Search results for "N20"
showing 10 items of 25 documents
Discrimination of common defects in loquat fruit cv. ‘Algerie’ using hyperspectral imaging and machine learning techniques
2021
Abstract Loquat (Eriobotrya japonica L.) is an important fruit for the economy of some regions of Spain that is very susceptible to mechanical damage and physiological disorders. These problems depreciate its value and prevent it from being exported. Visible (VIS) and near infrared (NIR) hyperspectral imaging was used to discriminate between external and internal common defects of loquat cv. ‘Algerie’. Two classifiers, random forest (RF) and extreme gradient boost (XGBoost), and different spectral pre-processing techniques were evaluated in terms of their capacity to distinguish between sound and defective features according to three approaches. In the first approach the fruit pixels were c…
CONSTRAINTS ON THE PROGENITOR SYSTEM AND THE ENVIRONS OF SN 2014J FROM DEEP RADIO OBSERVATIONS
2014
We report deep EVN and eMERLIN observations of the Type Ia SN 2014J in the nearby galaxy M 82. Our observations represent, together with JVLA observations of SNe 2011fe and 2014J, the most sensitive radio studies of Type Ia SNe ever. By combining data and a proper modeling of the radio emission, we constrain the mass-loss rate from the progenitor system of SN 2014J to $\dot{M} \lesssim 7.0\times 10^{-10}\, {\rm M_{\odot}\, yr^{-1}}$ (3-$\sigma$; for a wind speed of $100\, {\rm km s^{-1}}$). If the medium around the supernova is uniform, then $n_{\rm ISM} \lesssim 1.3 {\rm cm^3}$ (3-$\sigma$), which is the most stringent limit for the (uniform) density around a Type Ia SN. Our deep upper lim…
Spreading of Competing Information in a Network
2020
We propose a simple approach to investigate the spreading of news in a network. In more detail, we consider two different versions of a single type of information, one of which is close to the essence of the information (and we call it good news), and another of which is somehow modified from some biased agent of the system (fake news, in our language). Good and fake news move around some agents, getting the original information and returning their own version of it to other agents of the network. Our main interest is to deduce the dynamics for such spreading, and to analyze if and under which conditions good news wins against fake news. The methodology is based on the use of ladder fermion…
Curating as placing stones to be picked up: Interview with Anne-Cécile Sibué-Birkeland
2021
Two Great Banking Crises and Their Economic Impact Compared: Spain 1976/1977 and 2008
2017
The 1976/1977 crisis was the most severe in Spanish history, but the losses associated with the 2008 crisis are huge. This paper compares these two great banking crises and identifies the main parallels and differences between them. Is the current crisis as severe as that of 1976? What is the impact on the banking and financial sectors? We show that the 1976 crisis is being surpassed by the 2008 crisis in terms of the decline in GDP, industrial production and unemployment, and that these two events have had at least a similar impact in terms of output gap and output loss. Finally, the financial impact measured by different financial indicators confirms the greater severity of the 2008 crisi…
Financial crises in Spain: lessons from the last 150 years
2012
Financial crises are not unique to current financial systems. Are crises alike? Have they become more frequent, longer lasting and more severe since the 20th century? What does history tell us? The objective of this paper is to study the financial crises that have occurred in Spain over the last 150 years. We consider different types of crises (banking, currency and stock market crises), together with all their possible combinations, estimate their frequency by period and measure their length and depth. The main conclusion we obtain is that Spanish crises have been more frequent than in the rest of the world and have been more severe and more complex since 1973, as the 2007 crisis is confir…
Corporate crisis management in Italy: execution, monitoring and performance analysis of recovery business and financial plans
2018
This paper presents a thourugh investigation of how corporate crises are managed in the Italian context. It offers an investigation of the legal, accounting, finance and managerial aspects that are involved in the formal resolution of the crisis. The paper adopts a qualitative methodology consisting in a critical review of both the academic and the practical literature to present a systematic overview of how recovery plans are executed, monitored and their performance analyzed. The paper presents important insights for researchers, practitioners, enterpreneurs and managers interested in crisis management.
Do debt crises boost financial reforms?
2014
"Published online: 15 Aug. 2014"
Rational normal curves and Hadamard products
2021
AbstractGiven $$r>n$$ r > n general hyperplanes in $$\mathbb P^n,$$ P n , a star configuration of points is the set of all the n-wise intersection of the hyperplanes. We introduce contact star configurations, which are star configurations where all the hyperplanes are osculating to the same rational normal curve. In this paper, we find a relation between this construction and Hadamard products of linear varieties. Moreover, we study the union of contact star configurations on a same conic in $$\mathbb P^2$$ P 2 , we prove that the union of two contact star configurations has a special h-vector and, in some cases, this is a complete intersection.
Zvaigžņotā Debess: 2007/08, Ziema
2007
Latvijas Zinātnes padome, Latvijas Universitāte