Results 11 to 20 of about 6,348 (198)

Deciphering the performance of different surface models for corneal topography. [PDF]

Ophthalmic Physiol Opt
Abstract Purpose To study the performance of different corneal surface models to be used for ray tracing. Models based on geometric surfaces and polynomial fits were compared and the differences discussed. Methods For this simulation study, five characteristic generic surface configurations were generated: (A) perfect biconic, (B) decentred biconic ...
Langenbucher A, Szentmáry N, Cayless A, Hoffmann P, Wendelstein J.   +4 more
europepmc   +2 more sources

Structural Cerebral Correlates of Perplexity: Exploring a Linguistic Marker in Cognitive Aging. [PDF]

Psych J
ABSTRACT Language changes are among the earliest indicators of cognitive decline in aging. Perplexity, a linguistic measure derived from information theory that quantifies speech predictability, has emerged as a potential marker for detecting early cognitive changes. However, its underlying neural substrates remain unclear.
Wang X, Herold CJ, Frankenberg C, Ablimit A, Schultz T, Kong L, Schröder J.   +6 more
europepmc   +2 more sources

Uncertainty quantification in three‐dimensional magnetohydrodynamic equilibrium reconstruction via surrogate‐assisted Bayesian inference

Contributions to Plasma Physics, Volume 63, Issue 5-6, June-July 2023., 2023
Abstract In three‐dimensional (3D) equilibrium, reconstruction defining parameters of an ideal magneto‐hydrodynamic equilibrium are inferred from a set of plasma diagnostic measurements. For the reconstructed parameters, various forms of uncertainty estimates exist within common 3D reconstruction frameworks.
Robert Köberl, Udo von Toussaint, Hans‐Joachim Bungartz, Jonathan Schilling, Christopher G. Albert, W7‐X Team   +5 more
wiley   +1 more source

Translation model for anterior segment tomographic data to corneal spherical aberration derived from a Monte‐Carlo simulation based on raytracing

Acta Ophthalmologica, Volume 100, Issue 8, Page e1665-e1674, December 2022., 2022
Abstract Background Intraocular lenses with a negative aspherical design for correction of corneal spherical aberration (SA) have gained popularity in recent decades. In most cases, a ‘one size fits all’ concept is followed, where all eyes receive lenses with the same SA correction. The purpose of this study is to develop a strategy based on raytracing
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Lena Münninghoff, Rosalie Wortmann, Jascha Wendelstein, Peter Hoffmann   +6 more
wiley   +1 more source

Prediction of CW chord as a measure for the eye’s orientation axis after cataract surgery from preoperative IOLMaster 700 measurement data

Acta Ophthalmologica, Volume 100, Issue 6, Page e1232-e1239, September 2022., 2022
Abstract Background The angles alpha and kappa are widely discussed for centring refractive procedures, but they cannot be determined with ophthalmic instruments. The purpose of this study is to investigate the Chang‐Waring chord (position of the Purkinje reflex PI relative to the corneal centre) derived from an optical biometer before and after ...
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Johannes Weisensee, Jascha Wendelstein, Peter Hoffmann   +5 more
wiley   +1 more source

Implementation and validation of guiding centre approximation into ERO2.0

Contributions to Plasma Physics, Volume 62, Issue 5-6, June‐July 2022., 2022
Abstract The Monte‐Carlo code ERO2.0 uses full orbit resolution to follow impurity particles throughout the plasma volume to determine the local erosion and deposition fluxes on the plasma‐facing components of fusion devices in magnetic confinement fusion.
Sebastian Rode, Juri Romazanov, Dirk Reiser, Sebastijan Brezinsek, Christian Linsmeier, Alexander Pukhov   +5 more
wiley   +1 more source

Covalently Cross‐Linked Pig Gastric Mucin Hydrogels Prepared by Radical‐Based Chain‐Growth and Thiol‐ene Mechanisms

Macromolecular Bioscience, Volume 22, Issue 4, April 2022., 2022
This study introduces acrylate‐ and allyl‐ether‐modified pig gastric mucin for the preparation of chemically cross‐linked hydrogels through free‐radical polymerization and thiol‐ene coupling with thiol‐modified hyaluronic acid, respectively. The data show that these hydrogels are cytocompatible and exhibit an adaptable stiffness in the range of soft ...
Jessica S. Brand, Leonard Forster, Thomas Böck, Philipp Stahlhut, Jörg Teßmar, Jürgen Groll, Krystyna Albrecht   +6 more
wiley   +1 more source

Heterogeneous design and mechanical analysis of HELIAS 5‐B helium‐cooled pebble bed breeding blanket concept

International Journal of Energy Research, Volume 46, Issue 3, Page 2748-2770, 10 March 2022., 2022
Summary One of the most challenging objectives of the European research concerning nuclear fusion technology, promoted by the EUROfusion consortium, is to bring stellarator‐type nuclear fusion devices to maturity. To this purpose, studies on a large HELIcal‐axis advanced stellarator (HELIAS), extrapolated from Wendelstein 7‐X and based on a 5‐fold ...
Gaetano Bongiovì, Giovanni Marra, Rocco Mozzillo, Andrea Tarallo   +3 more
wiley   +1 more source

How well can today's tooth‐colored dental restorative materials reproduce the autofluorescence of human teeth? – Ambition and reality!

Journal of Esthetic and Restorative Dentistry, Volume 33, Issue 5, Page 720-738, July 2021., 2021
Abstract Objectives The autofluorescence of dental hard tissues has been known for over 100 years. Thus, manufacturers add fluorophores to dental restorative materials to improve the esthetic properties of these materials. So far, there has been no study evaluating the ability of these fluorophores to reproduce the autofluorescence of dental hard ...
Christian Klein, Thomas Connert, Christiane von Ohle, Christian Meller   +3 more
wiley   +1 more source

Sphingolipid long‐chain base hydroxylation influences plant growth and callose deposition in Physcomitrium patens

New Phytologist, Volume 231, Issue 1, Page 297-314, July 2021., 2021
Summary Sphingolipids are enriched in microdomains in the plant plasma membrane (PM). Hydroxyl groups in the characteristic long‐chain base (LCB) moiety might be essential for the interaction between sphingolipids and sterols during microdomain formation.
Jasmin Gömann, Cornelia Herrfurth, Agnieszka Zienkiewicz, Till Ischebeck, Tegan M. Haslam, Ellen Hornung, Ivo Feussner   +6 more
wiley   +1 more source