Results 61 to 70 of about 93,016 (319)

Alignment, Rising, Sticking, and Phototaxis: Modulating the Behavior of Hematite Micropeanuts

Advanced Materials Interfaces, EarlyView.
Although a rich variety of behaviors, such as rising and phototaxis, are observed with light‐activated semiconductor microparticles, the experimental conditions under which such behaviors occur have not been elucidated. In this study, pH, fuel concentration, and light intensity are varied, revealing diverse behaviors of hematite microparticles.
David P. Rivas, Zameer Hussain Shah, Henry Shum, Sambeeta Das   +3 more
wiley   +1 more source

Formation and growth of multiple, distinct ice lenses in frost heave

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 47, Issue 1, Page 82-105, January 2023., 2023
Abstract This paper presents a fully coupled thermo‐hydro‐mechanical (THM) model which simulates frost heave in fully saturated soils. The model is able to simulate the formation and growth of multiple distinct ice lenses. The basic equations of the system were derived using the continuum theory of mixtures, nonequilibrium thermodynamics, and fracture ...
Hao Gao, Seyed Ali Ghoreishian Amiri, Signe Kjelstrup, Gustav Grimstad, Benoit Loranger, Elena Scibilia   +5 more
wiley   +1 more source

Auto-detection of strong gravitational lenses using convolutional neural networks

Emergent Scientist, 2018
We propose a method for the automated detection of strong galaxy-galaxy gravitational lenses in images, utilising a convolutional neural network (CNN) trained on 210 000 simulated galaxy-galaxy lens and non-lens images.
Pearson James, Pennock Clara, Robinson Tom   +2 more
doaj   +1 more source

Effective Manipulation of Water Droplets on Open Superhydrophobic Glass Surfaces by Using a Triboelectrically Charged Polytetrafluoroethylene Rod on the Back Side of These Surfaces

Advanced Materials Interfaces, EarlyView.
The movement of pure water droplets on a superhydrophobic glass surface is precisely controlled through electrostatic manipulation using a polytetrafluoroethylene (PTFE) rod from the opposite side. With just a few seconds of triboelectric charging, the PTFE rod directs droplets, achieving acceleration over 10 000 mm s−2.
Wei Chen Huang, Ming Yen Chang, Jiann Shieh, Chun Hung Lin, Chin Chi Hsu   +4 more
wiley   +1 more source

Variability of gravitational lens images, caused by variability of gravitational field of lens: binary systems and loops of cosmic strings

Вісник Астрономічної школи, 2003
Gravitational lenses with changeable mass distribution cause characteristic changes of image brightness. Detection and analyze of such changes allow us to clarify the nature of the lens. This effect gives a possibility to obtain such dynamical objects as
I. S. Masniak, B. I. Hnatyk, V. I. Zhdanov   +2 more
doaj   +1 more source

Large-scale Structure and the Determination of $H_{\rm o}$ from Gravitational Lens Time Delays [PDF]

Astrophys.J. 464 (1996) 54-59, 1995
We analyse the effects of large-scale inhomogeneities upon the observables of a gravitational lens system, focusing on the issue of whether large-scale structure imperils the program to determine the Hubble parameter through measurements of time delays between multiple images in lens systems. We find that the lens equation in a spatially flat Robertson-
arxiv   +1 more source

Roll‐to‐Roll (R2R) Processing of Large‐Area Flexible Piezoresistive Films with Magnetically Z‐Aligned Nickel Microcolumnar Morphology

Advanced Materials Technologies, EarlyView.
Development of processing window for the continuous manufacturing of flexible and anisotropic piezoresistive films using magnetic‐field assisted alignment of Ni particles on a roll‐to‐roll processing line. Abstract Flexible pressure sensors are highly sought after for applications like rehabilitation healthcare, advanced wearable electronics ...
Nagarpita Moka Vidyanag, Jeffery Dahl, Jaewon Yoon, Mukerrem Cakmak   +3 more
wiley   +1 more source

Additive Manufacturing of Stretchable Zipping Electrostatic Actuators through Spray Encapsulation of a Frozen Liquid

Advanced Materials Technologies, EarlyView.
This work presents a method to print multi‐layer elastomer structures containing liquid cavities, where the fluid is incorporated as part of the printing process by freezing it, thus avoiding the conventional final filling step. We demonstrate this process by fabricating and characterizing dense arrays of zipping electrostatic actuators.
Giulio Grasso, Samuel Rosset, Herbert Shea   +2 more
wiley   +1 more source

Images for a Binary Gravitational Lens from a Single Real Algebraic Equation [PDF]

Astron.Astrophys. 390 (2002) L11, 2002
It is shown that the lens equation for a binary gravitational lens being a set of two coupled real fifth-order algebraic equations (equivalent to a single complex equation of the same order) can be reduced to a single real fifth-order algebraic equation, which provides a much simpler way to study lensing by binary objects.
arxiv   +1 more source

The quadrupole gravitational lens

The Astrophysical Journal, 1987
An asymmetric lens made of a spherically symmetric galaxy and a quadrupole tidal part allows a very simple pictorial examination of the multiplicity and positions of the images, for any mass density profile. The lens equations can be reduced to one equation in one variable.
openaire   +2 more sources