نتایج جستجو برای: inverse multiquadric function imf

تعداد نتایج: 1291606  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بناب - دانشکده علوم پایه 1393

در این پایان نامه روش عددی جدید مطرح شده برای معادله ی برگر و برگر- هوکسلی با استفاده از تابع پایه ای شعاعی مالتی کووادریک برای تقریب فضایی و مرتبه ی دوم طرح تفاضل متناهی فشرده بکار گرفته شده است.

2010
M. D. BUHMANN

In this paper, we identify univariate prewavelets on spaces spanned by translates of multiquadric functions and other radial basis functions with nonequally spaced centers (or "knots"). Although the multiquadric function and its relations are our prime examples, the theory is sufficiently broad to admit prewavelets from other radial basis function spaces as well.

2014
Jeff Ledford JEFF LEDFORD

This note concerns density properties of the general multiquadric, (x + c2)k−1/2, where k is a fixed natural number. We establish that scattered translates of the general multiquadric are dense in C([a, b]), where a and b are finite. As a corollary, we show that scattered translated of the general multiquadric are dense in the function spaces L([a, b]), for 1 ≤ p <∞.

Journal: :SIAM J. Scientific Computing 2002
Jon B. Cherrie Richard K. Beatson Garry N. Newsam

A generalised multiquadric radial basis function is a function of the form s(x) = ∑N i=1 diφ(|x − ti|), where φ(r) = ( r2 + τ2 )k/2 , x ∈ Rn, and k ∈ Z is odd. The direct evaluation of an N centre generalised multiquadric radial basis function at m points requires O(mN) flops, which is prohibitive when m and N are large. Similar considerations apparently rule out fitting an interpolating N cent...

Journal: :International Journal of Engineering and Technology 2014

Journal: :Computers & Mathematics with Applications 2006

Journal: :J. Applied Mathematics 2012
Mohammad Mehdi Mazarei Azim Aminataei

This paper presents numerical solution of elliptic partial differential equations Poisson’s equation using a combination of logarithmic and multiquadric radial basis function networks. This method uses a special combination between logarithmic and multiquadric radial basis functions with a parameter r. Further, the condition number which arises in the process is discussed, and a comparison is m...

2006
OREN E. LIVNE GRADY B. WRIGHT

Abstract. Radial basis functions (RBFs) are a powerful tool for interpolating/approximating multidimensional scattered data. Notwithstanding, RBFs pose computational challenges, such as the efficient evaluation of an n-center RBF expansion at m points. A direct summation requires O(nm) operations. We present a new multilevel method whose cost is only O((n + m) ln(1/δ)), where δ is the desired a...

Journal: :محیط شناسی 0
علیرضا نورپور دانشیار گروه مهندسی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران سید محمد علی فیض دانشجوی کارشناسی ارشد مهندسی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران

introduction studies about the health effects of long-term average exposure to outdoor air pollution have played an important role in the recent health impact assessments. exposure assessment for epidemiological studies of long-term exposure to ambient air pollution remains a difficult challenge because of substantial small-scale spatial variation. current approaches for assessing intra-urban ai...

Journal: :Mathematics 2022

In this article, we propose a simplified radial basis function (RBF) method with exterior fictitious sources for solving elliptic boundary value problems (BVPs). Three RBFs, including Gaussian, multiquadric (MQ), and inverse (IMQ) without the shape parameter, are adopted in study. With consideration of many outside domain, distance RBF is always greater than zero, such that can remove parameter...

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