scholarly journals New Radio Observations Of ‘Old Faithful’

1996 ◽  
Vol 173 ◽  
pp. 349-350 ◽  
Author(s):  
R.W. Porcas ◽  
A.R. Patnaik ◽  
T.W.B. Muxlow ◽  
M.A. Garrett ◽  
D. Walsh
Keyword(s):  
Mass Distribution ◽  
Position Angle ◽  
Gravitational Lens ◽  
List Type ◽  
Type Number ◽  
Lens System ◽  
The West ◽  
Optical Images ◽  
New Radio ◽  
Made In

We present new arcsecond-scale radio images of the gravitational lens system 0957+561 A, B. Observations at 1.6GHz were made in 1991 October with the VLA in A/B configuration with a resolution of 1.5 arcsec (Fig. 1, left). The lowest contour is 0.37 mJy/beam. In addition to the compact A and B image components, and the familiar NE/SW radio double-lobe structure surrounding image A, this map shows two interesting new features: (a)a long, thin feature extending south and west from the NE lobe, some 10 arcsec in extent, confirming the detection by Avruch et al. (1994). It is reminiscent of the ‘arc’ features seen in optical images of lensing clusters, and hopefully can be used to constrain models of the cluster mass distribution. (For the superstitious, one can note that the position angle of the arc, 17°, is identical to that of the VLBI jet in image B, a few arcseconds to the west.)(b)a low-level extension of the B image in the NW direction. We are not aware that this has been seen before. A possible interpretation of this feature is a continuation of the jet emission seen in VLBI images of B, whose counterpart in A is seen in higher resolution maps. The change of position angle between the VLBI and arcsec-scale jets would indeed have opposite parities in the A and B images.

The Man in the Background: The Search for Maecenas

Antichthon ◽  
2020 ◽  
Vol 54 ◽  
pp. 54-79
Author(s):  
Ronald T. Ridley
Keyword(s):  
Sixteenth Century ◽  
Current Understanding ◽  
List Type ◽  
Type Number ◽  
Large Role ◽  
Mistaken Identity ◽  
Augustan Era ◽  
Ara Pacis ◽  
Made In

AbstractSince the late sixteenth century parts of the ‘imperial frieze’ of the Ara Pacis have been known. The most striking figure in the background of the southern frieze is that long thought to be a portrait of Maecenas, the Etruscan prince and literary patron of the Augustan era. This article attempts three things: to discover 1.Where and how this identification originated,2.What evidence there now is for that identification, and3.What alternative identifications can be offered.The bibliography is substantial, the trail is complicated and highly paradoxical, and fantasy has often played a large role. The ‘evidence’ in play for centuries has sometimes evaporated into thin air. The identities proposed are, in fact, numerous. Not of least interest is the hidden or mistaken identity, in turn, of crucial modern scholars. A method is proposed at last for evaluating the identifications of this background portrait, including obvious comparison with other background figures. This analysis emphasizes how much is still not known about the most famous piece of Augustan art. An attempt is nevertheless made in the last analysis, to support what can be offered, in the light of current understanding, as the most plausible identification.

scholarly journals Can We Measure H0 with VLBI Observations of Gravitational Images?

1988 ◽  
Vol 129 ◽  
pp. 207-208
Author(s):  
E. E. Falco ◽  
M. V. Gorenstein ◽  
I. I. Shapiro
Keyword(s):  
Time Delay ◽  
Mass Distribution ◽  
Velocity Dispersion ◽  
Gravitational Lens ◽  
Lens System ◽  
Relative Time ◽  
Surface Mass ◽  
A Value ◽  
Vlbi Observations ◽  
The Difference

We have used the relative positions and magnifications of the A and B images in the gravitational lens system 0957+561, obtained from VLBI observations, to constrain a model for the surface mass distribution of the lens. With measurements of the difference ΔτBA in propagation times associated with A and B (the “relative time delay”) and of the velocity dispersion of the main lensing galaxy, both to be obtained, our model will yield a value for H0 with an uncertainty of ∼ 20% due mainly to uncertainties in our assumptions.

The Influence of the West German Constitution on the Legal System of the Country

1989 ◽  
Vol 17 (2) ◽  
pp. 111-122
Author(s):  
Juergen Christoph Goedan
Keyword(s):  
Human Rights ◽  
Legal System ◽  
List Type ◽  
Federal Republic Of Germany ◽  
Type Number ◽  
The West ◽  
Basic Law ◽  
The World ◽  
German Constitution ◽  
German People

Article 1 of the Basic Law the Constitution of the Federal Republic of Germany, reads as follow: “(1)The dignity of man shall be inviolable. To respect and protect it shall be the duty of all state authority.(2)The German people therefore acknowledge inviolable and inalienable human rights as the basis of every community, of peace and of justice in the world.(3)The following basic rights shall bind the legislature, the executive and the judiciary as directly enforceable law.”This article answers, in a nutshell, all the questions one might raise regarding the influence of a constitution on the legal system of a country.

Hitachi Scanning Electron Microscope

1968 ◽  
Vol 26 ◽  
pp. 374-375
Author(s):  
T. Fujiyasu ◽  
K. Hara ◽  
H. Tamura
Keyword(s):  
Optical Axis ◽  
Electrical Potential ◽  
Objective Lens ◽  
List Type ◽  
Type Number ◽  
Lens System ◽  
Mechanical Vibrations ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Scanning Electron

The demand for scanning electron microscopes is growing rapidly and exciting new fields of application have developed for this type of instrument. Hitachi, Ltd. has developed this type of instrument the details of which are described in this paper.A three stage demagnification lens system is used in the instrument. External magnetic and electrical disturbances and mechanical vibrations have been reduced.Aperture plates with different bore diameters are located above the condenser lens and deflection coil and the objective lens to reduce contamination by the fixed apertures in these lenses. An electromagnetic stigmator is provided in the objective lens field.The specimen stage permits X-, Y- and Z- axes movements as well as rotational tilting. The rotational tilting is such that its central axis is always coincident with the optical axis independent of the X-, Y- and Z- axes movements. Terminals are also provided which permit voltage measurements and to observe the electrical potential distribution of semi conductors.

Hitachi Model XMA-5 Electron Probe Microanalyzer

1968 ◽  
Vol 26 ◽  
pp. 308-309
Author(s):  
Tomura ◽  
Okano ◽  
Hara
Keyword(s):  
Electron Probe ◽  
High Performance ◽  
List Type ◽  
X Rays ◽  
Type Number ◽  
Fluorescence Excitation ◽  
X Ray ◽  
Electron Probe Microanalyzer ◽  
Scientific Instrumentation ◽  
Made In

The recent advancement in scientific instrumentation has been phenomenal. This is particularity true in the electron probe microanalyzer field. This paper describes the improvements made in the Hitachi Model XMA-5 Electron Probe Microanalyzer to achieve high performance.1.X-ray spectroscopy1-1.It is now possible to analyze a wide variety of elements including ultra light elements in minute concentrations with the advent of an increasing number of dispersing elements and high detectability.1-2.A linear crystal drive and direct wavelength read-out (with respect to the crystal) is employed in the spectrometer to assure simultaneous analyses of up to three elements by using three of the six crystals provided. For correction of absorbed X-rays and fluorescence excitation and with due consideration of the angular distribution of the characteristic X-rays, an X-ray take off angle of 38° (electron probe is incident vertically on the specimen surface) was adopted.

scholarly journals Polarization Variability of Some Compact Radio Sources

1982 ◽  
Vol 97 ◽  
pp. 331-333
Author(s):  
M. M. Komesaroff ◽  
D. K. Milne ◽  
P. T. Rayner ◽  
J. A. Roberts ◽  
D. J. Cooke
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Position Angle ◽  
Linear Increase ◽  
Monitoring Programme ◽  
Radio Sources ◽  
List Type ◽  
Type Number ◽  
5 Ghz ◽  
Superluminal Expansion

Figure 1 shows observations for four sample sources from the Parkes 5 GHz polarization monitoring programme. Interesting features illustrated include •Sudden changes of the position angle of the linear polarization by ≳ 70° in PKS 0537-441 and 1253-055 (3C279).•A linear increase in the position angle of the polarization of PKS 2134+004 through 70° over 3/12; years.•Distinct bursts of circular polarization in PKS 0430+052, 0537-441 and 1253-055. In PKS 0430+052 (3C120) such a burst coincides with the possible superluminal expansion (Walker et al., 1981). In PKS 1253-055 (3C279) a burst of circular polarization is currently occurring at a time of very low linear polarization.

scholarly journals A VLBA 15 GHz Small Separation Gravitational Lens Survey

1996 ◽  
Vol 173 ◽  
pp. 405-406
Author(s):  
A.R. Patnaik ◽  
M.A. Garrett ◽  
A. Polatidis ◽  
D. Bagri
Keyword(s):  
High Frequency ◽  
Gravitational Lens ◽  
Radio Sources ◽  
List Type ◽  
Type Number ◽  
Morphological Classification ◽  
Small Separation

We have embarked on a 15 GHz VLBA survey of 1000 flat spectrum sources. We present the results from a 24 hour pilot observing run in which 72 sources were mapped. The primary aims of this project are: –to search for small separation (1-150 mas) gravitational lens systems–to identify targets for current mm and anticipated Space VLBI programs–a morphological classification of compact radio sources at relatively high frequency with sub-mas resolution.

Psychiatry and the Report of the Royal Commission

1928 ◽  
Vol 74 (304) ◽  
pp. 35-49 ◽  
Author(s):  
R. Langdon-Down
Keyword(s):  
Mental Disorder ◽  
Royal Commission ◽  
List Type ◽  
Type Number ◽  
England And Wales ◽  
Set Up ◽  
Made In

The Royal Commission on Lunacy and Mental Disorder was set up in July, 1924, to inquire into a matter of urgent public importance, that is to say: (1)The existing law and administrative machinery in England and Wales in connection with the certification, detention and care of persons who are, or who are alleged to be, of unsound mind.(2)The extent to which provision is or should be made in England and Wales for the treatment without certification of persons suffering from mental disorder and to make recom mendations.

scholarly journals Arizona Radiocarbon Dates VII

Radiocarbon ◽  
1967 ◽  
Vol 9 ◽  
pp. 1-14 ◽  
Author(s):  
C. Vance Haynes ◽  
Donald C. Grey ◽  
Paul E. Damon ◽  
Richmond Bennett
Keyword(s):  
List Type ◽  
Type Number ◽  
Radiocarbon Dates ◽  
Made In

The C14 measurements reported here were made in this laboratory between November 15, 1965 and June 15, 1966. Sample descriptions are classified as follows: I.Geochemical SamplesII.Geologic-Paleoclimatic SamplesIII.Early Man-Alluvial Stratigraphy SamplesIV.Archaeologic Samples

scholarly journals Dynamical interpretations of the galactic center region

1979 ◽  
Vol 84 ◽  
pp. 383-392 ◽  
Author(s):  
Robert H. Sanders
Keyword(s):  
Mass Distribution ◽  
Central Region ◽  
Galactic Center ◽  
List Type ◽  
Type Number ◽  
Center Region ◽  
The Galaxy

I will define the central region of the Galaxy as being the inner four kiloparsecs. The distinguishing characteristics of this region are: 1)The dominance of a central spheroidal component in the mass distribution – a bulge.2)An apparent deficiency of gas, at least between radii of 500 pc and 4000 pc.3)High non-circular gas velocities. Now let us consider these characteristics in some detail.

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