111,895 research outputs found
Noise power reduction through comparison with another statistically dependent noise
No full textConsider a signal s(t) in presence of an additive noise n(t) and suppose that another noise v(t), statistically dependent on n(t), is available. This paper discusses the problem of the above mentioned statistical dependence in order to reduce the power of the noise n(t). No hypotheses on the signal nature are being made. The use of linear networks is examined in detail and we show how the noise power can be reduced to a lower limit which depends on the cross-correlation function of n(t) and v(t)
Cross-Correlation and Statistical Dependence between Envelope and Frequency Deviation of a Sine Wave plus Random Noise
No full textCross-correlation and statistical dependence between the envelope V(t) and angular frequency deviation Φ’(t) of a sine wave plus random noise are discussed with a view to possible application to frequency demodulation. In particular it is shown that the cross-correlation function RΦ’V(τ) vanishes because the joint probability density p2(Φ1’, V2; τ) turns out to be an even function of Φ1’. Besides, a short discussion on some features of the phase deviation allows not only to show that V(t) and Φ’(t), while uncorrelated, are not independent, but also, by a different method, to prove once more the vanishing of RΦ’V(τ)
Nitric oxide metabolites and erythrocyte deformability in a group of subjects with obstructive sleep apnea syndrome.
No full textOur aim was to evaluate nitric oxide metabolites (nitrite and nitrate), expressed as NOx, and erythrocyte deformability, expressed as elongation index, in a group of subjects with obstructive sleep apnea syndrome (OSAS). We enrolled 48 subjects (36 men and 12 women; mean age 50.3 ± 14.68 yrs) with OSAS diagnosed after a 1-night cardiorespiratory sleep study. OSAS severity was assessed evaluating the apnea/hypopnea index (AHI) and subjects were subdivided in two subgroups: Low (L = AHI 30). NOx was examined converting nitrate into nitrite with a nitrate reductase and then assessing nitrite with spectrophotometry after the addition of Griess reagent. The elongation index was obtained using the diffractometer Rheodyn SSD of Myrenne at shear stresses of 30 and 60 Pa and it was expressed as elongation index (EI). We found no difference in NOx among the entire group of OSAS subjects and normal controls, while we observed a NOx decrease in the H subgroup in comparison with L subgroup, but not in comparison with normal controls. We noted a significant decrease in EI at each shear stress in the entire group and also in the two subgroups in comparison with controls. The decrease in NO bioavailability and in erythrocyte deformability might contribute to explain the increased cardiovascular risk in OSAS subjects
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Influence of risk factors on nitric oxide metabolites at the initial stage of juvenile acute myocardial infarction.
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Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Deformabilità eritrocitaria e metaboliti dell'ossido nitrico in un gruppo di soggetti con sindrome delle apnee ostruttive nel sonno
No full textVariations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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