53,535 research outputs found

    \u3cem\u3eMerry Hearts Make Light Days: The War of 1812 Journal of Lieutenant John Le Couteur, 104th Foot\u3c/em\u3e edited by Donald E. Graves [Review]

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    Review of Donald Graves (ed.), Merry Hearts Make Light Days: The War of 1812 Journal of Lieutenant John Le Conteur, 104th Foot

    Driver for solar cell I-V characteristic plots

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    A bipolar voltage ramp generator which applies a linear voltage through a resistor to a solar cell for plotting its current versus voltage (I-V) characteristic between short circuit and open circuit conditions is disclosed. The generator has automatic stops at the end points. The resistor serves the multiple purpose of providing a current sensing resistor, setting the full-scale current value, and providing a load line with a slope approximately equal to one, such that it will pass through the origin and the approximate center of the I-V curve with about equal distance from that center to each of the end points

    Development of a data management front end for use with a LANDSAT based information system

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    A user friendly front end was constructed to facilitate access to the LANDSAT mosaic data base supplied by JPL and to process both LANDSAT and ancillary data. Archieval and retrieval techniques were developed to efficiently handle this data base and make it compatible with requirements of the Pennsylvania Bureau of Forestry. Procedures are ready for: (1) forming the forest/nonforest mask in ORSER compressed map format using GSFC-supplied classification procedures; (2) registering data from a new scene (defoliated) to the mask (which may involve mosaicking if the area encompasses two LANDSAT scenes; (3) producing a masked new data set using the MASK program; (4) analyzing this data set to produce a map showing degrees of defoliation, output on the Versatec plotter; and (5) producing color composite maps by a diazo-type process

    An algorithmic definition of the axial map

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    The fewest-line axial map, often simply referred to as the 'axial map, is one of the primary tools of space syntax. Its natural language definition has allowed researchers to draw consistent maps that present a concise description of architectural space; it has been established that graph measures obtained from the map are useful for the analysis of pedestrian movement patterns and activities related to such movement: for example, the location of services or of crime. However, the definition has proved difficult to translate into formal language by mathematicians and algorithmic implementers alike. This has meant that space syntax has been criticised for a lack of rigour in the definition of one of its fundamental representations. Here we clarify the original definition of the fewest-line axial map and show that it can be implemented algorithmically. We show that the original definition leads to maps similar to those currently drawn by hand, and we demonstrate that the differences between the two may be accounted for in terms of the detail of the algorithm used. We propose that the analytical power of the axial map in empirical studies derives from the efficient representation of key properties of the spatial configuration that it captures

    Labor in the New Urban Battlegrounds: Local Solidarity in a Global Economy

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    [Excerpt] Labor in the New Urban Battlegrounds is an energizing, optimistic book. By using the contemporary metropolis as a comparative laboratory to see what contexts and strategies contribute best to labor revitalization, Lowell Turner, Daniel Cornfield, and their collaborators generate a fresh sense of positive possibilities for labor and new insights as to how creative actors can best take advantage of those possibilities. Energizing optimism should not be confused with seeing things through rose-colored glasses. The book fully acknowledges the odds against labor revitalization and the structural obstacles to a more equitable society. Optimism is generated by pairing obstacles with possibilities, often brought to light by another city in which similar obstacles have been overcome with innovative strategies. This book builds on a new tradition of recent analyses of U.S. labor that compellingly contests previous premature obituaries of the labor movement while making a distinctive contribution. Its power is rooted in the comparative metropolis analytical theme and the editors\u27 skill in bringing a diverse baker\u27s dozen of substantive studies to bear on it. The individual chapters are empirically diverse, complementing a gamut of metropolitan areas in the United States with comparative cases from Europe. They employ varied methodological approaches to look at the social infrastructure and strategic choices that underlie urban successes and failures. Many chapters are in-depth case studies of individual cities, while others (e.g., Greer, Byrd, and Fleron; Hauptmeier and Turner) are paired comparisons. Still others (Applegate; Luce; Reynolds) draw their evidence from larger numbers of cities. One (Sellers) employs an ingenious analysis of cross-national data to draw inferences about differences in urban strategic possibilities. The result is much more powerful analytically than it would have been had the editors collected thirteen metropolitan case studies and then tried to figure out their comparative implications. Empirical range and methodological diversity augment the power of the volume, but the overarching focus on comparative metropolitan analysis is what gives the book its distinctive analytical punch. Even though a variety of organizations and social actors populate the stage—campaigns, nongovernmental organizations, individual unions, and ethnic communities—defining the urban area as the stage on which the dramas occur was a critical decision. From this decision flows the book\u27s special contribution to refocusing contemporary labor debates

    Knowledge development for organic systems: An example of weed management

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    Despite the large amount information on weed biology and specific weed control measures produced by researchers, organic farmers still prioritise weeds as an important area for further research. A recent project investigating weed management in organic farming systems has established that knowledge and learning are key requirements for this to be effective. Development of relevant, practically useful knowledge depends on access to information generated ‘scientifically’ by researchers and also to knowledge generated as a result of farmer experience with weeds. This requires that farmers, advisors and researchers take a participatory approach to collecting and processing information on weed management, using it to develop new and relevant knowledge. The appropriate framework for knowledge development is thus a collegiate one in which all stakeholders’ value and learn from the observations and experience of others. These findings have implications for the way in which research is conducted and funded

    Alessi 95 and the short period Cepheid SU Cassiopeiae

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    The parameters for the newly-discovered open cluster Alessi 95 are established on the basis of available photometric and spectroscopic data, in conjunction with new observations. Colour excesses for spectroscopically-observed B and A-type stars near SU Cas follow a reddening relation described by E(U-B)/E(B-V)=0.83+0.02*E(B-V), implying a value of R=Av/E(B-V)~2.8 for the associated dust. Alessi 95 has a mean reddening of E(B-V)_(B0)=0.35+-0.02 s.e., an intrinsic distance modulus of Vo-Mv=8.16+-0.04 s.e. (+-0.21 s.d.), d=429+-8 pc, and an estimated age of 10^8.2 yr from ZAMS fitting of available UBV, CCD BV, NOMAD, and 2MASS JHKs observations of cluster stars. SU Cas is a likely cluster member, with an inferred space reddening of E(B-V)=0.33+-0.02 and a luminosity of =-3.15+-0.07 s.e., consistent with overtone pulsation (P_FM=2.75 d), as also implied by the Cepheid's light curve parameters, rate of period increase, and Hipparcos parallaxes for cluster stars. There is excellent agreement of the distance estimates for SU Cas inferred from cluster ZAMS fitting, its pulsation parallax derived from the infrared surface brightness technique, and Hipparcos parallaxes, which all agree to within a few percent.Comment: Accepted for Publication (MNRAS
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