3,250 research outputs found
Current and voltage based bit errors and their combined mitigation for the Kirchhoff-law-Johnson-noise secure key exchange
We classify and analyze bit errors in the current measurement mode of the
Kirchhoff-law-Johnson-noise (KLJN) key distribution. The error probability
decays exponentially with increasing bit exchange period and fixed bandwidth,
which is similar to the error probability decay in the voltage measurement
mode. We also analyze the combination of voltage and current modes for error
removal. In this combination method, the error probability is still an
exponential function that decays with the duration of the bit exchange period,
but it has superior fidelity to the former schemes.Comment: 9 pages, accepted for publication in Journal of Computational
Electronic
Regularization for effective field theory with two heavy particles
A regularization for effective field theory with two propagating heavy
particles is constructed. This regularization preserves the low-energy analytic
structure, implements a low-energy power counting for the one-loop diagrams,
and preserves symmetries respected by dimensional regularization.Comment: 12 pages, 4 figures. Some typos have been corrected, a sentence has
been moved, and two formulas have been further simplifie
Bis (pentafluorofenil) - Complejos de platino (II)
Solutions apparently containing «Pt(C5F5)2» are obtained by reaction of K2PtCl4 with (C6F5)MgBr in THF and further addition of p-dioxane. The addition of different ligands to these solutions results in the formation of 4-coordinate platinum (II) complexes of the type (C6F5)2PtL>)2 [L = PPh3, AsPh3, SbPh3, OPPh3, OAsPh3, NH3]. The complexes with PPh3 and AsPh3 had been previously prepared by another method, while the other ones are reported here by first time. Structural data for these organocomplexes are obtained by V-UV and IR spectroscopy and magnetic susceptibility measurements
Beam heat load analysis with COLDDIAG: a cold vacuum chamber for diagnostics
The knowledge of the heat intake from the electron beam is essential to design the cryogenic layout of superconducting insertion devices. With the aim of measuring the beam heat load to a cold bore and understanding the responsible mechanisms, a cold vacuum chamber for diagnostics (COLDDIAG) has been built. The instrumentation comprises temperature sensors, pressure gauges, mass spectrometers and retarding field analyzers, which allow to study the beam heat load and the influence of the cryosorbed gas layer. COLDDIAG was installed in the storage ring of the Diamond Light Source from September 2012 to August 2013. During this time measurements were performed for a wide range of machine conditions, employing the various measuring capabilities of the device. Here we report on the analysis of the measured beam heat load, pressure and gas content, as well as the low energy charged particle flux and
spectrum as a function of the electron beam parameters
A Characterization of the ALMA Phasing System at 345 GHz
The development of the Atacama Large Millimeter/submillimeter Array (ALMA)
phasing system (APS) has allowed ALMA to function as an extraordinarily
sensitive station for very long baseline interferometry (VLBI) at frequencies
of up to 230 GHz (~1.3 mm). Efforts are now underway to extend use of the APS
to 345 GHz (~0.87 mm). Here we report a characterization of APS performance at
345 GHz based on a series of tests carried out between 2015-2021, including a
successful global VLBI test campaign conducted in 2018 October in collaboration
with the Event Horizon Telescope (EHT).Comment: 22 pages, 11 figures, 7 tables, accepted for publication in PAS
The X-Rays wind connection in PG 2112+059
We study the connection between the X-ray and UV properties of the broad
absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by
comparing Chandra-ACIS data with contemporaneous UV HST/STIS spectra in three
different epochs. We observe a correlation whereby an increase in the
equivalent-widths (EWs) of the BALs is accompanied by a redder UV spectrum. The
growth in the BALs EWs is also accompanied by a significant dimming in soft
X-ray emission (<2 keV), consistent with increased absorption. Variations in
the hard X-ray emission (>2 keV) are only accompanied by minor spectral
variations of the UV-BALs and do not show significant changes in the EW of
BALs. These trends suggest a wind-shield scenario where the outflow inclination
with respect to the line of sight is decreasing and/or the wind mass is
increasing. These changes elevate the covering fraction and/or column densities
of the BALs and are likely accompanied by a nearly contemporaneous increase in
the column density of the shield.Comment: 15 pages, 9 figures, accepted in MNRA
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