Results 211 to 220 of about 16,687 (260)

Guiding Crystallization around Bends and Sharp Corners

Advanced Materials, 2012
Control over the molecular orientation in organic thin films is demonstrated with precise in-plane spatial resolution over large areas. By exploiting the differential crystallization rates on substrates with different surface energies, the radial symmetry of spherulitic growth can be disrupted by preferentially selecting the molecular orientations that
Stephanie S, Lee, Samuel B, Tang, Detlef-M, Smilgies, Arthur R, Woll, Marsha A, Loth, Jeffrey M, Mativetsky, John E, Anthony, Yueh-Lin, Loo   +7 more
openaire   +2 more sources

Momentum Transport in Sharp Open-Channel Bends

Journal of Hydraulic Engineering, 2004
Flow in open-channel bends is characterized by cross-stream circulation, which redistributes the velocity and the boundary shear stress and thereby shapes the characteristic bed topography. Besides a center-region cell, classical helical motion, a weaker counterrotating outer-bank cell often exists.
Blanckaert, Koen Jacques Ferdinand, Graf, Walter H.   +1 more
openaire   +3 more sources

Diffraction of Kelvin waves at a sharp bend

Journal of Fluid Mechanics, 1968
A closed form solution is obtained for the linearized problem of the diffraction of Kelvin waves by a sharp bend on a rotating earth. It is shown that for the frequency ω of the incoming wave less than f, where ½f is the angular velocity of rotation, the wave is transmitted around the bend without change of amplitude.
Packham, B. A., Williams, W. E.
openaire   +1 more source

Design of sharp bends with transformation plasmonics

Applied Physics A, 2013
We report a design method of surface plasmon polaritons sharp bends based on transformation optics. Plas- monic waveguide bends with different angles, which pos- sess little radiation loss, are proposed. Transformation me- dia can be simply achieved with homogeneous and nonmag- netic materials, which can be constructed by altering two different ...
Yueke Wang, Dao Hua Zhang, Jun Wang, Fei Qin, Dongdong Li, Zhengji Xu   +5 more
openaire   +1 more source

Ultra-sharp bends based on hybrid plasmonic waveguides

2014 The European Conference on Optical Communication (ECOC), 2014
To explore the potentials of hybrid plasmonics, ultrasharp 90 degree bends and resonators based on silicon waveguide and hybrid plasmonic waveguides are simulated and analyzed.
Fei Lou, Lars Thylén, Lech Wosinski
openaire   +1 more source

Very sharp adiabatic bends based on an inverse design

Optics Letters, 2018
Very sharp 90°micro-bends for adiabatic optical wave propagation in multimode waveguides are demonstrated by an inverse design method, and the devices are fabricated on a silicon-on-insulator platform. The compact bending structures are based on digital waveguide metastructures with footprints as small as 2.6  μm×2.6  μm.
Yingjie Liu, Wenzhao Sun, Hucheng Xie, Nan Zhang, Ke Xu, Yong Yao, Shumin Xiao, Qinghai Song   +7 more
openaire   +2 more sources

Sharp bends with low losses in dielectric optical waveguides

Applied Optics, 1983
A new method is proposed for making sharp bends with low radiation losses in dielectric optical waveguides. By modifying the transverse refractive-index profile at curved sections both the pure bend and the transition losses can be minimized. The optimum gradient-index profile requires an inhomogeneous medium.
E G, Neumann, W, Richter
openaire   +2 more sources

Point bar deposits in narrow sharp bends

Journal of Hydraulic Research, 1996
Meandering channels typically deposit sediments near their inner bank to form point bars. Laboratory experiments with narrow sharp bends show that under identical flow conditions the configuration of point bars depends on particle size. Explanation to this grain-size effect is found in a three-dimensional particle stability. Despite favorable secondary
S. Kawai, P.Y. Julien
openaire   +1 more source