1,638 research outputs found

    Alien Registration- Dallaire, Lucien J. (Lewiston, Androscoggin County)

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    https://digitalmaine.com/alien_docs/29593/thumbnail.jp

    Alien Registration- Dallaire, Onil J. (Lewiston, Androscoggin County)

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    https://digitalmaine.com/alien_docs/29589/thumbnail.jp

    Array E uplink redundancy method justification

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    This ATM provides the reliability justification for the redundancy method employed in the Array E (Apollo 17) uplink. The Array E uplink employs standby redundancy without cross-over and automatic switch-over after 61 hours in the event of uplink failure.prepared by R. J. Dallaire, D. J. Thomas

    Biobank Economics and the “Commercialization Problem”

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    The economic aspects of biobanking are intertwined with the social and scientific aspects. We describe two problems that structure the discussion about the economics of biobanking and which illustrate this intertwining. First, there is a ‘sustainability problem’ about how to maintain biobanks in the long term. Second, and representing a partial response to the first problem, there is a ‘commercialisation problem’ about how to deal with the voluntary altruistic relationship between participants and biobanks, and the potential commercial relationships that a biobank may form. Social scientists have argued that the commercialisation problem is inadequate as a way to construct the multiple tensions that biobanks must negotiate. We agree that the commercialisation problem is an inadequate framework; turning to alternative accounts of bioeconomy, we suggest that contemporary consideration of the economics of biobanking primarily in terms of participants and their bodily tissue may reproduce the very commodification of science that these scholars critique. We suggest that an alternative conception of the economics of biobanking beyond the logics of commodification, which may thereby allow broader questions about the social and economic conditions and consequences of biobanks to be posed

    Euler-Bessel and Euler-Fourier Transforms

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    We consider a topological integral transform of Bessel (concentric isospectral sets) type and Fourier (hyperplane isospectral sets) type, using the Euler characteristic as a measure. These transforms convert constructible \zed-valued functions to continuous \real-valued functions over a vector space. Core contributions include: the definition of the topological Bessel transform; a relationship in terms of the logarithmic blowup of the topological Fourier transform; and a novel Morse index formula for the transforms. We then apply the theory to problems of target reconstruction from enumerative sensor data, including localization and shape discrimination. This last application utilizes an extension of spatially variant apodization (SVA) to mitigate sidelobe phenomena

    STR-995: CALIBRATION OF AN ANALYTICAL METHOD FOR VEHICLE-INDUCED VIBRATIONS ON FLEXIBLE BRIDGES

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    The results of full scale trials of heavy vehicle-induced vibrations on the Pierre Laporte Bridge are presented. The Pierre Laporte Bridge spans approximately 1 km having the longest main span of any suspension bridge in Canada. The tests were performed during short periods of complete bridge closure on October 27 and 28, 2014. During the tests, the acceleration of the bridge was recorded at multiple locations in addition to measurements of the vertical and pitching accelerations of the testing vehicle itself. The results of these tests are used to calibrate an analytical tool developed to screen bridge designs for potential serviceability concerns due to vehicle-induced vibrations. Numerical simulations are performed using this analytical method and compared directly to the results of the full scale trials. Good agreement is found between the peak predictions and the measurements highlighting the effectiveness of the screening tool during the design of medium- to long-span bridges. No cases of pedestrian discomfort to any kind of dynamic excitations have been reported since the Pierre Laporte Bridge opened in 1970, and the results measured during the full scale trials and those simulated numerically reflect these observations

    Active removal of inorganic phosphate from cerebrospinal fluid by the choroid plexus

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    The P-i concentration of mammalian cerebrospinal fluid (CSF) is about one-half that of plasma, a phenomenon also shown here in the spiny dogfish, Squalus acanthias. The objective of the present study was to characterize the possible role of the choroid plexus (CP) in determining CSF P-i concentration. The large sheet-like fourth CP of the shark was mounted in Ussing chambers where unidirectional P-33(i) fluxes revealed potent active transport from CSF to the blood side under short-circuited conditions. The flux ratio was 8: 1 with an average transepithelial resistance of 87 +/- 17.9 Omega . cm(2) and electrical potential difference of + 0.9 +/- 0.17 mV (CSF side positive). Active P-i absorption from CSF was inhibited by 10 mM arsenate, 0.2 mM ouabain, Na+ -free medium, and increasing the K+ concentration from 5 to 100 mM. Li+ stimulated transport twofold compared with Na+-free medium. Phosphonoformic acid (1 mM) had no effect on active Pi transport. RT-PCR revealed both P-i transporter (PiT) 1 and PiT2 (SLC20 family) gene expression, but no Na+ -P-i cotransporter II (SLC34 family) expression, in the shark CP. PiT2 immunoreactivity was shown by immunoblot analysis and localized by immunohistochemistry in (or near) the CP apical microvillar membranes of both the shark and rat. PiT1 appeared to be localized primarily to vascular endothelial cells. Taken together, these data indicate that the CP actively removes P-i from CSF. This process has transport properties consistent with a PiT2, Na+-dependent transporter that is located in the apical region of the CP epithelium.National Science Foundation [0843253]; Fundacao para a Ciencia e a Tecnologia, Portuga

    Nanoengineered Astronomical Optics

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    We describe a technology for the fabrication of inexpensive and versatile mirrors through the use of a new type of nanoengineered optical material composed by the spreading of a self-assembling reflective colloidal film spread at the surface of a liquid. These new reflecting liquids offer interesting possibilities for astronomical instrumentation. For example, they can replace mercury in conventional rotating liquid mirrors. The main advantages offered include extremely low cost and, by coating a viscous liquid, the possibility of tilting the mirror by a few tens of degrees. We also have coated ferromagnetic liquids with these reflecting films. The resulting surfaces can be shaped by the application of a magnetic field, yielding reflecting surfaces that can have complicated shapes that can rapidly shift with time. These inexpensive and versatile optical elements could have numerous scientific and technological applications. Among possible astronomical applications, they could be used to make large inexpensive adaptive mirrors exhibiting strokes ranging from nanometers to several millimeters.Comment: Submitted to Astrophysical Journal Letters. 18 pages, 4 figure
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