2,882 research outputs found

    CONSTITUTIONAL LAW -- INTERSTATE COMMERCE -- VALIDITY OF FEDERAL STATUTE PROHIBITING INTERSTATE SHIPMENT OF PRISON-MADE GOODS

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    The recent decision of the Supreme Court in Kentucky Whip & Collar Co. v. Illinois Central R. R., provides an effective method of circumventing the doctrine of Hammer v. Dagenhart, which held that Congress may not prohibit the interstate transportation of commodities which are harmless except for their economic effect in the state of destination. It is hailed by the advocates of reform as furnishing an avenue of approach to such problems as the regulation of minimum wages and hours and child labor

    CONSTITUTIONAL LAW-RESALE PRICE MAINTENANCE -FAIR TRADE ACTS

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    Four cases upholding the validity of the California and Illinois Fair Trade Acts were recently sustained by the United States Supreme Court. All four cases involved a similar set of facts. Plaintiffs, the owners or authorized distributors of certain well known trade-marked articles, entered into a series of contracts with wholesalers and retailers fixing the resale prices of their branded products. When defendants, certain retailers who had refused to enter into such agreements, persisted in reselling the articles below the prices stipulated in the contracts with other retailers, plaintiffs sued to enjoin them under the provisions of the state Fair Trade Acts. The injunctions were allowed by the California and Illinois Supreme Courts over the objection of defendants that the statutes were invalid under the due process and equal protection clauses. On appeal to the United States Supreme Court it was held that the statutes were legitimate measures designed to protect the good will of a producer as symbolized in his trade-marked goods. Old Dearborn Distributing Co. v. Seagram-Distillers Corp., McNeil v. Joseph Triner Corp., Pep Boys v. Pyroil Sales Co., Kunsman v. Max Factor & Co., (U. S. 1936) 57 S. Ct. 139, 147

    Attributes of Successful Graduate Students: Facilitating Self-Efficacy and Persistence

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    Colleges and universities struggle with declining program completion rates among graduate students. While the attrition rate of graduate students declined over the last five years in the United States, the issue of graduate student persistence continues to be challenging. This study identifies and explores reported characteristics: expectations, motivation, self-discipline, emotional intelligence, and passion for learning. Graduate students studying educational leadership conducted a qualitative inquiry to approach theoretical comprehension of the intrinsic motivations, expectations, and major attributes of successful graduate students. Examining these areas provides a deeper understanding of success achieved by graduate students

    Hectospec, the MMT's 300 Optical Fiber-Fed Spectrograph

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    The Hectospec is a 300 optical fiber fed spectrograph commissioned at the MMT in the spring of 2004. A pair of high-speed six-axis robots move the 300 fiber buttons between observing configurations within ~300 s and to an accuracy ~25 microns. The optical fibers run for 26 m between the MMT's focal surface and the bench spectrograph operating at R~1000-2000. Another high dispersion bench spectrograph offering R~5,000, Hectochelle, is also available. The system throughput, including all losses in the telescope optics, fibers, and spectrograph peaks at ~10% at the grating blaze in 1" FWHM seeing. Correcting for aperture losses at the 1.5" diameter fiber entrance aperture, the system throughput peaks at ∼\sim17%. Hectospec has proven to be a workhorse instrument at the MMT. Hectospec and Hectochelle together were scheduled for 1/3 of the available nights since its commissioning. Hectospec has returned \~60,000 reduced spectra for 16 scientific programs during its first year of operation.Comment: 68 pages, 28 figures, to appear in December 2005 PAS

    Evaluation of gliovascular functions of AQP4 readthrough isoforms

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    Aquaporin-4 (AQP4) is a water channel protein that links the astrocytic endfeet to the blood-brain barrier (BBB) and regulates water and potassium homeostasis in the brain, as well as the glymphatic clearance of waste products that would otherwise potentiate neurological diseases. Recently, translational readthrough was shown to generate a C-terminally extended variant of AQP4, known as AQP4x, which preferentially localizes around the BBB through interaction with the scaffolding protein α-syntrophin, and loss of AQP4x disrupts waste clearance from the brain. To investigate the function of AQP4x, we generated a novel AQP4 mouse line (AllX) to increase relative levels of the readthrough variant above the ~15% of AQP4 in the brain of wild-type (WT) mice. We validated the line and assessed characteristics that are affected by the presence of AQP4x, including AQP4 and α-syntrophin localization, integrity of the BBB, and neurovascular coupling. We compared All

    The advanced LIGO input optics

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    The advanced LIGO gravitational wave detectors are nearing their design sensitivity and should begin taking meaningful astrophysical data in the fall of 2015. These resonant optical interferometers will have unprecedented sensitivity to the strains caused by passing gravitational waves. The input optics play a significant part in allowing these devices to reach such sensitivities. Residing between the pre-stabilized laser and the main interferometer, the input optics subsystem is tasked with preparing the laser beam for interferometry at the sub-attometer level while operating at continuous wave input power levels ranging from 100 mW to 150 W. These extreme operating conditions required every major component to be custom designed. These designs draw heavily on the experience and understanding gained during the operation of Initial LIGO and Enhanced LIGO. In this article, we report on how the components of the input optics were designed to meet their stringent requirements and present measurements showing how well they have lived up to their design

    The Advanced LIGO Input Optics

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    The advanced LIGO gravitational wave detectors are nearing their design sensitivity and should begin taking meaningful astrophysical data in the fall of 2015. These resonant optical interferometers will have unprecedented sensitivity to the strains caused by passing gravitational waves. The input optics play a significant part in allowing these devices to reach such sensitivities. Residing between the pre-stabilized laser and the main interferometer, the input optics subsystem is tasked with preparing the laser beam for interferometry at the sub-attometer level while operating at continuous wave input power levels ranging from 100 mW to 150 W. These extreme operating conditions required every major component to be custom designed. These designs draw heavily on the experience and understanding gained during the operation of Initial LIGO and Enhanced LIGO. In this article, we report on how the components of the input optics were designed to meet their stringent requirements and present measurements showing how well they have lived up to their design

    The Science Case for an Extended Spitzer Mission

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    Although the final observations of the Spitzer Warm Mission are currently scheduled for March 2019, it can continue operations through the end of the decade with no loss of photometric precision. As we will show, there is a strong science case for extending the current Warm Mission to December 2020. Spitzer has already made major impacts in the fields of exoplanets (including microlensing events), characterizing near Earth objects, enhancing our knowledge of nearby stars and brown dwarfs, understanding the properties and structure of our Milky Way galaxy, and deep wide-field extragalactic surveys to study galaxy birth and evolution. By extending Spitzer through 2020, it can continue to make ground-breaking discoveries in those fields, and provide crucial support to the NASA flagship missions JWST and WFIRST, as well as the upcoming TESS mission, and it will complement ground-based observations by LSST and the new large telescopes of the next decade. This scientific program addresses NASA's Science Mission Directive's objectives in astrophysics, which include discovering how the universe works, exploring how it began and evolved, and searching for life on planets around other stars.Comment: 75 pages. See page 3 for Table of Contents and page 4 for Executive Summar

    NGC6240: Merger-Induced Star Formation & Gas Dynamics

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    We present spatially resolved integral field spectroscopic K-band data at a resolution of 0.13" (60pc) and interferometric CO(2-1) line observations of the prototypical merging system NGC6240. Despite the clear rotational signature, the stellar kinematics in the two nuclei are dominated by dispersion. We use Jeans modelling to derive the masses and the mass-to-light ratios of the nuclei. Combining the luminosities with the spatially resolved Br-gamma equivalent width shows that only 1/3 of the K-band continuum from the nuclei is associated with the most recent star forming episode; and that less than 30% of the system's bolometric luminosity and only 9% of its stellar mass is due to this starburst. The star formation properties, calculated from typical merger star formation histories, demonstrate the impact of different assumptions about the star formation history. The properties of the nuclei, and the existence of a prominent old stellar population, indicate that the nuclei are remnants of the progenitor galaxies' bulges.Comment: 18 pages, 14 figures. Accepted for publication in A&
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