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Items from 1 to 20 out of 2,476 results

article

Optimisation de l’IRM de diffusion en imagerie cancérologique corps entier

A. Luciani, S. Mulé, A. Vignaud, A. Rahmouni

Journal d'imagerie diagnostique et interventionnelle > 2017 > 1 > S > S26-S32

Diffusion weighted imaging (DWI) is now crucial for many diagnostic imaging strategies. Initially developed and applied to the study of the brain, DWI is now routinely used for whole body imaging, both for the optimization of lesion detection and of functional response to treatment. So let us now take 15 minutes to better understand the physical principles of DWI. How can we limit image artifacts...

article

The nature of the systematic radiometric error in the MGS TES spectra

Alexey A. Pankine, A.A. Pankine

Planetary and Space Science > 2015 > 109-110 > Complete > 64-75

Several systematic radiometric errors are known to affect the data collected by the Thermal Emission Spectrometer (TES) onboard Mars Global Surveyor (MGS). The time-varying wavenumber dependent error that significantly increased in magnitude as the MGS mission progressed is discussed in detail. This error mostly affects spectra of cold (nighttime and polar caps) surfaces and atmospheric spectra in...

article

Polityka jako przedmiot badań w realiach instrumentalizacji politologicznego rozumu

Artur Laska

Przegląd Politologiczny > 2014 > 4 > 143-157

Artykuł składa się z dwóch części. W pierwszej, autor prezentuje specyfikę dyscypliny nauk o polityce, ze szczególnym uwzględnieniem subdyscypliny: teoria polityki. Dokonuje diagnozy ich współczesnej kondycji – szczególnie w polskim kontekście. Wysuwa tezę o instrumentalizacji politologii. Wskazuję, iż jeśli głównym przedmiotem jej badań jest polityka, to badacze nie powinni stronić od prób jej zdefiniowania...

article

In vessel detection of delayed neutron emitters from clad failure in sodium cooled nuclear reactors: Information treatment

P. Filliatre, C. Jammes, J.-P. Jeannot, F. Jadot, more

Annals of Nuclear Energy > 2014 > 65 > Complete > 385-389

With appropriate techniques, the information brought by the in-vessel instrumentation of nuclear reactors may betray rather subtle departures from normal state indicating an abnormal situation at early stages, to improve both safety and availability. This paper takes the case of the detection of delayed neutrons released by a clad failure in sodium-cooled fast neutron reactors as an illustrative application...

article

Ecological interface design and sensor noise

Olivier St-Cyr, Greg A. Jamieson, Kim J. Vicente, O. St-Cyr, more

International Journal of Human - Computer Studies > 2013 > 71 > 11 > 1056-1068

This paper investigates the effects of the presence and magnitude of sensor noise on operators' performance and control stability when they use an Ecological Interface Design (EID) interface and a non-EID interface. Sensor noise was gradually increased in selected low-level physical sensors of DURESS III, a representative thermal-hydraulic process simulation. There are two important findings. First,...

article

The multi-wavelength context in 2015 and beyond

Jochen Greiner, Arne Rau

Comptes rendus - Physique > 2011 > 12 > 3 > 226-233

We collect information as complete as possible about the upcoming telescopes and facilities relevant to gamma-ray bursts, both in the electromagnetic bands as well as for non-electromagnetic messengers. We describe the expected synergy between these new facilities and the SVOM mission and predict possible progress in the field of gamma-ray bursts over the next years.

article

TIC, TAC, TOC, TED et THADA : la fonction et le fonctionnement

F. Joly

Neuropsychiatrie de l'enfance et de l'adolescence > 2010 > 58 > 6-7 > 379-390

Si la psychologie et la psychiatrie de l’enfant doivent d’évidence intégrer très naturellement les apports récents des neurosciences et des perspectives cognitives et fonctionnelles dans leurs modes de compréhension de la souffrance de l’enfant dans toutes ses dimensions (affective, instrumentale, développementale et intersubjective) autant que dans leurs réponses thérapeutiques, il nous semble que...

article

Wirbelsäulenchirurgische instrumentierte Versorgung

C. Klöckner

Der Orthopäde > 2010 > 39 > 4 > 432-436

In der wirbelsäulenchirurgischen instrumentierten Versorgung von Patienten mit einer manifesten Osteoporose sind einige Besonderheiten in die Planung und Durchführung der Operation einzubeziehen. Neben den Möglichkeiten einer verbesserten Implantatverankerung durch spezielle Schrauben und Augmentationsmöglichkeiten sollte bei diesen Patienten insbesondere die spinale Balance mitberücksichtigt werden.

article

A fully homemade 14N quadrupole resonance spectrometer

Nicolas Hiblot, Benoît Cordier, Maude Ferrari, Alain Retournard, more

Comptes rendus - Chimie > 2008 > 11 > 4-5 > 568-579

In spite of a renewed interest in Nuclear Quadrupole Resonance (NQR), especially of nitrogen-14 (for instance, for the detection and characterization of explosives), a full NQR instrument, ready to use in the laboratory, is not commercially available. We describe here an entirely homemade spectrometer, reasonably transportable, including the transmit-receive system, frequency generation, data acquisition,...

article

The Lyot Project: status and results

Anand Sivaramakrishnan, Ben R. Oppenheimer, Sasha Hinkley, Douglas Brenner, more

Comptes rendus - Physique > 2007 > 8 > 3-4 > 355-364

We present a retrospective on, and some new imaging data from The Lyot Project JHK coronagraph which is used behind the 3.6 m AEOS 941-channel AO telescope on Mt. Haleakala, on the island of Maui in Hawaii. This instrument is the first ‘extreme adaptive optics’ (ExAO) coronagraph ever; it opens up new scientific search spaces in direct imaging of faint companions of nearby stars. It also blazed a...

article

Inherent stiffness of three different posterior transpedicular fixation instrumentation. A mechanical comparative study

Panagiotis Korovessis, Despina Deligianni, Dimosthenis Mavrilas, Georgios Petsinis

European Journal of Orthopaedic Surgery & Traumatology > 2007 > 17 > 6 > 553-560

Instrumented lumbar fusion with posterior pedicle screw systems enhances fusion rate. Although rigid pedicle-screw instrumentation increases fusion rate, recently many adverse effects have been reported in lumbar spinal fusion augmented with rigid instrumentation. This study compares static, non-destructive mechanical “in vitro” properties of three different systems [segmental contouring system (SCS),...

article

On practical aspects of Laser Guide Stars

François Rigaut, Céline d'Orgeville

Comptes rendus - Physique > 2005 > 6 > 10 > 1089-1098

The Gemini Observatory has developed an extensive Adaptive Optics (AO) program, including Classical AO, Laser Guide Star (LGS) AO, Multi-Conjugate AO (MCAO), extreme AO (eXAO) and Ground Layer AO (GLAO). Most of these instruments use one or several LGSs. A laser has been in operation at Gemini since May 2005. Most of the laser related systems (beam transport, launch, safety systems) have been developed...

article

Detartrage et surfacage radiculaire

P. Laffargue, S. Soliveres, E. Challot, F. Jame, more

EMC - Dentisterie > 2004 > 1 > 1 > 55-61

Apres le controle de plaque, le traitement de la maladie parodontale est initie par le detartrage-surfacage qui permet l'elimination du biofilm et du tartre lors de la therapeutique etiologique. Il est ensuite utilise dans le cadre therapeutique de soutien parodontal. Ces actes realises a l'aide d'instrumentations manuelles et/ou ultrasoniques doivent permettre la plus grande preservation des tissus...

article

Scoliose idiopathique en periode de croissance. Indications et programmes therapeutiques

N. Khouri, R. Vialle, P. Mary, B. Biot

EMC - Rhumatologie-Orthopedie > 2004 > 1 > 1 > 45-63

Toute scoliose evolutive doit etre traitee efficacement. La kinesitherapie est utile, mais seule, elle est insuffisante. Le traitement orthopedique par corset permet de ralentir l'aggravation de la deformation. En cas d'echec ou de difficultes liees a la compliance du patient, l'evolutivite de la deformation peut rapidement rendre celle-ci inacceptable, des l'adolescence ou, a plus long terme, a l'age...

article

Measurement of Inherent Material Density of Nanoparticle Agglomerates

Kihong Park, David B. Kittelson, Michael R. Zachariah, Peter H. McMurry

Journal of Nanoparticle Research > 2004 > 6 > 2 > 267-272

We describe a new technique to measure the size dependent inherent material density of chain agglomerate particles. Measurements were carried out for diesel soot and aluminum/alumina agglomerate particles in the nanometer size range. Transmission electron microscopy was used to measure the volumes of agglomerate particles that were preselected by mass using an aerosol particle mass analyzer. We found...

article

AMBER: a near infrared focal instrument for the VLTI

Romain G. Petrov, Fabien Malbet, Andrea Richichi, Karl-Heinz Hofmann, more

Comptes Rendus de l'Academie des Sciences Series IV Physics > 2001 > 2 > 1 > 67-77

AMBER is the General User near-infrared focal instrument of the Very Large Telescope interferometer. Its specifications are based on three key programs on Young Stellar Objects, Active Galactic Nuclei central regions, masses and spectra of hot Extra Solar Planets. It has an imaging capacity because it combines up to three beams and very high accuracy measurement are expected from the spatial filtering...

article

Les aspects theoriques regissant l'instrumentation d'un capteur thermique parietal a faible inertie

Brahim Bourouga, Vincent Goizet, Jean-Pierre Bardon

International Journal of Thermal Sciences > 2000 > 39 > 1 > 96-109

Les aspects theoriques regissant l'instrumentation d'un capteur thermique parietal a faible inertie. Sur un modele simple de milieu semi-infini, on presente les developpements theoriques qui permettent d'optimiser l'instrumentation de capteurs thermiques parietaux. Ces capteurs de faibles dimensions, generalement equipes de deux thermocouples fins, doivent presenter une faible inertie dans le but...

article

Le collecteur de donnees, outil puissant et peu couteux pour surveiller l'environnement physique des recifs coralliens

Oceanologica Acta > 1999 > 22 > 6 > 687-698

The physical structure of coral reefs, like that of rainforests and other spatially-complex ecosystems, modulates light, fluid flow, and other physical variables to create a spatially and temporally complex mosaic of microhabitats. Accurate and affordable methods for quantifying this spatio-temporal variation are required to address many basic and applied research questions related to the ecology...

article

Miniature mass spectrometers and their potential for clinical point‐of‐care analysis

Yanbing Zhai, Xinyan Fu, Wei Xu

Mass Spectrometry Reviews > 43 > 5 > 1172 - 1191

Mass spectrometry (MS) has become a powerful technique for clinical applications with high sensitivity and specificity. Different from conventional MS diagnosis in laboratory, point‐of‐care (POC) analyses in clinics require mass spectrometers and analytical procedures to be friendly for novice users and applicable for on‐site clinical diagnosis. The recent decades have seen the progress in the development...

article

Automated spectrometer alignment via machine learning

Peter Feuer-Forson, Gregor Hartmann, Rolf Mitzner, Peter Baumgärtel, more

Journal of Synchrotron Radiation > 31 > 4 > 698 - 705

During beam time at a research facility, alignment and optimization of instrumentation, such as spectrometers, is a time‐intensive task and often needs to be performed multiple times throughout the operation of an experiment. Despite the motorization of individual components, automated alignment solutions are not always available. In this study, a novel approach that combines optimisers with neural...

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Search results

Optimisation de l’IRM de diffusion en imagerie cancérologique corps entier

The nature of the systematic radiometric error in the MGS TES spectra

Polityka jako przedmiot badań w realiach instrumentalizacji politologicznego rozumu

In vessel detection of delayed neutron emitters from clad failure in sodium cooled nuclear reactors: Information treatment

Ecological interface design and sensor noise

The multi-wavelength context in 2015 and beyond

TIC, TAC, TOC, TED et THADA : la fonction et le fonctionnement

Wirbelsäulenchirurgische instrumentierte Versorgung

A fully homemade 14N quadrupole resonance spectrometer

The Lyot Project: status and results

Inherent stiffness of three different posterior transpedicular fixation instrumentation. A mechanical comparative study

On practical aspects of Laser Guide Stars

Detartrage et surfacage radiculaire

Scoliose idiopathique en periode de croissance. Indications et programmes therapeutiques

Measurement of Inherent Material Density of Nanoparticle Agglomerates

AMBER: a near infrared focal instrument for the VLTI

Les aspects theoriques regissant l'instrumentation d'un capteur thermique parietal a faible inertie

Le collecteur de donnees, outil puissant et peu couteux pour surveiller l'environnement physique des recifs coralliens

Miniature mass spectrometers and their potential for clinical point‐of‐care analysis

Automated spectrometer alignment via machine learning

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