| Physical Properties of the Cholesteric Mesophase. |
26 JUN 1968 |
|
| Authors:
Glenn H. Brown; KENT STATE UNIV OH LIQUID CRYSTAL INST
|
 | This report outlines research on the properties of ultrasonic waves (11 MHz, 14.5 MHz and 30 MHz) in a cholesteric liquid crystal. The method involves the measurement of the complex reflection coefficient that occurs when a transverse mechanical wave reflects from the boundary of a fused quartz substrate and a liquid crystal. Another measurement involves phase-coherent detection as a means of measuring phase-shift using ultrasonic shear waves. The reflection coefficient ... |
|
| EXPERIMENTS ON NONLINEAR OPTICS. |
05 JUN 1968 |
|
| Authors:
Y. R. Shen; CALIFORNIA UNIV BERKELEY
|
| Preliminary results on self-trapped filaments in different liquids and liquid mixtures are reported. It is shown that stimulated Raman and Brillouin scattering is probably not responsible for the filament formation. Further work is needed to determine whether Kerr effect or field-induced phase transition is the principal mechanism for self-trapping. Difference-frequency generation in the submillimeter region from quartz and LiNbO3 by beating of two ruby laser beams is reported. The difference-frequency ... |
|
| A SYSTEM FOR RECORDING TEMPERATURES IN THE VICINITY OF LIQUID SURFACES, |
13 MAR 1968 |
|
| Authors:
L. A. Kuehn; R. S. Weaver; DEFENCE RESEARCH ESTABLISHMENT TORONTO DOWNSVIEW (ONTARIO)
|
| An apparatus is described for measuring and plotting automatically the temperature distribution in the vicinity of an evaporating liquid surface, with a precision of plus or minus 0.01 degC. It consists of a thermistor, which forms one arm of an unbalanced Wheatstone bridge, a mechanism to lower the thermistor vertically through the surface and a coupled voltage divider to monitor its position. The outputs of the voltage divider and the ... |
|
| STUDY OF THE EFFECT OF LIQUID ENVIRONMENT ON THE EMBRITTLEMENT OF SOLIDS. |
JUN 1967 |
|
| Authors:
I. B. Cadoff; NEW YORK UNIV N Y RESEARCH DIV
|
| The effect of environment on the mechanical properties of solids was investigated. The two principal systems studied were: The embrittlement of copper and copper alloys in mercury and mercury amalgams. The embrittlement of silver chloride in aqueous solutions. The principal factors studied were alloy composition; microstructure, including grain size, precipitation effects, grain boundary orientation relationships; and composition of the liquid environment. In general it was found that embrittlement could be ... |
|
| COHESIVE ENERGIES IN ORGANIC LIQUIDS, |
JUN 1966 |
|
| Authors:
Edwin F. Meyer; Robert E. Wagner; Myer Rosenfeld; COATING AND CHEMICAL LAB ABERDEEN PROVING GROUND MD
|
| A method for quantitative estimation of the contributions of dispersion, induction, and orientation energies to cohesion in polar organic liquids is proposed and illustrated with the methyl n-alkyl ketones. Dispersion always predominates, with induction in a minor, but constant role. Orientation rapidly loses significance as the hydrocarbon side chain is increased. Induction energy is more important than is generally appreciated, contributing 5-10% to the total cohesion of the higher, 'mostly ... |
|
| EFFECT OF FLUID ENVIRONMENT ON TORSIONAL FATIGUE FAILURE. |
MAR 1966 |
|
| Authors:
E. F. Hutchinson; NUCLIDE CORP MEDFORD MA ALLOYD-GENERAL VACUUM DIV
|
| The fatigue process was studied in martensitic 52100 steel, martensitic 440C stainless steel and age-hardened beryllium-copper in corrosive (water) and non-corrosive fluid environments under conditions of cyclic torsional loading. The process of crack nucleation dominated the fatigue process at high strain amplitudes while crack growth was rate determining at low strain amplitudes. Corrosive environment at high strain amplitudes resulted in earlier crack nucleation and failure by formation of corrosion pits ... |
|
| THE COMPOSITIONAL ANALYSIS OF N COMPONENT SYSTEMS BY THE X-RAY ABSORPTION METHOD. |
30 APR 1964 |
|
| Authors:
Robert Lefker; ARMY ELECTRONICS LABS FORT MONMOUTH N J
|
| A method was devised for the compositional analysis of foil and liquid samples with n components (n>or=2). The method requires that in an n component system, measurements of the linear absorption be made at n different wavelengths for the unknown, and for the n pure materials that constitute the unknown. With measurements the thickness of the unknown is also determined. Matrix algebra is shown to be the necessary method of ... |
|
| STRUCTURE OF LIQUIDS. |
28 FEB 1964 |
|
| Authors:
C. J. Pings; CALIFORNIA INST OF TECH PASADENA
|
|
| DIELECTRIC DISPERSION OF A POLAR-NONPOLAR LIQUID MIXTURE NEAR THE CRITICAL SOLUTION TEMPERATURE, |
24 JUL 1963 |
|
| Authors:
R. G. Quinn; C. P. Smyth; PRINCETON UNIV N J FRICK CHEMICAL LAB
|
| The dielectric dispersion of the mixture nitrobenzene and 2,2,4-trimethylpentane was measured at a single concentration over a temperature range from 40C to the temperature of turbidity and at wavelengths of 575 m, 1.26, 3.22, and 10.0 cm. It was found that the dispersion can be characterized by a single relaxation time over most of the temperature range but that a distribution of relaxation times was necessary near the critical solution ... |
|
| EXPERIMENTAL RESEARCH ON THE EVAPORATION RATE OF A DROP OF LIQUID IN A STATIONARY HIGH-TEMPERA TURE MEDIUM, |
03 JUL 1963 |
|
| Authors:
V.M. Ivanov; Ye.V. Smirnova; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
|
| FLOW IN THIN LIQUID FILMS, |
1962 |
|
| Authors:
P. C. Scholten; K. J. Mysels; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES
|
| An improved experimental method for studying vertical soap films slowly pulled out of a solution is described and the interpretation of the optical thickness measurements is discussed. The behavior of mobile films presents complications which are described. Rigid films on the other hand give results for films thicker than 800 1100 Angstroms, which agree very closely with Frankel's law relating film thickness to the velocity of pull-out. Since Frankel's law ... |
|
| THE APPROACH OF GAS BUBBLES TO A GAS/LIQUID INTERFACE, |
13 SEP 1960 |
|
| Authors:
R. S. Allan; G. E. Charles; S. G. Mason; MCGILL UNIV MONTREAL (QUEBEC)
|
| The approach of nitrogen bubbles to the free surface of aqueous glycerol solutions and polyglycol oils was investigated using interference rings and interference colors to estimate the thickness of the liquid films. The rate of approach in close proximity to the liquid surface was found to decrease rapidly with decreasing separation. The intervening liquid film deformed with progressive thinning and, eventually, was thinnest around a ring at a distance c' ... |
|
| THE HYDRODYNAMIC STABILITY OF A THIN FILM OF LIQUID IN UNIFORM SHEARING MOTION, |
18 NOV 1959 |
|
| Authors:
John W. Miles; TRW SPACE TECHNOLOGY LABS LOS ANGELES CALIF
|
| The stability problem for a thin film of liquid having a linear mean-velocity profile and bounded by a fixed wall and free surface is solved asymptotically for large values of the Reynolds number R. The analysis is similar to that for plane Couette flow, but instability occurs for sufficiently large values of R in accordance with Heisenberg's criterion that neutral disturbances having finite wave numbers and phase velocities for R ... |
|
Reports by Keyword(s)
(LIQUIDS
