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Showing 1 to 12 of 309 entries
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Experimental observation of a fundamental length scale of waves in random media.

Physical review letters

Barkhofen S, Metzger JJ, Fleischmann R, Kuhl U, Stöckmann HJ.
PMID: 24237521
Phys Rev Lett. 2013 Nov 01;111(18):183902. doi: 10.1103/PhysRevLett.111.183902. Epub 2013 Nov 01.

Waves propagating through a weakly scattering random medium show a pronounced branching of the flow accompanied by the formation of freak waves, i.e., extremely intense waves. Theory predicts that this strong fluctuation regime is accompanied by its own fundamental...

Ballistic miniband conduction in a graphene superlattice.

Science (New York, N.Y.)

Lee M, Wallbank JR, Gallagher P, Watanabe K, Taniguchi T, Fal'ko VI, Goldhaber-Gordon D.
PMID: 27708100
Science. 2016 Sep 30;353(6307):1526-1529. doi: 10.1126/science.aaf1095.

Rational design of long-period artificial lattices yields effects unavailable in simple solids. The moiré pattern in highly aligned graphene/hexagonal boron nitride (h-BN) heterostructures is a lateral superlattice with high electron mobility and an unusual electronic dispersion whose miniband edges...

Large fluctuations and singular behavior of nonequilibrium systems.

Physical review. E

Pinna D, Kent AD, Stein DL.
PMID: 26871031
Phys Rev E. 2016 Jan;93(1):012114. doi: 10.1103/PhysRevE.93.012114. Epub 2016 Jan 11.

We present a general geometrical approach to the problem of escape from a metastable state in the presence of noise. The accompanying analysis leads to a simple condition, based on the norm of the drift field, for determining whether...

Diagnostic Accuracy of Computed Tomography Scan in Detection of Upper Gastrointestinal Tract Injuries Following Caustic Ingestion.

Emergency (Tehran, Iran)

Bahrami-Motlagh H, Hadizadeh-Neisanghalb M, Peyvandi H.
PMID: 28894776
Emerg (Tehran). 2017;5(1):e61. Epub 2017 Mar 10.

INTRODUCTION: Endoscopy is an invasive procedure and finding noninvasive alternative tools in detection of probable upper gastrointestinal (GI) tract injuries following caustic ingestion is an area of interest. The present study aimed to evaluate the screening performance characteristics of...

The influence of subliminal crosstalk in dementia narratives.

Dementia (London, England)

Chatwin J, Capstick A.
PMID: 28875735
Dementia (London). 2019 Jul;18(5):1740-1750. doi: 10.1177/1471301217724922. Epub 2017 Sep 06.

No abstract available.

Therapeutic upper gastrointestinal tract endoscopy in Paediatric Gastroenterology.

World journal of gastrointestinal endoscopy

Rahman I, Patel P, Boger P, Rasheed S, Thomson M, Afzal NA.
PMID: 25789087
World J Gastrointest Endosc. 2015 Mar 16;7(3):169-82. doi: 10.4253/wjge.v7.i3.169.

Since the first report of use of endoscopy in children in the 1970s, there has seen an exponential growth in published experience and innovation in the field. In this review article we focus on modern age therapeutic endoscopy practice,...

Health promotion in a shrinking military: the call for structural integration and a conceptual systems approach.

Military medicine

Collins BS, Custis SH.
PMID: 8361596
Mil Med. 1993 Jun;158(6):386-91.

The evolution of health promotion in the military is reviewed and contrasted with developments in private sector activities. Programs in both arenas generally take a mechanistic, mortality and risk factor-based approach which targets lifestyle and behavioral change. In the...

Computation of uniform wave forms using complex rays.

Physical review. E, Statistical, nonlinear, and soft matter physics

Amodei D, Keers H, Vasco D, Johnson L.
PMID: 16605695
Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Mar;73(3):036704. doi: 10.1103/PhysRevE.73.036704. Epub 2006 Mar 08.

Complex rays and polynomial phase functions are used to numerically solve the Helmholtz equation in a realistic two-dimensional smoothly varying heterogeneous velocity model with multiple adjacent cusp caustics. Together these two methods allow the determination of global uniformly asymptotic...

Geometric optics of thermal blooming in gases. Part 1.

Applied optics

Avizonis PV, Hogge CB, Butts RR, Kenemuth JR.
PMID: 20111548
Appl Opt. 1972 Mar 01;11(3):554-64. doi: 10.1364/AO.11.000554.

Thermal blooming is considered for the cases of with and without wind transverse to the beam propagation from the point of view of fluid dynamics of a compressible gaseous system and the coupling of this with geometric optics using...

On the numerical evaluation of cuspoid diffraction catastrophes.

Journal of the Optical Society of America. A, Optics, image science, and vision

Borghi R.
PMID: 18594625
J Opt Soc Am A Opt Image Sci Vis. 2008 Jul;25(7):1682-90. doi: 10.1364/josaa.25.001682.

A simple computational approach is proposed for the evaluation of cuspoid diffraction catastrophes, which are fundamental tools for the description of wave fields in proximity to stable caustics. In particular, on representing the Pearcey and the swallowtail functions in...

Descartes glare points in scattering by icicles: color photographs and a tilted dielectric cylinder model of caustic and glare-point evolution.

Applied optics

Marston PL.
PMID: 18268747
Appl Opt. 1998 Mar 20;37(9):1551-6. doi: 10.1364/ao.37.001551.

Glare points associated with the Airy caustics of once and twice internally reflected rays are visible in the scattering by sunlit icicles. Supporting color photographs include an image of the far-field scattering. Relevant rays are analogous to the Descartes...

Caustics due to a negative refractive index in circular graphene p-n junctions.

Physical review letters

Cserti J, Pályi A, Péterfalvi C.
PMID: 18233471
Phys Rev Lett. 2007 Dec 14;99(24):246801. doi: 10.1103/PhysRevLett.99.246801. Epub 2007 Dec 11.

We show that the wave functions form caustics in circular graphene p-n junctions which in the framework of geometrical optics can be interpreted with a negative refractive index.

Showing 1 to 12 of 309 entries