W-Band Pancharatnam Half Wave Plate Based on Negative Refractive Index Metamaterials

Electromagnetic metamaterials, made from arrangements of subwavelength sized structures, can be used to manipulate radiation. Designing metamaterials that have a positive refractive index along one axis and a negative refractive index along the orthogonal axis can result in birefringences, $\Delta n>1$. The effect can be used to create wave plates with subwavelength thicknesses. Previous attempts at making wave plates in this way have resulted in very narrow usable bandwidths. In this paper, we use the Pancharatnam method to increase the usable bandwidth. A combination of Finite Element Method and Transmission Line models were used to optimise the final design. Experimental results are compared to the modelled data.Comment: 7 pages, 10 figures. Accepted on 2014-02-18 for publication in Applied Optics. This paper is made available as an electronic reprint with the permission of OS

The impacts of network relationships on SMEs' internationalization process.

In today's globalization era, more and more firms are striving to have an international presence, even though they face many challenges. Based on a multisite case study method, this article examines how indigenous Malaysian small and medium-sized enterprises (SMEs) use their network relationships to facilitate their internationalization process. The evidence from the case of three software firms and one control firm in this study support the firms' internationalisation process in the ways that network relationships trigger and motivate them to internationalize, influence their market-selection decision and mode-of-entry decision, help them gain initial credibility, allow access to additional relationships and established channels, help in lowering cost and reducing risk, and influence their internationalization pace and pattern

Mixing Within Patterned Vortex Core

The video shows the flow dynamics within inner and outer regions of a vortex core. The observed phenomena mimic a transport process occurring within the Antarctic vortex. The video shows two distinct regions: a strongly mixed core and broad ring of weakly mixed region extending out the vortex core boundaries. The two regions are separated by a thin layer that isolates the weakly and strongly mixed regions; this thin layer behaves as barrier to the mixing of the two regions. The video shows that the barriers deplete when a swirl of the vortex core increases and the vortex core espouses a triangular pattern.Comment: 62nd Annual Meeting of the APS Division of Fluid Dynamics, Fluid Dynamics Vide

3-Benzyl-8-meth­oxy-2-sulfanyl­idene-1,2,3,4-tetra­hydro­quinazolin-4-one

The tetra­hydro­quinazole fused-ring system of the title compound, C16H14N2O2S, is roughly planar (r.m.s. deviation = 0.039 Å); the phenyl ring of the benzyl substituent is aligned at 78.1 (1)° with respect to the mean plane of the fused-ring system. In the crystal, two mol­ecules are linked by a pair of N—H⋯S hydrogen bonds about a center of inversion, generating a dimer

N-[2,4-Dioxo-3-aza­tricyclo­[7.3.1.05,13]trideca-1(13),5,7,9,11-pentaen-3-yl]thio­urea

In the two independent mol­ecules in the asymmetric unit of the title compound, C13H9N3O2S, the aza­tricyclo­trideca­penta­ene ring system is approximately planar with r.m.s. deviations of 0.022 and 0.033 Å. The urea unit connected to the fused rings is approximately perpendicular [dihedral angles = 82.4 (1) and 82.7 (1)°]. In the crystal, the mol­ecules associate by N—H⋯O hydrogen bonds, forming a chain running along the a axis. The crystal studied was a non-merohedral twin with a fractional contribution of 49.6 (1)% for the minor domain

3-(Prop-2-en-1-yl)-2-sulfanyl­idene-1,2,3,4-tetra­hydro­quinazolin-4-one

The tetra­hydro­quinazoline fused-ring system of the title compound, C11H10N2OS, is approximately planar (r.m.s. deviation = 0.019 Å). In the crystal, adjacent mol­ecules are linked by N—H⋯O hydrogen bonds, forming a chain running along the b axis

5-Chloro-2-methyl­sulfonyl-1,2,4-triazolo[1,5-a]quinazoline

The triazoloquinazole fused-ring system of the title compound, C10H7ClN4O2S, is essentially planar (r.m.s. deviation = 0.009 Å). In the methyl­sulfonyl substituent, the two S—O bonds are of equal length [1.402 (2) Å]. In the crystal, adjacent mol­ecules inter­act weakly through Cl⋯N contacts [ca 3.197 (2) Å]