Search results for "sun"
showing 10 items of 935 documents
Seasonal variability of radiation tide in Gulf of Riga
2020
Diurnal oscillations of water level in Gulf of Riga are considered. It was found that there is distinct daily pattern of diurnal oscillations in certain seasons. The role of sea breeze, gravitational tides and atmospheric pressure gradient are analysed. The interference of the first two effects provide the dominant role in diurnal oscillations. The effect of gravitational tides is described both with sole tidal forcing and also in real case with atmospheric forcing and stratification. The yearly variation of the declination of the Sun and stratification leads to seasonal intensification of gravitational tides in Gulf of Riga. Correlation between gravitational tide of the Sun with its radiat…
Controlling false match rates in record linkage using extreme value theory
2011
AbstractCleansing data from synonyms and homonyms is a relevant task in fields where high quality of data is crucial, for example in disease registries and medical research networks. Record linkage provides methods for minimizing synonym and homonym errors thereby improving data quality. We focus our attention to the case of homonym errors (in the following denoted as ‘false matches’), in which records belonging to different entities are wrongly classified as equal. Synonym errors (‘false non-matches’) occur when a single entity maps to multiple records in the linkage result. They are not considered in this study because in our application domain they are not as crucial as false matches. Fa…
Sun Induced Fluorescence Calibration and Validation for Field Phenotyping
2018
Reliable measurements of Sun Induced Fluorescence (SIF) require a good instrument characterization as well as a complex processing chain. In this paper, we summarize the state of the art SIF retrieval methods and measurements platforms for field phenotyping. Furthermore, we use HyScreen, hyperspectral-imaging system for top of canopy measurements of SIF, as an example of the instrument requirements, data process, and data validation needed to obtain reliable measurements of SIF.
Preliminary studies about thermal degradation of edible oils through attenuated total reflectance mid-infrared spectrometry
2009
Abstract Degradation of edible oils during their heating process has been evaluated through the determination of cis -unsaturation and trans -fatty acids together with free fatty acids as a function of time and temperature heating. Two types of cooking oils, sunflower and seed (mixture of different seeds non-detailed), were heated at three different temperatures (147, 171 and 189 °C) during a total time of 1920 min (32 h) shared out in four sessions of 8 h each one, and samples were studied from their spectra obtained by Fourier transform infrared spectrometry using attenuated total reflectance measurements. A critical comparison between different multivariate calibration models built based…
Pagar los platos rotos
2003
Un estudio exploratorio sobre los presupuestos participativos infantiles en el ámbito local español
2022
Esta nota metodológica adelanta datos valiosos sobre una investigación en curso, cuyo objetivo fundamental es comprobar la validez de una serie de variables que sirvan para el estudio del fenómeno de presupuestos participativos infantiles en España durante un periodo comprendido entre el 2015 y el 2021. Al igual que ocurre con esta experiencia participativa en el ámbito adulto, su definición es complicada dada la adaptación de la metodología al entorno en el que se implementa. Para su conformación, se han realizado encuestas de pregunta abierta (35 respuestas válidas) que han sido estudiadas a través de un análisis de datos cualitativos y el uso del programa MAXQDA. La realización de este e…
Bolentín ONUBIB: Septiembre 2017
2017
Recurso electrónico. Publicación trimestral de novedades bibliográficas de acceso libre y texto completo, de publicaciones de la ONU y de sus Organismos Especializados.
Boletín ONUBIB: Mayo 2018
2018
Recurso electrónico. Publicación trimestral de novedades bibliográficas de acceso libre y texto completo de publicaciones de la ONU y de sus Organismos Especializados. Electronic resource. Quarterly publication of bibliographic novelties of free access and complete text of publications of the UN and its Specialized Organizations.
Boletín ONUBIB : Marzo 2015
2015
Recurso electrónico. Publicación trimestral de novedades bibliográficas, de acceso libre y texto completo, de publicaciones de la ONU y de sus Organismos Especializados.
Boletín ONUBIB: Julio 2017
2017
Recurso electrónico. Publicación trimestral de novedades bibliográficas de acceso libre y texto completo, de publicaciones de la ONU y de sus Organismos Especializados.