Nerdzr

hes of the earth sciences. Published continuously since 1890.

Introducing GSA Bulletin Invited Review Articles Current Issue : March 2012 Pre-Issue Publication Last updated April 6, 2012 Archive GSA Bulletin in the News Search Impact Factor: 3.637 Five-year Impact Factor: 4.327 Geological Society of America Bulletin is a leading international journal for major scholarly research in all branc

La sphère de Bloch, du nom du physicien et mathématicien Félix Bloch, est une représentation géométrique d'un état pur d'un système quantique à deux niveaux ; c'est donc, entre autres, une représentation d'un qubit. Il est possible de généraliser la construction de cette sphère un à un système à n niveaux.

Henry David Thoreau

Lorsque les Puritains arrivèrent en Amérique du Nord, c’est tout naturellement que, profondément imprégnés de langage biblique, ils assimilèrent leur entreprise à la traversée du désert des Israélites, à une errand into the wilderness qui faisait d’eux des envoyés ou messagers dans la nature sauvage, symbole de la mise à l’épreuve qui devait permettre de recouvrer la pureté de la foi. La nature était ainsi fermement encadrée dans un paradigme providentialiste qui suffisait à lui donner sens. Dans cette perspective, elle apparaissait comme un lieu sauvage que l’homme avait pour mission de domestiquer et de rendre productif, par un processus de réforme ou d’amélioration (improvement) qui ferait de ces "solitudes hurlantes" (howling wilderness) la terre promise qu’était appelé à être le Nouveau Monde.

Japan collab transmits record data speeds on terahertz waves

Researchers from Japan-based semiconductor manufacturer Rohm, together with a team from Osaka University, have come up with a chip that, in experiments, has achieved a wireless data transmission speed of 1.5 gigabits per second. This is a record breaker as the world's first terahertz wireless communication achieved with a small semiconductor device. The chip’s ability to transmit at such a quick speed is not the end of the story. Even higher transmission speeds of up to 30 Gbps may be possible in the future, according to reports.

“Research into terahertz technology utilising Terahertz frequency (100GHz-10THz) is now receiving increasing attention around the world,” according to an Osaka University publication

A particle carrying a charge of 1 coulomb and passing through a magnetic field of 1 tesla at a speed of 1 meter per second perpendicular to said field experiences a force of 1 newton, according to the Lorentz force law. As an SI derived unit, the tesla can also be expressed as (in SI base units).[3] Units used: A = ampere C = coulomb kg = kilogram m = meter N = newton s = second T = tesla V = volt Wb = weber [edit] Electric vs Magnetic Field

The difference between magnetic field strength (in tesla) vs electric field strength can be confusing.[citation needed] The difference is that a force of magnetic field on a charged particle is generally due to the charged particle's movement[4] while the force imparted by an electric field on a charged particle is not due to the charged particle's movement. This can be seen by looking at the units for each. Electric field is N/C, while magnetic field (in tesla) can be written as N/(C*m/s). The difference between the two is m/s, or velocity. This can further be seen by noting that whether a field is magnetic or electric is dependent on one's relativistic reference frame (that is: one's velocity relative to the field).[5][6] In ferromagnets the movement creating the magnetic field is the electron spin[7] (and to a lesser extent electron orbital angular momentum). In current carrying wire (electromagnets) the movement is due to electrons moving through the wire (whether the wire's straight or circular).