The efficiency of interaction of radiation with a particle and hence its optical properties depend on the particle chemical composition, size, shape, structure, etc. ... Particle size expressed in units of the wavelength of incident radiation, together with chemical composition, most strongly affects the optical properties of a scatterer. ... There are many methods to solve the light-scattering problem for a homogeneous spheroid (our survey of the light-scattering methods see here ). ...

... Zodiacal Light and the False Dawn . ... An unusual triangle of light will be particularly bright near the eastern horizon before sunrise during the next two months for observers in Earth's northern hemisphere. Once considered a false dawn, this triangle of light is actually Zodiacal Light, light reflected from interplanetary dust particles. APOD: 2004 August 24- Supply Ship Approaches the Space Station . ... Looking Out Over Mars . ... Earth at Night . ... Lightning on Earth . ... August . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . ... Monthly Sky Notes . ... March . ... By admin March 1, 2016 Posted in: March . ... Because of this, Jupiter will be brighter than it has been at any other time this year and will be visible all night long. ... There will be a New Moon in the sky on 9th March, so no moon light will flood the sky and we will be able to see many of the stars. ... A lunation or synodic month is the mean (average) time from one new moon to the next. ...

... 8, ``Celestial Mechanics'', 2002 On non--gravitational acceleration in Harrington--Abell comet motion due to Jupiter O. F. Grigoryan 1 , Yu. D. Medvedev 2 1 Vologda State Pedagogical Unyversity, Vologda, Russia 2 Institute of Applied Astronomy, St. Petersburg, Russia The problem of the tidal forces influence on the cometary nucleus in vicinity of Jupiter is considered. ... It means that the exterior part of cometary nucleus has been broken during approach and went off the nucleus. ...

... Episode and Level # : E2M1 Single Player : Yes Cooperative 2-4 Player : Yes (tested) Deathmatch 2-4 Player : Yes (tested I'm not a deathmatch player but.. I did enjoy playing it in deathmatch mode with another player) Difficulty Settings : Yes New Sounds : Yes New Graphics : Yes Demos Replaced : Demo1,Demo2 * Construction * Base : New level from scratch Build Time : 1.680035E+39 Editor(s) used : Deu and IDBSP Known Bugs : Will play slowly on 386 40 machines. ...

... Data . ... WFPC2 Home . ... A common analysis problem for WFPC2 observations is the subtraction of the PSF from a much fainter background object. ... Make PSF observations at the same location. ... Make PSF observations using the same filter, and using a star with a similar spectrum. ... Observers with M(target) -- M(bright star) larger than the limiting values in the center column should be prepared to use PSF subtraction (i.e., using PSF from Tiny Tim, the archives, or their own observations). ...

MIC Discussion Discussion of the Maximal Information Coefficient Alexander W Blocker http://www.awblocker.com/ Feb 21 2012 MIC Discussion Outline Outline 1 Defining MIC Subtleties technical issues Simon Tibshirani's response Broader concerns lessons 2 3 4 MIC Discussion Defining MIC Outline 1 Defining MIC Subtleties technical issues ... MIC Discussion Broader concerns & lessons Note Concerns here are not particular to the Reshef et al. paper. ...

... One of the most obvious features of the plasma state is the rich variety of wave motions which plasmas can support. ... Some important wave parameters in general are: . ... The way the dispersion relation is calculated depends on the adopted plasma theory , which also determines the available wave modes. ... the more complicated the medium is, the more wave modes it support (we cannot have, e.g., ion plasma waves if ion motion is neglected in the first place, no matter how hot plasma is considered!)...

Optimal transportation, curvature flows, and related a priori estimates Alexander Kolesnikov Moscow 2010 1 Curvature flow Shrinking family of (convex) surfaces At, where every point x A on the curvature of A at x x = -K (x) · n(x). Here K (x) is the (Gauss) curvature of At at x. Approaches to the curvature flows · 1) Solving a parabolic nonlinear equation with smooth data ( R.S. Hamilton, R. Huisken .. ... curvature flow x = -td where t = (x). ... C1(M ) sup | ... Let F (r, ) be a smooth function. ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... 2/3-m Telescope . ... Site . ... Roof Status . ... If you select Winer to provide the site and maintenance for your remotely-operated telescope, your telescope will be housed in the modern roll-off roof observatory seen at left. ... The building computer and most customer telescope control computers are programmed to keep logs to assist in diagnosing problems in moving the roof or telescopes, or in controlling the instruments. ...

Next: Photometric Corrections Up: Long-Slit and 1D Previous: Long-Slit and 1D . This chapter describes the long-slit љ reduction package in a general way. ... The package provides about 50 basic commands to perform the calibration and to display the results, defined in the context LONG . ... The context SPEC is a low-level context including general utility commands required by the different spectroscopy packages ECHELLE , IRSPEC and LONG . ... This interface is described in the Appendix . ...

... 24-Sep-14 JOURNиES 2014 Investigation · checking possibility of nutation rates estimation based on RLG observations simulation level · combination of simulated RLG data with real VLBI data · comparison of estimates based on real RLG data (Wettzell) with results of simulation 24-Sep-14 JOURNиES 2014 Simulation ... 10-8) 24-Sep-14 JOURNиES 2014 Simulated data + VLBI (ac. lev. ...

... The procedure of radiometer signal integration can be considered as a sort of reducing dimension of the initial sampling space, where the samples are the result of analog-to-digital conversion. ... The probability distribution of the signal and spikes is completely known. ... The quality of the considered algorithm could be also illustrated by Figure 2 . ... One could see the considered adaptive algorithm is preferable even by low degree of compression, because all spikes have been depressed. ...

... You can work in group sizes as large as 5. Each individual in that group could be assigned a particular question which would allow the group to complete the assignment in a more efficient manner. ... Off in the corner of the store was a small black box with a big sign that read . ... As the century turned, Africa began to emerge from a Dark Age stretching as far back as life on earth, into all the years that lay ahead - years of Renaissance, Enlightenment, Industry, and, if you will, Anxiety. ...

... This paper discusses various information technology methods being applied to science education and public information. ... This paper addresses instructional technology used in astrophysics-related public programs and will explore issues related to the clientele, resource design and budgetary issues. ... Information technology methods are being applied and evolved to provide exemplary materials for science education, curricula and general public information about research and technology. ...

Next: SAS processing Up: Maintenance procedures Previous: Maintenance procedures Contents . Suitable observations should be longer than about 20 ksec, cover all the considered time period, and have different background levels, in particular the highest ones, so the sample should include observations taken at the beginning and end of the science window. It is helpful to consider objects for which no RGS spectrum is expected or to look at the RGS monitor pages. ... Michael Smith 2011-09-20 ...

... Future seminars . P a s t seminars . Seminar council . Linear and nonlinear vibrations in vortex lattices " . ... Zaburdaev, V.V. Smirnov, K.V. Chukbar (Kurchatov's Institute) . ... Evolution of “long-wave” perturbations in different regular lattices of different (i.e. with different flow functions) 2-d vortices is considered. ...

In this chapter we will consider two very simple but useful Web agents that I have written on Actor Prolog for my own needs. ... Let us start the Web agent. Fig. ... Start of the Web agent. The Context diagram consists of three blocks: "Logic Programming Sites", "Edit", and "Check". ... Some Web sites that are linked with the logic programming and Prolog are listed in the pulldown list (these addresses are transferred to the "Edit" block from the "Logic Programming Sites" block). ...

Next: Deconvolution, Restoration and Self-Calibration Up: The Individual Approach Previous: The Individual Approach . Although this is largely a matter of taste, it may be convenient (particularly if self-calibration is to be used) to split the multi-pointing visibility dataset into single pointing ones. ... Even though you are imaging just a single pointing, you will still want to use invert 's mosaic mode ( options=mosaic ). ... INVERT . ... Select a single pointing. options=mosaic . ...

The National Astronomy and Ionosphere Center (NAIC) is seeking exceptionally well-qualified applicants for a position as a Postdoctoral Research Associate in radio astronomy at the Arecibo Observatory in Arecibo , Puerto Rico . Applicants whose research interests include any field of radio astronomy that can be effectively pursued with the Arecibo telescope will be considered. ... For further information about the NAIC Arecibo Observatory see http://www.naic.edu . ...