Spatially-variant photonic crystals (SVPCs), in which the orientation of the unit cell changes as a function of position, are shown to be capable of abruptly controlling light beams using just low index materials and can be made to have high polarization selectivity. Multi-photon direct laser writing in the photo-polymer SU-8 was used to fabricate three-dimensional SVPCs that direct the flow of...

Polarization dependence of bend loss caused by the polymer coating layer for a standard singlemode fiber (SMF28) is investigated theoretically and experimentally. Bend loss for SMF28 for both the TE and TM mode is calculated separately. Normalized polarization dependent loss is proposed for the characterization of the polarization sensitivity of bend loss for different bend radii. Corresponding...

A numerical study has been done through an Al2O3–water in a double lid-driven  square  cavity with various  inclination  angles  and discrete heat sources. The top and right moving walls are at low temperature. Half of  the  left and bottom walls are  insulated and  the  temperatures of the other half are kept at high. A large number of simulations for a wide  range  of Richardson  number ...

Deprem sonrası can damarı sistemlerinde oluşan hasarlara bağlı ortaya çıkan maddi ve manevi kayıplar toplumun yaşam kalitesini olumsuz etkileyen önemli durumlardan biri olarak bilinir. kaynaklı fay hareketleri gömülü boru hatları için tehlikelerden biridir. Bu çalışmada, yumuşak kil zeminde basınçlı basınçsız çelik hattının doğrusal olmayan sayısal modellenmesi yapılmaktadır. amaç doğrultusunda...

This article presents the research results that aim to develop promising mesh turbomachines equipped with jet control systems. The operating in difficult conditions oil and gas production are mainly considered. At same time, some can be used other branches, including power engineering transport. Three-dimensional models for computer simulation of net turbines systems were developed. Prototypes ...

In this paper we describe ways to transform a curve constituted by a series of data points delivered by monitoring devices into a series of bends and lines between them. The resulting qualitative representation of the curve can easily be utilized in a Knowledge Based System. Since the representation obtained resembles the way humans describe curves, e.g. "this bend is not sharp enough to be nor...

The frequency of appearance and curvature of zigzag shaped single-walled carbon nanotubes (SWNTs) are tailored by adjusting the gas flow rate, and changing the gas flow direction with respect to the step-edges on a single-crystal quartz substrate. The electrical resistance of SWNTs is found to increase with the number of bends. The resistance in SWNT segments with sharp curvature is observed to...

Traumatic injuries to the primary dentition are quite common. When primary teeth are subjected to trauma, force transmission and/or invasion of the underlying tooth germs lying in close proximity can result in a variety of disturbances in the permanent successors. Few of these disturbances include hypoplasia, dilaceration, or alteration in the eruption sequence and pattern. Dilaceration is defi...

We theoretically investigate under what conditions the director field in a spindle-shaped nematic droplet or tactoid obtains a twisted, parity-broken structure. By minimizing the sum of the bulk elastic and surface energies, we show that a twisted director field is stable if the twist and bend elastic constants are small enough compared to the splay elastic constant, but only if the droplet vol...