4,032 research outputs found

    The Infrared Nucleus of the Wolf-Rayet Galaxy Henize 2-10

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    We have obtained near-infrared images and mid-infrared spectra of the starburst core of the dwarf Wolf-Rayet galaxy He 2-10. We find that the infrared continuum and emission lines are concentrated in a flattened ellipse 3-4'' or 150 pc across which may show where a recent accretion event has triggered intense star formation. The ionizing radiation from this cluster has an effective temperature of 40,000 K, corresponding to 30M30M_\odot stars, and the starburst is 0.51.5×1070.5-1.5 \times 10^7 years old.Comment: 17 pages Latex, 7 postscript figures, 1 postscript table, accepted to A

    WILLINGNESS TO PARTICIPATE IN A BEEF CATTLE MARKETING COOPERATIVE

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    Based on the results of a 1999 survey of Mississippi Beef Cattle Producers, producers were willing to invest $1.66 per head marketed in a beef cattle marketing cooperative. Factors that had the largest positive impact on WTP were producers who were willing to permanently identify all of their cows and calves and producers who were willing to accept prices negotiated by the cooperative. Negative factors included producer willingness to implement a pre-weaning health management program and the percentage of replacement heifers purchased through regular auctions.Livestock Production/Industries, Marketing,

    A History of the Social Phases of the Temperance Movement in Kansas

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    This thesis was submitted to the Department of Sociology and the Faculty of the Graduate School in partial fulfillment of the requirements for the Master’s degree.The purpose of this paper is to give the history of the social phases, Ie., methods of agitation, education, organization and law enforcement from the time of the first settlements in Kansas and the establishment of the Territorial government, down to the present time. The history of the laws has been carried along with the social history because it is impossible to trace the one as it should be without the other. Each is necessary for the other because they were developed together and each depends on the other. Part II contains a summary of the methods of agitation, organization and law enforcement. This brief summary is taken from part I and put in this form in order to show more.clearly the development of the means used and for the purpose of ready reference in case a concise statement was wanted for practical purposes. Part III contains the opinions of one hundred and seventy-two bankers of the state in regard to prohibition

    The Aftermath of Katrina: Race, Undocumented Workers, and the Color of Money

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    This Article examines the possibility of an inter-minority coalition aiding the ongoing rebuilding in the aftermath of Hurricane Katrina. Part II of this Article discusses the history of both the Davis-Bacon Act and the Immigration Reform and Control Act. Part III discusses the aftermath of Hurricane Katrina as it relates to the aforementioned Acts. Part IV discusses the needs of both undocumented workers and African-Americans following Hurricane Katrina, and Part V discusses the proposed emergence of an inter-minority coalition to fulfill those needs

    Federal Safety Legislation

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    STOCKER CATTLE OWNERSHIP VS. CONTRACT GRAZING: A COMPARISON OF RISK-ADJUSTED RETURNS

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    Stocker cattle ownership is compared to contract grazing using stochastic simulation. Returns are evaluated for both cattle owners and caretakers in contract grazing agreements. For caretakers, contract grazing is significantly less risky than cattle ownership. For cattle owners, contracting reduces risk only slightly while significantly reducing expected returns.Livestock Production/Industries,

    Disruption to control network function correlates with altered dynamic connectivity in the wider autism spectrum.

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    Autism is a common developmental condition with a wide, variable range of co-occurring neuropsychiatric symptoms. Contrasting with most extant studies, we explored whole-brain functional organization at multiple levels simultaneously in a large subject group reflecting autism's clinical diversity, and present the first network-based analysis of transient brain states, or dynamic connectivity, in autism. Disruption to inter-network and inter-system connectivity, rather than within individual networks, predominated. We identified coupling disruption in the anterior-posterior default mode axis, and among specific control networks specialized for task start cues and the maintenance of domain-independent task positive status, specifically between the right fronto-parietal and cingulo-opercular networks and default mode network subsystems. These appear to propagate downstream in autism, with significantly dampened subject oscillations between brain states, and dynamic connectivity configuration differences. Our account proposes specific motifs that may provide candidates for neuroimaging biomarkers within heterogeneous clinical populations in this diverse condition

    High resolution spectroscopy of the 11.3 micron emission band

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    High resolution spectra of the 11.3 micron emission band in M82 and NGC 7027 were obtained using the University of Texas IR echelle spectrometer on the IRTF in April 1988. The spectral resolution was 0.004 micron, with coverage from 11.0 to 11.6 microns. Spectra were measured at ten positions along a 10 min. long slit. Analysis of the data is still in progress, but initial results show no clear evidence of narrow structure within the feature. The analysis will involve comparison of the observed spectra to laboratory and predicted spectra of Polycylic Aromatic Hydrocarbons (PAHs) and Quenched Carbonaceous Composite (QCCs) to determine which may be responsible for the emission. The spectra will be examined with a goal of determining whether the emission is caused by molecular or solid state material. The data are also examined for evidence of variations in the shape and strength of the 11.3 micron feature with position on the sky. In NGC 7027 the 10 min. long slit went across the edge of the ionized nebulae, allowing comparison of emission from both ionized and neutral regions

    An Infrared Comparison of Type-1 and Type-2 Quasars

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    We model the optical to far-infrared SEDs of a sample of six type-1 and six type-2 quasars selected in the mid-infrared. The objects in our sample are matched in mid-IR luminosity and selected based on their Spitzer IRAC colors. We obtained new targeted Spitzer IRS and MIPS observations and used archival photometry to examine the optical to far-IR SEDs. We investigate whether the observed differences between samples are consistent with orientation-based unification schemes. The type-1 objects show significant emission at 3 micron. They do not show strong PAH emission and have less far-IR emission on average when compared to the type-2 objects. The SEDs of the type-2 objects show a wide assortment of silicate features, ranging from weak emission to deep silicate absorption. Some also show strong PAH features. In comparison, silicate is only seen in emission in the type-1 objects. This is consistent with some of the type-2s being reddened by a foreground screen of cooler dust, perhaps in the host galaxy itself. We investigate the AGN contribution to the far-IR emission and find it to be significant. We also estimate the star formation rate for each of the objects by integrating the modeled far-IR flux and compare this with the SFR found from PAH emission. We find the type-2 quasars have a higher average SFR than the type-1 quasars based on both methods, though this could be due to differences in bolometric luminosities of the objects. While we find pronounced differences between the two types of objects, none of them are inconsistent with orientation-based unification schemes.Comment: Accepted for publication in Ap
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