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Accelerated versus standard corneal cross linking in the treatment of ectasia post refractive surgery and penetrating keratoplasty: a medium term randomized trial

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International Journal of Ophthalmology(English edition) 2019年第11期12卷 1714-1719页

作者： Hany A.Khairy Moataz F.Elsawy Khaled Said-ahmed Marwa A.Zaki sameh S Mandour Department of Ophthalmology Menoufia University Hospitals

AIM: To compare the clinical outcomes of the standard corneal cross linking(CXL) and the accelerated CXL in patients with progressive corneal ectasia post refractive surgery and penetrating ***: Totally 120 eyes of 83 patients scheduled to receive either standard CXL(3 m W/cm^2 for a period of 30 min) or accelerated CXL(18 m W/cm2 for a period of 5 min). The main outcomes for comparison were the change in: maximum-K reading(K-max), manifest refractive spherical equivalent(SE), central corneal thickness(CCT), and the best corrected distance visual acuity(CDVA).RESULTS: One hundred and eleven eyes completed the study. The main outcome measurement was the K-max reading. Both group showed significant improvement in the value postoperatively at 6 and 12 mo. The mean change in the standard group was 1.21±0.11 D and in the accelerated group was 0.90±0.05 D at the end of 12 mo postoperatively, with no statistically significant difference between the 2 groups. Similarly, CDVA improved significantly from their preoperative value in the standard group by 2.98±0.11 letters, and in the accelerated group by 2.20±0.06 letters, with no statistically significant difference between the two groups. Both of the SE, and CCT showed no statistically significant difference at the end of follow up period in each ***: Both standard CXL and accelerated CXL are safe and effective treatment in halting ectasia after corneal refractive surgery. The accelerated CXL results are comparable to the standard CXL with short time exposure of the cornea to ultraviolet irradiation, leading to reduced operation time, reduced operative ocular discomfort, and corneal haze.

关键词： corneal cross linking accelerated refractivesurgery penetrating keratoplasty corneal ectasia

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Natural Convection Flow and Heat Transfer Enhancement of a Nanofluid past a Truncated Cone with Magnetic Field Effect

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World Journal of Mechanics 2012年第5期2卷 272-279页

作者： sameh E. ahmed A. Mahdy Mathematics Department Faculty of Science South Valley University Qena Egypt

A nonsimilarity analysis is performed to investigate the laminar, free convection boundary layer flow over a permeable isothermal truncated cone in the presence of a transverse magnetic field effect. A suitable set of dimensionless variables is used and non-similar equations governing the problem are obtained. Fourth order Runge-Kutta with shooting technique is employed for the numerical solution of the obtained equations. Different water-based nanofluids containing Cu, Ag, CuO, Al2O3, and TiO2 are taken into consideration. The effects of pertinent parameters such as the solid volume fraction of nanoparticles, and magnetic field parameter have been investigated. Furthermore, different models of nanofluid based on different formulas for thermal conductivity and dynamic viscosity on the flow and heat transfer characteristics are discussed. Various comparisons with previously published work for the case of a vertical plate are performed and the results are found to be in excellent agreement.

关键词： Nanofluid Truncated Cone Magnetic Field Natural Convection Non-Similarity Solution

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Concomitant Boost Radiotherapy after Conservative Breast Surgery in Early Breast Cancer

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Advances in Breast Cancer Research 2016年第3期5卷 97-102页

作者： Hend ahmed El-Hadaad Hanan ahmed Wahba Waleed Elnahas sameh Roshdy Clinical Oncology & Nuclear Medicine Mansoura University Mansoura Egypt Surgical Oncology Unite Mansoura Oncology Center Mansoura Egypt

Background: Radiation therapy after breast conserving surgery is a standard part of treatment for invasive breast cancer. Based on radiobiological models, it was found that shorter radiation schedules offered the promise of equivalent local control to standard radiation therapy by giving larger doses per fraction in shorter period of time. Methods: This study included 36 female patients with operable invasive stage I-II breast cancer. These patients underwent microscopic wide local excision of the primary tumor and lymph node dissection. They received adjuvant radiotherapy. The radiation dose was 40 Gy total dose in 15 fractions for whole breast and additional dose of 9 Gy in three consecutive fractions was delivered to tumour cavity simultaneously. Results: Mean age was 52 years (range: 30 - 67);most patients were of stage II disease and Grade II was the most common one. Invasive ductal carcinoma was reported in 94.4% and 72.2% of patients were hormone receptor positive. After median follow-up of 52 months, all patients were alive and ipsilateral local recurrence was reported in 1 case only. Grade IV radiation toxicity was not observed;moist desquamation was the most common acute reaction (61%) with grade III in 5.5% followed by dry desquamation in 55.6% of grade I only. Grade I erythema was recorded in 41.7% and grade II in 11%. Fibrosis was the most frequent late reaction (44.3%) with grade II in 11% followed by telengectesia then pigmentation (41.7%, 33.3% respectively). Conclusion: The regimen used in this study appears promising with acceptable acute toxicities and convenient for our patients and has the advantage of economic use of radiation facilities. However, larger number of patients and longer period of follow-up are needed for further evaluation.

关键词： Conservative Breast Surgery Radiotherapy Concomitant Boost Breast Cancer

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Groundwater Conditions and the Geoenvironmental Impacts of the Recent Development in the South Eastern Part of the Western Desert of Egypt

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Journal of Water Resource and Protection 2014年第4期6卷 381-401页

作者： ahmed Aziz Abdel Moneim sameh Zaki Maghawri Diab Faculty of Science Minofiya University Menufia Egypt Faculty of Science Sohag University Sohag Egypt The Egyptian Mineral Resources Authority Cairo Egypt

The area to the southeast of the Western Desert of Egypt has been subjected to considerable development activities over the last few years. The development includes the cultivation of about 2260 km2 of the desert lands “the well-known Toshka Project”. The hydrogeological conditions of the area are subjected to detailed investigation based upon the construction of the water table maps, hydrologeologic cross-sections, pumping tests, aquifer geometry, and recharge-discharge relationship. The study revealed that the Quaternary and the Nubia sediments are the main water bearing layers in the area. The Quaternary aquifer is of limited potential and made of mixed sand with clay deposit ranges in thickness between 5 to 10 m. The Nubia aquifer is the oldest sedimentary formation and the main groundwater resources in the area. It is represented by multilayered of sand and silt exists generally under artesian conditions. It is composed of three water bearing horizons partially separated by two confining horizons and extends in thickness ranges between 70 and 230 meters. The thickness increases away from the high dam lake. The analysis of pumping tests of the aquifer indicated that its potentiality is increasing north of the High Dam Lake (HDL) whereas it decreases in the other direction. This is due to high hydraulic conductivity and aquifer thickness in the area northeast of Khor Toshka and at west of Garf Hussein. The hydraulic conductivity of the aquifer ranges between 12.73 and 0.9 m/day. The review of the changes in groundwater levels in the area showed that there is a drop in ranges between 1 and 14 meters in the last few years indicating that the extraction from the groundwater is much more higher that the replacement rate. Also, the analysis of the fluctuation of water levels of the HDL and the groundwater level indicated that the influence of water on groundwater level in the area is observed only at a distance less than 10 km from the lake shore line. Seepage from th

关键词： Toshka Project Groundwater Aswan High Dam Lake (Nasser Lake) Aquifer Potentiality Geo-Environmental Impacts

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爱资哈尔大学的中国留学生群体研究:以1931至1938年间为主

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华东师范大学学报（自然科学版） 2020年第S1期 27-31页

作者： ELMASHALY sameh ahmed Ali 沐涛华东师范大学历史系上海200241 埃及爱资哈尔大学伊斯兰研究系埃及开罗

0引言近代以来,随着丝绸之路的开通,中、埃文化交流有了更多的形式,具体表现在有大量的中国学生以学术团体的方式前往埃及留学.埃及作为世界上最重要的文明古国之一,又是历史悠久的伊斯兰文化国家,是许多中国留学生心仪的目的国,而位于... 详细信息

0引言近代以来,随着丝绸之路的开通,中、埃文化交流有了更多的形式,具体表现在有大量的中国学生以学术团体的方式前往埃及留学.埃及作为世界上最重要的文明古国之一,又是历史悠久的伊斯兰文化国家,是许多中国留学生心仪的目的国,而位于开罗的爱资哈尔大学更是最佳选择.中国的回族青年自20世纪30年代起前往爱资哈尔大学留学.这些远赴埃及留学的青年学子,构成了中国近现代史上爱国青年海外留学史的重要组成部分,他们中的一些优秀代表人物,如马坚、纳忠、海维谅等,在积极推动中国与阿拉伯世界之间思想与学术方面的交流中作出了突出的贡献.

关键词：爱资哈尔大学中国留学生学术贡献文化交流

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Application of Salt Whey from Egyptian Ras Cheese in Processed Cheese Making

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Food and Nutrition Sciences 2013年第9期4卷 79-86页

作者： sameh Awad Nour Elhoda ahmed Morsi El Soda Department of Dairy Science and Technology Faculty of Agriculture Alexandria University Alexandria Egypt Department of Dairy Science and Technology Faculty of Agriculture Alexandria University Alexandria Egypt.

The objective of this study was to evaluate characteristics of processed cheese made from salt Ras cheese whey and young Cheddar containing exopolysaccharide producing cultures (EPS) as compared with those in cheese made from EPS-negative cheeses. Processed cheeses were manufactured using young (1 day) or 1-month-old EPS-positive or EPSnegative Cheddar cheese and replacing the added water by Ras cheese whey or ultrafiltrated (UF) whey. Moisture and fat of processed cheese were standardized to 54% and 23%, respectively. Exopolysaccharide-positive processed cheese was softer, less chewy and gummy than the EPS-negative cheeses. The hardness and chewiness were lower in processed cheeses made from 1-month-old Cheddar than in the corresponding cheeses made from 1-day-old Cheddar cheese. Sensory scores for texture of EPS positive processed cheeses were higher than those of the EPS-negative cheeses. Generally, processed cheese made from replacing all added water with whey received higher scores in flavor and overall than did the corresponding cheeses made without whey. The obtained results are showing promise for application of salt whey in processed cheese making.

关键词： Processed Cheese Exopolysaccharide Producing Cultures Salt Whey UF Whey

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Unsteady MHD Mixed Convection Flow with Slip of a Nanofluid in the Stagnation Region of an Impulsively Rotating Sphere with Effects of Thermal Radiation and Convective Boundary Conditions

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World Journal of Mechanics 2018年第5期8卷 137-160页

作者： sameh E. ahmed Z. Z. Rashed Mathematics Department Faculty of Science South Valley University Qena Egypt Mathematics Department Faculty of Science and Arts Jouf University Qurayyat KSA

Unsteady magnetohydrodynamic mixed convection flow of an electrically conducting nanofluid in a stagnation region of a rotating sphere is studied numerically in the present article. Slip and convective boundary conditions are imposed to surface of the sphere and the thermal radiation effects are taken into account. The nanofluid is simulated using Buongiorno’s nanofluid model and the nanofluid particle fraction on the boundary is considered to be passively rather than actively controlled. Non-similar solutions are applied on the governing equations and the MATLAB function bvp4c is used to solve the resulting system. Effects of the key-parameters such as slip parameter, Biot number, radiation parameter, rotation parameter, Lewis number and Brownian motion parameter on the fluid flow, temperature and nanoparticle volume fraction characteristics are examined. Details of the numerical solution and a comprehensive discussion with the physical meaning for the obtained results are performed. The results indicated that the increase in slip parameter enhances the velocity profiles, while it decreases the temperature distributions. Also, the increase in either slip parameter or Biot number causes an improvement in the rate of heat transfer.

关键词： MHD Slip Nanofluids Convective Condition Radiation

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Musculcutanous Sarcoidosis Following Intramuscular Injection of Synthol;Case Study

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Journal of Biosciences and Medicines 2022年第2期10卷 51-57页

作者： Medhat ahmed Fouad Shalaby Mamdooh ahmed Khairy sameh Hassan al Zayat Samy Abd Alhakim Rheumatology Department Faculty of Medicine AL-Azhar University Cairo Egypt

Sarcoidosis is a non caseating granulomatous disease of unknown etiology. Many factors may be attributed to the occurrence of that granuloma including the chemical factors. We present this case aiming to highlight Synthol injection which is chemical substance frequently used by athletics to increase their muscle size as it can trigger the occurrence of musculocutanous sarcoidosis. In conclusion Synthol should be added to the chemical list which can induce musculocutanous sarcoidosis.

关键词： Sarcoidosis Synthol

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Colorectal cancer in Arab world:A systematic review

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World Journal of Gastrointestinal Oncology 2021年第11期13卷 1791-1798页

作者： Nahed A Makhlouf Muhammad Abdel-Gawad Aya M Mahros sameh A Lashen Mariam Zaghloul ahmed Eliwa Eman E Elshemy Zainab Ali-Eldin Doaa Abdeltawab Fathiya El-Raey Dalia Omran Marwa Khalaf Nancy Fanous ahmed Shawkat Abdelmohsen ahmed Abu-Elfatth Mohamed Abdelghani Mahmoud Farouk Mohamed Abdelaziz Mohamed Alboraie Department of Tropical Medicine and Gastroenterology Faculty of MedicineAssiut UniversityAssiut 71515Egypt Department of Hepatology Gastroenterologyand Infectious DiseasesAl-Azhar UniversityAssiut 71631Egypt Department of Hepatology Gastroenterology and Infectious DiseasesKafrelsheikh UniversityKafrelsheikh 33656Egypt Department of Internal Medicine Alexandria UniversityAlexandria 21521Egypt Department of Internal Medicine Al-Azhar UniversityCairo 11884Egypt Department of Hepatogastroenterology and Infectious Diseases Al-Azhar UniversityCairo 11651Egypt Department of Internal Medicine Ain Shams UniversityCairo 11646Egypt Department of Hepatogastroenterology and Infectious diseases Faculty of MedicineAl-Azhar UniversityDamietta 34511CairoEgypt Department of Endemic Medicine Cairo UniversityCairo 12613Egypt Department of Tropical Medicine and Gastroenterology Assiut Liver CenterAssiut 71511Egypt Department of Gastroenterology Hepatology and EndoscopyPolice Authority HospitalCairo 12654Egypt Department of Clinical Oncology and Nuclear Medicine Al-Azhar UniversityCairo 11824Egypt

BACKGROUND The incidence of colorectal cancer(CRC)is increasing among young individuals in the Arab world as well as in other regions of the *** To explore the incidence and prevalence of CRC in the Arab *** The PubMed,Scopus,Web of Science,EBSCO and Wiley databases were searched to retrieve relevant articles irrespective of the language or the publication *** search terms were("colon OR rectum OR sigmoid OR rectal OR colonic OR colorectal")AND("cancer OR malignancy OR malignant OR neoplasm")AND("Jordan"OR"United Arab Emirates"OR"Bahrain"OR"Tunisia"OR"Algeria"OR"Djibouti"OR"Saudi Arabia"OR"Sudan"OR"Syria"OR"Somalia"OR"Iraq"OR"Oman"OR"Palestine"OR"Qatar"OR"Comoros"OR"Kuwait"OR"Lebanon"OR"Libya"OR"Egypt"OR"Morocco"OR"Mauritania"OR"Yemen").Reviews,metaanalyses,and articles containing nonoriginal data were *** articles were screened,and relevant data were *** statistics were used for data *** Nine studies were *** of the studies provided information regarding the prevalence of *** prevalence of CRC was 0.72% in Saudi Arabia and 0.78% in the United Arab Emirate,while in Egypt,it ranged from 0.4% to 14%.Four studies showed information regarding the *** annual incidence rate of CRC in Qatar was 7.5/100000/*** Egypt,the crude incidence rate(CIR)in males was 3.1 for colon cancer and 1 for rectal cancer,while in females,it was 2.3 for colon cancer and 0.8 for rectal *** age-standardized rate for CRC incidence in 2003 was 36.90 for males,26.50 for females,and 30.49 for both sexes in Saudi *** 2016,the CIRs in Saudi Arabia were 3.6 and 2.1 in females for colon cancer and rectal cancer,respectively,while in males,it was 3.3 and 2.8 for colon cancer and rectal cancer,*** study in Egypt revealed that 25% of CRC cases occurred among individuals younger than 40 years *** There is a considerable prevalence of CRC in some Arab *** studies are n

关键词： Colorectal cancer Incidence Prevalence Arab world

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Evaluation of Gallium Arsenide Thermal Expansion Coefficient by Extended X-Ray Absorption Fine Structure

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World Journal of Condensed Matter Physics 2019年第2期9卷 37-46页

作者： Gora Dieye sameh I. ahmed Abdou C. Wade Djibril Diop Département de Physique Faculté des Sciences et Techniques Université Cheikh Anta Diop Dakar Senegal Department of Physics Faculty of Science Ain Shams University Cairo Egypt

Negative thermal expansion of gallium arsenide has been investigated through temperature dependent Extended X-ray Absorption Fine Structure (EXAFS) measurements. The bond thermal expansion coefficient αbond has been evaluated and compared to negative expansion coefficient αtens due to tension effects. The overall thermal expansion coefficient is the sum?of?αbond?and αtens. Below 60 K, αtens is greater than αbond? yielding to a negative expansion in this temperature region. Tension effects are progressively overcome by the stretching effects in the region 60 - 300 K. The asymmetry of nearest neighbors distribution is not negligible since the gaussian approximation underestimates the bond expansion by about 0.00426 Å. This error decreases when the temperature is lowered. The accuracy in the thermal expansion evaluation and the connection between third cumulant and thermal expansion are discussed.

关键词： Negative Thermal Expansion Tension Effects EXAFS Asymmetry Gallium Arsenide

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