Search results for "amer"

The Ups and Downs of Camera-Monitor Systems: The Effect of Camera Position on Rearward Distance Perception

2020

Objective This study investigates the effects of different positions of side-mounted rear-view cameras on distance estimation of drivers. Background Camera-monitor systems bring advantages as compared to conventional rear-view mirrors, such as improved aerodynamics and enlarged field-of-view. Applied research has mainly focused on the comparison between cameras and mirrors or on positioning of in-vehicle monitors. However, the positioning of the exterior camera awaits investigation given that the perspective of the observer at does affect depth perception at large. Method In two experiments, a total of 50 students estimated metric distances to static vehicles presented in realistic or 3D-re…

Intraoral Cameras as a Computer-Aided Diagnosis Tool for Root Canal Orifices

2011

The aim of this study was to evaluate the diagnostic advantage of a new software tool in combination with an intraoral camera for automatic detection of root canal orifices in life videos via the access cavity of extracted human molars. The performance of a predoctoral dental student analyzing the images of the camera (without automatic detection) was compared with that of an experienced observer. Sensitivity and confidence intervals were provided and compared with histological slices of 200 teeth used for evaluation. The software's sensitivity for detection of root canal orifices was 0.957 (95 percent confidence interval: 0.936 to 0.972). The sensitivity for the observer was 0.906 (95 perc…

Study of drilling and welding laser : dynamics of keyhole

2011

The aim of the present work is to study experimentally the formation of the capillary during the drilling and welding by laser beam and to develop the numerical simulation which allows following the dynamics and the evolution of the keyhole. The zinc was chosen as a test material because its thermodynamical properties are well known. To simplify the problem, in the first place the drilling mechanism was studied. Two experimental methods were used to characterize the evolution of the keyhole: the Direct Observation of Drilled Hole method, which allows the visualization of the keyhole after the application of laser pulses of different durations, and Zn-Quartz method, which allows the direct o…

Services supérieurs et recomposition urbaine

2000

Since the 1980s, we have observed an increasing tendency o f specialized services like producer services to leave their « natural habitat » in the center o f large met ropolitan areas in order to re loc at e in suburban zones. This phenomenon is particularly apparen t in North American citi es and seems to be occurring around certain French cities too. This paperinvestigates the forms taken by this new trend, and the reasons behind it. Taking economic geography and economics of cities as our theoretical basis, we first describe the main forces deter mining the agglomeration o f producer services and their preference for certain big cities. Agglomeration factors are to be looked for not only…

L'America dei Concordati, Sistemi pattizi e di coordinazione nel subcontinente

2020

Le molteplici convenzioni che sono state firmate tra la Santa Sede e gli Stati dello scacchiere latinoamericano hanno spesso rappresentato l’evoluzione verso concordati fondati non più sul confessionismo statale, ma sul riconoscimento della libertas Ecclesiae, ossia della sua autonomia e indipendenza nell’adempimento della propria missione specifica, e sulla libertà cultuale riconosciuta a tutti i cittadini e alle loro organizzazioni confessionali. Si rivela di particolare interesse analizzare la specificità di questi accordi in termini di dinamiche diplomatiche, nella tipicità dei sistemi delle relazioni bilaterali, nonché delle politiche religiose dal XIX al XXI secolo.

Sorprendente izquierda norteamericana

2004

Staphylococcal α-toxin: the role of the N-terminus in formation of the heptameric pore — a fluorescence study1This work contains parts of the M.D. th…

1997

Staphylococcus aureus alpha-toxin forms heptameric pores on eukaryotic cell membranes. Assembly of the heptamer precedes formation of the transmembrane pore. The latter event depends on a conformational change that drives a centrally located stretch of 15 amino acid residues into the lipid bilayer. A second region of the molecule that has been implicated in the pre-pore to pore transition is the far N-terminus. Here, we used fluorescently labeled single cysteine replacement mutants to analyze the functional role of the far N-terminus of alpha-toxin. Pyrene attached to mutants S3C, I5C and 17C forms excimers within the toxin pore complex. This indicates that the distance of adjacent N-termin…

La gangrena

2005

Ecological and agronomic importance of the plant genus Lotus. Its application in grassland sustainability and the amelioration of constrained and con…

2010

The genus Lotus comprises around 100 annual and perennial species with worldwide distribution. The relevance of Lotus japonicus as a model plant has been recently demonstrated in numerous studies. In addition, some of the Lotus species show a great potential for adaptation to a number of abiotic stresses. Therefore, they are relevant components of grassland ecosystems in environmentally constrained areas of several South American countries and Australia, where they are used for livestock production. Also, the fact that the roots of these species form rhizobial and mycorrhizal associations makes the annual L. japonicus a suitable model plant for legumes, particularly in studies directed to r…

How Populist Was David Cameron?

2016

The ‘rhetorical populism’ of the former prime minister's big society agenda may have waxed and waned, says Agnes Alexandre-Collier. But Cameron was an innovator of party management and governing practices whose focus on connecting with ‘the people’ transformed his party – but also supplied the means of his own downfall.