Results 41 to 50 of about 1,579,823 (328)

Optical Design of an Integrated Paschen–Runge Spectrometer by Using a Multigrating Structure

open access: yesPhotonics, 2022
An integrated direct-reading spectrometer scheme using seven concave gratings is proposed. At present, the optical design simulation has been completed, and the subsequent physical design may be carried out according to the simulation results.
Guo Xia   +5 more
doaj   +1 more source

A Step-by-step Guide to the Realisation of Advanced Optical Tweezers [PDF]

open access: yes, 2015
Since the pioneering work of Arthur Ashkin, optical tweezers have become an indispensable tool for contactless manipulation of micro- and nanoparticles.
Gigain, Sylvain   +6 more
core   +3 more sources

DELP Treatment on Vision and Retinal Microcirculation in Patients With Acute Ischemic Stroke: Report of Five Cases and Literature Review

open access: yesTherapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background The delipid extracorporeal lipoprotein filter from plasma (DELP) treatment can effectively reduce blood lipid, increase blood flow, and improve neurological deficits in patients with acute ischemic stroke (AIS). However, its effect on vision and retinal microcirculation in stroke patients has never been reported.
Ning Li   +9 more
wiley   +1 more source

MINFLUX nanoscopy enhanced with high-order vortex beams

open access: yesLight: Science & Applications
Minimal photon fluxes (MINFLUX) nanoscopy has emerged as a transformative advancement in superresolution imaging, enabling unprecedented nanoscale observations across diverse biological scenarios.
Xiao-Jie Tan, Zhiwei Huang
doaj   +1 more source

Sonet Network Design Problems

open access: yes, 2009
This paper presents a new method and a constraint-based objective function to solve two problems related to the design of optical telecommunication networks, namely the Synchronous Optical Network Ring Assignment Problem (SRAP) and the Intra-ring ...
Pelleau, Marie   +2 more
core   +4 more sources

Hybrid confinement of optical and mechanical modes in a bullseye optomechanical resonator [PDF]

open access: yes, 2016
Optomechanical cavities have proven to be an exceptional tool to explore fundamental and technological aspects of the interaction between mechanical and optical waves.
Alegre, Thiago P. Mayer   +5 more
core   +2 more sources

A Comparative Study of Cerebral Oxygenation During Exercise in Hemodialysis and Peritoneal Dialysis Patients

open access: yesTherapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Introduction Cognitive impairment and exercise intolerance are common in dialysis patients. Cerebral perfusion and oxygenation play a major role in both cognitive function and exercise execution; HD session per se aggravates cerebral ischemia in this population. This study aimed to compare cerebral oxygenation and perfusion at rest and in mild
Marieta P. Theodorakopoulou   +10 more
wiley   +1 more source

A Novel Focal Length Measurement Method for Center-Obstructed Omni-Directional Reflective Optical Systems

open access: yesApplied Sciences, 2019
An omni-directional optical system can be used as a surveillance camera owing to its wide field angle. In cases in which a system is designed with a central screen obscuring structure to increase the resolution of the off-axis field, however, the ...
Hojong Choi, Joo-Youn Jo, Jae-Myung Ryu
doaj   +1 more source

Underwater hyperspectral imaging system for deep-sea exploration

open access: yesFrontiers in Physics, 2022
As a technology that combines spectral technology and imaging technology, hyperspectral imaging technology can obtain the spectral and spatial information about the targets effectively.
Qingsheng Xue   +3 more
doaj   +1 more source

Optical Design of the SuMIRe PFS Spectrograph

open access: yes, 2014
The SuMIRe Prime Focus Spectrograph (PFS), developed for the 8-m class SUBARU telescope, will consist of four identical spectrographs, each receiving 600 fibers from a 2394 fiber robotic positioner at the telescope prime focus. Each spectrograph includes
Barkhouser, Robert   +3 more
core   +1 more source

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