4,109 research outputs found

    Choosing the best forage species for a dairy farm: The Whole-farm approach

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    Although a handful of forage species such as perennial ryegrass are predominant, there are a wide range of forage species that can be grown in sub tropical and temperate regions in Australia as dairy pastures. These species have differing seasonal yields, nutrient quality and water use efficiency characteristics, as demonstrated in a large study evaluating 30 species University of Sydney in New South Wales, Australia. Some species can be grazed, while others require mechanical harvesting that incurs a further cost. Previous comparisons of species that relied on yields of dry matter per unit of some input (typically land or water) cannot simultaneously take into account the season in which forage is produced, or other factors related to the costs of production and delivery to the cows. To effectively compare the profitability of individual species, or combinations of species, requires the use of a whole-farm model. Linear programming was used to find the most profitable mix of forage species for an irrigated dairy farm in an irrigation region of New South Wales, Australia. It was concluded that a typical farmer facing the prevailing milk and purchased feed prices with average milk production per cow would find a mix of species including large proportions of perennial ryegrass (Lolium perenne) and prairie grass (Bromus willdenowii) was most profitable. The result was robust to changes in seasonal milk pricing and moving from year round to seasonal calving patterns.Dairy, Forage, Whole-farm, Linear programming

    Distributed OpenGL Rendering in Network Bandwidth Constrained Environments

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    Display walls made from multiple monitors are often used when very high resolution images are required. To utilise a display wall, rendering information must be sent to each computer that the monitors are connect to. The network is often the performance bottleneck for demanding applications, like high performance 3D animations. This paper introduces ClusterGL; a distribution library for OpenGL applications. ClusterGL reduces network traffic by using compression, frame differencing and multi-cast. Existing applications can use ClusterGL without recompilation. Benchmarks show that, for most applications, ClusterGL outperforms other systems that support unmodified OpenGL applications including Chromium and BroadcastGL. The difference is larger for more complex scene geometries and when there are more display machines. For example, when rendering OpenArena, ClusterGL outperforms Chromium by over 300% on the Symphony display wall at The University of Waikato, New Zealand. This display has 20 monitors supported by five computers connected by gigabit Ethernet, with a full resolution of over 35 megapixels. ClusterGL is freely available via Google Code

    ARL Library Director Survey Results

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    Presents the findings from a national survey sent to library directors at ARL institutions. Neal estimates that 65 institutions employ approximately 564 area librarians nationwide. Neal discusses recent efforts to recruit qualified individuals for vacant positions and concludes that these institutions do not plan to increase the overall number of area librarians they employ

    Introduction of Speaker

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    James Neal introduces the keynote speaker, Patrick O'Meara, and highlights his professional accomplishments

    Introduction to Conference

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    Outlines the conference objectives, which are to discuss the results of the National Survey on Area Librarianship and draft a national action plan aimed at strengthening and advancing area librarianship