In the present investigation two different types of fiber reinforced polymer composites were prepared by hand lay-up method using three different parameters (curing temperature, pressing load and fiber volume fraction). These composites were prepared from the polyester resin as the matrix material reinforced with glass fibers as first group of samples and mat Kevlar fibers as the second group, both with different volume fractions (4%, 8%, and 12%) of fibers. They were then tested by tensile strength and impact strength. The main objective in this study is to use Taguchi method for predicting the better parameters that give the better tensile and impact strength to the composites, and then preparing composites at these parameters and comparing them with the randomly used once. The experimental and analytical results showed that the Taguchi method was successful in optimizing the parameters that give the highest properties and it can find the most influential parameter regardless of the material used. Also it showed that the volume fraction was the most influential parameter on the tensile and impact strength. The difference between these composites was in the properties values and that the Kevlar composites have higher tensile and impact strength.
لقد اعتبر انسان وادي الرافدين قديماً، الكون عبارة عن دولة كونية، وكل مافيه - اي الكون كان يعد عبارة عن ذوات فردية، فكل حي وجماد وفكرة مجردة وكل حجر وكل شجرة وكل خاطر يتمتع بارادة ذاتية وشخصية خاصة، لقد تمثل الكون في ذهن الانسان بهيئة واحدة الا وهي نظام من الارادات فالكون ككل منسق انما هو مجتمع، أو دولة فكانت هذه الدولة الكونية تضم إلى جانب الشخصيات الفعالة في هيئة الحكم اعضاء لم يكن لهم نفوذ في السياسة ولا دور ل
... Show Moreيبحث هذا البحث في افعال المقاربة التي تعد من الافعال الناسخة في اللغة العربية التي تدخل على الجملة الاسمية فتبقي المبتدأ مرتفعا بها ويسمى اسمها وتنصب خبره وتقسم هذه الافعال الى اقسام ثلاثة افعال المقاربة وهي (كاد ,اوشك ,كرب هلهل ,قارب ) وافعال الرجاء وهي (عسى , اخلولق , حرى ) وافعال الشروع وهي (اخذ ,وهب ,بدأ ,انشا , شرع , اقبل ,قام ) وتشابه كاد في معناها وفائدتها جعل وشرع وعلى الرغم من عدم ذكر القران الكريم لأي اية فيها
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Humans have considerations of gender male and female, and many of them have preferential male versus female, and became such considerations solid in the minds of some of the intellectuals, public and most of the people; as a fact for granted, and that's what get them to prefer of boys over females.
Marriage is a sacred bond in all religions, including the Islamic law, but the early marriage in particular – as the focus of my research - is common in Islamic regions, especially for girls, and it has been approved by Islamic law in accordance with special criteria and
العلوم السياسية بين الطرح النظري والبعد العملي
The use of the word “war” alone raises horror and fear in the hearts of the recipients, especially if this war aimed at human’s life, his health and his future. It is the electronic advertising war among rival international companies that use cyberspace to create fear and horror in the hearts of the recipients because it connects the use of the product with human’s death or serious illness.
The problem of this research sheds light on the new uses of cyberspace which fucked by international companies to strike the interests of each other by displaying the defects of their products and its negative impact on citizen’s life. Despite the fact that those wars have opposed strongly, there are supporters for those wars. Their argu
Muslim doctors have long spared no effort in diagnosing the various embryonic diseases that have afflicted the fetus since its early days in his mother's womb. The most important of these
جدلية العلاقة بين الديمقراطية - المواطنة والمجتمع المدني
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