Results 51 to 60 of about 504,859 (272)
Advanced Engineering Materials, Volume 27, Issue 9, May 2025.This study explores the use of laser‐induced forward transfer in the picosecond regime to create in vitro biomodels. Focusing on hydrodynamics and rheology, it investigates jet dynamics through time‐resolved imaging, optimizing laser fluence, biological ink viscosity, and printing distance to precisely control the volume and location of bioink ...
Lucas Duvert +5 more
wiley +1 more source
Stroke saturation on a MEMS deformable mirror for woofer-tweeter adaptive optics
, 2009 High-contrast imaging of extrasolar planet candidates around a main-sequence star has recently been realized from the ground using current adaptive optics (AO) systems. Advancing such observations will be a task for the Gemini Planet Imager, an upcoming "
Bruce Macintosh +30 more
core +1 more source
Advanced Engineering Materials, EarlyView.When realized as inserts in high‐pressure die casting, aluminum cooling channels for electric powertrain components and similar applications typically require a stabilizing filler to survive the process. The present study investigates relinquishing this filler using additively manufactured inserts promising performance improvements.
Dirk Lehmhus +9 more
wiley +1 more source
The Holographic Dispersed Fringe Sensors (HDFS): phasing the Giant Magellan Telescope [PDF]
arXiv, 2022 The next generation of Giant Segmented Mirror Telescopes (GSMT) will have large gaps between the segments either caused by the shadow of the mechanical structure of the secondary mirror (E-ELT and TMT) or intrinsically by design (GMT). These gaps are large enough to fragment the aperture into independent segments that are separated by more than the ...
arxiv
Casimir Forces in a Piston Geometry at Zero and Finite Temperatures [PDF]
Phys.Rev.D76:045016,2007, 2007 We study Casimir forces on the partition in a closed box (piston) with perfect metallic boundary conditions. Related closed geometries have generated interest as candidates for a repulsive force. By using an optical path expansion we solve exactly the case of a piston with a rectangular cross section, and find that the force always attracts the ...
arxiv +1 more source
Warm-started wavefront reconstruction for adaptive optics [PDF]
, 2008 Future extreme adaptive optics (ExAO) systems have been suggested with up to 10^5 sensors and actuators. We analyze the computational speed of iterative reconstruction algorithms for such large systems. We compare a total of 15 different scalable methods,
Lall, Sanjay +3 more
core +1 more source
Multifunction reflector controlled by liquid piston for optical switch and beam steering
Optics Express, 2019 This paper presents a multifunction reflector controlled by liquid piston for optical switch and beam steering. The multifunction reflector consists of two liquid cavities that are designed with microchannels. Two holes covered with elastic membranes are fabricated on the upper surface of the liquid cavities.
Chao Liu +3 more
openaire +3 more sources
Direct Ink Writing of Conductive Hydrogels
Advanced Functional Materials, EarlyView.This review examines the use of direct ink writing (DIW) for fabricating conductive hydrogels with customizable 3D structures. It outlines the rheological requirements for successful DIW, followed by an exploration of the materials and ink formulations used to impart electronic and/or ionic conductivity to hydrogels while maintaining printability ...
Monica Ho +6 more
wiley +1 more source
Parasitic Interference in Long Baseline Optical Interferometry: Requirements for Hot Jupiter-like Planet Detection [PDF]
The Astrophysical Journal 706, 2 (2009) 1299-1308, 2010 The observable quantities in optical interferometry, which are the modulus and the phase of the complex visibility, may be corrupted by parasitic fringes superimposed on the genuine fringe pattern. These fringes are due to an interference phenomenon occurring from straylight effects inside an interferometric instrument.
arxiv +1 more source
Initial Design of an Optical-Access Piston Expansion Chamber for Wet-Expansion
Energy Procedia, 2017 Abstract High efficiency expanders which can cope with fluid-vapour mixtures (i.e wet expansion) at the inlet and during expansion have the potential to increase the power output from thermodynamic power cycles. Volumetric expanders are considered suitable, yet experimental results are scarce and there is no model that can predict the performance of ...
Lecompte, Steven +2 more
openaire +2 more sources