Results 81 to 90 of about 5,696 (229)

Adaptive particle image velocimetry based on sharpness metrics

Journal of the European Optical Society-Rapid Publications, 2018
Background Optical distortions can significantly deteriorate the measurement accuracy in particle image velocimetry systems. Such distortions can occur at fluctuating phase boundaries during flow measurement and result from the accompanied refractive ...
M. Teich, J. Grottke, H. Radner, L. Büttner, J. W. Czarske   +4 more
doaj   +1 more source

Slow Transit Constipation: Pathophysiological Perspectives and Management Updates

Journal of Digestive Diseases, EarlyView.
Slow transit constipation (STC) is a complex neuromuscular disorder driven by interstitial cells of Cajal (ICCs) loss and enteric neuropathy. Diagnosis relies on objective transit testing while excluding pelvic floor dysfunction. Management follows a stepwise, phenotype‐driven approach, progressing from conventional laxatives to emerging targeted ...
Athanasios Syllaios, Stavros P. Papadakos, Alexandros Ioannou, Maximos Frountzas, Dimosthenis Michelakis, Dimitrios Patsouras, Spyridon Dritsas, Manousos‐Georgios Pramateftakis, Dimitrios Schizas   +8 more
wiley   +1 more source

Corneal power modelling with OCT data – Thin and thick lens paraxial models versus raytracing

Acta Ophthalmologica, EarlyView.
Abstract Background Evaluating keratometric power with Zeiss index (PKZ), paraxial thick cornea power (Gullstrand [PG]) and power referenced to the front (PFV) and back vertex plane (PBV) and raytracing power (PR), and modelling the deviation from PKZ with a multivariable linear prediction model.
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Peter Hoffmann, Jascha Wendelstein   +4 more
wiley   +1 more source

Single-Shot Wavefront Sensing in Focal Plane Imaging Using Transformer Networks

Optics
Wavefront sensing is an essential technique in optical imaging, adaptive optics, and atmospheric turbulence correction. Traditional wavefront reconstruction methods, including the Gerchberg–Saxton (GS) algorithm and phase diversity (PD) techniques, are ...
Hangning Kou, Jingliang Gu, Jiang You, Min Wan, Zixun Ye, Zhengjiao Xiang, Xian Yue   +6 more
doaj   +1 more source

Minimization of thermal deformation in crystal optics for high-repetition-rate FEL. [PDF]

J Synchrotron Radiat
Thermal deformation in X‐ray crystal optics in high‐repetition‐rate X‐ray free‐electron lasers can be effectively reduced by cryogenic cooling with liquid nitrogen, and possibly by second‐order correction via focusing optics.Minimizing thermal deformation in X‐ray crystal optics is crucial for preserving coherence and wavefront in high‐repetition‐rate ...
Zhang L, Hastings J, Huang Z, Torras JP, Zhu D.   +4 more
europepmc   +2 more sources

Spatial Light Modulator for wavefront correction

, 2009
12 figures, 2 tables, in modified format (10 pages), published in the proceedings of International Conference on Trends in Optics and Photonics., (Ajay Ghosh and Debesh Choudhury, eds.) March 2009, Kolkata, India., pp.
Vyas, Akondi, Roopashree, M. B., Banyal, Ravinder Kumar, Prasad, B. Raghavendra   +3 more
openaire   +2 more sources

Advances in cardiac devices and bioelectronics augmented with artificial intelligence

The Journal of Physiology, EarlyView.
Abstract figure legend Interfaces between the human heart, diagnostic bioelectronics, artificial intelligence, and clinical care. From left to right: Human heart and biosensor interface; representative waveforms of common diagnostic bioelectronic sensing modalities.
Charles Stark, Eric Rytkin, Andrei Alexandru Mircea, Igor R. Efimov   +3 more
wiley   +1 more source

In silico modelling of multi‐electrode arrays for enhancing cardiac drug testing on hiPSC‐CM heterogeneous tissues

The Journal of Physiology, EarlyView.
Abstract figure legend Schematic overview of the experimental and computational framework for investigating hiPSC‐CM electrophysiology with MEA systems. The MEA‐based model integrates experimental data with phenotype‐specific ionic models and tissue‐level heterogeneity.
Sofia Botti, Rolf Krause, Luca F. Pavarino   +2 more
wiley   +1 more source

Wavefront Correction of Ionospherically Propagated HF Radio Waves Using Covariance Matching Techniques [PDF]

Radioengineering, 2017
High Frequency (HF) radio waves propagating in the ionospheric random inhomogeneous media exhibit a spatial nonlinearity wavefront which may limit the performance of conventional high-resolution methods for HF sky wave radar systems.
Y. Zhu, Y Wei, P. Tong
doaj  

An integrated platform for 2‐D and 3‐D optical and electrical mapping of arrhythmias in Langendorff‐perfused rabbit hearts

The Journal of Physiology, EarlyView.
Abstract figure legend Integrated multimodal platform for panoramic cardiac mapping in isolated heart experiments. On the left, an image of the experimental setup during data acquisition showing a Langendorff‐perfused rabbit heart surrounded by three optical cameras (CAM A, B and C) positioned 120° apart, each coupled with high‐power LEDs for panoramic
Jimena Siles, Vinícius Silva, Tainan Neves, Italo Sandoval, Angélica Quadros, Giovanni Weber, Óscar Barquero, Ilija Uzelac, João Salinet   +8 more
wiley   +1 more source