101,136 research outputs found
Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys
No full textThe Hall–Petch relation has long been used to relate the yield strength of a metal to its grain sizes in which the effectiveness of grain size strengthening in the metal is dictated by the Hall–Petch coefficient (slope). Therefore, understanding the microstructural dependence of the Hall–Petch slope would be very useful in designing new high-strength ultrafine grained (UFG) metallic materials. In this study, we investigated the microstructural factors affecting the Hall–Petch slope in UFG Al-Mg alloys with an average grain size range from 374 to 639 nm and different Mg contents of 0, 2.5, 5, and 7.5 at. pct. The rods prepared by extrusion of mechanically alloyed powder compacts were annealed for 5 hours at 380 °C, 420 °C, and 500 °C respectively followed by water quenching to produce the alloy samples in this study. The measured Hall–Petch slopes of the samples were found to increase with increasing Mg content and had higher values than those previously reported for Al(Mg) solid solutions with Mg concentrations comparable to the Mg contents in this study. Analysis of X-ray diffraction, transmission electron microscopy, and atom probe tomography experimental data as well as strengthening mechanisms demonstrates that the formation of nanoscale MgO dispersions plays a major role in the improved Hall–Petch slope observed in Al-Mg alloys
Maktabat Al Muthanna Baghdad Feb-May 1962
No full textOn the same date, Ali Al-Mansouri issued an official financial statement confirming that the Al-Khanji Foundation owed a total of 11.375.أصدر علي المنصوري بيانًا ماليًا رسميًا بتاريخ 25 نيسان 1962 يُفيد بأن مؤسسة الخانجي مدينة بمبلغ إجمالي قدره 11,375
Qilādat al-jawāhir fī dhikr al-Ghawth al-Rifāʻī wa-atbāʻih al-akābir
No full textA book on Sufism on the Rifa'i way, in which the author collects virtues, conditions, dignity, sayings, behavior, method, and the realizations of the truth of Sheikh Ahmed Muhyi al-Din Abu al-Abbas al-Kabeer al-Rifa'i. Furthermore, the user talked about the widespread support he receives from his followers and the key aspects of his method
On the hall-petch relationship in a nanostructured Al-Cu alloy
No full textMechanical properties of bulk nanocrystalline Al-4Cu alloys with grain sizes from 47 to 105 nm, synthesized by mechanically alloying followed by vacuum hot pressing at different temperatures, were analysed through Hall-Petch relation. Hall-Petch analysis revealed a high frictional stress (170 MPa) and a high positive slope (0.13 Mpa √m) as compared to pure Al, which has a frictional stress (15-30 MPa) and a slope (0.06-0.09 Mpa √m). From a detailed evaluation of different strengthening mechanisms it is inferred that the Al2Cu precipitates and oxide particles are the likely reason for such high values of frictional stress and slope
Ash-Shuo'a" the UNDIVIDED by Imam Omar Bin Abdulaziz Al-Boukhary in the Hanafi School
No full textThis research treating a study and investigation of the book titled "Ash-Shuo'a" THE UNDIVIDED by Imam Omar Bin Abdulaziz Al-Boukhary in the Hanafi school. It contains an Introduction and two chapters, the introduction displays the reasons for choosing the research title, it's important, the previous studies, its objectives, its methodology and the abstract. The first chapter: the theoretical contains two themes. The first identify the author, the second identify the investigated book. The second chapter: the investigation which includes the methodology followed in the investigation of manuscript, the photos and the investigation of the book. Finally, I have showed the most important results and recommendations. Also, I mentioned the index of resources and references used in study and investigation
Musical Instruments in Al-Jahiz
No full textفي كتابات الجاحظ، تناول أديب العرب الجاحظ قضايا الموسيقى والطرب والغناء. كان الجاحظ معروفًا بعلمه وأدبه، وكتب العديد من الأعمال التي تسلط الضوء على جوانب الحياة المترفة في المجتمع. كتب كتابًا بعنوان "أخلاق المغنين" وآخر بعنوان "المغنين والغناء والصنعة". في هذه الكتب، دافع الجاحظ عن الغناء كفن فني، ورأى أنه يمتلك قواعد وأسسًا علمية تشابه مع غيره من الفنون والآداب. كان يروج للغناء باعتباره متعة فنية. وعلى الرغم من انتمائه للمعتزلة، إلا أن الجاحظ كان مشجعًا للغناء ومغنين، وكتب عن أخلاقهم وفنونهم. وفي رسالته "القيان"، تناول الجاحظ تأثير بيوت القيان والقيان نفسهن في المجتمع الإسلامي، حيث أشار إلى الفسق والعشق والفجور الذي قد ينتج عن هذا التأثير. بشكل عام، تركت كتابات الجاحظ أثرًا مهمًا في فهمنا لثقافة الموسيقى والطرب والغناء في العصور القديمة.In his writings, the Arab author Al-Jahiz addressed issues related to music, Tarab (a genre of music), and singing. Al-Jahiz was known for his knowledge and literature, and he wrote numerous works that shed light on the luxurious aspects of society. He authored a book titled "Ethics of Singers" and another titled "Singers, Singing, and the Craft." In these books, Al-Jahiz defended singing as an artistic form and believed that it possessed scientific principles and foundations similar to other arts and literature. He promoted singing as a pleasurable art form. Despite his affiliation with the Mu\u27tazila school of thought, Al-Jahiz was a supporter of singing and singers, and he wrote about their ethics and arts. In his treatise "Al-Qiyan," Al-Jahiz discussed the influence of courtesans and their households on Islamic society, pointing to the immorality, passion, and vice that may result from this influence. Overall, Al-Jahiz\u27s writings have had a significant impact on our understanding of music, Tarab, and singing in ancient times
Theoretical Insights of History, Morality, and Society as the Literary Trio of the Author-Reader Relationship.
No full textThis paper attempts to examine the relationship between the author and the reader by polarizing history, morality, and society as a selected triad of theoretical interpretation. The study mainly focuses on the theoretical insights of these relationships in order to give proper clues for delving deep into the technical and thematic peculiarities of different literary genres. Therefore, it follows a qualitative approach to some fictional works, particularly novels, to demonstrate how the authorial perspective intersects with the reader’s ability to grasp the latent textual messages projected by authors in the course of the plots. The relationship between the author and the reader will be limited to three related topics, namely, history, morality, and society. As for history, the study sheds light on the postcolonial attributes of literature to reveal the function of liberal humanism in bridging the gap between the colonized people and the colonizers. Morality, on the other hand, will be discussed to explore the relative view of morality by authors and how the reader might conceptualize it according to his/her cultural background. Lastly, the discussion of society will be limited to the social customs and norms approached by authors to deliver a comprehensive depiction of the social reality in which the reader lives his/her true life
Inverse Hall Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon
No full textThe structural and mechanical stability of quasicrystals are important issues due to their potential for possible applications at high temperatures and stresses. The aim of the present work is, therefore, to review the earlier works on conventional crystalline and quasicrystalline materials and also to report the results and the analysis on the Hall Petch and inverse Hall Petch like behavior of nanoquasicrystalline Al62.5Cu25Fe12.5 alloys. It was observed that, at large grain sizes, the hardness increases with decreasing grain size, exhibiting the conventional Hall Petch relationship, whereas for smaller grains, inverse Hall Petch behavior was identified. The inverse Hall Fetch behavior in the nanoquasicrystalline phase could be attributed to thermally activated shearing of the grain boundaries, leading to grain boundary sliding in nanostructures of quasicrystalline grains. These results were analyzed based on the dislocation pile-up model as well as the grain boundary shearing models applicable to nanomaterials
Examining the Authorship of Nahj al-Balāgha: Between Ali Ibn Abi Talib, al-Sharif al-Radi, and al-Sharif al-Murtad
No full text"نهج البلاغة" كتاب يُنسَب إلى عليّ بن أبي طالب رضي الله عنه يتضمّن عددًا من الخطب والمواعظ والعهود والرّسائل والحِكَم والوصايا والآداب، توزّعت على 238 خطبة، و 79 رسالة و 489 قولا، يرى الشّيعة في "النّهج" أنّه أحد الكتب المهمّة الّتي يجب على الشّيعي قراءتها والأخذ والتعلّم منها، وقد اختلف الدّارسون والنّقّاد القدامى والمعاصرون في مؤلّـِفه، فمنهم مَن اعتبره لعليّ بن أبي طالب ومنهم من اعتبره للشّريف الرَّضيّ، وفريق ثالث جعله للشّريف المرتضى. تتناول هذه الدراسة بالاستقصاء والتحقّق والتحليل نسبة الكتاب إلى صاحبه أو ما يُزيل الإبهام، هل هو عليّ بن أبي طالب؟ أم الشّريف الرَّضيّ؟ أم الشّريف المرتضى؟ ويحاول أن يرجّح لمن يُنسَب كتاب نهج البلاغة، وما مدى مصداقيـّته؟ وما مدى صحّة نسبة كتاب نهج البلاغة لعليّ، وما رأي الدّارسين والعلماء فيه؟ وما هي أهمّ المطاعن الموجّهة إلى نهج البلاغة؟The book Nahj al-Balagha is a collection of sermons, letters, adages, commandments, and etiquettes, divided into 238 sermons, 79 treatises, and 489 sayings. People following the Shiite sect regard it as a crucial text for teaching and learning, and they attribute it to Ali Ibn Abi Talib. Yet, the book’s real author is still disputed among Sharia scholars. While some attribute it to Ali Ibn Abi Talib, others claim that al-Sharif al-Radi is the book’s actual author, whereas another group attribute it to al-Sharif al-Murtada. This study employs a comprehensive approach to investigate and analyze the book’s authorship. It involves a detailed literary and historical analysis, examining primary sources, scholarly works, and critical literature to explore the real author of the text. It compares the content of the book with other authenticated works belonging to the potential authors in order to identify similarities and differences. By evaluating the style, language, and themes of Nahj al-Balagha, as well as reviewing historical documents and manuscripts, the study aims to trace the text’s origins and transmissions. In doing so, it addresses the significant critiques and controversies surrounding the text, enhancing our understanding of its historical and literary significance. The study further contributes to the ongoing discourse on the book’s authorship, providing more clarity on the topic and promoting additional scholarly research
Kitab fima yahtaju ilayhi al-sani min a'mal al-handasa
No full textpage, folios 34 & 35 showing text and geometric figure
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