Wireless Communications

Τίτλος

Wireless Communications

Θέμα

Biological rhythms

Light

Brain

Photons

Δημιουργός

Pefkaros, Markos M.

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

2002

Συνεισφέρων

Hadjioannou, S.

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

EED0425

Σύνοψη

Light reviles the world to us. Body and soul crave it. Light sets our biological clocks. It triggers in our brains the sensation of color. Light feeds us, supplying the energy for plants to grow. It inspires us with special effects like rainbows and sunsets.
Light gives us life-enhancing tools, from incandescent bulbs to laser and fiber optics. Scientists don't fully understand what light is or what it can do. They just know that it will illuminate our future.Light has been here from the beginning. There will be light, feebly, at the
end. In all it's forms-visible and invisible-it saturated the universe. It is
indestructible. Modern physics has been able to slice up all the stuff from
nature into even smaller constituents, but light won't reduce. Light is lightpure
but not simple. From ancient times scientists have tried to describe it. A
wave? A particle? Modern scientists say both.
Light is indispensable part of our life but we hardly pay any attention to it.
Light is almost like air. It's given.
Light gives us some moments of certain appreciation when a particular
manifestation of light appears - a rain bow, a sunset, a pulse of heat
lightning in a dark sky, the shimmering surface of the sea at twilight, the little
red dot from the professor's pOinter. Stained glass in a church, a flickering of
a candle, flooding the room with tomance. The flashlight looking for the
circuit- breakers after a power outage.
Usually we do not see light, but we are merely allowed to see with it! The
beauty of a red rose is only appreciated by seeing it and not by describing it.
It is the brain's interpretation of a specific wave length of light which is
roughly around 700 nanometers.
Photon is what you call light when it is behaving like a sub-atomic particle.
Photons are replacing the electrons-which we know as the negatively charged
particles that orbit the nuclei of an atom- as the favorite tool of scientists to
transmit information.
Light is now used for various purposes from the very sophisticated laser
surgery up to telephone technology.
Light could even become the prominent power source for long distance space
travel. Scientists at NASA have a new plan for a spacecraft which will use an
ultra thin sail to catch the "wind" of light beamed from an earth-based Laser.
In theory, this craft will accelerate to speeds of a fraction to the speed of light
but with no fuel.
The question of what is light still arises in mind.
Light, according to the physicist of the National Ignition Facility NIF in San
Francisco, can be used as a power source because we can compress its
energy in a very small point. This is because photons carry no charge and so
they can be near each other without compelling one another, unlike electrons.