نتایج جستجو برای: secular

تعداد نتایج: 8750  

2008
John Kormendy

Updating Kormendy & Kennicutt (2004, ARA&A, 42, 603), we review internal secular evolution of galaxy disks. One consequence is the growth of pseudobulges that often are mistaken for true (merger-built) bulges. Many pseudobulges are recognizable as cold, rapidly rotating, disky structures. Bulges have Sérsic function brightness profiles with index n > ∼ 2 while most pseudobulges have n < ∼ 2. Re...

Journal: :The Journal of chemical physics 2015
Brian R Landry Joseph E Subotnik

We evaluate the accuracy of Tully's surface hopping algorithm for the spin-boson model in the limit of small to moderate reorganization energy. We calculate transition rates between diabatic surfaces in the exciton basis and compare against exact results from the hierarchical equations of motion; we also compare against approximate rates from the secular Redfield equation and Ehrenfest dynamics...

2016
Alessandra Celletti Cătălin B. Galeş

The dynamics of small bodies around the Earth has gained a renewed interest, since the awareness of the problems that space debris can cause in the nearby future. A relevant role in space debris is played by lunisolar secular resonances, which might contribute to an increase of the orbital elements, typically of the eccentricity. We concentrate our attention on the lunisolar secular resonance d...

Journal: :Philosophy, Ethics, and Humanities in Medicine 2006
Thomas Szasz

The Council for Secular Humanism identifies Secular Humanism as a "way of thinking and living" committed to rejecting authoritarian beliefs and embracing "individual freedom and responsibility ... and cooperation." The paradigmatic practices of psychiatry are civil commitment and insanity defense, that is, depriving innocent persons of liberty and excusing guilty persons of their crimes: the co...

2006
Fred C. Adams Gregory Laughlin

This paper considers general relativistic (GR) effects in currently observed extrasolar planetary systems. Although GR corrections are small, they can compete with secular interactions in these systems and thereby play an important role. Specifically, some of the observed multiple planet systems are close to secular resonance, where the dynamics is extremely sensitive to GR corrections, and the...

Journal: :Mathematics and Computers in Simulation 2013
M. Sansottera U. Locatelli A. Giorgilli

We investigate the long time stability of the Sun–Jupiter–Saturn–Uranus system by considering the planar, secular model. Our ethod may be considered as an extension of Lagrange’s theory for the secular motions. Indeed, concerning the planetary orbital evolutions, we improve the classical circular approximation by replacing it with a torus which is invariant up to order two in he masses; therefo...

2014
Hadia Hassan Selim H. H. Selim

Coupling effects of Earth oblateness and direct solar radiation pressure on the motion of an artificial satellite are evaluated. Secular and periodic terms are retained up to order three and two respectively, where the coefficient 2 J of the second zonal harmonic of the geopotential is considered of first order. The solution revealed the existence of secular terms at order three that arises fro...

Journal: :Christian bioethics 2000
T J Bole

The following demarcates the sens of the human person in Orthodox-Catholic bioethics from the family of senses proper to secular bioethics and philosophy. The radically different sources of knowledge about the senses proper to each discipline suggest that the importation of philosophical and secular psychological distinctions and analyses into true Christianity's concern with the human person, ...

G. Partap, R. Kumar,

In present study is concerned with the propagation of axisymmetric vibrations in a homogenous isotropic micropolar thermoelastic cubic crystal plate bordered with layers or half spaces of inviscid liquid subjected to stress free boundary conditions in context of Lord and Shulman (L-S) and Green and Lindsay (G-L) theories of thermoelasticity. The secular equations for symmetric and skew-symmetri...

Journal: :J. Comb. Theory, Ser. A 2006
Peter J. Forrester Alexander Gamburd

Abstract: Moments of secular and inverse secular coefficients, averaged over random matrices from classical groups, are related to the enumeration of non-negative matrices with prescribed row and column sums. Similar random matrix averages are related to certain configurations of vicious random walkers and to the enumeration of plane partitions. The combinatorial meaning of the average of the c...

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