نتایج جستجو برای: astronomical instrument

تعداد نتایج: 91251  

2004
R. Haynes J. Bland-Hawthorn M. C. J. Large K. F. Klein G. Nelson

The Photonics Crystal Fibers (PCFs) also know as “holey” or “micro-structured” fibers herald a new age for optical fibers. The astronomical applications could revolutionize instrument design through: broadband performance combined with excellent UV transmission, extremely large numerical aperture fibers, and aperture transforming fibers improving input coupling/sampling while maintaining a good...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2016
Paul Gabrielsen

In early 2016, Oxford University astrophysicist Steven Balbus was filling in for a colleague, teaching a course on general relativity. Although not an expert in relativity before the course, Balbus felt growing admiration for Albert Einstein’s century-old theory. In February, during the course, Balbus and others around the world heard news out of the Laser Interferometer Gravitational-Wave Obse...

Journal: :space ontology international journal 2015
javad shekari niri

maraghe observatory was built by such engineers as moayiededdin orozi etc. under supervision of khaje nasireddin tousi in 7th century ah. the most significant feature associated with maraghe observatory is the fact that architecture is employed to achieve astronomical purposes in this site. the reason for preferring observatory by astronomers was the fact that these units are superior to wooden...

2012
KYLE NICHOLAS CRABTREE

Molecular ions are known to be key reactive intermediates in interstellar environments, and H3 in particular is responsible for initiating a network of chemical reactions that ultimately results in the formation of the ∼170 molecules detected so far in space. Yet fundamental questions about the interstellar abundances of the two nuclear spin configurations of H3 (ortho-H + 3 , I = 3/2; and para...

Journal: :EURASIP J. Adv. Sig. Proc. 2005
Henri Lantéri Céline Theys

We consider the problem of restoring astronomical images acquired with charge coupled device cameras. The astronomical object is first blurred by the point spread function of the instrument-atmosphere set. The resulting convolved image is corrupted by a Poissonian noise due to low light intensity, then, a Gaussian white noise is added during the electronic read-out operation. We show first that...

Journal: :The journal of physical chemistry. A 2013
Anton Walsh Dongfeng Zhao Wim Ubachs Harold Linnartz

We describe a sensitive spectroscopic instrument capable of measuring broad-band absorption spectra through supersonically expanding planar plasma pulses. The instrument utilizes incoherent broad-band cavity-enhanced absorption spectroscopy (IBBCEAS) and incorporates an optomechanical shutter to modulate light from a continuous incoherent light source, enabling measurements of durations as low ...

2008
Dionne M. Haynes Michael J. Withford Judith M. Dawes Roger Haynes Joss Bland-Hawthorn

We have developed an alternative FRD empirical model for the parallel laser beam technique which can accommodate contributions from both scattering and modal diffusion. It is consistent with scattering inducing a Lorentzian contribution and modal diffusion inducing a Gaussian contribution. The convolution of these two functions produces a Voigt function which is shown to better simulate the obs...

1994
F. Lacombe N. Hubin

ADONIS is an adaptive optics user friendly instrument for the ESO 3.6-m telescope. The modal control technique is presented as a tool for optimizing the control of ADONIS. The perturbed wavefront is spread over a base of modes treated by the system in terms of their behavior with respect to the observing conditions (turbulence characteristics, anisoplanatic angle and star magnitude). This optim...

پایان نامه :دانشگاه تربیت معلم - سبزوار - دانشکده علوم انسانی و پایه 1393

burnout is a response to the chronic work stress which is prevalent mostly among the people who do people job, like teaching. the purpose of this study was to develop a valid and reliable instrument that can measure burnout in foreign language teachers. although some widely used instruments were developed before which measured burnout in teachers, a specific instrument which include specific sy...

2013
John P. McFarland Ewout M. Helmich Edwin A. Valentijn

We present a novel approach to quality control during the processing of astronomical data. Quality control in the Astro-WISE Information System is integral to all aspects of data handing and provides transparent access to quality estimators for all stages of data reduction from the raw image to the final catalog. The implementation of quality control mechanisms relies on the core features in th...

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