نتایج جستجو برای: maxwells equations

تعداد نتایج: 238697  

2015
T. A. Raybould V. A. Fedotov N. Papasimakis I. Youngs N. I. Zheludev

The propagation of electromagnetic radiation in free-space is described by the source-free Maxwells equations. In contrast to conventional solutions such as infinite-energy plane waves and Gaussian pulses, there exists a family of exact solutions which represent localised transmission of finite electromagnetic energy [1]. One such solution is known as the Focused Doughnut (FD) pulse a peculiar ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ولی عصر (عج) - رفسنجان - دانشکده ریاضی و کامپیوتر 1389

in this thesis we will present three topics. we define approximate fixed points in fuzzy normed spaces. also we obtain some necessary and sufficient conditions on the existence of? -fixed points for ? > 0. at the continue some results about approximate fixed points for a class of non-expansive maps on g-metric spaces are obtained and we define approximate fixed points in partial metric spa...

Journal: :iranian journal of science and technology (sciences) 2011
g. h. erjaee

in this article, we study the analytical solutions of different parabolic heat equations with different boundaryconditions in the form of multi-term fractional differential equations. then we compare these analytical solutions with numerical finite difference methods. this comparison demonstrates the accuracy of the analytical and numerical methods presented here.

Journal: :international journal of industrial mathematics 0
h. ‎rouhparvar‎ department of mathematics, college of technical and ‎engineering, saveh branch, islamic azad university, saveh, iran

this paper presents a class of theoretical and iterative method for linear partial differential equations. an algorithm and analytical solution with a initial condition is obtained using the reduced differential transform method. in this technique, the solution is calculated in the form of a series with easily computable components. there test modeling problems from mathematical mechanic, physi...

Journal: :نظریه تقریب و کاربرد های آن 0
m nikuei young researchers club, tabriz branch, islamic azad university, tabriz, iran. m.k. mirnia department of computer engineering, tabriz branch, islamic azad university, tabriz, iran.

the index of matrix a in cn.n is equivalent to the dimension of largest jor-dan block corresponding to the zero eigenvalue of a. in this paper, indicialequations and normal equations for solving inconsistent singular linear systemof equations are investigated.

Journal: :international journal of nonlinear analysis and applications 0
javad damirchi department of mathematics, faculty of mathematics, statistics and computer science, semnan university,semnan, iran

in this paper, we prove the existence and uniqueness results to the random fractional functional differential equations under assumptions more general than the lipschitz type condition. moreover, the distance between exact solution and appropriate solution, and the existence extremal solution of the problem is also considered.

Journal: :computational methods for differential equations 0
ahmad neirameh department of mathematics,gonbad university

solitary wave solutions to the broer-kaup equations and approximate long water wave equa-tions are considered challenging by using the rst integral method.the exact solutions obtainedduring the present investigation are new. this method can be applied to nonintegrable equa-tions as well as to integrable ones.

Journal: :journal of linear and topological algebra (jlta) 0
l jamshidi department of mathematics, hamedan branch, islamic azad university, hamedan, iran. t allahviranloo department of mathematics, tehran science and research branch, islamic azad university, tehran , iran.

in this paper, we study rst order linear fuzzy di erential equations with fuzzy coecient and initial value. we use the generalized di erentiability concept and apply the exponent matrix to present the general form of their solutions. finally, one example is given to illustrate our results.

Journal: :international journal of information, security and systems management 2015
elnaz poorfattah akbar jafari shaerlar

in this paper, an effective numerical method is introduced for the treatment of nonlinear two-dimensional volterra-fredholm integro-differential equations. here, we use the so-called two-dimensional block-pulse functions.first, the two-dimensional block-pulse operational matrix of integration and differentiation has been presented. then, by using this matrices, the nonlinear two-dimensional vol...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت دبیر شهید رجایی 1390

دراین پایان نامه نظر به اهمیت معادلات انتگرال ولترای خطی در حل مسائل فیزیک ،مهندسی و ... ، روش های کالوکیشن و کالوکیشن تکراری جهت حل معادلات انتگرال ولترای منفرد ضعیف مورد بررسی قرار می گیرند . سپس در ادامه در موردهمگرایی این روشها مطالب مفیدی بیان خواهد شد . در پایان نتیجه میگیریم که اگر جواب دقیق در برخی از فضاهای مناسب وجود داشته باشد ، با استفاده از این روش یک همگرایی قوی میتواند بوجود بیای...

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