1,689 research outputs found

    Leap of Death

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    ‘Leap of Death’ is collaborative, multi-media project by composer Robert Stillman, artist Anna Fewster, and bookbinder Sarah Bryant. It seeks to interpret archival material for the ‘lost’ 1929 F.W. Murnau film ‘4 Devils’. The main output of the project is a limited edition of 50 bookwork/LP’s that use letterpress text, trace-monotype print images, and recorded music to construct an abstract, non-linear ‘impression’ of the film’s narrative. The project also included a ‘live’ version of this work using projections of the bookwork text and imagery, and performance of the music by the ensemble The Archaic Future Players. The wider research questions for this project include: • Can archival research be carried out and disseminated as contemporary artistic/creative work? What is distinctive about such an approach (compared, for example, to scholarly research). • How can creative content (i.e. narrative) in one form, like film, be translated into, or indeed extended by, other forms like still image, text, and music? • How can ‘traditional’ media like slideshows, live/recorded music, or books present narrative structure in an ‘open’ (i.e. non-linear way?) • How can a digital format (i.e. web) most effectively represent physical media (i.e. an artist’s bookwork)

    The origin recognition complex in silencing, cell cycle progression, and DNA replication

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    This report describes the isolation of ORC5, the gene encoding the fifth largest subunit of the origin recognition complex, and the properties of mutants with a defective allele of ORC5. The orc5-1 mutation caused temperature-sensitive growth and, at the restrictive temperature, caused cell cycle arrest. At the permissive temperature, the orc5-1 mutation caused an elevated plasmid loss rate that could be suppressed by additional tandem origins of DNA replication. The sequence of ORC5 revealed a potential ATP binding site, making Orc5p a candidate for a subunit that mediates the ATP-dependent binding of ORC to origins. Genetic interactions among orc2-1 and orc5-1 and other cell cycle genes provided further evidence for a role for the origin recognition complex (ORC) in DNA replication. The silencing defect caused by orc5-1 strengthened previous connections between ORC and silencing, and combined with the phenotypes caused by orc2 mutations, suggested that the complex itself functions in both processes

    Excess noise in GaAs and AlGaAs avalanche photodiodes with GaSb absorption regions—composite structures grown using interfacial misfit arrays

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    Interfacial misfit arrays were embedded within two avalanche photodiode (APD) structures. This allowed GaSb absorption layers to be combined with wide-bandgap multiplication regions, consisting of GaAs and Al0.8Ga0.2As, respectively. The GaAs APD represents the simplest case. The Al0.8Ga0.2As APD shows reduced dark currents of 5.07 μAcm−2 at 90% of the breakdown voltage, and values for effective below 0.2. Random-path-length modeled excess noise is compared with experimental data, for both samples. The designs could be developed further, allowing operation to be extended to longer wavelengths, using other established absorber materials which are lattice matched to GaSb

    Aeronautic Instruments. Section IV : Direction Instruments

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    Part one points out the adequacy of a consideration of the steady state gyroscopic motion as a basis for the discussion of displacements of the gyroscope mounted on an airplane, and develops a simple theory on this basis. Principal types of gyroscopic inclinometers are described and requirements stated. Part two describes a new type of stabilizing gyro mounted on top of a spindle by means of a universal joint, the spindle being kept in a vertical position by supporting it as a pendulum of which the bob is the driving motor. Methods of tests and the difficulties in designing a satisfactory and reliable compass for aircraft use in considered in part three. Part four contains a brief general treatment of the important features of construction of aircraft compasses and description of the principal types used
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