46,827 research outputs found
3C 345: the historical light curve (1967-1990) from the digitized plates of the Asiago Observatory
In the frame of a large project to digitize the plate archives of the Italian
and Vatican Astronomical Observatories, we have already performed the
digitization of all available plates of the field of the quasar 3C345. The
plates, approximately 100, were taken with the three telescopes of the Asiago
Observatory (122 cm, 182 cm, 67/90 cm Schmidt Telescope) in the period from
1967 to 1990. We present here essentially new data, mostly in the B band, about
the variability of 3C 345 and also of other four objects (3 quasars and the
active galaxy NGC 6212) in the same field, in that period. Beyond the well
known 3C 345 itself, also the other three quasars show variability, with a
range of 2.0 mag for Q1 and Q2, 1 mag for Q3. The low level variability
detected for the nucleus of NGC 6212 is more suspicious, and should be
confirmed by linear detector data.Comment: 8 pages, 9 figures, 7 tables, submitted to MNRA
A novel iterative strategy for protein design
We propose and discuss a novel strategy for protein design. The method is
based on recent theoretical advancements which showed the importance to treat
carefully the conformational free energy of designed sequences. In this work we
show how computational cost can be kept to a minimum by encompassing negative
design features, i.e. isolating a small number of structures that compete
significantly with the target one for being occupied at low temperature. The
method is succesfully tested on minimalist protein models and using a variety
of amino acid interaction potentials.Comment: 9 pages, 8 figure
Scalar Dark Matter in light of LEP and ILC Experiments
In this work we study a scalar field dark matter model with mass of the order
of 100 MeV. We assume dark matter is produced in the process , that, in fact, could be a background for the standard process
extensively studied at LEP. We constrain the
chiral couplings, and , of the dark matter with electrons through an
intermediate fermion of mass GeV and obtain and
for the best fit point of our analysis. We also
analyze the potential of ILC to detect this scalar dark matter for two
configurations: (i) center of mass energy GeV and luminosity
fb, and (ii) center of mass energy TeV
and luminosity fb. The differences of polarized beams
are also explored to better study the chiral couplings.Comment: 15 pages, 6 figures and 1 table. New references added and
improvements in the text. Conclusions unchange
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