Introduction to Nuclear Engineering
"Introduction to Nuclear Engineering." Nuclear Science and Engineering, 12(2), pp. 315–316
Materials Literature
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Hardness of Nonmetallic Solids on an Atomic Basis
Hardness values of 65 nonmetallic crystalline solids of 16 different structures are compared with data of a newly introduced concept: "the volumetric lattice energy." When such solids are classified according to a new interpretation of lattice anharmonicity, a set of linear interrelations is obtained which covers the…
Thermal degradation of polypropylene
Abstract The molecular weight distributions of polypropylene samples subjected to various degrees of thermal degradation were experimentally determined and compared with those expected theoretically for random scission of the polymer chains. The comparison demonstrated that the chain breakage is predominately random a…
The crystal structure of polyethylene adipate and polyethylene suberate
The structures of the crystalline regions of cold-drawn fibres and highly oriented, stretched rubberlike specimens of polyethylene adipate (PEA) and polyethylene suberate (PES) have been determined. The unit cells are monoclinic with one chemical unit per fibre repeat and two chains per cell. The cell dimensions are:…
Activation of Hydrogen by a Transition Metal Complex at Normal Conditions Leading to a Stable Molecular Dihydride
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of Hydrogen by a Transition Metal Complex at Normal Conditions Leading to a Stable Molecular DihydrideL. Vaska and John W. DiLuzioCite this: J. Am. Chem. Soc. 1962, 84, 4, 679–680Publication Date (Print):February 1, 1962Publication History Published online1 May 20…
Stresses in Glass Produced by Nonuniform Exchange of Monovalent Ions
A study was made of the rate of diffusion of alkali ions into a soda‐lime glass from nitrate melts, and the distortion of glass disks produced by the stresses thus developed was measured using an interference technique. A maximum of 124,000 psi was produced when Na + was replaced by K + . Tensile stresses accompanying…
Interlayering of Expansible Layer Silicates in Soils by Chemical Weathering
Abstract Interlayering of 2: 1 layer silicates varies as a function of chemical weathering from the simple, homogeneous K or Na interlayers of micas to the heterogeneous systems of mica intercalated with expanded 2: 1 layer silicates. “Frayed edge” type of weathering at dislocation planes of mica is collated with K re…
Segregation of Solute Atoms to Stacking Faults
An experimental evidence was given for the segregation of solute atoms to stacking faults in alpha-brass. The stacking fault energy in an alpha-phase solid solution with face-centered cubic structure usually decreases continuously with the increasing concentration of solute atoms. The solute atoms in that alloy tend t…
Measurement of Equilibrium Concentrations of Lattice Vacancies in Gold
The linear thermal expansion of a 99.999% gold bar has been measured throughout the range 15\ifmmode^\circ\else\textdegree\fi{} to 1057\ifmmode^\circ\else\textdegree\fi{}C by direct observation of the length expansion $\frac{\ensuremath{\Delta}L}{L}$, with filar micrometer microscopes and by measurement of the lattice…
Some Properties of Bismuth Perovskites
The crystallographic and dielectric properties of complex perovskites are described in terms of average A- and B-site ionic radii, charges, and electronic structures. The relative importance of these to the ferroelectric state is evaluated by a study of a number of solid solutions containing trivalent bismuth. Two new…
Fluorescence Spectrum and the Energy Levels of the Sm2+ Ion
Sm2+ which occurs as impurity in very small concentrations in LaCl3 has a very distinctive fluorescence spectrum which resembles in all details that of Eu3+. Excitation is through the very strong continuous absorption to 4f55d in the visible. The energy is transferred to the stable states 5D0 and 5D1 of the 4f6 config…
Semiconductive Properties of Tetracyanoethylene Complexes and Their Absorption Spectra
The absorption bands characteristic of the solid molecular complexes of tetracyanoethylene are attributed to the charge transfer interaction between tetracyanoethylene and donor molecules. In the complexes with polycyclic aromatic hydrocarbons the energy gap associated with the semiconductivity agrees well with the en…
High-Temperature Evaporation and Thermodynamic Properties of Zirconium Diboride
Vapor pressures of zirconium over zirconium diboride have been measured by the Knudsen technique over the temperature range 2150° to 2475°K. A new type of apparatus was constructed and used successfully in the study. Zirconium diboride was determined to evaporate congruently at a composition of ZrB1.906(+0.025 or —0.0…
Influence of Ion Size upon the Intensity of Eu3+ Fluorescence in the Tungstates
The emission intensities of the rare-earth ions in inorganic compounds are sensitive to changes in structural parameters, the charge type of the cations, and rare-earth concentration. Comparisons of the fluorescence of Eu3+ in a number of related tungstates show that under long-wave ultraviolet excitation comparable s…
Calorimetry in Liquid Thallium Nitrate-Alkali Nitrate Mixtures
The enthalpies of mixing in the binary liquid mixtures of thallium nitrate with lithium-, sodium-, potassium-, and rubidium nitrate have been measured at 350°C. It is found that the molar enthalpy of mixing (ΔHM) varies in a somewhat irregular manner as the size of the alkali ion is varied. In this respect these syste…
New Ferroelectrics of the Tetramethylammonium-Trihalo-Mercurate Family
Three new ferroelectrics belonging to a family of the general formula $[X{(\mathrm{C}{\mathrm{H}}_{3})}_{4}]\mathrm{Hg}{Y}_{3}$ (where $X=\mathrm{N},\phantom{\rule{0ex}{0ex}}\mathrm{P}$; $Y=\mathrm{C}\mathrm{l},\phantom{\rule{0ex}{0ex}}\mathrm{B}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{I}$) were discovered. They ar…
Nucleation by Cosmic Rays in Ultrasonic Cavitation
Nucleation in ultrasonic cavitation is due to cosmic rays. The neutron component seems sufficient to explain the experiment in water, through the creation of oxygen recoil nuclei which would act as nucleating agents; energy deposit and radiolytic effects produce small overheated and oversaturated regions in which cavi…
Infrared Spectra of Metal Chelate Compounds. VI. A Normal Coordinate Treatment of Oxalato Metal Complexes
The infrared spectra of 10 oxalato complexes have been obtained in the frequency range 4000 to 300 cm—1. A normal coordinate treatment made on the 1:1, metal:ligand model of the chelate ring of tris-(oxalato)-Cr(III) resulted in the assignment of metal-oxygen stretching bands in the range between 600 and 300 cm—1 for…
Les niveaux-repères dans le Bassin de Carmaux : Gores et Tonsteins
Plusieurs veines du bassin de Carmaux présentent des intercalaires stériles à faciès particulier, qui ont été spécialement étudiés (diffractométrie, mesure de la radioactivité, dosage des alcalins). On a pu distinguer : — des tonsteins typiques (à quartz et kaolinite) en veine I-Marmottan et en veine G. — des gores (a…
Effects of Addition of Titanium, Niobium and Tungsten on the Scales of Ni-Cr-Base Alloys at High Temperatures
Studies were made by X-ray diffraction method on the scales formed on the surfaces of Ni-Cr-Ti, Ni-Cr-Nb and Ni-Cr-W alloys. The following results have been obtained. (1) NiOTiO2 was formed in the scales of Ni-20Cr-1Ti alloy at temperatures above 1100°C, and in those of Ni-20Cr-2Ti alloy above 1000°C. NiO, NiOTiO2, Cr…