15,787 research outputs found

    The Use of the Terms Negro and Black to Include Persons of Native American Ancestry in Anglo North America

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    In 1854 the California State Supreme Court sought to bar all non-Caucasians from equal citizenship and civil rights. The court stated: The word Black may include all Negroes, but the term Negro does not include all Black persons . . . . We are of the opinion that the words White, Negro, Mulatto and Black person, whenever they occur in our constitution . . . must be taken in their generic sense . . . that the words Black person, in the 14th section must be taken as contra distinguished from White, and necessarily includes all races other than the Caucasian.[1] As convoluted as the quote may be, it tends to express a strong tendency in the history of the United States, toward creating two broad classes of people: white and non-white, citizen and non-citizen (or semi-citizen)

    Theta Graph Designs

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    We solve the design spectrum problem for all theta graphs with 10, 11, 12, 13, 14 and 15 edges

    Icosahedron designs

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    It is known from the work of Adams and Bryant that icosahedron designs of order v exist for v ≡ 1 (mod 60) as well as for v = 16. Here we prove that icosahedron designs exist if and only if v ≡ 1, 16, 21 or 36 (mod 60), wit

    Fascism: A Review of Its History and Its Present Cultural Reality in the Americas

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    The Italians may have given us the word “fascismo,” but whether we use that word or the Spanish ”falangismo” or the German “National Socialism” (Naziism) we are talking about a form of social organization which has a complex history. Indeed, many persons wrongly believe that fascism as a political system first achieved state power in Italy in the 1920s. However, fascism in modern times first achieved independent (sovereign) power in the Americas -- in the Argentina of Juan Manuel de Rosas (1830s) and in the Confederate States of America (1860-1865)

    The Southern Vilnius Photometric System. IV. The E Regions Standard Stars

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    This paper is the fourth in a series on the extension of the Vilnius photometric system to the southern hemisphere. Observations were made of 60 stars in the Harvard Standard E regions to increase a set of standard stars.Comment: 6 pages, TeX, requires 2 macros (baltic2.tex, baltic4.tex) included no figures, to be published in Baltic Astronomy, Vol 6, pp1-6 (1997

    EM Algorithms for Weighted-Data Clustering with Application to Audio-Visual Scene Analysis

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    Data clustering has received a lot of attention and numerous methods, algorithms and software packages are available. Among these techniques, parametric finite-mixture models play a central role due to their interesting mathematical properties and to the existence of maximum-likelihood estimators based on expectation-maximization (EM). In this paper we propose a new mixture model that associates a weight with each observed point. We introduce the weighted-data Gaussian mixture and we derive two EM algorithms. The first one considers a fixed weight for each observation. The second one treats each weight as a random variable following a gamma distribution. We propose a model selection method based on a minimum message length criterion, provide a weight initialization strategy, and validate the proposed algorithms by comparing them with several state of the art parametric and non-parametric clustering techniques. We also demonstrate the effectiveness and robustness of the proposed clustering technique in the presence of heterogeneous data, namely audio-visual scene analysis.Comment: 14 pages, 4 figures, 4 table

    The optical and near-infrared properties of nearby groups of galaxies

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    We present a study of the optical (BRI) and near-infrared (JHK) luminosity fuctions (LFs) of the GEMS sample of 60 nearby groups of galaxies between 0<z<0.04, with our optical CCD photometry and near-IR photometry from the 2MASS survey. The LFs in all filters show a depletion of galaxies of intermediate luminosity, two magnitudes fainter than L*, within 0.3 R{500} from the centres of X-ray faint groups. This feature is not as pronounced in X-ray bright gropus, and vanishes when LFs are found out to R{500}, even in the X-ray dim groups. We argue that this feature arises due to the enhanced merging of intermediate-mass galaxies in the dynamically sluggish environment of low velocity-dispersion groups, indicating that merging is important in galaxy evolution even at z~0.Comment: to appear in the proceedings of the ESO workshop "Groups of Galaxies in the Nearby Universe", Santiago, Dec 5-9, 2005. Eds. I. Saviane, V. Ivanov, & J. Borissova (Springer Verlag); 5 page
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