22,203 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
Radioisotopic Biochemical Probe for Extraterrestrial Life Fifth Annual Progress Report
Radiosotopic biochemical probe for extraterrestrial life - Gulliver progra
Quark structure of hadrons and high energy collisions
There exists a large field for phenomenological models in which the knowledge
of the structure of hadrons in terms of QCD constituents obtained from deep
inelastic scatterings is related to their behaviour in soft processes. One of
the simplest and oldest models is the additive quark model, with the rules of
quark statistics following from it. Originally, the relations of quark
combinatorics for hadron yields were based on the qualitative description of a
multiparticle production process as a process of the production of
non-correlated quarks and antiquarks followed by their subsequent fusion into
hadrons [20],[21]. As a large amount of new precision measurements appear, and,
on the other hand, our understanding of QCD becomes deeper, a new level of
understanding of quark-gluon physics in the region of soft interactions forces
us to review the relations of quark combinatorics. To do so, an especially good
possibility is provided by the experimental data for hadronic Z^0 decays which
allow us to check the relations of quark combinatorics for a new type of
processes: quark jets in the decays Z^0 -> q\bar{q} -> hadrons [32].Comment: 55 pages, 23 figure
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