Search results for " DOM"

Identification of a specific type of PD from acoustic emission frequency spectra

2001

The paper presents an attempt to apply spectral analysis tools in processing acoustic emission (AE) pulses generated by partial discharge (FD). The experimental part of the paper describes spark gaps generating four types of PD and specifies parameters of measured acoustic signals and recalls the system used for measurement and analysis of the frequency spectra. Also, a spectral analysis procedure is presented, and frequency-domain descriptors characterizing AE pulses are defined. The results of the analysis are given both as time plots and amplitude and energy density spectra, related to values of the associated descriptors. The spectral analysis results cover AE pulses generated in system…

Comparative analysis of acoustic emission signals generated by electrical discharges measured by the hydrophone and the wideband contact transducer

2005

The paper presents a comparative analysis of the acoustic emission (AE) pulses and signals generated by PDs. For this purpose the measurements of the acoustic emission signals generated by PDs were taken in the multipoint-plane system using a hydrophone placed directly in the area of discharge generation, and the AE pulses using a piezoelectric contact transducer which was on a side wall of a power transformer tub. Next, time runs and amplitude density spectra were drawn. Also the descriptors describing signals in the frequency domain were determined and the time-frequency analysis was carried out, which determined spectrograms for the energy density spectrum.

Investigating the level of significance of the coherence function in cardiovascular variability analysis

2002

Although the presence of significant coupling between cardiovascular variability series is usually verified according to the threshold value of 0.5 in the coherence function (CF), spectral estimator parameters should also be considered. In this study, the surrogate data technique was introduced to define the level of significance of the CF. The proposed method determined a frequency-dependent threshold over which the hypothesis of zero coherence was rejected. The weighted covariance method and the autoregressive method were used to estimate the CF on simulated series with different degrees of linear coupling and on real cardiovascular data. The threshold was dependent on the type and parame…

The Navier–Stokes equations in exterior Lipschitz domains: L -theory

2020

Abstract We show that the Stokes operator defined on L σ p ( Ω ) for an exterior Lipschitz domain Ω ⊂ R n ( n ≥ 3 ) admits maximal regularity provided that p satisfies | 1 / p − 1 / 2 | 1 / ( 2 n ) + e for some e > 0 . In particular, we prove that the negative of the Stokes operator generates a bounded analytic semigroup on L σ p ( Ω ) for such p. In addition, L p - L q -mapping properties of the Stokes semigroup and its gradient with optimal decay estimates are obtained. This enables us to prove the existence of mild solutions to the Navier–Stokes equations in the critical space L ∞ ( 0 , T ; L σ 3 ( Ω ) ) (locally in time and globally in time for small initial data).

Meccanismi riduttivi anatomici e mentali.

2008

La atención médica de los animales durante la Baja Edad Media en los reinos hispánicos

2011

Durante la Baja Edad Media, muchos animales de los que el hombre sacó un provecho recibieron atención médica (equinos, animales de granja, rebaños trashumantes, animales de colecciones zoológicas). La mayor parte de estas atenciones se llevaron a cabo dentro del marco doméstico y por las mismas personas que los tenían a su cargo, gracias a sus conocimientos empíricos transmitidos de generación en generación de forma oral, pero a veces también escrita. Solamente para el cuidado de algunos animales de elevado precio surgió un grupo de individuos que se dedicaron con mucha mayor intensidad, y a veces haciendo de ello su oficio, especialmente para tener cuidado de su salud (albéitares, halconer…

Contribution of sponge genes to unravel the genome of the hypothetical ancestor of Metazoa (Urmetazoa)

2001

Recently the term Urmetazoa, as the hypothetical metazoan ancestor, was introduced to highlight the finding that all metazoan phyla including the Porifera (sponges) are derived from one common ancestor. Sponges as the evolutionarily oldest, still extant phylum, are provided with a complex network of structural and functional molecules. Analyses of sponge genomes from Demospongiae (Suberites domuncula and Geodia cydonium), Calcarea (Sycon raphanus) and Hexactinellida (Aphrocallistes vastus) have contributed also to the reconstruction of the evolutionary position of Metazoa with respect to Fungi. Furthermore, these analyses have provided evidence that the characteristic evolutionary novelties…

Interaction of theEscherichia colitransporter DctA with the sensor kinase DcuS: presence of functional DctA/DcuS sensor units

2012

The aerobic Escherichia coli C(4) -dicarboxylate transporter DctA and the anaerobic fumarate/succinate antiporter DcuB function as obligate co-sensors of the fumarate responsive sensor kinase DcuS under aerobic or anaerobic conditions respectively. Overproduction under anaerobic conditions allowed DctA to replace DcuB in co-sensing, indicating their functional equivalence in this capacity. In vivo interaction studies between DctA and DcuS using FRET or a bacterial two-hybrid system (BACTH) demonstrated their interaction. DctA-YFP bound to an affinity column and was able to retain DcuS. DctA shows substantial sequence and secondary structure conservation to Glt(Ph), the Na(+)/glutamate sympo…

Literackie wizerunki chłopców i mężczyzn w prozie historycznej Antoniny Domańskiej. Między tradycją a nowatorstwem

2019

When depicting boys and men, Antonina Domańska is well aware of the recipients and their needs. Her fictional characters are often teenage boys who find themselves in the middle of the action. Their adventures are building blocks of the plot and encourage the recipients to read on. The author focuses on the child’s naturę in the first place, and the principles come afterwards. Domańska depicts progressive, at the time, relations between adults and children. The characters include commoners who are presented as role models (e.g. Wawrzuś), or people who improve themselves every day and are always ready to help others. Collective characters (such as pageboys) are instigators of pranks and othe…

SUCCESSO E DECLINO DELLA SCUOLA GENOVESIANA IN SICILIA SUL FINIRE DEL XVIII E IL PRINCIPIO DEL XIX SECOLO

2021

In the Sicily of late 18th century, during the harshest contraposition between viceroyal government and parliamentary baronage, the Genovesian school gains a great success on the island among scholars and academicians as well as ruling class. In this particular moment of Sicilian history, the theme of reforms is at the top of the political agenda and the thought of Genovesi and his scholars spurs projects to reform the old institutions of the Kingdom, to modernize agriculture, raise productivity and introduce a fairer taxation. The reputation of the Neapolitan school is so well-known that all the parties are inspired by Its economic and political proposals. Furthermore, the Crown and the ba…