Search results for "GRADIENTS"
showing 8 items of 48 documents
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…
Representing Echinococcus multilocularis gradients in space and time: fox data, models, and scale dependence
2004
International audience
Ar gradientu saistītās minimizācijas metodes
2020
Bakalaura darbs veltīts vairākargumentu funkciju optimizācijas metodēm, kuras sauc par gradienta metodēm. Darbā apskatītas četras metodes: gradienta metode, gradienta projekcijas metode, nosacītā gradienta metode un stohastiskā gradienta metode. Visām metodēm pievienoti piemēri, kas ilustrē metodes darbību. Metodiska rakstura darbs.
Active lighting applied to three dimensional reconstruction of specular metallic surfaces by polarization imaging
2005
This thesis deals with a new automated tridimensional inspection system for specular metallic surfaces, based on polarization analysis. We first present an extension of the ‘Shape from Polarization' method for dielectric to metallic surfaces. After being reflected, an unpolarized light wave becomes partially linearly polarized, depending on the surface normal and on the refractive index of the media it impinges on. Hence, by measuring the polarization parameters of the reflected light, the surface normals are computed. The ambiguity concerning the normals orientation is solved here with a new active lighting system. Then, we describe and compare numerical methods for reconstructing the trid…
Data from: The role of partial incubation and egg repositioning within the clutch in hatching asynchrony and subsequent effects on breeding success
2019
The main mechanism to achieve hatching asynchrony (HA) for incubating birds is to start heating the eggs before clutch completion. This might be achieved through partial incubation and/or early incubation. Even in the absence of incubation behaviour during the laying phase, clutches still experience a certain degree of asynchrony. Recent studies have shown that eggs located in the centre of the nest receive more heat than peripheral ones during incubation. Since eggs receiving more heat would develop faster, we hypothesised that HA should be shorter in nests where eggs were moved homogeneously along the centre-periphery space during incubation compared to those nests where eggs repeatedly r…
Gaismas un trokšņa piesārņojuma ietekme uz meža pūces Strix aluco sastopamību gar urbanizācijas gradientu: piemērs no Rīgas Latvijā
2017
Darba mērķis ir noskaidrot, kādi urbānās vides faktori ir svarīgi meža pūces dzīvotnes izvēlē pilsētvidē, vai gaismas un trokšņa piesārņojumam ir būtiska ietekme. Pētījumā izmantotas plaši pieejamas tālizpētes metodes, kas sniedz iespējas šo metodiku pielietot plašos reģionos un veikt datu interpretāciju. Veiktas uzskaites Rīgas administratīvās teritorijas robežās pūču telpiskās izplatības datu iegūšanais. Ar tālizpētes metodēm analizēti gaismas piesārņojuma un zemes virsmas seguma dati. Veikta vispārināto lineāro modeļu analīze meža pūces sastopamības prognozēšanai. Apsekotajās 173 vienībās kostatēti 40 meža pūces atsaukšanās gadījumi. Noskaidrots, ka meža pūces sastopamību urbānā vidē vis…
Biogeographic patterns of base-rich fen vegetation across Europe
2014
International audience; Questions: What is the distribution of base-rich fen vegetation and the specia- list species along European biogeographic regions? How do the gradients in spe- cies composition correlate to geography and climate at continental scale? What are the implications of such patterns for the classification of these habitats?Location: Fifteen countries of Central, Western and Northern Europe.Methods: We compiled a vegetation plot database of base-rich fens and related communities including vascular plants and bryophytes. The initial data set with 6943 plots was filtered according to the presence of specialists using discriminant analysis. We used DCA to analyse the correlatio…
High-gradient accelerating structure studies and their application in hadrontherapy
2013
198 páginas. Tesis doctoral del Departamento de Física Atómica, Molecular y Nuclear, de la Universidad de Valencia.