Search results for "Distortion"
showing 10 items of 309 documents
Kognitīvo izkropļojumu saistība ar Es-koncepciju
2018
Pētījuma jautājumi: Kādas saistības pastāv starp dažādu kognitīvo izkropļojumu veidu izmantošanu un Es-koncepciju? Vai pastāv dzimumatšķirības kognitīvo izkropļojumu veidu izmantošanas biežumā/izteiktībā un Es-koncepcijas rādījumos? Vai un kā Es-koncepcijas un kognitīvo izkroplojumu izmantošanas biežuma saistības atšķiras sieviešu un vīriešu grupās? Izmantotās metodes: Kognitīvo izkropļojumu skala (Covin et. al., 2011), Negatīvo pārliecību skala, (Roberts, 2015) un Es-koncepcijas aptauja (Robson, 1989). Respondenti: 178 respondenti (no kuriem 106 sievietes), vecumā no no 16 līdz 74. Pētījuma rezultāti: kopumā pastāv statistiski nozīmīgas negatīvas saistības starp Es-koncepciju un kognitīvaj…
Distortion product otoacoustic emissions in healthy newborns: normative data.
1995
Distortion product otoacoustic emissions (DPOAE) offer an alternative to transiently evoked otoacoustic emissions (TEOAE) as an audiological test. The former can be used as a screening technique, and may also provide frequency-specific information about the functional state of the cochlea. We recorded DPOAE in a group of healthy newborns to establish the Characteristics of a DPOAE “audiogram” (DP-gram) in this population. The DP-gram can be obtained with characteristics quite similar to those observed in adults, with two sharp peaks of maximum amplitude at F2 frequencies of 2 kHz and 5-6 kHz, and a decline in DPOAE amplitude in mid frequencies. The results confirm the limitations of DPOAE r…
Emociju regulācijas saistība ar kognitīvajām pārliecībām
2020
Pētījuma mērķis bija noskaidrot, kādas saistības pastāv starp emociju regulācijas stratēģijām un kognitīvajām pārliecībām (un identificēt šīs saistības). Tika izvirzīts pētījuma jautājums: Kā emociju regulācijas stratēģijas ir saistītas ar kognitīvajām pārliecībām? Pētījumā tika izmantotas trīs aptaujas - Kognitīvo izkropļojumu skala (Cognitive Distortions Scale (CDS), Covin et. al., 2011), Negatīvo pārliecību skala (Inventory of Cognitive Distortions (ICD), Roberts, 2015) un Emociju regulācijas aptauja (Emotion regulation questionnaire (ERQ), Gross & John, 2003). Pētījumā piedalījās piecdesmit četri respondenti, no kuriem, no kuriem 42 bija sievietes un 12 bija vīrieši. Respondentu vecums …
Riferibilità dei contatori statici di energia reattiva in presenza di armoniche. Evoluzione normativa e prove sperimentali
2013
Traceability of static reactive energy meters in the presence of harmonics: theoretical considerations and a DAQ-based reference meter
2013
This paper deals with some problems related to the measurements traceability with static meters for reactive energy. These problems arise when the meters operate in the presence of harmonics, which can negatively affect their performances, depending on implemented metric. The paper analyzes the problem in the light of both in-force and draft standards, from the viewpoint of the performances of both commercial meters and reference standard instruments. The analysis is supported by some experimental tests, which are carried out by means of a reference meter, based on data acquisition boards, which can be used in both sinusoidal and distorted conditions.
On the calibration of reactive energy meters under non sinusoidal conditions
2009
This paper is focused on the problems related to the calibration of the reactive energy meters on the place of installation of the electricity meter (on-site), using the load of the same electrical system. In the presence of harmonic distortion, the behaviour of the meters can go out of the limits imposed by the theoretical calibration curve depending on the metric used by both reference standard meters and meters under test.
Asymptotic Hölder regularity for the ellipsoid process
2020
We obtain an asymptotic Hölder estimate for functions satisfying a dynamic programming principle arising from a so-called ellipsoid process. By the ellipsoid process we mean a generalization of the random walk where the next step in the process is taken inside a given space dependent ellipsoid. This stochastic process is related to elliptic equations in non-divergence form with bounded and measurable coefficients, and the regularity estimate is stable as the step size of the process converges to zero. The proof, which requires certain control on the distortion and the measure of the ellipsoids but not continuity assumption, is based on the coupling method.
A Curvature Based Method for Blind Mesh Visual Quality Assessment Using a General Regression Neural Network
2016
International audience; No-reference quality assessment is a challenging issue due to the non-existence of any information related to the reference and the unknown distortion type. The main goal is to design a computational method to objectively predict the human perceived quality of a distorted mesh and deal with the practical situation when the reference is not available. In this work, we design a no reference method that relies on the general regression neural network (GRNN). Our network is trained using the mean curvature which is an important perceptual feature representing the visual aspect of a 3D mesh. Relatively to the human subjective scores, the trained network successfully asses…
<title>Modified crossed-cylinder aberroscope</title>
2001
We report a technique to estimate eye aberrations, based mainly on the subjective crossed-cylinder method. In order to obtain accurate coordinates of cross sections of the aberration distorted grid image on the retinal plane, needed in subjective methods, fusion of two images is used. The image seen by the eye under investigation is fused by the patient with a similar grid generated and reshaped in the appropriate way on the computer screen. The computer simulated image is viewed either by the second eye (in order to avoid eye rivalry and suppression processes, that are typical for such conditions, stimuli for both eyes are discontinuous and are displayed sequentially with a frequency of 50…
IEEE Std. 1459 power quantities ratio approaches for simplified harmonic emissions assessment
2018
The paper investigates the suitability of using power ratio parameters for harmonic emissions assessment at the point of common coupling (PCC). The study is carried out starting from the IEEE Std. 1459-2010 apparent power decomposition, where power factors are defined for evaluating line utilization and harmonic pollution levels. In addition, the study investigates the behavior of new parameters, which are expressed in terms of ratio between IEEE Std. 1459-2010 power quantities. The study is carried out for both single-phase and three-phase case, also considering the presence of capacitors. ? 2018 IEEE.