9,752 research outputs found
The Dilemma of Delegating Search: Budgeting in Public Employment Service
The Recent German research has suggested that extending the number of caseworkers may have a very positive effect on PES performance. The present paper accepts this key insight but argues that there are other factors that may independently drive outcomes and in particular local agentsâ discretion. That is, it focuses on the delegation problem between the central office and the local job center âmatchmakers.â Because their (search) effort in contacting employers and collecting data is not verifiable by the central authority, a typical moral hazard problem can arise. To overcome the delegation problem and provide highâpowered incentives for increased levels of search effort on the part of job centers, we propose outputârelated schemes that assign greater staff capacity to agencies achieving high strike rates.matching unemployment, public employment service, active labor market policy, moral hazard, search theory
The Dilemma of Delegating Search: Budgeting in Public Employment Services
The poor performance often attributed to many public employment services may be explained in part by a delegation problem between the central office and local job centers. In markets characterized by frictions, job centers function as match-makers, linking job seekers with relevant vacancies. Because their search intensity in contacting employers and collecting data is not verifiable by the central authority, a typical moral hazard problem can arise. To overcome the delegation problem and provide high-powered incentives for high levels of search effort on the part of job centers, we propose output-related schemes that assign greater staff capacity to agencies achieving high strike rates.matching unemployment, public employment service, delegation problem, moral hazard, search theory
Electroweak Sudakov Corrections and the Top Quark Forward-Backward Asymmetry
The Standard Model (SM) prediction of the top quark forward backward
asymmetry is shown to be slightly enhanced by a correction factor of 1.05 due
to electroweak Sudakov (EWS) logarithms of the form (\alpha/sin^2 \theta_W)^n
log^{m< 2n} (s/M_{W,Z}^2). The EWS effect on the dijet and t \bar{t} invariant
mass spectra is significant, reducing the SM prediction by ~20, 10 %
respectively for the highest invariant masses measured at the LHC, and changing
the shape of the high-mass tail of the spectrum. These corrections
significantly affect measurements of the top quark invariant mass spectrum and
the search for an excess of events related to the top quark forward-backward
asymmetry.Comment: 5 pages, 2 figure
Next generation design framework for the aircraft electric power system
Comprehensive understanding and analysis of the more
electric aircraft network architecture (MEA) usually require
a powerful simulation framework, which allows
modelling, simulation and post-processing of aircraft
electric power systems. Since the electric power network
in the MEA typically covers several physical domains
such as electrical systems, magnetic systems,
mechanical systems and control, a modelling language
to be selected for the design framework has to be capable
of modelling multi-domain systems. In this regard,
Modelica - an object oriented, equation based modelling
language has been chosen as a candidate for modelling
the extended electric network in JTI SGO project.
By hand of some study cases at supplier level and airframer
level, the capability of the Modelica technique
based design framework was tested, demonstrated and
improved. The selected applications are system specification,
component design and virtual testing, which are
associated to different phases of the design process for
the aircraft electric power system. Essential components
which were modelled are the generator, power converters
and electromechanical actuators. Modelica and the
simulation suite Dymola were demonstrated to fulfil all
stated demands
Atomic-scale measurement of ultraslow Li motions in glassy LiAlSi2 O6 by two-time L6 i spin-alignment echo NMR correlation spectroscopy
6Li spin-alignment echo (SAE) nuclear-magnetic-resonance (NMR) spectroscopy is used to monitor single-particle two-time correlation functions in LiAlSi2O6 glass. The method, here applied in the temperature range from 300 to 400 K, is sensitive to ultraslow Li hopping processes with rates (1/ĎSAE) down to 10 jumps/s. The use of a sample with natural 6Li abundance allowed the measurement of pure NMR spin-alignment echoes which are damped with increasing mixing time exclusively by slow Li jumps, i.e., free of influences arising from, e.g., interfering spin-diffusion effects. The considerably stretched correlation functions reveal the presence of a broad distribution of jump rates. The results are comprehensively compared with those recently obtained from both 7Li SAE and 7Li spin-lattice relaxation NMR as well as from dc conductivity measurements. Interestingly, the activation energy of the latter, which are sensitive to long-range Li transport parameters, is in good agreement with that microscopically probed by 6Li SAE NMR, here. Š 2008 The American Physical Society
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