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Direct Spatially Resolved Snapshot Interferometric Phase and Stokes Vector Extraction by Using an Imaging PolarCam

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Chinese Physics Letters 2020年第7期37卷 19-23页

作者： Dahi ibrahim Daesuk Kim Division of Mechanical System Engineering Chonbuk National UniversityJeonju 54896Korea Engineering and Surface Metrology Lab National Institute of StandardsTersa St.El haramEl GizaEgypt

We extract the 3 D phase△and the Stokes parameter S3 of a transmissive anisotropic object spatially using an interferometric Polar *** parallel interferograms with a phase shift ofπ/2 between the images are captured in a single snapshot and then reconstructed by the four-bucket algorithm to extract the 3 D phase of the *** S3 is then calculated directly from the obtained 3 D phase△.The extracted results of△and S3 were compared with those extracted from the non-interferometric Polar Cam and the Thorlabs polarimeter,and the results match quite *** merit of using the interferometric Polar Cam is that no mechanical movement mechanisms are included,and hence the△and S3 of the object can be extracted,with high accuracy and within a part of a second(three times faster than non-interferometric Polar Cam and Thorlabs polarimeter methods).Moreover,this method can be applied in the field of the dynamic spectro–interferometric Polar Cam and can be implemented using swept-wavelength approaches.

关键词： hence faster spatially

Laterites-bearing REEs,Wadi Natash,Southeastern Desert,Egypt

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Journal of Rare Earths 2010年第3期28卷 471-476页

作者： Mohamed El-Ahmady ibrahim Nuclear Materials Authority P.O.Box530EL MaadiCairoEgypt

The present paper recorded the occurrence of laterites-bearing REEs in Natash *** laterite deposits occur as horizons(5-15 m in thickness) at the boundary between the Cretaceous sandstones,and Natash *** was recorded in more than twenty six occurrence distributed over an area of about 500 km2 along and around Wadi *** ranges in color from light-grey,dark-grey to *** distribution of laterite deposits is structural *** results of laterites proved the...

关键词： Natash flows laterites clay minerals REEs

SYNTHESIS AND CHARACTERIZATION OF A METHACRYLATE POLYMER WITH SIDE CHAIN KETONE AND ITS DERIVATIVES

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Chinese Journal of Polymer Science 2011年第1期29卷 101-110页

作者： ibrahim Erol Cemal Cifci Department of Chemistry Faculty of Arts and ScienceUniversity of Afyon KocatepeAfyonkarahisarTurkey

A new type of methacrylate monomer, 2-（4-benzoylphenoxy）-2-oxoethyl methylacrylate （BOEMA） was synthesized. The radical homopolymerization of BOEMA was performed at 65℃ in a 1,4-dioxane solution with benzoyl peroxide as an initiator. The oxime and thiosemicarbazone derivatives of poly[2-（4-benzoylphenoxy）-2-oxoethyl methylacrylate] poly（BOEMA） were prepared with hydroxylamine hydrochloride, and thiosemicarbazone hydrochloride, respectively. The monomer and its homopolymer were characterized with Fourier transform infrared and NMR techniques. The thermal stabilities of poly（BOEMA） and its derivatives were investigated with thermogravimetric analysis and differential scanning calorimetry. The ultraviolet stability of the polymers was compared. The antibacterial and antifungal effects of the monomer and the polymer and its derivatives were also investigated on various bacteria and fungi. The activation energies of the thermal degradation of the polymers were calculated with the Ozawa and Kissinger methods.

关键词： Acetyl group Ethylene dimethacrylate Oxime Thermal stability Biological activity Activation energies

A comparison between powders and thin films of single-walled carbon nanotubes for the adsorption behaviors of phenylalanine and glycine by XANES study

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Science China(Physics,Mechanics & Astronomy) 2010年第8期53卷 1449-1452页

作者： ibrahim Kurash Institute of High Energy Physics Chinese Academy of Sciences

We have compared the adsorption behaviors between single-walled carbon nanotube (SWCNT) powders and thin films with amino acids such as phenylalanine and glycine by using the X-ray absorption near edge structure (XANES) spectroscopy. On SWCNT powders very weak adsorption occurs as confirmed also by studies at high solution concentrations. The comparison of the adsorption behaviors with previous reports for thin films of SWCNTs shows that, due to their compact structure, thin films favor the adsorption of amino acids and represent themselves good candidate for a reliable evaluation of the interaction among amino acids and SWCNTs.

关键词： carbon nanotubes XANES amino acids

Wear properties of copper and copper composites powders consolidated by high-pressure torsion

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Friction 2020年第2期8卷 433-450页

作者： Mohamed ibrahim Abd El AAL Mechanical Engineering Department College of EngineeringPrince Sattam Bin Abdulaziz UniversityWadi Addawaser 11991Saudi Arabia Mechanical Design&Production Department Faculty of EngineeringZagazig UniversityZagazig 44519Egypt

The wear characteristics of Cu and Cu-SiC composite microsize powders consolidated by cold compaction combined with sintering or high-pressure torsion(HPT)were *** HPT processed(HPTed)samples with bimodal and trimodal microstructures and fine Cu grains and SiC particle sizes have superior hardness,reasonable ductility level,and high wear *** wear mass loss and coefficient of friction of HPTed samples were remarkably lower than that of cold-compacted and sintered samples as well as that of micro and nano Cu and Cu-SiC composites from previous *** sample fabrication method has an apparent influence on the wear *** wear mechanism was converted from adhesive,delamination,three-body mechanism,grooves(take off the SiC particles),and cracks into abrasive wear after *** can be considered a dominant wear mechanism in all *** worn surface morphology and analysis support the relationship between wear mechanism and characteristics.

关键词： Cu-SiC composite powders high-pressure torsion(HPT) fine and coarse grains wear characteristics worn surface morphology

Tuning the electronic structure of the earth-abundant electrocatalysts for oxygen evolution reaction(OER)to achieve efficient alkaline water splitting-A review

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Journal of Energy Chemistry 2021年第5期30卷 299-342页

作者： Mohammed-ibrahim Jamesh Moussab Harb Department of Physics and Materials Science City University of Hong KongTat Chee AvenueKowloonHong KongChina Applied and Plasma Physics School of Physics(A28)University of SydneySydneyNSW 2006Australia KAUST Catalysis Center(KCC) Physical Sciences and Engineering Division(PSE)King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Tuning the electronic structure of the electrocatalysts for oxygen evolution reaction(OER)is a promising way to achieve efficient alkaline water splitting for clean energy production(H2).At first,this paper introduces the significance of the tuning of electronic structure,where modifying the electronic structure of the electrocatalysts could generate active sites having optimal adsorption energy with OER intermediates,and that could diminish the energy barrier for OER,and that could improve the activity for ***,this paper reviews the tuning of electronic structure along with catalytic performances,synthetic methodologies,chemical properties,and DFT calculations on various nanostructured earth-abundant electrocatalysts for OER in alkaline ***,this review discusses the tuning of the electronic structure of the several nanostructured earth-abundant electrocatalysts including oxide,(oxy)hydroxide,layered double hydroxide,alloy,metal phosphide/phosphate,nitride,sulfide,selenide,carbon containing materials,MOF,core-shell/hetero/hollow structured materials,and materials with vacancies/defects for OER in alkaline environment(including activity:overpotential(η)of ≤200 mV at10 m A cm^(-2);stability:≥100 h;durability:≥5000 cycles).Then,this review discusses the robust stability of the electrocatalysts for OER towards practical ***,this review discusses the in situ formation of thin layer on the catalyst surface during *** addition,this review discusses the influence of the adsorption energy of the OER intermediates on OER performance of the ***,this review summarizes the various promising strategies for tuning the electronic structure of the electrocatalysts to achieve enhanced performance for OER in alkaline environment.

关键词： OER electrocatalyst Electrochemical water splitting Earth abundant electrocatalyst Hydrogen energy

Two-Fold and Symmetric Repeatability Rates for Comparing Keypoint Detectors

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Computers, Materials & Continua 2022年第12期73卷 6495-6511页

作者： ibrahim El rube’ Department of Computer Engineering CCITTaif UniversityTaif21944Saudi Arabia

The repeatability rate is an important measure for evaluating and comparing the performance of keypoint *** repeatability rate measurementswere used in the literature to assess the effectiveness of keypoint *** these repeatability rates are calculated for pairs of images,the general assumption is that the reference image is often known and unchanging compared to other images in the same ***,these rates are asymmetrical as they require calculations in only one *** addition,the image domain in which these computations take place substantially affects their *** presented scatter diagram plots illustrate how these directional repeatability rates vary in relation to the size of the neighboring region in each pair of ***,both directional repeatability rates for the same image pair must be included when comparing different keypoint *** paper,firstly,examines several commonly utilized repeatability rate measures for keypoint detector *** researcher then suggests computing a two-fold repeatability rate to assess keypoint detector performance on similar scene ***,the symmetric mean repeatability rate metric is computed using the given two-fold repeatability ***,these measurements are validated using well-known keypoint detectors on different image groups with various geometric and photometric attributes.

关键词： Repeatability rate keypoint detector symmetric measure geometric transformation scatter diagram

New Improved Ranked Set Sampling Designs with an Application to Real Data

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Computers, Materials & Continua 2021年第5期67卷 1503-1522页

作者： Amer ibrahim Al-Omari ibrahim M.Almanjahie Department of Mathematics Faculty of ScienceAl al-Bayt UniversityMafraqJordan Department of Mathematics College of ScienceKing Khalid UniversityAbha62529Saudi Arabia Statistical Research and Studies Support Unit King Khalid UniversityAbha62529Saudi Arabia

This article proposes two new Ranked Set Sampling(RSS)designs for estimating the population parameters:Simple Z Ranked Set Sampling(SZRSS)and Generalized Z Ranked Set Sampling(GZRSS).These designs provide unbiased estimators for the mean of symmetric *** is shown that for non-uniform symmetric distributions,the estimators of the mean under the suggested designs are more efcient than those obtained by RSS,Simple Random Sampling(SRS),extreme RSS and truncation based RSS ***,the proposed RSS schemes outperform other RSS schemes and provide more efcient estimates than their competitors under imperfect *** suggested mean estimators under perfect and imperfect rankings are more efcient than the linear regression estimator under *** proposed RSS designs are also extended to cover the estimation of the population *** data is used to examine wthe usefulness and efciency of our estimators.

关键词： Ranked set sampling unbiased estimator simple random sampling mean squared error efciency imperfect ranking

Severe acute pancreatitis: Pathogenetic aspects and prognostic factors

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World Journal of Gastroenterology 2008年第5期14卷 675-684页

作者： ibrahim A Al Mofleh Department of Medicine College of Medicine & King Khalid University Hospital King Saud University Riyadh 11461 Saudi Arabia

Approximately 20% of patients with acute pancreatitis develop a severe disease associated with complications and high risk of mortality. The purpose of this study is to review pathogenesis and prognostic factors of severe acute pancreatitis （SAP）. An extensive medline search was undertaken with focusing on pathogenesis, complications and prognostic evaluation of SAP. Cytokines and other inflammatory markers play a major role in the pathogenesis and course of SAP and can be used as prognostic markers in its early phase. Other markers such as simple prognostic scores have been found to be as e^ective as multifactorial scoring systems （MFSS） at 48 h with the advantage of simplicity, efficacy, low cost, accuracy and early prediction of SAP. Recently, several laboratory markers including hematocrit, blood urea nitrogen （BUN）, creatinine, matrix metalloproteinase-9 （MMP-9） and serum amyloid A （SAA） have been used as early predictors of severity within the first 24 h. The last few years have witnessed a tremendous progress in understanding the pathogenesis and predicting the outcome of SAP. In this review we classified the prognostic markers into predictors of severity, pancreatic necrosis （PN）, infected PN （IPN） and mortality.

关键词： Acute pancreatitis Pathogenesis Prediction Severity Necrosis Infected necrosis Mortality