نتایج جستجو برای: s modulus

تعداد نتایج: 734892  

1998
K. Kopotun D. Leviatan Diane C. Myers

Let f ∈ C[−1, 1] change its convexity finitely many times in the interval, say s times, at Ys : −1 < y1 < · · · < ys < 1. We estimate the degree of approximation of f by polynomials of degree n, which change convexity exactly at the points Ys. We show that provided n is sufficiently large, depending on the location of the points Ys, the rate of approximation is estimated by the third Ditzian–To...

Journal: :Mathematical proceedings of the Cambridge Philosophical Society 2022

Given a singular modulus $j_0$ and set of rational primes $S$, we study the problem effectively determining moduli $j$ such that $j-j_0$ is an $S$-unit. For every $j_0 \neq 0$, provide effective way finding this for infinitely many choices $S$. The same true if $j_0=0$ assume Generalized Riemann Hypothesis. Certain numerical experiments will also lead to formulation "uniformity conjecture" $S$-...

Journal: :Math. Comput. 2004
Mark Watkins

Let χ be a real odd Dirichlet character of modulus d, and let L(s, χ) be the associated Dirichlet L-function. As a consequence of the work of Low and Purdy, it is known that if d ≤ 800 000 and d 6= 115 147, 357 819, 636 184, then L(s, χ) has no positive real zeros. By a simple extension of their ideas and the advantage of thirty years of advances in computational power, we are able to prove tha...

1994
Ian J.R. Aitchison Ping Ao David J. Thouless

We show that the low frequency, long wavelength dynamics of the phase of the pair field for a BCS-type s-wave superconductor at T=0 is equivalent to that of a time-dependent non-linear Schrödinger Lagrangian (TDNLSL), when terms required by Galilean invariance are included. If the modulus of the pair field is also allowed to vary, the system is equivalent to two coupled TDNLSL’s. PACS#s:74.20.-...

Journal: :Discrete Mathematics 1994
Aviezri S. Fraenkel H. Porta Kenneth B. Stolarsky

This paper studies divisibility properties of sequences defined inductively by n,=l, a n+1 =Sa,+tLea,], where s, t are integers, and 0 is a quadratic irrationality. Under appropriate hypotheses (especially that s + t0 be a PV-number) it is proved that the highest power of A that divides a,, where A is the discriminant of 19, tends to infinity. This is noteworthy in that truncation would normall...

In this research, the influence of adding micro- and nano- sized calcium carbonate powders to nylon-66 was investigated. Mechanical properties of micro and nano- composites, including tensile strength, elongation, and Young’s modulus, before and after ageing, were determined and analyzed. For this purpose, micro- and nano-sized CaCO3 particles were used as fillers to prepare micro-composites (c...

دشت بیاض, محمدرضا, محمودی میمند, مریم,

In this research, stiffness of polymer-clay nanocomposites was simulated by Mori-Tanaka and two and three dimensional finite element models. Nanoclays were dispersed into polymer matrix in two ways, namely parallel and random orientations toward loading direction. Effects of microstructural parameters including volume fraction of nanoclays, elastic modulus of nanoclays and interphase, thickness...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم ریاضی و مهندسی کامپیوتر 1388

چکیده ندارد.

Journal: :jundishapur journal of natural pharmaceutical products 0
motahare sadat sadat hosseini biomedical group, faculty of biomedical engineering (center of excellence), amirkabir university of technology, tehran, ir iran; polymer group, faculty of polymer engineering and color technology (center of excellence), amirkabir university of technology, ir iran mohammad tazzoli-shadpour biomedical group, faculty of biomedical engineering (center of excellence), amirkabir university of technology, tehran, ir iran issa amjadi biomedical group, faculty of biomedical engineering (center of excellence), amirkabir university of technology, tehran, ir iran nooshin haghighipour national cell bank of iran, pasteur institute of iran, ir iran mohammad ali ali shokrgozar national cell bank of iran, pasteur institute of iran, ir iran mehri ghafourian boroujerdnia nanotechnology research center, ahvaz jundishapur university of medical sciences, ir iran; immunology department, medical college,aolvo{nouogiomw{ wo{wersit{eovemdikwmzsk}onkwhapur university of medical sciences, ir iran +98-9161184882, [email protected]; immunology department, medical college,aolvo{nouogiomw{ wo{wersit{eovemdikwmzsk}onkwhapur university of medical sciences, ir iran +98-9161184882, [email protected]

background substrates in medical science are hydrophilic polymers undergoing volume expansion when exposed to culture medium that influenced on cell attachment. although crosslinking by chemical agents could reduce water uptake and promote mechanical properties, these networks would release crosslinking agents. in order to overcome this weakness, silicone rubber is used and reinforced by nanocl...

Journal: :iranian journal of science and technology (sciences) 2015
s. dadras

in this work we simulated the representative volume element (rve) of carbon nanotube (cnt) which is surrounded by high temperature superconductor (ybco) by using ansys finite element software. first we considered perfect model (for ybco and cnt) and investigated the effect of radius, length, and the number of nanotube in young’s modulus of the ybco by applying force on rve. then, a third region...

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