Results 61 to 70 of about 1,465,298 (295)

Gravitational Lenses With More Than Four Images: I. Classification of Caustics

, 2000
We study the problem of gravitational lensing by an isothermal elliptical density galaxy in the presence of a tidal perturbation. When the perturbation is fairly strong and oriented near the galaxy's minor axis, the lens can produce image configurations ...
Charles R. Keeton, Erdl H., Hans J. Witt, Hogg D. W., Jackson N., Kochanek C. S., Kormann R., Nair S., Shude Mao, Witt H. J.   +9 more
core   +1 more source

Exploiting Two‐Photon Lithography, Deposition, and Processing to Realize Complex 3D Magnetic Nanostructures

Advanced Functional Materials, EarlyView.
Two‐photon lithography (TPL) enables 3D magnetic nanostructures with unmatched freedom in geometry and material choice. Advances in voxel control, deposition, and functionalization open pathways to artificial spin ices, racetracks, microrobots, and a number of additional technological applications.
Joseph Askey, Arjen van den Berg, Sandra Ruiz Gomez, Claire Donnelly, Dirk Grundler, Sam Ladak   +5 more
wiley   +1 more source

Simulating Hard Rigid Bodies

, 2009
Several physical systems in condensed matter have been modeled approximating their constituent particles as hard objects. The hard spheres model has been indeed one of the cornerstones of the computational and theoretical description in condensed matter.
Alder, Allen, Allen, Allen, Allen, Allen, Andersen, Blaak, C. De Michele, Corezzi, Corezzi, Cruz, de Gennes, de la Pena, De Michele, De Michele, De Michele, De Michele, Donev, Donev, Donev, Donev, Donev, Eberly, Ericson, Foffi, Foffi, Frenkel, Frenkel, Frenkel, Go, Goldstein, Gray, Hansen, Het, Jiao, Jiao, Kolafa, Landau, Lee, Lubachevsky, Onsager, Parsons, Perram, Press, Pusey, Rapaport, Rimon, Samborski, Scala, Sciortino, Talbot, Taylor, Tijpto-Margo, van Zon, Veerman, Vieillard-Baron, Vroege, Weeks, Whittaker, Wu   +60 more
core   +1 more source

Cryogenic Focused Ion Beam Milling to Investigate the Anisotropic Magnetotransport Properties of Bismuth Microcrystals

Advanced Functional Materials, EarlyView.
The highly anisotropic Fermi surface of bismuth results in variations in magnetotransport properties across different crystallographic directions, which can be characterized by studying microcrystals. To avoid the observed surface melting under room temperature Focused Ion Beam (FIB) irradiation, two low‐temperature FIB fabrication methods are proposed
Amaia Sáenz‐Hernández, Soraya Sangiao, Claudia Felser, Chandra Shekhar, José Ángel Pardo, Alfonso Ibarra, José María De Teresa   +6 more
wiley   +1 more source

Funnel Libraries for Real-Time Robust Feedback Motion Planning

, 2017
We consider the problem of generating motion plans for a robot that are guaranteed to succeed despite uncertainty in the environment, parametric model uncertainty, and disturbances.
Majumdar, Anirudha, Tedrake, Russ
core   +1 more source

Improved Bounds and Containing Ellipsoids in Karmarkar's Linear Programming Algorithm [PDF]

Mathematics of Operations Research, 1988
Karmarkar's projective algorithm for linear programming provides not only primal solutions but dual solutions giving bounds on the optimal value. Here we show how improved bounds can be obtained at the expense of solving a two-dimensional linear programming problem at every iteration, and also how an ellipsoid containing all dual optimal solutions can
openaire   +1 more source

Extended Ellipsoidal Outer‐Bounding Set‐Membership Estimation for Nonlinear Discrete‐Time Systems with Unknown‐but‐Bounded Disturbances [PDF]

Discrete Dynamics in Nature and Society, 2016
This paper develops an extended ellipsoidal outer‐bounding set‐membership estimation (EEOB‐SME) algorithm with high accuracy and efficiency for nonlinear discrete‐time systems under unknown‐but‐bounded (UBB) disturbances. The EEOB‐SME linearizes the first‐order terms about the current state estimations and bounds the linearization errors by ellipsoids ...
Yushuang Liu, Yan Zhao, Falin Wu
openaire   +3 more sources

Microsphere Autolithography—A Scalable Approach for Arbitrary Patterning of Dielectric Spheres

Advanced Functional Materials, EarlyView.
MicroSphere Autolithography (µSAL) enables scalable fabrication of patchy particles with customizable surface motifs. Focusing light through dielectric microspheres creates well defined, tunable patches via a conformal poly(dopamine) photoresist. Nearly arbitrary surface patterns can be achieved, with the resolution set by the index contrast between ...
Elliott D. Kunkel, Alec G. Burnett, Katherine E. Scheiber, Hans D. Robinson   +3 more
wiley   +1 more source

Lower and upper bounds for chord power integrals of ellipsoids [PDF]

Applied Mathematical Sciences, 2014
First we discuss dierent representations of chord power integrals Ip(K) of any order p 0 for convex bodies K R d with inner points. Second we derive closed-term expressions of Ip(E(a)) for an ellipsoid E(a) with semi-axes a = (a1;:::;ad) in terms of the support function of E(a) and prove upper and lower bounds expressed by the volume and the mean ...
openaire   +3 more sources

Precursor Mineral Phases of Forming Mollusk Shell Nacre: A Study of Hydrated Samples

Advanced Functional Materials, EarlyView.
Mineral, organic phase, and water are the essential components in mollusk shell nacre formation. Their interplay is not well understood, because the hydrated material is difficult to observe at high resolution, under close to native conditions. Forming nacre is studied using environmental and cryo‐electron microscopy and hydrated ACC phases, together ...
Anna Kozell, Xiao‐Meng Sui, Neta Varsano, Stephen Weiner, Lia Addadi   +4 more
wiley   +1 more source