3,464 research outputs found

    Aging with Cerebral Palsy: A Consumer’s Perspective

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    Educational Objectives 1. To illustrate the necessity of an holistic approach to addressing the changing health care needs of adults with Cerebral Palsy. 2. To show the necessity of dealing honestly and creatively with the intimacy/sexuality concerns of older adults with Cerebral Palsy

    The radio luminosity function of radio-loud quasars from the 7C Redshift Survey

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    We present a complete sample of 24 radio-loud quasars (RLQs) from the new 7C Redshift Survey. Every quasar with a low-frequency (151 MHz) radio flux-density S_151 > 0.5 Jy in two regions of the sky covering 0.013 sr is included; 23 of these have sufficient extended flux to meet the selection criteria, 18 of these have steep radio spectra (hereafter denoted as SSQs). The key advantage of this sample over most samples of RLQs is the lack of an optical magnitude limit. By combining the 7C and 3CRR samples, we have investigated the properties of RLQs as a function of redshift z and radio luminosity L_151. We derive the radio luminosity function (RLF) of RLQs and find that the data are well fitted by a single power-law with slope alpha_1=1.9. We find that there must be a break in the RLQ RLF at log_10(L_151 / W Hz^-1 sr^-1) < 27, in order for the models to be consistent with the 7C and 6C source counts. The z-dependence of the RLF follows a one-tailed gaussian which peaks at z=1.7. We find no evidence for a decline in the co-moving space density of RLQs at higher redshifts. A positive correlation between the radio and optical luminosities of SSQs is observed, confirming a result of Serjeant et al. (1998). We are able to rule out this correlation being due to selection effects or biases in our combined sample. The radio-optical correlation and best-fit model RLF enable us to estimate the distribution of optical magnitudes of quasars in samples selected at low radio frequencies. We conclude that for samples with S_151 < 1 Jy one must use optical data significantly deeper than the POSS-I limit (R approx 20), in order to avoid severe incompleteness.Comment: 28 pages with 13 figures. To appear in MNRA

    Ionized Gas Kinematics At High Resolution. II. Discovery Of A Double Infrared Cluster In II Zw 40

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    The nearby dwarf galaxy II Zw 40 hosts an intense starburst. At the center of the starburst is a bright compact radio and infrared source, thought to be a giant dense H II region containing approximate to 14,000 O stars. Radio continuum images suggest that the compact source is actually a collection of several smaller emission regions. We accordingly use the kinematics of the ionized gas to probe the structure of the radio-infrared emission region. With TEXES on the NASA-IRTF we measured the 10.5 mu m [S IV] emission line with effective spectral resolutions, including thermal broadening, of similar to 25 and similar to 3 km s(-1) and spatial resolution similar to 1 ''. The line profile shows two distinct, spatially coextensive, emission features. The stronger feature is at galactic velocity and has FWHM 47 km s(-1). The second feature is similar to 44 km s(-1) redward of the first and has FWHM 32 km s(-1). We argue that these are two giant embedded clusters, and estimate their masses to be approximate to 3 x 10(5) M-circle dot and approximate to 1.5 x 10(5) M-circle dot. The velocity shift is unexpectedly large for such a small spatial offset. We suggest that it may arise in a previously undetected kinematic feature remaining from the violent merger that formed the galaxy.University of Hawaii NNX-08AE38ANSF AST-0607312NASAAstronom

    Radio Galaxy Clustering at z~0.3

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    Radio galaxies are uniquely useful as probes of large-scale structure as their uniform identification with giant elliptical galaxies out to high redshift means that the evolution of their bias factor can be predicted. As the initial stage in a project to study large-scale structure with radio galaxies we have performed a small redshift survey, selecting 29 radio galaxies in the range 0.19<z<0.45 from a contiguous 40 square degree area of sky. We detect significant clustering within this sample. The amplitude of the two-point correlation function we measure is consistent with no evolution from the local (z<0.1) value. This is as expected in a model in which radio galaxy hosts form at high redshift and thereafter obey a continuity equation, although the signal:noise of the detection is too low to rule out other models. Larger surveys out to z~1 should reveal the structures of superclusters at intermediate redshifts and strongly constrain models for the evolution of large-scale structure.Comment: 7 pages, 3 figures, accepted by ApJ Letter

    \u3cem\u3eThe Missouri Compromise and Its Aftermath: Slavery and the Meaning of America\u3c/em\u3e, by Robert Pierce Forbes

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    A review of The Missouri Compromise and Its Aftermath: Slavery and the Meaning of America, by Robert Pierce Forbe

    \u3cem\u3eThe Burden of Dependency: Colonial Themes in Southern Economic Thought\u3c/em\u3e, by Joseph J. Persky

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    A review of The Burden of Dependency: Colonial Themes in Southern Economic Thought, by Joseph J. Persk

    \u3cem\u3eMasters and Lords: Mid-Nineteenth Century U.S. Planters and Prussian Junkers\u3c/em\u3e, by Shearer Davis Bowman

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    A review of Masters and Lords: Mid-Nineteenth Century U.S. Planters and Prussian Junkers, by Shearer Davis Bowma

    \u3cem\u3eUnification of a Slave State: The Rise of the Planter Class in the South Carolina Backcountry, 1760-1808\u3c/em\u3e, by Rachel N. Klein

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    A review of Unification of a Slave State: The Rise of the Planter Class in the South Carolina Backcountry, 1760-1808, by Rachel N. Klei

    Cwbr Author Interview Deliver Us From Evil: The Slavery Question In The Old South

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    Interview with Dr. Lacy K. Ford, Jr., Professor of History at the University of South Carolina Interviewed by Nathan Buman CWBR : I\u27m here today with Lacy K. Ford, author of Deliver Us from Evil: The Question of Slavery in the Old South. Professor Ford, thank you for joining me. Lacy K. Ford (LKF): I\u27m happy to be here
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