Astronomy Seminar At Tartu Observatory 3 PM, 24-May-2017
Astronomy seminar at Tartu Observatory 3 PM, 24-May-2017
Indrek Vurm
“Gamma-ray bursts and their emission mechanisms”
Abstract:
“Gamma-ray bursts (GRBs) are the most energetic explosions in the Universe after the Big Bang. They are observed as sudden flashes of gamma rays from random directions in the sky, lasting from seconds to minutes. GRBs are thought to result from cataclysmic events associated with the birth of a compact object (neutron star or a black hole) either in the collapsing core of a massive star or in a NS-NS or NS-BH merger. Despite being discovered almost half a century ago, the mechanism of their emission is still a matter of active debate. I will review our current understanding of the processes at work and will discuss how detailed numerical modelling can place constraints on the physical conditions at the source as well as the GRB environments.”
Presentation (pdf).
More Posts from Kimduong-lhp-blog and Others
Hands according to composers
Credit to Redditor NeokratosRed !!
Idea explanation:
Chopin: mixer because he reminds me of one sometimes. Example. Scriabin: he has written a lot of pieces for the left hand alone and he injured the right hand. Rachmaninoff: He had really big hands. Really big. Liszt: he sometimes reaches notes at the other side of the piano. Ravel: he has delicate, water hands and very often the left and right hand play on top of each other. Beethoven: he is powerful and this is also a reference to the hammerklavier Satie: his touch is very gentle and it sounds like he is playing with gloves. Boulez: Just to give you an idea. Cage: the 'no hands' is a joke for 4'33'' and the objects on the keyboard are a reference to his prepared pianos. Feldman: most of his compositions use just a few notes. Mozart: Rolling pins because of all the scales. Schubert: A lot of his pieces have very articulated right hand passages that go back and forth like a wheel and really easy left hand ones. Bach: robot hands because he was so structured and calculating in his pieces. (Side note: amazing book) Debussy: really soft touch, just like feathers. Glass: Pendulum and metronome because of his style that led him to be very technical, a bit like Bach, but it's more complicated than that. Bartok: drum beaters because of the power of some of his compositions.
“The Golden Key - a video by Jonathan Quintin Art
Phi: 1.618 is the ratio the universe uses to multiply and divide itself at all scales...
Explore the connected universe in an interactive online learning community with Nassim Haramein, the Academy faculty and participants from around the world: The Resonance Academy –> http://bit.ly/getconnected-fb2 “
He has not lived in vain who dies the day he is told of the true path. - 朝聞道， 夕死可矣. - Triêu văn đạo, tịch tử khả hỉ.
Where do stars come from and where do they go?
“It is very poetic to say that we are made from the dust of the stars. Amazingly, it’s also true! Much of our bodies, and our planet, are made of elements that were created in the explosions of massive stars. Let’s examine exactly how this can be.” (NASA’s Educators’ Corner)
