Results 191 to 200 of about 15,545,791 (242)

Resistance to Overdoping Allows Over 2000 S cm−1 Conductivity in P(g3BTTT) With Anion‐Exchange Doping

Advanced Materials, EarlyView.
Anion‐exchange doping of conjugated polymers is an effective way to achieve high conductivities. Here, we report over 2000 S cm−1 electrical conductivity for doped P(g3BTTT). In addition, we show that P(g3BTTT) sustains exceptionally high doping levels without any drop in the charge mobility.
Basil Hunger, Maximilian M. Horn, Eva Röck, Diego Rosas Villalva, Lize Bynens, Jochen Vanderspikken, Christina Kousseff, Silène Gobeil, Olivier Bardagot, Nesibe Akmanşen‐Kalayci, Sarah H. Tolbert, Iain McCulloch, Wouter Maes, Demetra Tsokkou, Natalie Banerji   +14 more
wiley   +1 more source

Pulse Transit Time as a Proxy for Vasoconstriction in Younger and Older Adults [PDF]

Experimental Gerontology, 2020
Objectives: Changes of vasoconstriction may be measured non-invasively using pulse transit time. This study assessed the sensitivity, test-retest reliability and validity of pulse transit time during vasoconstriction provocation and active standing, and ...
Richard Van Wezel, Andrea Maier, Carel G M Meskers   +2 more
exaly   +2 more sources

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Pulse Transit Time as an Indicator of Arterial Blood Pressure

Psychophysiology, 1981
ABSTRACT The relationship between pulse‐arrival times and diastolic blood pressure was measured in 10 anesthetized dogs. The pulse‐arrival time was measured using the R‐wave of the electrocardiogram (ECG) as a time reference. Pulse‐transit time was also measured between the carotid and femoral pulses.
C F Babbs, J D Bourland, L A Geddes
exaly   +3 more sources

Comparison of Noninvasive Pulse Transit Time Estimates as Markers of Blood Pressure Using Invasive Pulse Transit Time Measurements as a Reference

Physiological Reports, 2016
Pulse transit time (PTT) measured as the time delay between invasive proximal and distal blood pressure (BP) or flow waveforms (invasive PTT [I-PTT]) tightly correlates with BP PTT estimated as the time delay between noninvasive proximal and distal arterial waveforms could therefore permit cuff-less BP monitoring. A popular noninvasive PTT estimate for
Ramakrishna Mukkamala
exaly   +3 more sources

System for thermal measurement of pulse-transit-time

2008 IEEE International Symposium on Circuits and Systems (ISCAS), 2008
This work lays out our investigation into the noninvasive, automatic measurement of blood pressure. We have investigated the use of a thermal camera to detect changes in surface temperature due to the pulse in the radial and ulner arteries and then moved on to detecting the same pulse using a low-cost thermistor.
Matthew R. James, Stefano Gregori, Dalia Fayek   +2 more
openaire   +2 more sources

Pulse arrival time is not an adequate surrogate for pulse transit time as a marker of blood pressure

Journal of Applied Physiology, 2011
Pulse transit time (PTT) is a proven, simple to measure, marker of blood pressure (BP) that could potentially permit continuous, noninvasive, and cuff-less BP monitoring (after an initial calibration). However, pulse arrival time (PAT), which is equal to the sum of PTT and the pre-ejection period, is gaining popularity for BP tracking, because it is ...
Guanqun, Zhang, Mingwu, Gao, Da, Xu, N Bari, Olivier, Ramakrishna, Mukkamala   +4 more
openaire   +2 more sources

The System to Study Pulse Transit Time Measurement Error

2020 9th Mediterranean Conference on Embedded Computing (MECO), 2020
The article considers software-hardware implementation of the system to study the errors in pulse transit time measurement methods. Flexible and powerful possibilities of software tools in the form of virtual instruments capable to set and reproduce forms and parameters of test signals as well as probabilistic characteristics of interferences are shown.
Sergey G. Gurzhin, Vladimir I. Zhulev, Michail B. Kaplan, Evgeniy M. Proshin, Andrey V. Shulyakov   +4 more
openaire   +2 more sources

Pulsed Ultrasonic Transit Time Flowmeter

IRE Transactions on Bio-Medical Electronics, 1962
The difference in effective velocity of sound pulses propagated alternately upstream and downstream through moving blood is a measure of the blood velocity. A blood flowmeter based on this principle has been developed and employed in routine experiments over a period of four years.
D. L. Franklin, D. W. Baker, R. F. Rushmer   +2 more
openaire   +1 more source

Pulse Transit Time and Blood Pressure: An Intensive Analysis

Psychophysiology, 1983
ABSTRACTRelationships between pulse transit time (PTT) and intra‐arterial systolic (SBP), diastolic (DBP), and mean arterial blood pressure (MAP) were examined in 4 subjects under three conditions: rest, paced respiration, and mental arithmetic. PTT was measured from the EKG R‐wave to two peripheral pulses (brachial and radial) and from one pulse to ...
James D Lane, J D Lane, D Shapiro
exaly   +3 more sources

Effects of Exercise on the Pulse Transit Time

2004 2nd IEEE/EMBS International Summer School on Medical Devices and Biosensors, 2006
Pulse transit time (PTT) is one of the important physiological parameters that can be utilized to predict arterial blood pressure for noninvasive diagnosis and monitoring of cardiovascular diseases. However, the effects of exercise on PTT have not yet been studied systematically.
Y.M. Wong, Y.T. Zhang
openaire   +1 more source