Search results for "miR"
showing 10 items of 1117 documents
Issues Related to the Restoration of Mirrors of the Wooden paliotto della chiesa del Santissimo Crocifisso all’Albergheria, Sicily (Italy)
2017
ABSTRACTIn this work, the decision-making process involved in the restoration of the eighteenth century paliotto ligneo (wooden altar frontal) della chiesa del Santissimo Crocifisso all’Albergheria of Palermo is presented. Earlier research concerning mirror restoration was based on only a few case studies and the proposed techniques were not suitable for the artwork here. As a consequence, it was necessary to re-examine theories and protocols of modern restoration to plan an appropriate intervention of the altar frontal. Since in this artwork the role of mirrors is not to give back images, as usual, but rather to create special light effects and play of lights, this work aims to find an app…
Modulation of cortical motor outputs by the symbolic meaning of visual stimuli
2010
The observation of an action modulates motor cortical outputs in specific ways, in part through mediation of the mirror neuron system. Sometimes we infer a meaning to an observed action based on integration of the actual percept with memories. Here, we conducted a series of experiments in healthy adults to investigate whether such inferred meanings can also modulate motor cortical outputs in specific ways. We show that brief observation of a neutral stimulus mimicking a hand does not significantly modulate motor cortical excitability (Study 1) although, after prolonged exposure, it can lead to a relatively nonspecific modulation (Study 2). However, when such a neutral stimulus is preceded b…
Does the brain know who is at the origin of what in an imitative interaction?
2012
International audience; Brain correlates of the sense of agency have recently received increased attention. However, the explorations remain largely restricted to the study of brains in isolation. The prototypical paradigm used so far consists of manipulating visual perception of own action while asking the subject to draw a distinction between self- versus externally caused action. However, the recent definition of agency as a multifactorial phenomenon combining bottom-up and top-down processes suggests the exploration of more complex situations. Notably there is a need of accounting for the dynamics of agency in a two-body context where we often experience the double faceted question of w…
Real-time acquisition of complex optical fields by binary amplitude modulation
2017
We describe, through simulations and experiments, a real-time wavefront acquisition technique using random binary amplitude masks and an iterative phase retrieval algorithm based on the Fresnel propagator. By using a digital micromirror device, it is possible to recover an unknown complex object by illuminating with this set of masks and simultaneously recording the resulting intensity patterns with a high-speed camera, making this technique suitable for dynamic applications.
Drifts in real-time partial wavefront correction and how to avoid them
2017
In visual experiments that require real-time partial correction of wavefront aberrations, small errors occur that accumulate over time and lead to drifts in Zernike coefficients of the uncorrected aberrations. A simple algorithm that does not require the inclusion of an additional optical path to obtain independent measurements of the eye's aberrations is described here, and its effectiveness in preventing these drifts is demonstrated.
Astronomical soft x-ray mirrors reflectivity enhancement by multilayer coatings with carbon overcoating
2004
A number of X-ray astronomical missions of near future will make use of hard X-ray optics with broad-band multilayer coatings. However multilayer mirrors can be also useful to enhance the effective area of a given X-ray telescope in the "classical" low energy X-ray band (0.1 – 10 keV), the window where X-ray spectroscopy provides very useful plasma diagnostics) with a consistent gain with respect to usual single-layer reflectors. Multilayers for soft X-rays are based on stacks with constant d-spacing (in order to minimize the loss due to the photoelectric effect). A further gain in reflectivity (however only restricted to the energy range between 0.5 and 4 keV) can be achieved by using a lo…
Zvaigžņotā Debess: 2008, Vasara
2008
Latvijas Zinātņu akadēmija, Latvijas Universitāte
Apaļā jūrasgrunduļa Neogobius melanostomus krājuma novērtējums Baltijas jūras Latvijas piekrastē
2021
Pētījumā veikts apaļā jūrasgrunduļa krājuma novērtējums Baltijas jūras Latvijas dienvidaustrumu piekrastē no 2014. - 2020. gadam, izmantojot rūpnieciskās zvejas un zinātnisko uzskaišu datus. Krājuma novērtēšanai tika izmantoti Starptautiskās Jūras pētniecības (ICES) padomes aprobētie analītiskie (XSA un SAM) modeļi, kā arī produkcijas (SPiCT) modelis. Apaļā jūrasgrunduļa krājuma novērtējums Latvijas piekrastes rajonā no Papes līdz Pāvilostai pēdējos septiņus gadus uzrāda, ka kopējā krājuma biomasa pa gadiem vidēji sastāda 905 - 11657 tonnas, nārsta krājuma biomasa ir 785 - 11283 tonnas, taču populācijas papildinājums (viengadīgās zivis) ir 7,8 - 41,9 miljoni zivis. Novērtētais zvejas mirstī…
Pētera Šmita sarakste ar Jāni Misiņu par latviešu valodas mācīšanu skolā, uzmanības pievēršanu tautas dziesmām, etnogrāfijai, lūgumu atsūtīt grāmatas
1916
P. Šmits vēstulē J. Misiņam izsaka pārdomas par stāvokli Rīgā, jo rit Pirmais pasaules karš, kā arī izsaka pārdomas par sava "Etnografisku rakstu krājuma" nākamā sējuma saturu, latviešu valodas mācīšanu skolā, uzmanības pievēršanu tautas dziesmām, etnogrāfijai. Vēstulē izskan lūgums atsūtīt vairākas grāmatas - kā J. Lautenbaha-Jūsmiņa, tā A. Niedras, Apsīšu Jēkaba, V. Rahmanova, H. Zālītes, E. Dinsberga, G. Merķeļa u.c. autoru, kā arī žurnālu "Druva" iznākušos numurus.
L'Obituaire du Saint-Mont (1406). Edition et commentaire.Edition électronique préparée en collaboration avec l'Ecole des Chartes et la Médiathèque du…
2005
International audience; En 1406, Guillaume de la Perche, prieur du Saint-Mont, fait ouvrir un livre pour inscrire le nom des bienfaiteurs de son monastère et célébrer leur mémoire. Cet obituaire ou livre des obits est aujourd'hui conservé à la médiathèque du Pontiffroy de Metz sous la cote 1156.Cet obituaire méritait de sortir de l'oubli. Premièrement, parce que c'est un beau "livre de la pratique", bien différent de nombreux obituaires qui ne sont que de misérables cahiers de quelques feuillets. L'objet reste bien modeste à côté de grandes commandes extérieures comme les Évangiles de Suthard de Senones par exemple1, mais il sort du lot commun des nombreux autres registres vosgiens. Ensuite…