DETERMINATION OF EXCHANGEABLE CATIONS IN CALCAREOUS SOILS
Centro de Edafologia y Biologia Aplicada del Segura, Murcia, Spain Institute of Pedology, Uppsala, Sweden
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Impurity Effects on the Transition Temperature of Magnetite
Influence of oxidization and various impurities on the transition temperature of the Verwey order in magnetite was studied experimentally. A small amount of impurities such as Li, Ni, Co, Cr, Al, Ti, Mg, Zn and Ga was doped and the transition temperature was determined by magnetic measurement. The decreases of the tra…
On the Interaction of the Electromagnetic Field with Heat Conducting Deformable Insulators
The differential equations and boundary conditions describing the behavior of a finitely deformable, polarizable, and magnetizable, heat conducting continuum in interaction with the electromagnetic field are derived by means of a systematic application of the laws of continuum physics to a well-defined macroscopic mod…
Effects of Oxygen on Silver Surface Structure
The chemisorption of oxygen on the (100), (110), and (111) faces of silver single crystals was studied with LEED, secondary electron spectroscopy, and other auxiliary techniques. The effect of exposures to oxygen at pressures up to 1 Torr and temperatures up to 500 °C was investigated using a crystal isolation valve.…
The Identification of Modal Resonances in Ferrite Loaded Waveguide Y-Junctions and Their Adjustment for Circulation
This paper reports on extensive eigenvalue measurements made on an X-band waveguide Y-junction containing different ferrite geometries. The frequency dependence of the eigenvalues is used to identify the principal field modes involved, to examine their sensitivities to various junction parameters, and to arrange their…
Electrode Polarization of Ionic Conductors
Polarization observed on applying ac and dc electric fields to samples of β alumina, sodalime glass, and single crystals of sodium chloride have been studied. It is concluded that the large capacitances shown by these materials, which are generally attributed to space-charge effects, are more likely caused by reaction…
Crystal structures of hydrated lanthanide(III) nicotinates, La2(C5H4NCO2)6(H2O)4 and Sm2(C5H4NCO2)6(H2O)4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of hydrated lanthanide(III) nicotinates, La2(C5H4NCO2)6(H2O)4 and Sm2(C5H4NCO2)6(H2O)4Jerry W. Moore, Milton D. Glick, and W. A. Baker Jr.Cite this: J. Am. Chem. Soc. 1972, 94, 6, 1858–1865Publication Date (Print):March 1, 1972Publication History Published…
A superlattice with monoclinic symmetry based on the compound V6C5
The ordered distribution of carbon vacancies in the compound V6C5 has been analysed by electron diffraction and dark-field electron microscopy. The dominant structure is that based on a superlattice with monoclinic symmetry having a lattice orientation relation with the disordered cubic matrix which may be summarized:…
Continuum Measures of Spall Damage
Following the introduction of the concept of continuous spall damage as a replacement for the customary discrete description, existing spall criteria are generalized to continuous measures of damage and are classified according to their dependence on the history of the continuum field variables. A compound-damage-accu…
Secondary nucleation in a class II system: Ammonium sulfate‐water
Abstract Secondary nucleation at low supersaturation for the ammonium sulfate‐water system was studied using a seeded continuous crystallizer. Counter size distribution measurements in the subsieve size range indicated that nuclei are formed by microattrition of seed crystals and that the growth rate of the nuclei is…
Elastic and Piezoelectric Properties of Ferroelectric 5PbO · 3GeO2 Crystals
The elastic, piezoelectric, and dielectric constants of a new ferroelectric crystal 5PbO · 3GeO2 have been measured. The measurements involve mostly the use of thickness modes in small plates of various crystallographic orientations. The electromechanical coupling factors turn out to be small, which makes this materia…
Stereochemistry of low-spin iron porphyrins. II. Bis(piperidine)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatoiron(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin iron porphyrins. II. Bis(piperidine)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatoiron(II)L. J. Radonovich, Allen Bloom, and J. L. HoardCite this: J. Am. Chem. Soc. 1972, 94, 6, 2073–2078Publication Date (Print):March 1, 1972Publication His…
Interaction of 25 keV Electrons with the Nucleic Acid Bases, Adenine, Thymine, and Uracil. II. Inner Shell Excitation and Inelastic Scattering Cross Sections
The energy loss spectra of 25 keV electrons traversing thin films of the nucleic acid bases adenine (C5N5H5), thymine (C5N2O2H6), and uracil (C4N2O2H4) have been obtained at room temperature in the region of K-shell excitation (>285 eV), and fine structure near the carbon K edge of these materials has been anal…
Interaction of 25 keV Electrons with the Nucleic Acid Bases, Adenine, Thymine, and Uracil. I. Outer Shell Excitation
The energy loss functions — Im(1/ε) of thin films of the nucleic acid bases, adenine (C5N5H5), thymine (C5N2O2H6), and uracil (C4N2O2H4) have been determined in the range 2–50 eV from energy loss experiments with 25 keV electrons at room temperature. An analysis of the electronic structure of these materials in the re…
A Theoretical Analysis of the Weak-beam Method of Electron Microscopy
Abstract The geometry of lattice defects can be studied in detail using the weak-beam method 1 of high resolution electron microscopy. In this paper the theoretical basis of the method is discussed, and the experimental conditions which are necessary if particular methods of image interpretation are to be used are con…
Potential-Barrier Effects in Photoabsorption. II. Interpretation of Photoabsorption Resonances in Lanthanide Metals at the4d-Electron Threshold
The resonances in the photoabsorption spectra of the lanthanides near the $4d$ absorption edge are interpreted as transitions of the type $4{f}^{10}4{f}^{N}\ensuremath{\rightarrow}4{d}^{9}4{f}^{N+1}$. Calculations of the $4{d}^{9}4{f}^{N+1}$ energy levels and relative $\mathrm{gf}$ values for these transitions are sho…
Review of Basic Oxidation Processes in Elastomers
Abstract The early studies of chain scission in the oxidation of rubber by Dr. E. M. Bevilacqua, and his subsequent work on the identification of the various acids, methyl ketones, and other volatile products of the oxidation reaction, have contributed much to our present knowledge of the nature of the processes invol…
Magnetism of rare-earth elements, alloys, and compounds
The magnetic properties of the rare-earth metals and a number of the alloy and compound systems formed with rare earths are discussed. Emphasis is placed on current experimental results of bulk magnetic measurements and related transport phenomena and their bearing on theoretical studies. Topics covered include exchan…
Magnetic Properties of Cr3Te4 in Ferromagnetic Region
Single crystals of Cr 3 Te 4 with the pseudo-NiAs type structure have been made by chemical transport method in order to investigate the anomaly below 80 K. The saturation moment at 4.2 K is equal to 1.79±0.03 µ B per Cr 1- x Te (x=0.25), and the Curie temperature is 316 K. The magnetization only in the direction to t…
Liquid-Crystal Diffraction Grating
Application of an electric field to a thin layer of nematic liquid-crystal causes the formation of a lattice of cylindrical lenses within the liquid-crystal material. An expression for the far-field diffraction pattern of light transmitted through this lattice is derived. The observed diffraction pattern agrees with t…