Search results for "beat"

Information transfer in QT-RR dynamics: Application to QT-correction

2018

ABSTRACTThe relation between the electrical properties of the heart and the beating rate is essential for the heart functioning. This relation is central when calculating the “corrected QT interval” — an important measure of the risk of potentially lethal arrhythmias. We use the transfer entropy method from information theory to quantitatively study the mutual dynamics of the ventricular action potential duration (the QT interval) and the length of the beat-to-beat (RR) interval. We show that for healthy individuals there is a strong asymmetry in the information transfer: the information flow from RR to QT dominates over the opposite flow (from QT to RR), i.e. QT depends on RR to a larger e…

Tapping doesn't help: Synchronized self-motion and judgments of musical tempo.

2019

For both musicians and music psychologists, beat rate (BPM) has often been regarded as a transparent measure of musical speed or tempo, yet recent research has shown that tempo is more than just BPM. In a previous study, London, Burger, Thompson, and Toiviainen (Acta Psychologica, 164, 70–80, 2016) presented participants with original as well as “time-stretched” versions of classic R&B songs; time stretching slows down or speeds up a recording without changing its pitch or timbre. In that study we discovered a tempo anchoring effect (TAE): Although relative tempo judgments (original vs. time-stretched versions of the same song) were correct, they were at odds with BPM rates of each stimulus…

Data from: Moving in the Anthropocene: global reductions in terrestrial mammalian movements

2019

Animal movement is fundamental for ecosystem functioning and species survival, yet the effects of the anthropogenic footprint on animal movements have not been estimated across species. Using a unique GPS-tracking database of 803 individuals across 57 species, we found that movements of mammals in areas with a comparatively high human footprint were on average one-half to one-third the extent of their movements in areas with a low human footprint. We attribute this reduction to behavioral changes of individual animals and to the exclusion of species with long-range movements from areas with higher human impact. Global loss of vagility alters a key ecological trait of animals that affects no…

Charles Bukowski – America’s Poet of the South

2019

One of the most expressive trends in American culture of the 1950s and 1960s, manifested by the treatment of travel as a motive of life in both the mental and creative spheres, can be confidently attributed to the Beat generation. Their consumption lifestyle, crazy undertakings, love and moral fights, in which they entered without any moderation, led them to living problems and, consequently, to being lost. This generation almost automatically brings to mind the portrait of young, vulnerable Americans, rebellious and lost, oppressed and radical, wanting freedom and falling into trouble. The myth of the Beat generation is one of the most distinct myths of American culture of the twentieth ce…

The Transfer Function of Non-Stationary Indoor Channels and its Relationship to System Functions of LFMCW Radars

2021

This paper studies the relationship between the time-variant (TV) channel transfer function (CTF) of non-stationary indoor channels and the system functions of linear frequency modulated continuous waves (LFMCW) radars. To do so, we consider a moving person/object in indoor environments, which is modelled by a cluster of moving point scatterers. It is shown that the TVCTF can be obtained from the beat signal of LFMCW radar systems. Analytical expressions are derived for the TV demodulated radar response, the complex channel gain, and the TV Doppler-delay profile. A relationship between the presented results and existing non-stationary indoor channel models assuming pulsed wave systems is al…

Dones i ciència. Quatre pioneres en el camp de la psicologia

2012

Una carrera científica normalment és una carrera d'obstacles, però en el cas de ser una dona s’afegeixen problemes i mecanismes d'exclusió específics.  Per tal de conèixer les estratègies utilitzats per superar alguns obstacles, al present article revisem les biografies de quatre psicòlogues que, entre 1890 i 1940, van intentar obtenir una formació acadèmica i van aconseguir fer una contribució pròpia a la ciència psicològica.

Modified hemi-Fontan procedure on the beating heart

1998

the heart by infusing the cardioplegic solution under aortic occlusion by means of the balloon throughout the procedure. Even though the balloon catheter passes through the aortic valve, significant aortic valve insufficiency is not likely to occur because of the small caliber of the balloon catheter. We believe that the clinical application of this double-lumen aortic occlusion catheter will protect the myocardium in patients with a thoracoabdominal aortic aneurysm or distal descending aortic aneurysm who undergo the operation through the left thoracotomy with DHCA.

Thinking outside the box: effects of modes larger than the survey on matter power spectrum covariance

2012

Considering the matter power spectrum covariance matrix, it has recently been found that there is a potentially dominant effect on mildly non-linear scales due to power in modes of size equal to and larger than the survey volume. This {\it beat coupling} effect has been derived analytically in perturbation theory and while it has been tested with simulations, some questions remain unanswered. Moreover, there is an additional effect of these large modes, which has so far not been included in analytic studies, namely the effect on the estimated {\it average} density which enters the power spectrum estimate. In this article, we work out analytic, perturbation theory based expressions including…

LA LEGGENDA DELLA BEATA EUSTOCHIA DA MESSINA EDIZIONE E STUDIO DI F (MS. II, 199, FERRARA)

2012

Effect of sulfur dioxide on mucociliary activity and ciliary beat frequency in guinea pig trachea

1994

The effects of 30 min exposure to sulfur dioxide on mucociliary activity (MCA) and ciliary beat frequency (CBF) were studied in 31 guinea pig tracheas. MCA was measured by recording the light reflected from ciliated mucous membranes using an infrared bar code reader. CBF of single ciliated cells obtained by brushing was measured with phase-contrast microscopy. Each tracheal sample was exposed to SO2 at concentrations ranging from 2.5 to 12.5 ppm, or to air for control purposes. MCA and CBF were measured before and immediately after gas exposure. A reduction in mean MCA of 63% (P = 0.0007) and statistically insignificant changes in CBF (P > 0.05) were recorded at concentrations of 2.5 PPM SO…