Search results for "iris"

Naturalismo ed empirismo nella filosofia di W.V. Quine

2004

Mapping a-priori defined plant associations using remotely sensed vegetation characteristics

2014

Abstract Incorporation of a priori defined plant associations into remote sensing products is a major challenge that has only recently been confronted by the remote sensing community. We present an approach to map the spatial distribution of such associations by using plant indicator values (IVs) for salinity, moisture and nutrients as an intermediate between spectral reflectance and association occurrences. For a 12 km 2 study site in the Netherlands, the relations between observed IVs at local vegetation plots and visible and near-infrared (VNIR) and short-wave infrared (SWIR) airborne reflectance data were modelled using Gaussian Process Regression (GPR) (R 2 0.73, 0.64 and 0.76 for sali…

Occurrence and regional distribution of striated muscle fibers in the rat pineal gland

1978

In a total of 96 rat pineals studied 31 were found to contain striated muscle fibers or their precursors. The muscle fibers were most frequently present in the stalk region and more frequently found in the left than in the right hemisphere. Size measurements revealed that the lengths of pineal muscle cell nuclei differ only slightly from those of the sphincter muscle of the iris. However, the yellowish appearance of pineal muscle cell nuclei under darkfield investigation, a phenomenon observed in all muscular tissues of mesenchymal origin and connective tissue cells, may support the hypothesis that pineal musculature is of mesenchymal rather than ectodermal origin.

Changes in Family Income around the Time of Birth of Children in Germany between 1985 and 2004

2010

Während der Verlauf und die Ursachen des Geburtenverhaltens intensiv erforscht wurden, sind die finanziellen Folgen einer Geburt empirisch kaum beachtet worden. Daher werden hier kurzfristige Wohlstandsveränderungen von Familien (hinsichtlich verfügbarem Haushaltseinkommen und Äquivalenzeinkommen) rund um die Geburt eines Kindes in längsschnittlicher Perspektive analysiert und auf ihre Ursachen untersucht. Zu diesem Zweck wurden die Daten des Sozio-oekonomischen Panels (1984-2005) mittels Fixed-Effekt-Panelregressionsmodellen analysiert. Als Ergebnis kann festgehalten werden, dass die finanziellen Folgen einer Geburt in den letzten Jahren deutlich gewachsen sind und vor allem das erste Kind…

Time as an Empirical Concept in Special Relativity

2019

According to a widespread view, Einstein’s definition of time in his special relativity is founded on the positivist verification principle. The present paper challenges this received outlook. It argues that Einstein’s position on the concept of time, to wit, simultaneity, is best understood as a mitigated version of concept empiricism. He contrasts his position to Newton’s absolutist and Kant’s transcendental arguments, and in part sides with Hume’s and Mach’s empiricist arguments. Nevertheless, Einstein worked out a concept empiricism that is considerably more moderate than what we find in the preceding empiricist tradition and early logical positivism. He did not think that the origin of…

Iris Clert (1918-1986). Une galeriste singulière

2017

thèse soutenue le 15 juin 2017 à l'Université de Bourgogne; International audience

Changes of the eye optics after iris constriction☆

2010

Purpose: To evaluate the possible change in the optics of the human eye after iris constriction. Methods: Ocular aberrations were measured under natural viewing conditions in 26 eyes. The measured eyes fixated on a dim target while the contralateral eye was either occluded (so the measured eye had a large pupil) or highly illuminated (so the measured eye had a small pupil). The measured eyes fixated to a dim target placed 0.5 D beyond the subject’s far point. Zernike values obtained in both situations were compared within the same pupil diameter corresponding to the one obtained under the high illumination condition. Results: Significant variation in some aberration coefficients were found …

Epistemic network analyses of economics students' graph understanding. An eye-tracking study

2020

Learning to solve graph tasks is one of the key prerequisites of acquiring domain-specific knowledge in most study domains. Analyses of graph understanding often use eye-tracking and focus on analyzing how much time students spend gazing at particular areas of a graph&mdash

Hume, David

2013

David Hume (1711—1776) oli skotlantilainen filosofi, historioitsija ja esseisti. Humea pidetään yleisesti merkittävimpänä englanninkielisenä filosofina. Hänen monipuolinen filosofinen työnsä kattaa lähes kaikki filosofian osa-alueet: tieto-opin, metafysiikan ja ontologian, mielenfilosofian ja tahdonvapauden ongelman, matematiikan filosofian, tieteen- ja luonnonfilosofian, yhteiskunta- ja moraalifilosofian, metaetiikan, estetiikan sekä uskonnonfilosofian. Nykyisestä Hume-tutkimuksesta suurin osa on historiallista, mutta monet hänen filosofiansa keskeiset teemat, kuten kausaliteetti, mielen kimpputeoria, induktion ongelma, sekä arvojen ja tosiseikkojen erottelu, ovat olennaisia myös nykyfilos…

Epistemologia empirista sense dogmes

1989

Josep Lluís Blasco critica en aquest article la concepció fonamentista del coneixement, d’arrel cartesiana i basada, sobretot, en el dogma empirista que afirma que els enunciats, als que classifica segons la dicotomia analític-sintètic, poden tenir confirmació o refutació aïlladament, en suposar un atomisme semàntic que defensa que tot enunciat amb significat és reductible a un enunciat sobre la experiència immediata. Per tal de realitzar la seua crítica, que té com a blanc principal l’empirisme tradicional, el Wittgenstein del Tractatus i el positivisme lògic, Blasco es basa en Quine, Tarsky i el segon Wittgenstein i defensa un holisme semàntic, ontològic i epistemològic. Segons el holisme…