Results 81 to 90 of about 2,142 (216)

Acute intermittent hypercapnic hypoxia augments left ventricular contractility

The Journal of Physiology, EarlyView.
Abstract figure legend Twenty‐four healthy adults were studied to determine the effects of an acute session of 40 min of intermittent hypercapnic hypoxia on cardiac performance. Cardiac function was assessed via echocardiography at rest and during graded stages of lower‐body negative pressure before and after the intervention to quantify load ...
Scott F. Thrall, Alex M. Williams, Philip J. Millar, Megan L. Lance, Brooke M. Shafer, Conan L. H. Shing, Jordan D. Bird, Christopher R. West, Glen E. Foster   +8 more
wiley   +1 more source

Noise characteristics in Zenith Total Delay from homogeneously reprocessed GPS time series [PDF]

, 2017
Zenith Total Delay (ZTD) time series, derived from the re-processing of Global Positioning System (GPS) data, provide valuable information for the evaluation of global atmospheric reanalysis products such as ERA-Interim.
Klos, Anna, TEFERLE, Felix Norman, Furqan Ahmed, Kibrom Ebuy Abraha, Addisu Hunegnaw, Felix Norman Teferle, ABRAHA, Kibrom Ebuy, HUNEGNAW, Addisu, Janusz Bogusz, Ahmed, Furqan, Anna Klos, Bogusz, Janusz   +11 more
core   +1 more source

MSWD: A Hybrid Machine‐Learning Framework for Slant Wet Delay Modeling

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.
Abstract Space geodetic techniques such as Global Navigation Satellite Systems (GNSS) and Very Long Baseline Interferometry (VLBI) are limited by direction‐dependent tropospheric delays, with slant wet delay (SWD) being the most variable component and a major error source.
Zhenyi Zhang, Benedikt Soja
wiley   +1 more source

Point-scale IWV and zenith total delay (ZTD) derived for 66 stations of the global navigation satellite system (GNSS) Upper Rhine Graben network (GURN)

, 2021
The ground-based global navigation satellite system (GNSS) technic was employed to retrieve the integrated water vapor (IWV) at 66 stations of the GNSS Upper Rhine Graben network (GURN).
Kutterer, Hansjörg, Yuan, Peng
core   +1 more source

GNSS Zenith Wet Delay as a Boundary Layer Diagnostic: Regime‐Dependent Turbulence Signatures From Large Eddy Simulation and Observations

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.
Abstract Global Navigation Satellite Systems (GNSS) provide continuous measurements of zenith wet delay (ZWD), reflecting column‐integrated atmospheric water vapor. While the slowly varying ZWD is routinely assimilated in numerical weather prediction, the rapid fluctuations on timescales of seconds to minutes that arise from boundary‐layer turbulence ...
Gaël Kermarrec, Tim Schrader, Xavier Calbet, Zhiguo Deng   +3 more
wiley   +1 more source

Variability of GPS-derived zenith tropospheric delay and some result of its assimilation into numeric atmosphere model

, 2020
The total zenith tropospheric delay (ZTD) is an important parameter of the atmo- sphere and directly or indirectly reflects the weather processes and variations.
Khutorova O., Khutorov V., Kalinnikov V., Kurbangaliev T., Teptin G.   +4 more
core  

Green Emissions of Atomic Oxygen at Sprite Tops Explained

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Green emissions from excited Oxygen in Sprite Tops (GhOSTs) are due to the 557 nm photons emitted from atomic oxygen (O) $(\mathrm{O})$ excited to the 1S state. In this work we compare the possible contribution of various mechanisms for excitation of O(S1) $\mathrm{O}({}^{1}S)$ under application of a lightning‐induced electric field to the ...
Brandon Smith, Reza Janalizadeh, Victor P. Pasko   +2 more
wiley   +1 more source

Respiratory Organ‐on‐a‐Chip for Disease Modeling: From Architecture to Functional Integration

Advanced Healthcare Materials, Volume 15, Issue 23, 19 June 2026.
Respiratory organ‐on‐a‐chip (ROC) models capture key mechanical and cellular cues of the human respiratory system, enabling quantitative dissection of disease mechanisms. This review links ROC architectures to disease modeling, functional integration, and commercialization, and proposes a decision framework that aligns model complexity with mechanistic
Jinzhuo Hu, Yongjie Tang, Sidi Liu, Tao Xu, Qian Liu   +4 more
wiley   +1 more source

Three‐Year Characterization of Boundary Layer Dynamics From GNSS Zenith Wet Delay Spectral Analysis

Atmospheric Science Letters, Volume 27, Issue 6, June 2026.
Three years of GNSS zenith wet delay observations at Payerne reveal that spectral parameters—cutoff frequency α and variance σ2—capture robust seasonal cycles in boundary layer turbulence (R2 = 0.54 for α). Their inverse coupling tightens to r = −0.82 under summer convection, encoding regime‐dependent physics.
Gaël Kermarrec, Xavier Calbet, Zhiguo Deng   +2 more
wiley   +1 more source

Simultaneous Retrieval of PWV and VTEC by Low‐Cost Multi‐GNSS Single‐Frequency Receivers

Earth and Space Science, 2019
Precipitable water vapor (PWV) and ionospheric vertical total electron content (VTEC) are two essential components of space‐atmosphere parameters. The zenith troposphere delay can be converted into PWV, which plays a crucial role in meteorological ...
Chuanbao Zhao, Baocheng Zhang, Wei Li, Yunbin Yuan, Min Li   +4 more
doaj   +1 more source