Results 21 to 30 of about 452,681 (253)

Visible core spectroscopy at Wendelstein 7-X

Review of Scientific Instruments
This paper presents an overview of recent hardware extensions and data analysis developments to the Wendelstein 7-X visible core spectroscopy systems. These include upgrades to prepare the in-vessel components for long-pulse operation, nine additional spectrometers, a new line of sight array for passive spectroscopy, and a coherence imaging charge ...
W7-X Team, Ford, O. P., Langenberg, A., Romba, T., Pölöskei, P., Zanini, M., Bannmann, S., Gonda, T., Ida, K., Lopez Cansino, R., Pablant, N., De La Riva Villen, J., Swee, C., Yoshinuma, M., Alonso, A., Geiger, B., Perseo, V., Viezzer, E.   +17 more
openaire   +6 more sources

Predictive Correction Model for Corneal Back Surface Astigmatism With IOLMaster700 Keratometry Data in a Cataractous Population. [PDF]

Clin Exp Ophthalmol
ABSTRACT Background To develop and validate various models to predict total keratometry (TK) power vector components TKC0 and TKC45 from classical keratometry (K) KC0 and KC45 based on a large dataset of pre cataract surgery IOLMaster 700 measurements.
Langenbucher A, Hoffmann P, Cayless A, Szentmáry N, Riaz K, Gatinel D, Findl O, Pantanelli S, Yeo TK, Savini G, Wendelstein J.   +10 more
europepmc   +2 more sources

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

First experimental observation of zonal flows in the optimized stellarator Wendelstein 7-X

Physical Review Research
In this work, we present the first experimental evidence of the presence of zonal flow (ZF) structures in the optimized stellarator Wendelstein 7-X.
D. Carralero, T. Estrada, J. M. García-Regaña, E. Sánchez, T. Windisch, A. Alonso, E. Maragkoudakis, C. Brandt, K. J. Brunner, C. Gallego-Castillo, P. Kornejew, K. Parks, K. Rahbarnia, H. Thienpondt   +13 more
doaj   +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