Materials Literature
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Field method, also called geometrical vector flux field method, is a well established technique to design concentrators and in general nonimaging optical systems. The method is based on building reflective concentrators with the geometry of field lines, these concentrators do not disturb the flux field and become idea…
Lately the short-wave infrared (SWIR) has become very important due to the recent appearance on the market of the small detectors with a large focal plane array. Military applications for SWIR cameras include handheld and airborne systems with long range detection requirements, but where volume and weight restrictions…
Tailoring allows designing a freeform optical surface which precisely produces a desired irradiance distribution on a desired target from a known small source by solving a partial differential equation. Existence and uniqueness of the solution depends on the boundary conditions. We present two alternative types of bou…
Micro-optical systems, that utilize multiple channels for imaging instead of a single one, are frequently discussed for ultra-compact applications such as digital cameras. The strategy of their fabrication differs due to different concepts of image formation. Illustrated by recently implemented systems for multi-apert…
A series of novel linear aromatic ether ketone polymers containing triazole units were synthesized by click chemistry and their structures and properties were characterized by FT-IR, $^1H$ NMR, GPC, TGA, DSC and WAXD. The results showed that these polymers exhibited relatively small molecular weights distributions, go…
A new anion receptor utilizing carbamate functionality as hydrogen bonding site has been designed and synthesized. This new receptor 2 has two amide hydrogens and two carbamate hydrogens anchored at 1,8-position of anthracene. These four hydrogens form a concave structure for the anions and the receptor 2 was found to…
CuO/Cu electrodes comprising a surface layer of a densely packed array of unusual cog-shaped CuO microparticles with hierarchical nanofilament-based superstructures are presented by Stephen Mann and co-workers on page 3516. The electrodes demonstrate an improvement in coulombic efficiency, specific capacity, and cycli…
In this work a vectorized and parallel version of the Finite-Difference Time-Domain method (FDTD) is applied to Volume Holographic Gratings (VHG) and Thin-Film Filters (TFF). In particular, in this work gratings with a grating period vector forming an arbitrary angle with the perpendicular to the plane of incidence ar…
E-mail: sanggi@ewha.ac.kr (S.-g. Lee), cmlee@ewha.ac.kr (C. Lee)Received July 6, 2011, Accepted July 27, 2011Key Words : Oxygen reduction, Palladium, Electrocatalyst, Ionic CNT, Fuel cellIonic liquids (ILs) have attracted an increasing amount ofinterest, owing to their high thermal and chemical stabilitywith considera…
The special features of the weldability of high-strength low-carbon microalloyed steels are investigated.
The real aberration properties (all orders) and correction abilities of optical aspherical surfaces of arbitrary shape are insufficiently investigated due to the lack of exact aberration theory. Here we derive and investigate an exact analytical distortion function for axis-symmetric aspherical surfaces of arbitrary s…
"Despite its maturity, the powder metallurgy (PM) fabrication process continues to rely heavily on indirect methods to determine and predict the quality of its compacts early in the manufacturing line. Currently, the most comprehensive testing is performed on sintered parts, resulting in higher cost and increased wast…
A new occurrence of rankamaite is here described at the Urubu pegmatite, Itinga municipality, Minas Gerais, Brazil. The mineral forms cream-white botryoidal aggregates of acicular to fibrous crystals, intimately associated with simpsonite, thoreaulite, cassiterite, quartz, elbaite, albite, and muscovite. The average o…
In a recent letter (Chatterjee et al 2011 J. Stat. Mech. L05001 ) it was claimed that a four-state predator–prey (4SPP) model exhibits critical behavior distinct from that of directed percolation (DP). In this letter, we show that the 4SPP in fact belongs to the DP universality class.
Monodispersed porous NiO and $Co_3O_4$ microcapsules with a hollow core were synthesized using SBA-16 silica sol and PS as a hard template. The porous hollow microcapsules were characterized by XRD, TEM and $N_2$ adsorption/desorption analysis. After $H_2$ reduction of metal oxide microspheres, they were conducted as…
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The inhibition of phosphatases by adenosine 5'-phosphorothioate (AMPS) was first reported in the late 1960s; however, the structural basis for the inhibition has remained unknown. Here, it is shown that AMPS is a submicromolar inhibitor of class C acid phosphatases, a group of bacterial outer membrane enzymes belongin…
This study focuses on the maximal use of industrial waste from burning coal, i.e. fly ash and bottom ash, in making hollow concrete bricks (HCB). Fly ash (FA) and bottom ash (BA) obtained from East Java, Indonesia, is incorporated to partly replace the use of Portland cement and natural sand. The purposes of the study…
Under pressure and temperature conditions like those found in deep geological repositories (DGRs), rare-earth cations may react with silicates to form rare-earth disilicates. This study establishes the stability range of yttrium disilicates in response to changes in pH. The α, β, γ, and δ polymorphs of Y 2 Si 2 O 7 we…
E-mail: shjin@pusan.ac.krReceived July 17, 2011, Accepted July 29, 2011Key Words : Alkyne, Coupling reaction, Dendrimer, Sonogashira reactionDendrimers, which are prepared by repetition of a givenset of reactions using either divergent or convergent strate-gies, are highly branched and regular macromolecules withwell-…