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VOGT CORINA,ENBLIN TORSTEN A. The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.5
Magnetic fields are an important ingredient of galaxy clusters and are indirectly observed on cluster scales as radio haloes and radio relics. One promising method to shed light on the properties of cluster wide magnetic fields is the analysis of Faraday rotation maps of extended extragalactic radio sources. We developed a Fourier analysis for such Faraday rotation maps in order to determine the magnetic power spectra of cluster fields. In an advanced step, here we apply a Bayesian maximum likelihood method to the RM map of the north lobe of Hydra A on the basis of our Fourier analysis and derive the power spectrum of the cluster magnetic field. For Hydra A, we measure a spectral index of -5/3 over at least one order of magnitude implying Kolmogorov type turbulence. We find a dominant scale of about 3 kpc on which the magnetic power is concentrated, since the magnetic autocorrelation length is ${\lambda}_B = 3 {\pm} 0.5\;kpc$. Furthermore, we investigate the influences of the assumption about the sampling volume (described by a window function) on the magnetic power spectrum. The central magnetic field strength was determined to be ${\~}7{\pm}2{\mu}G$ for the most likely geometries.
Generalized Energy-Dependent Q Values for Fission
R. Vogt 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We extend Madland's parameterization of the energy release in fission toobtain the dependence of the fission Q value for major and minor actinideson the incident neutron energies in the range 0 ≤ E_n ≤ 20 MeV.Our parameterization is based on the actinide evaluations recommended for the ENDF/B-VII.1 release.
Lifelong Learning in the Long Tail Age
Sebastian Vogt 한국방송통신대학교 미래원격교육연구원 2012 평생학습사회 Vol.8 No.2
Distance learning makes an essential contribution to lifelong learning. Media-facilitated courses offer access to (higher) education for people who are, for instance, unable to combine studies at traditional universities with family and/or work commitments. As in the past, innovations driven by media technology continue to play a key role in enabling learning as a social process in distance learning to be structured efficiently and to benefit from flexibility in time and space. Ubiquitous, networked and mobile computers in their diverse forms are the backbone of modern distance learning. The digital code in the form of software makes it possible to create individual (learning) worlds on digital platforms. Access to the tools needed for this is open. Contents can be created and exchanged on a cross-linked and networked basis. Algorithms support the supply and demand with regard to individual study contents. These options of the ‘long tail’ cater to the Bologna process at European universities. The declared objective is to orient the qualification goals of the individual study programmes to the competences (output) that graduates should possess following completion of their studies, rather than to focus on teaching knowledge (input) as used to be the case. A partial consequence of this, for distance learning too, is a shift from transferring mass-media-reproduced knowledge content towards promoting individual competence through individual contents. This article shows and reflects upon how the FernUniversität in Hagen (Germany) is using educational technology to respond to the challenge of lifelong learning in the long tail age, with a few selected examples drawn from teaching and research.
Calculation of ^(239)Pu Fission Observables in an Event-by-Event Simulation
R. Vogt,J. Randrup,J. Pruet,W. Younes 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The increased interest in more exclusive fission observableshas demanded more detailed models.We describe a new computational model, \code, that aims to meet this needby producing large samples of complete fission eventsfrom which any observable of interest can then be extracted consistently,including any interesting correlations.The various model assumptions are described and the potential utility of the model is illustrated.As a concrete example, we use formal statistical methods,experimental data on neutron production in neutron-induced fission of ^(239)Pu, along with \code,to develop quantitative insights intothe relation between reaction observables and detailed microscopicaspects of fission. Current measurements of the meannumber of prompt neutrons emitted in fission taken together with lessaccurate current measurements for the prompt post-fission neutronenergy spectrum, up to the threshold for multi-chance fission, place remarkably fine constraints on microscopic theories.
Christine Vogt,David Klenosky,Stephanie Snyder,Lindsay Campbell 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7
Marketers might find the task of gauging the public’s perceptions of a landfill-to-park transformation as one of the more challenging products to market. A current project is Freshkills Park in New York City. The theoretical approach was to test proximity and experience history with familiarity, attitude toward, and intent to visit the site.
Visualizing anisotropic propagation of stripe domain walls in staircaselike transitions ofIrTe2
Mauerer, Tobias,Vogt, Matthias,Hsu, Pin-Jui,Pascut, Gheorghe Lucian,Haule, Kristjan,Kiryukhin, Valery,Yang, Junjie,Cheong, Sang-Wook,Wu, Weida,Bode, Matthias American Physical Society 2016 Physical Review B Vol.94 No.1
<P>We present a scanning tunneling microscopy (STM) study of the domain evolution across two first-order phase transitions of stripe modulations in IrTe2 that occur at T-C approximate to 275 K and T-S approximate to 180 K, respectively. Phase coexistence of the hexagonal (1 x 1) structure and the (5 x 1) stripe modulation is observed at TC, while various (p x 1) modulations (p = 3n + 2 with 2 <= n is an element of N) are observed below T-S. Using STM atomic resolution, we observe anisotropic propagation of domain boundaries along different directions, indicating significantly different kinetic energy barriers. These results are consistently explained by a theoretical analysis of the energy barrier for domain wall propagation as obtained by density functional theory. Individual switching processes observed by STM indicate that the wide temperature range of the transition from the (5 x 1) stripes to the (6 x 1)-ordered ground state is probably caused by the numerically limited subset of switching processes that are allowed between a given initial and the final state. The observations on IrTe2 are discussed in terms of a 'harmless staircase' with a finite number of first-order transitions between commensurate phases and within a 'dynamical freezing' scenario.</P>