Next: Iterative Image Restoration Up: Adaptive Regularized Restoration Algorithms Previous: Adaptive Regularized Restoration Algorithms . There have been a variety of techniques applied to the restoration of HST images over the last several years (White 1991, Weir 1991). ... For a recent review and classification of image restoration algorithms, see Katsaggelos (1991). ... In this paper two iterative image restoration techniques are applied to the HST data restoration problem. ...

... Comet Tutorial . ... On July 1, 1993 an image was taken with the Hubble Space Telescope (HST) that clearly shows at least 15 individual fragments in one image frame of the train. ... This made an accurate orbit (or orbits) difficult to determine; however, after numerous observations of the comet, astronmers determined that the comet had passed within 96,000 kilometers (60,000 miles) of the center of Jupiter or 25,000 kilometers (16,000 miles) from the cloud tops during the July 8, 1992, approach. ...

... Comet Tutorial . ... On July 1, 1993 an image was taken with the Hubble Space Telescope (HST) that clearly shows at least 15 individual fragments in one image frame of the train. ... This made an accurate orbit (or orbits) difficult to determine; however, after numerous observations of the comet, astronmers determined that the comet had passed within 96,000 kilometers (60,000 miles) of the center of Jupiter or 25,000 kilometers (16,000 miles) from the cloud tops during the July 8, 1992, approach. ...

... Two algorithms have been used to simultaneously solve for the sky, gain, and offset for simulated sets of dithered images. ... When solving for sky and gain, achieves machine precision on noiseless data; for noisy data, solution within noise. ... When solving for sky and gain, achieves machine precision on noiseless data; for noisy data, solution slightly different from Fixsen-Arendt solution, but within noise. ... Figure 2: MIPS truth image, and full MIPS dither pattern . ...

Next: The Individual Approach Up: The Joint Approach Previous: Self-Calibration . We briefly describe some other useful tools. ... Mosaic Point-Spread Function - MOSPSF: It is occasionally instructive to look at the point-spread function at a particular position in a mosaic experiment. ... Additionally, as mentioned above, invert does not attempt to completely correct for the primary beam attenuation where there is too little data (i.e. some primary beam attenuation is in the output image). ...

Geomagnetic storms and substorms are a natural hazard similar to hurricanes, floods etc. ... Solar and geomagnetic activity also probably influences the Earth's climate and human health. ... Under southward directed IMF the Earth's magnetosphere is open to input from the solar wind flow. ... Since practical importance of solar wind measurements was recognized, a number of approaches was developed for prediction of the geomagnetic activity basing on the solar wind data. ...

Chapter 1. ... The NVIDIA Accelerated Linux Graphics Driver brings accelerated 2D functionality and high-performance OpenGL support to Linux x86_64 with the use of NVIDIA graphics processing units (GPUs). ... This document provides instructions for the installation and use of the NVIDIA Accelerated Linux Graphics Driver. ... Chapter 7, Frequently Asked Questions addresses frequently asked questions about the installation process, and Chapter 8, Common Problems provides solutions to common problems. ...

Chair of solid state physics . ... Students and postgraduate students . ... Basics of the experimental techniques . ... Units of physical quantities, systems of units, standards. ... Description of the measuring systems by differential equations. Backward influence of the measuring system on the experimental object: matching. ... Structure of the measuring systems. ... Interface between the computer and the measuring system. ... High-frequency generators and measuring systems. ...

Next: Observations and Analysis Up: The Second EGRET Catalog Previous: The Second EGRET Catalog . ... The first EGRET catalog ([ Fichtel et al. 1994b ]) covered Phase 1 of the Compton Gamma Ray Observatory (CGRO) viewing program which began shortly after launch of the observatory on 1991 April 5 and ended on 1992 November 17. ... No additional solar flares were seen during Phase 2; therefore, the first EGRET catalog summary has not been updated in the present work. ...

Statistical Tools Statistical Tools and Techniques for Solar Astronomers Alexander W Blocker Nathan Stein SolarStat 2012 Statistical Tools Outline Outline 1 Introduction Objectives Statistical issues with astronomical data Example: filter / hardness ratios Standard approach Building a statistical model Using the model 2 3 4 5 6 Statistical ...

... To address the problem of point-source photometry in restored images Lucy (1994) suggested a two-channel photometric restoration method in which the points are represented as functions in one channel and the background, constrained to be smooth by an additional entropy constraint, in the other. ... In the new CPLUCY implementation the stars can be at arbitrary x , y sub-pixel positions but the entropy constraint on the background, used by PLUCY, is retained. ...

As in the last years, the Ephemerides of Minor Planets for 2015 are prepared by the IAA RAS only in the electronic form. ... Orbital elements of all numbered planets have been determined in IAA all over again on the ground of available observations in the catalog of the Minor Planet Center. ... More detailed information on orbital elements used in the present volume of EMP and their accuracy is given in section "Information on new orbital elements". ... a) information on new orbital elements; . ...

The general formulation of the problem of light scattering (diffraction) is rather simple. The field is incident on a scatterer of the volume , and creates the field inside the scatterer and an additional (diffraction) field outside it. ... Despite the simplicity of the scheme, a concrete solution of the problem essentially depends on the geometry of the scatterer and its structure. ...

Is the ozone layer recovering ? ... Global Regulation Global Regulation · · · · 1985: Vienna Convention 1987: Montreal Protocol Several amendments and adjustments Quantity for (chemical) ozone depletion of ODS: EESC (Equivalent Effective qu ect Stratospheric Chlorine): Weighting over release and ozone depletion of individual ODS EESC for mid-latitudes http//:www.wmo.ch/web/arep/reports/ozone_2002/q&as.pdf, Seite Q.29 1980 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100 3. ...

... Right now, the world needs 10,000 additional radiotherapy machines to meet demand. ... The imaging and tracking (source finding) techniques being pioneered for Nano-X form part of an inter-disciplinary research program being developed through a CAASTRO collaboration currently involving Medical Physics and Astrophysics at Sydney and Curtin Universities, together with the Nelune Comprehensive Cancer Centre at Prince of Wales Hospital. ...

This page provides some additional material for the Part II Computational Physics course. ... Course timetable . ... Lecture 1 (introduction to Fortran) . ... Notes on the Assessed Exercise (Computing Project) . ... Computing resources by Dr. M. J. Rutter including an introduction to Fortran 95 at the right level for this course . ... An Introduction to Computer Simulation , Woolfson and Pert, Oxford . Computational Physics , Thijssen, Cambridge (Advanced and quite specialised) . ...

Starting with a teenage fascination with astronomy and the sky I have, more or less continuously through the years, cultivated and enjoyed an interest in observing natural phenomena - especially those concerning colour. ... My own particular developments have been largely in the use of spectroscopes for observing the colours of natural (and sometimes man-made) objects and phenomena. ...

Next: One example Up: No Title Previous: No Title . Wavelets are versatile tools of harmonic analysis. Because of their many uses, the word `wavelet' comes with different connotations (and different promises) to users in different fields. ... To pursue the analogy, one may wish to select from the data some contact surfaces with specific finish tolerances. the amount of information is then reduced by selection and/or by statistical means. ...

The list of "Project Team" CMBA experiments, 1968-1998 . ... J.Silk predictions for protogalaxies . Anisotropy by factor 10 less than predicted . ... Ya.Zeldovich pankaces and Daucourt grav. noise predictions . less than predicted . ... Better agreement, but less than predicted by factor 2 even for very late epoch of the galaxies formation . ... Development of the "Sakharov oscillations" ("Cosmological Gene") project at RATAN-600 using near field zone atmosphere filtration theory . ...

Next: Observations and Data Reduction Up: Coronal Hole Diagnostics out Previous: Coronal Hole Diagnostics out . ... Line width variations combined with simultaneous electron density estimates, provides a very powerful diagnostic for the solar corona. ... They find that for distances of a few arc seconds outside the solar limb, the average line of sight electron densities in the coronal holes are about a factor of 2 lower than in quiet sun regions. ... The Western limb data showed a similar trend. ...