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PhD theses : Science: Recent submissions
Now showing items 1-20 of 647
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(Sudan University of Science & Technology, 2022-07-25)We obtain the spectrum and an effective estimate for the Lebesgue measure of the preimages of iterates of Farey and Gauss maps. The intervals and dichotomy between Farey fractions and sequence in the limit of infinite level ...
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(Sudan University of Science & Technology, 2023-01-19)In this thesis, we study a derivative-free trust-region algorithm for large-scale unconstrained optimization, using symmetric-rank1 (SR1) to update the Hessian at every iteration. The centeral finite-difference iterations ...
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(Sudan University of Science & Technology, 2022-06-28)Nano science represents one of the most popular powerful tools for controlling and changing the physical properties of matter. It is now widely used in many applications. One of the most popular known one is the field of ...
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(Sudan University of Science & Technology, 2023-01-12)The thermal properties are a primary indicator in the development of energy efficient heat transfer fluids that is required in numerous industry sectors. Recently nanofluid was introduced into the heat fluids to enhance ...
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(Sudan University of Science & Technology, 2022-08-30)We show the analysis of orthogonality Fourier frequencies and orbits in affine iterated function systems. We characterize the Fourier frames for the Cantor-4set, of absolutely continuous measures and for singular measures ...
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(جامعة السودان للعلوم والتكنولوجيا, 2022-11-19)تعتبر الأرقام القياسية من أهم المقاييس الإحصائية المستخدمة فى الدراسات الاقتصادية والتخطيطية، الأرقام القياسية هى مؤشرات إحصائية تستخدم لقياس تغيرات الظواهر، يعتبر الرقم القياسي لأسعار المستهلكين من أهم الأرقام القياسية ...
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(Sudan University of Science & Technology, 2023-02-22)The energy problem is one of the long standing problems facing civilization. This problem can be solved mainly using solar cells. Unfortunately, these cells suffer from their low efficiency. To solve this problem many solar ...
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(Sudan University of Science and Technology, 2022-04-02)Quantitative Structure-activity relationship (QSAR) study was carried out using ACD/lab and MOE software’s, for developing a correlation between the structural properties of acridinedione and polyhydroquinoline derivatives ...
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(Sudan University of Science and Technology, 2022-03-02)The aim of the study is to evaluate the amount of rare earth and rare elements in Albir mining area , which located about 84 km southWadi Halfa on Northern Sudan. Because of the great geological diversity of elements ...
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(Sudan University of Science & Technology, 2022-09-27)This study aims to study the scattering theory using the Generalized Special Relativistic and some basic quantity equations, where it was found the scattering cross-section contains a new limit in which the cross section ...
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(جامعة السودان للعلوم والتكنولوجيا, 2021-12-26)هدفت الدراسة إلى إختيار أفضل نموذج بين نموذجى الإنحدار الذاتي ذو الفجوات الموزعة الخطي ARDL والإنحدار الذاتي ذو الفجوات الموزعة غير الخطي NARDL للتكامل المشترك لتحليل وقياس العلاقة بين الصادرات والواردات وتحويلات السودانيين ...
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(Sudan University of Science and Technology, 2022-09-21)The optical and electronic properties of four conjugated organic molecules, Indigo, Alizarin, Emodin and Purpurin, as potential organic solar cells were studied theoretically. The electronic properties, reorganization ...
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(Sudan University of Science and Technology, 2022-12-20)Five samples of Nix AL 2(1-x) and five other samples of NixS1-x O4 were prepared to be used as solar cell. The aim of this work is to characterize these films to see how there can used as solar cells. The crystal and ...
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(Sudan University of Science & Technology, 2022-04-22)A series of Ni\SiO2 catalysts were synthesized by heating different Concentration of NiCl2 impregnation SiO2 (at load 1 %, 3%, 5 % 8 % and 10%, respectively) at 110, 300, and 500 C The nature of surface species upon drying, ...
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(Sudan University of Science & Technology, 2022-04-01)Five medicinal plants widely used in Sudanese system of traditional medicine have been investigated for constituents by GC-MS analysis. The oils from these plant species have been extracted by maceration and their ...
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(Sudan University of Science & Technology, 2022-10-01)The Schiff base of benzidinedioxime was synthesized by the condensation reaction of benzidine with diacetylmonoxime in acid media. The chemical structure, electronic properties, and crystal structure of benzidinedioxime ...
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(Sudan University of Science and Technology, 2022-06-01)Several quinoline derivatives have an important role in the biological activities field. This importance leads to investigate of newly designed and synthesized of quinoline derivatives against mycobacterium tuberculosis ...
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(Sudan University of Science & Technology, 2022-10-01)Zeolite have been used for removal of heavy metals in many application in different fields such as agriculture, industry and medicine The present work aimed to test the efficiency of natural zeolite collected from Gadaref ...
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(Sudan University of Science & Technology, 2022-08-01)This research was designed to study the seed oils of five potential medicinal plants. (Carum carvi, Coriandrum sativum, Hibiscus sabdariffa )grown in Egypt(; Nerium oleander, Lagenaria siceraria)grown in Sudan). The ...
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(Sudan University of Science & Technology, 2022-08-10)There is a clear interest in recent years to determine the concentrations of radioactive, toxic and heavy elements in the soil of areas of traditional mining, and find out if these concentrations are within the safe limit ...
Now showing items 1-20 of 647
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