22,425 research outputs found
The life on Mars dilemma and the sample return mission
The dilemma of whether there is life on Mars impacts on the method used for sampling. The NASA Mars Sample Return Mission should be used to resolve the problems
Theory of THz Conductivity in the Pseudogap Phase of the Cuprates: A Pre-Formed Pair Perspective
In this paper we deduce transport properties in the presence of a pseudogap
associated with precursor superconductivity. Our theoretical analysis is based
on the widely adopted self energy expression reflecting this normal state gap,
which has appeared in interpretations of photoemission and in other
experiments. Thus, it should be generally applicable. Here we address THz
conductivity
measurements in the underdoped high temperature superconductors and arrive at
reasonable agreement between theory and recent experiment for both
and above and below .Comment: 8 pages, 2 figure
The Edge Electric Field of a Pyroelectric and its Applications
Following a change of temperature of a pyroelectric (PE), a depolarizing
electric field appears both inside the PE, as well as outside its edges, the
edge depolarizing electric field (EDEF). The EDEF extends outwards up to a
distance of the order of magnitude of the PE width. The mapping and the
strength of the EDEF have been calculated and analyzed for the case of a
semi-infinite pyroelectric plate. This strong EDEF (104-105 V/cm), when
penetrating into the surrounding medium, creates a variety of physical effects:
inducing electrical current in a semiconductor and affecting its resistance,
accelerating charged and neutral particles in vacuum or in a gas, generating
electromagnetic waves, modifying optical characteristics by electrooptical and
photoelasic effects, generating piezoelectric deformation and more. We show
that these EDEF induced effects could serve as a basis for the development of
various applications and devices.Comment: 27 pages including 13 figure
Radioisotopic Biochemical Probe for Extraterrestrial Life Fifth Annual Progress Report
Radiosotopic biochemical probe for extraterrestrial life - Gulliver progra
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