3,272 research outputs found

    Fatigue strength of mortise and tenon furniture joints made from oil palm lumber and some Malaysian timbers.

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    A study was undertaken to evaluate comparative bending and fatigue strengths of rectangular mortise and tenon furniture joints made from oil palm (Eleais guineensis) lumber against a few established furniture wood materials. This is owing to the fact that, although the rectangular mortise and tenon joints are the most commonly joints used in chair construction, studies on its strength under cyclic loading is very limited. The fact that furniture joints are the weakest link in the furniture structure, it is necessary to establish its strength performance especially under repeated loading as experienced by the chair in service. The results showed that the bending strength of the oil palm lumber joints were half the strength of the wooden joints. However, in terms of fatigue strength, joints made from oil palm lumber showed comparable performance with the other wood materials. The results also showed that the allowable design stresses for rectangular mortise and tenon joints could be set at 20% of its bending strength. This study has far reaching implications on furniture engineering as it suggest that proper joint design is mandatory not only to ensure the furniture’s reliability in service, but also improve its aesthetic and production imperatives

    Managing change in Alma: Do monthly updates matter?

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    Alma currently is updated every month, a break from the more traditional quarterly releases of most major library systems. This presentation takes a look at how libraries are handling the change month to month and examines the highs and lows of working with a new schedule for software updates. It also looks at specific issues libraries face with updates to Alma

    Analysis of Time-Independent Consolidation Data

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    The one-dimensional laboratory consolidation test developed by Terzaghi permits deformation and drainage only in the vertical direction. The stress-strain characteristics of data obtained from this test are normally studied using a semilogarithmic graphical representation, that is, vertical strain or void ratio is plotted as a function of the logarithm of effective stress. Such a representation permits an analysis of the stress history and compressibility characteristics of soils. Knowledge of these material characteristics is of great practical value in the prediction of settlement associated with loading where the effects of lateral consolidation may be neglected

    Making waves: Library IT as a disruptive force

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    This presentation addresses special challenges and opportunities that Library IT departments face as they take a larger role in initiating change within an organization

    Security in Integrated Library Systems

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    A case study of securing enterprise systems, using library software as an example. Areas including best practices, layered responsibility, regulatory compliance, and functionality are addressed

    Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3

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    Funding for this research was provided by: EPSRC (award No. EP/L505079/1).We demonstrate the existence of a novel phase transition sequence in the perovskite Li0.2Na0.8NbO3 at elevated temperature. The rare Glazer tilt system, a+a+c-, is observed in both polar and centrosymmetric polymorphs. The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150 – 300 °C; these two phases correspond to Glazer tilt systems a-a-a- and a+a+c-, respectively. At 500 °C a ferroelectric – paraelectric transition takes place from P42mc to P42/nmc, retaining the a+a+c- tilt. Transformation to a single-tilt system, a0a0c+ (space group P4/mbm), occurs at 750 °C, with the final transition to the aristotype cubic phase at 850 °C. The P42mc and P42/nmc phases have each been seen only once previously in perovskite crystallography, in both cases in compositions prepared at high pressure.Publisher PDFPeer reviewe
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