2,972 research outputs found
Alien Registration- Bernier, Rodolphe E. (Lewiston, Androscoggin County)
https://digitalmaine.com/alien_docs/30315/thumbnail.jp
Design study for LANDSAT D attitude control system
A design and performance evaluation is presented for the LANDSAT D attitude control system (ACS). Control and configuration of the gimballed Ku-band antenna system for communication with the tracking and data relay satellite (TDRS). Control of the solar array drive considered part of the ACS is also addressed
Attachment working models as unconscious structures: An experimental test
Internal working models of attachment (IWMs) are presumed to be largely unconscious representations of childhood attachment experiences. Several instruments have been developed to assess IWMs; some of them are based on self-report and others on narrative interview techniques. This study investigated the capacity of a self-report measure, the Inventory of Parent and Peer Attachment (IPPA; Armsden & Greenberg, 1987), and of a narrative interview method, the Adult Attachment Interview (AAI; George, Kaplan, & Main, 1985), to measure unconscious attachment models. We compared scores on the two attachment instruments to response latencies in an attachment priming task. It was shown that attachment organisation assessed by the AAI correlates with priming effects, whereas the IPPA scales were inversely or not related to priming. The results are interpreted as support for the assumption that the AAI assesses, to a certain degree, unconscious working models of attachment
Quantum order by disorder in frustrated diamond lattice antiferromagnets
We present a quantum theory of frustrated diamond lattice antiferromagnets.
Considering quantum fluctuations as the predominant mechanism relieving spin
frustration, we find a rich phase diagram comprising of six phases with
coplanar spiral ordering in addition to the N\'eel phase. By computing the
specific heat of these ordered phases, we obtain a remarkable agreement between
-spiral ordering and the experimental specific heat data for the
diamond lattice spinel compounds MnScS, CoO and CoRhO,
i.e. specific heat data is a strong evidence for -spiral ordering in
all of these materials. This prediction can be tested in future neutron
scattering experiments on CoO and CoRhO, and is consistent with
existing neutron scattering data on MnScS. Based on this agreement we
infer a monotonically increasing relationship between frustration and the
strength of quantum fluctuations.Comment: 4 pages, 2 figures, version published in PR
Design study for LANDSAT-D attitude control system
The gimballed Ku-band antenna system for communication with TDRS was studied. By means of an error analysis it was demonstrated that the antenna cannot be open loop pointed to TDRS by an onboard programmer, but that an autotrack system was required. After some tradeoffs, a two-axis, azimuth-elevation type gimbal configuration was recommended for the antenna. It is shown that gimbal lock only occurs when LANDSAT-D is over water where a temporary loss of the communication link to TDRS is of no consequence. A preliminary gimbal control system design is also presented. A digital computer program was written that computes antenna gimbal angle profiles, assesses percent antenna beam interference with the solar array, and determines whether the spacecraft is over land or water, a lighted earth or a dark earth, and whether the spacecraft is in eclipse
Détection et Reconnaissance des Gestes Emblématiques
Session "Atelier IHMA"National audienceDans cette contribution, nous présentons un système de reconnaissance en ligne de gestes emblématiques et son utilisation pour le contrôle d'un robot mobile. Ce système comporte quatre sous-systèmes : un premier qui permet de détecter la personne et d'extraire les mouvements de la partie supérieure de cette personne. Un second, permet d'isoler les mouvements, une troisième permet de reconnaître un des mouvements appris a priori. Enfin le dernier module, traduit les mouvements reconnus en termes de contrôle d'un robot mobile à roues. Dans notre approche, nous avons surtout traité du problème de la généralisation : faire l'apprentissage sur une base réduite de personnes et utiliser cette connaissance pour reconnaître n'importe quelle personne, indépendamment de sa morphologie, de son âge, de son sexe et de son positionnement par rapport au capteur. Nous détaillons les résultats obtenus pour la reconnaissance ainsi que l'utilisation du système dans des scenarios de contrôle d'un robot
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