The Temperature Dependence of the Viscosity of Liquid Metals
(1962). The Temperature Dependence of the Viscosity of Liquid Metals. Nuclear Science and Engineering: Vol. 12, No. 3, pp. 436-439.
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Minimum differences in height detectable in electron stereomicroscopy
Measurements were carried out to test the validity of Heidenreich and Matheson's relation for the vertical resolution attainable in electron stereomicroscopy. Relative elevations much smaller than this relation would allow were readily detected. Considerations are advanced which indicate that if certain considerations…
Initiation of Boiler Scale Formation
This paper describes part of a programme of fundamental study of scale formation. The work described here is concerned with the initiation of scale formation at a heating surface where boiling is taking place. The crystalline ring formations first observed by Partridge (I) with calcium sulphate solution were seen usin…
Polymer–diluent interactions. III. Polyethylene—diluent interactions
Abstract The interactions between polyethylene and a number of hydrocarbon diluents were characterized on the basis of the Flory‐Huggins interaction parameter χ and the closely related heat of mixing parameter B . The evaluations of these parameters were based on Flory's statistical‐thermodynamic treatment of the effe…
Some Magnetic First-Order Transitions
Some transitions between ordered and disordered magnetic states that take place via transitions of first order are tabulated. Among these transitions are some of the order-disorder type. The theoretical basis for such a transition to occur is indicated using a simple physical model that assumes: (1) a strain dependent…
Dislocation loops and irradiation growth in alpha uranium
A successful electropolishing technique has been developed for preparing thin films of uranium with good transmission characteristics for electron microscopy. The technique has been applied to the study of irradiation damage in uranium, particularly the irradiation growth phenomenon. Dislocation loops are formed durin…
Transient Compressional Waves in an Infinite Elastic Plate or Elastic Layer Overlying a Rigid Half-Space
The problem treated is that of an infinite free plate excited symmetrically by two equal and normally opposed step point-loads on its faces. The problem is equivalent to that of the surface normal point-load excitation of an infinite elastic layer, half the thickness of the plate, overlying a rigid half-space with lub…
Color Centers in CsCl-Type Alkali Halides
A study of x-ray-induced color centers in the CsCl-type alkali halides has been made at room, liquid nitrogen, and liquid helium temperatures. The gross features of this coloration are similar to those observed in NaCl-type alkali halides, namely a principal absorption band in the visible portion of the spectrum with…
Quadrupolar Nuclear Relaxation in the III-V Compounds
The results of nuclear quadrupolar spin-lattice relaxation time ${T}_{1}$ measurements in most of the III-V compounds and germanium are presented and discussed. It is shown that the ${T}_{1}'\mathrm{s}$ may be correlated with the quadrupole interaction for a free atom and appear to be relatively insensitive to differe…
The morphology and internal structure of poly(ethylene oxide) spherulites
Abstract The development of spherulites in thin films has been observed. At low supercoolings they develop scalloped edges, with each scallop sector having a branched structure reminiscent of a fern frond. At high supercoolings they develop smooth circular boundaries. An x‐ray diffraction study has been made both of t…
Rate of Thermal Dehydration of Kaolinite in Vacuum
The dehydration of kaolinite was carried out in a vacuum to evaluate the kinetics without the marked effect of water vapor. Samples of carefully fractionated particles were used and the effect of surface area was determined. At pressures in the order of 1μ of Hg the reaction was found to be diffusion‐controlled, with…
Electronic and Ionic Conductivity in Single Crystals of MgO
The electrical conductivity and relative fractions of ionic and electronic conductivity of single crystals of MgO were measured between 1000° and 1500°C. The results resolve conflicting observations of electronic and ionic conductivity of previous investigations in that MgO is shown to exhibit both kinds of conductivi…
Mechanical aspects of panting in dogs
Apparently healthy, unanesthetized dogs weighing 12.3 ± 1.8 kg were caused to pant by the warming effect of incandescent lamps. Panting frequency was recorded and found to be 5.33 ± 0.7 cycles/sec. The natural frequency of the respiratory system of each of the animals was then determined, the mean being 5.28 ± 0.3 cyc…
The effect of pressure and temperature on the specific volume of polyethylene
Abstract A spherulitic crystallization process can be divided into three successive stages: the formation of spherulite centers, the growth by means of crystalline fibrils with many branches extending into the melt, and finally crystallization of the intervening regions between these already crystallized fibrils. The…
Recent Developments in Soft Magnetic Alloys
The present status of soft magnetic alloys used in power generation, communication, and special devices applications will be reviewed with emphasis on future prospects for their improvement. Although the study of microscopic structure of magnetic materials has led to important advances, present and future improvements…
Alumina Whisker Growth on a Single-Crystal Alumina Substrate
Alumina whiskers have been grown on single-crystal alumina substrates by heating aluminum filings, located near the crystals, to 1400°C in a stream of wet hydrogen. The whiskers grew crystallographically coherent with the substrate, and had their axes either parallel to the c axis or in one of 12 equally spaced direct…
Magnetic Properties of Cr5S6 in Chromium Sulfides
Several samples of CrSx with 1.145<x<1.200 were carefully prepared and chemically analyzed. The expected crystal structures were verified by x-ray analysis, which failed to indicate the presence of any impurities. Conductivity measurements indicated the existence of metallic conductivity in these samples…
Magnetic Transitions in Cubic Spinels
Magnetization curves of the cubic spinels MnCr2O4, CoCr2O4, MnV2O4, and CoV2O4 have been obtained between 4.2°K and their Curie points. With the possible exception of MnV2O4, all the curves indicate the presence of a magnetic transition within this temperature range. Although all these materials have been reported to…
The Fluorescence and Scintillation Decay Times of Crystalline Anthracene
The experimental data are analysed with the following conclusions. The molecular decay time τ0 of a thin anthracene crystal lamina at room temperature is 10 nsec. The thick crystal values are increased by self-absorption to 31.6 nsec (volume excitation, e.g. by γ-rays), 24.1 nsec (surface excitation, e.g. by ultra-vio…
Permanent Magnetic Properties of Iron-Cobalt-Phosphides
An investigation of the phase relations of the section Fe2P–Co2P in the system Fe–Co–P showed that at high temperature all (Fe, Co)2P alloys, including the final components Fe2P and Co2P, probably form a continuous range of solid solutions having the hexagonal Fe2P structure. At low temperatures Fe2P and Co2P form an…