A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Helion
Nucleus of a
Helium- 3 atom consists of two protons and one neutron bound together with a
total binding energy of 7.72 MeV. Helium-3 atom, a stable isotope of Helium
with natural abundance of ~0.00014% consists of a nucleus (Helion) and two
electrons.
Helmholtz
Coil
Device introduced
by German scientist Helmholtz. Device consist pair of conducting circular coils
each having ‘N’ turns, and carrying a current, separated by a distance
equivalent to the radius of circular loops produce a homogenous uniform
magnetic field in the mid plane between two circular coils.
Helmoltz
Function (or) Helmoltz’s Free Energy Function
It is
thermodynamic energy function pertaining to thermodynamic process in which
system exchanges heat with surrounding and there by maintains temperature
constant.
Mathematically, A = A (T, V, N); A = U-TS
Henry
It is unit of
inductance.
Hertz
It is unit of frequency which is named
after German physicist Heinrich Hertz.
Hertzian
Wave
An
electromagnetic wave produced by oscillations in electrical circuit with
frequency in range 3x1010 to about 1.5x105 Hertz. They
are named after Heinrich Rudolph Hertz, a German physicist.
Hetero
Junction
A PN junction
that encompasses two different semi conductors is called as hetero junction.
The most distinctive feature of such junctions is that the P and N region have
different energy band gaps.
Hexagonal
Closely Packed Crystal Structure
Crystal structure
having unit cell which has top and bottom faces forming regular hexagon and
surround a single atom in the center. Another plane provides three additional
atoms.
Higgs
Particle or Higgs Boson
It is first
theorized in 1964 by British physicist Peter Higgs and others, which is
presumed to be basic building blocks of matter to interact. They have been
confirmed to exist on 14th march 2013. The discovery of particle appears
to confirm existence of Higgs field. The heavier particles interact strongly
with Higgs field and light ones interact weakly with this field.
Hilbert
Space
The mathematical
concept named after David Hilbert generalizes notion of Euclidian space. It is
an abstract vector space possessing structure of an inner product that allows
length and angle to be measured.
Histogram
A histogram is
graphical representation of distribution of data. It is an estimate of
probability distribution of continuous variable. It consists of tabular frequencies shown as
adjacent rectangles, erected over discrete intervals, with an area equal to
frequency of observations in the interval. The height of rectangle is also
equal to frequency density of interval i.e. frequency divided by width of
interval. The total area of histogram is equal to no. of data.
Hole
For
semiconductors and insulators, a vacant electron state in the valence bond that
behaves as positive charge carrier in an electric field. A hole is not a
particle and it doesn’t exist by itself.
Hologram
Consists of
record of both amplitude and phase of light wave scattered from object so that it
can give 3D view of the object but image cannot be observed directly from
hologram because it requires reconstructing.
or
It is counterpart of photographic negative.
It consists of record of both amplitude and phase of light wave scattered from
object so that it can give 3D view of the object, but image cannot be observed
directly from hologram because it requires reconstructing.
Holography
Holography dates from 1947, when
British (native of Hungary) scientist Dennis Gabor developed
the theory of holography while working to improve the resolution of an electron
microscope. Gabor coined the term hologram from the Greek words ‘holos’ meaning
"whole," and ‘gramma’, meaning "message".
Holography is
"lens less photography" in which an image is captured not as an image
focused on film, but as an interference pattern at the film. Typically,
coherent light from a laser is
reflected from an object and combined at the film with light from a reference
beam. This recorded interference pattern actually contains much more
information that a focused image, and enables the viewer to view a true
three-dimensional image which exhibits parallax. That is, the image will change
its appearance if you look at it from a different angle, just as if you were
looking at a real 3D object.
Holonomic
Constraints
Constraints which
are expressible in the form of f(r1,r2, …..rn,
t) = 0.
Homo Junction
A junction containing only one semiconductor, such as silicon PN junction, is called Homo junction.
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