Search results for "N01"
showing 10 items of 11 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…
Joan Robinson: «In memoriam»
1983
“A veces me he preguntado si me he quedado sola.” (J. R.) Ahora ya no hay duda de que la obsesión intelectual que persiguiera a J. Robinson a lo largo de su dilatada carrera no tiene más justificatión que la de ver agotarse —a destiempo, como siempre— las baterías de su propia soledad. A principios del mes de agosto moría esta brillante economista a quien todos los profesionales del gremio debemos, directa o indirectamente, alguna cosa (1).
El sistema de transportes en España y Francia, 1750–1850. A proposito de dos libros recientes
1986
Tradicionalmente, la literatura sobre historia económica del transporte ha partido de la irrupción del ferrocarril como medio revolucionario en la economía decimonónica. Así, la atención preferente de los investigadores ha recaído sobre los procesos de construcción de la red ferroviaria en los diversos países y en el impacto para la economía del nuevo sistema de comunicaciones. Sin embargo, son menos numerosos los trabajos sobre los distintos modos de transporte en períodos anteriores al advenimiento de la época ferroviaria, y muchos menos los que han tenido en cuenta en sus análisis las vías de comunicación, su estado y organización en el espacio, en relación con las posibilidades de desar…
Detection of Invisible Damages in ‘Rojo Brillante’ Persimmon Fruit at Different Stages Using Hyperspectral Imaging and Chemometrics
2021
[EN] The main cause of flesh browning in 'Rojo Brillante' persimmon fruit is mechanical damage caused during harvesting and packing. Innovation and research on nondestructive techniques to detect this phenomenon in the packing lines are necessary because this type of alteration is often only seen when the final consumer peels the fruit. In this work, we have studied the application of hyperspectral imaging in the range of 450-1040 nm to detect mechanical damage without any external symptoms. The fruit was damaged in a controlled manner. Later, images were acquired before and at 0, 1, 2 and 3 days after damage induction. First, the spectral data captured from the images were analysed through…
Sharing Mare Nostrum: An Analysis of Mediterranean Maritime History Articles in English-Language Journals.
2015
This discussion paper is a follow-up to a previous bibliometric analysis of articles published in The International Journal of Maritime History and maritime-themed articles published in other economic and business history journals over the last 25 years. The paper looks more closely at articles dealing with the Mediterranean and articles written by scholars from the Mediterranean countries. The article is structured around five propositions about current trends in Mediterranean maritime history publishing in English-language journals.
Application of deep convolutional neural networks for the detection of anthracnose in olives using VIS/NIR hyperspectral images
2021
Anthracnose is one of the primary diseases that affect olive production before and after harvest, causing severe damage and economic losses. The objective of this work is to detect this disease in the early stages, using hyperspectral images and advanced modelling techniques of Deep Learning (DL) and convolutional neural networks (CNN). The olives were artificially inoculated with the fungus. Hyperspectral images (450–1050 nm) of each olive were acquired until visual symptoms of the disease were observed, in some cases up to 9 days. The olives were classified into two classes: control, inoculated with water, and fungi composed of olives inoculated with the fungus. The ResNet101 architecture…
Application of near Infrared Spectroscopy to the Quality Control of Citrus Fruits and Mango
2016
NIR spectroscopy is a proved tool to measure the optical properties of the samples, which are related to their chemical and textural properties. This technology can be used for determining the internal and external quality of fruits. Accordingly, many studies have been reported for long time to assess the quality of different fresh fruits by using reflectance measurements acquired with visible-NIR spectroscopy. We have been working on the estimation of the quality of fruits using computer vision for more than twenty years, always focused on problems that affect the local industry. As the region of Valencia (Spain) is one of the main producers and exporters of citrus fruits worldwide, most o…
Application of deep convolutional neural networks for the detection of anthracnose in olives using VIS/NIR hyperspectral images
2021
Abstract Anthracnose is one of the primary diseases that affect olive production before and after harvest, causing severe damage and economic losses. The objective of this work is to detect this disease in the early stages, using hyperspectral images and advanced modelling techniques of Deep Learning (DL) and convolutional neural networks (CNN). The olives were artificially inoculated with the fungus. Hyperspectral images (450–1050 nm) of each olive were acquired until visual symptoms of the disease were observed, in some cases up to 9 days. The olives were classified into two classes: control, inoculated with water, and fungi composed of olives inoculated with the fungus. The ResNet101 arc…
Una nueva mirada al informe de Ley Agraria de Jovellanos doscientos años después
1995
Editada en la Fundación Empresa Pública Con motivo del bicentenario (1795-1995) de la publicación de lnforme de Ley Agraria de Jovellanos se presenta una visión retrospectiva de esa obra ya clásica del pensamiento español incluyendo un repaso de sus múltiples y desacordes intérpretes modernos y un análisis del interior del texto e incluso del título. Se concluye insistiendo en la plena inserción del Informe en la tradición ilustrada española, en que los usuales calificativos de mercantilista, liberal smithniano o fisiócrata son inadecuados y en que es preciso restituir la obra y su autor a su tiempo. Publicado
Modelos de crecimiento economico endogeno e historia economica: ¿Una nueva perspectiva ante el debate protección-librecambio?
1992
La evidencia cuantitativa aportada en los últimos años en diferentes investigaciones ha permitido una interpretación sobre la trayectoria económica española para el período 1874–1936, en la cual se combina la constatación de tasas apreciables de crecimiento con el mantenimiento de un grado elevado de atraso. Y como señaló Lluch (1988), si el ámbito temporal se amplía hasta la actualidad, cualquier interpretación debería incluir la tardía recuperación de este último como un hecho clave a considerar.No resulta, por tanto, sorprendente que las razones de la persistencia durante un largo período histórico de esta distancia entre los logros de la economía española y los conseguidos por los denom…