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A Greener Future: Carbon Nanomaterials from Lignocellulose

Journal of Renewable Materials 2025年第1期13卷 21-47页

作者： Hebat-Allah s.Tohamy Mohamed El-sakhawy samir Kamel Cellulose and Paper Department National Research CentreDokkiGiza12622Egypt

Lignocellulosic materials(LCMs),abundant biomass residues,pose signiﬁcant environmental challenges when improperly disposed ***,such as sugarcane bagasse,rice straw,saw dust and agricultural residues,are abun-dant but often burned,contributing to air pollution and greenhouse gas *** review explores the potential of transforming these materials into high-value carbon nanomaterials(CNMs).We explore the potential of transforming these materials into high-value *** employing techniques like carbonization and activa-tion,LCMs can be converted into various CNMs,including carbon nanotubes(CNTs),graphene(G),graphene oxide(GO),carbon quantum dots(CQDs),nanodiamonds(NDs),fullerenes(F),carbon nanoﬁbers(CNFs),and *** different carbon allotropes further enhances their *** derived from cellulose,lignin,and hemicellulose exhibit promising applications in diverseﬁ*** instance,CNTs can be used in energy storage devices like batteries and supercapacitors due to their exceptional electrical conductivity and mechanical ***,CNTs can be incorporated into recycled paper as aﬁre retardant additive,enhancing itsﬂame resistance.G,renowned for its high surface area and excellent electrical conductivity,ﬁnds applications in electronics,sensors,catalysis,and water treatment,where it can be used to adsorb heavy metal ***,owing to their unique optical properties,are used in bioimaging,drug delivery,and optoelectronic *** harnessing the potential of LCMs,we can not only mitigate environmental concerns but also contri-bute to a sustainable *** research is essential to optimize synthesis methods,explore novel applica-tions,and unlock the full potential of these versatile materials.

关键词： Lignocellulosic materials carbon-based nanomaterials carbon allotropes

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The impact of alpha-fetoprotein(AFP),child-turcotte-pugh(CTP)score and disease staging on the survival of hepatocellular carcinoma(HCC)patients:a retrospective cohort from single oncology center

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Oncology Research 2025年第1期33卷 149-160页

作者： NAssER MULLA YOUsEF KATIB AsIM M.ALMUGHAMsI DUAA s.ALKHAYAT MOHAMED MOsAAD samir T.ALFOTIH RAWAN ALAOFI Department of Internal Medicine Faculty of MedicineTaibah UniversityMadinah42278Saudi Arabia Department of Radiology Faculty of MedicineTaibah UniversityMadinah42278Saudi Arabia Department of surgery Faculty of MedicineTaibah UniversityMadinah42278Saudi Arabia Department of Endemic and Infectious Diseases Suez Canal UniversityIsmailia41522Egypt King salman bin Abdulaziz Medical City Madinah42311Saudi Arabia Prince Mohammed Bin Abdulaziz Hospital Madinah41511Saudi Arabia

Background:Hepatocellular carcinoma(HCC)is the most common cause of cancer-related death in saudi *** study aimed to investigate the patterns of HCC and the effect of TNM staging,Alfa-fetoprotein(AFP),and Child-Turcotte Pugh(CTP)on patients’overall survival(Os).Methods:A retrospective analysis was conducted on 43 HCC patients at a single oncology center in saudi Arabia from 2015 to *** patients had to fulfill one of the following criteria:(a)a liver lesion reported as definitive HCC on dynamic imaging and/or(b)a biopsy-confirmed ***:The mean patient age of all HCC cases was 66.8 with a male-to-female ratio of 3.3:*** patients were stratified into two groups:viral HCC(n=22,51%)and non-viral HCC(n=21,49%).Among viral-HCC patients,55%were due to HBV and 45%due to *** was diagnosed in 79%of *** and sex did not significantly statistically differ in Os among viral and non-viral HCC patients(p-value>0.05).About 65%of patients had tumor size>5 cm during the diagnosis,with a significant statistical difference in Os(p-value=0.027).AFP was>400 ng/ml in 45%of the *** was a statistically significant difference in the Os in terms of AFP levels(p-value=0.021).A statistically significant difference was also observed between the CTP score and Os(p-value=0.02).CTP class B had the longest *** was the most common treatment provided to HCC patients followed by sorafenib *** was a significant statistical difference in Os among viral and non-viral HCC patients(p-value=0.008).Conclusions:The most common predictors for Os were the underlying cause of HCC,AFP,and tumor *** having non-viral etiology,a tumor size>5 cm,an AFP>400 ng/mL,and a CTP score class C were all negatively associated with Os.

关键词： Hepatocellular carcinoma Pattern Alpha-fetoprotein(AFP) Child-turcotte-pugh Progression free survival

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identifying glass foreign bodies using conventional X-ray in a gelatinous model

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World Journal of Emergency Medicine 2025年第1期16卷 71-73页

作者： samir Hammoud Kevin Tishkowski Ahmed Hammad Jehan Barbat Alysse Cohen Barry Brenner Emergency Medicine Department Garden City HospitalGarden City 48135USA

Retained foreign bodies are commonly seen in both the emergency department (ED) and the outpatient setting.^([1,2])The associated complications include inflammation,delayed healing,infection,damage to surrounding tissues,and disability.^([3,4])While most foreign bodies are locatable during an extensive wound-probing physical exam,they can be missed even when a welltrained clinician performs a thorough history and physical exam.^([5])Therefore,they are often a cause of malpractice litigations in the ED.

关键词： wound healing foreign

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Mossbauer,optical and structural properties of Fe^(3+) ion in borate glass

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Journal of Rare Earths 2025年第1期43卷 162-170,I0006页

作者： Essam A.Elkelany Hesham Y.Amin A.samir M.M.EL-Hady H.H.El-Bahnasawy Moukhtar A.Hassan Basic science Department Faculty of EngineeringSinai UniversityAl-Arish45511Egypt school of Information and Electrical Engineering Hangzhou City UniversityHangzhou30015China state Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou310027China Basic science Department Faculty of Engineering at ShoubraBenha University11629Egypt Physics Department Faculty of ScienceAl-Azhar University11884CairoEgypt

Lanthanum-bearing iron lithium borate glass is a quaternary system for oxide glasses and was prepared via the melt-quenching *** present article correlates the structure,optical,ligand field and M?ssbauer data on iron lithium borate glass co ntaining La^(3+).The density was measured,while the molar volume was *** physical parameters are *** increasing the La_(2)O_(3) content within the glass network,infrared spectra analysis reveals structural modifications such as the increase in BO_(4) units and the decline in both BO_(3) units and NBO bonds ***,optical absorption spectra were *** absorption spectra disclose a plethora of electronic transitions that are related to Fe^(3+)in tetrahedral and octahedral sites,however,Fe^(2+)phase is not observed in optical spectra,but it has a clear signature in M?ssbauer ***,the glass absorption edges undergo a clear blue shift,reflecting an increased band gap energy(1.96-2.28 eV).The decline in NBO bonds justifies this ***,the values of crystal field splitting are increased,while the values of Racah parameters are *** trend is justified by the decline in NBO bonds and increases electron localization around Fe cations.M?ssbauer spectra confirm the existence of Fe^(3+)in tetrahedral and octahedral sites,while Fe^(2+)exists in only a tetrahedral *** increasing La_(2)O_(3) content,the isomer shift of Fe^(3+)in tetrahedral sites changes to be 0.312-0.329 mm/s,while the isomer shift of octahedral Fe^(3+)is 0.424-0.456 mm/*** findings coincide with optical *** the isomer shift of tetrahedral Fe^(2+)is 0.902-0.911 mm/*** results of structural,optical and ligand field associated with M?ssbauer spectra open more vistas toward the utility of these samples in the optics realm.

关键词： Fe3+ions Rare-earth oxide Mossbauer spectra Ligand field parameters Optical properties

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Microwave-Assisted Acetylated Lignin Loaded into Cellulose Acetate for Efficient UV-shielding Films

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Journal of Renewable Materials 2025年第2期13卷 401-412页

作者： Ahmed M.Khalil samir Kamel Photochemistry Department National Research CentreGiza12622Egypt Cellulose and Paper Department National Research CentreGiza12622Egypt

Developing favorable bio-based polymers that replace petroleum-based plastics is an essential environmental *** is a by-product of the chemical pulping *** is a natural UV protection ingredient in broad-spectrum(UVA and UVB)*** could be partially and selectively acetylated in a simple,fast,and more reliable *** this work,a composite film was prepared with UV-resistant properties through a casting ***-based cellulose acetate(CA)was employed as a major matrix while nano-acetylated kraft lignin(AL-NPs)was used as filler during synthesizing UV-shielding films loaded with various amounts(1–5 wt.%)of *** lignin was acetylated through a simple and fast microwave-assisted process using acetic acid as a solvent and acetylating *** physicochemical and morphological characteristics of the prepared films were evaluated using different methods,including scanning electron microscopy(sEM),Fourier Transform Infrared spectroscopy(FTIR),X-ray diffraction analysis(XRD),mechanical testing and contact angle *** UV-Vis spectroscopy optical investigation of the prepared films revealed that AL-NPs in the CA matrix showed strong UV *** feature demonstrated the effectiveness of our research in developing UV-resistant bio-based polymer ***,the prepared films can be considered as successful candidates to be applied in packaging applications.

关键词： Cellulose acetate microwave-assisted acetylation nano lignin acetate UV-shielding

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Topical tacrolimus in anterior segment inflammatory disorders

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Eye and Vision 2017年第1期4卷 30-36页

作者： samir s.shoughy The Eye Center and the Eye Foundation for Research in Ophthalmology PO Box 55307Riyadh 11534Saudi Arabia

Immune mediated inflammatory anterior segment diseases are variable and their management requires intense *** with topical steroids is associated with serious ocular side *** order to overcome the potentially blinding complications of topical steroids,immunomodulatory drugs are being used more *** is a calcineurin inhibitor that induces suppression of T lymphocytes activity and reduction of ocular *** was recently investigated for application in various anterior segment inflammatory *** this review,we will discuss the therapeutic application of topical tacrolimus as a steroid-sparing agent in treating T cell mediated anterior segment inflammation.

关键词： Tacrolimus Topical Ocular Immune-mediated T cells

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selective and complementary use of Optical Coherence Tomography and Fluorescein Angiography in retinal practice

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Eye and Vision 2016年第1期3卷 202-210页

作者： samir s.shoughy Igor Kozak The Eye Center and The Eye Foundation for Research in Ophthalmology PO Box 55307Riyadh 11534Saudi Arabia King Khaled Eye specialist Hospital RiyadhSaudi Arabia

The current field of posterior pole and retinal imaging of the human eye has expanded into detailed analyses of the macula,retinal periphery,individual retinal layers,vitreoretinal interface,imaging of the choroid and the optic nerve *** challenge in retinal imaging is the enduring pursuit of deeper penetration into tissues,increased resolution to the cellular level,and interpretation of *** much deeper can we go and with what resolution and reproducibility?These are fundamental questions for experts in search of novel imaging *** discoveries may resolve existing controversies,but inevitably stimulate new *** technologies in retinal imaging include adaptive optics retinal imaging and optical coherence tomography-based retinal *** this review,the focus of our discussion will be the discrepancy between the findings(interpretation)of one imaging technology that do not agree or are not even found with a complementary *** a clearly seen abnormality is present with one technology but absent in another,what are the possible explanations?Following is a summary of key concepts of retinal and optic nerve imaging modalities and current controversies regarding their interpretation and/or limitations.

关键词： Retina Imaging Optical coherence tomography Fluorescein angiography

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stabilization and synchronization of Discrete-time Fractional Chaotic systems with Non-identical Dimensions

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Acta Mathematicae Applicatae sinica 2021年第3期37卷 523-538页

作者： samir BENDOUKHA Department of Electrical Engineering College of EngineeringYanbuTaibah UniversitySaudi Arabia

This paper investigates the stabilization and synchronization of two fractional chaotic maps proposed recently,namely the 2D fractional Hénon map and the 3D fractional generalized Hénon *** show that although these maps have non–identical dimensions,their synchronization is still *** proposed controllers are evaluated experimentally in the case of non–identical orders or time–varying *** methods are used to illustrate the results.

关键词： discrete chaos fractional discrete calculus Hénon based maps stabilization synchronization

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DUALITY OF GENERALIZED DUNKL-LIPsCHITZ sPACEs

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Acta Mathematica scientia 2017年第6期37卷 1567-1593页

作者： samir KALLEL Department of Mathematics Higher Institute of Computer Sciences and Mathematics of MonastirMonastir University5000 MonastirTunisia

Abstract The aim of this paper is to prove duality and reflexivity of generalized Lipschitz spaces ∧κα,p,q（R）, α ∈R and 1≤〈 p, q ≤∞, in the context of Dunkl harmonic analysis.

关键词： Dunkl operator duality Herz spaces heat transform Dunkl transform gen-eralized Dunkl-Lipschitz spaces

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snapthrough response of an innovative symmetric bistable composite wing

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Acta Mechanica sinica 2024年第9期40卷 68-82页

作者： sara Hijazi samir Emam Department of Mechanical Engineering American University of SharjahSharjah PO Box 26666United Arab Emirates

This study presents a numerical investigation into the equilibrium shapes and snapthrough response of an innovative bistable symmetric composite *** proposed design is a compound plate that consists of a symmetric flat platform followed by a winglet that utilizes the modified hybrid bistable symmetric laminate recently developed in the *** hybrid layup of the winglet resolves the issue of losing the bistability of the unsymmetric laminate when attached to another *** approximate analytical model based on the Rayleigh-Ritz method is developed for the compound plate that considers the geometric nonlinearity,the clamping conditions at the wing root,and the compatibility conditions at the *** static equilibrium positions predicted by the model were verified against the ABAQUs finite element(FE)results and an excellent agreement was *** influence of the geometrical and material parameters of the proposed design on the static equilibrium shapes and the snapthrough response was *** following parameters were considered:the length ratio of the flat plate to the bistable winglet,the thickness and location of the bidirectional glass epoxy layers,the load location,and the wing’s taperness and aspect *** parameters were found significant,and their effects were *** novelty of this work is that it presents the equilibrium shapes and the snapthrough response of a bistable laminate as a part of a bigger compliant structure,which mimics the scenario in real-life applications.

关键词： Compound laminate Bistable wing Hybrid symmetric laminates snapthrough

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