Wednesday, December 31, 2008
Tuesday, December 23, 2008
Staten on Nietzsche
On the one hand, there is an overall economy that includes both health and decay, on the other hand, Nietzche cannot deny himself the satisfaction of sounding the note of strong ascendancy over the forces of decay. And the question of the relation between these forces is also the question of Nietzsche's identity. -Henry Staten
Saturday, December 20, 2008
Nietzsche on Socrates
In this quite abnormal character, instinctive wisdom appears only to hinder conscious knowledge at certain points. While in all productive people instinct is the power of creativity and affirmation, and consciousness assumes a critical and dissuasive role, in Socrates instinct becomes the critic, consciousness the creator - a monstrosity per defectum! -The Birth of Tradgedy
Wednesday, December 17, 2008
von Karman coud vortices
These are called von Karman cloud vortices, named after Theodore von Karman, co-founder of the Jet Propulsion Laboratory. These vortices near the Aleutian Islands were photographed by an Expedition 15 crewmember on the International Space Station. The vortices are created by the wind encountering a barrier such as an island, then changing direction and velocity and forming eddies in the wind and subsequently, in cloud patterns. The image was taken almost a year ago, on May 23, 2007 and the location of the image is at 51.1 degrees north latitude and 178.8 degrees west longitude.
In the cloud image above, the islands disturb the wind flow. As a prevailing wind encounters the island, the disturbance in the flow propagates downstream of the island in the form of a double row of vortices which alternate their direction of rotation. The animation below (courtesy of Cesareo de la Rosa Siqueira at the University of Sao Paulo, Brazil) shows how a von Karman vortex develops behind a cylinder moving through a fluid.
Saturday, December 13, 2008
Daily Earth Science Pictures
The spectacular image above shows morning frost on a blade of grass as imaged using a low temperature scanning electron microscope (SEM). This grass fragment was held in liquid nitrogen (-196 degrees C or -320 F), to keep the frost crystals from melting, before it was imaged at the Scanning Electron Microscopy Laboratory in Beltsville, Maryland. Frost crystals form perpendicular to individual blades of grass. Note that although these plate type crystals are hexagonal, a number of them appear to be square-shaped.
This photo, taken in late February, shows the constellation of the Southern Cross (Crux), at the top center of the image, as viewed from Gramado Town in southern Brazil. The night sky was clear and moonless. Stars down to a magnitude 9 or so are shown, including some deep sky nebulosity. Crux is a southern circumpolar constellation -- comparable in declination or latitude to Ursa Major (Big Dipper) in the Northern Hemisphere.http://epod.usra.edu/archive/epodviewer.php3?oid=185888
The Southern Cross is indeed a brilliant constellation, consisting of several bright gems in the shape of a cross -- more or less. The brightest is Alpha Crucis (magnitude of 1.1), which is actually a triple star system. One of the stars is about 650 times as bright as our Sun and another is almost 1,000 times as bright. Beta Crusis (magnitude 1.5) is a blue star, and Gamma Crusis, at the head of the cross, is an orange colored second magnitude star. The star denoting the right-most corner on the cross (Delta Crusis) is the faintest of the four (third magnitude). Perhaps only the magnificent Orion has three bright stars that appear to be so close to each other.