Search results for "Time"
showing 10 items of 12336 documents
Impact of viewing distance on relative depth judgements for stimuli in physical space
2019
In natural viewing, numerous depth cues are available to the visual system, but their significance varies considerably depending on the viewing distance. How is it reflected in the outcome of depth judgements? We have designed a psychophysical experiment with a limited number of depth cues to examine distance-related changes in the correct response rate and time. Twenty young adults evaluated relative depth of stimuli in physical space. Each time four constant angular size achromatic stimuli were presented on a volumetric multi-planar display. One of these stimuli was demonstrated closer to the observer comparing to others. The experiment followed the four-interval forced-choice procedure. …
Modeling solid waste decomposition.
2004
The hydrolysis rate coefficients of sorted municipal waste were evaluated from the biochemical methane potential tests using non-linear regression. A distributed mathematical model of anaerobic digestion of rich (food) and lean (non-food) solid wastes with greatly different rates of polymer hydrolysis/acidogenesis was developed to describe the balance between the rates of hydrolysis/acidogenesis and methanogenesis. The model was calibrated using previously published experimental data [Biores. Technol. 52 (1995) 245] obtained upon various initial food waste loadings. Simulations of one- and two-stage digestion systems were carried out. The results showed that initial spatial separation of fo…
Rapid, cost-effective, sensitive and quantitative detection of Acinetobacter baumannii from pneumonia patients
2011
Background and Objectives: Pneumonia with Acinetobacter baumannii has a major therapeutic problem in health care settings. Decision to initiate correct antibiotic therapy requires rapid identification and quantification of organism. The aim of this study was to develop a rapid and sensitive method for direct detection of A. baumannii from respiratory specimens. Materials and Methods: A Taqman real time PCR based on the sequence of blaoxa-51 was designed and used for direct detection of A. baumannii from 361 respiratory specimens of patients with pneumonia. All specimens were checked by conventional bacteriology in parallel. Results: The new real time PCR could detect less than 200 cfu per m…
Reflexionsakustische Lagebestimmung von Trachealkanülen
1997
Non-invasive acoustic airway monitoring was evaluated in an experimental study. Recording amplitude and travel time of acoustic pulse response, an area-distance function of the cross sectional dimensions of the endotracheal tube and the adjacent airway was calculated to obtain an acoustic pattern of the airway. Measurements on models and excised human cadaver lungs were performed to discover whether displacement or obstruction of the artificial airway can be detected in the acoustic equivalent. Regression analysis revealed a close correlation between displacement of tracheostomy tubes and the shifting of the acoustic area-distance function (corr. coeff. 0.97-1). Dispersion analysis confirme…
A SYMMETRIC AND POSITIVE DEFINITE BEM FOR 2-D FORCED VIBRATIONS
1997
A BEM formulation for 2D elastodynamics in the time domain has been presented. The formulation gives a resolving system that involves boundary displacements only. The stiffness and mass matrices of the boundary discretized body are frequency independent, symmetric and positive definite
Acoustic monitoring of the artificial airway — experimental results
1997
Non-invasive acoustic airway-monitoring was evaluated in an experimental study. Recording amplitude and travel time of acoustic pulse response, an acoustic pattern of airway's geometry was then calculated. Measurements on models and excised human cadaver lungs were performed to discover whether displacement or obstruction of the artificial airway could be detected by its acoustic equivalent. Regression analysis revealed a close correlation between displacement of tracheostomy tubes and the shifting of the acoustic area-distance function (corr. coeff.: 0.97-1) and an adequate correlation between acoustic and planimetrical determination of cross-sectional area within the tubes (corr. coeff.: …
Applicazione a 5 bacini siciliani di una procedura integrata per lo studio della propagazione delle onde di piena mediante modellazione bidimensional…
2004
La maggiore difficoltà per l’applicazione dei modelli numerici alla simulazione delle onde di piena in alvei naturali consiste nella acquisizione dei dati topografici e in una opportuna discretizzazione spaziale del dominio di calcolo. L’uso di modelli monodimensionali comporta la necessità di assegnare un orientamento prefissato alle sezioni di calcolo, di definire la geometria delle sezioni in base alla cartografia digitale, di tornare alla rappresentazione bidimensionale per la restituzione dei risultati. L’uso di mesh triangolari non strutturate e di metodologie numeriche incondizionatamente stabili consente di realizzare una modellazione bidimensionale che, oltre a produrre risultati m…
An Augmented Reality System for the Treatment of Acrophobia: The Sense of Presence Using Immersive Photography
2006
This paper describes an augmented reality (AR) system for the treatment of acrophobia. First, the technical characteristics of the original prototype are described. Second, the capacity of the immersive photography used in the AR system to provoke sense of presence in users is tested. Forty-one participants without fear of heights walked around a staircase in both a real environment and an immersive photography environment. Immediately after their experience, participants were given the SUS questionnaire to assess their subjective sense of presence. The users' scores in the immersive photography were very high. Results indicate that the acrophobic context can be useful for the treatment of…
Mesurer les critères et sentiments de justice des acteurs du système éducatif
2003
46e Session de la Conférence Internationale de l'éducation de l'Unesco, Genève, 5-8 septembre 2001 : "La problématique du vivre ensemble dans les curricula"; International audience
Root uptake, storage and remobilisation of autumn applied nitrogen to kiwifruit (Actinidia deliciosa) vines
2000
L'absorption racinaire, la subdivision, la conservation, et la redistribution de l'azote au niveau des racines ont ete etudiees sur des jeunes plantes de kiwi cv « Hayward », portant des fruits et cultives en pots. Deux rations de nitrate d'ammonium enrichi en 15 N [3,3 g (LN) et 10,0 g (HN) N par plante] ont ete distribuees 1 mois avant la recolte des fruits. Les fruits de kiwi ont absorbe 44-68 % du 1 5 N fourni a l'automne, qui a ete stocke principalement dans le systeme racinaire (61 %). Le 15 N a represente 22 et 36 % respectivement de l'azote total contenu dans les fruits des plantes LN et HN. Les feuilles ont retenu la plus grande partie de l'azote marque au cours de la senescence et…