Results 331 to 340 of about 82,170 (356)

The wavefront and delta -wavefront algorithms: a comparative study

[1991 Proceedings] Tenth Annual International Phoenix Conference on Computers and Communications, 2002
The author studies and compares, using rigorous analytical models, the performances of two algorithms, wavefront and delta -wavefront, suitable for processing an important class of recursive queries, the partially-instantiated transitive closure ones. Such a study reveals, among other findings, that the performance of these algorithms individually as ...
openaire   +2 more sources

Diverse terahertz wavefront manipulations empowered by the spatially interleaved metasurfaces

Science China Information Sciences, 2023
Jitao Li, Zhen Yue, Jie Li, Chenglong Zheng, Silei Wang, Mengyao Li, Yating Zhang, Yan Zhang, Jianquan Yao   +8 more
semanticscholar   +1 more source

Polarization-Independent Silicon Metadevices for Efficient Optical Wavefront Control.

Nano letters (Print), 2015
We experimentally demonstrate a functional silicon metadevice at telecom wavelengths that can efficiently control the wavefront of optical beams by imprinting a spatially varying transmittance phase independent of the polarization of the incident beam ...
K. Chong, I. Staude, Anthony James, J. Dominguez, Sheng Liu, S. Campione, G. Subramania, T. Luk, M. Decker, D. Neshev, I. Brener, Y. Kivshar   +11 more
semanticscholar   +1 more source

The wavefront revolution

Journal of Cataract and Refractive Surgery, 2021
Geunyoung Yoon, Scott MacRae
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A fast wavefront reconstructor for the nonlinear curvature wavefront sensor

Adaptive Optics Systems VI, 2018
The Nonlinear Curvature Wavefront Sensor (nlCWFS), first proposed by Guyon, determines wavefront shape from images of a reference beacon in a number of planes between the pupil and focal plane of a telescope. We describe a new algorithm that rapidly recovers the low-order aberrations accurately enough to allow practical use of the nlCWFS in an adaptive
Johanan L. Codona, Michael Hart, Mala Mateen   +2 more
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Wavefront reconstruction using smartphone based wavefront sensors

SPIE Proceedings, 2015
Smartphone camera system has the capability of being integrated into powerful field-sensing tools, capturing data and sharing these data with computing servers or cloud experts. The purpose of this work is to implement a wavefront sensor based on the smartphone platform, which has many potential applications in thin-films and bio-related sensing areas.
Zhenyu Yang, Qiwen Zhan
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Dissatisfaction After Trifocal IOL Implantation and Its Improvement by Selective Wavefront-Guided LASIK.

Journal of refractive surgery, 2019
PURPOSE To evaluate a substantially improved wavefront acquisition technique (Peramis; SCHWIND eye-tech-solutions, Kleinostheim, Germany) for selective wavefront-guided aberration correction to improve satisfaction after implantation of trifocal ...
T. Seiler, Aharon Wegner, Tim Senfft, T. Seiler   +3 more
semanticscholar   +1 more source

Effect of Activation Wavefront on Electrogram Characteristics During Ventricular Tachycardia Ablation.

Circulation: Arrhythmia and Electrophysiology, 2019
Background Catheter ablation of ventricular tachycardia (VT) in structural heart disease is challenging because of noninducibility or hemodynamic compromise. Ablation often depends on elimination of local abnormal ventricular activities (LAVAs) but which
Claire A. Martin, Ruairidh Martin, Philippe Maury, Christian Meyer, Tom Wong, Corentin Dallet, Rui Shi, P. Gajendragadkar, M. Takigawa, A. Frontera, G. Cheniti, N. Thompson, T. Kitamura, Konstantinos Vlachos, Michael Wolf, Felix Bourier, A. Lam, J. Duchâteau, G. Massoullié, T. Pambrun, A. Denis, N. Derval, R. Dubois, M. Hocini, Michael Haïssaguerre, P. Jaïs, F. Sacher   +26 more
semanticscholar   +1 more source

Nonparametric narrowband wavefront estimation from wavefront gradients

IEEE Transactions on Signal Processing, 1999
The wavefield sampled by a two-dimensional (2-D) planar array can he characterized by a delayed signal. This correspondence investigates the problem of the nonparametric estimation of the delay function (or wavefront) when the waveform is narrowband. The wavefront is estimated by integrating the local estimates of the differential time of delay (TOD ...
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Iterative wavefront tailoring to simplify freeform optical design for prescribed irradiance.

Optics Letters, 2019
The direct formulation of a freeform optical surface for producing a prescribed irradiance from a point source is very complicated. Instead of directly determining the freeform optical surfaces, we derive a general equation of a parameterized outgoing ...
Zexin Feng, D. Cheng, Yongtian Wang
semanticscholar   +1 more source