Materials Literature
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abundance and water vapor partial pressure on refractivity have been combined into a simplified equation for the refractivity of air, and estimates have been made of uncertainties in calculated refractivity. Under ambient conditions typical of metrology laboratories, the agreement between the simplified equation and E…
It is found theoretically and experimentally that a linear relationship between capacitance and reciprocal voltage of a nematic liquid crystal cell of homogeneous alignment. From this slope, the ratio of elastic constants K33/K11 can be acculatly obtained.
The general features of the a-c impedance at a metal-electrolyte interface as a function of frequency are depicted, and recently developed measurement techniques are described. It is established that at low and very low frequencies, down to the millihertz domain, relaxation phenomena are found in those cases where the…
This paper concludes a study of the three Laves phase compounds YbFe 2, NdFe2 and PrFe2. The properties of NdFe 2 have been thoroughly investigated with a number of techniques including X-ray diffraction, magnetization measurements, 143Nd N.M.R., 57Fe Mössbauer effect and neutron diffraction. Some data is also reporte…
The influence of partial substitutions of iron in TiFe by some other 3-d transition metals on the hydrogenation characteristics of the corresponding ternary (pseudo-binary) TiFexM1−x(M=Cr, Mn, Co, Ni; 0.5≲x≲1) compounds was systematically investigated. Such substitutions result in two main effects:(i) stabilization of…
Thermal analysis is a group of techniques in which a physical property of a substance is measured as a function of temperature while the substance is subjected to a controlled temperature program. The output of thermal analysis represents data predominantly in the form of curves characteristic for a particular chemica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in binuclear copper(II) complexes with only a single hydroxo bridge: the x-ray structure of .mu.-hydroxo-tetrakis(2,2'-bipyridine)dicopper(II) perchlorateMuin S. Haddad, Scott R. Wilson, Derek J. Hodgson, and David N. HendricksonCite this: J. A…
Magnetic properties of the hysteresis loop of magnetostrictive amorphous ferromagnetic alloys are predominantly determined by the magnetoelastic coupling energy between the spontaneous magnetization and internal stresses. Domain structures as well as the pinning of domain walls are governed by long-range and short-ran…
The initiation and propagation of cracks during both quenching and deformation in polycrystalline Cu–Al–Ni alloys have been investigated under various conditions. The results obtained are summarized as follows; (1) Quenching-cracks may be avoided by choosing the temperature of quenching media close to or below the Ms…
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Abstract The objective of this study was to compare extractabilities of Al from Al‐treated peats using KCl, CuCl 2 , and HCl to the total Al content determined after dry ashing. Results showed that Al extracted by CuCl 2 or HCl correlated well with the total amount of Al present in the system. On the other hand, 1 N K…
A review is given of electron paramagnetic resonance (EPR) research of substitutional defects in ABO3 double oxides crystallizing in the perovskite structure. In section 2, the valency and lattice sites are considered. In section 3, the existence of transition metal-oxygen vacancy pairs, Me-Vo, is reviewed, and in 4,…
The absorption spectra of paramagnetic transition metal porphyrins consist of (ππ*), charge-transfer and tripmultiplet transitions. The tripmultiplet states result from interaction between the metal d-orbitals and the porphyrin (ππ*) excited triplet states. For CuIITPP, luminescence occurs from the lowest energy tripq…
Preface. Introduction. Methods. Probability Concepts. Probability Distributions for Describing Failures. Data Manipulation Concepts. Failure Data. Reliability of Simple Systems. Reliability and Availability of Systems with Repair. Fault Tree Analysis. Event Tree Analysis. Computer Programs for Fault Tree Analysis. Nuc…
A technique involving rapid scratching of rotating disk electrodes under potential control is presented and used to examine rapid reaction steps in the anodic behavior of iron in aqueous solutions of p H 0–14. Both anodic and cathodic reaction rates are greatly accelerated during scratching; current densities of up to…
In polypeptide liquid crystals deuterium NMR spectra of labeled guest molecules and labeled Polybenzylglutamate exhibit a characteristic doubling (anisochronism) of the quadrupolar splittings of enantiotopic deuterons. The anisochronism is a reflection of local chirality. For achiral guests the chirality is acquired i…
Calcium silicate hydrates (C–S–H), prepared at 20 °C and 50 °C to have various CaO : SiO2 molar ratios (n), were examined for their compositions with particular attention to the combined water contents and to their solubilities in water at 30 °C. The C–S–H gels may be described as solid solutions of the type nCaO·SiO2…
Abstract 1,2‐Bis‐[4‐n‐alkyloxybenzoyl]‐hydrazines with the general formula magnified image possess smectic C phases and at lower temperatures additional optically isotropic phases. According to X‐ray investigations these isotropic phases show cubic symmetry. The lattice units consist of aggregations with micellar dime…
Measurements of the « splay » and « bend » constants for nematic 4'-n-pentyl-4-cyanobiphenyl are described. The method used was a conventional one, but particular care was taken to ensure reproducible and reliable results. The results are compared with those of previous authors and with predictions based on the mean f…
The pale yellow title compounds undergo reversible photochemical conrotatory electrocyclic reactions to give in quantitative yields deep red 7,7a-dihydrobenzo[b]furan-5,6-dicarboxylic anhydrides, which are stable at 100 °C. These photochromic systems, which have high quantum yields for photocolouration, are highly res…