A Preliminary Survey of Radio Sources in a Limited Region of the Sky at a Wavelength of 3·5 m

1957 ◽  
Vol 10 (1) ◽  
pp. 162 ◽  
Author(s):  
BY Mills ◽  
OB Slee
Keyword(s):  
Statistical Analysis ◽  
Major Part ◽  
Significant Degree ◽  
Radio Interferometer ◽  
Radio Sources ◽  
Preliminary Survey ◽  
Instrumental Effects ◽  
Limited Region ◽  
Sample Area ◽  
Celestial Equator

A preliminary catalogue has been prepared of radio sources observed in a sample area of about one steradian near the celestial equator: a total of 383 sources is listed. The brightest nebulae in the area are found to be radio sources. Statistical analysis of the catalogue reveals no obvious cosmological effects except, perhaps, for a significant degree of clustering which may be indicative of metagalactic structure. The catalogue is compared in detail with a recent Cambridge catalogue which includes the sample area; it is found that they are almost completely discordant. A theory is developed which explains this discordance in terms of instrumental effects and it is concluded that a major part of the Cambridge catalogue is affected by the low resolution of their radio interferometer.

Economic Factors in Catch Fluctuations

1955 ◽  
Vol 12 (1) ◽  
pp. 85-92
Author(s):  
H. Scott Gordon
Keyword(s):  
Statistical Analysis ◽  
Major Part ◽  
Economic Factors ◽  
Pacific Herring ◽  
Atlantic Herring ◽  
Pacific Halibut ◽  
Correlation Methods ◽  
Commercial Species

Correlation methods were employed in a statistical analysis of the relation between catch fluctuations and economic factors for the principal Canadian commercial species of the Atlantic and Pacific coasts. The results indicate that the major part of catch fluctuations are ascribable to economic factors in the cases of Atlantic herring, "sardines", and cod (tentative), and Pacific herring. Economic factors appear to have had no significant effect on the catches of Atlanta lobsters and Pacific halibut and salmon.

A NEW ESTIMATE OF THE DENSITY AND INTENSITY OF EXTRAGALACTIC RADIO SOURCES

1963 ◽  
Vol 41 (5) ◽  
pp. 737-741
Author(s):  
G. A. Harrower ◽  
M. J. Watson
Keyword(s):  
Steady State ◽  
Statistical Analysis ◽  
Intensity Factor ◽  
Theoretical Curve ◽  
Radio Sources ◽  
Cosmic Radio ◽  
Factor B ◽  
Steady State Analysis ◽  
Extragalactic Radio Sources ◽  
Best Fit

The recent availability, through a statistical analysis of the Cambridge measurements of cosmic radio sources, of a source-count curve extended to distances at which the effect of recessional velocity is clearly evident in the measurements, has prompted the following comparison of this measured source-count curve with a theoretical curve based on a steady-state analysis. A best fit of measurements and theory allows values of proper density of sources ρ0 and intensity factor b to be estimated independently. The results obtained are ρ0 = 35 × 10−74 sources per cubic meter and b = 11 × 1025 (MKS units).

scholarly journals A multiwavelength study of a sample of Texas Radio Survey steep spectrum sources

2006 ◽  
Vol 2 (14) ◽  
pp. 610-610
Author(s):  
Ray A. Lucas ◽  
Neal Miller ◽  
Anton M. Koekemoer ◽  
Jeffrey Van Duyne ◽  
Kenneth C. Chambers
Keyword(s):  
Radio Interferometer ◽  
Radio Sources ◽  
Complete Sample ◽  
Spectrum Radio ◽  
Radio Survey

VLA A-array snapshots were obtained of a complete sample of steep-spectrum radio sources from the Texas Radio Interferometer survey. Though similar in sensitivity to the FIRST Survey, our A-array snapshots have better resolution, and are complementary to FIRST. All initial A-array maps are made, and we are comparing them to FIRST.

scholarly journals A Catalogue of Radio Sources Between Declinations ?50° and ?80°

1961 ◽  
Vol 14 (4) ◽  
pp. 497 ◽  
Author(s):  
BY Mills ◽  
OB Slee ◽  
ER Hill
Keyword(s):  
Statistical Analysis ◽  
Radio Telescope ◽  
Small Area ◽  
Radio Sources ◽  
Low Weight ◽  
Cross Type

A catalogue has been prepared of the radio sources observed between declinations -50� and -80�, using the Sydney cross-type radio telescope at a wavelength of 3�5 m; a total of 219 sources is listed. This supplements the earlier catalogues for the declination ranges +10� to -20� and -20� to -50�. In addition to the positions and intensities of the sources, angular sizes of 42 of the strongest sources are given. As before, identifications with bright optical objects have been sought, and a number of possible identifications with emission nebulae and bright galaxies are listed. Because of the small area of sky covered by the present catalogue, the numbers of sources are small (compared with those in our earlier catalogues) so that the statistical analysis of their distribution has comparatively low weight.

scholarly journals Studi Variasi Ubi Jalar (Ipomoea Batatas L) Berdasarkan Karakter Morfologi di Kabupaten Ngawi

2018 ◽  
Vol 5 (2) ◽  
pp. 78 ◽  
Author(s):  
Karlina Purbasari ◽  
Angga Rahabistara Sumadji
Keyword(s):  
Statistical Analysis ◽  
Ipomoea Batatas ◽  
Significant Degree ◽  
Skin Colour ◽  
Storage Root ◽  
Storage Roots ◽  
Sweet Potatoes ◽  
Flesh Colour ◽  
Environment Factors ◽  
Morphological Distinction

<p class="E-JOURNALAbstractBodyEnglish"><span>Sweet potatoes were potential plants in food diversification for rice substitution</span><span lang="IN">.</span><span> The plants could be found in some areas in Indonesia, such as in Ngawi Regency. The research aimed to find out the variation and morphological distinction in sweet potatoes in Ngawi Regency. The samples were taken randomly in Kedunggalar, Jogorogo, and Bringin Subdistrict. The sweet potatoes were tested with ANAVA and DMRT, Kruskal-Wallis and U-Mann Whitney with significant degree was 5%. There were variation in morphological leaves, storage root, and stems from the eight samples taken. Statistical analysis showed there were vivid distinction in the shape of the leaves, the lobes type, the central lobes, the petiole pigmentation, the colour of stems, the immature leaves colour, the storage roots shape, the dominant skin colour, the dominant flesh colour, and distribution of secondary flesh colour of anthosianine pigment. The variation among sweet potatoes were affected by genetic/ variety distinction and environment factors. </span></p>

The study of variability in some wool traits in a coarse wool breed of sheep

1973 ◽  
Vol 80 (2) ◽  
pp. 233-238 ◽  
Author(s):  
R. A. Guirgis
Keyword(s):  
Statistical Analysis ◽  
Standard Deviation ◽  
Major Part ◽  
Fibre Diameter ◽  
Coefficient Of Determination ◽  
Main Contributor ◽  
Total Variability ◽  
The Mean ◽  
Staple Length

SummaryWool samples from 47 Barki yearlings were taken from five positions during two years to study the variability in the fleece, the cause of variability and associations between different fleece traits. Statistical analysis has indicated the following significant points.An antero-posterior gradient occurred in the different traits under study. When medullation was discarded, though it was of a low magnitude (3·9%), a reduction of 5·89% in the mean fibre diameter and of 18·33% in its standard deviation occurred.The position most representative of the whole fleece varied with the trait. It is recommended to take three sampling positions forming a triangle, withers, mid-side and hip, to represent the Barki fleece.The animals contributed the major part in the variability of mean fibre diameter (1), the standard deviation of fibre diameter (S.D.1), percentage medullation, mean fibre diameter after discarding the medullated fibres (2), the standard deviation of fibre diameter after discarding the medullated fibres (S.D.2), the contribution of medullation to the total variability, percentage fine fibres and percentage coarse fibres. The positions were the main contributor to the variability of percentage kemp fibres, staple length, medullation index and to a certain extent to that of the kemp score. The year played a significant part in the variability except for 2 and S.D.2.The highest correlations with the standard deviation of fibre diameter were those of percentage medullation and kemp score. These three variables when considered separately accounted for 0·47, 0·35 and 0·31 respectively of the variability in S.D.Equations were obtained to predict the standard deviation from both the mean fibre diameter and the percentage medullation and to predict the mean fibre diameter from the staple length and the kemp score. The coefficient of determination of the first set of equations ranged from 0·47 to 0·56 while that of the second set ranged between 0·07 and 0·51 for different positions.

scholarly journals Statistical Analysis of Observations of a Complete Sample of Compact Extragalactic Radio Sources

1996 ◽  
Vol 175 ◽  
pp. 97-98
Author(s):  
Y.Y. Kovalev
Keyword(s):  
Statistical Analysis ◽  
Radio Sources ◽  
Statistical Distributions ◽  
Turnover Frequency ◽  
Complete Sample ◽  
Extragalactic Radio Sources ◽  
Bl Lacs

Here are analyzed the results of instantaneous multifrequency observations for a complete sample of 113 extragalactic radio sources (see the paper by Yu.A. Kovalev et al. in these Proceedings) with declinations −30° ÷ 43° from the VLBI–survey. It is tested the hypothesis that quasars and BL Lacs have different nature. Statistical distributions for the turnover flux, turnover frequency, spectral indexes, and other parameters are analyzed.

scholarly journals The Statistical Analysis of Anisotropies

1977 ◽  
Vol 74 ◽  
pp. 75-81
Author(s):  
Adrian Webster
Keyword(s):  
Statistical Analysis ◽  
Statistical Method ◽  
Point Processes ◽  
Radio Sources ◽  
The Many ◽  
Celestial Sphere ◽  
Radio Survey

One of the many uses to which a radio survey may be put is an analysis of the distribution of the radio sources on the celestial sphere to find out whether they are bunched into clusters or lie in preferred regions of space. There are many methods of testing for clustering in point processes and since they are not all equally good this contribution is presented as a brief guide to what seem to be the best of them. The radio sources certainly do not show very strong clustering and may well be entirely unclustered so if a statistical method is to be useful it must be both powerful and flexible. A statistic is powerful in this context if it can efficiently distinguish a weakly clustered distribution of sources from an unclustered one, and it is flexible if it can be applied in a way which avoids mistaking defects in the survey for true peculiarities in the distribution of sources.

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