175 research outputs found
Measuring CMB Polarization with BOOMERANG
BOOMERANG is a balloon-borne telescope designed for long duration (LDB)
flights around Antarctica. The second LDB Flight of BOOMERANG took place in
January 2003. The primary goal of this flight was to measure the polarization
of the CMB. The receiver uses polarization sensitive bolometers at 145 GHz.
Polarizing grids provide polarization sensitivity at 245 and 345 GHz. We
describe the BOOMERANG telescope noting changes made for 2003 LDB flight, and
discuss some of the issues involved in the measurement of polarization with
bolometers. Lastly, we report on the 2003 flight and provide an estimate of the
expected results.Comment: 12 pages, 8 figures, To be published in the proceedings of "The
Cosmic Microwave Background and its Polarization", New Astronomy Reviews,
(eds. S. Hanany and K.A. Olive). Fixed typos, and reformatted citation
On the Synthesis of Mobile Robots Algorithms: the Case of Ring Gathering
International audienceRecent advances in Distributed Computing highlight models and algorithms for autonomous swarms of mobile robots that self-organize and cooperate to solve global objectives. The overwhelming majority of works so far considers handmade algorithms and correctness proofs.This paper is the first to propose a formal framework to automatically design distributed algorithms that are dedicated to autonomous mobile robots evolving in a discrete space. As a case study, we consider the problem of gathering all robots at a particular location, not known beforehand. Our contribution is threefold. First, we propose an encoding of the gathering problem as a reachability game. Then, we automatically generate an optimal distributed algorithm for three robots evolving on a fixed size uniform ring. Finally, we prove by induction that the generated algorithm is also correct for any ring size except when an impossibility result holds (that is, when the number of robots divides the ring size)
BOOMERanG Constraints on Primordial Non-Gaussianity from Analytical Minkowski Functionals
We use Minkowski Functionals (MF) to constrain a primordial non-Gaussian contribu-
tion to the CMB intensity field as observed in the 150 GHz and 145 GHz BOOMERanG
maps from the 1998 and 2003 flights, respectively, performing for the first time a joint
analysis of the two datasets. A perturbative expansion of the MF formulae in the limit
of a weakly non-Gaussian field yields analytical formulae, derived by Hikage et al.
(2006), which can be used to constrain the coupling parameter fNL without the need
for non-Gaussian simulations. We find -1020 < fNL < 390 at 95% CL, significantly
improving the previous constraints by De Troia et al. (2007) on the BOOMERanG
2003 dataset. These are the best fNL limits to date for suborbital probes
Astronomical Distance Determination in the Space Age: Secondary Distance Indicators
The formal division of the distance indicators into primary and secondary leads to difficulties in description of methods which can actually be used in two ways: with, and without the support of the other methods for scaling. Thus instead of concentrating on the scaling requirement we concentrate on all methods of distance determination to extragalactic sources which are designated, at least formally, to use for individual sources. Among those, the Supernovae Ia is clearly the leader due to its enormous success in determination of the expansion rate of the Universe. However, new methods are rapidly developing, and there is also a progress in more traditional methods. We give a general overview of the methods but we mostly concentrate on the most recent developments in each field, and future expectations. © 2018, The Author(s)
Human Immunodeficiency Virus (HIV) Type 1-specific B cell response in seronegative subjects at risk for HIV exposure
In vivo evidence of HIV-1 productive infection in cerebrospinal fluid of patients with HIV-1 encephalitis
Human Immunodeficiency Virus (HIV) Type 1-specific B cell response in seronegative subjects at risk for HIV exposure
In vivo evidence of HIV-1 productive infection in cerebrospinal fluid of patients with HIV-1 encephalitis
Analisi della cinetica replicativa in cultura primaria di isolati di HIV-1 da soggetti in vario stadio di malattia
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