Materials Literature
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The oxygen permation fluxes through (BICUVOX.10) ceramics were measured as functions of oxygen chemical potential gradient and temperature, in the 823-923 K range. The influence of the deposition of a composite on one or both surfaces of the membranes was evaluated. Due to the small oxygen exchange coefficient on the…
This paper reports on measurement of the temperature dependences of the following transport coefficients: electrical conductivity in the σ 11 cleavage plane, the Seebeck coefficients S 11 and S 33 (axis 3 is along the trigonal crystal axis), the Hall coefficients R 123 and R 321 , and the Nernst-Ettingshausen constant…
Abstract For the first time, Raman and IR studies were performed on new double tungstates Li 2 M II (WO 4 ) 2 (M = Co, Ni and Cu) crystallizing in the wolframite‐type structure. The observed vibrational modes were assigned to the respective motions of atoms in the unit cell. The vibrational properties of the Cu deriva…
Bismuth subcitrate is a known nephrotoxic agent that may lead to acute oliguric renal failure when ingested in toxic doses. We report a 17-year-old girl who was admitted to the emergency room with complaints of nausea, vomiting, and anuria. She had taken 25 tablets containing 300 mg bismuth subcitrate (total 7.5 g). T…
A theoretical study is made of the structure of magnetic inhomogeneities and the spectrum of spin waves in antiferromagnets with a magnetoelectric effect. It has been established that the interaction of the inhomogeneous magnetic momentum M with the sufficiently strong magnetic field H along the "easy" axis leads to t…
Results are reported of an experimental investigation of penetration rate and penetrant concentration profile, in the PMMA−methyl alcohol (MA) system. Penetration of liquid MA, at 22, 30, and 40 °C, along annealed or quenched films sandwiched between glass plates, was followed microscopically, and the corresponding co…
The influence of the temperature of liquid aluminum alloy, the dipping time in liquid alloy and the thickness of base strips on the solidified layer was studied during the process of producing aluminum alloy composite strips used in automobile radiator with inversion casting. It is concluded that there is welding as w…
Colored crystals of the middle term (a = 1) of the Bi2−aRaGeO5 series (R = Y (yellow), Yb (brown)) have been grown. The structure of these materials has been established by single-crystal X-ray diffraction. They are isostructural and crystallize in the orthorhombic system, space group Pbca (No. 61), Z = 8, with unit-c…
Improved patency in vein grafts harvested with surroungding tissue: results of a randomized study using three harvesting techniques.
When restoring abandoned pastures on acidic hill-land soils to productivity, it is important to bring soil Ca and Mg to adequate levels. Gypsum is a readily available Ca amendment that is sufficiently soluble to move rapidly into the soil when surface-applied. Gypsum has been shown to reduce detrimental effects of sub…
The electrical conductivity of water used in papermaking tends to increase over time due to water conservation efforts. This study concerns the effect of changes in conductivity on the amounts of highly charged cationic polymers required to neutralize the surfaces, as measured with a fiber-pad streaming potential meth…
The addition of a coupling agent to silica-rubber compounds enhances the filler-matrix compatibility. Under certain mixing conditions the surface of the filler may be only partly activated, which may have an adverse effect on the properties in the final product. A mixing temperature of at least 130°C is necessary to e…
Preparation and characterization of sodium-graphite intercalation compounds were investigated. It was confirmed that the resulting compound (NaC x ) had the stage 8 structure with identity period of 2.8 nm. The Raman spectroscopy showed that the G-band signal of NaC x was observed at 1582 cm −1 and at 1608 cm −1 , whi…
It has been shown that the main process, which determines the hysteresis inversion frequency, at which the electrooptical V-shape switching is always observed, is just a specific voltage distribution between the aligning (or/and insulating) layer and the liquid crystal layer. The voltage divider is almost completely d…
We have prepared and studied by vibrational and electronic spectrometry of a series of ferrophthalocyanine complexes with phosphine or phosphite axial ligands [PMe3, P(OMe)3, PPh3, P(OPh)3, PPh(OMe)3 and POH(OEt)2]. With PMe3, P(OMe)3 as ligands, only hexacoordinated complexes are obtained but with PPh3, P(OPh)3 and P…
A series of supramolecular side-chain liquid crystalline polyurethanes (SCLCPUs) was prepared by utilizing the selective hydrogen bonding interaction between polyurethane containing pyridine moieties (1) and 4-dodecyloxybenzoic acid (2). Hydrogen bonding was confirmed by FTIR spectroscopy and supported by medium high…
The effects of compositional variation, nucleation catalyst and thermal treatment on the nature, type and stability field of crystallizing phases and microstructure formed in CaO and/or MgO aluminosilicate glasses are described using differential thermal analysis (DTA), X-ray powder diffractometry (XRD) and scanning e…
In order to investigate the effects of helium on the microstructural evolution in Fe–Cr–Mn (W, V) alloy during three irradiation modes of electron beam, electron/He+-ion dual-beam and electron irradiation after helium pre-injection, in situ observations were carried out using a high voltage electron microscope connect…
Older solid dielectric cables are now approaching the end of their life and failing. Consequently there has been a sustained effort for the development of techniques to assess the remaining life of in-service cables for the purpose of establishing replacement criteria. Because of the generally accepted belief that the…
Relation between tensile deformation behavior and microstructure in variously aged Ti–49.7 at%Ni–1.3 at%Co shape memory alloys has been investigated. Stress-strain curves for the alloys aged at 623 K and 723 K for 1.8 ks were of a work-hardening type, but those for the alloys aged at the two temperatures over 28.8 ks…