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DERIVATIVE SAmPLING EXPANSIONS FOR ThE LINEAR CANONICAL TRANSFORm:CONVERGENCE AND ERROR ANALYSIS

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Journal of Computational mathematics 2019年第3期37卷 403-418页

作者： mahmoud h.Annaby Rashad m.Asharabi Department of mathematics Faculty of ScienceCairo University12613 GizaEgypt Department of mathematics College of Arts and SciencesNajran UniversitySaudi Arabia

In recent decades,the fractional Fourier transform as well as the linear canonical transform became very efficient tools in a variety of approximation and signal processing *** are many literatures on sampling expansions of interpolation type for bandlimited functions in the sense of these ***,rigorous studies on convergence or error analysis are *** is our aim in this paper to establish sampling expansions of interpolation type for bandlimited functions and to investigate their convergence and error *** particular,we introduce rigorous error estimates for the truncation error and both amplitude and jitter-time errors.

关键词： Linear canonical transform Sampling theorems Truncation error Amplitude error Jitter-time error

SOmE PROPERTIES OF m-ISOmETRIES AND m-INVERTIBLE OPERATORS ON BANACh SPACES

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Acta mathematica Scientia 2012年第2期32卷 520-530页

作者： Ould Ahmed mahmoud Sid Ahmed Department of mathematics College of ScienceAljouf UniversityAljouf 2014Saudi Arabia

This article has two purposes： the first is to give some structure results for the class of m-isometries, and the second purpose is to extend the notions of left and right inverses to m-left and m-right inverses resp... 详细信息

关键词： m-isometry m-left inverse m-right inverse approximate spectrum pointspectrum

Influence of potassium fertilization and foliar application of zinc and phosphorus on growth,yield components,yield and fiber properties of Egyptian cotton(Gossypium barbadense L.)

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Journal of Plant Ecology 2008年第4期1卷 259-270页

作者： Zakaria m.Sawan mahmoud h.mahmoud Amal h.El-Guibali Cotton Research Institute Agricultural Research CenterMinistry of Agriculture and Land Reclamation9 Gamaa StreetGiza 12619Egypt Soils Water and Environment Research InstituteAgricultural Research CenterMinistry of Agriculture and Land Reclamation9 Gamaa StreetGiza 12619Egypt

Aims Supplying optimal quantities of mineral nutrients to growing crop plants is one way to improve crop *** need to be used rationally in order to avoid a negative ecological impact and undesirable effects on the sustainability of agricultural production *** application of nutrients also affects the farmer’s *** order to calculate the amount of fertilizer to be applied to crops,it is necessary to develop recommendation programmers that adjust nutrient rates to crop *** Experiments in two successive seasons were conducted to investigate the effect of K fertilization and foliar application of Zn and P on yield and fiber properties of cotton *** ***(0.0 and 47.4 kg of K ha^(-1))was soil applied,while chelated zinc(0.0 and 57.6 g of Zn ha^(-1),applied twice at 70 and 85 days after sowing‘DAS’)and phosphorus(0.0,576,1152 and 1728 g of P ha^(-1),applied twice at 80 and 95 DAS)were applied to the *** findings Dry matter yield,total chlorophyll concentration,K,Zn and P uptake per plant,number of opened bolls per plant,boll weight,seed index,lint index,seed cotton yield per plant,seed cotton and lint yield ha^(-1) and earliness of harvest increased with the application of K,Zn and *** generally had no significant effect on lint percentage and fiber properties,with exceptions,for micronaire reading and flat bundle strength,and uniformity ratio,where the mean values of these characters were significantly increased over the untreated control by applying K,and for the micronaire reading in the first season,when applying P at 1728 g ha^(-1),and uniformity ratio in the second season,when applying Pat 1152 and 1728 g ha^(-1),where the mean values of these characters were significantly increased over the untreated control by applying *** the conditions of this study,applying K fertilization at 47.4 kg ha^(-1) combined with spraying cotton plants with zinc at 57.6 g ha^(-1) and also with P at

关键词： cotton fiber properties phosphorus potassium yield and yield components zinc

Neurogenesis dynamics in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

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Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： moawiah m.Naffaa Department of Psychology and Neuroscience Duke UniversityDurhamNCUSA Department of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons migrating to the granule cell layer and glomerular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit remodeling triggered by memory and learning processes. however, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. moreover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory information processing. This adaptive process responds to changes in epithelial composition and contributes to the formation of olfactory memories by modulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions remains a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around mitral and tufted cells. This organizational pattern significantly impacts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and memory. Additionally, this organization is further shaped by axon terminals originating from cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these complex and highly interconnected processes have not been comprehensively studied as a whole. Therefore, this manuscript aims to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These mechanisms are thought to support olfactory learning and memory, potentially through increased

关键词： network adaptability neurogenesis neuronal communication olfactory bulb olfactory learning olfactory memory synaptic plasticity

Effect of Colouring Process on Pitting Susceptibility of Austenitic Stainless Steel

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Journal of materials Science & Technology 2008年第3期24卷 400-406页

作者： S.S.mahmoud m.m.Ahmed Chemistry Department University College of Girls for ArtsScience and EducationAin Shams University

Colouring of the austenitic stainless steel alloy （20.45% Cr, 8.57% Ni） was carried out in NaNO3-KNO3 eutectic melt without and with additions of Na2O2, NaCl and their mixtures at different temperatures ranging from 400-600℃, under open-circuit and galvanostatic anodic polarization conditions. The produced colours greatly depend on the thickness of oxide films, which in turn depends on the composition of the molten bath and its temperature. The more attractive, bright, adherent and uniform coloured oxide films can be obtained at 400, 450 and 500℃ in molten nitrate bath containing NaCl and Na2O2 mixtures. The pitting corrosion susceptibility of the coloured oxide films was tested in FeCl3 and NaCl as corrosive media. The obtained results indicate that the pitting corrosion susceptibility of the coloured oxide films greatly depends on the previous operating conditions of the colouring process of the stainless steel specimens such as the composition of molten bath, temperature and technique of colouring process.

关键词： Stainless steel alloy Pitting corrosion Colouring processes

ON ThE COEFFICIENTS OF DIFFERENTIATED EXPANSIONS AND DERIVATIVES OF ChEBYShEV POLYNOmIALS OF ThE ThIRD AND FOURTh KINDS

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Acta mathematica Scientia 2015年第2期35卷 326-338页

作者： Eid h.DOhA Waleed m.ABD-ELhAmEED mahmoud A.BASSUONY Department of mathematics Faculty of ScienceCairo University Department of mathematics Faculty of ScienceUniversity of Jeddah Department of mathematics Faculty of ScienceFayoum University

Two new analytical formulae expressing explicitly the derivatives of Chebyshev polynomials of the third and fourth kinds of any degree and of any order in terms of Chebyshev polynomials of the third and fourth kinds themselves are proved. Two other explicit formulae which express the third and fourth kinds Chebyshev expansion coefficients of a general-order derivative of an infinitely differentiable function in terms of their original expansion coefficients are also given. Two new reduction formulae for summing some terminating hypergeometric functions of unit argument are deduced. As an application of how to use Chebyshev polynomials of the third and fourth kinds for solving high-order boundary value problems, two spectral Galerkin numerical solutions of a special linear twelfth-order boundary value problem are given.

关键词： Chebyshev polynomials of the third and fourth kinds expansion coefficients generalized hypergeometric functions boundary value problems

α-FUZZY PAIRWISE RETRACT OF L-VALUED PAIRWISE STRATIFICATION SPACES

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Chinese Annals of mathematics,Series B 2004年第4期25卷 533-544页

作者： m.h.GhANIm F.S.mahmoud m.A.FATh ALLA m.A.hEBEShI Department of mathematics Faculty of ScienceZagazig UniversityZagazigEgypt.Department of MathematicsFaculty of ScienceSohagEgypt.Department of MathematicsFaculty of ScienceSohagEgypt.Department of MathematicsFaculty of ScienceSohagEgypt.

The notion of a fuzzy retract was introduced by Rodabaugh (1981). The notion of a fuzzy pairwise retract was introduced in 2001. Some weak forms and some strong forms of α-continuous mappings were introduced in 1988 and 1997. The authors extend some of these forms to the L-fuzzy bitopological setting and construct various α-fuzzy pairwise retracts. The concept of weakly induced spaces in the case L = [0,1] was introduced by martin (1980). Liu and Luo (1987) generalized this notion to the case that L is an arbitrary F-lattice and introduced the notion of induced L-fts. Several results are obtained, especially, for L-valued pairwise stratification spaces.

关键词： L-fuzzy pairwise continuous mappings α-Pairwise continuous mappings α-Fuzzy pairwise retracts L-valued pairwise stratification spaces

Search for production of dark fermion candidates in association with heavy neutral gauge boson decaying to dimuon in proton-proton collisions at√s=8 TeV using CmS open data

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Chinese Physics C 2024年第4期48卷 6-13页

作者： Y.mahmoud h.Abdallah m.T.hussein S.Elgammal Centre for theoretical physics The British University in EgyptEgypt Physics Department Faculty of ScienceCairo UniversityEgypt

In this study,we conducted a search for dark matter using a part of the data recorded by the CmS experiment during run-I of the LhC in 2012 with a center of mass energy of 8 TeV and an integrated luminosity of 11.6 fb−*** data were gathered from the CmS open *** matter,in the framework of the simplified model(mono-Z′),can be produced from proton-proton collisions in association with a new hypothetical gauge boson,Z′.Thus,the search was conducted in the dimuon plus large missing transverse momentum *** benchmark scenario of mono-Z′,which is known as light vector,was used for interpreting the CmS open *** evidence of dark matter was observed,and exclusion limits were set on the masses of dark matter and Z′at 95%confidence level.

关键词： dark matter large hadron collider CmS open data search for new physics dark fermion

mitochondria–cGAS–STING axis is a potential therapeutic target for senescence-dependent inflammaging-associated neurodegeneration

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Neural Regeneration Research 2025年第3期20卷 805-807页

作者： Josém.Izquierdo Centro de Biología molecular Severo Ochoa(CBm) Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid(CSIC-UAM)MadridSpain

The word “senescence” comes from the Latin senescens, meaning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from stress-induced cell cycle arrest of pre... 详细信息

关键词： Latin potential lasting