bluuebunny/crossref_metadata_2025 huggingface dataset:
On Scintillation of Radio Sources
Authors: Aarons J
Published: May 2011

In a communication concerning scintillation of discrete radio sources and geomagnetic activity, relative to transit observations (within 45� of zenith) Slee (1962) found correlation between scintillation and geomagnetic indices. Scintillation activity was assessed as low if none of the radio sources showed detectable scintillation or if scintillation occurrence was isolated and high when all sources exhibited intense scintillations for several hours during the night.
Gauge-Independent Theory of Symmetry. II.
Authors: Buchdahl HA , Tassie LJ
Published: May 2011

This paper develops a gauge-independent symmetry theory of non-relativistic quantum mechanical systems, in line with that previously considered in the context of classical mechanics. We first discuss at length the motivation for adopting the view that the invariance of a system K under a physical symmetry operation .<I' should be taken to mean invariance of the equation of motion of K under a certain gauge-independent unitary transformation U c( .<1'). The formal development of the theory is then carried through, and some detailed examples are presented. In particular, corresponding to every direction along which a system K happens to be translation invariant there exists a gauge-independent generator of translations which leaves K invariant but which is not, in general, a component of either the canonical or the kinetic momentum. The connexion between such invariant generators of translations and the so-called magnetic translation operators is referred to.
The Nature and Velocity of the Sources of Type II Solar Radio Bursts
Authors: Late AA Weiss The
Published: May 2011

Velocities of the sources of type II bursts are derived from rates of frequency drift using standard density models, both statistically for 21 bursts, and individually for 5 bursts extending over wide frequency ranges. The derived velocities exceed the speed of sound in the magnetic-field.free corona: on the average the velocity decreases with increasing height to a minimum of ,....., 750 kmjs at a little below I Ro' and j,hereafter slowly increases with height. The nature of the type II source is discussed in relation to these velocities, and also in relation to detailed measurements of harmonic ratios and band splitting for the five individual bursts. It is suggested that the type II source is either a strong parallel shock (direction of propagation of shock parallel to magnetic field) or a perpendicular shock. Magnetic field strengths of 2-20 G at 0�5 R 0 above the photosphere, decreasing to 1-10 G at 2 Ro, are derived. Finally, it is shown that theories by which fundamental emission arises in front of the shock, whilst harmonic emission originates in the interior of the shock, are untenable.
An Electromagnetic Force Theorem for Quasi-stationary Currents
Authors: Smith WE
Published: May 2011

It is shown that the time-averaged magnetic forces produced in a system excited by quasi-stationary currents may be expressed in terms of derivatives of effective inductance parameters in a manner similar to that of magnetostatics. Practical applications of the theorem include electromagnetic levitation, the absolute calibration of electrical measuring instruments, and the assessment of mechanical stresses in magnet assemblies.
Thermal Expansion and Other Properties of Sodium Chloride
Authors: Powell DGM , Fletcher GC
Published: May 2011

A previous calculation by one of the authors of the equation of state of an anharmonic rigid-ion model of sodium chloride has been corrected. The results are valid above room temperature and reasonable agreement with experiment is obtained to within about 200 0 of the melting point. Comparison with experiment is also made for specific heats C v ' Cp and compressibilities I<T' I<s'
The Response of Closed Channels to Wind Stresses
Authors: Fitzgerald LM , Mansfield WW
Published: May 2011

The surface velocity, surface slope, and velocity profile produced by the application of a wind stress to the smooth surface of a closed channel have been determined by adapting the empirical laws of flow in smooth tubes. The estimated responses agree well with the available experimental data.
Transport Coefficients for Low Energy Electrons in Crossed Electric and Magnetic Fields
Authors: Jory RL
Published: May 2011

Experimental results are given for the ratio W xl W. of transverse to longitudinal drift velocity for electron swarms in nitrogen moving in crossed electric and magnetic fields. The results, obtained by Huxley's method, cover the range 0�04 < Elp < 8�0 V cm-1 torr-1 at 293�K. The apparatus and experimental procedures which have been developed permit accurate measurements to be made so that significant tests of the method have been possible over wide ranges of the experimental parameters. Information concerning the variation of the momentum transfer cross section with electron energy, and concerning the energy distribution function, can be obtained by comparing a quantity
Energy Level Spectra for 118Sn and 122Sn
Authors: Kumar N , Kumar V , Bhanot VB
Published: May 2011

Shell-model calculations have been made for the energy level spectra of 118Sn and 122Sn. Best fit with experimental data for 118Sn is found for singlet 8- and d-state orces of the same strength and range. Values for several unobserved levels of 122Sn have been predicted.
Two?Stream Instabilities in a Plasma
Authors: Kundu SK
Published: May 2011

A phenomenological scattering formula is used to investigate the effect of collision on the two�stream instabilities in a plasma of interstreaming electrons and ions. The result is that the enhanced Landau damping due to thermalized electron energy competes with the growth of the instability.
Equilibrium of a Pinch Discharge with a Transverse Rotating Magnetic Field
Authors: Blevin HA , Miller RB
Published: May 2011

The electron density distribution in a linear pinch discharge with a transverse rotating magnetic field is calculated for partially ionized plasmas. Numerical examples are given for distributions in the plasma with and without externally applied axial magnetic fields, and with different degrees of ionization.
Theoretical Models for the Radiance of Contaminant Glow Clouds in The Upper Atmosphere
Authors: Lloyd KH
Published: May 2011

A discussion is given of the time variation in radiance which would be observed across a diffusing glow cloud released in the upper atmosphere. A Gaussian distribution for the contaminant number density is used, and it is assumed that, when chemical reactions occur, either the contaminant density is everywhere very small, or an insignificant quantity of contaminant is consumed.
Magnetohydrodynamic Ionizing Shock Waves in a Conducting Medium
Authors: Green B , May RM
Published: May 2011

We present numerical calculations for the flow parameters (velocity, density, pressure, etc.) in a magnetohydrodynamic shock wave propagating in a conducting medium. The effect of ionization in the shock front is included. The results are presented graphically for a complete range of the initial magnetic field strength and direction, and for several arbitrary values of the ionization energy of the downstream fluid.
Polarization of 6 cm Radiation from the Crab Nebula
Authors: Gardner FF
Published: May 2011

Linear polarization measurements at 6 cm wavelength with the 21O-ft Parkes radio telescope have shown that the polarization of the Crab nebula is concentrated in an area under 2' in angular extent centered O~5�O~2 to the west and 1 ~ 1�O~2 to the south of the centre of the total emission.
The Reactions 6Li(g, d) and 7Li(g, t) Below 4 MeV
Authors: Dallimore PJ , Lam KS , Thies HH
Published: May 2011

In the present experiment the reactions 6Li(y, d) and 7Li(y, t) were investigated with bremsstrahlung from a linear accelerator by detecting the charged reaction products in coincidence with solid-state surface barrier detectors. II
The Upper Limiting Primary Rigidity of the Cosmic Ray Solar Anisotropy
Authors: Jacklyn RM , Humble JE
Published: May 2011

A method of determining the upper limiting rigidity of the solar diurnal variation of the cosmic ray primaries in free space is described. It involves a comparision of the response to the anisotropy of neutron monitors at sea level and of meson telescopes underground. Making use of the model for the free-space first harmonic proposed by Radio, McCracken, and Venkatesan, the annual average value for the upper limiting rigidity (Ru) in 1958 is estimated to have been 95 GV with an error of estimate of about 10-20 GV. Changes in the observed annual mean daily variation between 1958 and 1962 indicate that Ru may have decreased by about 20-40 GV over this period, but a more refined analysis is needed to confirm this.
Saint?Venant's Principle in Anisotropic Media
Authors: Noyes RB
Published: May 2011

Saint-Venant's principle may be stated (Sternberg 1954): "An equilibrated system of external forces applied to an elastic body, all of the points of application lying within a given sphere, produces deformations of negligible magnitude at distances from the sphere which are sufficiently large compared to its radius."
Remarks on the Paper by TR Visvanathan Entitled "On Bowen's Hypothesis"
Authors: Brier GW
Published: May 2011

Visvanathan's paper (1965) has reopened the controversial question of rainfall calendaricities that has stimulated so much research and discussion since the paper by Bowen (1953). Visvanathan's suggestion that anomalous rainfall at Sydney results from the joint effects associated with the lunar month and the calendar date is an interesting one, and depends upon the conclusion that the correlations between the curves of his Figures 2(b), 2(c), and 2(d) are significant. Although these curves are based on data that have been smoothed, thus introducing serial correlation into them, an appropriate significance test can be made which does in fact show that the conclusions are valid. However, his findings led the writer to examine the Sydney data from another point of view, and this investigation led to results giving a different interpretation from that given by Visvanathan.
A Symmetric Decomposition of the Two?Electron Wave Equation for Finite Nuclear Mass
Authors: Kalotas TM
Published: May 2011

As alternatives to the observed K~ ->- 271 decay we consider the processes (i) K~ -+ 271+Y and (ii) K~ -+ K~ magnetic conversion. It is shown that the former process is quite unlikely with the photon energy as suggested from experiment, while the second one is not so unlikely. Also suitable experiments are suggested to observe the processes considered here.
Charged Particle Motion in a Time?Dependent Axially Symmetric Magnetic Field
Authors: Seymour PW , Leipnik RB , Nicholson AF
Published: May 2011

Following a short review of the drift theory of plasma radial compression, an exact solution for the motion of a charged particle in an axially symmetric time-dependent magnetic field is� obtained. The method gives forms for the cylindrical coordinates rand B of the charged particle that have a simple interpretation, the z-motion being of constant velocity. As examples, the exact results are discussed for a simple power law and an exponential time dependence of the magnetic field and, using the latter results, the drift theory of plasma radial compression is qualitatively verified.
Stratospheric Temperatures Over Australia
Authors: Sparrow JG
Published: May 2011

A study of the stratospheric temperatures over Australia has revealed apparent anomalously high temperatures during 1963-64. Although a change in the radiosonde type was made near the beginning of this period, it is unlikely that this change can have introduced a discontinuity of the magnitude observed. It is tentatively proposed that the anomaly may be related either to the effects of the Bali volcanic debris which appeared over Australia during the same period or to a change in the nature of the biennial oscillation.
Identification of Extragalactic Radio Sources Between Declinations ?20° and ?44°
Authors: Bolton JG , E Clarke Margaret , Ekers RD
Published: May 2011

Identifications with extragalactic objects are suggested for 55 radio sources with declinations between _200 and _44�. The identifications are based on a search of the Palomar Sky Survey plates in the position of sources in the Parkes catalogue. Eight of the identifications are with suspected quasi-stellar objects and the remainder with galaxies. Finding charts are provided for the fainter obje~ts.
Effect of Gravitation in the Origin of Cosmic Particles
Authors: Durgapal MC , Gehlot GL
Published: May 2011

Following on Infeld's (1963) proposal of the dependence of the physical constants on the gravitational field, we apply this idea to quantum mechanics and other physical phenomena and suggest a possible explanation of the origin of cosmic rays.
Identification of Two Southern Quasi-stellar Objects
Authors: Ekers RD , Bolton JG
Published: May 2011

A number of possible quasi-stellar objects have been found from a search of the Palomar Sky Survey plates for identification of radio sources in the Parkes catalogue (Bolton, Clarke, and Ekers 1965). Confirmation of the identification of two of these sources, 1327-21 and 2115-30, has now been obtained from both precise position measurements and photoelectric observations. As quasi-stellar objects generally are of very small radio diameter, the optical positions can be used as primary calibration points for southern radio telescopes.
A Double Radio Source with a Wide Component Separation
Authors: Gardner FF , Bolton JG
Published: May 2011

Moffet (1964, 1965) has recently drawn attention to two double radio sources which have unusually large ratios of separation to component size. One of these, 3C 33, an interferometric double, has an angular separation of 250". and a component size of 16", giving a ratio of 16 : 1. The distance of the parent galaxy is such that the physical separation of the two components is at least 200 kpc. The other double consists of the sources 3C 343 and 3C 343�1 (revised Third Cambridge Catalogue
Fission Interference with Doppler Broadening
Authors: Cook JL
Published: May 2011

The multilevel interference term between two resonances of the same spin and parity is examined and transformed to an expression that allows the evaluation of the Doppler-broadened cross section in terms of known functions.
A Method of Correction for Unresolved Levels in Fissile Nuclei
Authors: Musgrove AR
Published: May 2011

A method of correcting for unresolved levels in fissile nuclei is described. The method is based on the distribution of the ratio of the reduced neutron width to the total width of a level. Calculations are carried out on three sets of data for 233U, and it is shown that approximately one-quarter of the resonance levels are undetected.
Excitation of Hydrogen and Ca II Under Chromospheric Conditions
Authors: Giovanelli RG
Published: May 2011

Methods are described for calculating excitation conditions in a hot gas in the absence of local thermodynamic equilibrium, taking self-absorption into account, in the approximation that excitation is uniform throughout the medium. The equilibrium excited-state populations and the emission, attenuation, and scattering properties derived from them are tabulated for a variety of physical conditions appropriate to the -solar chromosphere (7500 < T < 50000oK; 1010 < N e < 1012 cm-3) for some of the main spectral lines of hydrogen and CalI.
Suggested Identifications for Weak Extragalactic Radio Sources Between Declinations 0° and ?20°
Authors: Bolton JG , Ekers Jennifer
Published: May 2011

Sixty-eight identification" are suggested from inspection of the Palomar Sky Survey prints in the positions of 262 weak radio sources between declinations 0� and _20�. Forty-seven of the suggested identifications are galaxies and 21 possible quasi-stellar objects.
A Calculation of Sphere?Plane Fields with Applications to Dielectric Breakdown
Authors: Butler LA
Published: May 2011

The method of images is used to compute the field between a charged sphere and an earthed plane. From this field distribution the electrical conductivity of a sphere-plane system and also the temperature distribution during thermal breakdown are determined for ranges of geometrical and electrical parameters. Heat-sink efficiencies of the electrodes are included in the calculation, and an experimental method for assessing these is proposed.
Defocusing?Focusing Collision Sequences
Authors: Petersen MCE
Published: May 2011

A defocusing collision sequence with initial energy greater than the focusing energy can be converted into a focused collision sequence. This is demonstrated in the "hard sphere approximation" by taking account of the energy loss due to interaction with neighbouring lattice rows.
21 cm Observations of NGC 300
Authors: Shobbrook RR , Robinson BJ
Published: May 2011

The 210 ft radio telescope at Parkes has been used to determine the profiles of the 21 cm line from neutral hydrogen at about 100 points over the Sc galaxy NGC 300. The systemic velocity is + 145 km/sec, and the mass of neutral hydrogen is 2� 1 X 109 Mo. The total mass, determined from a rotation curve constructed from the velocities of the peaks of the profiles, is 2�5 X 1010 M 0' for an assumed distance of 1� 9 Mpc.
A High Resolution Study of the Distribution and Motions of Neutral Hydrogen in the Small Cloud of Magellan
Authors: Hindman JV
Published: May 2011

Observations of radiation from neutral hydrogen in the Small Cloud of Magellan at a wavelength of 21 em have been made using the 210 ft Parkes telescope and multichannel receiver. Profiles were observed over an area of 30 sq deg of sky.
The Two Components of the Radio Source W 49
Authors: Sato F , Akabane K , Kerr FJ
Published: May 2011

The radio source W 49 (3C 398), originally observed by Westerhout (1958), has two components.
A Search for OH Emission from the Magellanic Clouds
Authors: Radhakrishnan V
Published: May 2011

The rich variety and large number of HII regions in the Magellanic Clouds prompted a preliminary search for high-intensity anomalous OH emission similar to that observed in the direction of galactic HII regions (McGee et al. 1965; Weaver et al. 1965; Weinreb et al. 1965; Zuckerman, Lilley, and Penfield 1965). The two strongest emitters in the Galaxy are Sgr B2 and W 49, the distances to which are 10 and 15 kpc (Akabane and Kerr 1965) respectively. It was estimated that at the distance of the Magellanic Clouds the emission from Sgr B2 would be detectable and that from W 49 well above noise.
The Chapman?Enskog Solution of the Boltzmann Equation: A Reformulation in Terms of Irreducible Tensors and Matrices
Authors: Kumar Kallash
Published: May 2011

The Chapman-Enskog method of solving the Boltzmann equation is presented in a simpler and more efficient form. For this purpose all the operations involving the usual polynomials are carried out in spherical polar coordinates, and the Racah-Wigner methods of dealing with irreducible tensors are used throughout. The expressions for the collision integral and the associated bracket expressions of kinetic theory are derived in terms of Talmi coefficients, which have been extensively studied in the harmonic oscillator shell model of nuclear physics.
Diffuse Reflection and Transmission by Uniform Noncoherently Scattering Media
Authors: Black RBT
Published: May 2011

Diffusely reflected and transmitted spectral line profiles are calculated for uniform noncoherently scattering media onto which radiation of frequency near that of a resonance line of the medium is incident. Profiles are calculated for incident light that is either collimated or unifQrmly diffused and that is either monochromatic, or of uniform frequency distribution, or contains an absorption line centred on the resonance line under discussion. Spectral lines generated by uniformly excited media are also calculated.
The Clustering of Radio Sources
Authors: Payne AD
Published: May 2011

Two methods of analysis have been used in an investigation of the possible anisotropic distribution of radio sources listed in the Parkes catalogues. No significant evidence was found for clustering of sources on scales of 15' arc to 40�.
The Detection of a Non-stationary Signal in Noise
Authors: McNeil DR
Published: May 2011

Keen et al. (1965) have described the use of seismometer arrays for detecting earthquakes and underground atomic explosions. The purpose of the present paper is to investigate the merits of various correlation statistics based on the records from such an array.
Multipartiole Collisions. I. Angular Momentum Eigenstates
Authors: Cook JL
Published: May 2011

The current situation with regard to relativistic representation of multiparticle angular momentum eigenstates is reviewed and it is concluded that no generally satisfactory formalism exists. Difficulties with the formalism are outlined and a general method of construction of partial wave amplitudes is put forward.
Higher Modes of Non-Radial Oscillations of Stars by Variational Methods
Authors: Andrew AL
Published: May 2011

The Ritz method is applied to a variational principle of Chandrasekhar to determine the normal modes of non-radial oscillation of a massive star. Although good results are obtained for the f-mode and the p-modes, it is shown that the method may fail to detect the g-modes. The effect of the choice of coordinate functions is considered.
The Momentum Transfer Cross Section for Electrons in Helium
Authors: Crompton RW , Elford MT , Jory RL
Published: May 2011

Measurements of the drift velocity, the ratio of diffusion coefficient to mobility, and the "magnetic drift velocity" for electrons in helium have been made at 293�K in the range 1.8 X 10−19 E/N −17 V cm2. From an analysis of the drift velocity data, an energy-dependent momentum transfer cross section has been derived for which an error of less than � 2 % is claimed over the central portion of the energy range. The cross section agrees with the theoretical cross section of La Bahn and
Callaway to within 2% over the whole energy range. The agreement with the cross section derived by a number of procedures from the total elastic scattering cross section measured by Golden and Bandel is less satisfactory. The drift data are sufficiently accurate to enable a search to be made for the effects of fine structure in the cross section at low energy. The results do not support the existence of such structure.
Electron Densities and Scale Heights in the Mid-latitude Topside Ionosphere
Authors: Dyson PL
Published: May 2011

The diurnal and latitudinal variations of electron density and plasma scale height in the topside ionosphere during summer and winter have been calculated from Alouette I ionograms recorded at Woomera. The electron density behaviour is anomalous in that the winter night-time values are generally as large or larger than those occurring during the day. At heights near 1000 km the winter night-time values are greater than those for night-time summer. The behaviour of the scale height is very similar to that reported by others for the mid-latitude region of the northern hemisphere and implies that at night-time the transition level from 0+ to lighter ions occurs at heights of about 550 km in summer and 500 km in winter.
Oh Observations in the Directions of Galactic Thermal Sources
Authors: McGee RX , Gardner FF , Robinson BJ
Published: May 2011

A survey for the hydroxyl line radiation has been made in the directions of 30 radio sources (most of them thermal) with the 210 ft telescope of beamwidth 12'� 2 and the multichannel line receiver of bandwidths 10 and 37 kHz. The line at frequency 1665�401 MHz was observed for all sources and the other three lines at 1612, 1667, and 1720 MHz were observed for 10 of the more important sources. The latter were investigated for circular and linear polarization.
Low Frequency Absorption in Isotropic World Models
Authors: Payne AD
Published: May 2011

The present paper is concerned with the free�free absorption by intergalactic ionized hydrogen of the radiation from discrete radio sources. The absorption for different world models has been calculated as a function of redshift, electron density, and temperature.
Ionospheric Absorption Studies Based on Cosmic Noise Data at 28·6 MHz at Bangalore
Authors: Krishnamurthi M , Subrahmanya Sarma SBS
Published: May 2011

Using a. fa.irly narrow beam antenna (10��5 by 16��5), cosmic radio noise at 28�6 MHz has been continuously recorded during the years 1962-64. The data between midnight and 06 hr local time were used to determine the "unabsorbed cosmic noise intensity" for different sidereal times. Based on this, the total ionospheric absorption at this frequency was computed for the rest of the day. Diurnal and seasonal variations are discussed.
Topside Refractive Irregularities and Travelling Ionospheric Disturbances
Authors: Dyson PL
Published: May 2011

Munro (1950) deduced from ground-based observations that traveling ionospheric disturbances (T.LD.'s) are large-scale distortions of the electron density contours, which travel through the ionosphere, and Calvert and Schmid (1964) attributed extra traces and distortions of the main echo traces, which occur near the critical frequency of topside ionograms, to refractive effects associated with large-scale irregularities. In an examination of topside and sub-peak ionograms recorded close in position and time, it was found that on a number of occasions refractive effects occurred on topside ionograms, when manifestations of T.LD.'s were observed on sub-peak ionograms (Dyson 1967b).
Lattice Dynamics of Simple Harmonic and Anharmonic Shell Models
Authors: Oitmaa J
Published: May 2011

The lattice dynamics of harmonic and anharmonic shell models are reviewed. It is shown that the various dynamical equations for the shell model can be expressed in the same form as those for the rigid ion model, but with modified force constants. The anharmonic shell model leads to higher order contributions to the dipole moment, quadratic and cubic in the normal coordinates, for which explicit expressions are obtained.
Crystal Dislocations and Coercivity in Fine Grained Magnetite
Authors: Stacey FD , Wise KN
Published: May 2011

Interaction of the stress field of a favourably oriented edge dislocation with the magnetostriction in a ferromagnetic domain wall in magnetite causes the dislocation to act as a potential well for the domain wall. The coercivity of 20 pm. grains, in which the domain structure is considered to be particularly simple, can be explained on this basis if the dislocations are arranged so that the effects of several of them are additive. The required density of edge dislocations is 109 cm-2, which is entirely reasonable; screw dislocations are not effective in magnetite. To explain the variation of coercivity with grain size it appears necessary to assume that the arrangement of dislocations is neither regular nor random but is partially ordered.
Measurement of the Magnetic Drift Velocity and Magnetic Deflection Coefficient for Slow Electrons in Hydrogen and Deuterium at 293°K
Authors: Creaser RP
Published: May 2011

The magnetic drift velocity W M relating to the drift of an electron swarm in crossed electric and magnetic fields has been measured in hydrogen and uterium at 293�K. The measurements were made using Huxley's method of asuring Wx/W., the ratio of the transverse to the longitudinal drift velocity. Data re given for W M and for the magnetic deflection coefficient 'l' for 6�1 X 10-19 < E/N <2�7Xl0-16 Vcm2 for hydrogen and 6�1xl0-19 <E/N<2�4xl0-16 Vcm2for euterium.
The Computer Generation of Electron Microscope Pictures of Dislocations
Authors: Head AK
Published: May 2011

For objects like dislocations, sufficient information to define a picture can be obtained in 1 min of numerical integration of the Howie-Whelan differential equations describing image formation in the electron microscope. To match this computational speed, the computer line printer is used to print pictures using the half�tone principle. Examples are given, including comparisons with experimental pictures, and it is concluded that when the important information is in the topology of the picture, rather than in precise intensities, a pictorial presentation of the theoretical calculations is valuable.
Development of a Scale of Optical Radiation
Authors: Blevin WR , Brown WJ
Published: May 2011

A description is given of the development ab initio of a scale of optical radiation, in terms of which sources can be calibrated for radiant intensity and detectors for radiant sensitivity. The scale is considered to be accurate to within about �O�2%.
Further Spectral Observations of Grenade Glow Clouds in the Lower Thermosphere
Authors: Johnson ER , Low CH
Published: May 2011

The spectral energy distribution is given for the glow clouds resulting from the explosion of aluminized grenades in the range of altitude from 100 to 200 km. At night, over much of the spectral range from 300 to 800 nm, the spectrum is a continuum very similar to that of a black body at 4000-5000oK. At twilight, emissions resulting from resonant scattering of sunlight by AI, K, Ba, Na, and AIO are superimposed on, and dominate, the ontinuum.
Optical Positions of Bright Galaxies South of +200 Declination
Authors: Glanfield JR , Cameron MJ
Published: May 2011

To study the radio emission of bright galaxies, it has been found that their coordinates are needed with an accuracy considerably greater than that available from the NGC and IC catalogues. Their radio emission is usually weak and often intermingled with the emission of more distant radio galaxies and quasars. Unless a reasonably precise position is available it is not always possible to decide what proportion of any observed emission is associated with the galaxy. In the course of a series of observations with the Mills Cross radio telescope at the Molonglo Radio Observatory, it was necessary to remeasure the optical positions of the galaxies on the programme. These positions are likely to be of general use and are therefore presented separately from the results of the radio bservations.
Resonance Parameters for Uranium 233
Authors: de L Musgrove AR
Published: May 2011

Single-level and multilevel resonance parameters are given for 233U below 11 e V_ The total and fission cross sections were fitted simultaneously and good agreement was obtained. Spin assignments determined by the least squares method support the prediction of the channel theory of fission that 233U has two level populations; one with predominantly large fission widths and the other with much narrower widths.
A Study of the Polarization of Skylight
Authors: Gambling DJ , Billard B
Published: May 2011

Results of polarization observations of cloudless daylight skies over Salisbury South Australia, are presented. The measurements were made in a narrow wavelength range centred at 5450 A. When clear atmospheric conditions prevailed, the maximum degree of polarization was approximately O� 65, but this was observed to fall to 0�45 on an xceptionally hazy day.
Corner Conditions for Weak Shock Diffraction by a Wedge
Authors: de Mestre NJ
Published: May 2011

In deriving the first-order approximate solutions to the problem of the diffraction of a propagating pressure discontinuity by a rigid wedge in a non-viscous, non-thermally conducting, polytropic gas, Miles (1952) and Friedlander (1958) have taken as the comer conditions that the pressure remains finite and that the velocity may have an integrable singularity, whereas Keller and Blank (1951) gave no discussion of the comer conditions at all. Friedlander imposed the above-mentioned conditions in order to ensure the validity of the uniqueness theorem of the initial value problem for the wave equation, whereas Miles invoked them through physical requirements but gave no details.
The Drift Velocity of Electrons in Nitrogen
Authors: Blevin HA , Hasan MZ
Published: May 2011

In the previous communication (pp. 735-9 of the present issue) measurements of electron drift velocities in hydrogen were reported for E /p values in the range 12-50 V cm-l torrl at 20�C. These results were obtained using a modified form of the Bradbury-Nielsen shutter apparatus. This same drift tube has been used to determine electron drift velocities in nitrogen. Cylinder grade nitrogen was used and admitted to the system through liquid air traps.
Auroral Poles
Authors: Bond FR
Published: May 2011

The centred dipole geomagnetic poles and the eccentric dipole geomagnetic poles are established mathematical entities (Chapman and Bartels 1940). Here the related concept of the "auroral" poles is outlined. The relationship of the auroral pole to the maximum iso-aurore of the auroral zone as well as to the instantaneous auroral belt is indicated.
The Ground State of the (p?µ?p)+ Molecule Ion
Authors: Delves LM , Kalotas T
Published: May 2011

This paper gives the results of a variational calculation using a 100-term wavefunction on the ground (para) state of (P-I'-p)+, including the effects of the finite proton mass. The energy found is sensitive to the muon mass; with mil = 206�77 me, we find (B.E.)PIIP to be 253�14�0�01 eV. Results are also given for the muon-proton overlap, and for a number of other geometric averages of the wavefunction
The Akhieser?Pomeranchuk?Blair Model Analysis for Elastic Scattering of Deuterons
Authors: Rahman M , Khan AH , Sen Gupta HM
Published: May 2011

Angular distributions of deuterons elastically scattered from Mg, Fe, Cu, and Zn have been analysed in terms of the smoothed Akhieser-Pomeranchuk-Blair model and reasonable agreement was obtained in each case up to about 90�. The interaction radius R and the surface thickness f),.R were obtained from the best-fit parameter values.
Calculation of Surface Energy as a Function of Orientation for Cubic Crystals
Authors: Nicholas JF
Published: May 2011

The surface energies of face�centred and body. centred cubic crystals have been calculated on the assumption that the atoms interact with pairwise potentials of either Morse or Mie type. The calculations take into account interactions between all neighbours and have been carried through for about 50 crystallographically distinct orientations of the surface. No allowance has been made for relaxation of the surface atoms. Stereographic contour plots of the surface energy are presented for four Morse and six Mie potentials in each structure. It is shown that, for all these potentials, a good approximation to the results can be obtained by counting only the numbers of nearest and next-nearest neighbour bonds that are broken and associating empirically determined energies with each of these.
Electromagnetic Diffraction by a Plane Slit Aperture
Authors: Tan HS
Published: May 2011

An asymptotic solution of the integral equations for diffraction by an E-polarized slit aperture is given. The results for the diffracted field are in excellent agreement with the exact solution and compare favourably with the results given by other approximate solutions.
Electron Transport Coefficients in Hydrogen and Deuterium
Authors: Crompton RW , Elford MT , McIntosh AI
Published: May 2011

Measurements have been made of the drift velocity W and the ratio of diffusion coefficient to mobility D/μ for low energy electrons in deuterium at 77�K, and of D/μ in hydrogen at 77 and 293�K. Tabulated data are given for D/μ within the range 2 x 10−20 ≤ E/N ≤ 1.2 x 10−16 V cm2 and for W within the range 8 x 10−20 ≤ E/N ≤ 9.5 x 10−17 V cm2. The low temperature results show a considerably reduced scatter when oompared with previously published data and are of an aocuracy comparable with the results of recent measurements made at room temperature. The data obtained complement those of Lowke and of McIntosh thus completing a set from which a more acourate determination of low energy elastic and inelastic cross sections can be made.
Accurate Positions of 210 Radio Sources
Authors: Shimmins AJ
Published: May 2011

The right ascensions and declinations of 210 radio sources have been determined. For most of the sources the estimated error is less than 16N arc in each coordinate. The sources were selected from the Parkes catalogue of radio sources and are between declinations +27� and -33�.
Identification of Radio Sources Between Declinations +27° and ?30°
Authors: Bolton JG , Shimmins AJ , Merkelijn Jeannette
Published: May 2011

Seventy-four identifications have been made from inspection of the 48 in. Sky Survey prints in positions of 150 sources measured with the 210 ft telescope. Thirty-seven of the identified sources are galaxies and 37 possible quasi-stellar objects. In 26 cases previously suggested identifications are confirmed. Finding charts are given for the remainder
Observations of 31 Radio Sources Between 40 and 130 MHz
Authors: Haynes RF , Hamilton PA
Published: May 2011

Recent observations of 31 radio sources in the frequency range 40-130 MHz obtained at the Australian National Radio Astronomy Observatory, Parkes, N.S.W., are reported in this paper. The results obtained show that some useful information about source emission mechanisms may be deduced
High Resolution Observations of the Orion Nebula at 408 MHz
Authors: Mills BY , Shaver PA
Published: May 2011

The Orion Nebula has been observed at 408 MHz with the 1 mile Cross radio telescope at the Molonglo Radio Observatory. NGC 1976 and NGC 1982 were observed separately and the former was well resolved.. Comparison with high frequency results shows that the central region is opti('ally thick; the electron temperature was measured directly at 7 6000K � 800 degK. Both nebulae are strongly concentrated towards their exciting stars..
Angular Distributions in the Giant Resonance of 16O
Authors: Stewart RJJ
Published: May 2011

The 16O( y, Po)l6N reaction has been studied in the region of excitation in 160 from 20�5 to 25�6 MeV. Angular distributions on the resonances observed were extracted from the spectra, which were taken at 20� intervals from 30� to 150�. The results are compared with other related- work.
Trial of a Numerical Method for Solving the Schrödinger Wave Equation in Several Variables
Authors: Bassett IM
Published: May 2011

A numerical method previously described for the solution of eigenvalueeigenfunction problems in several variables has been applied to the Schrodinger wave equation for the lithium atom. The method employs an expansion of the wavefunction in terms of Slater determinants. Some information is obtained about the convergence behaviour of such expansions, the convergence being too slow in this instance to yield an energy of useful accuracy
A Survey of the Galactic Plane at 85 and 150 MHz
Authors: Wielebinski R , Smith DH , Garzón Cárdenas X
Published: May 2011

A survey has been made of the intense emission regions along the galactic plane from l = 600 to 2900 at frequencies of 85 and 150 MHz with the 210 ft radio telescope at Parkes. Aerial temperatures were accurately measured, essentially in terms of thermal standards, with a known baselevel. The spectrum and "steps" of the observed emission have been investigated.
Radio Emission of 158 Galaxies
Authors: Tovmassian HM
Published: May 2011

Radio observations of Hi8 mainly spiral galaxies have been made at 21 em and additional observations have been made for some at 11 and 75 em. The observations at 11 and 21 cm were made with the CSIR<z 210 ft radio telescope at Parkes and those at 75 cm with the east-west arm of the Mills Cross at the Molonglo Observatory of the University of Sydney. Radio emission was detected from central regions of 20 of the galaxies.
Radio Emission from the Supernova Remnant Vela-X
Authors: Milne DK
Published: May 2011

Radio observations are presented of the fairly large galactic complex Vela-X, Y, and Z. These sources are believed to be the remnant of a supernova having an optical identification with the filamentary nebula Stromlo 16. The brightness distributions, obtained at four frequencies, indicate an open annular structure reminiscent of other supernova remnants. The variation of spectral index over the region is investigated and shows that the radiation is substantially nontherm81, the integrated fluxes yielding a spectral index of -0,3. A high resolution distribution of magnetic field direction is deduced from polarization measurements made at three frequencies; a circumferential magnetic field is a possible interpretation of the field orientations.
Accurate Right Ascensions of Selected Southern Radio Sources
Authors: Sutton JM
Published: May 2011

Right ascensions of selected radio sources were measured using the east-west arm of the Molonglo radio telescope. A calibration curve was obtained by surveying the aerial structure and site, and by observing radio sources with accurately known positions. Right ascensions are given for 58 sources stronger than 5 f.u. at 408 MHz and in the declination range + 19� to - 90�. The standard errors are typically 2".
0+ States of 8Be
Authors: Barker FC , Hay HJ , Treacy PB
Published: May 2011

The light even nuclei with A ;;;. 10 have 0+ excited states near 6 MeV, probably with large (X-particle reduced widths. A similar state in BBe would be very broad. Evidence for 0+ excited states in BBe has been obtained here using many-level R-matrix fits to known (X-(X scattering data, but the excitation energies depend strongly on the assumed channel radius. For a simultaneous fit to the 9Be(p, d)BBe cross section, assuming these higher states are not strongly populated, the channel radius is restricted to (7~~) fm, implying a 0+ excited state at (6=f3) MeV of width (9=f4) MeV.
The Ray Theory of Doppler Frequency Shifts
Authors: Bennett JA
Published: May 2011

A general expression is obtained according to ray theory for the Doppler frequency shift observed when both receiver and transmitter are in motion in a time-varying anisotropic but lossless medium. The result is obtained using Hamilton's optical method. The range of application of the resulting expression and its relationship to a number of published results are considered. The method of analysis is also applied to the calculation of the group path of a radio wave.
Finite Sample Correlations of Quantized Gaussians
Authors: Cole T
Published: May 2011

A theory is developed for the treatment of quantized signals and for the estimate of correlation from quantized signals of only finite length. Different quantization systems can be compared on the accuracy of estimation of correlation for the same record length. For Gaussian statistics it is shown that with low values of correlation the efficiencies of one, two, and three bit quantizations are respectively 64, 89, and 95% with respect to continuous multiplication. For highly correlated signals the one bit system becomes the most efficient
Structure of Polytropes with Purely Toroidal Magnetic Fields
Authors: K Sinha Narendra
Published: May 2011

In this paper the influence of a purely toroidal magnetic field upon the structure of a poly trope is investigated and the first. order perturbations in the density distribution, the geometry of the boundary, and the mass-radius relation are obtained
Directional Correlation of Gamma Rays in the Decay of 2·3 d 115Cd
Authors: Bajaj MM , Gupta SL , Saha NK
Published: May 2011

The gamma-gamma directional correlation of the 35-493 keY cascade in the decay of 2�3 d 116Cd has been studied by the coincidence method. The results seem to favour the spin and parity assignments 1/.+, 3/.+, and 1/.- for the levels at 864, 829, and 336 keY respectively, and indicate that the 35 keY transition is (96�5�0�5)% Ml and (3�5�0�5)% E2, with a mixing parameter 8 = -0�191� 0�014. These results agree with the recent I.C.C. measurements of Backlin, Fogelberg, and Malmskog but differ from those of earlier work. Computation of the partial lifetimes of the 35 keY radiation on this basis indicates that the Ml transition is retarded by a factor of ~ 23 and the E2 transition is enhanced by a factor of ~ 958. The E 1 component of 493 ke V radiation is estimated to be hindered by a factor of ~ 4 X 10-7, while the M2 component is retarded by a factor of ~ 3. The possible collective nature of the 829 keY level is discussed.
Computed Electron Micrographs for Tilted Foils Containing Dislocations and Stacking Faults
Authors: Humble P
Published: May 2011

The method of computation of electron microscope images developed by Head (1967) produces micrographs of single dislocations in about 1 min of numerical integration. In Head's original programme, the electron beam direction and the normal to the foil surface are coincident. Since this condition is not often realized in practical electron microscopy, the programme has been extended to compute the images of dislocations in tilted foils. It has been further modified to compute he images from a configuration 'containing up to two dislocations and up to three stacking faults. These programmes are thus applica.ble to a wide range of defect con� figurations in tilted thin foils. The derivation of these programmes is described and several examples of their- use in experimental situations are given. These include the "skewing" of dislocation images due to the noncoincidence of the beam direction and the foil normal, and images due to interactions between dislocations and stacking faults.
The Linear Polarization of Radiation from Jupiter at 6 cm Wavelength
Authors: Morris D , Whiteoak JB , Tonking F
Published: May 2011

At a wavelength of 6 cm the degree of linear polarization of the radiation from Jupiter is 0�076�0�002. The variation of the direction of polarization with longitude of the central meridian is consistent with the increased period of rotation determined by Komesaroff and McCulloch (1967). There is evidence of an asymmetricl beaming of the nonthermal radiation with longitude in addition to the latitude asymmetry that was detected previously by Roberts and Komesaroff (1965). The mean flux density normalized to a distance of 4�04 a.u. is 1O�7�0�2 f.u. The small nonthermal contribution (3'7 f.u.) is further evidence for a high frequency cutoff in the synchrotron radiation; the thermal component corresponds to a brightness temperature of about 250oK.
A Catalogue of Galactic Radio Sources
Authors: Kesteven MJL
Published: May 2011

The results of a survey of radio sources in the galactic plane in the longitude range 1800 to 400 with the 1 mile Molonglo Cross telescope at 408 MHz are presented. The methods of observation and reduction are described briefly. The catalogue lists the position, flux density, size, and spectral index for 80 sources
R-Matrix Fit to 9Be(g, n)8Be Cross Section Near Threshold
Authors: Barker FC , Fitzpatrick BM
Published: May 2011

Satisfactory fits to the 9Be( y, n)8Be cross section just above the neutron threshold are obtained with the one�level approximation of R�matrix theory but not with that of complex eigenvalue theory. Restrictions on the R�matrix parameters from other sources are discussed.
The Behaviour of DWBA Stripping Amplitudes near the Butler Pole
Authors: Andrews M , Bertram WK , Tassie LJ
Published: May 2011

Using integral representations of the� bOtuld state wave functions it is shown that, near the so�called Butler pole, DWBA amplitudes of (d, p) and certain (d, n) reactions depend only on the asymptotic parts of these wave ftulctions. Furthermore, the zero-range approximation for the n-p interaction in the deuteron is exact at the pole. As well it is fotuld that for (d, n) stripping to loosely bound levels of heavy nuclei the Butler pole disappears in the sense that the amplitude is no longer infinite there.
Nonlinear Adiabatic Pulsations of Massive Stars
Authors: Murphy JO
Published: May 2011

The pulsational properties of a sequence of massive stars have been investi� gated in this paper. The second� order approximation to the equation of motion governing the adiabatic radial oscillations of these stars has been determined allowing for the variation of the radiation pressure throughout the star. In each case the form of the radial velocity curve at the surface of the star has been established taking into account the influence of higher modes of oscillation.