Search results for " mac"
showing 10 items of 3066 documents
Quantitative Rotor Broken Bar Evaluation in Double Squirrel Cage Induction Machines under Dynamic Operating Conditions
2013
Advanced monitoring techniques leading to fault diagnosis and prediction of induction machine faults, operating under non-stationary conditions have gained strength because of its considerable influence on the operational continuation of many industrial processes. In case of rotor broken bars, fault detection based on sideband components issued from currents, flux, instantaneous control or power signals under different load conditions, may fail due to the presence of inter-bar currents that reduce the degree of rotor asymmetry, especially for double squirrel cage induction motors. But the produced core vibrations in the axial direction, can be investigated to overcome the limitation of the …
Characterization of the Magnetic Induction Field produced by Secondary Substations
2014
The aim of this paper is to develop a methodology for measuring the magnetic field distribution around the prefabricated secondary substations in vibrated reinforced concrete, as well as the definition of a methodology to determining the maximum value of magnetic induction produced by the substations in correspondence to nominal current of the transformer. As proposed has been developed in conformity with laws and standards and can be applied to active and passive secondary substations. The experimental validation of the proposed methodology, carried out by a measurements campaign whose results are reported, confirms the validity and returns a versatile and simple tool for the verification …
CoproID predicts the source of coprolites and paleofeces using microbiome composition and host DNA content
2020
Shotgun metagenomics applied to archaeological feces (paleofeces) can bring new insights into the composition and functions of human and animal gut microbiota from the past. However, paleofeces often undergo physical distortions in archaeological sediments, making their source species difficult to identify on the basis of fecal morphology or microscopic features alone. Here we present a reproducible and scalable pipeline using both host and microbial DNA to infer the host source of fecal material. We apply this pipeline to newly sequenced archaeological specimens and show that we are able to distinguish morphologically similar human and canine paleofeces, as well as non-fecal sediments, fro…
The role of expert evaluation for microsleep detection
2015
Abstract Recently, it has been shown by overnight driving simulation studies that microsleep density is the only known sleepiness indicator which rapidly increases within a few seconds immediately before sleepiness related crashes. This indicator is based solely on EEG and EOG and subsequent adaptive pattern recognition. Accurate microsleep recognition is very important for the performance of this sleepiness indicator. The question is whether expensive evaluations of microsleep events by a) experts are necessary or b) non-experts provide sufficient evaluations. Based on 11,114 microsleep events in case a) and 12,787 in case b) recognition accuracies were investigated utilizing (i) artificia…
VEBO: Validation of E-R diagrams through ontologies and WordNet
2012
In the semantic web vision, ontologies are building blocks for providing applications with a high level description of the operating environment in support of interoperability and semantic capabilities. The importance of ontologies in this respect is clearly stated in many works. Another crucial issue to increase the semantic aspect of web is to enrich the level of expressivity of database related data. Nowadays, databases are the primary source of information for dynamical web sites. The linguistic data used to build the database structure could be relevant for extracting meaningful information. In most cases, this type of information is not used for information retrieval. The work present…
Didáctica de las ciencias experimentales y sociales
2005
Resumen tomado del autor. Resumen también en inglés Tanto por las Naciones Unidas como por la Comisión Europea (COM, 1997) se insta al estudio, conservación y mejora de los sistemas acuáticos. En la Península Ibérica y hasta la fecha, los índices utilizados habitualmente para evaluar y determinar la calidad del agua basados en los macroinvertebrados tienen una aplicación restringida a los ríos, ya que, en los demás ecosistemas acuáticos (lagos, lagunas, humedades, etc.) el comportamiento de dichos índices parece que no aporta conclusiones fiables. Con el nuevo índice ecológico presentado en este trabajo 'Indice del Modo de Nutrición', se pretende evaluar la calidad de la estructura trófica …
Un curs d'Introducció a l'economia
2012
Un curs d'Introducció a l'economia Material docent corregit pel Servei de Política Lingüística. Bloc I. Conceptes bàsics i microeconomia Tema 1. Principis bàsics d’economia Tema 2. La demanda i l’oferta Tema 3. L’elasticitat i aplicacions Tema 4. L’oferta, la demanda i les polítiques del govern Tema 5. Els mercats i el benestar Tema 6. Introducció a la funció de producció i els mercats de factors. Bloc II. Macroeconomia Tema 7. Introducció. Conceptes bàsics de comptabilitat nacional Tema 8. Els determinants de la producció agregada a llarg termini Tema 9. Renda i despesa: l’estalvi, la inversió i els fluxos financers Tema 10. Diner i preus a llarg termini El document forma part dels materia…
Ruolo della fotocoagulazione laser nell’edema maculare diabetico: benefici e limiti
2012
Tourism-related informal interaction in Chembe, Malawi : an ethnographic study
2016
Tutkielmassa tarkastellaan turismin liittyvää vapaamuotoista kanssakäymistä paikallisten malawilaisten sekä ulkomaalaisten asukkaiden ja matkailijoiden välillä. Etnografinen pääaineisto on kerätty Malawissa keväällä 2013 ja se koostuu haastatteluista ja muistiinpanoista. Tosisijainen aineisto koostuu raporteista ja asiakirjoista, joiden tarkoitus on hahmotella ruohonjuuritason vuorovaikutukselle laajempi yhteiskunnallinen konteksti. Metodologisesti tutkielma hyödyntää ranskalaisen sosiologin ja etnologin Pierre Bourdieun esittelemää käytännön teoriaa ja sen keskeisiäkäsitteitä, jotka ovat kenttä, pääoma ja habitus. Tutkielman tarkoitus on valottaa niitä tekijöitä, jotka määrittävät eri toim…
Effects of defoliation on male and female reproductive traits of a perennial orchid, Dactylorhiza maculata
2000
1The effects of defoliation on male reproductive traits of plants have received little attention. We conducted two field experiments with Dactylorhiza maculata (L.) Soo to examine the effects of defoliation on both male and female reproductive traits. We removed 0, 50 or 100% of leaves prior to flowering. The quality of pollen was tested by transferring pollen from the differently treated plants to untreated plants of the same population. 2The non-defoliated plants did not differ from the defoliated plants in mass of pollinia. No differences were found in the weight of seed capsules or in the proportion of embryonic seeds raised by flowers receiving pollen from differently treated pollen do…