Materials Literature
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Microstructure‐level residual stresses occur in polycrystalline ceramics during processing, as a result of thermal expansion anisotropy and crystallographic misorientation across the grain boundaries. Depending on the grain size, the magnitude of these stresses can be sufficiently high to cause spontaneous microcracki…
We demonstrate electrical electron spin injection via interband tunneling in ferromagnetic/nonmagnetic semiconductor Esaki diodes. An interband tunnel junction between ferromagnetic p + -(Ga,Mn)As and nonmagnetic n + -GaAs under reverse-bias allows spin-polarized tunneling of electrons from the valence band of (Ga, Mn…
We used local thermal analysis and ellipsometry to measure the glass transition temperatures (Tg) of supported thin films of poly(4-hydroxystyrene) (PHS) and hydroxy terminated polystyrene (PS-OH). The films were spuncast from solution onto silicon oxide substrates and annealed under vacuum at elevated temperatures to…
The interplay between side-chain and main-chain conformations is a distinctive characteristic of proline residues. Here we report the results of a statistical analysis of proline conformations using a large protein database. In particular, we found that proline residues with the preceding peptide bond in the cis state…
The first layer SERS effect is usually ascribed to dynamical charge transfer (DCT) between metal and absorbate, following a model by Persson. Experiments show that there is no first layer SERS effect at smooth noble metal surfaces, in spite of the surface resistance caused by adsorbates, which is also caused by DCT ac…
The fluorescence of single-colloidal CdSe quantum dots is investigated at room temperature by means of the autocorrelation function over a time scale of almost 12 orders of magnitude. Over a short time scale, the autocorrelation function shows complete antibunching, indicating single-photon emission and atomiclike beh…
A new, versatile preparation method for porous filmsby spin-coating with a stable suspension of pre-synthesized microscopic zeolite particles (see Figure) is reported by the authors. The scope of the method includes zeolite/substrate combinations inaccessible by direct growth, and preferred orientation of porous mater…
Si 3 N 4 powders with the concurrent addition of Yb 2 O 3 and MgSiN 2 were sintered at 1900°C for 2–48 h under 0.9 MPa nitrogen pressure. Microstructure, lattice oxygen content, and thermal conductivity of the sintered specimens were evaluated and compared with Si 3 N 4 , Yb 2 O 3 , and MgO addition. MgSiN 2 addition…
The crevice corrosion resistance of Alloy 625 (UNS N06625) and Alloy 22 (UNS N06022) was compared based on critical potentials for stabilization and repassivation as well as crevice stabilization rates derived from critical potential data. The effects of temperature and anion composition in 5 M lithium chloride (LiCl)…
The fundamental electromagnetic properties of left-handed materials (LHMs) are reviewed and verified by finite-element method full-wave analysis using rectangular waveguide structures loaded by a LHM and adopting an effective medium approach. The negative phase velocity, positive intrinsic impedance, and modified boun…
The ferric uptake regulator (Fur) protein is known to act as a Fe2+-dependent transcriptional repressor of bacterial promoters. Here, we show that, in Helicobacter pylori, Fur can mediate the regulation of iron-activated genes in contrast to classical Fur regulation, in which iron acts as a co-repressor. Inactivation…
The Eu(III) tetraazamacrocyclic complexes [Eu.1] and [Eu.2], and the Tb(III) and Yb(III) complexes [Tb.1] and [Yb.2], have been synthesized as luminescent molecular-level devices. The Eu complexes exhibit unique dual pH switching behavior in water under ambient conditions. The delayed Eu emission is reversibly switche…
Abstract This study was conducted to clarify the influences of the lining properties of skirts upon comfort and movement. The comfort of lining fabrics and real skirts with and without lining was rated by sensory tests on the basis of sensorial comfort on the skin and body movement. Actual body movements were investig…
Sulphation of mortars and concretes is a function of diverse environmental factors (SO2 aerosol, temperature, etc) as well as some material characteristics. One of the phases that could be formed as consequence of the sulphation of the hydraulic binder is thaumasite. In this paper different hydraulic mortars have been…
Swelling can be defined as the volume increase experienced by any solid body when wetted. Many lithotypes (carbonate rocks, sandstones, igneous rocks) have expansive components in their composition; anhydrite and clay minerals are the two best-known expansive components in stone materials. Swelling strain can be easil…
Measurement techniques of reinforcement corrosion are scarcely researched if compared with the increasing number of publications in the subject. However, numerous possibilities and challenges remain without being explored. In present paper mention is made to some of the present possibilities of electrochemical techniq…
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This work discusses the results from accelerated tests intended to investigate the ways the different curing methods affect the carbonation of calcium aluminate cements pastes (CAC). The research was focused on the mineralogical composition of hydrated and carbonated samples. The compressive strengths and the porosity…
The aluminosilicate melt is a partly ordered phase and is the origin of glass for producing glassceramics and petrurgical materials. They are well extended used as construction materials for pavings and coatings. Its structure can be described in the terms of the aluminosilica tetrahedras coordination so-called Q spec…
Actually, the inertization, recovery and valorisation of the wastes coming from municipal and industrial processes are the most important goals from the environmental and economical point of view. An alternative technology capable to overcome the problem of the dishomogeneity of the raw material chemical composition i…