Search results for "ALMA"

Rare Middle and Upper Devonian dalmanelloid (Orthida) of the Cantabrian Mountains, N Spain

2018

Rare Cantabrian Dalmanellidae ( Costisorthis lisae nov. sp.), Dicoelosiidae ( Teichertina cf. peregrina , T. cf. ?tzroyensis ), and Mystrophoridae ( Mystrophora sp., Biernatium suco i nov. sp., and Biernatium sp. 2) are described and ?gured for the ? rst time in Spain. Most of them are scarce forms that occur only in certain localities. All the species but one came from the lower part of the Portilla (province of Leon) and Candas (province of Asturias) formations, Faunal Interval 21, Polygnathus rhenanus/P. varcus conodont zone, middle Givetian. The exception is Biernatium sp. 2 that occurs in Asturias in FI 25, Pineres Fm., Palmatolepis transitans zone, lower Frasnian. Costisorthis ranges …

Sensorless Control of Induction-Motor Drive Based on Robust Kalman Filter and Adaptive Speed Estimation

2014

This paper deals with robust estimation of rotor flux and speed for sensorless control of motion control systems with an induction motor. Instead of using sixth-order extended Kalman filters (EKFs), rotor flux is estimated by means of a fourth-order descriptor-type robust KF, which explicitly takes into account motor parameter uncertainties, whereas the speed is estimated using a recursive least squares algorithm starting from the knowledge of the rotor flux itself. It is shown that the descriptor-type structure allows for a direct translation of parameter uncertainties into variations of the coefficients appearing in the model, and this improves the degree of robustness of the estimates. E…

Reflexiones sobre el pintor Lluís Dalmau a propósito de un retablo para Molins de Rei (1451)

2018

El presente texto plantea una serie de reflexiones sobre la figura del pintor Lluís Dalmau, uno de los introductores de la pintura gótica flamenca en la Corona de Aragón. El análisis surge a partir de la presentación de un nuevo documento inédito sobre un retablo contratado en 1451 por Isabel de Requesens, esposa del gobernador de Cataluña, Galceran de Requesens, para la baronía de Molins de Rei (Barcelona). El documento sitúa al pintor realizando este encargo en Valencia, lo que supone un regreso hasta ahora desconocido a su ciudad natal tras haber realizado la tabla de la Mare de Déu dels Consellers, de Barcelona (1443-1445), y el retablo de san Baudilio, de Sant Boi de Llobregat (1448). …

Retinal ultrastructure of neuronal ceroid-lipofuscinosis in the Dalmatian dog

1985

Ultrastructural studies of the retinae in two NCL-affected Dalmatian dogs revealed ubiquitous accumulation of lipopigments in numerous cell types of the retina, the fine structure of which closely resembled that seen in NCL-affected English setters. Photoreceptors and other retinal cell types were largely intact. These findings show that the retinal involvement in NCL of our Dalmatian dogs is identical to that of NCL-affected English setters. It also shows that in canine NCL a severe retinopathy, regularly encountered in human childhood NCL, does not develop. Thus, the NCL of Dalmatian dogs —and English setters — represents a reliable model to study human NCL, but for human retinopathia pig…

Climatic oscillations triggered post-Messinian speciation of Western Palearctic brown frogs (Amphibia, Anura, Ranidae)

2003

Abstract Oscillating glacial cycles over the past 2.4 million years are proposed to have had a major impact on the diversity of contemporary species communities. We used mitochondrial and nuclear DNA sequence data to infer phylogenetic relationships within Western Palearctic brown frogs and to test the influence of Pliocene and Pleistocene climatic changes on their evolution. We sequenced 1976 bp of the mitochondrial genes 16S rRNA and cytochrome b and of the nuclear rhodopsin gene for all current species and subspecies. Based on an established allozyme clock for Western Palearctic water frogs and substitution rate constancy among water frogs and brown frogs, we calibrated a molecular clock…

Ruotsi, Suomi ja akateemisen kirkkohistoriantutkimuksen alkutaival

2022

Qualità delle produzioni orticole irrigate con acque salmastre al variare della gestione colturale in ambiente semiarido.

2008

Nella piana alluvionale di Licata (Sicilia meridionale), sotto un clima semiarido, vengono irrigati suoli con acque saline del fiume Salso e di falda (C5-S1) per la produzione di colture orticole. I dati analitici evidenziano processi di salinizzazione e sodicizzazione del suolo. La concentrazione salina dei suoli influenza la risposta quantitativa e qualitativa delle colture. Gli Autori, attraverso la composizione ionica di estratti acquosi di ceneri di zucchino e finocchio (Cucurbita pepo e Foeniculum vulgare) descrivono la qualità delle produzioni ottenute.

Austrumu un rietumu mīti Salmana Rušdi romānā "Florences burve"

2020

Austrumu un rietumu mītiem daudzu gadsimtu garumā bijusi būtiska loma dažādos literārajos darbos. Šī pētnieciskā darba mērķis ir pierādīt, ka austrumu un rietumu mītiem ir nozīmīga loma Salmana Rušdi romānā „Florences burve”. Mērķa sasniegšanai tika studēti dažādi austrumu un rietumu mīti, ieskaitot mītus no Tuvo Austrumu folkloras stāstu krājuma „Tūkstoš un vienas nakts pasakas”, mītu par Pigmalionu un Galateju, renesanses laika dzejoļus „Orlando innamorato” un „Orlando furioso”. Rezultāti pierāda, ka austrumu un rietumu mīti Rušdi romānā ir komplicēti un pārklāj cits citu, tie skar politiskas un sociālas problēmas. Pētījumā tika pierādīts, ka eksistē būtiskas paralēles starp mītiem Salman…

Solving Non-Stationary Bandit Problems by Random Sampling from Sibling Kalman Filters

2010

Published version of an article from Lecture Notes in Computer Science. Also available at SpringerLink: http://dx.doi.org/10.1007/978-3-642-13033-5_21 The multi-armed bandit problem is a classical optimization problem where an agent sequentially pulls one of multiple arms attached to a gambling machine, with each pull resulting in a random reward. The reward distributions are unknown, and thus, one must balance between exploiting existing knowledge about the arms, and obtaining new information. Dynamically changing (non-stationary) bandit problems are particularly challenging because each change of the reward distributions may progressively degrade the performance of any fixed strategy. Alt…

Relative Vessel Motion Tracking using Sensor Fusion, Aruco Markers, and MRU Sensors

2017

This paper presents a novel approach for estimating the relative motion between two moving offshore vessels. The method is based on a sensor fusion algorithm including a vision system and two motion reference units (MRUs). The vision system makes use of the open-source computer vision library OpenCV and a cube with Aruco markers placed onto each of the cube sides. The Extended Quaternion Kalman Filter (EQKF) is used for bad pose rejection for the vision system. The presented sensor fusion algorithm is based on the Indirect Feedforward Kalman Filter for error estimation. The system is self-calibrating in the sense that the Aruco cube can be placed in an arbitrary location on the secondary ve…