80,953 research outputs found

    An International Prospectus for Library & Information Professionals: Development, Leadership and Resources for Evolving Patron Needs

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    The roles of library and information professionals must change and evolve to: 1. accommodate needs of tech-savvy patrons; 2. thrive in the Commons & Library 2.0; 3. provide integrated, just-in-time services; 4. constantly update and enhance technology; 5. design appropriate library spaces for research and productivity; 6.adapt to new models of scholarly communication and publication, especially: the Open Archives Initiative and digital repositories; 7. remain abreast of national and interanational academic and legislative initiatives affecting the provision of information services and resources. Professionals will need to collaborate in: 1. Formal & informal networks – regional, national, and international; and; 2. Library staff development initiatives – regional, national, international Professionals will need to use libraries as laboratories for ongoing, lifelong training and education of patrons and of all library staff ( internal patrons ): the library is the framework in which Information Research Literacy is the curriculum . Professionals will need to remain aware of trends and challenges in their regions, the EU, the US and North America, of models which might provide inspiration and support: 1. Top Technology Trends; 2. New paradigms of professionalism; 3. Knowledge-creation and knowledge consumption; 4. The shifting balance of the physical library with the virtual-digital librar

    High intensity heat-pulse source operates without cooling system

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    Tungsten-iodine quartz lamp with on-off control is mounted at focus of ellipsoidal reflector and shutter is mounted at conjugate focus. Flux sensor monitors lamp and actuates shutter which emits a heat pulse when the radiant flux builds up to requisite level

    PVF pyroelectric radiometer

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    Polyvinylfluoride (PVF) plastic film was found to be a good pyroelectric material. Radiometers using PVF were developed that exhibit high sensitivity and frequency response. Normalized detectivities of greater than 10 to the 8th power cm/Hz/w and responsivities on the order of 100,000 V/W were measured (500 C BB source, 0.1 Hz chopping frequency and 1 Hz bandwidth.

    Ambient temperature recorder

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    A temperature data recorder, designated the Ambient Temperature Recorder (ATR-4), was developed at NASA Ames Research Center to meet particular requirements for space life sciences experiments. The small, self-contained, four-channel, battery-powered device records 32 kilobytes of temperature data over a range of -40 to +60 C at four sampling intervals ranging from 1.875 to 15 minutes. Data is stored in its internal electronic memory for later readout by a personal computer

    Nonconvex notions of regularity and convergence of fundamental algorithms for feasibility problems

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    We consider projection algorithms for solving (nonconvex) feasibility problems in Euclidean spaces. Of special interest are the Method of Alternating Projections (MAP) and the Douglas-Rachford or Averaged Alternating Reflection Algorithm (AAR). In the case of convex feasibility, firm nonexpansiveness of projection mappings is a global property that yields global convergence of MAP and for consistent problems AAR. Based on (\epsilon, \delta)-regularity of sets developed by Bauschke, Luke, Phan and Wang in 2012, a relaxed local version of firm nonexpansiveness with respect to the intersection is introduced for consistent feasibility problems. Together with a coercivity condition that relates to the regularity of the intersection, this yields local linear convergence of MAP for a wide class of nonconvex problems,Comment: 22 pages, no figures, 30 reference

    Transforming Library Service Through Information Commons: Part 1 - Introduction

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    An introduction to the concept of the Information Commons in libraries

    A Globally Linearly Convergent Method for Pointwise Quadratically Supportable Convex-Concave Saddle Point Problems

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    We study the \emph{Proximal Alternating Predictor-Corrector} (PAPC) algorithm introduced recently by Drori, Sabach and Teboulle to solve nonsmooth structured convex-concave saddle point problems consisting of the sum of a smooth convex function, a finite collection of nonsmooth convex functions and bilinear terms. We introduce the notion of pointwise quadratic supportability, which is a relaxation of a standard strong convexity assumption and allows us to show that the primal sequence is R-linearly convergent to an optimal solution and the primal-dual sequence is globally Q-linearly convergent. We illustrate the proposed method on total variation denoising problems and on locally adaptive estimation in signal/image deconvolution and denoising with multiresolution statistical constraints.Comment: 34 pages, 18 figure

    Calorimeter probes for measuring high thermal flux

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    Expendable, slug-type calorimeter probes were developed for measuring high heat-flux levels of 10-30 kW/sq cm in electric-arc jet facilities. The probes were constructed with thin tungsten caps mounted on Teflon bodies. The temperature of the back surface of the tungsten cap is measured, and its time rate of change gives the steady-state absorbed heat flux as the calorimeter probe heats to destruction when inserted into the arc jet. Design, construction, test, and performance data are presented

    Systematically disseminating technological information to potential users

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    Rapid technological information dissemination system related to the field of remote sensing is presented. The technology transfer staff systematically designed instructional materials and activities using the matrix as an organizer to meet the need of the students, scientists and users in a rapidly expanding technology

    Powerful jets from accreting black holes: evidence from the optical and infrared

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    A common consequence of accretion onto black holes is the formation of powerful, relativistic jets that escape the system. In the case of supermassive black holes at the centres of galaxies this has been known for decades, but for stellar-mass black holes residing within galaxies like our own, it has taken recent advances to arrive at this conclusion. Here, a review is given of the evidence that supports the existence of jets from accreting stellar-mass black holes, from observations made at optical and infrared wavelengths. In particular it is found that on occasion, jets can dominate the emission of these systems at these wavelengths. In addition, the interactions between the jets and the surrounding matter produce optical and infrared emission on large scales via thermal and non-thermal processes. The evidence, implications and applications in the context of jet physics are discussed. It is shown that many properties of the jets can be constrained from these studies, including the total kinetic power they contain. The main conclusion is that like the supermassive black holes, the jet kinetic power of accreting stellar-mass black holes is sometimes comparable to their bolometric radiative luminosity. Future studies can test ubiquities in jet properties between objects, and attempt to unify the properties of jets from all observable accreting black holes, i.e. of all masses.Comment: 26 pages, 4 figures, 1 table. Invited chapter for the edited book "Black Holes and Galaxy Formation", Nova Science Publishers, Inc., at pres
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