1,804 results for Book

  • The Proceedings of the Lincoln College Farmers' Conference 1963

    McArthur, A. T. G.

    Book
    Lincoln University

    The published proceedings of the 13th Lincoln College Farmers' Conference, held in 1963.

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  • The Proceedings of the Lincoln College Farmers' Conference 1964

    McArthur, A. T. G.

    Book
    Lincoln University

    The published proceedings of the 14th Lincoln College Farmers' Conference, held in 1964.

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  • The Proceedings of the Lincoln College Farmers' Conference 1966

    McArthur, A. T. G.

    Book
    Lincoln University

    The published proceedings of the 16th Lincoln College Farmers' Conference, held in 1966.

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  • The Proceedings of the Lincoln College Farmers' Conference 1983

    Crabb, D. H.

    Book
    Lincoln University

    The published proceedings of the 33rd Lincoln College Farmers' Conference, held in 1983.

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  • The Proceedings of the Lincoln College Farmers' Conference 1969

    McArthur, A. T. G.

    Book
    Lincoln University

    The published proceedings of the 19th Lincoln College Farmers' Conference, held in 1969.

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  • The Proceedings of the Lincoln College Farmers' Conference 1982

    Crabb, D. H.

    Book
    Lincoln University

    The published proceedings of the 32nd Lincoln College Farmers' Conference, held in 1982.

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  • The Proceedings of the Lincoln College Farmers' Conference 1974

    Crabb, D. H.

    Book
    Lincoln University

    The published proceedings of the 24th Lincoln College Farmers' Conference, held in 1974.

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  • The Proceedings of the Lincoln College Farmers' Conference 1975

    Coop, I. E.

    Book
    Lincoln University

    The published proceedings of the 25th Lincoln College Farmers' Conference, held in 1975.

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  • Effect of in vitro manipulation of pH on magnesium solubility in ruminal and caecal digesta in sheep

    Dalley, D. E.; Isherwood, P.; Sykes Andrew, R.; Robson, A. B.

    Book
    Lincoln University

    Rumen and caecal digesta were collected, under anaesthetic, from eight sheep offered either hay, pelleted concentrate or pasture at the Johnston Memorial Laboratory, Lincoln University during 1991. Subsamples of digesta were incubated at 39°C for 1 h after adjustment of pH within the range 0.5-12 by the addition of H₂S0₄ or NaOH. The samples were centrifuged at 30 000 g for 30 min and magnesium (Mg) concentration measured in the 30 000 g supernatant fraction and in total digesta to assess Mg solubility. In rumen digesta Mg solubility declined from 0.86 at pH 5 to 0.30 at pH 7 and differences in response between diets were small. Magnesium solubility in caecal digesta was generally higher than in ruminal digesta, and particularly at pH values > 6. At pH 7 the difference was twofold. Moreover, differences were observed between diets in the rate of decline in solubility in caecal digesta with increasing pH. At pH 5, 0.90 of Mg from hay and concentrate diets was soluble compared with only 0.8 for pasture. At pH 7 Mg solubility in caecal digesta from hay and concentrate fed animals was almost double that from pasture fed animals (0.64 and 0.62 v. 0.36, respectively). The implications of the findings for Mg homoeostasis in ruminants are discussed.

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  • Study of Mode-I and Mixed-Mode fracture in wood using digital image correlation method

    Samarasinghe, S.; Kulasiri, D.; Nicolle, K.

    Book
    Lincoln University

    This paper presents results of an investigation conducted to study displacement and strain field surrounding a crack tip in timber in tension using the Digital Image Correlation (DIC) technique. Opening mode fracture was studied with a crack parallel and perpendicular to grain and mixed-mode fracture was studied with a crack parallel to grain but located 30⁰, 45⁰, and 60⁰ with respect to the applied tensile force. Crack system was LT or TL with the thickness in the radial (R) direction. In Mode-I with a crack parallel to grain, crack tip deflection and strain concentration were clearly visible. Opening mode behaviour with crack perpendicular to grain was entirely different to that shown by a parallel to grain crack indicating a different mechanism of load transfer. Crack tip displacements were clearly visible and in some specimens strain concentrations could be identified. In mixed-mode fracture, realistic displacements parallel and perpendicular to crack were given by the DIC and normal and shear strains showed a highly irregular pattern which warrants further examination. All cracks propagated in the natural RL plane of timber.

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  • Effect of intraruminal infusion of potassium on the site of magnesium absorption within the digestive tract in sheep

    Dalley, D. E.; Isherwood, P.; Sykes Andrew, R.; Robson, A. B.

    Book
    Lincoln University

    Sixteen 2-year old female sheep were fitted with rumen and duodenal cannulae at the Johnstone Memorial Laboratory, Lincoln University during 1989-1990. They were offered, at 2 hourly intervals, a pelleted concentrate diet (900 g/day) and chaffed lucerne hay (100 g/day). In a split plot experiment they were infused, intraruminally and at four rates, with potassium (providing 16, 26, 36 or 46 g K/kg food DM/day) and magnesium (providing 1.3, 1.8, 2.3 or 3.1 g Mg/kg food DM/day) within a latin square design and with the liquid and solid phase markers ⁵¹Chromium EDTA and ¹⁴¹Cerium chloride. Net absorption of Mg before and after the duodenum was estimated from dietary intake, duodenal flow and urinary and faecal excretion of Mg. Increasing K intake resulted in a decline in net absorption of Mg from the entire digestive tract, supporting data in the literature. Increasing K intake from 16 to 46 g/kg DM decreased urinary Mg excretion by between 0.14 and 0.30 g/day, the extent of which was independent of the level of Mg intake. At high K intake Mg absorption from the rumen was reduced, the amount absorbed ranging from 0.08 g Mg/day at intakes of 1.3 g Mg/day and 16 g K/kg DM/day to 0.46 g Mg/day at intakes of 3.1 g Mg/day and 16 g K/kg DM/day. However, at high K intake, and when Mg absorption from the rumen was reduced, net Mg absorption from sites distal to the rumen was increased to an extent which suggested compensatory absorption. Increase in K intake was associated with a consistent reduction in plasma Mg concentration which was independent of Mg intake. Increases in Mg intake resulted in increases in Mg absorption and plasma Mg concentration at all rates of K intake in direct proportion to rate of intake. The reduction in Mg absorption from the rumen at high K intake was associated with an increase (0.3 units) in pH of rumen digesta.

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  • Captive breeding of Wellington speargrass weevil

    Emberson Rowan, M.; Scott, R. R.; Pawson Stephen, M.

    Book
    Lincoln University

    This project was initiated in May 1999 with the aim of determining optimum rearing conditions to breed Lyperobius huttoni in captivity. The programme has been relatively unsuccessful with only a single individual reared in captivity during 2001. However, some highly relevant information has been accumulated over the last three years and is summarised in this report.

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  • Visualisation techniques for collaborative GIS browsers

    Churcher Neville; Prachuabmoh Parames; Churcher Clare

    Book
    Lincoln University

    Visual information overload is a serious problem for users of geographic information systems (GIS), or other applications with complex displays, where the requirements of access to both local detail and wider context conflict. This problem is compounded for users of real-time groupware applications by the need to maintain awareness information about other users and their actions. In this paper, we describe our use of fisheye views to assist with visual information overload management in GroupARC, a lightweight real-time groupware application for browsing and annotating GIS data.

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  • End user computing at Lincoln University: an observational study of former students

    McLennan Theresa; Churcher Clare; Clemes Sue

    Book
    Lincoln University

    Increasingly end users in organisations are having to become more responsible for their own computing. Many of their applications are developed using standard business packages, especially spreadsheets and database managers, rather than being produced as customised software in a traditional 3GL. Typically,in a university curriculum, application software is only addressed in first year, introductory computing papers. In 1990, a 200 level paper ""Problem Solving on Microcomputers"" was introduced at Lincoln University. This was followed two years later with a 300 level paper, ""Advanced End User Computing"". To help with assessing the usefulness of these papers and to gain input on how the curriculum should evolve, a survey of former students was undertaken in 1996. This report contains the results of that survey.

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  • A GIS based walkway management system

    Avery, M.; Clements, R.; Harrison, G.; Hughey, K. F. D.; Thompson, M.

    Book
    Lincoln University

    The Walkway Management System (WMS) uses geographic information system (GIS) software to calculate an estimate for the level of maintenance required for walkway segments. It then assists the user in prioritising the maintenance on segments of the walkway that require repair. The development of the WMS is a cooperative effort between a team of researchers at Lincoln University and Department of Conservation (DoC) staff. DoC staff provided guidance and data, and the Lincoln University research team has implemented the system in Arc/Info software. This paper provides an analysis of the walkway maintenance problem and an overview of a GIS application developed for use as an applied tool for resource management.

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  • Introductory programming at Lincoln: attributes of successful students

    Young Jim; McLennan Theresa; Johnson Peter; Hutchison Debby; Clemes Sue

    Book
    Lincoln University

    In 1994, the introductory programming class at Lincoln University, New Zealand was surveyed, and logistic and ordinal regression models were used to determine the student attributes associated with achievement. Students who intended to major in computing were more likely to achieve than those with other intentions, and older students were more likely to achieve than younger students. Other factors such as gender, previous exposure to computing at a tertiary level, previous tuition in English, experience in programming and experience with computers in general, all had no apparent association with achievement. Female students had a lower pass rate than males but this was because a smaller proportion of females intended to major in computing.

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  • An exploration of a stochastic model of solute transport

    McKinnon Alan, E.; Kulasiri Don

    Book
    Lincoln University

    A model of groundwater solute transport is being developed by Don Kulasiri (Kulasiri, 1997). This is part of a larger project being undertaken by Lincoln Environmental. In the model, the velocity of the water in the porous media has a component which is dependent on piezometric head according to Darcy’s law, and a random component. The latter represents the variation which has been observed and which is assumed to be due to the porous media. The model also represents the diffusive process experienced by the solute in both a deterministic (Fick’s law) and random manner. Thus we have a model which comprises stochastic partial differential equations in 3 dimensions. The difficulty confronted by the model developer is how to get a good understanding of the behaviour of the model and thus have more confidence that it is working as expected. This short paper describes some attempts to visualise the behaviour of this model and shows how some inadequacies in its early implementation were discovered and a better understanding of the model’s behaviour was obtained.

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  • Fracture toughness of wood based on experimental near-tip displacement fields and orthotropic theory

    Samarasinghe, S.; Kulasiri, D.

    Book
    Lincoln University

    Fracture toughness of New Zealand Pinus radiata in TL opening mode was determined from the displacement fields obtained from digital image correlation for about 400 data points within a 7x9 mm² area in front of the tip in conjunction with orthotropic fracture theory. Representative material properties obtained experimentally were used in the theoretical formulae. There was a significant correlation between theory and experiments. Stress intensity factor thus obtained increases nonlinearly with applied load and was consistently higher than that obtained from standard formula revealing a much larger correction factor than that given in handbooks. Fracture toughness obtained from the developed relationship showed a tendency to vary under the combined influence of density and crack angle to RL plane in a nonlinear manner. A relationship was also found to express the combined influence of density and grain angle on the Young's modulus (EL), measured from bending specimens corresponding to fracture specimens. The latter relationship can be used to simulate EL and obtain a simplified expression for fracture toughness in terms of density and crack angle to RL plane.

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  • Displaying cache information in the JADE object oriented distributed processing system

    McKinnon Alan, E.; Jarquin Roger

    Book
    Lincoln University

    One of the major factors affecting the performance of any distributed processing system is the management of the cache in the local workstation. JADE is an object oriented distributed processing system developed by Aoraki Corporation of Christchurch, New Zealand. JADE uses a fully object model both for its underlying database and its development environment. Much of JADE is itself written in the JADE language. A distributed transaction processing system such as JADE must on the one hand provide for full data integrity using appropriate locking and database management techniques and on the other hand ensure that local cache is managed in such a way that users experience the best performance possible and the network is not unduly loaded. This is made more complex because the flexibility of JADE means that application code (methods) can run on either the client or the server depending on where the developer perceives it will run more efficiently. The basic unit of caching in JADE is an individual object. Each object occupies a buffer in the cache memory. At present JADE uses a “least recently used” (LRU) cache-ordering algorithm (Stallings, 1993, p. 163) in which the last cache buffer referenced is placed at the top of the cache. When space is required for a new buffer those at the bottom are displaced first. This paper is an initial attempt at providing a visual description of the arrangement of objects in the cache, based on snapshots of cache information taken while a JADE application is run.

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  • A decision support system for determining newspaper press layout configurations

    Prachuabmoh Parames; Churcher Clare; McKinnon Alan, E.

    Book
    Lincoln University

    In recent years, the demand for colour in newspaper production has increased considerably as newspaper readers and advertisers expect more extensive use of colour in the illustration of papers. A newspaper printing press consists of many different physical components. The way that these are set up, a newspaper press layout configuration, determines the attributes of the newspaper: paper size, number of sections, section sizes, and the position of colour pages. The number of possible newspaper press layout configurations is very large and to determine a press layout configuration to match a specific newspaper requirement is a very complex procedure. This report summarises how the newspaper layout configuration affects the attributes of a newspaper and describes two applications Threading and Layout, which have been developed as decision support tools to generate all possible newspaper layout configurations.

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