100,833 research outputs found
An evaluation of the Rouse theory for the suspension of sand in a tidal inlet
No full textThe Rouse theory for the suspension of sand in the Oka estuary has been evaluated. The Rouse profile, which is often used to represent the vertical distribution of sand in suspension, is a function of the ratio of the sediment fall velocity to bed friction velocity. This ratio, ws/u*, varied with height above the bed, as it is dependent on grain diameter. The grain size of sampled suspended sand was finer near the surface and coarser near the bed. This was evident at the three anchor stations occupied at the Oka estuary, where the field work was carried out. The values of the Rouse parameter showed that the sand transport in suspension took place throughout the benthic boundary layer. The suspension threshold of Bagnold (1966) was found to discriminate accurately between bedload and suspended load. The critical Shields parameter for suspension of sand, derived from the field measurements, defines the suspension threshold better when the friction velocity is assumed constant. Laboratory work carried out to evaluate the vertical distribution of the friction velocity throughout the benthic boundary layer result in a constant distribution with height above the bed in the lower 10%. This supports the assumption made in the Rouse theory. The sand concentration profile is more complex than just Roussian, as three layers have been recognized: a Roussian layer; a buffer layer; and an inner layer. The majority (90%) of the mass flux of sand took place within the inner layer. The concentration in this layer is characterized by an exponential increase towards the bed. This profile was not asymptotic to the normally accepted bed concentration (0.65). A new simplified equation to predict sand concentration in the inner layer was generated whereby: , where z is height above bed and h is water depth. The reference concentration, Ca, of the Rouse profile is predicted using the inner layer equation and solving at the upper limit of the inner layer (z/h = 0.1). The concentration gradient and magnitude (at a given height) were not related to shear stress or near bed flow velocity. Therefore, it is recommended that a near-bed measurement be used to define concentration at the bed, a, from which the concentration profile may be constructed
An evaluation of the Rouse theory for sand transport in the Oka estuary, Spain
No full textThe Rouse profile has been traditionally used to represent the vertical distribution of suspended sand in a marine benthic boundary layer. Yet it is one of the biggest unknowns in estuarine morphodynamics, largely due to uncertainties of the ratio of the sediment fall velocity to bed friction on which the Rouse exponent (R=ws/?ku?) is based. A field campaign was carried out at three different locations in the Oka estuary, northern Spain, in order to examine these uncertainties. Each location differed in grain size and flow condition thus offering a wide range of settings. The first survey was inside the estuary (wave sheltered, flood tide dominated and relatively broad estuary section), the second was at the distal ebb delta (ebb tide dominated and narrow estuary section), and the third was over the wave exposed proximal ebb delta (wave/flood tidal current combined flows and open sea). The aim of this study is to evaluate the applicability of the Rouse (1937) theory for the distribution of sand in suspension throughout a turbulent benthic boundary layer. A modified version of a Helley–Smith sampler was used to trap sand and measure the vertical distribution of sand in the water column. As well, a 1200 ADCP was used to measure flow velocity and backscatter together with an ADV (turbulence). The sand traps were found to have a sampling efficiency of 44%. The grain size at all stations was finer near the surface and coarser near the bed. The sand transport inside the estuary (Station 1) is inwards dominant. By contrast, the sand concentration during the ebb tide was ten times higher than during the flood tide at Station 2 and even higher at Station 3, which suggests that the sand transport over the ebb delta is seawards. The average Rouse parameters for Stations 1, 2, and 3 are 0.48±0.035, 0.78±0.23, and 0.46±0.06 respectively, which correspond to a coefficient of proportionality of the movability number, (?) of 4 ( Van Rijn, 1993). These differ from previous findings of Villatoro et al. (2010) and Amos et al. (2010b)
SME Funds as Vehicles of Economic Reform in Kuwait and the GCC
Get PDFKuwait’s economy has been stagnant over the past decade due to political instability, fluctuating oil prices, and endemic corruption. To combat this situation, Kuwait has attempted to develop a robust business sector through fundamental policy shifts away from monopolies and toward the creation of small- and medium-sized enterprises (SMEs). Alanoud Al Sharekh explores Kuwaiti SME development in an issue brief and a longer research paper, which are part of a series on pluralism and inclusion in the Middle East after the Arab Spring. The project is generously supported by a grant from the Carnegie Corporation of New York
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
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
Get PDFفي 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
Depersonalization: Deconstructing Eliot’s Notion in The Waste Land
Get PDFThrough a re-reading and a reassessment of Thomas Stearns Eliot’s (1888–1965) masterpiece The Waste Land (1922), the present paper aims at recycling the poem with new polysemy. By using specific methods of the psychoanalytic approach, this study demonstrates that many details about the text and its context are marginalized if read through the objective protocols of Eliot/the New Critics. Thus, the present paper is devoted to re-reading the text subjectively to deconstruct Eliot\u27s “impersonal theory” in catering efficiently for the author’s presence. The conclusion will prove that the text is highly charged with personal tones, and consequently deviates from his theory of “Depersonalization,” thereby proving an authorial presence
Dynamic risk spillovers and portfolio risk management between precious metals and global foreign exchange markets
Get PDFThis study examines portfolio management and risk spillovers between four major precious metals (gold, silver, palladium and platinum) and 20 important U.S. exchange markets. To this end, we employ the multivariate DECO-GARCH model and the spillover index developed by Diebold and Yilmaz (2014, 2016) to examine the spillovers between those metal prices and the exchange rates and design portfolios and hedging strategies using different risk measures. The results show evidence of weak average conditional equicorrelations among the considered markets over time, excluding the turbulent 2008–2010 period. Furthermore, the precious metals (excluding platinum) and the currencies (with the exception of the Australian, Brazilian, Denmark, Euro, Mexican, Norwegian, New Zealand and Swedish currencies) are net receivers of shocks. Finally, the four precious metals provide strong risk and downside risk reductions, underscoring the usefulness of including precious metals in a traditional foreign exchange-dominated portfolio.The fourth author (Alanoud Ali S A Al-Maadid) acknowledges the financial support by Qatar University internal research grant [QUCP-CBE-2018-1]. The last author (Sang Hoon Kang) acknowledges the financial support by the Ministry of Education of the Republic of Korea and the National Research Foundation of Korea (NRF-2017S1A5B8057488)
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