Materials Literature
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1. Conductivity and u.v. and visible spectroscopic techniques were used to investigate the solution structure of the prosthetic group of the ferric haemoproteins (ferrihaem) in dimethyl sulphoxide, NN-dimethylacetamide, NN-dimethylformamide and sulpholane, and certain of their aqueous mixtures. 2. In neutral or acid d…
The heat capacity of RbAg4I5 has been measured in an adiabatic calorimeter between 5 and 340°K. The compound undergoes transformations at 121.8 and at 209°K and exhibits a very sizable configurational heat capacity. The latent heat and entropy changes of the apparently first-order transformation at 121.8°K are 190.9 ±…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of the metal atom in the reversible uptake of molecular oxygen. The structures of the molecular oxygen complexes formed by bis[bis(diphenylphosphino)ethane]iridium(I)hexafluorophosphate and its rhodium analogJohn A. McGinnety, Nicholas C. Payne, and James A. IbersCite t…
A modified close-coupling expansion has been developed and applied to calculate elastic electron-hydrogen-atom scattering phase shifts. This expansion into a complete discrete orthonormal basis set is a variant of the more usual close-coupling expansion into eigenstates of the target Hamiltonian. We retain the first f…
Abstract Stress-induced crystallization in a rapidly stretched natural rubber gum vulcanizate has been studied using thermal techniques to follow the development of crystallinity. A special-purpose analog computer has been assembled and used online to process the thermal and mechanical data obtained in high speed tens…
Abstract The viscosity‐average molecular weight, M v , of a polymer is given operationally through its limiting viscosity number [η] and the Mark‐Houwink equation [η] = KM v α , where K and α are empirical constants. If [η] is measured under different conditions, α and M v will vary for the same sample. M v α is the α…
Abstract In Fortführung früherer Arbeiten wurden die Oberflächen‐Spannungen von NaOH‐ und KOH‐Lösungen im Konzentrationsbereich bis ζ NaOH = 0,7 und ζ KOH = 0,6 und für Temperaturen von 20 bis 170°C nach dem Prinzip des maximalen Blasendruckes gemessen und als Ausgleichsfunktionen dargestellt. Die größte relative Abwe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of high- and low-spin nickel(II) complexes containing the macrocyclic ligand tetrabenzo[b,f,j,n,][1,5,9,13]tetraazacyclohexadecineStuart W. Hawkinson and Everly B. FleischerCite this: Inorg. Chem. 1969, 8, 11, 2402–2410Publication Date (Print):November 1,…
The standard method of determining the index homogeneity of optical-quality glass windows has been extended to improve the accuracy of the results, and to enable disks of over 20 in. (50 cm) in diameter to be evaluated with comparative ease. The evaluation of a 34 in. (85 cm) diameter disk of fused silica illustrates…
Measurements of the thermal conductivity and Righi-Leduc coefficient of Cd 3 As 2 have been made in a transverse magnetic field of up to about 2 T, at temperatures between 68 °K and 300 °K. For one sample the measurements have been extended down to 8 °K. The measurements have allowed the separation of the lattice and…
The site symmetry of Nd3+ in single-crystal [(C6H5)3PH]3NdCl6 is predicted by considerations of molar absorptivity, vibronic spectra, and stoichiometry. A calculation of the crystalline-field splitting of 4f3 J levels appears to predict a sixfold octahedral site symmetry with a slight distortion along one of the axes,…
A general theory of optical-aberration tests, encompassing many well-known practical tests, is presented, utilizing the formalism of spatial filtering, employing coherent illumination. The basic diffraction integrals of the Ronchi-grating test, Foucault knife-edge test, phase Foucault knife-edge test, and the Zernike…
Spin echoes and their external magnetic field effects have been observed on Heusler alloys, Cu 2 MnAl, Cu 2 MnIn and Cu 2 MnSn at 4.2°K. The sign of the internal magnetic field at nuclei of the constituent elements has been determined to be negative, and on the basis of the R-K-K-Y interaction semiquantitative agreeme…
Cr 7 Te 8 exhibits two types of crystal structure according to the difference of thermal treatment; one is the ordered and the other is the disordered arrangements of the vacancies among the successive Cr layers. The saturation moments and the magnetic susceptibilities of both structures are measured in the temperatur…
Une analyse générale de la topologie des dislocations dans les corps mésomorphes conduit à distinguer des "disinclinaisons" parfaites dont la rotation est parallèle ou perpendiculaire à l'axe hélicoïdal d'un cholestérique. L'appariement de deux disinclinaisons du second type, de signes opposés, donne un mode de dissoc…
Infrared spectra of pyridine-H5 and pyridine-D5 in the solid state were measured between 4000 and 200 cm− 1. Frequencies and polarization of fundamental absorptions were established for oriented thin films of freshly crystallized samples. Behavior of the bands in polarized light aided in clarifying several assignments…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text P. F. Mullney and P. N. Dean, "Cell Sizing: a Small-Angle Light-Scattering Method for Sizing Particles of Low Relative Refractive Index," Appl. Opt. 8,…
Abstract The changes occurring when polythene melts are subjected to shear, have been investigated using a rotating bob fitted into a ram extruder. In addition to chain scission, low density polythene exhibits reversible changes in mechanical and viscoelastic properties. The magnitude of the changes is controlled by t…
The enzymic activity of acetylcholinesterase can be photoregulated through the mediation of photochromic inhibitors of the enzyme. N-p-phenylazophenyl-N-phenylcarbamyl fluoride, an irreversible inhibitor of acetylcholinesterase, exists as two geometric isomers which are interconvertible through the action of light. Th…
Abstract A useful concept in polymer science is the degree of crystallinity—the fraction of the polymer that exists in a relatively ordered state. Methods of determination of the degree of crystallinity using density, infrared, thermal, N.M.R. and X ‐ray measurements are examined in light of modern notions of the stru…