منابع مشابه
Why trap light?
In 1865 James Clerk Maxwell showed how light propagates as electromagnetic waves. In 1984 it was realized that light can also be trapped1. My journey into this subject began as a PhD student at Harvard University, focusing on the possibility to trap or localize any classical wave in a suitable material2. This was not one of the ‘big questions of science’ at the time, but my supervisor Michael J...
متن کاملLocation as a Poverty Trap
In this paper, we ask “Can proximity to towns reduces poverty in rural areas?” For this study we have mapped all the villages in Orissa. The study is based on small area poverty estimation methodology as well as the secondary data covering 47,395 villages and 109 towns. Our main findings are (i) there is a relationship between the distance to nearest town and rural poverty and (ii) poverty leve...
متن کاملA white - light trap for Bose - Einstein condensates
We propose a novel method for trapping Bose-condensed atoms using a white-light interference fringe. Confinement frequencies of tens of kHz can be achieved in conjunction with trap depths of only a few µK. We estimate that lifetimes on the order of 10 s can be achieved for small numbers of atoms. The tight confinement and shallow depth permit tunneling processes to be used for studying interact...
متن کاملCollisional losses from a light-force atom trap.
Spontaneous-force light traps' have provided a way to obtain relatively deep static traps for neutral atoms. These allow one to produce samples containing large numbers of very cold atoms. In this paper we present an experimental study of the collisions which eject atoms from such a trap. These collisions are of considerable interest because the temperatures of the trapped atoms (10 K) are far ...
متن کاملPossibilities for francium spectroscopy in a light trap
An experimental program is under way to capture neutral francium atoms in a magneto-optic trap. Production and transport of the radioactive Fr atoms near to the trapping region have been tested, with a steady state of 107 atoms. If one hundred atoms are captured from the Maxwel l -Bol tzmann distribution into a magneto-optic trap, this will be a sufficient number for spectroscopy of the unknown...
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ژورنال
عنوان ژورنال: Ecology
سال: 1953
ISSN: 0012-9658
DOI: 10.2307/1930328