Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailAnticipatory Artificial Autopoiesis
Dubois, Daniel ULg; Holmberg, Stig C.

in Trappl, Robert (Ed.) CYBERNETICS AND SYSTEMS 2010 (2010)

In examining relationships between autopoiesis and anticipation in artificial life (Alife) systems it is demonstrated that anticipation may increase efficiency and viability in artificial autopoietic ... [more ▼]

In examining relationships between autopoiesis and anticipation in artificial life (Alife) systems it is demonstrated that anticipation may increase efficiency and viability in artificial autopoietic living systems. This paper, firstly, gives a review of the Varela et al [1974] automata algorithm of an autopoietic living cell. Some problems in this algorithm must be corrected. Secondly, a new and original anticipatory artificial autopoiesis algorithm for automata is presented. In our automata system, the asymmetric membrane of the self-creating living cell plays a central role. The simulation confirms the validity of our algorithm in showing its autopoietic properties. [less ▲]

Detailed reference viewed: 74 (3 ULg)
Peer Reviewed
See detailAnticipatory Mechanisms in Evolutionary Living Systems
Dubois, Daniel ULg; Holmberg, Stig C.

in Dubois, Daniel (Ed.) COMPUTING ANTICIPATORY SYSTEMS (2010)

This paper deals firstly with a revisiting of Darwin's theory of Natural Selection. Darwin in his book never uses the word “evolution”, but shows a clear position about mutability of species. Darwin's ... [more ▼]

This paper deals firstly with a revisiting of Darwin's theory of Natural Selection. Darwin in his book never uses the word “evolution”, but shows a clear position about mutability of species. Darwin's Natural Selection was mainly inspired by the anticipatory Artificial Selection by humans in domestication, and the Malthus struggle for existence. Darwin showed that the struggle for existence leads to the preservation of the most divergent offspring of any one species. He cited several times the canon of “Natura non facit saltum”. He spoke about the origin of life from some one primordial form, into which life was first breathed. Finally, Darwin made anticipation about the future researches in psychology. This paper cites the work of Ernst Mayr who was the first, after 90 years of an intense scientific debate, to present a new and stable Darwinian paradigm as the “Evolutionary Synthesis” in 1942. To explain what is life, the Living Systems Theory (LST) by J. G. Miller is presented. It is showed that the Autopoietic Systems Theory of Varela et al is also a fundamental component of living systems. In agreement with Darwin, the natural selection is a necessary condition for transformation of biological systems, but is not a sufficient condition. Thus, in this paper we conjecture that an anticipatory evolutionary mechanism exists with the genetic code that is a self-replicating and self-modifying anticipatory program. As demonstrated by Nobel laureate McClintock, evolution in genomes is programmed. The word “program” comes from “pro-gram” meaning to write before, by anticipation, and means a plan for the programming of a mechanism, or a sequence of coded instructions that can be inserted into a mechanism, or a sequence of coded instructions, as genes of behavioural responses, that is part of an organism. For example, cell death may be programmed by what is called the apoptosis. This definitively is a great breakthrough in our understanding of biological evolution. Hence, it is possible to formulate a new principle of evolution, i.e. the principle of Double Anticipatory Loop (DAL) of evolution: Biological evolution is driven by interaction between a mindless environment that is passively selecting the fittest inhabitants and purposeful anticipatory living systems, which are actively selecting and creating their own environment. Evolution on the genome level is trigged by environmental stress but guided by an inherent program. [less ▲]

Detailed reference viewed: 54 (2 ULg)
Full Text
Peer Reviewed
See detailAnticipatory Modeling and Simulation for Inter Regional Security
Dubois, Daniel ULg; Asproth, Viveca; Stig C, Holmberg et al

Conference (2012, April)

Detailed reference viewed: 51 (4 ULg)
Full Text
Peer Reviewed
See detailAnticipatory responding, exclusive drug-context pairing and conditioned effects in sensitization to apomorphine-induced climbing in mice
Tirelli, Ezio ULg; Heidbreder, C.

in Progress in Neuro-Psychopharmacology & Biological Psychiatry (1999), 23(3), 505-518

1. The conditioning aspects of contextual sensitization were examined in the case of apomorphine-induced wall-climbing in mice, measuring onset latencies of the pharmacological response and controlling ... [more ▼]

1. The conditioning aspects of contextual sensitization were examined in the case of apomorphine-induced wall-climbing in mice, measuring onset latencies of the pharmacological response and controlling differential habituation to the test context during drug treatment. 2. Sensitization was generated in male out-bred mice which received intermittent i.p. injections of 0.4 mg/kg apomorphine over 9 daily sessions. On day 10, they were tested for contextual sensitization (all mice under apomorphine). On day 14, after 3 sessions of reinstatement, mice were tested for conditioned climbing (all mice under saline). 3. It was found that simultaneous exposure to both apomorphine and the test context facilitated the expression of a full-blown contextual sensitization (some non-contextual sensitization emerging too); importantly, sensitization was accompanied by a progressive shortening of the latencies to climb (before injections); conditioned climbing appeared only in mice pairing the drug with the test context, that response being absent in mice treated outside the context or never exposed to the context. 4. It is likely that contextual sensitization to apomorphine-induced climbing relies on Pavlovian conditioning processes rather than on habituation-related processes. [less ▲]

Detailed reference viewed: 89 (1 ULg)
Full Text
See detailAnticiper et déjouer les pièges de l'analyse qualitative
Lejeune, Christophe ULg

Scientific conference (2015, January 26)

Detailed reference viewed: 29 (6 ULg)
Full Text
See detailAnticiper les migrations climatiques
Gemenne, François ULg; Ozer, Pierre ULg

Article for general public (2014)

Detailed reference viewed: 63 (4 ULg)
See detailAnticiper pour s’adapter. Le nouvel enjeu du changement climatique.
Tubiana, Laurence; Gemenne, François ULg; Magnan, Alexandre

Book published by Pearson (2010)

Detailed reference viewed: 34 (9 ULg)
Full Text
Peer Reviewed
See detailAnticoagulants oraux : nouveaux horizons
PETERS, Pierre ULg; DEFRAIGNE, Jean ULg; GOTHOT, André ULg

in Revue Médicale de Liège (2012), 67

Detailed reference viewed: 59 (8 ULg)
Full Text
Peer Reviewed
See detailL'anticoagulation de l'hémofiltration continue: Citrate versus Héparine
Damas, Pierre ULg; Krzesinski, Jean-Marie ULg

in Revue Médicale de Liège (2007), 62

L'insuffisance rénale aiguë aux Soins Intensifs affecte un patient sur cinq et souvent nécessite le recours à une épuration extra-rénale. L'hémofiltration continue est choisie pour certains patients ... [more ▼]

L'insuffisance rénale aiguë aux Soins Intensifs affecte un patient sur cinq et souvent nécessite le recours à une épuration extra-rénale. L'hémofiltration continue est choisie pour certains patients (instabilité hémodynamique, neurologique, mais nécessite, comme d'ailleurs l'hémodialyse, une anticoagulation. Le citrate, utilisé dans le travail publié, est sorti vainqueur de sa comparaison avec l'héparine non fractionnée. Son utilisation nécessite cependant une surveillance attentive. [less ▲]

Detailed reference viewed: 190 (3 ULg)
Full Text
See detailL'anticoagulation en hémodialyse
Krzesinski, Jean-Marie ULg; Rorive, Georges ULg

in Néphrologie, Dialyse et Transplantation (1993)

Detailed reference viewed: 56 (0 ULg)
Full Text
Peer Reviewed
See detailANTICOAGULATION FOR GERIATRIC PATIENTS WITH ATRIAL FIBRILLATION
DOUPAGNE, G; Petermans, Jean ULg

in NPG. Neurologie - Psychiatrie - Gériatrie (2012), 12

À partir de deux cas cliniques fréquemment rencontrés dans la pratique gériatrique, nous avons revu les indications de prescription d’anticoagulants et leurs applications dans la population gériatrique ... [more ▼]

À partir de deux cas cliniques fréquemment rencontrés dans la pratique gériatrique, nous avons revu les indications de prescription d’anticoagulants et leurs applications dans la population gériatrique. La décision d’instaurer un traitement anticoagulant chez une personne âgée est grave, les conséquences pouvant en effet être importantes. Le risque hémorragique doit être mis en balance avec le risque embolique. L’un comme l’autre peut précipiter la dégradation physique et cognitive et altérer fortement la qualité de vie. De nombreux facteurs doivent être pris en considération. Même si l’utilisation des scores de risque doit être conseillée, l’importance du travail d’équipe, de l’évaluation des fonctions cognitives et de la communication entre les intervenants médicaux et paramédicaux permettent de bien cerner le profil du patient. Le rôle du médecin généraliste est également important dans la surveillance de l’INR, même si l’arrivée des nouveaux anticoagulants ne nécessitant pas de suivi biologique résoudra peut-être une partie du problème de la surveillance thérapeutique. Toutefois, l’utilisation de ce traitement chez les personnes âgées les plus vulnérables nécessitera toujours une grande prudence. L’absence de recommandations claires pour les patients âgés en fibrillation auriculaire nécessite souvent des décisions au cas par cas. [less ▲]

Detailed reference viewed: 60 (16 ULg)
Full Text
See detailAnticoherence and entanglement of spin states
Martin, John ULg; Baguette, Dorian ULg; Damanet, François ULg et al

Scientific conference (2016, March 02)

We investigate multiqubit permutation-symmetric states with maxi- mally mixed reduced density matrices in the symmetric subspace [1]. Such states can be viewed as particular spin states, namely anticoher ... [more ▼]

We investigate multiqubit permutation-symmetric states with maxi- mally mixed reduced density matrices in the symmetric subspace [1]. Such states can be viewed as particular spin states, namely anticoher- ent spin states [2]. Using the Majorana representation of spin states in terms of points on the unit sphere [3], we analyze the consequences of degeneracies of the Majorana points and of a point-group symmetry in their arrangement on the existence of anticoherent spin states. We provide different characterizations of anticoherence and establish a link between point symmetries, anticoherence, and SLOCC classes [4]. We consider in detail the case of small numbers of qubits and solve the 4-qubit case completely by identifying and characterizing all 4-qubit anticoherent states. [1] D. Baguette, T. Bastin, and J. Martin, Phys. Rev. A 90, 032314 (2014); O. Giraud et al., Phys. Rev. Lett. 114, 080401 (2015); D. Baguette et al., Phys. Rev. A 92, 052333 (2015). [2] J. Zimba, Electron. J. Theor. Phys. 3, 143 (2006). [3] E. Majorana, Nuovo Cimento 9, 43 (1932). [4] SLOCC classes : Classes of states equivalent through stochastic local operations with classical communication. [less ▲]

Detailed reference viewed: 63 (9 ULg)
Full Text
Peer Reviewed
See detailAnticoherence measures for spin states
Baguette, Dorian ULg; Martin, John ULg

Poster (2017, March 09)

Among all possible spin states, spin-coherent states are the most classical because the spin expectation value in these states yields a vector of maximal norm pointing in a well defined direction. In ... [more ▼]

Among all possible spin states, spin-coherent states are the most classical because the spin expectation value in these states yields a vector of maximal norm pointing in a well defined direction. In contrast, anticoherent spin state to order t are such that <(J.n)^k> is independent of the unit vector n for k = 1, ..., t [1]. By construction, coherent and anticoherent spin states are at both ends of the spectrum of classicality. The aim of this work is to position all possible spin states on such a spectrum, that is to provide measures of anticoherence. To this aim, we introduce an axiomatic definition of anticoherence measures to any order t. In particular, we show that the total variance of a pure spin state, first introduced in [2] can be used to define a measure of anticoherence to order 1. We describe a systematic way of constructing anticoherence measures to any order that relies on the mapping between spin-j states and symmetric states of N = 2j spin-1/2. In particular, we exploit the fact that anticoherent spin states to order t have maximally mixed t-spin-1/2 reduced density matrices in the symmetric subspace [3]. [1] J. Zimba, Electron. J. Theor. Phys. 3, 143 (2006). [2] A. A. Klyachko, B. Öztop, and A. S. Shumovsky, Phys. Rev. A 75, 032315 (2007). [3] D. Baguette, T. Bastin, and J. Martin, Phys. Rev A 90, 032314 (2014). [less ▲]

Detailed reference viewed: 23 (6 ULg)
Full Text
See detailAnticoherence of multiqubit symmetric states
Baguette, Dorian ULg; Bastin, Thierry ULg; Martin, John ULg

Conference (2015, May 13)

Detailed reference viewed: 40 (3 ULg)
Full Text
Peer Reviewed
See detailAnticoherence of spin states with point-group symmetries
Baguette, Dorian ULg; Damanet, François ULg; Giraud, Olivier et al

Poster (2016, May 18)

Detailed reference viewed: 36 (10 ULg)
Full Text
Peer Reviewed
See detailAnticoherence of spin states with point-group symmetries
Baguette, Dorian ULg; Damanet, François ULg; Giraud, Olivier et al

Poster (2016, March 02)

We investigate multiqubit permutation-symmetric states with maximal entropy of entanglement. Such states can be viewed as particular spin states, namely anticoherent spin states. Using the Majorana ... [more ▼]

We investigate multiqubit permutation-symmetric states with maximal entropy of entanglement. Such states can be viewed as particular spin states, namely anticoherent spin states. Using the Majorana represen- tation of spin states in terms of points on the unit sphere, we analyze the consequences of a point-group symmetry in their arrangement on the quantum properties of the corresponding state [1]. We focus on the identi cation of anticoherent states (for which all reduced density matrices in the symmetric subspace are maximally mixed) associated with point-group-symmetric sets of points. We provide three di erent characterizations of anticoherence and establish a link between point symmetries, anticoherence, and classes of states equivalent through stochastic local operations with classical communication. We then in- vestigate in detail the case of small numbers of qubits and construct in nite families of anticoherent states with point-group symmetry of their Majorana points, showing that anticoherent states do exist to arbitrary order. [1] D. Baguette et al., Phys. Rev. A 92, 052333 (2015). [less ▲]

Detailed reference viewed: 22 (7 ULg)
Full Text
Peer Reviewed
See detailAnticoherence of spin states with point-group symmetries
Baguette, Dorian ULg; Damanet, François ULg; Giraud, Olivier et al

in Physical Review A (2015), 92

We investigate multiqubit permutation-symmetric states with maximal entropy of entanglement. Such states can be viewed as particular spin states, namely anticoherent spin states. Using the Majorana ... [more ▼]

We investigate multiqubit permutation-symmetric states with maximal entropy of entanglement. Such states can be viewed as particular spin states, namely anticoherent spin states. Using the Majorana representation of spin states in terms of points on the unit sphere, we analyze the consequences of a point-group symmetry in their arrangement on the quantum properties of the corresponding state. We focus on the identification of anticoherent states (for which all reduced density matrices in the symmetric subspace are maximally mixed) associated with point-group-symmetric sets of points. We provide three different characterizations of anticoherence and establish a link between point symmetries, anticoherence, and classes of states equivalent through stochastic local operations with classical communication. We then investigate in detail the case of small numbers of qubits and construct infinite families of anticoherent states with point-group symmetry of their Majorana points, showing that anticoherent states do exist to arbitrary order. [less ▲]

Detailed reference viewed: 36 (6 ULg)
Peer Reviewed
See detailAnticonvulsant properties of 4-cycloalkylamino-pyrid-3-yl sulfonylureas and -thioureas
Masereel, B.; Lambert, D.; Bia, F. et al

in Journal de Pharmacie de Belgique (1996), 51

Detailed reference viewed: 10 (2 ULg)
Peer Reviewed
See detailAnticonvulsant properties of 4-cycloalkylamino-pyrid-3-yl sulfonylureas and -thioureas
Masereel, B.; Lambert, D.; Bia, F. et al

Poster (1995, June)

Detailed reference viewed: 2 (0 ULg)