نتایج جستجو برای: power law

تعداد نتایج: 622523  

Journal: :Monthly Notices of the Royal Astronomical Society 1994

Journal: :SSRN Electronic Journal 2017

Journal: :Physical Review E 2018

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2001
R B Azevedo A M Leroi

Darwin observed that multiple, lowly organized, rudimentary, or exaggerated structures show increased relative variability. However, the cellular basis for these laws has never been investigated. Some animals, such as the nematode Caenorhabditis elegans, are famous for having organs that possess the same number of cells in all individuals, a property known as eutely. But for most multicellular ...

2009
Yihua He Georgos Siganos Michalis Faloutsos

4 Power-Laws of the Internet 8 4.1 Rank power-law . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.2 Degree power-law . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.3 Eigen power-law . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.4 The doubts and settlement . . . . . . . . . . . . . . . . . . . . . 12 4.5 Network analysis before power-laws . . . . . . . . . . ...

2011
Bryan Kelly

I propose a new measure of common, time-varying tail risk for large cross sections of stock returns. Stock return tails are described by a power law in which the power law exponent is allowed to transition smoothly through time as a function of recent data. It is motivated by asset pricing theory and is estimable via quasi-maximum likelihood. Estimates indicate substantial time variation in sto...

2016
STEPHEN M. BURROUGHS SARAH F. TEBBENS S. F. Tebbens

Power law cumulative number-size distributions are widely used to describe the scaling properties of data sets and to establish scale invariance. We derive the relationships between the scaling exponents of non-cumulative and cumulative number-size distributions for linearly binned and logarithmically binned data. Cumulative number-size distributions for data sets of many natural phenomena exhi...

B. Ramana G. Sarojamma

The combined effect of non-Newtonian rheology and irreversible boundary reaction on dispersion in a Herschel-Bulkley fluid through a conduit (pipe/channel) is studied by using generalized dispersion model. The study explains the development of dispersive transport following the injection of a tracer in terms of three effective transport coefficients namely exchange, convective and dispersion co...

M Jabbari, M Meshkini M.R Eslami

In this paper, the general solution of steady-state two-dimensional non-axisymmetric mechanical and thermal stresses and mechanical displacements of a hollow thick cylinder made of fluid-saturated functionally graded porous material (FGPM) is presented. The general form of thermal and mechanical boundary conditions is considered on the inside and outside surfaces. A direct method is used to sol...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت دبیر شهید رجایی - دانشکده مهندسی مکانیک 1391

در تحقیق حاضر رفتار خزش فروروندگی آلیاژهای mg-si (mg-0.5si,mg-0.8si.mg-1.23si) در محدوده دمایی 125 تا 218 درجه سانتیگراد و تحت تنش های نرماله 0/007 تا 0/018 مورد بررسی قرار گرفته است. همچنین عنصر بیسموت برای اصلاح ترکیب mg2si حاصل به مقدار 0/4% به تمامی آلیاژها اضافه شد. بررسی های صورت گرفته نشان می دهدکه با اضافه شدن درصد سیلیسیم در آلیاژهای مورد مطالعه mg-si نرخ های خزش حالت پایدار کاهش یافته...

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