Search results for "DIRECTION"
showing 10 items of 343 documents
BOTH MALE AND FEMALE SEXUAL ORNAMENTS REFLECT OFFSPRING PERFORMANCE IN A FISH
2010
Secondary sexual characters are often expressed in both sexes (mutual ornamentation), but are less often studied simultaneously. We studied the adaptive signaling function of male and female ornamentation in a mutually ornamented fish, the whitefish Coregonus lavaretus. In an experimental design in which nongenetic environmental effects were minimized, we found that highly ornamented females, males, and their parental combinations had offspring with better swimming performance and predator-avoidance ability than less ornamented individuals or combinations. Furthermore, highly ornamented females had larger offspring that also had higher yolk volume than less ornamented individuals. Offspring…
Autorità amministrative indipendenti e istituzioni politiche: questioni problematiche
2019
Le Autorità indipendenti rappresentano un modello di regolazione estraneo alla tradizione giuridica italiana, e, per questo, la loro collocazione ordinamentale ha suscitato, e continua a suscitare, dubbi e incertezze, riproponendo questioni fondamentali che appaiono tutt’altro che sopite. Inoltre, le dinamiche connesse al funzionamento delle Autorità indipendenti hanno evidenziato una notevole capacità evolutiva, per cui il loro ruolo ha conosciuto importanti mutamenti, assumendo caratteristiche diverse rispetto al funzionamento della forma di governo, e comportando nuovi assetti nelle relazioni con gli organi della legislazione, oltre che con gli organi della giurisdizione. Autonomia funzi…
Contrast sensitivity perimetry tests along the cardinal directions in color space: Correlation with the properties of the neural mechanisms mediating…
2014
It is well-known the advantages of measuring chromatic and achromatic contrast sensitivity for detecting pathologies. But these measurements are rarely used in clinical practice, due the complexity of the measurements and the examinator specialization. In fact, there is not a complete characterization of the response of the visual pathways to achromatic and chromatic spatio-temporal frequency stimuli. We have designed a new experimental device that facilitates these measurements and allow us to characterize the visual response in healthy patients. In this paper, we evaluated the responses of the visual pathways in healthy patients.
Inverting the Wollaston Illusion: Gaze Direction Attracts Perceived Head Orientation
2021
In the early 19th century, William H. Wollaston impressed the Royal Society of London with engravings of portraits. He manipulated facial features, such as the nose, and thereby dramatically changed the perceived gaze direction, although the eye region with iris and eye socket had remained unaltered. This Wollaston illusion can be thought of as head orientation attracting perceived gaze direction when the eye region is unchanged. In naturalistic viewing, the eye region changes with head orientation and typically produces a repulsion effect. Here we explore if there is a flip side to the illusion. Does the gaze direction also alter the perceived direction of the head? We used copies of the o…
Spatio-temporal Contrast Sensitivity in the Cardinal Directions of the Colour Space. A Review
2010
AbstractWe review the psychophysics of the spatio-temporal contrast sensitivity in the cardinal directions of the colour space and their correlation with those neural characteristics of the visual system that limit the ability to perform contrast detection or pattern-resolution tasks. We focus our attention particularly on the influence of luminance level, spatial extent and spatial location of the stimuli - factors that determine the characteristics of the physiological mechanisms underlying detection. Optical factors do obviously play a role, but we will refer to them only briefly. Contrast sensitivity measurements are often used in clinical practice as a method to detect, at their early …
Geometric and morphologic evolution of normal fault planes and traces from 2D to 4D data
2003
Abstract The detailed 3D geometry of normal fault planes is described and analysed using datasets from outcrop studies (2D), seismic surveys (3D) and analogue models (4D). Different geometric configurations of simple isolated normal faults are studied by reference to processes of normal fault propagation. When a normal fault propagates without interacting with other fault zones, the entire border of the principal plane displays characteristic connected secondary structures. These secondary structures cause bifurcations of the principal fault terminations. The along-strike terminations of the principal plane display typical bifurcation configurations (‘ear geometry‘). The orientation of the …
Directionlets: Anisotropic Multidirectional representation with separable filtering
2006
In spite of the success of the standard wavelet transform (WT) in image processing in recent years, the efficiency of its representation is limited by the spatial isotropy of its basis functions built in the horizontal and vertical directions. One-dimensional (1-D) discontinuities in images (edges and contours) that are very important elements in visual perception, intersect too many wavelet basis functions and lead to a nonsparse representation. To efficiently capture these anisotropic geometrical structures characterized by many more than the horizontal and vertical directions, a more complex multidirectional (M-DIR) and anisotropic transform is required. We present a new lattice-based pe…
L'utopie au jour le jour. Une histoire des expériences coopératives, XIXe-XXIe siècle
2020
International audience; En cette période de crise économique et de remise en cause du capitalisme, la coopération revient à la mode. Mais on ignore encore beaucoup de l’histoire de ce mode d’organisation qui prétend mettre la démocratie au cœur de l’économie. Si les cadres institutionnels, et les débats théoriques que les coopératives ont suscités depuis le début du XIXe siècle sont bien connus, leur histoire pratique reste largement ignorée. Que se passe-t-il une fois franchie la porte de la cave coopérative, du magasin ou de l’atelier ? Comment s’organise, au jour le jour, le travail des coopérateurs ? Quand peut-on dire qu’une coopérative est une réussite ? Et comment ses membres partici…
Teolingvistika dwadcatʹ let spustâ
2020
At the turn of the 20th and 21st centuries intensive research was conducted at the intersection of two sciences: theology and linguistics, which gave scientists the opportunity to raise the question of the possibility of allocating theolinguistics in the linguistics section. At the beginning, there were discussions and debates about the very term “theolinguistics”, its definitions, directions, methods of research in theolinguistics, and the status of theolinguistics as a scientific discipline. The present article attempts to briefly present the twenty-year history of theolinguistics of the 21st century.The paper also describes the main directions of research and draws attention to the role …
Angular Dependency of Hyperspectral Measurements over Wheat Characterized by a Novel UAV Based Goniometer
2015
In this study we present a hyperspectral flying goniometer system, based on a rotary-wing unmanned aerial vehicle (UAV) equipped with a spectrometer mounted on an active gimbal. We show that this approach may be used to collect multiangular hyperspectral data over vegetated environments. The pointing and positioning accuracy are assessed using structure from motion and vary from σ = 1° to 8° in pointing and σ = 0.7 to 0.8 m in positioning. We use a wheat dataset to investigate the influence of angular effects on the NDVI, TCARI and REIP vegetation indices. Angular effects caused significant variations on the indices: NDVI = 0.83–0.95; TCARI = 0.04–0.116; REIP = 729–735 nm. Our analysis high…