搜索结果: 61-75 共查到“知识库 天体力学”相关记录128条 . 查询时间(3.631 秒)
A New Artificial Dielectric Metamaterial and its Application as a THz Anti-Reflection Coating
Artificial Dielectric Metamaterial Application THz Anti-Reflection Coating
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2011/10/11
We describe a novel artificial dielectric material which has applications at millimetre and submillimetre wavelengths. The material is manufactured from layers of metal mesh patterned onto thin polypr...
Magnetic field evolution in interacting galaxies
Galaxies: general – galaxies: magnetic fi elds – galaxies: interactions – radio continuum: galaxies
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2011/10/10
Violent gravitational interactions can change the morphologies of galaxies and, by means of merging, transform them into elliptical galaxies. We aim to investigate how they affect the evolution of gal...
Gravitationally Induced Density Wake of a Circularly Orbiting Object As an Interpretative Framework of Ubiquitous Spirals and Arcs
Induced Density Circularly Orbiting Interpretative Framework Ubiquitous Spirals
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2011/10/9
An orbiting object in a gas rich environment creates a gravitational density wake containing information about the object and its orbit. Using linear perturbation theory, we analyze the observable pro...
The Coalsack near and far
Sun: fl ares Methods:data analysis Methods:statistical Methods:observational
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2011/10/8
Context: The large Coalsack dark cloud is one of the rare molecular clouds without clear signs of star formation. Aims: We investigate the dynamical properties of the gas within the Coalsack. Methods:...
A dark force for baryons
Beyond Standard Model Cosmology of Theories beyond the SM
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2011/10/17
We suggest the existence of a fundamental connection between baryonic and dark matter. This is motivated by both the stability of these two types of matter as well as the observed similarity of their ...
Scaling and intermittency in incoherent α-shear dynamo
Dynamo – magnetic fi elds – MHD – turbulence
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2011/10/8
We consider mean-field dynamo models with fluctuating \alpha effect, both with and without shear. The \alpha effect is chosen to be Gaussian white noise with zero mean and given covariance. We show an...
Rindler force at large distances
force large distances
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2011/10/8
Given some assumptions it is possible to derive the most general theory of gravity at large distances. The force law derived from this theory contains a Rindler term in addition to well-known contribu...
Primordial black hole formation and hybrid inflation
Primordial formation hybrid inflation
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2011/9/29
We calculate the contribution to the curvature perturbation, that is generated while the waterfall field grows exponentially (which can occur only if the waterfall field mass is $m\gg H$). We consider...
The case for testing MOND using LISA Pathfinder
testing using Pathfinder
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2011/9/28
We quantify the potential for testing MOdified Newtonian Dynamics (MOND) with LISA Pathfinder (LPF), should a saddle point flyby be incorporated into the mission. We forecast the expected signal to no...
Covariant Thermodynamics and Relativity
Covarian Thermodynamics Relativity
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2011/10/18
This thesis deals with the dynamics of irreversible processes within the context of the general theory of relativity. In particular, we address the problem of the 'infinite' speed of propagation of th...
General-relativistic model of hot accretion flows with global Compton cooling
accretion, accretion discs – black hole physics – X-rays: binaries – X-rays:general
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2011/9/28
We present a model of optically thin, two-temperature, accretion flows using an exact Monte Carlo treatment of global Comptonization, with seed photons from synchrotron and bremsstrahlung emission, as...
Testing model independent modified gravity with future large scale surveys
Testing model independent modified gravity future large scale surveys
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2011/9/27
Model-independent parametrisations of modified gravity have attracted a lot of attention over the past few years and numerous combinations of experiments and observables have been suggested to constra...
Large Variations of the coefficient $J_2$ of geopotential, and the dynamical Love number $k_2^d$ from the analysis of laser ranging to LAGEOS~1 and LAGEOS~2
satellites geopotential tides Love numbers SLR ob- servations
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2011/9/26
Secular and seasonal variations of the coefficient $J_2$ of the geopotential are studied from the analysis of laser measurements of distances to the geodetic satellites LAGEOS~1 (1988--2003) and LAGEO...
深空探测中多普勒的建模与应用
深空探测 多普勒 观测模型 轨道计算
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2014/4/15
针对深空探测中的多普勒观测资料的单程和三程模式，分别给出了瞬时和积分的观测模型，双程多普勒观测模型是三程模式的一个特殊情况。通过比较瞬时和积分多普勒的差异，推断在积分周期取得足够小时，瞬时观测模型与积分模型是一致的。利用2009年8月份对火星探测器MEX的三程多普勒测轨资料的处理，检验了三程多普勒资料观测模型的正确性，利用约一个圈次8小时三程多普勒数据进行轨道计算，定轨结果与欧空局重建轨道位置差约...