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Abdelaziz, Ashraf Omar,Elbaz, Tamer Mahmoud,Shousha, Hend Ibrahim,Ibrahim, Mostafa Mohamed,El-Shazli, Mostafa Abdel Rahman,Abdelmaksoud, Ahmed Hosni,Aziz, Omar Abdel,Zaki, Hisham Atef,Elattar, Inas An Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.9
Background: Hepatocellular carcinoma (HCC) is a dismal tumor with a high incidence, prevalence and poor prognosis and survival. Management of HCC necessitates multidisciplinary clinics due to the wide heterogeneity in its presentation, different therapeutic options, variable biologic behavior and background presence of chronic liver disease. We studied the different prognostic factors that affected survival of our patients to improve future HCC management and patient survival. Materials and Methods: This study is performed in a specialized multidisciplinary clinic for HCC in Kasr El Eini Hospital, Cairo University, Egypt. We retrospectively analyzed the different patient and tumor characteristics and the primary mode of management applied to our patients. Further analysis was performed using univariate and multivariate statistics. Results: During the period February 2009 till February 2013, 290 HCC patients presented to our multidisciplinary clinic. They were predominantly males and the mean age was $56.5{\pm}7.7years$. All cases developed HCC on top of cirrhosis that was mainly due to HCV (71%). Most of our patients were Child-Pugh A (50%) or B (36.9%) and commonly presented with small single lesions. Transarterial chemoembolization was the most common line of treatment used (32.4%). The overall survival was 79.9% at 6 months, 54.5% at 1 year and 22.4% at 2 years. Serum bilirubin, site of the tumor and type of treatment were the significant independent prognostic factors for survival. Conclusions: Our main prognostic variables are the bilirubin level, the bilobar hepatic affection and the application of specific treatment (either curative or palliative). Multidisciplinary clinics enhance better HCC management.
Abdelaziz Timesli 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.26 No.1
Concrete is the most widely used substance in construction industry, so it’s been required to improve its quality using new technologies. Nowadays, nanotechnology offers new frontiers for improving construction materials. In this paper, we study the stability analysis of the Single Walled Carbon Nanotubes (SWCNT) reinforced concrete cylindrical shell embedded in elastic foundation using the Donnell cylindrical shell theory. In this regard, we propose a new explicit analytical formula of the critical buckling load which takes into account the distribution of SWCNT reinforcement through the thickness of the concrete shell using the U, X, O and V forms and the elastic foundation using Winkler and Pasternak models. The rule of mixture is used to calculate the effective properties of the reinforced concrete cylindrical shell. The influence of diverse parameters on the stability behavior of the reinforced concrete shell is also discussed.
The iterated projection method for integro-differential equations with Cauchy kernel
Abdelaziz Mennouni 한국전산응용수학회 2013 Journal of applied mathematics & informatics Vol.31 No.5
In this paper we propose the iterated projection method forthe approximate solution of an integro-differential equations with Cauchykernel in L2([-1, 1],C) using Legendre polynomials. We prove the convergenceof the method. A system of linear equations is to be solved. Numerical examples illustrate the theoretical results.
Creep Effect on Composite Beam with Perfect Steel-concrete Connection
Abdelaziz Souici,Mohamed Tehami,Nacer Rahal,M. S. Bekkouche,J. F. Berthet 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.2
In the context of primary creep, a new approach to the study of the effects of creep on the resistance of a composite beam is reported. The beam is in perfect connection, statically determinate and bent under a moderate load applied at time t0. The proposed model is based primarily on the theory of linear viscoelasticity of concretes and specifically on the principle of the irreversible law of deformation established by Dischinger. In this work, two equations of equilibrium and two other equations of compatibility at the steel-concrete interface are considered. This compatibility is rewritten according to Dischinger’s rheological equation for ageing materials while adopting elastic behaviour for the metal profile. Then, the mathematical treatment of the written compatibility should lead to the establishment of a system of two differential equations of the first order. The analytical resolution of this system provides the expressions for the generalized internal forces of the composite beam in terms of time. Using these mathematical expressions, it is easy to predict the state of internal stresses and the strains of the beam at any time, t. Finally, the proposed analytical approach is confronted with various other methods.
MANY VALUED LOGIC AND INTUITIONISTIC FUZZY SETS: A STONE THEOREM GENERALIZATION
( Abdelaziz Amroune ),( Bijan Davvaz ) 호남수학회 2015 호남수학학술지 Vol.37 No.3
Atanassov introduced another fuzzy object, called intu- itionistic fuzzy set as a generalization of the concept of fuzzy subset. The aim of this paper is the elaboration of a representation theory of involutive interval-valued ALukasiewicz-Moisil algebras by using the notion of intuitionistic fuzzy sets.
Versatile Roles of Microbes and Small RNAs in Rice and Planthopper Interactions
Abdelaziz Mansour,Mannaa Mohamed Ibrahim Mohamed Ahmed,Omar Hewedy,Mostafa G. Ali,정혜정,서영수 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.5
Planthopper infestation in rice causes direct and indirect damage through feeding and viral transmission. Host microbes and small RNAs (sRNAs) play essential roles in regulating biological processes, such as metabolism, development, immunity, and stress responses in eukaryotic organisms, including plants and insects. Recently, advanced metagenomic approaches have facilitated investigations on microbial diversity and its function in insects and plants, highlighting the significance of microbiota in sustaining host life and regulating their interactions with the environment. Recent research has also suggested significant roles for sRNA-regulated genes during rice–planthopper interactions. The response and behavior of the rice plant to planthopper feeding are determined by changes in the host transcriptome, which might be regulated by sRNAs. In addition, the roles of microbial symbionts and sRNAs in the host response to viral infection are complex and involve defense-related changes in the host transcriptomic profile. This review reviews the structure and potential functions of microbes and sRNAs in rice and the associated planthopper species. In addition, the involvement of the microbiota and sRNAs in the rice–planthopper–virus interactions during planthopper infestation and viral infection are discussed.
Abdelaziz Salhi,Salaheddine Sayouri,Lahoucine Hajji,TajEddine Lamcharfi 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
Nanocrystalline barium titanate (BT) was synthesized by the sol gel method. The dry gel obtained was first treated in themicrowave (MW) and then calcined at different temperatures. A pure tetragonal phase was obtained under heat treatmentat 750 oC which is a relatively low temperature. SEM image reveals a fairly dense and uniform microstructure. Dielectricmeasurements performed on the sintered BaTiO3 sample at 1200 oC revealed the presence of the resonance phenomenon atfrequencies lower than 2 MHz and the existence of a weak positive temperature coefficient of resistivity (PTCR) just abovethe Curie temperature. Electric impedance analysis shows the predominance of the grain boundary (gb) contribution andenables determination of activation energies of the gb and the bulk effect and their relative capacitance and resistanceelements.
Topologies on determined by sequences
Abdelaziz Raouj,Abderrahim Naciri 장전수학회 2023 Advanced Studies in Contemporary Mathematics Vol.33 No.1
Topologies on determined by sequences
High Gain Adaptive Observer Design for Sensorless State and Parameter Estimation of Induction Motors
Abdelaziz Maouche,Mohammed M’Saad,Bachir Bensaker,Mondher Farza 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.5
This paper addresses the problem of accurately estimating the mechanical and magnetic state variables as well as the stator and rotor resistances of induction motors using only the stator current measurements and the supplied stator voltages from an appropriate nonlinear parametrization. The involved estimation is carried out by a high gain adaptive observer designed bearing in mind the available fundamental results together with the useful implementation features, namely conception simplicity and computational efficiency. An exponential convergence of the state and parameter estimation errors is established under admissible assumptions, namely the persistent excitation requirement has been particularly reduced thanks to the introduction of unknown parameter characteristic indices. The effectiveness of the adaptive observer is highlighted throughout simulation results involving a typical induction motor.