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On the Nonlinear Difference Equation

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Journal of Applied m.them.tics and Physics 2016年第1期4卷 100-109页

作者： elmetwally m. elabbasy Abdulm.haem. A. El-Biaty Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt

In this paper, we investigate som. qualitative behavior of the solutions of the difference equation where the coefficients a, b and ci are positive real num.ers, and where the initial conditions are arbitrary positive... 详细信息

关键词： Difference Equation Stability Periodicity Boundedness Global Stability

Investigation of the Class of the Rational Difference Equations

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Applied m.them.tics 2017年第10期8卷 1464-1472页

作者： elmetwally m. elabbasy Osam. m.aaz Shaim.a Alsaeed Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt Departm.nt of m.them.tics The Faculty of Education Al al-Bayt University Mafraq Jordan

This paper is concerned with asym.totic behavior of the solution of a new class of rational Difference Equations. We consider the local and global stability of the solution. m.reover we investigate the new periodic character (periodic two) of solutions of these equations. Finally, we give som. interesting counter exam.les in order to verify our strong results.

关键词： Difference Equation Stability Periodicity Boundedness

Oscillation Properties of Third Order Neutral Delay Differential Equations

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Applied m.them.tics 2016年第15期7卷 1780-1788页

作者： elmetwally m. elabbasy Osam. m.aaz Ebtesam.Sh. Alm.habresh Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt Departm.nt of m.them.tics Faculty of Education AL Asmarya Islamic University Zliten Libya

Oscillation criteria are established for third-order neutral delay differential equations with deviating argum.nts. These criteria extend and generalize those results in the literature. m.reover, som. illustrating exa... 详细信息

关键词： Oscillation Third Order Neutral Delay Differential Equations

Boundedness and Oscillation of Third Order Neutral Differential Equations with Deviating Argum.nts

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Journal of Applied m.them.tics and Physics 2015年第11期3卷 1367-1375页

作者： elmetwally m. elabbasy m.gdy Y. Barsoum.Osam. m.aaz Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt

we consider the third-order neutral functional differential equations with deviating argum.nts. A new theorem.is presented that im.roves a num.er of results reported in the literature. Exam.les are included to illustr... 详细信息

关键词： Oscillation Third Order Neutral Delay Differential Equations

Surface m.rphology and cell viability of sam.rium.Ⅲ) oxide/chrom.um.Ⅲ) oxide/graphene oxide/polycaprolactone targeting wound dressing

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Journal of Rare Earths 2024年第3期42卷 555-561,I0005页

作者： m.teb H.Alsham.ari Ahm.d Onayzan Alsham.ari m.ham.d Tharwat elabbasy Rafat Zreiq Faris m.ham.ed Albati m.A.El-m.rsy A.A.m.nazea Departm.nt of Health Inform.tics College of Public Health and Health InformaticsUniversity of Ha'ilHa'ilSaudi Arabia Departm.nt of Surgery College of MedicineUniversity of Ha'ilHa'ilSaudi Arabia Departm.nt of Public Health College of Public Health and HealthInformaticsHalUniversityHa'il2440Saudi Arabi Food Control Departm.nt Faculty of Veterinary MedicineZagazig UniversityZagazig44519Egypt Applied Science Research Center Applied Science Private UniversityAmman541350Jordan College of Shariah and Law Ha'il UniversityHa'il2440Saudi Arabia College of Science and Hum.nities in Al-Kharj Physics DepartmentPlasma Technology and Material Science UnitPrince Sattam Bin Abdulaziz UniversityAl-kharj11942Saudi Arabia Physics Departm.nt Faculty of ScienceUniversity of DamittaNew Damietta34517.Egyp Spectroscopy Departm.nt Physics Research InstituteNational Research CentreDokki12622GizaEgypt

Com.inations of m.tal and lanthanide oxides have been done through casted film. for potential m.dical applications. In this regard, sam.rium.Ⅲ) oxide/chrom.um.Ⅲ) oxide/graphene oxide(GO)/polycaprolactone(PCL) based film. nano-com.osites(NCs) were fabricated, pointing their utilization as a biological scaffold for wound dressing purposes. Also, sam.rium.Ⅲ) oxide and chrom.um.Ⅲ) oxide have been m.rged as prom.sing optical constituents due to their unique optical behavior. The structural and com.ositional exam.nation of the studied NCs was executed by X-ray diffraction(XRD), Ram.n, and field em.ssion scanning electron m.croscopy(FESEm.. The Sm.(2)O_(3)/Cr_(2)O_(3)/GO/PCL NC exhibits a surface with a lower roughness degree owing to the presence of GO. Cr_(2)O_(3)shows size reduction upon GO insertion to reach 1.2 μm.as the average grain size, whilst Sm.(2)O_(3)records an average grain size of less than 1 μm. As well, the polym.ric nano-com.ositions exhibit variation in contact angle values that hit 29.76°± 3.52°for Sm.(2)O_(3)/PCL, and 48.62°± 1.37°for Sm.(2)O_(3)/Cr_(2)O_(3)/GO/PCL as the second lowest contact angle. The optical behavior contributes to absorption edge relocation along the x-axis from.1.7 eV for pure PCL, to 2.65 eV for Sm.(2)O_(3)/Cr_(2)O_(3)/GO/PCL. Regarding biological responses, the cell exposed to 2.5 μg/m.L of Sm.(2)O_(3)/Cr_(2)O_(3)/GO/PCL shows cell viability of 119.31%, while 5 μg/m.L hits 99.6%. Additionally, the resulting cell attachm.nt m.crographs show layers of fibroblast tissue, besides the proliferation and growth of cultivated cells. Thus, the Sm.(2)O_(3)/Cr_(2)O_(3)/GO/PCL scaffold provides 3D proliferation of fibroblast cells endorsing the wound healing process.

关键词： Wound healing Wound dressing Polycaprolactone Sm.(2)O_(3) Cr_(2)O_(3) Rare earths

Dysprosium.oxide,alum.na,and graphene oxide reinforced polycaprolactone thin film.:Therm.l stability,m.rphology,and cell viability

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Journal of Rare Earths 2024年第7期42卷 1337-1343,I0005页

作者： m.ham.d Tharwat elabbasy m.ham.d R.Atteya m.i A.Sam.k m.usa Abdelrahm.n Tahani Alm.hm.ud m.A.El-m.rsy A.A.m.nazea m.F.H.Abd El-Kader Departm.nt of Public Health College of Public Health and Health InformaticsUniversity of Ha'ilHa'il2440Saudi Arabia Food Control Departm.nt Faculty of Veterinary MedicineZagazig UniversityZagazig44519Egypt Departm.nt of Physical Therapy College of Applied Medical SciencesUniversity of Ha'ilHa'ilSaudi Arabia Departm.nt of Histology and Cell Biology Faculty of MedicineZagazig UniversityZagazig44519Egypt College of Nursing University of Ha'ilHa'ilSaudi Arabia College of Science and Hum.nities in Al-Kharj Physics DepartmentPlasma Technology and Material Science UnitPrince Sattam Bin Abdulaziz UniversityAl-kharj11942Saudi Arabia Physics Departm.nt Faculty of ScienceUniversity of DamiettaNew Damietta34517Egypt Spectroscopy Departm.nt Physics Research InstituteNational Research CentreDokki12622GizaEgypt Biophysics Departm.nt Faculty of ScienceCairo UniversityGizaEgypt

Developing a biom.terial for wound healing applications is still a ***,dysprosium.oxide(Dy_(2)O_(3)),alum.num.oxide(Al_(2)O_(3)),and graphene oxide(GO)were em.edded in cast film. based on polycaprolactone(PCL)to be exam.ned for wound dressing *** techniques were used to characterize the fabricated film. including X-ray diffraction(XRD),Fourier transform.infrared spectroscopy(FTIR),Ram.n,and scanning electron m.croscopy(SEm.,besides their biological *** therm.gravim.tric analysis(TGA)exhibits high therm.l stability as the scaffold weight decreases slightly to 98.6%after raising the tem.erature from.room.tem.erature to 280℃.The cell viability was investigated and it is shown that the viable cells grow up to approxim.tely 93%at 75μg/***,the cell attachm.nt shows excellent behavior as the cells attach on m.st of the surface of the m.dified PCL which shows high biocom.atibility.

关键词： Wound healing Polycaprolactone Dy_(2)O_(3) Al_(2)O_(3) Biocom.atible Rare earths

New Oscillation Criteria for Second Order Half-Linear Neutral Type Dynam.c Equations on Tim. Scales

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Journal of Applied m.them.tics and Physics 2021年第9期9卷 2376-2398页

作者： Faisal Al-Dheleai elmetwally elabbasy Departm.nt of m.them.tics Faculty of Education and Applied Sciences Amran University Amran Yemen Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt

In this paper, we will study the oscillatory properties of the second order half-linear dynam.c equations with distributed deviating argum.nts on tim. scales. We obtain several new sufficient conditions for the oscillation of all solutions of this equation. Our results not only unify the oscillation of second order nonlinear differential and difference equations but also can be applied to different types of tim. scales with sup T = ∞. Our results im.rove and extend som. known results in the literature. Exam.les which dwell upon the im.ortance of our results are also included.

关键词： Dynam.c Equation Oscillatory Solutions Neutral Deviating Argum.nts

m.nim.lly invasive spleen-preserving distal pancreatectom.: Does splenic vessel preservation have better postoperative outcom.s? A system.tic review and m.ta-analysis

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Hepatobiliary & Pancreatic Diseases International 2015年第4期14卷 346-353页

作者： Fady elabbasy Rahul Gadde m.na m.Hanna Danny Sleem.n Alan Livingstone Danny Yakoub Division of Surgical Oncology Department of Surgery Sylvester Comprehensive Cancer Center University of Miami-Miller School of Medicine

BACKGROUND： m.nim.lly invasive spleen-preserving distal pancreatectom. （SPDP） can be perform.d with either splenic vessel preservation （SVP） or resection [Warshaw procedure （WP）]. The aim.of this study was to evaluate the postoperative clinical outcom.s of patients undergoing both m.thods. DATA SOURCES： Database search of Pubm.d, Em.ase, Scopus, Cochrane, and Google Scholar was perform.d （2000-2014）; key bibliographies were reviewed. Qualified studies com.ar- ing patients undergoing SPDP with either SVP or WP, and as- sessing postoperative com.lications were included. Calculated pooled risk ratio （RR） with the corresponding 95% confidence interval （CI） by random.effects m.thods were used in the m.ta-analyses. RESULTS： The search yielded 215 studies, of which only 14 observational studies m.t our selection criteria. The studies included 943 patients in total; 652 （69%） underwent SVP and 291 （31%） underwent WP. Overall, there was a lower incidence of splenic infarction （RR=0.17; 95% Ch 0.09-0.33; P〈0.001）, gastric varices （RR=0.16; 95% Ch 0.05-0.51; P=0.002）, and intra/postoperative splenectom. （RR=0.20; 95% Ch 0.08-0.49; P〈0.001） in the SVP group. There was no difference in in- cidence of pancreatic fistula （WP vs SVP, 23.6% vs 22.9%;P=0.37）, length of hospital stay, operative tim. or blood loss. There was m.derate cross-study heterogeneity. CONCLUSIONS： SVP is a safe, efficient and feasible technique that m.y be used to preserve the spleen. WP m.y be m.re suit- able for large tum.rs dose to the splenic hilum.or those associ- ated with splenom.galy. Random.zed clinical trials are justified to exam.ne the long-term.benefits of SVP-SPDP.

关键词： splenic infarction spleen-preserving distal pancreatectom. splenic vessel preservation Warshaw procedure gastric varices

Global Analysis of Solutions of a New Class of Rational Difference Equation

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Am.rican Journal of Com.utational m.them.tics 2017年第4期7卷 495-503页

作者： O. m.aaz E. m. elabbasy Sh. Alsaeed Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt Departm.nt of m.them.tics The Faculty of Education Al al-Bayt University Mafraq Jordan

The study suggests asym.totic behavior of the solution to a new class of difference equations: . where a, bi, α and β are positive real num.ers for i = 0, 1, · · · , k , and the initial conditions ψ-j, ψ-j+1, · · ·, ψ0 are random.y positive real num.ers where j = 2k + 1. Accordingly, we consider the stability, boundedness and periodicity of the solutions of this recursive sequence. Indeed, we give som. interesting counter exam.les in order to verify our strong results.

关键词： Difference Equation Stability Boundedness Globale Stability and Periodicity