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Search Results: 1 - 10 of 4670 matches for " Catherine Hellemans "
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L’incertitude per ue dans la réalisation des taches chez les travailleurs suite aux réformes de la fonction publique
Cécile Van?de?Leemput,Catherine Hellemans,Barbara Lapthorn
Pyramides : Revue du Centre d'Etudes et de Recherches en Administration Publique , 2012,
Abstract: La recherche s’est intéressée à la manière dont les fonctionnaires de deux Directions d’un Service Public Fédéral belge (n = 112) per oivent et vivent au quotidien les modifications induites par le plan de réforme Copernic. Sur la base de questionnaires fermés, les analyses ont pu montrer un impact manifeste du changement sur la perception d’incertitudes pesant sur le travail. Cet impact concerne la justice per ue lors du changement, l’efficacité per ue du changement, ainsi que la qualité de vie au travail per ue suite au changement. Ces dimensions contribuent à influencer le travailleur placé dans un contexte de transformation organisationnelle, et à l’aider à maintenir ou non un niveau supportable de perception d’incertitude.
H. Piersma, Mensenheugenis. Terugkeer en opvang na de Tweede Wereldoorlog. Getuigenissen
M. Bossenbroek, De meelstreep. Terugkeer en opvang na de Tweede Wereldoorlog
C. Kristel, Binnenskamers. Terugkeer en opvang na de Tweede Wereldoorlog. Besluitvorming
C. Kristel, Polderschouw. Terugkeer en opvang na de Tweede Wereldoorlog. Regionale verschillen

Hanne Hellemans
BMGN : Low Countries Historical Review , 2005,
Effet du couvert forestier sur la précision d'un système de positionnement global différentiel
Lejeune P.,Hellemans P.
Biotechnologie, Agronomie, Société et Environnement , 2000,
Abstract: Effect of forest canopy on the accuracy of a differential global positioning system (dGPS). The possibilities to use dGPS (differential global positioning system) for forest mapping are analyzed. The efficiency of dGPS in forest condition is linked to canopy interference, which intercepts signals sent by some of the satellites or reflect them (multipathing). Two types of equipment have been tested: a Trimble Svee Six coupled with a RDS differential receiver and a Trimble SK8 coupled with an OMNISTAR differential receiver. Recordings have been achieved according to two modes: static (recording on one spot during one minute) and cinematic (moving continuously along the stand limits). Two types of forest canopy were compared: light canopy made of young poplar plantation with few obstacles in the vicinity, and closed canopy of mature spruce stand edged with other mature stand. Cinematic mode efficiency is higher than static one (mean errors are respectively 3.1 m and 9.1 m). In the same way positioning is more accurate for the stand with light canopy than for the other one (mean errors are respectively 2.9 m and 9.4 m). Difference between recording modes are probably due to multipathing effect that filtering algorithm integrated in the GPS receivers are not able to remove in static mode. The efficiency of differential signal reception is also different for the two stands: 1.3/ and 20.5/ of missing differential signal respectively in the light and dense canopy conditions.
Autism and X-linked hypophosphatemia: A possible association?
Joel Vermeersch,Hans Hellemans,Dirk Deboutte
Indian Journal of Human Genetics , 2010,
Abstract: We herein report the joint occurrence of an autistic disorder (AD) and X-linked hypophosphatemia. X-linked hypophosphatemia (XLH), an X-linked dominant disorder, is the most common of the inherited renal phosphate wasting disorders. Autism is a pervasive developmental disorder that occurs mainly due to genetic causes. In approximately 6-15% of cases, the autistic phenotype is a part of a broader genetic condition called syndromic autism. Therefore, reports of cases with the joint occurrence of a known genetic syndrome and a diagnosis of ASD by a child psychiatrist are relevant. A joint occurrence does not, however, mean that there is always a causal link between the genetic syndrome and the autistic behavioural phenotype. In this case, there are a number of arguments countering a causal link.
The quadrupole collective model from a Cartan-Weyl perspective
Stijn De Baerdemacker,Kris Heyde,Veerle Hellemans
Physics , 2007, DOI: 10.1088/1751-8113/41/30/304039
Abstract: The matrix elements of the quadrupole variables and canonic conjugate momenta, emerging from collective nuclear models are calculated within a $SU(1,1)\times O(5)$ basis. Using a harmonic oscillator implementation of the SU(1,1) degree of freedom, it can be shown that the matrix elements of the quadrupole phonon creation and annihilation operators can be calculated in a pure algebraic way, making use of an intermediate state method.
Spectral properties of a tractable collective Hamiltonian
S. De Baerdemacker,K. Heyde,V. Hellemans
Physics , 2008, DOI: 10.1103/PhysRevC.79.034305
Abstract: The spectral properties of a tractable collective model Hamiltonian are studied. The potential energy is truncated up to quartic terms in the quadrupole deformation variables, incorporating vibrational, $\gamma$-independent rotational and axially deformed rotational structures. These physically significant limits are analysed in detail and confronted with well-established approximation schemes. Furthermore, transitional Hamiltonians in between the limits are presented and discussed. All results are obtained within a recently presented Cartan-Weyl based framework to calculate $SU(1,1)\times SO(5)$ embedded quadrupole collective observables.
Configuration mixing in the neutron-deficient $^{186-196}$Pb isotopes
V. Hellemans,S. De Baerdemacker,K. Heyde
Physics , 2008, DOI: 10.1103/PhysRevC.77.064324
Abstract: In this article we report the results of detailed interacting boson model calculations with configuration mixing for the neutron-deficient Pb isotopes. Calculated energy levels and $B(E2)$ values for $^{188-196}$Pb are discussed and some care is suggested concerning the current classification on the basis of level systematics of the $4_1^+$ and $6_1^+$ states in $^{190-194}$Pb. Furthermore, quadrupole deformations are extracted for $^{186-196}$Pb and the mixing between the different families (0p-0h, 2p-2h, and 4p-4h) is discussed in detail. Finally, the experimental and the theoretical level systematics are compared.
The tensor part of the Skyrme energy density functional. III. Time-odd terms at high spin
V. Hellemans,P. -H. Heenen,M. Bender
Physics , 2011, DOI: 10.1103/PhysRevC.85.014326
Abstract: This article extends previous studies on the effect of tensor terms in the Skyrme energy density functional by breaking of time-reversal invariance. We have systematically probed the impact of tensor terms on properties of superdeformed rotational bands calculated within the cranked Hartree-Fock-Bogoliubov approach for different parameterizations covering a wide range of values for the isoscalar and isovector tensor coupling constants. We analyze in detail the contribution of the tensor terms to the energies and dynamical moments of inertia and study their impact on quasi-particle spectra. Special attention is devoted to the time-odd tensor terms, the effect of variations of their coupling constants and finite-size instabilities.
Quadrupole collective variables in the natural Cartan-Weyl basis
S. De Baerdemacker,K. Heyde,V. Hellemans
Mathematics , 2007, DOI: 10.1088/1751-8113/40/11/009
Abstract: The matrix elements of the quadrupole collective variables, emerging from collective nuclear models, are calculated in the natural Cartan-Weyl basis of O(5) which is a subgroup of a covering $SU(1,1)\times O(5)$ structure. Making use of an intermediate set method, explicit expressions of the matrix elements are obtained in a pure algebraic way, fixing the $\gamma$-rotational structure of collective quadrupole models.
The Relationship between Energy Literacy and Environmental Sustainability  [PDF]
Catherine Dwyer
Low Carbon Economy (LCE) , 2011, DOI: 10.4236/lce.2011.23016
Abstract: Sustainability, first identified as a characteristic of eco-systems, is the capacity to maintain a process indefinitely. Environmental sustainability receives significant public and government attention, triggered by concerns about climate change, decreasing energy supplies, and increasing food costs. Colleges and universities receive positive notice for their greening efforts, and the academy is expected to be a leader in efforts to improve sustainability. Therefore coursework and curricula must be developed to train students about sustainable resource consumption processes. This paper describes curricula materials related to energy literacy, defined as conceptual fluency with the economic and social components of energy use. These materials were developed and piloted over a three year period, and were tested with a pre- and post-course survey administered with questions based on the New Environmental Paradigm (NEP) and Environmentally Responsible Behavior (ERB). The findings of this study suggest that discussion of sustainability with disaster themes triggers anxiety that interferes with the development of ERB. In contrast, materials emphasizing the pragmatic necessity and benefits derived from sustainable practices relate to improvements in ERB. This suggests sustainability curricula should mitigate anxiety aroused by the topic, and instead emphasize pragmatic motivations for changing energy consumption patterns.
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