sona ho... (astrosona)'s Public Profile in the Diigo Community

I always loved astronomy... since i remember my name... It was a long way to get here.... i wish i had chance to learn more and study more astronomy... but unfortunately i can't believe i just haven't enough time to go out for sky observing in last years....!!! i am currently an astronomy PhD stu...

I use Diigo because it is GREAT to have a tracking of my thoughts on web pages... my questions and ideas... I always liked to use some thing like this and i searched it and i found it!

Member since Jan 18, 2008, follows 2 people, 0 public groups, 29 public bookmarks (29 total).

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Recent Bookmarks and Annotations

DPS 2009 Events on 2009-10-05
- Decadal Survey - Satellites of the Outer Planets Panel: Public Meeting
- Laboratory Research Workshop
- 6 more annotations...
- - Open Access to the Planetary Sciences Literature
  - SBAG Workshop: Debating Priorities for the Decadal
    Survey in the Area of Primitive Bodies (public meeting)
  - DPS Women in Astronomy Workshop: Professional Developement
  - The Search for KBO Targets for New Horizons: How You Can Help
  - SBN Advisory Council Group
    
    Date: Tuesday, 2009 October 6, 18:30-20:00
    
    Location: Boardroom 1
  - SBN Advisory Council Group
UC Davis - Electrical and Computer Engineering on 2009-09-18
- ENG17. Circuits I
- ENG100. Electronic
  Circuits and Systems
WIYN Directory on 2009-09-17
- Charles Corson
- Dianne Harmer
UC Davis Physics Department on 2009-09-16
- 10G. Introduction to Stars, Galaxies, and the
  Universe (3)
- 10L. Observational Astronomy Laboratory (1)
- 17 more annotations...
- - 10S. Introduction to the Solar System (3)
  - 25. Introduction to Modern Astronomy and
    Astrophysics (4)
    
    (Formerly Astronomy 2)
  - 10. Topics in Physics for Nonscientists (4)
  - 108. Optics (3)
  - 108L. Optics Laboratory (1)
  - 116A. Electronic Instrumentation (4)
  - 116B. Electronic Instrumentation (4)
  - 116C. Introduction to Computer-Based Experiments
    in Physics (4)
  - 122. Advanced Physics Laboratory (4)
  - 123. Signals and Noise in Physics (4)
  - 127. Introduction to Astrophysics (4)
  - 157. Astronomy Instrumentation and Data Analysis
    Laboratory
  - 190. Careers in Physics
    (1)
  - 253. Signals and Noise in Physics
    (3)
  - 266. Data Analysis for Astrophysics (3)
  - 270. Current Topics in Physics Research (2)
  - 285. Careers in Physics
IRAF INTRO on 2009-09-12
- edit your .cshrc file and add the following
  - sona ho... on 2009-09-12
    
    OK i found it... i edit it but still doesn't work.. i can't get trough "source.cshrc" part!
  - sona ho... on 2009-09-12
    
    what does it mean by ".cshrc" file???
- gterms
  by default, edit your .cshrc file and add t
- 1 more annotations...
- - The
    point of this is that you might be working on more than one data
    reduction project, each of which requires IRAF to run with different
    parameters. If you set up a different IRAF home directory for each
    project, and --- this is the important part --- ALWAYS START UP IRAF
    IN THE APPROPRIATE HOME DIRECTORY FOR THE PROJECT YOU ARE WORKING ON,
    then you will never accidentally operate on one data set using the parameters
    for another.
Iraf Tutorial : Data I/O on 2009-09-11
- IRAF now supports FITS files directly, so it is no longer necessary to use the rfits task to read data files into .imh and .pix files.
- IRAF now supports FITS files directly, so it is no longer necessary to use the rfits task to read data files into .imh and .pix files.
- 1 more annotations...
- - IRAF now supports FITS files directly, so it is no longer necessary to use the rfits task to read data files into .imh and .pix files.
Fujitsu LifeBook T1010 User Review on 2009-08-05
- Fujitsu Lifebook T1010
- Fujitsu Lifebook T1010
- 1 more annotations...
- - sona ho... on 2009-08-05
    
    this is the best erview for this tablet that i had found so far... very useful
Prism (optics) encyclopedia topics | Reference.com on 2009-07-22
- Prisms will generally disperse light over a much larger frequency bandwidth than diffraction gratings, making them useful for broad-spectrum spectroscopy. Furthermore, prisms do not suffer from complications arising from overlapping spectral orders, which all gratings have.
  Prisms are sometimes used for the internal reflection at the surfaces rather than for dispersion. If light inside the prism hits one of the surfaces at a sufficiently steep angle, total internal reflection occurs and all of the light is reflected. This makes a prism a useful substitute for a mirror in some situations.
- Grisms (grating prisms)
  
  Diffraction gratings may be replicated onto prisms to form grating prisms, called "grisms". A transmission grism is a useful component in an astronomical telescope, allowing observation of stellar spectra. A reflection grating replicated onto a prism allows light to diffract inside the prism medium, which increases the dispersion by the ratio of refractive index of that medium to that of air.
untitled on 2009-07-22
- A ray first passes through a right-angle prism, then a Dove prism, and then an Almici roof prism (a right-angle prism cannot be used at the bottom, because that would mean that the ray will be reflected 3 times and thus the final image will be left-handed). Now the top prism can be rotated while the bottom one remains fixed. How should the Dove prism behave? Since it rotates an image at twice the rate of the rotation of the incoming image, the Dove prism should rotate at half the angular speed of the right-angle prism. This is achieved using differential gears Keep in mind that normally a periscope would include several lenses to increase the field of view and add a magnification factor.
  - sona ho... on 2009-07-22
    
    this is a really nice info but i didn;t understand why we can't use a right angle prism!? becuase in Almici roof prism we have only one reflection and thats same as right angle prism!!!! can any body help me?!
Welcome to Facebook! | Facebook on 2009-07-08