Search results for "Transform"
showing 10 items of 3975 documents
Automated detection and localization system of myocardial infarction in single-beat ECG using Dual-Q TQWT and wavelet packet tensor decomposition
2020
Background and objective. It is challenging to conduct real-time identification of myocardial infarction (MI) due to artifact corruption and high dimensionality of multi-lead electrocardiogram (ECG). In the present study, we proposed an automated single-beat MI detection and localization system using dual-Q tunable Q-factor wavelet transformation (Dual-Q TQWT) denoising algorithm. Methods. After denoising and segmentation of ECG, a fourth-order wavelet tensor (leads × subbands × samples × beats) was constructed based on thediscretewavelet packet transform (DWPT), to represent the features considering the information of inter-beat, intra-beat, inter-frequency, and inter-lead. To reduce the t…
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 …
Rewolucje i ich konsekwencje dla dystopijnych i antyutopijnych powieściowych światów. Przykłady z polskiej i czeskiej literatury
2016
Powieści o charakterze antyutopijnym i dystopijnym opisują świat po pewnej zmianie. Zmiana ta często przybierała formę rewolucji, gwałtownego zaprzeczenia, odwrócenia znanego porządku. W swoim artykule chciałabym przyjrzeć się literackim kreacjom takich przemian - które w utopijnych wariacjach prowadzą do zniewolenia - nie do wyzwolenia. W omawianych utworach rewolucja jest wynikiem działań postaci reprezentujących odmienne światopoglądy, jednak jej skutek często bywa taki sam niszczy, nie tworzy. Obawy twórców literackich odzwierciedlają znaną im rzeczywistość.
Considering safety issues in minimum losses reconfiguration for MV distribution networks
2009
This paper offers a new perspective over the traditional problem of the multiobjective optimal reconfiguration of electrical distribution systems in regular working state. The issue is indeed here formulated including also safety issues. Indeed, dimensioning the earth electrodes of their own secondary substations, distribution companies take into account the probable future configurations of the network due to transformations of overhead lines into cable lines or realization of new lines. On the contrary, they do not consider that, during normal working conditions. the structure of the network can be modified for long periods as a consequence of reconfiguration manoeuvres, with differences …
Spine and test skeletal matrices of the Mediterranean sea urchinArbacia lixula- a comparative characterization of their sugar signature
2015
15 pages; International audience; Calcified structures of sea urchins are biocomposite materials that comprise a minor fraction of organic macromolecules, such as proteins, glycoproteins and polysaccharides. These macromolecules are thought to collectively regulate mineral deposition during the process of calcification. When occluded, they modify the properties of the mineral. In the present study, the organic matrices (both soluble and insoluble in acetic acid) of spines and tests from the Mediterranean black sea urchin Arbacia lixula were extracted and characterized, in order to determine whether they exhibit similar biochemical signatures. Bulk characterizations were performed by mono-di…
La investigación sociocrítica en la educación física
2012
La investigación socialmente crítica en la educación física, aquélla que se realiza con el propósito de contribuir al cambio y la transformación social, se ha visto reconocida durante la última década. Sin embargo, posee una considerable tradición de estudios de este tipo. En este artículo se presentan los antecedentes cercanos y su evolución desde la década de 1980 a la actualidad. Se repasan las principales contribuciones de los inicios y del periodo de internacionalización que vivió este tipo de investigaciones, así como las principales orientaciones y áreas temáticas de interés. También se trazan los principales retos y perspectivas metodológicas y temáticas de futuro. El artículo final…
International Retirement Migration: Transforming Societies Through Purchasing Power?
2016
Despite a more than 40-year-old tradition of international retirement migration (IRM) in Europe, relatively little social scientific research has been carried out in this field. Retired European migrants have not been considered to be politically controversial (i.e. they are not viewed as having been the causes of social problems or as needy, poor or deprived). Often, the terms used in the 1980s and early 1990s to describe these populations have been linked not to a migration model but to the model of the social agent of a tourist. The chapter is divided into three parts: (1) a general overview of the flows and socio-economic characteristics of IRM in Europe, addressing the main regions of …
Engineered membranes for residual cell trapping on microfluidic blood plasma separation systems. A comparison between porous and nanofibrous membranes
2020
AbstractBlood-based clinical diagnostics require challenging limit-of-detection for low abundance, circulating molecules in plasma. Micro-scale blood plasma separation (BPS) has achieved remarkable results in terms of plasma yield or purity, but rarely achieving both at the same time. Here, we proposed the first use of electrospun polylactic-acid (PLA) membranes as filters to remove residual cell population from continuous hydrodynamic-BPS devices. The membranes hydrophilicity was improved by adopting a wet chemistry approach via surface aminolysis as demonstrated through Fourier Transform Infrared Spectroscopy and Water Contact Angle analysis. The usability of PLA-membranes was assessed th…
Development of digital export promotion measures in Latvia during the COVID-19 pandemic
2021
Bakalaura darba temats ir “Digitālo eksporta veicināšanas pasākumu attīstība Latvijā COVID-19 pandēmijas laikā” izstrādāts ar mērķi, analizējot Latvijas digitālos eksporta veicinošos pasākumus COVID-19 pandēmijas laikā, noteikt galvenās Latvijas eksporta digitālo veicinošo pasākumu problēmas un izstrādāt priekšlikumus to pilnveidošanai. Bakalaura darbā tiek pētīti digitālie eksporta veicinošie pasākumi Latvijā COVID-19 pandēmijas laikā. Uzsvars ir likts uz digitālo eksporta veicinošo pasākumu attīstību Latvijas eksporta veicinošajām iestādēm un Latvijas eksportējošiem uzņēmumiem COVID-19 pandēmijas laikā, un izmantojot ekspertu interviju ar Latvijas eksporta veicinošajām iestāžu ekspertiem …
Multipactor radiation analysis within a waveguide region based on a frequency-domain representation of the dynamics of charged particles
2009
[EN] A technique for the accurate computation of the electromagnetic fields radiated by a charged particle moving within a parallel-plate waveguide is presented. Based on a transformation of the time-varying current density of the particle into a time-harmonic current density, this technique allows the evaluation of the radiated electromagnetic fields both in the frequency and time domains, as well as in the near- and far-field regions. For this purpose, several accelerated versions of the parallel-plate Green's function in the frequency domain have been considered. The theory has been successfully applied to the multipactor discharge occurring within a two metal-plates region. The proposed…