2,392 research outputs found
Jet Results in pp and Pb-Pb Collisions at ALICE
We report results on jet production in pp and Pb-Pb collisions at the LHC
from the ALICE collaboration. The jet cross section in pp collisions at
=2.76 TeV is presented, as well as the charged particle jet
production cross section and measurements of the jet fragmentation and jet
shape in pp collisions at =7 TeV. NLO pQCD calculations and
simulations from MC event generators agree well with the data. Measurements of
jets with a resolution parameter =0.2 in Pb-Pb collisions at
=2.76 TeV show a strong, momentum dependent suppression in
central events with respect to pp collisions. The centrality dependence of the
suppression of charged particle jets relative to peripheral events is
presented. The ratio of jet spectra with =0.2 and =0.3 is found to be
similar in pp and Pb-Pb events. The analysis of the semi-inclusive distribution
of charged particle jets recoiling from a high- trigger hadron
allows an unbiased measurement of the jet structure for larger cone radii.Comment: 4 pages, 3 figures, to appear in the proceedings of the 48th
Rencontres de Moriond, La Thuile, Italy, March 9-16, 201
When Have All the Graduates Gone?: Internal Cross-State Migration of Graduates in Germany 1984-2004
The present paper analyzes the out-migration of graduates to other German states or abroad based on the German Socio-Economic Panel (GSOEP). Applying duration analysis, it can be shown that, ten years after graduation, slightly more than seventy percent of the graduates still live in the state where they completed their studies. The parametric estimation model identifies personal characteristics that are highly correlated with out-migration and permanent residence respectively. The analysis confirms previous results that nonresident students exhibit a significantly higher emigration propensity than resident fellows.Brain drain, nonresident students, fiscal externalities, duration analysis, GSOEP
Wie groĂ ist der Brain Drain innerhalb von Deutschland?
Der innerdeutsche Brain Drain, also die Abwanderung von Akademikern in andere Bundesländer, nimmt bisher ein moderates AusmaĂ an. Zehn Jahre nach Studienabschluss sind noch knapp Ăźber 70 % aller Absolventen im Bundesland ihres Studiums ansässig. Die Daten zeigen ferner, dass ein Wegzug, wenn er Ăźberhaupt stattfindet, in den ersten Jahren direkt nach Studienabschluss vollzogen wird. Je länger ein Absolvent bereits vor Ort verblieben ist, umso geringer ist die Wahrscheinlichkeit fĂźr einen späteren Wegzug. Speziell fĂźr Ostdeutschland besteht Anlass zu verhaltenem Optimismus. Die ostdeutschen Bundesländer erweisen sich als attraktive Studienorte, die talentierte junge Menschen von auĂerhalb anziehen. Wenn es gelingt, diese zukĂźnftigen Absolventen auch im Lande zu halten, kann dies das Humankapital vor Ort und damit das Wirtschaftswachstum erhĂśhen.Humankapital; Brain Drain; Wissenstransfer; Wirtschaftswachstum; Deutschland; Neue Bundesländer
A Study of an Intra-Organizational Stratification System Viewed as a Network of Social Distance Strategies about a Set of Fixed Positions
It is generally agreed that in a generic sense the concept social stratification refers to a structure of differential rankings which seems to occur in all societies. That is a structure exists of regularized inequality in which men are ranked higher and lower according to the value accorded their various social roles and activities through the process of self-and-other differentiation and ranking
Orbital Hall effect and orbital edge states caused by s electrons
An orbital current can be generated whenever an object has a translational
and rotational degree of freedom. In condensed matter physics, intra-atomic
contributions to the transverse orbital transport, labeled orbital Hall effect,
rely on propagating wave packets that must consist of hybridized atomic
orbitals. However, inter-atomic contributions have to be considered as well
because they give rise to a new mechanism for generating orbital currents. As
we show, even wave packets consisting purely of s electrons can transport
orbital angular momentum if they move on a cycloid trajectory. We introduce the
kagome lattice with a single s orbital per atom as the minimal model for the
orbital Hall effect and observe the cycloid motion of the electrons in the
surface states.Comment: 6 pages, 4 figure
Towards Shaping the Software Lifecycle with Methods and Practices
As software projects are very diverse, each software development process must
be adjusted to the needs of the project and the corresponding development team.
Frequently, we find different methods and practices combined in a so-called
hybrid development method. Research has shown that these hybrid methods evolve
over time and are devised based on experience. However, when devising a hybrid
method, the methods and practices used should cover the whole software project
with its different phases including, among others, project management,
requirements analysis, quality management, risk management, and implementation.
In this paper, we analyze which methods and practices are used in which phase
of a software project. Based on an initial survey with 27 practitioners, we
provide a mapping of methods and practices to different project phases and vice
versa. Despite the preliminary nature of our study and the small sample size,
we observe three remarkable aspects: (1) there are discrepancies between the
intended use of methods and practices according to literature and the real use
in practice, (2) practices are used more consistently than methods, and (3)
parts of the software lifecycle such as maintenance and evolution are hardly
covered by widely distributed methods and practices. Consequently, when
devising a development process, it is worth a thought whether all phases of the
software lifecycle are addressed or not.Comment: Accepted for publication at the Joint 15th International Conference
on Software and System Processes (ICSSP) and 16th ACM/IEEE International
Conference on Global Software Engineering (ICGSE
Ultrafast spin dynamics: complementing theoretical analyses by quantum-information measures
Theoretical analyses of ultrafast spin dynamics commonly address and discuss
simulated phenomena by means of observables, whereas in quantum information
theory one often utilizes measures of quantum states. In this Paper we report
on possible benefits of quantum information measures in simulations of
ultrafast spin dynamics. For Co/Cu heterostructures illuminated by femtosecond
laser pulses, we discuss the general behaviour of quantum information measures,
in particular distances in Hilbert space and degrees of mixing in the density
matrix. The measures are in particular sensitive to variations of the
polarization of a laser pulse and the sample composition. Moreover, they are
closely related to magnetization and number of excited electrons
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