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Register a new userStability and instability of small motions of a pendulum with a cavity filled with a system of ideal capillary fluids
استقرار وعدم استقرار الحركات الصغيرة لنواس ذي تجويف مملوء بمجموعة سوائل شعرية مثالية
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وديع علي( باحث )
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الهدف من هذا البحث هو دراسة المسألة الطيفية للحركات الصغيرة لنواس ذي تجويف مملوء بمجموعة من السوائل الشعرية المثالية عندما يتحقق شرط الاستقرار بالتقريب الخطي. فقد تم البرهان على أن لهذه المسألة طيفاً حقيقياً متقطّعاً له نقطة تراكم عند وأن القيم الخاصة لهذه المسألة هي نهايات صغرى متتالية لنسب متغيرة، كما تم البرهان على أنه إذا كان لمؤثر الطاقة الكامنة لجملة ( نواس + مجموعة سوائل شعرية مثالية ) قيمة خاصة سالبة فإن حلول المسألة الحدية الابتدائية لهذه الجملة غير مستقرة.
The aim of this paper is to study the spectral problem of small motions of a pendulum with a cavity filled with a system of ideal capillary fluids when the condition of statically stable in linear approximation is valid. It is proved that this problem has a real discrete spectrum with a limit point at and the eigenvalues for this problem are successive minima of variation ratio. It is also proved that if the operator of potential energy of a system ( pendulum + a system of ideal capillary fluids )has a negative eigenvalues, then the solutions of the initial boundary value problem are instable
References used
KOPACHEVSKY,N.D; KREIN,S.G; NGO ZUY CAN. Operators Methods in Linear Hydrodynamics:Evolution and Spectral Problem.Nauka,Moscow,1989,159-181
MYSHKIS, A. D; BABSKII, V.G; ZHUKOV, M.Y; KOPACHEVSKII,N.D; SLOBOZHANIN,L.A; TYUPTSOV, A.D; Methods of Weightlessness Hydromechanics Naukova Dumka, Kiev , 1992, 261-316
KOPACHEVSKY,N.D; KREIN,S.G .Operator Approach in Linear Problems of Hydrodynamics Vol. 1: Self-adjoint Problems for Ideal Fluid, Birkh¨auserVerlag, Basel—Boston—Berlin, 2001,383
KOPACHEVSKY,N.D; KREIN,S.G. Operator Approach in Linear Problems of Hydrodynamics.Vol. 2: Nonself-adjoint Problems for Viscous Fluids, Birkh¨auserVerlag, Basel—Boston—Berlin, 2003, 444
KOPACHEVSKY, N.D;On oscillation of a body with a cavity partially filled withheav ideal fluid: Theorems of existence , uniqueness and stability of strong solutions, Zb.prac.Inst.mat.NANUkr, Kyiv, Vol .2,no.1,2005,158-194
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تتضمن الرسالة أربعة فصول :
الفصل الأول : ويتضمن بعض المفاهيم والتعاريف والمبرهنات التي تتعلق بالبحث.
الفصل الثاني : دراسة استقرار جملة معادلات تفاضلية خطية لا توقفيه ذات تأخير زمني .
الفصل الثالث :دراسة استقرار حل جملة المعادلات التفاضلية الخطية
ذات تأخير زمني .
الفصل الرابع : دراسة استقرار حل المعادلات التفاضلية لا توقفية ذات تأخر زمني باستخدام نظرية النقطة الثابتة
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