Materials Literature
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The room-temperature 57 Fe Mossbauer spectra of the two iron-tellurium defect structure compounds FeTe and Fe 2 Te 3 are analysed, and shown to be superpositions of (respectively) three and four quadrupole-split pairs of lines. Each pair of lines in the total spectrum of each compound can be correlated with the differ…
The self-energy of an external moving charged particle near a surface is studied within the fast-charge approximation. For a reflecting trajectory, a formula for the complex self-energy, valid for an arbitrary dielectric function of the medium and angle of incidence, is first derived by means of a semiclassical analys…
The gap exponent for the isotropic-nematic phase transition in MBBA (N-[$p$-methoxybenzylidine]-$p$-butylaniline) has been determined from measurements of the induced birefringence in very strong magnetic fields. The experimental value, $\ensuremath{\Delta}=1.26\ifmmode\pm\else\textpm\fi{}0.10$, is consistent with the…
Abstract This paper is concerned with thermomechanics of thin shells by a direct approach based on the theory of a Cosserat surface comprising a two-dimensional surface and a single director attached to every point of the surface. In almost all previous developments of the thermo-mechanical theory of shells by direct…
High-resolution electron energy-loss spectra show unexpected features of electronic excitations in stage-1 Fe${\mathrm{Cl}}_{3}$-intercalated graphite. A sharp 1-eV plasmon surprisingly exhibits positive quadratic dispersion and damping characteristic of a free three-dimensional electron gas. However, the dispersion c…
This paper is one of those presented at the APCA Specialty Conference entitled “The User and Fabric Filtration Equipment—III”, held in October 1978 in Niagara Falls, New York. It presents guidelines for the application of vents for explosion protection in fabric filter systems. Detailed design procedures will soon be…
A pterin deaminase catalyzing the hydrolytic deamination of various pteridines was found in the bacterium, Bacillus megarerium, and partially purified from bacterial extract. The specific activity was raised 90-fold over that of the crude extract. The pH optimum is around 7.3, and the Km value for 6-carboxypterin is 1…
Abstract Über die Herstellung, Charakterisierung und Verarbeitung von Fibriden aus aromatischen Polyamiden wird berichtet. Das Haupteinsatzgebiet für diese Fibride ist die Herstellung von Elektroisolierpapieren mit hoher Dauerwärmebeständigkeit.
The longitudinal and transverse magnetostriction in EuS were measured at 1.8<T<146 K, in magnetic fields up to 130 kOe. In the paramagnetic phase (T≳Tc=16.49 K) the magnetostriction is predominantly due to the strain dependence of the exchange energy. The results are explained in terms of the theory of C…
We have measured the hyperfine magnetic fields at iron and tin in a new Heusler alloy Ru2FeSn using Mössbauer effect. The values for the hyperfine fields obtained at 80 K are 314.0 ± 1.6 and + 117.9 ± 1.5 kOe for iron and tin respectively. The field at tin is about a factor of two larger in comparison to Rh2FeSn while…
The polarized spectra of the triplet absorption in AgNa(NO 2 ) 2 have been investigated in the temperature range of -265∼70°C. The intensity of the E // b absorption decreases remarkably when the temperature is raised and approaches to T c . Above T c , it remains constant and is about 30% of the value at sufficiently…
Summary Garavellite occurs in polished sections, as small aggregates, up to 200 µ m across, of anhedral crystals, usually in direct contact with tetrahedrite, Sb-rich bismuthinite, chalcopyrite, and siderite. Chemical formula Fe 0,80 Cu 0.02 Sb 1.13 Bi 0.78 As 0.01 S 4 on the basis of S = 4, or ideally FeSbBiS 4 . The…
Abstract The results confirm the rationale which guided the experiments. The mechanical properties of the vulcanizate prepared without any milling and containing a carbon black chemically grafted to part of the elastomer are definitely superior to those of the blank, prepared under the same conditions with an ungrafte…
The theory of magnetism in heavy rare earth metals is based on the RKKY theory. In this formalism the indirect exchange interaction between the local 4f spins is mediated by the conduction electrons. When carried to second order in the 4f-conduction electron interaction, traditional pertubation theory leads to a Heise…
A model is developed for the failure time of a bundle of fibers subjected to a constant load. At any time, all surviving fibers share the bundle load equally while all failed fibers support no load. The bundle may collapse immediately or fibers may fail randomly in time, possibly more than one at a time. The failure t…
Theoretical description of the measuring method. Experimental procedure. Results: mass transfer coefficient, diffusion coefficient, temperature dependence, influence of sulphur on the dissolution of graphite. Discussion.
Abstract The composition of the soil solution of various horizons of Galician soils was studied to gain insight into the direction of the processes of weathering and neoformation by means of stability diagrams of the clay minerals. The soil solution was extracted by compression at various pF values. The most significa…
The crystal structure of the title compound, [MO(C5H7O2)3], has been determined at 295(1) K by single-crystal X-ray diffraction methods and refined by least squares to a residual of 0.040 for 2933 'observed' reflections. Crystals are monoclinic, P21/n, a 16.515(4), b 13.052(4), c 8.152(2) Å, ß 90.74(2)º, Z 4. The stru…
Critical strain annealing has been investigated for the of development of coarse grain structures in PM Astroloy. The need for this type of treatment arises because normal grain coarsening is severely retarded by carbides in the prior particle boundaries (PPBs). It was found that a strain of ∼ 2.2% produced coarse gra…
This paper is concerned with the morphology and structure-property relations in a range of duplex ferritic-martensitic (DFM) steels.It is shown that the properties depend, in a complex way, on all the parameters of the equation of mixtures viz.ferrite and martensite strengths and volume fractions.These parameters depe…