Materials Literature
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We study the covering of the plane by non-overlapping rhombus tiles, a problem well-studied only in the limiting case of dimer coverings of regular lattices. We go beyond this limit by allowing tiles to take any position and orientation on the plane, to be of irregular shape, and to possess different types of attracti…
Spectrally-resolved differential reflectivity experiments on GaMnAs over a broad spectral range (1.4-2.0 eV) are presented, representing the first such measurements in a III-Mn-V diluted magnetic semiconductor. Comparison of the measured nonlinear spectra with results in GaAs and LT-GaAs, together with calculations of…
As a new energy generator, proton exchange membrane fuel cells(PEMFCs) are expected to play a pivotal role in stationary and mobile applications due to their high power density and environmental benignancy. However, the commercialization of PEMFCs is facing many challenges, such as cost, durability and reliability.
The recently synthesized tris(μ-1,3,5,7-cyclooctatetraene)triiron, Fe 3 (C 8 H 8 ) 3, was investigated by DFT computational studies. In the gas phase, the cluster adopts C 3h symmetry and pseudo-η 3:η 5 hapticity to each of the cyclooctatetraene (COT) ligands, which exist in a π-delocalized V conformation with each li…
La dispersion des résultats concernant les oxydes magnétiques dilués rend difficile l’interprétation des observations. La présence de défauts, ponctuels ou étendus, dans les OMD ferromagnétiques semble être une caractéristique commune à de nombreux systèmes. L’étude des défauts dans les OMD est donc de première import…
The crystallographic techniques for structure determination of proteins and neucleic acids at near atomic resolution using synchrotron X-radiation has become almost automatic. However the limits of this procedure are determined by the availability of crystals. As the size and complexity of the molecular assemblies bei…
Dealloying refers to the partial, selective dissolution of the less noble component(s) of a binary or ternary alloy precursor, resulting in a noble-rich, porous structure that has high surface area. Such surface structure is beneficial for fuel cells (FC) because FC uses platinum (Pt), a scarce metal, to catalyze the…
Ce travail de magister est divisé en deux volets : Le premier volet est une contribution à l’étude de matériaux mésoporeux présentant un potentiel principalement dans le domaine de la catalyse. Nous nous sommes intéressés à la synthèse de matériaux mésoporeux du type SBA-15, contenant du cobalt ou du vanadium, via dif…
Abstract The mechanical properties of 2D honeycomb‐structured polymer sheets (HSPS) are investigated with respect to the polar angle at large deformation. The tensile force fluctuates as an undamped negative sinusoidal wave with a periodicity of 15°. The amplitude of the fluctuation is proportional to the thickness of…
Thor, god of thunder is shown as a symbol of all the alternative, environmentally friendly energy sources, some of which are shown in the background. In their Communication on page 11 162 ff., Y. Filinchuk, T. R. Jensen et al. report a highly porous form of Mg(BH4)2 that can reversibly absorb guest species and thus ac…
Liquid crystal (LC) based sensors have been investigated over the past decades in an effort to develop low cost, portable, field-deployable, highly selective chemical and biological sensors. Due to the collective behavior and the highly anisotropic properties of liquid crystal molecules, detection of very low levels (…
An optically switchable photoluminence (PL) photonic material using azobenzene-doped cholesteric liquid crystal (CLC) -dispersed quantum dots (QDs) is demonstrated in the film and capillary tube, respectively. In the film, upon the light irradiation the trans-to-cis photoisomerization of azobenzene makes the QD-disper…
Alumina-doped zinc oxide (AZO) films have wide range of applications in optical and optoelectronic devices. AZO films have advantage in high transparency, high stability to hydrogen plasma and low cost to alternative ITO film. AZO film was prepared by direct-current (DC) magnetron sputtering from ceramic ZnO:Al2O3 tar…
Atomic force microscopy and second-harmonic generation data show that boron\ndoping enhances the rate of oxidation of H-terminated silicon. Holes cause a\ngreater increase in the reactivity of the Si-H up bonds than that of the Si-Si\nback bonds.\n
Directionally reflective fiber arrays were woven with polymer fibers. Fiber cross sections produced using a tricomponent fiber extruder comprised standard circular as well as right angle retro-reflection features that run the entire length of the fiber. The fiber features are formed by an extrusion process where the p…
We propose a resonant optical Yagi-Uda nano-antenna fabricated at the end of the optical fiber probe for the sake of extracting the information of the angular directivity by absorption of directional emission as a subwavelength optical microscopy. A Yagi-Uda nano-antenna consists of a feed element surrounded by a refl…
We report on the fabrication and characterization of a micro periodic structure realized in soft-composite materials containing metallic nanoparticles. The particles are used to infiltrate a passive polymer template realized by combining a holographic curing setup and a microfluidic etching process. In other experimen…
The folding dynamics of individual structural elements in proteins is studied by a multi-probe and multi-frequency approach. In their Communication on page 10 884 ff., M. R. Bunagan, F. Gai, and co-workers achieve a significantly improved structural resolution in kinetic studies of protein folding using their approach…
An experimental investigation on a novel electrically controlled optical chopper based on holographic polymer dispersed liquid crystal (H-PDLC) gratings is presented in this paper. In order to realize the chopping function, a corresponding electrical driving source and controlling circuit are developed for the phase t…
This paper was published online on 23 August 2011 with an incorrect reference citation. Reference [12] should read as “T. J. Gay, Adv. At. Mol. Phys. 57, 157 (2009)AAMOA20065-219910.1016/S1049-250X(09)57004-8.” The reference has been corrected as of 1 September 2011. The reference is correct in the printed version of…