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Politikberatung mit dem Simulationsmodell PACE-L
Full text linkPOLITIKBERATUNG MIT DEM SIMULATIONSMODELL PACE-L
Politikberatung mit dem Simulationsmodell PACE-L / Feil, Michael (Rights reserved) (-
Luigi Pace and Alessandra Salvan's contribution to the Discussion of 'Safe testing' by Grünwald, de Heide, and Koolen
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Tensors and likelihood expansions in the presence of nuisance parameters
No full textStochastic expansions of likelihood quantities are usually derived through ordinary Taylor expansions, rearranging terms according to their asymptotic order. The most convenient form for such expansions involves the score function, the expected information, higher order log-likelihood derivatives and their expectations. Expansions of this form are called expected/observed. If the quantity expanded is invariant or, more generally, a tensor under reparameterisations, the entire contribution of a given asymptotic order to the expected/observed expansion will follow the same transformation law. When there are no nuisance parameters, explicit representations through appropriate tensors are available. In this paper, we analyse the geometric structure of expected/observed likelihood expansions when nuisance parameters are present. We outline the derivation of likelihood quantities which behave as tensors under interest-respecting reparameterisations. This allows us to write the usual stochastic expansions of profile likelihood quantities in an explicitly tensorial form
Recent advances in fusion radioactive material studies
No full textThis paper focuses on a few recent advances and research developments concerning fusion radioactive waste management studies. In particular: the role of fusion power in the frame of the future production of nuclear radioactive waste, in terms of potential waste avoidance using a precautionary fusion waste management policy, activation of W and its alloys (examining and comparing the activation of W-based components in ITER, PPCS, and ARIES designs), development of a management strategy for activated materials from complex components (such as blanket and divertor), waste decay heat and maintenance questions, materials detritiation, and public acceptance of clearable and recyclable materials. © 2013 Elsevier B.V. All rights reserved
A CLASS OF TESTS FOR EXPONENTIALITY AGAINST MONOTONE FAILURE RATE ALTERNATIVES WITH INCOMPLETE DATA
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Conceptual design of the radial gamma ray spectrometers system for α particle and runaway electron measurements at ITER
No full textWe here present the principles and main physics capabilities behind the design of the radial gamma ray spectrometers (RGRS) system for alpha particle and runaway electron measurements at ITER. The diagnostic benefits from recent advances in gamma-ray spectrometry for tokamak plasmas and combines space and high energy resolution in a single device. The RGRS system as designed can provide information on α particles on a time scale of 1/10 of the slowing down time for the ITER 500 MW full power DT scenario. Spectral observations of the 3.21 and 4.44 MeV peaks from the 9Be(α, nγ)12C reaction make the measurements sensitive to α particles at characteristic resonant energies and to possible anisotropies of their slowing down distribution function. An independent assessment of the neutron rate by gamma-ray emission is also feasible. In case of runaway electrons born in disruptions with a typical duration of 100 ms, a time resolution of at least 10 ms for runaway electron studies can be achieved depending on the scenario and down to a current of 40 kA by use of external gas injection. We find that the bremsstrahlung spectrum in the MeV range from confined runaways is sensitive to the electron velocity space up to E≈30-40 MeV, which allows for measurements of the energy distribution of the runaway electrons at ITER. © 2017 IOP Publishing Ltd
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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