Fast and accurate identification of biting midges is crucial in the study of Culicoides-borne diseases. In this work, we propose a two-stage method for automatically analyzing Culicoides (Diptera: ...Ceratopogonidae) species. First, an image preprocessing task composed of median and Wiener filters followed by equalization and morphological operations is used to improve the quality of the wing image in order to allow an adequate segmentation of particles of interest. Then, the segmentation of the zones of interest inside the biting midge wing is made using the watershed transform. The proposed method is able to produce optimal feature vectors that help to identify Culicoides species. A database containing wing images of C. obsoletus, C. pusillus, C. foxi, and C. insignis species was used to test its performance. Feature relevance analysis indicated that the mean of hydraulic radius and eccentricity were relevant for the decision boundary between C. obsoletus and C. pusillus species. In contrast, the number of particles and the mean of the hydraulic radius was relevant for deciding between C. foxi and C. insignis species. Meanwhile, for distinguishing among the four species, the number of particles and zones, and the mean of circularity were the most relevant features. The linear discriminant analysis classifier was the best model for the three experimental classification scenarios previously described, achieving averaged areas under the receiver operating characteristic curve of 0.98, 0.90, and 0.96, respectively.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
La Exposición-Muestrario de A Coruña se celebró en agosto de 1919, organizada por el consejo provincial de Agricultura y Ganadería e impulsada por el ingeniero jefe de minas Ramón del Cueto y Noval ...con el propósito de exhibir la producción que generaban las industrias y comercios de Galicia. Gracias a las escasas fuentes documentales que se conservan sobre este evento, especialmente a su catálogo fotográfico, se muestran algunos objetos que elaboraban las industrias coruñesas más importantes de las primeras décadas del siglo XX. Como resultado, se dan a conocer inéditamente esas empresas y algunos ejemplos puntuales de la producción artística y cultura material desaparecida que gestaron, como las escenografías de José de Souza Losada, la fundición Wonenburger, la vidriería de Narciso Pereira o los mármoles de Hijos de Baltasar Escudero, entre muchos otros.
Process optimization based on high-fidelity computer simulations or real experimentation is commonly expensive. Therefore, surrogate models are frequently used to reduce the computational or ...experimental cost. However, surrogate models need to achieve a maximum accuracy with a limited number of sampled points. Sequential sampling is a procedure in which sequentially surrogates are fitted and each surrogate defines the points that need to be sampled and used to fit the next model. For optimization purposes, points are sampled on regions of high potential for the optimal solutions. In this work, we first compared the effect of using different initial sets of points (experimental designs) in a sequential surrogate-based multiobjective optimization method. The optimization method is tested on five benchmark problems and the performance is quantified based on the total number of function evaluations and the quality of the final Pareto Front. Then an industrial applications on titanium welding is presented to show the use of the method. The case study is based on real experimental data.
Imports-ICT Linkage in Colombian Manufacturing Gomez-Sanchez, Andres Mauricio; Rosero-Ceballos, Elsy Lorena; Mosquera, Daniel Andres
International journal of the economics of business,
05/2023, Letnik:
30, Številka:
2
Journal Article
Recenzirano
The objective of this paper is to explore the ICT impact on firm's import decision and on firm's performance in import markets in Colombian manufacturing. This is the first document exploring this ...linkage in Latin America. We analyse firms' imports of raw materials (not exports as the tradition) because of the decisive role imports play in firms' exports. To deal with the problem of sample selection bias we replicate the Tobit II-Heckman procedure, by using a dynamic random effects probit model with panel data for decision process and a dynamic Generalized Linear Model (GLM) for performance process including Mills ratio. We include the influence of exports on imports, the initial conditions problem and the depreciation pattern of import experience. Our main results reveal a strong and direct impact of ICT on imports, especially for SMEs. Other results also suggest sunk costs/persistence, self-selection, cross-effects, and a decreasing import experience.
La Fábrica de Fundición y Loza La Victoria fue fundada por Joaquín Galiacho y Sierra en Monelos (A Coruña) y mantuvo su actividad productiva entre 1844 y 1858. A partir de la localización y análisis ...de diversos documentos gráficos y escritos, se da a conocer por primera vez su evolución empresarial, la especificación de su producción, su fisionomía arquitectónica y el impacto urbano que ocasionó en el desarrollo industrial de A Coruña.
gl A Fábrica de Fundición e Louza La Victoria foi fundada por Joaquín Galiacho y Sierra en Monelos (A Coruña) e mantivo a súa actividade produtiva entre 1844 e 1858. A partir da localización e análise de diversos documentos gráficos e escritos, dáse a coñecer por primeira vez a súa evolución empresarial, a especificación da súa producción, a súa fisonomía arquitectónica e o impacto urbano que ocasionou no desenvolvemento industrial da Coruña.
Interactions of cosmic ray secondaries with subsurface rocks produce both stable (3He, 21Ne, 22Ne) and radioactive (10Be, 26Al and 36Cl) cosmogenic nuclides. As the production rates by muons of 21Ne ...and 22Ne in quartz are not known, these can be estimated from published cross sections of analogous reactions, separately for fast and slow muon reactions. Our calculations show that subsurface 21Ne is affected mainly by fast muon interactions (P μf21Ne = 0.39 ± 0.15 at g−1a −1 vs Pμ−21Ne = 0.12 ± 0.03 at g−1a−1 sea level‐high latitude). We also infer that the resulting production rate ratio (P21Ne/P10Be) of 21Ne and 10Be changes with depth below the Earth's surface. This ratio in turn may provide supplemental erosion rate information in geological settings of varying erosion surface covers and for long time scales, when radionuclide data provide incomplete information. In environments with very low erosion rates, our calculations indicate noticeable differences in the production ratios P21Ne/P10Be, specifically for long time scales. However, calibrations are needed and may be carried out on a well documented quartz core.
•Air transportation.•Aircraft navigation.•Human factors.•Safety.•Workload reduction.
The continual growth in air traffic demand, the emergence of new flight routes, and the increased congestion at ...major airports are some of the important incentives for developing novel solutions to deal with increased pilot workload and improve safety. This paper introduces a novel Global Operational Concept (GOC) for commercial aviation cockpits that is intended to support pilots during peak workload situations. This GOC applies to two-flight crew operations, intentional and unintentional flight-crew reduction and total flight-crew incapacitation, and comprises different solutions that cover all safety-related crew duties across all phases of flight and serves as an interface between technology and organisations. The GOC concept was developed under the Advanced Cockpit for Reduction of Stress and Workload (ACROSS) project, which was part of the European Commission’s 7th Framework Programme (FP7) and investigated four solutions that will contribute to the reduction of pilot workload and stress by adapting cockpit applications and systems to challenging situations.
A small stalagmite from Cova da Arcoia in the Serra do Courel of northwestern Spain provides a record both of general climate change across the Holocene and of shorter-term shifts between wetter and ...drier conditions. Nineteen U-series dates from 9.3
ka to the present provide a chronology of the stalagmite with uncertainties of commonly only decades and at the most only 200
years. These dates constrain the age of 18 petrographic surfaces that are of two types, one (Type E) inferred to result from dissolution during enhanced flow of water and the other (Type L) inferred to result from lesser flow. Aragonite is more abundant in the earlier parts of the stalagmite and calcite is more abundant in the later part. Values of δ
13C range from −
5.6 to −
1.3‰ relative to VPDB but are greatest beneath Type L surfaces. Values of δ
18O range from −
5.4 to −
4.4‰ relative to VPDB and have a weak but statistically significant correlation with δ
13C.
Greater abundance of aragonite, greater values of δ
13C, and lesser frequency of Type E surfaces early in the stalagmite suggest a drier and perhaps warmer early to middle Holocene, whereas greater abundance of calcite and frequent Type E surfaces higher in the stalagmite suggest wetter conditions later in the Holocene. δ
18O data are most compatible with this general conclusion. However, a prominent Type E surface records the 8.2
ka event as an isolated wetter episode in the otherwise-dry early Holocene.
Much of the stalagmite's aragonite and calcite suggests normal stalagmite growth in moderate climatic conditions. However, the near or complete cessation of growth at Type L surfaces and greater δ
13C, greater δ
18O, and lesser fluorescence of aragonite beneath those surfaces combine to suggest at least six century-scale episodes of strikingly dry conditions. On the other hand, evidence of dissolutional erosion at Type E surfaces suggests at least ten distinct episodes of much wetter conditions. These combine to suggest highly variable climate across the Holocene at the scale of decades to a few centuries.
The record from this stalagmite is similar to records from Greenland ice cores and from pollen and/or stalagmite records from France, northernmost Spain, and more broadly from northern or Atlantic-facing Europe. In contrast, it suggests trends nearly opposite those in records from eastern and southern Spain, suggesting that the Serra do Courel is north of, but perhaps not far from, the boundary between Atlantic and Mediterranean regions of Holocene climate trends in the Iberian Peninsula. That general antiphasal relationship between northwestern Spain and regions to the south and east extends to the specific observation that four of the most pronounced wetter events in the stalagmite's record coincide with periods of widespread drought and/or cultural collapse in the Mediterranean and Middle East.
► Some stalagmite layers bounded by surfaces of dissolution; others by surfaces of less deposition. ► Petrography and isotope geochemistry of a stalagmite combined as a palaeoclimate record. ► Early Holocene in NW Spain warmer and drier, later Holocene cooler and wetter. ► Holocene climate punctuated by short-term very dry intervals and by markedly wetter intervals. ► Wet in NW Spain coeval with drought and collapse of ancient civilizations to east.
Introduction: Sodium glucose cotransporter 2 inhibitors (SGLT2i) are the latest antidiabetic treatments that reduces mortality and cardiovascular outcomes. Its use in real life in very elderly ...patients is limited by its possible side effects. Material and methods: We conducted a retrospective study of patients treated with SGLT2i in our community (La Rioja) since 2014. The safety (adverse effects) and prognosis (mortality, cardiac decompensation, and cardiovascular events) during the first 24 months of treatment were evaluated. Results: We included 235 patients treated with SGLT2i, 114 of them were men (48.5%), and the mean age was 79.6 ± 3.9 years. The most used SGLT2i was empagliflozin (55.7%). The mean Hb1Ac at the time of inclusion was 7.9 ± 1.4, showing a decrease in 47.7% of the included patients during the follow up. The initial values of creatinine and glomerular filtration rate at the time of inclusion (0.94 ± 0.3 and 68.3 ± 16.4) presented an improvement at 24 months of treatment (0.94 ± 0.27 and 68.2 ± 15.8). During follow-up, 94 adverse events were described in 84 patients, and 53 treatment suspensions. This adverse events were related with sex (p 0.004), dapagliflozin (p < 0.001) and initial Hb1Ac values (p 0.04). The most common adverse event were genitourinary infections (63), followed by acute kidney injury (9), being the latter the most frequent cause of treatment interruption. Symptomatic hypoglycaemia during the follow-up was related with treatment of insulin, age and Hb1Ac (p <0.01). Conclusions: Treatment with SGLT2i is a safe and well-tolerated treatment in very elderly patients in real life. Genitourinary infections are the most common adverse events, but those that less frequently cause treatment interruption.
Narrated through images and languages that evoke ever more extreme and often arresting realisms, the capturing of poverty through greater authenticity and intimate access, while arousing empathy or ...seeking social justice, has reached a creative abundance aided by cultural coalitions and incessant technological advances in the production, access, and mobility of text, photography, video, and film. This article addresses the aesthetic and political economies informing street children self-representation in two more or less recent Latin American examples in film and photography, where stark marginalization and truculent realities constitute the daily landscape but also the object of exposure, namely the Mexican documentary Voces de la Guerrero (dir. Adrián Arce, Diego Rivera Khon, Antonio Ziriòn, and the colonia Guerrero gang, 2004) and the bi-nationally produced book/project Cicatrices en mi piel: los niños de la calle se fotografían a sí mismos
(Scars on my Skin: Street Children Photograph Themselves, Hartwig Weber and Sierra Jaramillo, 2005). This trend can be considered, I suggest here, as a vivid manifestation of the commoditized cultural content Maurizio Lazzarato analyzed as immaterial labor but reflective, correspondingly, of a 'precarization' woven into global image and labor flows with a utopian, transformative imprint of ever more extreme realities of destitution. As testimonies of postindustrial urban displacement and cruelty, but also as reformative pedagogic missions, the examples I look at and interrogate in this article also resonate with other visual trends in that they are structured explicitly as collaborative endeavors between artists, ethnographers, sociologists or various other activists, and marginal subjects, with the express goal of the latter's self-representation and restoration. What distinguishes such collaborations is an overt drive toward auto-representation and an expressed hope that being in the image and in some control of its production will, through photographic dispersion, result in social renovation and/or empowerment.
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