommunications and InformaticsGdansk University of Technology80-233Gdan′skPoland

Distribution network reconfiguration(DNR) can significantly reduce power losses, improve the voltage profile, and increase the power quality. DNR studies require implementation of power flow analysis and complex optimization procedures capable of handling large combinatorial problems. The size of distribution network influences the type of the optimization method to be applied. Straightforward approaches can be computationally expensive or even prohibitive whereas heuristic or meta-heuristic approaches can yield acceptable results with less computation cost. In this paper, a customized evolutionary algorithm has been introduced and applied to power distribution network reconfiguration. The recombination operators of the algorithm are designed to preserve feasibility of solutions(radial structure of the network) thus considerably reducing the size of the search space. Consequently, improved repeatability of results as well as lower overall computational complexity of the optimization process have been achieved. The optimization process considers power losses and the system voltage profile, both aggregated into a scalar cost function. Power flow analysis is performed with the Open Distribution System Simulator,a simple and efficient simulation tool for electric distribution systems. Our approach is demonstrated using several networks of various sizes. Comprehensive benchmarking indicates superiority of the proposed technique over state-of-the-art methods from the literature.

关键词： Distribution network reconfiguration(DNR) Feasibility-preserving evolutionary optimization Power loss reduction Radial networks Voltage profile