Results 161 to 170 of about 5,542,325 (204)

Navigation techniques for large-scale astronomical exploration

SPIE Proceedings, 2006
Navigating effectively in virtual environments at human scales is a difficult problem. However, it is even more difficult to navigate in large-scale virtual environments such as those simulating the physical Universe; the huge spatial range of astronomical simulations and the dominance of empty space make it hard for users to acquire reliable spatial ...
Chi-Wing Fu, Andrew J. Hanson, Eric A. Wernert   +2 more
openaire   +1 more source

Applying astronomical techniques to multiphoton microscopy

Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, 2004
The ability of multiphoton microscopy to image deeply into living tissue with minimal damage is revolutionizing life science microscopy. However, tissue induced aberrations degrade the image quality, similar to that of atmospheric turbulence on ground based telescopes.
J M Girkin, A J Wright
openaire   +1 more source

A multiplex technique for astronomical imagery in the infrared

Infrared Physics, 1977
Abstract We describe an application of a new technique of image coding to astronomy in the near infrared (λ = 2 μm). The code is materialised by a grid with transmission properties allowing real time decoding using the Fast Hadamard Transform (F.H.T.). This method allows us to approach the theoretical angular resolution of the telescope.
B. De Batz, S. Bensammar, J. Delavaud, J. Gay, A. Journet   +4 more
openaire   +1 more source

Deconvolution techniques applied to astronomical images

Journal of Optics, 1979
The main features of the restoration analysis described utilize an apodizing filter technique to remove the noise and compensate for the seeing. The non-appearance of oscillations in the restitution error allows, using the a priori knowledges about the object, to decrease the limitation due to a raw determination of the smearing function.
G Coupinot, J Hecquet
openaire   +1 more source

The technique and possibilities of astronomical spectrophotometry

Vistas in Astronomy, 1956
Abstract The present capabilities of photographic spectrophotometry are reviewed; with large reflectors and modern optics accurate work on all naked-eye stars is possible. Photo-electric spectral scanning is best suited for low-resolution; image intensification will be needed to avoid losses due to scanning.
openaire   +1 more source

Realization of Different Techniques for Anomaly Detection in Astronomical Databases

2020
In this work we address the problem of anomaly detection in large astronomical databases by machine learning methods. The importance of such study is justified by the existence of a large amount of astronomical data that can not be processed only by human resource. We evaluated five anomaly detection algorithms to find anomalies in the light curve data
Konstantin L. Malanchev, Vladimir S. Korolev, Matwey V. Kornilov, Emille E. O. Ishida, Anastasia Malancheva, Florian Mondon, Maria V. Pruzhinskaya, Sreevarsha Sreejith, Alina Volnova   +8 more
openaire   +2 more sources

Shapelets and related techniques in radio-astronomical imaging

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
We present the use of orthonormal basis functions, in particular, shapelets and prolate spheroidal wave functions, in radio astronomical imaging. By using such methods, it is possible to overcome some limitations of traditional pixel based image deconvolution.
Sarod Yatawatta
exaly   +2 more sources

Radio Astronomical Techniques

2011
An alternative method for detecting CMEs is known as interplanetary scintillation (IPS). This monitors fluctuations in distant low frequency radio sources, which when mapped across the sky can provide information on the density structure of a heliospheric transient. This chapter discusses the theory behind IPS and how it can be used to detect and track
openaire   +1 more source

Optical properties of astronomical silicates with infrared techniques

SPIE Proceedings, 2010
Astronomical dust is observed in a variety of astrophysical environments and plays an important role in radiative processes and chemical evolution in the galaxy. Depending upon the environment, dust can be either carbon-rich or oxygen-rich (silicate grains).
R. E. Kinzer, Jr., S. Rinehart, D. Benford, E. Dwek, R. Henry, J. Nuth, R. Silverberg, C. Wheeler, E. Wollack   +8 more
openaire   +1 more source