Neutron scattering studies of liquid diffusion
(1962). Neutron scattering studies of liquid diffusion. Advances in Physics: Vol. 11, No. 43, pp. 203-232.
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Optical Properties of Diamond in the Vacuum Ultraviolet
The optical constants of diamond have been determined in the range 5.5 to 23 eV by applying the Kramers-Kronig relation to normal incidence reflectance data. There are two salient features in the curve for optical absorption. First, the absorption rises rapidly near 7 eV, indicating the onset of strong direct transiti…
Colloidal structure of brain
A combined rheological and dark-ground microscopical study of mouse brain tissue is reported. In its near physiological state, brain tissue is an aggregate of hydrophilic colloidal particles with marked ion- and water-binding capacity. The colloidal
Gasförmige Hydroxide. IV. Über gasförmige Hydroxide des Molybdäns und Wolframs
Abstract Im Temperaturbereich von 600–690°C wird von MoO 3 , im Temperaturbereich von 900–1100°C von WO 3 , die in Gegenwart von Wasserdampf erhöhte Flüchtigkeit der Oxide mit Hilfe der Mitführungsmethode studiert. Die gemessenen Gleichgewichte werden formuliert nach Für beide Reaktionen werden thermochemische Daten m…
Properties of Bi2Te3-Sb2Te3 Alloys
The phase diagram for the Bi2Te3–Sb2Te3 pseudo-binary system is of the solid-solution type, where the distribution coefficient k is equal to unity at 33.3 and 66.7 mole % Sb2Te3. The c lat tice parameter remains essentially constant across the diagram at 30.49 Å for both slowly crystallized and quenched alloys. For qu…
Diffraction Anomalies in Grating Spectrophotometers
The Wood anomalies are dark or bright bands in the spectrum produced by a diffraction grating. They occur at observed wavelengths for which light of the same wavelength is diffracted in another order so as to graze the surface of the grating. The equations describing the position of the anomalies are discussed for a v…
Diffusion of Gas from a Liquid into an Expanding Bubble
The growth of a bubble within a volume of isothermal viscous liquid containing uniformly distributed dissolved gas is considered. The problem of characterizing this growth-by-mass-transfer is reduced to an integro-differential equation for the bubble radius as a function of time, and a computer solution is obtained. T…
On Variance as a Measure of Line Broadening in Diffractometry General Theory and Small Particle Size
The mean-square breadth of a deliberately truncated portion of a diffraction line has been suggested as a measure of particle size by Tournarie. Tournarie's theory is generalized to include other causes of line broadening. For small particle size it is shown that the mean-square breadth in 2θ can be expressed in the f…
Elastic Constants of Single-Crystal Mo and W between 77° and 500°K
Using a high frequency cw mechanical resonance technique, the adiabatic elastic constants of single crystals of molybdenum and tungsten were measured between 77° and 500°K.
Work Function, Photoelectric Threshold, and Surface States of Atomically Clean Silicon
The position of the Fermi level at the surface has been determined over the entire available range of bulk dopings for atomically clean (111) silicon surfaces cleaved in a vacuum of ${10}^{\ensuremath{-}10}$ mm Hg. Surface potential is found from the difference in work function and photoelectric threshold. The latter…
Das Adsorptionsverhalten sehr dünner Kohlenstoff‐Folien
Sehr dünne Kohlenstoff-Folien wurden erhalten: durch Reduktion einer Suspension von Graphitoxyd (G. O.) in verdünnter Natronlauge, durch Verpuffung von G. O. beim Erhitzen. Die Adsorption von Stickstoff, von Methylenblau und von Phenol wurde gemessen; außerdem wurde die katalytische Leistung bei der HBr-Synthese besti…
Spin-Lattice Relaxation in Some Rare-Earth Salts at Helium Temperatures; Observation of the Phonon Bottleneck
By observing the transient recovery of microwave paramagnetic resonance signals at $\ensuremath{\nu}\ensuremath{\approx}9.3$ kMc/sec and $\ensuremath{\nu}\ensuremath{\approx}34$ kMc/sec, we measure the spin-lattice relaxation rate ${{T}_{1}}^{\ensuremath{-}1}$ for the rare earth ions Nd, Pr, and Sm in the double nitra…
Ordering Energy Levels of Interacting Spin Systems
The total spin S is a good quantum number in problems of interacting spins. We have shown that for rather general antiferromagnetic or ferrimagnetic Hamiltonians, which need not exhibit translational invariance, the lowest energy eigenvalue for each value of S [denoted E(S) ] is ordered in a natural way. In antiferrom…
Observations sur l'accouplement des Chiropters
Digital Repository of Scientific Institutes (RCIN) was established and is being developed mainly as an outcome of two projects acquired and jointly accomplished by a group of Polish scientific institutes.
Aragonite in the Resilium of Oysters
Aragonite (orthorhombic CaCO 3 ) composes some of the fibers of the resilium of Crassostrea virginica (Gmelin).
The Boltzmann equation for anisotropic metals
Abstract It is pointed out that the Boltzmann equation in the theory of metals reduces to a finite set of linear algebraic equations whenever the scattering probability can be written as a finite sum of the form Σpi(k) qi(k´) . The explicit form of the solution, valid for arbitrary energy surfaces, is derived for this…
Low-Temperature Thermal Conductivity of Amorphous Solids
The thermal conductivities of five samples of commercial glasses and glass ceramics were measured at liquid helium temperatures. It was found that the conductivity data could be accounted for by an intrinsic structure scattering of phonons as proposed by Klemens combined with an internal boundary scattering. The intri…
Space-Charge-Limited Currents in Iodine Single Crystals
Transient and steady-state measurements of space-charge-limited hole photocurrents in iodine generated at one electrode are presented. The hole drift mobility perpendicular to the $\mathrm{ac}$ crystallographic plane is 0.7 ${\mathrm{cm}}^{2}$/v sec and varies with temperature approximately at ${T}^{\ensuremath{-}1.2}…
Optical Emission from Irradiated Foils. I
The present work is concerned with the emission of optical radiation from foils irradiated with charged particles. A generalization of the Ginsburg-Frank treatment is presented in which the wave properties of normally incident charged particles are accounted for in the Born approximation. The foil is assumed to be of…
Nuclear Magnetic Resonance Study of Collagen Hydration
The proton resonance signal of water in partially dried tendon shows three peaks for samples equilibrated in an atmosphere of 30%—80% relative humidity (R.H.). The outer-peak splitting (between 0.5 and 1 gauss) has the character of a proton-pair splitting with effective interactions in, or close to, the fiber directio…