نتایج جستجو برای: mass center eccentricity

تعداد نتایج: 745981  

1998
Jean-Marc Petit Alessandro Morbidelli Giovanni B. Valsecchi

We study the dynamical excitation that large planetesimals, scattered either by Neptune or Jupiter, could have provided to the primordial Edgeworth–Kuiper belt and the asteroid belt. Using both a refined Monte Carlo approach and direct numerical integration, we show that the Monte Carlo method is useful only to give qualitative insight into the resulting excitation, but cannot be trusted from a...

Journal: :The Astrophysical Journal 2022

Abstract Mechanisms have been proposed to enhance the merger rate of stellar-mass black hole binaries, such as Von Zeipel–Lidov–Kozai mechanism (vZLK). However, high inclinations are required in order greatly excite eccentricity and reduce time through vZLK. Here, we propose a novel pathway which compact binaries could merge due increase general, including near coplanar configuration. Specifica...

Journal: :پژوهشنامه تاریخ تمدن اسلامی 0
سید محمد مظفّری عضو هیأت علمی مرکز تحقیقات نجوم و اخترفیزیک مراغه

introducing three principal methods of determining the solar orbital eccentricity in the ancient and medieval astronomy (i.e., the method of seasons, of mid-signs, of three–points), the accuracy of the results obtained from each is being investigated. in doing so, two main goals have been targeted: (1) to determine the accuracy and the intrinsic limitation of each method with regard to their st...

Journal: :Water 2022

To estimate the influence of rotation center eccentricity single-blade centrifugal pump impeller on radial force it, and to explore effective balance method, a single blade with power 2.2 kW is analyzed. The accuracy Numerical Simulation Methods are verified by tests external characteristics (under three rotation-speeds 1470 r/min, 2000 2940 r/min) pressure distributions. There five models diff...

Journal: :Visual neuroscience 2004
N R A Parry S Plainis I J Murray D J McKeefry

To investigate the effect of foveal inhomogeneities on sensitivity to chromatic stimuli, we measured simple reaction times (RTs) and detection thresholds to temporally and spatially blurred isoluminant stimuli at retinal eccentricities from 0 deg to 8 deg. Three color-normal subjects participated. Contrast gain was derived from the slope of the RT versus contrast function. With a Gaussian spati...

Journal: :Vision Research 1997
DAVID WHITAKER KEZIAH LATHAM

Factors underlying Weber's law for position were investigated by measuring spatial interval discrimination accuracy for spectrally narrow-band stimuli. These stimuli were positioned around an iso-eccentric arc in order to allow separation and eccentricity to be varied independently. We find that Weber's law occurs at individual spatial scales, and holds true not just for stimuli positioned eith...

Journal: :Hearing research 2010
Denise N Gabriel Douglas P Munoz Susan E Boehnke

Although much is understood about the stimulus properties affecting the latency of saccadic eye movements to visual targets, relatively little is known about the properties affecting saccades to auditory targets. This study examined the effect of three primary acoustic features-frequency, intensity, and spatial location-on auditory saccade characteristics in humans, and compared them to visual ...

2004
M D Melita J C B Papaloizou

We use a simple model of the dynamics of a narrow-eccentric ring, to put some constraints on some of the observable properties of the real systems. In this work we concentrate on the case of the 'Titan ringlet of Saturn'. Our approach is fluid-like, since our description is based on normal modes of oscillation rather than in individual particle orbits. Thus, the rigid precession of the ring is ...

Journal: :Discrete Mathematics 1996
Steven J. Winters

The eccentricity e(v) of a vertex v in a connected graph G is the distance between v and a vertex furthest from v in G. The center C(G) of G is the subgraph induced by those vertices of G having minimum eccentricity; the periphery P(G) is the subgraph induced by those vertices of G having maximum eccentricity. The distance d(v) of a vertex v in G is the sum of the distances from v to the vertic...

Journal: :Journal of vision 2012
Li Zhaoping

Where we look in visual tasks is determined by both bottom-up and top-down factors. One theory (Li, 1999a, 2002) suggests that visual area V1 creates a bottom-up saliency map, guiding gaze through extensive projections to the superior colliculus. V1 is the only visual cortical area that represents the eye of origin of an input and is also least associated with awareness; I therefore predicted t...

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