Materials Literature
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The structure, electrical, and magnetic properties of epitaxial LaCa(Sr)MnO single crystal films with a clustered structure have been studied. In films with a “metallic” phase content C m 0 ≤0.15, the electric conductivity is determined by the spin-dependent tunneling of charge carriers between “ metallic” clusters, a…
Dielectric response of (0–3) type composites, made of BaTiO 3 particles with mean size of 20–30 nm and polyvinylidene fluoride was found to be determined by the response of BaTiO 3 with a broad Curie point anomaly at TC ≈ 317 K. The dielectric anomaly appears in the same temperature range where the decrease in the wav…
The temperature dependencies (from 295 K to melting temperatures) of optical activity for the KDP group crystals (KH 2(1−x) D2x PO4, NH 4 H 2 PO 4 , RbH 2 PO 4 , and CsH 2(1−x) D 2x AsO 4 ) for wavelengths λ = 633 nm are measured. The experimental technique related to the HAUP is used. Insignificant influence of deute…
For the shortly discovered formula type M 2 Te 5 O 13 (triclinic, P1̄), the establishment of an isostructural series in the last third of the lanthanide family (M = Dy - Lu) was possible. The excessive formula unit TeO 2 additional to the well-known composition M 2 Te 4 O 11 (monoclinic, C2/c) leads to the slicing of…
The electrical resistivity of TlInTe 2 chain-structure semiconductors in directions parallel and perpendicular to the chains is analyzed as a function of temperature. It is demonstrated that, in both cases, the temperature dependences of the electrical resistivity in the temperature range under investigation are chara…
We present a physically-based method to enforce contact angles at the intersection of fluid free surfaces and solid objects, allowing us to simulate a variety of small-scale fluid phenomena including water drops on surfaces. The heart of this technique is a virtual surface method, which modifies the level set distance…
The process of edge flaking of brittle materials is a significant limitation in design, handling and use of components. Simple quasistatic tests to identify resistance to edge flaking can be based on near-edge indentation and scratching towards an edge, and these produce rankings of materials that broadly correlate wi…
Abstract A conjugated copolymer having an alternate structure of 9,10-diphenylanthracene and 1,3-diphenylallene was synthesized by the Suzuki–Miyaura cross-coupling reaction with 9,10-dibororanylanthracene and 1,3-bis(4-bromophenyl)-1,3-diphenylallene. The diphenylanthracene moiety worked as an absorptive and emissive…
The French research on spent fuel long term evolution has been performed by CEA (Commissariat a l'Energie Atomique) since 1999 in the PRECCI project with the support of EDF (Electricite de France). These studies focused on the spent fuel behaviour under various conditions encountered in dry storage or in deep geologic…
Nanocomposites are a new class of polymer systems. Modified layered silicates as fillers are dispersed at a nm-level within a polymer matrix. For nanocomposites new and extraordinary properties are observed. The thermal stability and the flame retardancy of polymers forming nanocomposites are improved. The flame retar…
A nematic liquid crystal in contact with a grating surface possessing an alternating stripe pattern of locally homeotropic and planar anchoring is studied within the Frank-Oseen model. The combination of both chemical and geometrical surface pattern leads to rich phase diagrams, involving a homeotropic, a planar, and…
Evidence for deformation mechanism crossover, i.e. from dislocation nucleation and motion to grain boundary mediated plasticity, has been sought for many years, but direct experimental confirmation remains elusive. By employing in situ dynamics dark field transmission electron microscope investigation on nanocrystalli…
Three variations on a classroom demonstration of the encapsulation of droplets and evidence for release of the interior solution are described. The first two demonstrations mimic biocompatible applications of encapsulation. Reversible formation of capsules from aqueous solutions of sodium alginate, a negatively charge…
Abstract The sequence of differentiation of the epidermis of scutes during embryogenesis in the tortoise Testudo hermanni was studied using autoradiography, electron microscopy and immunocytochemistry. The study was mainly conducted on the epidermis of the carapace, plastron and nail. Epidermal differentiation resembl…
Abstract The diametral expansion and elongation rates of Zr-2.5Nb pressure tubes in CANDU™ (CANada Deuterium Uranium) nuclear reactors are important properties that limit their useful life and the maximum power level for reactor operation. For a given set of operating conditions there is considerable variability in th…
A series of thermotropic liquid crystalline polyphosphates, containing photochromic molecules of stilbene in the backbone and substituted azobenzene in the side chain, were synthesized respectively. The inherent viscosity measurements were determined for all the polymers. The stability and char yield, Tg, Tm and Ti we…
A method to automatically create low order state-space models for magnetic devices is set forth. The method begins with geometrical and materials data from which the finite element analysis (FEA) is used to build a high order state-space model. It is shown that this model contains far more state variables than are nec…
The electronic structures of D(4h)-M(2)(O(2)CH)(4) and the oxalate-bridged complexes D(2h)-[(HCO(2))(3)M(2)](2)(mu-O(2)CCO(2)) and D(4h)-[(HCO(2))(2)M(2)](4)(mu-O(2)CCO(2))(4) have been investigated by a symmetry analysis of their MM and oxalate-based frontier orbitals, as well as by electronic structure calculations…
Molten salt synthesis (MSS) of ceramics is an alternative to sol-gel and ceramic methods. Phase purity, as well as particle shape and size, may be effectively controlled by MSS. In the present study, magnetoelectric Aurivillius phase Bi5Ti3FeO15 is obtained by MSS. Experimental setting for reaction control is describe…
Frage der Orientierung: Bei der Selbstorganisation eines frei rotierenden Dialkinyl-verbrückten Zink(pyridylporphyrin)-Dimers entsteht bevorzugt das cyclische Tetramer, in dem das orthogonale Konformer (⊥) vorliegt, und nicht das üblichere planare Konformer ( // , siehe Bild). Der Grund für dieses Verhalten ist wahrsc…