نتایج جستجو برای: gravity

تعداد نتایج: 62883  

Chegini , Nabiollah, Kiani Shahvandi, Mostafa , Nazari, Borzoo , Safari , Abdolreza ,

In this paper, a method is proposed for producing gravity acceleration at sea surface in the Persian Gulf. This method is based on the Geoid height from satellite altimetry, high resolution Geopotential models, and ellipsoidal splines. First, the definition of the ellipsoidal spline functions is presented in a Hilbert space, which is consisted of infinitely often differentiable functions. In or...

Journal: :British medical journal 1983
M Ryan

area display a striking variety. Ignoring many important differences among Western countries, Soviet orthodoxy reduces the variation to a crude dichotomy between "capitalist" and "socialist" political systems. Taking the United States as a paradigm, it indicts "capitalist" states as the home of malpractice suits and (so far as I know) completely disregards statutory schemes for review of compla...

2005
TOM WESTON

In fact, we suspect that much more is true: we conjecture that this relative density does not change after restriction to any set of primes defined by a Cebatorevstyle Frobenius condition; that is, we expect that the sets (0.1) yield sets of primes of positive density which are quite different from those sets determined by Galois theoretic conditions. See Conjecture 1.2 for a precise statement....

2008
Olindo Corradini Kazuya Koyama

We explore cosmology of intersecting braneworlds with induced gravity on the branes. We find the cosmological equations that control the evolution of a moving codimension one brane and a codimension two brane that sits at the intersection. We study the Friedmann equation at the intersection, finding new contributions from the six dimensional bulk. These higher dimensional contributions allow us...

2004
Yeuk-Kwan E. Cheung Mark Laidlaw Konstantin Savvidy

We present a new application of Boundary String Field Theory: calculating the induced-gravity action on a D-brane. Using a simple quadratic tachyon potential to model a D-brane fluctuating in the flat target space we derive the effective action in terms of the extrinsic curvature to all orders in α′. We identify both the Born-Infeld structure as well as the Einstein-Hilbert term at order α′. Th...

Journal: :فیزیک زمین و فضا 0
عبدالرحیم عسکری استادیار، دانشگاه تربیت معلم سبزوار وحید ابراهیم زاده اردستانی دانشیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران و قطب علمی مهندسی نقشه برداری و مقابله با سوانح طبیعی علیرضا آزموده اردلان استاد، گروه مهندسی نقشه برداری، قطب علمی مهندسی نقشه برداری در مقابله با سوانح طبیعی، پردیس دانشکده های فنی

measuring field gravity in sea due to the accelerations introduced via waves and movements to the gravity measuring systems has a low accuracy since according to einstein's equalent principle, gravimeter isn't able to separate the gravity acceleration from another acceleration. ship borne gravimetery observations by means of like oscillations and accelerations of the ship motion, and ...

2008
S. Calchi Novati S. Capozziello G. Lambiase

We discuss the weak-field limit of induced gravity and show that results directly depend on the coupling and self–interaction potential of the scalar field. A static spherically symmetric exact solution is found and its conformal properties are studied. As an application, it is shown that the light deflection angle and the microlensing quantities can be parametrized by the coupling of the theory.

ژورنال: فیزیک زمین و فضا 2015

One of the main goals of interpretation of gravity data is to detect location and edges of the anomalies. Edge detection of gravity anomalies is carried out by different methods. Terracing of the data is one of the approaches that help the interpreter to achieve appropriate results of edge detection. This goal becomes a complex task when the gravity anomalies have smooth borders due to gradual ...

A. Akbarpour , H. Chiti, H. R. Naseri, M. Khatibinia,

This study focuses on the shape optimization of concrete gravity dams considering dam–water–foundation interaction and nonlinear effects subject to earthquake. The concrete gravity dam is considered as a two–dimensional structure involving the geometry and material nonlinearity effects. For the description of the nonlinear behavior of concrete material under earthquake loads, the Drucker–Prager...

Journal: :فیزیک زمین و فضا 0
عبدالرحیم عسکری وحید ابراهیم زاده اردستانی علیرضا آزموده اردلان

changing altimetry information from satellites on the surface of seas and oceans, into anomaly gravity for example free air anomaly, is a fundamentally new method presented by researches. the determination of the free air gravity anomaly over the earth’s marine regions has led to a major improvement in our understanding of plate tectonic processes relating to oceanic ridges, the formation of ma...

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