2,477 research outputs found
Coherent Baryogenesis and Nonthermal Leptogenesis: A comparison
We present a new mechanism for baryogenesis: at preheating after inflation
fermions acquire a varying mass by their coupling to a time dependent field.
Their CP-violating mass matrix can generate a charge asymmetry to be
transformed into a lepton asymmetry through decay into standard model particles
and heavy Majorana neutrinos. In a concrete model of hybrid inflation we
compare ``coherent baryogenesis'' with nonthermal leptogenesis by perturbative
decay of the inflation condensates.Comment: 6 pages, 2 figures, contribution to the Proceedings of Strong and
Electroweak Matter 2004 (SEWM2004), Helsinki, Finland, June 16-19, 200
Distinguishing Carrot's Characteristics by Near Infrared (NIR) Reflectance and Multivariate Data Analysis
Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is a paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 6 (2004): N. Abu-Khalaf, B. Bennedsen and G. Bjorn. Distinguishing Carrot's Characteristics by Near Infrared (NIR) Reflectance and Multivariate Data Analysis. (March 2004
Star-Formation in the Ultraluminous Infrared Galaxy F00183-7111
We report the detection of molecular CO(1-0) gas in F00183-7111, one of the
most extreme Ultra-Luminous Infrared Galaxies known, with the Australia
Telescope Compact Array. We measure a redshift of 0.3292 for F00183-7111 from
the CO(1-0) line and estimate the mass of the molecular gas in 00183 to be 1
10 M. We find that F00183-7111 is predominately
powered by the AGN and only 14 per cent of the total luminosity is
contributed by star-formation (SFR 220 M yr). We also
present an optical image of F00183-7111, which shows an extension to the East.
We searched for star-formation in this extension using radio continuum
observations but do not detect any. This suggests that the star-formation is
likely to be predominately nuclear. These observations provide additional
support for a model in which the radio emission from ULIRGs is powered by an
intense burst of star-formation and by a radio-loud AGN embedded in its
nucleus, both triggered by a merger of gas-rich galaxies.Comment: 5 pages, 2 figures, Accepted for publication in MNRAS Letters
Accepted 2014 January 19. Received 2013 December 30; in original form 2013
November 2
A theoretical exploration of the relationship between outsourcing and business/ict alignment
In this paper we examine the likely impact of two different outsourcing scenarios on business/ICT alignment. We argue that there is a need to put ICT outsourcing in a broader business context and that it has an important impact on how organisations align business and ICT. Based on previous literature we combine several conceptual models on both outsourcing and B/ICT alignment and identify the possible problem areas in each of these scenarios. The goal of this âtheoretical exerciseâ, which is mainly based on argument, is to end the paper with a theoretical proposition which needs to be tested and backed by empirical data. Therefore, this paper should be regarded as the first step in a research process
A Computational Study of the Distribution of Particles in a Lab-Scale CFB Boiler
When two-fluid modeling is used to predict riser flows there have been difficulties in predicting the solids hold up in risers represented by the correct pressure drop profile. A way of encountering this inherent problem in current Eulerian-Eulerian CFD modeling is to approximate the actual particle size distribution by using more particle phases instead of the current practice of using one mean diameter. For the lab-scale CFB investigated, CFD simulations show that a mal-distribution occurs in the CFB; the larger particles are retained in the riser, whereas the intermediate and small particles are distributed both in the return leg and the riser. Simulations using an altered particle size distribution, i.e. a larger amount of large particles, show significant improvements in the pressure profile in the bottom part of the riser
High-current performance evaluation of DCCTs
The evaluation of high performance DCCT's to the ppm level has never been an easy task. With the LHC demanding currents up to 13 kA, a whole series of problems has arisen in the accurate measurement of these devices. In order to tackle these problems, new facilities have been designed for laboratory measurements under full power operating conditions. These include a high performance low voltage 20 kA power converter, quasi-coaxial bus-bar structures, Kusters Bridge range extenders and a novel bipolar 0 - 10 A current calibrator with resolution and linearity better than ± 0.5 ppm. This paper will present an overview of the complete facility and give more detail on the new current calibrator. Initial results will be presented, along with application areas which advance the state of the art in this field of measurements
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