Results 231 to 240 of about 17,589,042 (280)

Efficient Cholesteric Liquid Crystal Waveguide Polarizing Splitters for High‐Sensitivity Chip‐Scale Atomic Magnetometry

Advanced Science, EarlyView.
An integrated polarimetry architecture based on a cholesteric liquid crystal waveguide polarization splitter overcomes the volumetric bottleneck in chip‐scale atomic magnetometers. By leveraging Bragg‐selective reflection and total‐internal‐reflection‐induced helicity inversion, this ultrathin device enables efficient circular polarization splitting ...
Zhibo Cui, Chuang Wang, Xiangyang Zhou, Gaopu Hou, Jinsheng Hu, Mao Ye, Xu Xiao, Zhen Chai, Yishi Weng, Yuning Zhang   +9 more
wiley   +1 more source

Nursing care of patients with vasovagal syncope undergoing head-up tilt test

Huli yanjiu, 2004
耿霞
doaj  

Additive Manufacturing of High‐Performance Polymers for Extreme Environments

Advanced Science, EarlyView.
Additive manufacturing of high‐performance polymers for extreme environments is critically reviewed through an integrated chemistry‐processing‐structure‐property‐qualification framework. The review compares fused filament fabrication, selective laser sintering, and direct ink writing, linking rheology and thermal history to crystallization, defect ...
Md Tofazzal Hossain, Mohammed Intishar Nur, Md Shajedul Hoque Thakur, Indranil Dey, Md Mesbahul Maruf, Md Jahid Hasan, Suryasarathi Bose, Muhammad M. Rahman   +7 more
wiley   +1 more source

Modular Metamaterials for Adaptable MRI Signal Control: Combining Dipole Array With a New Hexagon‐Based Artificial Dielectrics

Advanced Science, EarlyView.
A flexible, hexagonally packed artificial dielectric providing a wide range of effective permittivities (εr ≈ 30–1400) without lumped elements was developed for clinical and ultra‐high‐field MRI. Combined with modular passive‐dipole arrays, the system enables adaptable RF field shaping through electric‐ and magnetic‐dipole tuning.
Santosh Kumar Maurya, Ilan Goldberg, Rita Schmidt   +2 more
wiley   +1 more source

Dual pKa Lipid Nanoparticles for Lung‐tropic mRNA Delivery and pH‐Programmed Endosomal Escape

Advanced Science, EarlyView.
Lipid nanoparticles’ bottleneck lies in low endosomal escape efficiency and liver‐dominant delivery after intravenous administration. To overcome these limitations, we present a stepwise pH‐programmed lipid nanoparticle system enabled by our newly synthesized ionizable lipid.
Seong Gi Lim, Minju Lee, Yiming Wang, Eunjin Choi, Ji Sun Park, Kyungmin Park, Hayoung Jeon, Donghyun Kim, Donghyun Lee, Yeeun Lee, Kee‐Pyo Kim, Eunha Kim, Heebeom Koo   +12 more
wiley   +1 more source

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Prediction of Head-Up Tilt Test Result: Is it Possible?

Pacing and Clinical Electrophysiology, 2010
The determination of early, accurate, predictive criteria for a positive result would permit a reduction in the duration of the head-up tilt testing (HUTT). Previous studies propounded that existence of early sympathetic overreactivity (rapid and sustained increase in heart rate) during HUTT predicts positive result.
Turk U., Alioglu E., Kirilmaz B., Duygu H., Tuzun N., Tengiz I., Zoghi M., Ercan E.   +7 more
openaire   +4 more sources

Relevance of asystole during head-up tilt testing

The American Journal of Cardiology, 1995
The prognosis of patients manifesting prolonged asystole during head-up tilt testing is unclear. In 209 consecutive patients with a history of syncope and positive head-up tilt tests, 19 had asystole lasting > 5 seconds (mean duration 15 +/- 10) (group 1a).
DHALA A, NATALE A, SRA J, DESHPANDE S, BLANCK Z, JAZAYERI MR, AKHTAR M   +6 more
openaire   +2 more sources

Effect of passive tilting duration on the outcome of head-up tilt testing

Acta Cardiologica, 2007
We sought to compare the results of head-up tilt test (HUT) using the most common protocols, namely the Italian and Westminster prolonged by nitroglycerin (modified Westminster) protocols. We also investigated the role of passive tilting duration on HUT outcome.From 478 syncopal patients 306 (64%) individuals showed positive tilting results (HUT ...
Malgorzata, Lelonek, Adam, Stanczyk, Jan Henryk, Goch   +2 more
openaire   +3 more sources

Head-Up Tilt: A Useful Test for Investigating Unexplained Syncope.

Lancet, The, 1986
Head-up tilt, a recognised stimulus to vasovagal syncope, was used to investigate syncope that remained unexplained despite full clinical and electrophysiological assessment in fifteen patients, mean age 65 +/- 10 years, who had had 15 +/- 19 episodes of unexplained syncope over periods of a week to 26 years.
Richard Sutton, J Bayliss, Ann Ingram
exaly   +3 more sources

Prolonged asystole provoked by head-up tilt testing

Clinical Research in Cardiology, 2006
We describe a patient with a history of neurocardiogenic syncopes who had a positive headup tilt test that resulted in an lasting asystole lasting 34 seconds. However, the previously carried out Schellong test with a 30-min phase of standing showed a normal result. The patient showed typical orthostatic symptoms while tilted at the angle of 75 degrees.
R, Winker, M, Frühwirth, P, Saul, H W, Rüdiger, T, Pezawas, H, Schmidinger, M, Moser   +6 more
openaire   +2 more sources