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Effect of Bi Additions on Structure and Properties of Sn-9Zn-lAg Lead-Free Solder Alloys

材料科学与工程（中英文B版） 2012年第6期2卷 381-388页

作者： El Said Gouda Heba abdel aziz Solid State Physics Department Physics Division National Research Center Dokki Giza 12622 Egypt Physics Department Faculty of Science Helwan University Helwan 11795 Egypt

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Synthesis of an eco-friendly nanocomposite fertilizer for common bean based on carbon nanoparticles from agricultural waste biochar

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Pedosphere 2021年第6期31卷 923-933页

作者： Dina M.SALAMA mahmoud E.ABD EL-aziz Mehrez E.EL-NAGGAR Essam A.SHAABAN Mohamed S.ABD EL-WAHED Vegetable Research Department National Research Centre33 El Bohouth StreetDokkiGiza 12622(Egypt) Polymers&Pigments Department National Research Centre33 El Bohouth StreetDokkiGiza 12622(Egypt) Textile Research Division National Research Centre33 El Bohouth StreetDokkiGiza 12622(Egypt) Pomology Department National Research Centre33 El Bohouth StreetDokkiGiza 12622(Egypt) Botany Department National Research Centre33 El Bohouth StreetDokkiGiza 12622(Egypt)

The burning of agricultural waste is a major cause of environmental *** this study,we sought to prepare biochar from agricultural waste as a source material for the preparation of carbon nanoparticles(CNPs).Surface morphology,hydrodynamic particle size,and purity and crystallinity of CNPs were extensively investigated using transmission electron microscopy(TEM),zeta sizing,and X-ray diffraction(XRD)spectroscopy,*** CNPs were subsequently immersed in a solution of potassium nitrate(KNO_(3))to prepare a CNPs/NK nanocomposite(CNPs loaded with nitrogen(N)and potassium(K))as a nanocomposite fertilizer for common bean(Phaseolus vulgaris L.).The CNPs/NK nanocomposite was sprayed as a foliar fertilizer at 0,10,20,30,and 40 mg L^(-1) on common bean plants 25 d after sowing on a farm in Shebin El-Kom,El-Monifia,*** growth,yield,and quality of common bean were investigated during two successive growing seasons(2017 and 2018).The highest seed yields of 2.04 and 2.01 t ha^(-1) and the highest values of growth parameters including plant height of 61.5 and 59.2 cm,number of leaves per plant of 35 and 35,number of flowers per plant of 83.3 and 82.7,and plant fresh weight of 148.7 and 152.8 g plant^(-1) were obtained when using the CNPs/NK nanocomposite at a concentration of 20 mg L^(-1) during the 2017 and 2018 growing seasons,respectively.

关键词： foliar fertilizer N and K-loaded nanosized carbon particles Phaseolus vulgaris L. plant growth yield

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Finite element modeling assumptions impact on seismic response demands of MRF-buildings

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 821-834页

作者： Shehata E abdel Raheem Ahmed K abdel Zaher Ahmed MA Taha Civil Engineering Department Engineering College Taibah University Civil Engineering Department Faculty of Engineering Assiut University

Recent seismic events have raised concerns over the safety and vulnerability of reinforced concrete moment resisting frame ＂RC-MRF＂ buildings. The seismic response of such buildings is greatly dependent on the computational tools used and the inherent assumptions in the modelling process. Thus, it is essential to investigate the sensitivity of the response demands to the corresponding modelling assumption. Many parameters and assumptions are justified to generate effective structural finite element（FE） models of buildings to simulate lateral behaviour and evaluate seismic design demands. As such, the present study focuses on the development of reliable FE models with various levels of refinement. The effects of the FE modelling assumptions on the seismic response demands on the design of buildings are investigated. the predictive ability of a FE model is tied to the accuracy of numerical analysis; a numerical analysis is performed for a series of symmetric buildings in active seismic zones. The results of the seismic response demands are presented in a comparative format to confirm drift and strength limits requirements. A proposed model is formulated based on a simplified modeling approach, where the most refined model is used to calibrate the simplified model.

关键词： RC-MRF buildings design codes provisions seismic design finite element modeling modeling assumptions response demands

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Mathematical modeling and optimal control problems in brain tumor targeted drug delivery strategies

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International Journal of Biomathematics 2017年第4期10卷 235-296页

作者： aziz Belmiloudi Mathematics Research Institute of Rennes (IRMAR) European University of Brittany (UEB) 20 Av. des Buttes de Coesmes CS 14315 35043 Rennes Cedex France

In this paper, we present a mathematical model that describes tumor-normal cells inter- action dynamics focusing on role of drugs in treatment of brain tumors. The goal is to predict distribution and necessary quantity of drugs delivered in drug-therapy by using optimal control framework. The model describes interactions of tumor and normal cells using a system of reactions^diffusion equations involving the drug concentration, tumor cells and normal tissues. The control estimates simultaneously blood perfusion rate, reabsorption rate of drug and drug dosage administered, which affect the effects of brain tumor chemotherapy. First, we develop mathematical framework which mod- els the competition between tumor and normal cells under chemotherapy constraints. Then, existence, uniqueness and regularity of solution of state equations are proved as well as stability results. Afterwards, optimal control problems are formulated in order to minimize the drug delivery and tumor cell burden in different situations. We show existence and uniqueness of optimal solution, and we derive necessary conditions for optimality. Finally, to solve numerically optimal control and optimization problems, we propose and investigate an adjoint multiple-relaxation-time lattice Boltzmann method for a general nonlinear coupled anisotropic convection-diffusion system （which includes the developed model for brain tumor targeted drug delivery system）.

关键词： Optimal control coupled nonlinear reaztion-diffusion equations anisotropicbrain tumor growth diffusion tensor drug delivery chemotherapy real-time monitoringof distribution logistic growth pointwise controllers adjoint system population dyna-mics magnetic resonance imaging (MRI) convection-enhanced delivery (CED) adjointmultiple-relaxation-time lattice Boltzmann method multiscale Chapman-Enskog expan-sion optimization of therapies.

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Combined Sacral Nerve Roots Stimulation and Low Thoracic Spinal Cord Stimulation for the Treatment of Chronic Pelvic Pain

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Pain Studies and Treatment 2014年第2期2卷 86-90页

作者： Samer abdel-aziz Ahmed Ghaleb Department of Anesthesiology and Pain Medicine University of Arkansas for Medical Sciences Little Rock USA

Some pelvic pain syndromes are very resistant to medical treatment. Several studies have demonstrated that sacral neuromodulation, which has been successfully used for the treatment of bladder dysfunction, incontinence, urinary retention and urinary frequency [1]-[3], can be successfully used for the treatment of chronic pelvic pain [4]-[7]. Several studies have also demonstrated significant involvement of dorsal column pathways in the transmission of visceral pelvic pain [8] and the successful use of spinal cord stimulation for the treatment of chronic pelvic pain [9]. We report three cases of severe chronic pelvic pain that failed conservative treatment modalities. Placement of a combined sacral nerve roots stimulator and a low thoracic spinal cord stimulator resulted in a significant pain relief and improvement in daily life activities. We believe that this combination may help patients suffering from chronic pelvic pain resistant to medical management.

关键词： Chronic Pelvic Pain Sacral Nerve Roots Stimulation Thoracic Spinal Cord Stimulation

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Evaluation of the 8th AJCC staging system for pathologically versus clinically staged pancreatic adenocarcinoma: A time to revisit a dogma?

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Hepatobiliary & Pancreatic Diseases International 2018年第1期17卷 64-69页

作者： Omar abdel-Rahman Clinical Oncology Department Faculty of Medicine Ain Shams University

Background: The 8 th edition of the American Joint Committee on Cancer(AJCC) staging system for pancreatic exocrine adenocarcinoma has been released. The current study seeks to assess the 7 th and 8 th editions among patients registered within the surveillance, epidemiology and end results(SEER) ***: SEER database(2010–2013) has been accessed through SEER*Stat program and AJCC 8 th edition stages were reconstructed utilizing the collaborative stage descriptions. Kaplan–Meier analysis of overall survival and pancreatic cancer-specific survival analyses(according to both 7 th and 8 th editions and according to whether pathological or clinical staging were conducted) has been performed. Multivariate analysis of factors affecting pancreatic cancer-specific survival was also conducted through a Cox proportional hazard ***: A total of 18 948 patients with pancreatic adenocarcinoma were identified in the period from 2010–2013. Pancreatic cancer-specific survival among pathologically staged patients and according to the 8 th edition showed significant differences for all pair wise comparisons among different stages(P < 0.0001) except for the comparison between stage IA and stage IB(P = 0.307) and the comparison between stage IB and stage IIA(P = 0.116). Moreover, P value for stage IA vs IIA was 0.014; while pancreatic cancer-specific survival according to the 7 th edition among pathologically staged patients showed significant differences for all pair wise comparisons among different stages(P < 0.0001) except for the comparison between IA and IB(P = 0.072), the comparison between stage IIA and stage IIB(P = 0.065), the comparison between stage IIA and stage Ⅲ(P = 0.059) and the comparison between IIB and Ⅲ(P = 0.595).Among clinically staged patients(i.e. those who did not undergo initial radical surgery), the prognostic performance of both 7 th and 8 th stages for both overall survival and pancreatic cancer-specific survival was ***: Th

关键词： Pancreatic cancer AJCC SEER Prognosis

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Fabrication of novel ZnO/MnWO_4 nanocomposites with p-n heterojunction: Visible-light-induced photocatalysts with substantially improved activity and durability

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Journal of Materials Science & Technology 2018年第10期34卷 1891-1901页

作者： Mahsa Pirhashemi aziz Habibi-Yangjeh Department of Chemistry Faculty of Science University of Mohaghegh Ardabili P.O. Box 179 Ardabil Iran

We report, for the first time, binary ZnO/MnW04 nanocomposites with p-n heterojunction fabricated by a simple ultrasonic-calcination route. The phase structure, morphology, and optical along with tex- tural properties were comprehensively characterized. The photocatalytic performance was studied via degradations of rhodamine B, methyl blue and methyl orange （RhB, MB, MO）, and fuchsine pollutants under visible-light illumination. The ZnO/MnW04 nanocomposites exhibited better photocatalytic per-formance than their single components and the nanocomposite with 30 wt% MnW04 showed the highest activity. Photocatalytic performance of this nanocomposite is 22.5, 17.7, 26.8, and 23.9 times higher than that of the ZnO sample in degradations of RhB, MB, MO, and fuchsine dyes, respectively. The improved photocatalytic performance was ascribed to the formation ofp-n heterojunction between ZnO and MnW04 with high charge separation efficiency as well as strong visible-light absorption ability. The possible mechanism for the improved photocatalytic performance was proposed. This study revealed that the novel ZnO/MnW04 p-n heterojunction can act as a promising visible-light-active photocatalyst for environmental applications.

关键词： ZnO/MnW04 p-n heterojunction Visible-light-active Photocatalyst

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Numerical Simulation of Dual-Phase-Lag Model and Inverse Fractional Single-Phase-Lag Problem for the Non-Fourier Heat Conduction in a Straight Fin

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Journal of Thermal Science 2020年第3期29卷 632-646页

作者： MOZAFARIFARD Milad AZIMI aziz MEHRZAD Salem Department of Mechanical Engineering Shahid Chamran University of AhvazAhvaz ***Iran

In recent years,many studies have been done on heat transfer in the fin under unsteady boundary conditions using Fourier and non-Fourier *** this paper,unsteady non-Fourier heat transfer in a straight fin having an internal heat source under periodic temperature at the base was investigated by solving numerically Dual-Phase-Lag and Fractional Single-Phase-Lag *** this way,the governing equations of these models were presented for heat conduction analysis in the fin,and their results of the temperature distribution were validated using the theoretical results of Single and Dual-Phase-Lag *** that,for the first time the order of fractional derivation and heat flux relaxation time of the fractional model were obtained for the straight fin problem under periodic temperature at the base using Levenberg-Marquardt parameter estimation *** solve the inverse fractional heat conduction problem,the numerical results of Dual-Phase-Lag model were used as the *** results obtained from Fractional Single-Phase-Lag model could predict the fin temperature distribution at unsteady boundary condition at the base as well as the Dual-Phase-Lag model could.

关键词： non-Fourier heat transfer fractional calculus inverse heat transfer Levenberg-Marquardt straight fin unsteady boundary condition

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Change in Impedance with Change in Posture during Spinal Cord Stimulator Placement

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Pain Studies and Treatment 2014年第2期2卷 70-72页

作者： Samer abdel-aziz Ahmed Ghaleb Department of Anesthesiology and Pain Medicine University of Arkansas for Medical Sciences Little Rock USA

In this article we discuss the effect of posture on impedance during the placement of a spinal cord stimulator. Although, according to several studies, there appears not to be a specific and consistent change in impedance with change in posture, we noticed on multiple occasions that if the impedance remains very high during spinal cord stimulator (SCS) lead placement, asking the patient to sit up from the prone position may drop the impedance down. This could be explained by having air around the lead, from using loss of resistance to air technique in finding the epidural space, which moves up when sitting the patient up, or having the lead immersed in epidural fat. Sitting the patient up from the prone position should be tried if the impedance remains very high before aborting the procedure and taking the lead out.

关键词： Impedance Spinal Cord Stimulator Change in Posture

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An application of a simple computer program for neutron activation analysis

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Journal of Environmental Sciences 2001年第1期13卷 22-24页

作者： N.abdel Basset Nuclear Physics Laboratory Ain Shams UniversityFaculty of Girs-HeliopolisCairoEgypt

A simple computer program is designed for estimation of elemental concentration values in complex samples by neutron activation analysis technique. The program is applied for an Egyptian cement sample which irradiated at the Egyptian Research Reactor 1(ET RR 1). The data obtained is compared with the reported values. The time consumed for such calculations has a remarkable reduction in comparison with the routine work.

关键词： neutron activation analysis cement sample Egypt

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