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The Impact of Developing Coordination Abilities on the Skill Abilities for Table Tennis Iuniors

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Sociology Study 2014年第10期4卷 829-838页

作者： Shawkat youssef Shawkat youssef Dr. Shawkat Gaber Radwan Ismailia41511 P.O. Box 436 Egypt

The coordination abilities are closely related to the development of technical motor skills, where the player cannot master the technical skills in the special activity, in case lack of special coordination abilities for this activity. Many of table tennis experts agree on that the special coordination abilities for table tennis include each of：（1） the motor adaptation and adjustment ability; （2） the ability to differentiate; （3） reaction speed ability; （4） orientation ability; （5） balance ability; （6） coupling ability; and （7） the ability to sense the rhythm. The aim of this study is to design a training program to develop the special coordination abilities of table tennis and identify the impact of this program on the general skill ability for table tennis juniors. The researcher used the experimental method in two groups： One group is experimental group and another is the control group. The most important result of this study was the training program led to the improvement of the special coordination abilities of table tennis for the experimental group, which led to higher levels of the general skill ability in table tennis for the experimental group more than the control group.

关键词： Table tennis coordination abilities general skill ability

Association analysis of FTO gene polymorphisms and obesity risk among Egyptian children and adolescents

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Genes & Diseases 2017年第3期4卷 170-175页

作者： Samar Samir Abdelmajed Mohamed youssef Moushira Erfan Zaki Naglaa Abu-Mandil Hassan Somaia Ismail October University for Modern Sciences and Arts(MSA) GizaEgypt Organic chemistry Department Faculty of scienceCairo UniversityEgypt Biological Anthropology Department Medical Research DivisionNational Research CentreEgypt Medical Molecular Genetics Department Human Genetics and Genome Research DivisionNational Research CentreGizaEgypt

Obesity is a common disorder that has a significant impact on human health as it may lead to many serious diseases and sometimes *** genome-wide association studies(GWAS)confirmed that there is a relationship between some variants in the first intron of the fat mass and obesity associated(FTO)gene and obesity in adults and children in different ethnic *** our study,the association of the FTO rs9939609 and rs17817449 variants with obesity was investigated in Egyptian children and *** examined rs9939609 and rs17817449 polymorphisms in 100 control and 100 obese cases,we used the restriction fragment length polymorphism(RFLP)technique to genotype the *** current study showed that there were no significant differences(P>0.05)between the cases and controls in both variants of rs17817449 and rs9939609 ***,there were significant correlations between rs17817449 and cholesterol and between rs9939609 and *** Current Study although the two variants(rs9939609 and rs17817449)didn’t show an association with obesity,but there was a correlation between the lipid profile and these two variants.

关键词： Children Egyptians Fat mass and obesity associated gene(FTO) Obesity Variants

Fatigue crack tip plastic zone ofα+βtitanium alloy with Widmanstatten microstructure

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Journal of Materials Science & Technology 2018年第11期34卷 2107-2115页

作者： Yingjie Ma Sabry S.youssef Xin Feng Hao Wang Sensen Huang Jianke Qiu Jiafeng Lei Rui Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Science and Technology of China(USTC) Hefei 230026China Northeastern University Shenyang 110089China

The recent studies had focused on the fatigue crack propagation behaviors of α＋β titanium alloys with Widmanstatten microstructure. The fascinated interest of this type of microstructure is due to the superior fatigue crack propagation resistance and fracture toughness as compared to other microstructures,which was believed to be related to the fatigue crack tip plastic zone（CTPZ）. In this study, the plastic deformation in fatigue CTPZ of Ti-6 A1-4 V titanium alloy with Widmanstatten microstructure was characterized by scanning electron microscope（SEM） and electron backscatter diffraction（EBSD）. The results showed that large-scale slipping and deformation twinning were generated in fatigue CTPZ due to the crystallographic feature of the Widmanstatten microstructure. The activation of twinning was related to the rank of Schmid factor（SF） and the diversity of twin variants developing behaviors reflected the influence of SF rank. The sizes of CTPZ under different stress intensity factors（K） were examined by the white-light coherence method, and the results revealed that the range of the plastic zone is enlarged with the increasing K（or crack length）, while the plastic strain decreased rapidly with the increasing distance from the crack surface. The large-scale slipping and deformation twinning in Widmannstatten microstructure remarkably expanded the range of fatigue CTPZ, which would lead to the obvious larger size of the observed CTPZ than that of the theoretically calculated size.

关键词： Titanium alloy Widmanstatten microstructure CTPZ Slip Deformation twinning

Light and Electron Microscopic Study of the Effect of Orlistat on the Liver of Adult Male Albino Rats and the Possible Protective Role of <i>β</i>-Carotene

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Forensic Medicine and Anatomy Research 2018年第2期6卷 20-36页

作者： Sahar youssef Anatomy Department Faculty of Medicine for Girls Al-Azhar University Cairo Egypt

Orlistat is a safe and effective drug to treat obesity by acting as a pancreatic and gastric lipase inhibitor, resulting in reduction in fat absorption. There is also concern that it may be linked with an increased threat of serious hepatic incidents. The present work was carried out to study the effect of orlistat on the histological, immunohistochemical and electron microscopic structure of the liver in the adult male albino rats and the possible protective role of β-carotene administration. Forty adult albino rats were subjected to experiment for two weeks as follows: group 1 (control), group II, each animal received 0.52 mg/kg bw/day β-Carotene, group III, each animal received orlistat 32 mg/kg/day, and group IV received β-Carotene, 1hour before the administration of orlistat at same dose of group II & III. The liver from each animal was dissected out and processed for histological, (light and electron microscopic study). The result of Hep-Par1 for immunohistochemistry was statistically analyzed. The results showed that orlistat treated group displayed variable disturbance of liver architecture, from dilatation, congested central and portal veins, branching of bile ductules, mononuclear cellular infiltration, areas of hemorrhages, cytoplasmic vacuolation and pyknotic nuclei. The most obvious changes were that degenerative changes in hepatocytes led to depletion of glycogen content of hepatocytes. Hep Par-1 revealed a wide area of negative immune expression around the central vein and in some hepatocytes. Other hepatocytes expressed weak reaction. Ultrastructure examination displayed hepatocytes with swollen mitochondria and others with an electron-dense matrix. The combined treatment of β-Carotene and orlistat led to a marked improvement in most of the previously mentioned changes. It was concluded that orlistat-induced hepatic toxicity. Thus, clinicians should cautiously monitor their patients for signs of hepatic dysfunction. Using an antioxidant such as β-Car

关键词： Liver Orlistat Ultrastructure β-Carotene

Production and Characterization of a Composite Based on Plaster and Juncus Maritimus Plant Fibers

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Fluid Dynamics & Materials Processing 2024年第9期20卷 2059-2076页

作者： Mina Amazal Soumia Mounir Asma Souidi Malika Atigui Slimane Oubeddou youssef Maaloufa Ahmed Aharoune Laboratory of Thermodynamics and Energetics Faculty of ScienceUniversity of Ibn ZohrDakhlaAgadir80000Morocco National School of Architecture Agadir New ComplexUniversity of Ibn ZohrDakhlaAgadir80000Morocco

Nowadays,materials with a limited impact on the environment are required in the construction *** the interesting properties of natural elements such as natural fibers,it seems advantageous to use them to reinforce materials while protecting the environment and guaranteeing economic *** these lines,this research was devoted to studying the effect of untreated natural fibers extracted from the Juncus maritimus plant(from Southern Morocco)on ***,the effect of the percentage of added fibers on the fluidity of the plaster was evaluated by means of the Marsh’s cone method,that is,by measuring the time taken by a known volume of plaster to flow from a cone through a short ***,the highly porous microstructure of the plaster was observed using a scanning electron microscope(SEM).The diffractogram of Juncus maritimus fibers was built by means of a X-ray diffraction(XRD)*** values obtained for the wet thermal conductivity of the composites decreased from 0.4853 W/m.K for the reference specimen to 0.4324 W/m K for a fiber volume content of 40%.The densities were calculated to determine the lightness of each *** mechanical strengths[flexural and compressive]were evaluated for different percentages of rush *** addition of 20%volume fiber was found to improve the flexural strength to 3.63 MPa compared to the sample without fiber(3.36 MPa),thereby ensuring good toughness of the considered ***,a reduction in compressive strength was observed,due to the poor adhesion between the fibers and the plaster matrix.

关键词： Composite material juncus maritimus plant plaster thermophysical properties mechanical properties microstructure

Demography and Conflicts in the Context of Israel/Palestine： Forecasts for the Future

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International Relations and Diplomacy 2014年第7期2卷 462-476页

作者： youssef Courbage Institut National d'Etudes Demographiques (INED) Paris France

In the context of historical Palestine, the Palestinian and Jewish demography are deeply embedded （Goldsheider, 1991; Freidlander, 2002）. The growth and structure of the populations are one of the most important tools for the control of the territory （Dahlan, 1989）. Jewish immigration was and is still considered as the single most important mean for the conquest of the land （Courbage, 2005）. Yet this is only a partial truth （Fargues, 2000）. Fertility, especially when it is natural at its peak or still very high is also a very significant asset, which is likely to reverse internal equilibrium among the different forces shaping the two societies （Courbage ＆ Todd, 2011; Ettinger, 2011）. Hence, Jews and Palestinians have embarked since decades into a demographic competition （Faraoune, personal communication, December 19, 1992; Anson ＆ Avinoam, 1996）, with this extraordinary result, that in a matter of a century （1948-2048） this small piece of land will have undergone the highest population growth on earth, equivalent to sub Saharan Africa （Faitelson, 2008; Courbage ＆ Fargues, 1997）. It is likely output is not less important to define the future nature of historical Palestine： one or two states （Baskin, 2005; Courbage, 2008）？ And if the two states solution is in effect, what kind of states would it be？ After presenting the recent trends of Palestinian demography in the context of historical Palestine since the first intifada and the aftermath of the second intifada, this essay will focus on future developments, i.e. the likely population dynamics of the Palestinian territory from 2011 until 2048, and of its different components, namely fertility. Palestinian population growth during the next four decades will be compared to that of the future Israeli population and the policy components of this differential population growth will be evaluated both in the context of historical Palestine and in the context of the Jewish State in its 1948 borders （Jews and Palestinians of 1

关键词： demographies structure of the populations Palestine

Categorization of Faults and Failures in Concrete Structures, Its Causes and Magnitude of Effects

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材料科学与工程（中英文B版） 2017年第5期7卷 237-245页

作者： youssef Hamze Faculty of Engineering Lebanese University Beirut 96 Lebanon

S is for Spelling - and Success

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基础教育外语教学研究 2015年第1期 21-25页

作者： youssef Mezrigui

具备一定的拼写能力对英语学习者至关重要。然而，在很多英语课堂中，学生的拼写能力并没有得到应有的重视，我国基础教育阶段英语教学中也存在此类现象。或许通过阅读本文，很多英语教师会大大增进对拼写能力重要性的了解。本文不仅分... 详细信息

具备一定的拼写能力对英语学习者至关重要。然而，在很多英语课堂中，学生的拼写能力并没有得到应有的重视，我国基础教育阶段英语教学中也存在此类现象。或许通过阅读本文，很多英语教师会大大增进对拼写能力重要性的了解。本文不仅分析了英语教学中教授拼写的原因，同时，也列举了教师教授拼写以及改善学生的拼写能力的方法与策略。本刊希望该文能对广大读者与英语教师的英语教学有所启发和帮助。

关键词：英语学习学习方法阅读知识阅读材料

Synthesis and Characterization of Some Transition Metal Chelates of 5-(1-Hydroxy-6-Naphthylazo-3-Sodium Sulphonate) Thiobarbituric (L_1) and Barbituric (L_2) Acids

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Journal of Materials Science & Technology 1999年第3期15卷 263-266页

作者： Nabil S. youssef and K.H.Hegab(Inorganic Chemistry Department, National Research Center, Dokki., Giza, Egypt) Natl Res Ctr Dept Inorgan Chem Giza Egypt

Some transition metal chelates of two ligands L1 and L2 were prepared and characterized by elemental analysis. The IR and 1H NMR spectra of several chelates of two ligands L1 and L2 showed the involvement of the azo group in chelation with the transition metaI ions, in most of the studied chelates, and that the two ligands L1 and L2 showed the involvement of the azo group in chelation with the transition metal ions, in most of the studied chelates, and that the two ligands L1 and L2 were coordinated either in the enol or the keto form. IR spetra also showed that Fe(III)-, Ni(II)-, Mn(II)-, VO(II)-L1 and Cu(II)-L2 chelates behaved in a bidentate manner, in contrast with the two (1:1) M:L cobalt chelates with the two ligands are *** analysis indicated the presence of three to twelve water molecules of hydration eliminated on heating up to 150℃ and one or two coordinated water molecules removed at 150~180℃.The octahedral structure is proposed fOr all the chelates, except Cu(II)-L2 and Ni(II)-L1 chelates which have square planar geometry, based on their electronic spectra

关键词： III Acids Hydroxy-6-Naphthylazo-3-Sodium Sulphonate L1 L2 Synthesis and Characterization of Some Transition Metal Chelates of 5 Thiobarbituric and Barbituric