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Acta Mathematicae Applicatae Sinica 2017年第2期33卷 297-310页

作者： Eid H. DOHA Ali H. BHRAWY Ramy M. HAFEZ Department of Mathematics Faculty of Science Cairo University Giza Egypt Department of Mathematics Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Mathematics Faculty of Science Beni-Suef University Beni-Suef Egypt Department of Mathematics Alwagjh University College University of Tabuk Tabuk Saudi Arabia Department of Basic Science Institute of Information Technology Modern Academy Cairo Egypt

A new spectral Jacobi rational-Gauss collocation （JRC） method is proposed for solving the multi- pantograph delay differential equations on the half-line. The method is based on Jacobi rational functions and Gauss quadrature integration formula. The main idea for obtaining a semi-analytical solution for these equations is essentially developed by reducing the pantograph equations with their initial conditions to systems of algebraic equations in the unknown expansion coefficients. The convergence analysis of the method is analyzed. The method possesses the spectral accuracy. Numerical results indicating the high accuracy and effectiveness of this algorithm are presented. Indeed, the present method is compared favorably with other methods.

关键词： multi-pantograph equation delay equation collocation method Jacobi-Gauss quadrature Jacobirational functions convergence analysis

新一代羟乙基淀粉与人血白蛋白在活体肝移植中安全性的比较

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麻醉与镇痛 2011年第1期7卷 84-91页

作者： Ahmed Mukhtar Fawzia Aboulfetouh Gihan Obayah Maged Salah Mohamed Emam Yehia Khater Ramzia Akram Aly Hoballah Mohamed Bahaa 沈文振(译) 岳云(校) Department of Anesthesia and Intensive Care Cairo University Giza Wadi-Alneel liver Transplant center Cairo Egypt Department of Surgery Ain Shams University Cairo Egypt 不详

背景血容量替代治疗是肝移植围手术期管理的重要部分。目前尚缺乏羟乙基淀粉（HES）应用于肝移植患者的相关安全性数据。我们评估了新一代羟乙基淀粉130／0．4应用于肝移植围手术期管理的安全性，并着重分析了其对肾功能的影响。方法行... 详细信息

背景血容量替代治疗是肝移植围手术期管理的重要部分。目前尚缺乏羟乙基淀粉（HES）应用于肝移植患者的相关安全性数据。我们评估了新一代羟乙基淀粉130／0．4应用于肝移植围手术期管理的安全性，并着重分析了其对肾功能的影响。方法行活体肝移植的40例患者被预先随机分成两组。ALB组患者（n=20）给予5％人血自蛋白，HES组（n=20）给予第三代羟乙基淀粉（6％HES130／0．4）。胶体总量被限制在50ml·kg^-1·d^-1，容量输注使肺小动脉楔压或中心静脉压维持在5—7mmHg。如需要额外的液体，则用平衡盐溶液替代。麻醉和手术操作过程均被标准化。分别测定麻醉诱导后、手术结束时、手术后前4天的动脉血肌酐和血清半胱氨酸蛋白酶抑制剂C（cystatin C）血浆水平。结果所有40例登记患者完成了研究。两组患者的人口统计学及手术中变量均具有可比性。手术后胶体液输入量分别是HES组6229±1140ml和ALB组4636±1153ml（P=0．003）。与ALB组（1100±900m1）相比，HES组（3047±2000ml）有更大的净累积液体平衡量（P=0．029）。两组血肌酐水平、肌酐清除率、cystafin C血浆水平差异无显著性。每组各有一例患者合并急性肾功能衰竭需行肾脏替代治疗。结论HES130／0．4做为人血白蛋白的替代品对肝移植术后肾功能的影响与后者相似。

关键词：羟乙基淀粉130 人血白蛋白活体肝移植安全性急性肾功能衰竭半胱氨酸蛋白酶抑制剂围手术期管理肝移植患者

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

Changes in Germination and Seedling Traits of Sesame under Simulated Drought

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Phyton-International Journal of Experimental Botany 2022年第4期91卷 713-726页

作者： Mukhtar Ahmed Ahmed M.S.Kheir Muhammad Zeeshan Mehmood Shakeel Ahmad Mirza Hasanuzzaman Department of Agronomy PMAS-Arid Agriculture UniversityRawalpindi46300Pakistan International center for Biosaline Agriculture Directorate of ProgramsDubai14660United Arab Emirates Soils Water and Environment Research InstituteAgricultural Research CenterCairo UniversityGiza12613Egypt Department of Agronomy Bahauddin Zakariya UniversityMultan60800Pakistan Department of Agronomy Sher-e-Bangla Agricultural UniversityDhaka1207Bangladesh

Drought is considered one of the leading abiotic constraints to agricultural crop production *** study was conducted to assess the effects of different drought treatments(***,10%PEG,and 20%PEG)on seed germination,germination indices,seedling traits,and drought tolerance indices of *** results showed that maximum reduction in the studied parameters was observed at higher PEG concentration(i.e.,20%PEG).As compared to control,the drought treatments viz.10%and 20%PEG decreased the values for germination indices,such as germination percentage,coefficient of variation of germination time,germination index,and seedling vigor ***,for seedling traits,the values were decreased for root length,shoot length,root shoot ratio,root fresh weight,shoot fresh weight,root dry weight and shoot dry weight under 10%and 20%PEG treatments significantly in comparison with ***,relative to control,the values for drought tolerance indices,such as germination drought tolerance index,root length drought tolerance index,shoot length drought tolerance index,total seedling length drought tolerance index,root fresh weight drought tolerance index,shoot fresh weight drought tolerance index,total fresh weight drought tolerance index,root dry weight drought tolerance index,shoot dry weight drought tolerance index and total dry weight drought tolerance index were also reduced under 10%and 20%PEG treatments,*** results confirms that drought impact on seed germination and seedling traits could be quantified by using different indices which can further help to design drought adaptation and mitigation *** on these results it can be concluded that germination indices,seedling traits,and drought tolerance indices have great potential to simulate drought stress impacts on different crop traits thus they should be used in all kinds of stress related studies.

关键词： Sesame drought stress PEG germination indices seedling traits drought tolerance indices

Amoxicillin–clavulanic acid induced sperm abnormalities and histopathological changes in mice

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Asian Pacific Journal of Tropical Biomedicine 2017年第9期7卷 809-816页

作者： Maha A. Fahmy Ayman A. Farghaly Enayat A. Omara Zeinab M. Hassan Fawzia A.E. Aly Souria M. Donya Aziza A.E. Ibrahim Elsayed M. Bayoumy Department of Genetics and Cytology National Research CentreDokkiGizaEgypt Department of Pathology National Research CentreDokkiGizaEgypt Department of Chemistry of Natural Compounds National Research CentreDokkiGizaEgypt Hydrobiology Department National Research CentreDokkiGizaEgypt Biology Department Girls Science CollegeUniversity of DammamSaudi Arabia

Objective: To explore the genotoxic potential and histopathological changes induced in liver, kidney, testis, brain and heart after using the antibiotic drug amoxicillin/clavulanic acid(4:1).Methods: The study included chromosomal aberration analysis in bone-marrow and mouse spermatocytes, induction of sperm morphological abnormalities and histopathological changes in different body organs. The drug was administrated orally at a dose of81 mg/kg body weight twice daily(Total = 162 mg/kg/day) for various periods of time equivalent to 625 mg/men(twice daily).Results: The results revealed non-significant chromosomal aberrations induced after treatment with amoxicillin/clavulanic acid(AC) in both bone marrow and mouse spermatocytes after 7 and 10 days treatment. On the other hand, statistically significant percentages of sperm morphological abnormalities were recorded. Such percentage reached 8.10 ± 0.55, 9.86 ± 0.63 and 12.12 ± 0.58 at the three time intervals tested(7, 14 and 35 days after the 1 st treatment respectively)(treatment performed for 5 successive days) compared with 2.78 ± 0.48 for the control. The results also revealed histopathological changes in different body organs after AC treatment which increased with the prolongation of the period of therapy. Congestion of central vain, liver hemorrhage and hydropic changes in hepatocytes were noticed in the liver. Degenerative changes were found in kidney glomerulus and tubules while testis showed atrophy of seminiferous tubules, and reduction of spermatogenesis. AC also induced neurotoxicity and altered brain neurotransmitter levels. Hemorrhage in the myocardium, disruption of cardiac muscle fibers and pyknotic nuclei in cardiomyocytes were recorded as side effects of AC in heart ***: The results concluded that AC treatment induced sperm morphological abnormalities and histopathological changes in different body organs. Clinicians must be aware of such results while describing the drug.

关键词： Amoxicillin/clavulanic acid Genotoxicity Sperm abnormalities Histopathological changes

An Optimized Ensemble Model for Prediction the Bandwidth of Metamaterial Antenna

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Computers, Materials & Continua 2022年第4期71卷 199-213页

作者： Abdelhameed Ibrahim Hattan F.Abutarboush Ali Wagdy Mohamed Mohamad Fouad El-Sayed M.El-kenawy Computer Engineering and Control Systems Department Faculty of EngineeringMansoura UniversityMansoura35516Egypt Electrical Engineering Department College of EngineeringTaibah UniversityMedina42353Saudi Arabia Operations Research Department Faculty of Graduate Studies for Statistical ResearchCairo UniversityGiza12613Egypt Wireless Intelligent Networks center(WINC) School of Engineering and Applied SciencesNile UniversityGizaEgypt Department of Communications and Electronics Delta Higher Institute of Engineering and TechnologyMansoura35111Egypt Faculty of Artificial Intelligence Delta University for Science and TechnologyEgypt

Metamaterial Antenna is a special class of antennas that uses metamaterial to enhance their *** size affects the quality factor and the radiation loss of the *** antennas can overcome the limitation of bandwidth for small *** learning(ML)model is recently applied to predict antenna *** can be used as an alternative approach to the trial-and-error process of finding proper parameters of the simulated *** accuracy of the prediction depends mainly on the selected *** models combine two or more base models to produce a better-enhanced *** this paper,a weighted average ensemble model is proposed to predict the bandwidth of the Metamaterial *** base models are used namely:Multilayer Perceptron(MLP)and Support Vector Machines(SVM).To calculate the weights for each model,an optimization algorithm is used to find the optimal weights of the *** Group-Based Cooperative Optimizer(DGCO)is employed to search for optimal weight for the base *** proposed model is compared with three based models and the average ensemble *** results show that the proposed model is better than other models and can predict antenna bandwidth efficiently.

关键词： Metamaterial antenna machine learning ensemble model multilayer perceptron support vector machines

Concircular π-Vector Fields and Special Finsler Spaces

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Advances in Pure Mathematics 2013年第2期3卷 282-291页

作者： Nabil L. Youssef Amr Soleiman Department of Mathematics Faculty of Science Benha University Benha Egypt Department of Mathematics Faculty of Science Cairo University Giza Egypt center for Theoretical Physics (CTP) The British University in Egypt (BUE) Cairo Egypt

The aim of the present paper is to investigate intrinsically the notion of a concircular π-vector field in Finsler geometry. This generalizes the concept of a concircular vector field in Riemannian geometry and the concept of concurrent vector field in Finsler geometry. Some properties of concircular π-vector fields are obtained. Different types of recurrence are discussed. The effect of the existence of a concircular π-vector field on some important special Finsler spaces is investigated. Almost all results obtained in this work are formulated in a coordinate-free form.

关键词： Finsler Manifold Cartan Connection Concurrent π-Vector Field Concircular π-Vector Field Special Finsler Space Recurrent Finsler Space

Assessment of coal gasification in a pressurized fixed bed gasifier using an ASPEN plus and Euler–Euler model

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International Journal of Coal Science & Technology 2020年第3期7卷 516-535页

作者： Tamer M.Ismail Mingliang Shi Jianliang Xu Xueli Chen Fuchen Wang M.Abd El-Salam Mechanical Engineering Department Suez Canal UniversityIsmailiaEgypt Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education East China University of Science and TechnologyShanghaiChina Shanghai Engineering Research center of Coal Gasification East China University of Science and TechnologyShanghaiChina Department of Basic Science Cairo UniversityGizaEgypt

With the help of Aspen Plus,a two-dimensional unsteady CFD model is developed to simulate the coal gasification process in a fixed bed gasifier.A developed and validated two dimensional CFD model for coal gasification has been used to predict and assess the viability of the syngas generation from coal gasification employing the updraft fixed bed *** process rate model and the sub-model of gas generation are *** particle size variation and char burning during gasification are also taken into *** order to verify the model and increase the understanding of gasification characteristics,a set of experiments and numerical comparisons have been carried *** simulated results in the bed are used to predict the composition of syngas and the conversion of *** model proposed in this paper is a promising tool for simulating the coal gasification process in a fixed bed gasifier.

关键词： Fixed bed gasifier Aspen plus Euler-Euler model Coal

Biodiesel Production from <i>Spirulina-Platensis</i>Microalgae by <i>In-Situ</i>Transesterification Process

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Journal of Sustainable Bioenergy Systems 2013年第3期3卷 224-233页

作者： H. I. El-Shimi Nahed K. Attia S. T. El-Sheltawy G. I. El-Diwani Chemical Engineering and Pilot Plant Department National Research Center Dokki Egypt Chemical Engineering Department Faculty of Engineering Cairo University Giza Egypt

This research investigates the effect of reaction variables that strongly affect the cost of biodiesel production from non-edible Spirulina-Platensis microalgae lipids, and use the acid-catalyzed in situ transesterification process. Experiments were designed to determine how variations in volume of reacting methanol, the concentration of an acid catalyst, time, temperature and stirring affected the biodiesel yield. The total lipid content of Spirulina-Platensis microalgae was obtained to be 0.1095g/g biomass. The weight of the by-product glycerol obtained was used to predict the percentage yield conversion of microalgae oil biodiesel. Best results (84.7%), a yield of fatty acid methyl ester (FAME), were obtained at 100% (wt./***) catalyst concentration, 80 ml methanol volumes, 8 h reaction time and 65℃ reaction temperature with continuous stirring at 650 rpm. Properties of the produced biodiesel were measured according to EN 14214 standards.

关键词： Biodiesel Spirulina-Platensis Microalgae In-Situ Transesterification

Impact of the Changes in Women’s Characteristics over Time on Antenatal Health Care Utilization in Egypt (2000-2008)

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Open Journal of Obstetrics and Gynecology 2015年第10期5卷 542-552页

作者： Hassan H. M. Zaky Dina M. Armanious Mohamed Ali Hussein School of Humanities and Social Sciences the American University in Cairo Cairo Egypt Department of Statistics Faculty of Economics and Political Science Cairo University Giza Egypt Social Research center of the American University in cairo Cairo Egypt Faculty of Arts and Social Sciences Kingston University London UK Faculty of Commerce South Valley University Qena Egypt

Objectives: This study empirically assesses the impact of the changes in women’s characteristics, empowerment, availability and quality of health services on woman’s decision to use antenatal care (ANC) and the frequency of that use during the period 2000-2008. Study Design: The study is a cross-sectional analytical study using 2000 and 2008 Egypt Demographic and Health Surveys. Methods: The assessment of the studied impact is conducted using the Zero-inflated Negative Binomial Regression. In addition, Factor Analysis technique is used to construct some of the explanatory variables such as women’s empowerment, the availability and quality of health services indicators. Results: Utilization of antenatal health care services is greatly improved from 2000 to 2008. Availability of health services is one of the main determinants that affect the number of antenatal care visits in 2008. Wealth index and quality of health services play an important role in raising the level of antenatal care utilization in 2000 and 2008. However, the impact of the terminated pregnancy on receiving ANC increased over time. Conclusions: Further research of the determinants of antenatal health care utilization is needed, using more updated measures of women’s empowerment, availability and quality of health services. In order to improve the provision of antenatal health care services, it is important to understand barriers to antenatal health care utilization. Therefore, it is advisable to collect information from women about the reasons for not receiving antenatal care.

关键词： Women’s Characteristics Antenatal Health Care Women’s Empowerment Zero-Inflated Negative Binomial Regression Egypt