3,014 research outputs found
On the eclipsing cataclysmic variable star HBHA 4705-03
We present observations and analysis of a new eclipsing binary HBHA 4705-03.
Using decomposition of the light curve into accretion disk and hot spot
components, we estimated photometrically the mass ratio of the studied system
to be q=0.62 +-0.07. Other fundamental parameters was found with modeling. This
approach gave: white dwarf mass M_1 = (0.8 +- 0.2) M_sun, secondary mass
M_2=(0.497 +- 0.05) M_sun, orbital radius a=1.418 R_sun, orbital inclination i
= (81.58 +- 0.5) deg, accretion disk radius r_d/a = 0.366 +- 0.002, and
accretion rate dot{M} = (2.5 +- 2) * 10^{18}[g/s], (3*10^{-8} [M_sun/yr]).
Power spectrum analysis revealed ambiguous low-period Quasi Periodic
Oscillations centered at the frequencies f_{1}=0.00076 Hz, f_2=0.00048 Hz and
f_3=0.00036 Hz. The B-V=0.04 [mag] color corresponds to a dwarf novae during an
outburst. The examined light curves suggest that HBHA 4705-03 is a nova-like
variable star.Comment: 7 figures and 2 tables, accepted for publication in Acta Astronomic
Random and free observables saturate the Tsirelson bound for CHSH inequality
Maximal violation of the CHSH-Bell inequality is usually said to be a feature
of anticommuting observables. In this work we show that even random observables
exhibit near-maximal violations of the CHSH-Bell inequality. To do this, we use
the tools of free probability theory to analyze the commutators of large random
matrices. Along the way, we introduce the notion of "free observables" which
can be thought of as infinite-dimensional operators that reproduce the
statistics of random matrices as their dimension tends towards infinity. We
also study the fine-grained uncertainty of a sequence of free or random
observables, and use this to construct a steering inequality with a large
violation
Integrated Servies Digital Network: Issues and Options for the World\u27s Future Communications Systems
There has been virtually no public discussion of the significant public policy issues raised because of the intimidating nature of network engineering which forms the basis for nearly all the current dialogue. This paper discusses current ISDN developments, and sets forth an analytical framework within which these issues may be discussed
United States Policymaking for the Public International Forums on Communication
This paper focuses on the manner in which the United States makes its international communication policy for introduction into the international legislative forums in which it participates as a member state
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