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This report includes: DIFFRACTION PATTERNS PRODUCED BY FINITE AMPLITUDE WAVES, by M. A. Breazeale and E. A. Hiedemann. 6 Feb 61. (Reprint from the Jnl. of the Acoustical Society of America 33:700-701, May 61) LIGHT DIFFRACTION BY PROGRESSIVE ULTRASONIC WAVES IN PLEXIGLAS, by W. G. Mayer and E. A. Hiedemann. 14 Mar 60. (Reprint from Acustica 10:252, 1960) DIFFRACTION OF LIGHT BY ULTRASONIC WAVES OF VARIOUS STANDING WAVE RATIOS, by B. D. Cook and E. A. Hiedemann. 16 Jan 61. (Reprint from the Jnl. of the Acoustical Society of America 33:945-948, July 61) EXPERIMENTAL STUDIES OF THE LEAST STABLE WAVEFORM, by M. A. Breazeale. (Presented at the 61st National Meeting of the Acoustical Society of America, May 1961): The experiment was designed to demonstrate the inversion of waveform on reflection from a pressure release boundary, in propagation through a liquid, and the decrease of distortion with distance.

CU-23-54-ONR-271-Phys.

In order to derive a method of predicting thermocline depth, BT data and associated weather conditions at the Atlantic Ocean Weather Station (OWS) CHARLIE (52 degrees N, 35 degrees W) were studied. Selected groups of bathythermograms covering one or several days were used to compute mean level of the interface between the mixed layer and the thermocline. Velocity and vertical extent of pure wind current are considered to be proportional to the surface wind-wave parameters. A mixing parameter, k, which is a function of wave amplitude A, wavelength and mixed-layer thickness was determined from the BT groups and associated weather data. Mixing parameter is considered to be proportional to the vertical component of the mixing length at the interface of the mixed layer and the thermocline. As a function of sea state parameter and stability index mixing parameter is applied to mean thermocline depth prediction by use of different functional curves for sea state in uniform current flow or in convergent and divergent current conditions. (Author)

The investigation of the shoreward travel of a bore into water at rest is extended to beaches of non-uniform slope. It is shown that the shore ingularity established in the earlier invetigaion furnishes again an approximate solution. The shape of the beach, like the shape of the wave forming the bore, is found to influence the bore development close to the shore almost only through the basic velocity scale of the bore. (Author)

A simple, quick measurement of narrow (about 1 oersted) line width ferromagnets by the use of re-radiated microwave fields is described. The equations of motion are combined with the electromagnetic field equations and then solved to show what is being measured and how the measurement should be made. Experimental equipment is described in detail. (Author)

Iden ifiers: Solar wind. The most general form of hydromagnetic KelvinHelmholt discontinuity in ideal incompressible fluids was considered. The stability of the hydromagnetic flow of two uniform infinite streams with planar interface exhibiting this type of discontinuity was analyzed in detail. Necessary criteri for it stability were obtained. A disturbance of the table in erface propagates as hydromagnetic surface waves. Inst bility of the interface leads to gro ing surface waves A new theory is developed of geom gnetic micropulsations, in which the solar wind-exosphere int rface is viewed as a surface of hydromag etic Kelvin-Helmholtz discontinuity. The sunlit side of this interface is unstable under most condi ions of solar activity. In the cour e of this work, a critical examination of the ingle fluid approximations of the plasma equations was made. A rigorous derivatio of the boundary conditions in an ideal incompressible hydromagnetic fluid is given. (Author)

The Kolos and Roothaan wave function for H2 has been analyzed into natural orbitals. It was found that the first natural orbital is nearly the SCF function. The first four natural orbitals provide a good description of the molecule and give a total energy of -1.169884 Hartrees. Beyond the first four terms, the natural expansion becomes more slowly convergent. (Author)

The validity of the distorted wave (dw) approximation for the solution of the vibrational energy transfer problem is investigated. T HE BEHAVIOR OF THE TRANSITION PROBABILITY INTEGRAL IS SHOWN TO BE DETERMINED BY HE BEHAVIOR OF ITS INTEGRAL AT A SINGLE POINT. This critical point is used to obtain an exact solution of the transition probability with which the dw solution is compared. The dw solution is found to lie within 20% of the exact solution whenever the transition probability is less than roughly 0.6. The existence of the critical point leads to a simple expression for the transition probability in terms of an arbitrary interaction potential. The effects of adiabatic changes due to short range repulsive forces are investigated by means of the method of perturbed stationary states. (Author)

A set of kinematic equations are obtained from the Pines- chrieffer formul tio to de cribe the approach to equilibrium of electrons and collective oscillations in a pla ma. The kinematic equations contain the conservation laws which the Pine -Schrieffer formulation satisfies. The ki ema ic formulation is appli d to an a aly sis of he ime-dependent behavior of a plasma which is unstable against a growing plasma wave. A close comparison is made with the analysis carried out by Drummond a d Pines for a similar situation; the equivalence of the two treatments in a numb r of fundamental predictions is established. The role played by th spontaneous emission of plasma waves is also discussed. (Author)

Analyse van de gegevens van de golfpalen OSII, OSIII, OSIV en BGI over de periode 1957-1962. Relatie tussen Hs, windrichting, windsnelheid, windduur, strijklengte, stroomsnelheid en waterdiepte., Deltawerken