Author Archives: admin

Fox cubs on last year grass

Posted on 20. April 2013 by admin

Snow from yesterday is gone, and so fox cubs can play and enjoy sunny day. Just 30 yards from house. Let’s hope pretty soon they could see for the first time green grass.

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Winter in Minnesota does not give up

Posted on 19. April 2013 by admin

Astronomical Winter ended already on March 20 at 6:02 CDT (11:02 UT), but looking outside, there is no Spring, no green grass, no green leafs. This Friday morning on April 19th snow again. This bird on the deck has to … Continue reading →

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Java executable jar file

Posted on 19. April 2013 by admin

Once a while is needed java executable jar file using java jar tool. Here is an example of the batch file, let’s say makejar.bat, which can create executable jar file. Expects package name examples. The first parameter is package subdirectory, … Continue reading →

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Skype from command line

Posted on 19. April 2013 by admin

Once a while is handy to be able use Skype from somebody else computer. In this case one can copy Skype and personal data (contact list) to USB flash drive. Here is what could be done. This example is using … Continue reading →

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Deliberate practice

Posted on 22. July 2012 by admin

Yes, I would agree with Time article, that only deliberate practice is really effective, and it can lead to mastery. It is truth not only in music.

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Why is the letter “x” the unknown?

Posted on 7. June 2012 by admin

Answer can be found at TED speech by Terry Moore, executive director at the Radius Foundation. When Arabic texts made their way to Spain in the 11th century, Europe wanted to translate this mathematical wisdom of the East into a written, Western language. Attempts … Continue reading →

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Hinge tracker

Posted on 2. April 2012 by admin

For taking picture of the sky is mount of the camera maybe more important, than camera itself. For long exposure, for sure. Cheap and portable solution could be hinge mount or hing tracker. Several of such mounts are at Gary Seronik website. … Continue reading →

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Solar system simulated in Java applet

Posted on 14. January 2012 by admin

Nice applet showing Solar system at  http://weelookang.blogspot.com/2011/06/ejs-open-source-kepler-3rd-law-system.html   There are links to more interesting applet of virtual astronomy and physics.

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Swing is not thread safe

Posted on 13. January 2012 by admin

Java Swing is not thread safe, and here are some related resources. Swing’s threading policy from package description Java SE Desktop Articles and tutorial Creating GUI SwingUtilities methods invokeAndWait and invokeLater in an example at Java Revisited blog Building thread safe GUIs at Java Developers Journal resource CD vol 6 issue … Continue reading →

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REST

Posted on 12. January 2012 by admin

Representational State Transfer (REST) is an architectural style for creating, maintaining, retrieving, and deleting resources. REST’s information-driven, resource-oriented approach to building Web services can both satisfy your software’s users and make your life as a developer easier. Web services that allow … Continue reading →

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