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Arish, Egypt

Shaban M.,Beni Suef University | Ali M.,Beni Suef University | Abdel-Hady K.,Elminia University | Hamdy H.,Beni Suef University
Current Nanoscience | Year: 2015

In this paper, a facile method to fabricate two-dimensional (2D) Sn nanoparticles is demonstrated. Sn nanoparticles are deposited on porous anodic alumina membrane (PAA) by using thermal vapor deposition (TVD) technique. A set of PAA membranes fabricated under the same conditions was coated with Sn for different periods of time. SEM images showed the formation of hexagonal nanoarrays of Sn around each nanopore following a selective agglomeration growth mechanism on the active dots of the PAA surface. As the deposition time increased from 1 to 3 min, the agglomerated particles height increased from 20 to 75 nm. Moreover, Sn was thermally deposited for 2 min onto PAA substrates of different pore diameters. As the pore diameter increases, the formed Sn particles diameter decreases and their density distribution around each pore is improved, which may be attributed to the dimensions of the active area of the PAA surface. According to reflection spectra, it was found that the oscillation strength of the samples increased as the deposition time increased to 2 min. For the time greater than 2 min, the oscillation strength decreased due to the scattering of light, particularly in the short wavelength region, that caused by the increase of sample roughness. © 2015 Bentham Science Publishers. Source

Atta H.,Assiut University | Abdel-Gawad E.A.,Elminia University | ElAzab A.,Assiut University | Saleh M.,Assiut University | And 3 more authors.
Egyptian Journal of Radiology and Nuclear Medicine | Year: 2016

Purpose: To develop a standardized technique to assess delineation of the whole ureter for the evaluation of symptomatizing urologic patients. Method and materials: 2500 patients are examined using 64-MDCT. Examinations were performed with oral hydration Group I (n = 834), Group II which received IV diuretics (n = 847), or Group III which received nothing (n = 819). Curved planar reformatted images were obtained manually to obtain the entire ureter in a single coronal oblique image. The ureter was divided into 3 anatomic segments for estimating the degree of its delineation where if the segment is assessed along its whole length it is graded as satisfactory delineation, otherwise it is graded as non-proper delineation. Delineation degrees for each ureteric segment were compared. Results: Satisfactory delineation obtained with group II (51.3%) was statistically higher than other groups with p value. <. 0.001, with a statistical significant result (p <. 0.001) as regards the delineation of ureteric segments and patients' sex; the middle and lower third segments show satisfactory delineation in group II with 86%, while the non-proper delineation is higher in females with percentage 66.1%, and the percentage of non-proper delineation among females is least recorded in group II. Conclusion: Curved sagittal oblique reformatted image with IV diuretics allows better tracing of the whole ureteric course. © 2016 The Egyptian Society of Radiology and Nuclear Medicine. Source

Shaban M.,Beni Suef University | Ali M.,Beni Suef University | Abdel-Hady K.,Elminia University | Hamdy H.,Beni Suef University
Micro and Nano Letters | Year: 2015

Self-ordered anodised aluminium oxide membranes can be used as a base for the growth of different nanoarrays. In this reported work, an efficient and effective method is implemented to fabricate highly ordered alumina nanowires (ANWs) covered with a uniform shell of 12±2nm Sn nanoparticles (Sn/ANWs). A two-step anodisation process followed by a selective etching process was used to prepare highly ordered ANWs with diameters smaller than 36 nm. The thermal evaporation technique was used to ensure the deposition of a Sn nanoshell on the fabricated nanowires. The fabricated nanostructures were characterised by energy-dispersive X-ray spectroscopy, X-ray diffraction, field emission-scanning electron microscopy and an ultraviolet-visible-near-infrared spectrophotometer. Analysis of the scanning electron microscopy images showed that the etching rate is 0.73 nm/min and ANWs are obtained after etching the membrane for 110 min. The measured reflection spectra revealed that Sn/ANWs exhibit a redshift of the UV absorption band relative to the ANWs and a reflectance of nearly 100% in the near-infrared region. For optical comparison, glass slides were coated with Sn under the same conditions for 90 and 120 s. The reflection spectrum of the 120 s Sn-coated glass slide shows three modes at 210, 296 and 700 nm because of the excitation and interference of plasmonic waves. © The Institution of Engineering and Technology 2015. Source

Kotb M.A.,Elminia University | Hamdi N.A.,Elminia University | Sobhy S.,Fayoum University
Egyptian Journal of Neurology, Psychiatry and Neurosurgery | Year: 2014

Background: Migraine is a common neurovascular disorder. Visual evoked potential (VEP) changes, between migraineurs and normal subjects, were often conflicting.Objective: Compare VEP (P100) in patients with migraine with and without aura to normal subjects, and the effect of prophylactic treatment.Methods: Visual evoked potential was recorded in 32 patients with migraine and 15 healthy control subjects.Results: P100 amplitude was significantly higher and its latency was significantly longer in patients with migraine compared to control subjects, this difference disappeared in patients with regular prophylactic treatment.Conclusion: Cortical excitability changes may be related to the pathophysiology of migraine and the efficacy of prophylactic treatment. © 2014 Egyptian Society of Neurology, Psychiatry, and Neurosurgery. All rights reserved. Source

Fathi D.,Kyoto University | Fathi D.,Elminia University | Ueki Y.,Kyoto University | Mima T.,Kyoto University | And 4 more authors.
Clinical Neurophysiology | Year: 2010

Objective: To test whether the normal aging itself may change the cortical plasticity in human. Methods: Motor-evoked potentials (MEPs) were measured from 48 right-handed healthy volunteers (age 21-79) before and after the paired associative stimulation (PAS), comprising a single electric stimulus to the right median nerve at wrist and subsequent transcranial magnetic stimulation (TMS) of the left primary motor cortex. Results: The magnitude of MEP increased by PAS in the young and middle but not in the elderly and its change was negatively correlated with the age. Conclusions: These results suggest that the human M1 shows age-dependent reduction of cortical plasticity. Significance: The reduction of the M1 plasticity may be caused by the attenuated responsiveness of intracortical circuits in the M1 and/or disrupted sensorimotor integration within basal ganglia-thalamocortical loop. © 2009 International Federation of Clinical Neurophysiology. Source

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