Results 21 to 30 of about 267,292 (245)

Superluminal optical pulse propagation in nonlinear coherent media [PDF]

, 2002
The propagation of light-pulse with negative group-velocity in a nonlinear medium is studied theoretically. We show that the necessary conditions for these effects to be observable are realized in a three-level $\Lambda$-system interacting with a ...
A. Dogariu, A. Lezama, A.M. Akulshin, A.M. Steinberg, A.M. Steinberg, A.Yu. Andreev, B. Segard, C. Liu, C.G.B. Garrett, D. Budker, D. Budker, D. Grischkowsky, D. Grischkowsky, D.F. Phillips, D.L. Fisher, E.L. Bolda, G. Diener, G. Diener, G. Kurizki, L.J. Wang, L.V. Hau, M. Blaauboer, M.M. Kash, N.G. Basov, R.Y. Chiao, R.Y. Chiao, Ruben G. Ghulghazaryan, S. Chu, S.E. Harris, S.E. Harris, V.A. Sautenkov, Yuri P. Malakyan   +31 more
core   +2 more sources

A review of machine learning techniques in photoplethysmography for the non-invasive cuff-less measurement of blood pressure [PDF]

, 2020
Hypertension or high blood pressure is a leading cause of death throughout the world and a critical factor for increasing the risk of serious diseases, including cardiovascular diseases such as stroke and heart failure.
El-Hajj, C., Kyriacou, P. A.
core   +1 more source

Comparison of sequentially measured Aloka echo-tracking one-point pulse wave velocity with SphygmoCor carotid–femoral pulse wave velocity

SAGE Open Medicine, 2013
Objectives: Recently, echo-tracking-derived measures of arterial stiffness have been introduced in clinical practice for the assessment of one-point pulse wave velocity.
Olga Vriz, Caterina Driussi, Salvatore La Carrubba, Vitantonio Di Bello, Concetta Zito, Scipione Carerj, Francesco Antonini-Canterin   +6 more
doaj   +1 more source

Elevated levels of urine isocitrate, hydroxymethylglutarate, and formiminoglutamate are associated with arterial stiffness in Korean adults

Scientific Reports, 2021
Recent evidence suggests that cellular perturbations play an important role in the pathogenesis of cardiovascular diseases. Therefore, we analyzed the association between the levels of urinary metabolites and arterial stiffness. Our cross-sectional study
Ji-Hee Haam, Young-Sang Kim, Doo-Yeoun Cho, Hyejin Chun, Sang-Woon Choi, Yun Kyong Lee, Sang Wook Lim, Hyung Suk Koo, Moon Jong Kim   +8 more
doaj   +1 more source

Possibilities of using the ultrasonic wave transmission method to estimate initial setting time of cement paste [PDF]

, 2008
In this paper, the applicability of the ultrasonic wave transmission method to estimate the initial setting time of an arbitrary cement paste is discussed. Ultrasonic pulse velocity measurements were fully automated and measured continuously.
Chotard, Franci Kavčič, Goran Turk, Gregor Trtnik, Grosse, Hewlett, Kamada, Keating, Krauss, Lee, M Sayers, Rapoport, Reinhardt, Sun, Valič, Violeta Bokan Bosiljkov, Voigt, Voigt, Voigt, Voigt   +19 more
core   +2 more sources

Comparison of arterial stiffness indices measured by pulse wave velocity and pulse wave analysis

Blood Pressure, 2019
Objective: Arterial stiffness indices measured by pulse wave velocity and pulse wave analysis have been widely studied in different populations. Only a few small studies have been reported regarding these two measurement methods.
Hongyan Zhu, Yuan Gao, Huiling Cheng, Yichao Lu, IokFai Cheang, Dongxu Xu, Wenming Yao, Tianbao Xu, Fang Zhou, Yanli Zhou, Fang Xu, Xiangqing Kong, Xinli Li, Haifeng Zhang   +13 more
doaj   +1 more source

Association between increased arterial stiffness and clinical outcomes in patients with early sepsis: a prospective observational cohort study

Intensive Care Medicine Experimental, 2019
Background Conduit arteries, especially the aorta, play a major role in ensuring efficient cardiac function and optimal microvascular flow due to their viscoelastic properties.
Sigita Kazune, Andris Grabovskis, Corrado Cescon, Eva Strike, Indulis Vanags   +4 more
doaj   +1 more source

Changes in AZGP1 Serum Levels and Correlation With Pulse Wave Velocity After Kidney Transplantation

Frontiers in Cardiovascular Medicine, 2021
Background: Zinc-alpha 2-glycoprotein (AZGP1), a secreted protein with ubiquitous tissue expression, has been controversially linked to the risk of cardiovascular disease.
Thomas Daniel Kraemer, Inga Soerensen-Zender, Nima Memaran, Hermann Haller, Anette Melk, Bernhard Magnus Wilhelm Schmidt, Roland Schmitt   +6 more
doaj   +1 more source

Difficulties in the measurement of pulse-wave velocity [PDF]

American Heart Journal, 1958
The methods employed in the measuring of pulse-wave velocity are subject to gross error because of alinearity and frequency distortion resulting from low-resonance frequencies of instrumentation and arterial segment and extraneous tissue interference.
openaire   +4 more sources

Validity and reproducibility of arterial pulse wave velocity measurement using new device with oscillometric technique: A pilot study

BioMedical Engineering OnLine, 2005
Background Availability of a range of techniques and devices allow measurement of many variables related to the stiffness of large or medium sized arteries. There is good evidence that, pulse wave velocity is a relatively simple measurement and is a good
Patnaik Amar, Yashmaina Sridhar, Reddy Budda, Naidu Madireddy, Rani Pingali   +4 more
doaj   +1 more source