Materials Literature
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A method of interpreting radial distribution functions (RDF) of amorphous metals is proposed in which the role of the local atomic structure is emphasized. It is found that the width and height of the peaks of the RDF are related to the second moment of the atomic-level hydrostatic stress distribution $〈{p}^{2}〉$. The…
We propose a fitting formula for the dielectric screening function of the degenerate electron liquids at metallic and lower densities which accurately reproduces the recent Monte Carlo results as well as those of the microscopic calculations and which satisfies the self-consistency conditions in the compressibility su…
The dielectric strength (i.e. breakdown voltage U c of a 2 mm gap) of pure SF 6 and its relaxation properties at p=100 kPa were measured for T=500-1800K. Two temperature regions with approximately constant values of U c T were found.
A model is presented describing how an organic solid transforms between a neutral and an ionic ground state. Whereas for a one-dimensional stack this transition is expected to be first order, the Coulomb interactions between stacks can cause the phase transition to occur over a broad temperature range by stabilizing a…
Surface optical phonons on the (100) face of strontium titanate have been observed by high-resolution EELS. Good agreement is found between experimental spectra and predictions based on a semi-classical theory, using the known dielectric function of strontium titanate.
The authors report resistivity measurements along the high-conductivity axis of (TMTSF) 2 ClO 4 , (TMTSF) 2 TaF 6 and (TMTSF) 2 SbF 6 for various hydrostatic pressures up to 12.5 kbar, and for transverse magnetic fields of up to 50 kG, in the temperature range 100 mK-4K. These measurements show that all three compound…
The physics, chemistry, and possible applications of the storage of hydrogen in intermetallic reservoirs are discussed. Storage in the form of intermetallic hydrides can be safe and, where hydrogen has some special value as a fuel, economical. New pumps and refrigerators based on the heat of sorption of the hydrogen i…
The Brillouin scattering spectra of NaNO2 have been observed as a function of temperature near the two phase transition points ; normal (paraelectric)-incomensurate (antiferroelectric) and incommensurate-comensurate (ferroelectric) phase transition points. A simple temperature dependence of the Brillouin frequency shi…
From the point of view of molecular interations, an attempt has been made to classify tetrahedral molecular crstals qualitatively by using experimental data of crystal structures, the Debye characteristic temperature at O K, θD(O), assuming 6N degrees of vibrational freedom, and the transition or melting tempreratures.
The distribution of 239Pu formed in uranium dioxide during irradiation is nonuniform and changes with burnup. This implicates a burnup effect on the fuel temperature distribution.The total 239Pu concentration during irradiation and its radial distribution at end-of-life has been calculated in low-enriched UO2 fuel pel…
In the Finslerian deformation theory of ferromagnetic substances, each point (x) is endowed with the unit vector ( y) called the spin and the line-element (x,y) is taken as the independent variable. The length of y is normalized at each point, so that the direction of y alone is noticed. This is the so-called spin dir…
The Type Ck 35 steel was electrochemically charged with hydrogen. For this purpose, the testing material was electrodeposited by cadmium. Acoustic emission analyses were correlated with the conditions of hydrogen charging and the analytically measured hydrogen content. A correlation between the signals of acoustic emi…
A new highly sensitive photoconductor in a near-infrared wavelength region with a low dark decay has been developed for an electrophotographic device. The photoconductor has been created with a multilayered Se-As-Te chalcogenide glass. The structure of the photoconductive layer consists of four parts: (a) Se-rich bloc…
(1981). A preliminary model for growth of Ceratophyllum demersum L. SIL Proceedings, 1922-2010: Vol. 21, No. 3, pp. 1484-1491.
Abstract Physical and mechanical properties of poly(ε‐caprolactam) synthesized in presence of various amounts of lithium chloride are measured on compression moulded films and correlated to the molecular organization, both in the amorphous and in the crystalline regions. By increasing the amount of LiCl present in the…
Abstract Ba 2 HgS 3 (leuchtend rot) kristallisiert nach Einkristalldaten und Guinier‐Simon‐Daten orthorhombisch mit a = 8,93 1 , b = 4,35 7 , c = 17,25 7 Å, Z = 4, Raumgruppe Pnma—D . Parameter siehe Text. Nach der Strukturaufklärung (Diffraktometerdaten, 976 hkl, MoKα, R = 6,4 5 %, R W = 8.9 6 %) liegen eckenverknüpf…
Abstract Tunnelling recombination luminescence in CsI :Na crystals is studied by means of linear polarization, magnetic circular polarization, and optical detection of ESR either under or after X‐ray irradiation. Results are well interpreted in terms of a self‐trapped exciton (STE) scheme as the final emitting state o…
Tensile residual stresses induced by welding are an important factor in intergranular stress corrosion cracking (IGSCC) of Type 304 stainless steel pipes. Modified welding procedures can be used to prevent IGSCC by producing compressive residual stresses at potential crack initiation sites. This paper analyzes two pro…
Abstract. New data on the planktonic diatoms from the Gulf of Naples are presented together with those from the literature. Information is given on abundances, seasonal cycles and distributions of 183 taxa, including species, varieties and forms.
The crystal structure of the electron acceptor 2,5-difluoro-7,7,8,8-tetracyano-p-quinodimethane, 2,5-TCNQF2, has been determined by single-crystal X-ray diffraction methods. The layered crystal structure is dominated by the antiparallel coupling of cyano bond moments of symmetry-related molecules. The molecular and el…