170,258 research outputs found
La motivation scolaire : approches récentes et perspectives pratiques
No full textSommaire du dossier : 'La motivation en situation d'apprentissage : les apports de la psychologie de l'éducation' (B. Galand); 'L'illusion d'incompétence et les facteurs associés chez l'élève du primaire' (T. Bouffard, C. Vezeau, R. Chouinard, G. Marcotte); 'Est-il possible de prédire l'évolution de la motivation pour le travail scolaire de l'enfance à l'adolescence ?' (J.L. Gurtner, A. Gulfi, I. Monnard, J. Schumacher); 'Buts de performance et de maîtrise et interaction sociales entre étudiants : la situation particulière du désaccord avec autrui' (C. Darnon, C. Buchs, F. Butera); 'Les buts sociaux de l'élève : leurs causes et leurs conséquences à l'école' (L. Filisetti, K. Wentzel, E. Dépret); 'Structures de buts, relations enseignants-élèves et adaptation scolaire des élèves : une analyse multi-niveaux' (B. Galand, P. Philippot, M. Frenay)
Quintiliano e i gesuiti
No full textLo studio analizza la vasta e profonda eredità dell'Institutio oratoria di Quintiliano nell'ambito della retorica e della pedagogia gesuitica
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
High resolution measurements and modeling of auroral hydrogen emission line profiles
No full textMeasurements in the visible wavelength range at
high spectral resolution (1.3 A° ) have been made at Longyearbyen,
Svalbard (15.8 E,78.2 N) during an interval of intense
proton precipitation. The shape and Doppler shift of hydrogen
Balmer beta line profiles have been compared with
model line profiles, using as input ion energy spectra from
almost coincident passes of the FAST and DMSP spacecraft.
The comparison shows that the simulation contains the important
physical processes that produce the profiles, and confirms
that measured changes in the shape and peak wavelength
of the hydrogen profiles are the result of changing
energy input. This combination of high resolution measurements
with modeling provides a method of estimating the
incoming energy and changes in flux of precipitating protons
over Svalbard, for given energy and pitch-angle distributions.
Whereas for electron precipitation, information on the incident
particles is derived from brightness and brightness ratios
which require at least two spectral windows, for proton precipitation
the Doppler profile of resulting hydrogen emission
is directly related to the energy and energy flux of the incident
energetic protons and can be used to gather information
about the source region. As well as the expected Doppler
shift to shorter wavelengths, the measured profiles have a significant
red-shifted component, the result of upward flowing
emitting hydrogen atoms
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
Quintiliano e il «visibile parlare»: strumenti visuali per l’oratoria latina
No full textSeconda parte di uno studio complessivo (iniziato con G. Moretti, "Mezzi visuali per le passioni retoriche: le scenografie dell'oratoria" in Le passioni della retorica, a cura di G. Petrone, Palermo: Flaccovio, 2004, p. 63-96), l’articolo affronta il tema più generale dei mezzi visuali impiegati come supporto dell’oratoria latina (visual tools, come oggetti ed immagini, spesso preeesistenti alla performance oratoria) dal punto di vista invece delle iconografie appositamente prodotte per fini oratori e processuali. In questo senso il nucleo germinale e fondativo della tradizione romana di iconografie a supporto della performance oratoria è costituito dalla laudatio funebris, che aveva come peculiarissimo referente visuale sia il cadavere stesso del defunto, ritto accanto ai rostra, sia le imagines degli antenati, indossate da individui a loro somiglianti che, dopo aver spettacolarmente sfilato nella pompa funebris, siedono in fila accanto ai rostra su seggi d’avorio. Da questo nucleo fondativo e legittimante nascerà tutta una tradizione romana di ostensione di cadaveri e di reimpiego di imagines funebres in contesti oratori. Un altro tipo di immagini utilizzate durante un atto oratorio è costituito da immagini geografiche di vario tipo: un impiego molto antico di supporti visuali a scopo persuasivo, se già Erodoto ci informa dell’impiego di uno strumento del genere (una delle prime mappe del mondo greco) usato da Aristagora di Mileto per convincere gli Spartani a intervenire militarmente in aiuto della sua città. A Roma L. Ostilio Mancino, il primo Romano ad entrare a Cartagine dopo la sua resa, fece fare dei quadri che rappresentavano la città e gli attacchi successivi che vi vennero portati, e dopo averli esposti al pubblico li utilizzò come supporto oratorio durante la sua campagna elettorale per il consolato. Immagini ancora più esclusivamente connesse con la performance oratoria in un processo sono quelle tabulae o quei siparia, di cui ci parla Quintiliano, rappresentanti la scena di un delitto e fatti confezionare per lo più dall’avvocato dell’accusa per suscitare la commozione del giudice e dell’uditorio; talora invece, come nel caso del processo a Manio Curio, di cui ci parla ancora Quintiliano, il quadro mostrato ai giudici raffigurava in una serie di vignette o di scene, secondo una tecnica ben nota alla pittura narrativa romana, la vicenda biografica di un imputato. L’impiego oratorio di strumenti visuali appositamente confezionati per quell’occasione e quello scopo non esaurisce in realtà tutta la gamma di possibilità mostrate dalle fonti antiche in relazione al rapporto fra oralità ed immagine. Vi sono casi interessanti infatti che – sebbene non riguardino l’oratoria propriamente detta – ci mostrano la parola e l’immagine che si accompagnano reciprocamente nel loro farsi: in cui cioè chi parla è anche colui che traccia per il suo pubblico, con i mezzi che ha a disposizione, immagini efficacemente esplicative. È soprattutto il genere elegiaco ad offrirci ricorrenti esempi di tal genere: disegnare parlando è qualcosa che fanno i soldati, schizzando con mezzi rudimentali un supporto grafico alla narrazione delle loro imprese di guerra; così farà anche Ulisse nel secondo libro dell’Ars ovidiana, disegnando per Calipso con un bastoncino sulla sabbia del litorale una mappa dell’assedio di Troia presto cancellata dalle onde. I mezzi visuali per la performance oratoria saranno destinati a trovare poi nuove e straordinarie occasioni di impiego nella cultura cristiana, dove la loro evidentia spettacolare si metterà al servizio della liturgia e della predicazione: come accade nel caso straordinario quanto singolare (ben studiato da Guglielmo Cavallo) dei rotoli liturgici dell’Exultet di area longobardo-cassinese, che consentivano al popolo che assisteva alla liturgia una visione di immagini contemporanea al procedere della corrispondente parola liturgica
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
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