Materials Literature
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Hematitas de nove solos e uma de itabirito foram tratadas com NaOH 5 mol L-1 e analisadas por difratometria de raios X (DRX), usando varredura escalonada (0,02°2θ/20 s). Determinaram-se o espaçamento d e as dimensões a0 e c0 da cela unitária. As amostras foram dissolvidas com ditionito-citrato-bicarbonato de sódio (DC…
/spl gamma/-radiation-induced absorption in the visible spectral region is studied in H/sub 2/-loaded and untreated optical fibers with high-OH low-Cl KU core and low-OH low-Cl KS-4V core. H/sub 2/-loading is found to suppress the low-dosage transient absorption band centered at 670 nm in KS-4V fibers. After irradiati…
Plates of high strength, low alloy (HSLA) steel (JIS‐G‐3115 SPV‐50Q) were found to be susceptible to sulfide stress cracking and hydrogen‐induced cracking (HIC) in wet H 2 S . The diffusion coefficient for the hydrogen atom in the SPV‐50Q steel was determined at 25–60°C and the activation energy for diffusion was 24.7…
Potassium (K) fixation plays a significant role in the soil‐plant system influencing the effectiveness of fertilizaiton. Among the factors controlling fixation capacity of soils, clay mineralogy and soil moisture are of primary importance. The objective of this experiment was to study the K fixation capacity of differ…
Abstract Thermoplastic sandwich composite systems offer great potential for future automotive applications. High specific bending stiffness, good insulation properties, high specific energy absorption and impact resistance can be achieved by the use of fabric reinforced sheets as sandwich faces and thermoplastic foam…
We develop an approach to the statistical description of a system of interacting particles in order to describe spatially inhomogeneous structures. A criterion is proposed for selecting system states whose contributions in the partition function are dominant. A nonperturbative calculation of the partition function is…
We present magnetic-, resistivity-, and specific-heat measurements of the title compounds and found that in Eu0.7Sr0.3MnO3 an insulator-metal transition can be induced by an external field below 60 K while Eu0.7Ca0.3MnO3 remains insulating. EuMnO3 exhibits two magnetic transitions at 35 and 47 K which are associated w…
The molecular dynamics computer simulation technique was used to evaluate the early stages of Li ion migration occurring at the electrolyte/cathode interface applicable to solid‐state oxide thin film batteries. A crystal was oriented such that its (001) planes were parallel to the lithium metasilicate glass surface, a…
The effect of temperature on the electrochemical synthesis of poly(o-anisidine) (POA) thin films has been investigated. The POA films were synthesized electrochemically under cyclic voltammetric conditions in aqueous solutions of H2SO4 at various temperatures between -6°C and 40°C. These films were characterized by cy…
It has been shown previously that laminated ceramic structures of layers (or fibres) separated by crack deflecting structures give a simple, easy, and general method of enhancing the properties of ceramics, as determined in both the laboratory and under service conditions, particularly in environments of extreme therm…
A review is presented of recent insights on the role of transmutation in the development of radiation-induced changes in dimension or radiation-induced changes in physical or mechanical properties. It is shown that, in some materials and some neutron spectra, transmutation can significantly affect or even dominate a g…
On the basis of the relation T(σ,H) derived within the framework of the Bean–Rodbell model a semiquantitative analysis of (B,T) magnetic phase diagrams in the hexagonal region of the MnFeP1−xAsx (0.15⩽x⩽0.66) series of compounds was carried out. It was found that the first order transition line in the (B,T) plane is t…
Siderite, calcite and goethite occur in a Low Moor Peat near Freising, southern Germany. Siderite is present mainly as microcrystalline ovoids which have a lamellar structure and are less than 5 μm long. Selected area electron diffraction and X‐ray diffraction data suggest a crystal size less than that of the ovoids,…
Two recently synthesized derivatives of porphycene, 2,7,12,17-tetramethyl-3,6-13,16-dibenzo[ cde, mno ]porphycene and 2,7,12,17-tetra- tert -butyl-3,6-13,16-dibenzo[ cde, mno ]porphycene, were studied by stationary and time-resolved spectroscopy and quantum chemical calculations. Both compounds were found to be nonlum…
To meet the demand for permanent magnet materials usable up to 450–500 °C, we investigated and reported that a SmTM magnet with a low temperature coefficient of coercivity and a moderately high coercivity has substantially lower irreversible losses at elevated temperatures than conventional Sm2TM17 magnets. We have co…
To obtain water-soluble oligodepsipeptide with pendant thiol groups, the alternating co-oligomer [oligo(Glc-alt-Cys)], consisting of glycolic acid (Glc) and L-cysteine (Cys) residues as α-hydroxy acid and α-amino acid residues, respectively, was prepared by means of ring-opening homo-oligomerization of cyclo[Glc-Cys(M…
New diphenylfluorene-based aromatic polyazomethines were synthesized via polycondensation of aromatic diamines with aromatic dialdehydes. The highest inherent viscosity of polyazomethines was obtained for solution polycondensation in m-cresol at room temperature under reduced pressure. The aromatic polyazomethines hav…
A series of n-type ZnO alloys doped with Ga and ZnS were prepared by mechanical alloying. Densities of 95% to 98% of theoretical density were achieved by hot pressing the milled powders at 1000 and 1200 °C, respectively. The electrical resistivity and Seebeck coefficient of alloys containing 0.25–3.0 at. % Ga were cha…
Boralsilite, the first natural anhydrous Al-B-silicate, is a high-temperature phase in pegmatites cutting granulite-facies metapelitic rocks at Larsemami Hills, Prydz Bay, east Antarctica (type locality) and Almgjotheii in the contact aureole of the Rogaland Intrusive Complex, southwestern Norway. Stable assemblages…
Micromagnetic finite element calculations clearly show that the magnetizability of nanocomposite Nd2Fe14B magnets improves with increasing α-Fe content. The magnetization curves show a steep increase at the domain propagation field in dc demagnetized samples. Thermally demagnetized states store a higher amount of exch…