Materials Literature
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Lining to walls 18mm thick over 300mm wide 2.77 0.39 6.68 3.17 m2 9.85 not exceeding 300mm wide – 0.25 4.28 0.95 m 5.23 holes for pipes and the like – 0.04 0.69 – nr 0.69 Material £ hours £ £ rate £ K11 RIGID SHEET FLOORING/SHEATHING/ LININGS/CASINGS – cont Fire-retardant chipboard/mdf; Class 1 spread of flame Lining t…
The ferroelectric polarization of triangular-lattice antiferromagnets induced by helical spin-spiral order is not explained by any existing model of magnetic-order-driven ferroelectricity. We resolve this problem by developing a general theory for the ferroelectric polarization induced by spin-spiral order and then by…
Topological insulator is composed of an insulating bulk state and time reversal symmetry protected two-dimensional surface states. One of the characteristics of the surface states is the locking between electron momentum and spin orientation. Here, we report a novel in-plane anisotropic magnetoresistance in topologica…
This thesis deals with possible ways of improving sensitivity and repeatability of determination of cadmium by EcHG - ETAAS. The main complication of this coupled method is condensation of water vapors in the transport capillary, which takes part in the losses of the volatile form of cadmium. Possible solution or at l…
Acid-base and coordination properties of macrocyclic ligand 1-oxa-4,7- diazacyclononane-4,7-bis(methylenephosphonic acid) were investigated. Protonation constants and stability constants with Ca2+ , Mg2+ , Cu2+ , Zn2+ , Mn2+ a Ga3+ metal ions were determined by potentiometry. Keywords Potentiometry, coordination chemi…
International audience
ISBN 978-83-926523-4-2
ISBN 978-83-926523-4-2
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…