6,540 research outputs found
Jones, D.S.
No full textCarte de Visite of Lieutenant D.S. Jones, Company D, 13th Maine Infantry; From the Maine State Archives Collectionhttps://digitalmaine.com/arc_civilwarportraits/1374/thumbnail.jp
Jones, D.S.
No full textCarte de Visite of Lieutenant D.S. Jones, Company D, 13th Maine Infantry; From the Maine State Archives Collectionhttps://digitalmaine.com/arc_civilwarportraits/1374/thumbnail.jp
NOC Liverpool report for the Wirewalker underwater profiler deployment for the RidgeMix research programme
No full textThis report provides a review of a ‘wirewalker’ underwater profiler that was used for high resolution water quality and turbulence measurements as part of a mid-Atlantic ocean based scientific survey. The profiler utilised wave energy and buoyancy to generate automated, cyclic underwater vertical measurements. A drifting supporting surface buoy and mooring configuration was used that moved horizontally in response to underwater currents, surface wind and waves, while generating repeated sub-surface vertical scientific measurements.The profiler instrumentation payload included a high-resolution chlorophyll-a fluorimeter, a fast sampling, precision conductivity, temperature and depth sensor (CTD) and a fragile, high resolution oceanic microstructure and turbulence sensor. A bespoke guard was used to help protect the fragile microstructure and turbulence sensors from damage. The mooring surface buoy instrumentation included telemetered GPS at nominally 30 minute intervals, a backup telemetered position indication, a VHF radio beacon based position locator and a solar powered night time light.The experiment was designed to resolve time-variability of upper-ocean mixing and chlorophyll-a fluorescence over the Mid-Atlantic underwater Ridge, an internal wave generation hotspot. Typically more than three wave driven descents to 200 metres and subsequent buoyancy driven ascents to close to the sea surface were achieved per hour during a 22 day deployment, whilst continuously sampling. This represents the first time the UK National Oceanography Centre (NOC) have used this type of underwater profiling system for high resolution oceanic microstructure and turbulence measurements to support a scientific campaign.Information to support a series of developing operational best practices for the use of this delicate and precision sensing arrangement with a wirewalker underwater profiler is provided. Recommendations relating to the future development of this versatile measurement system are also discussed
Lives and limbs : re-membering Robert Jones : a biography
No full textThis is a biography of Robert Jones, 1857-1933. He was a surgeon, and is credited
with bringing orthopaedics from its quack past into its scientific present. This work
explores Jones’ life and times, and examines whether he is entitled to the epithet
‘father of orthopaedics’.
It looks at the history of bonesetting, the influences on Jones’ development
and medical training, and some key moments in his career – notably his involvement
in the building of the Manchester Ship Canal, the planning of Heswall Children’s
Hospital, and the Great War. It argues that although there are other medical men
who could have been credited with fathering orthopaedics, he is indeed the father –
at least of orthopaedics in Britain, if not internationally.
This version of Jones’ life begins with something of his biographer’s journey,
before it explores what and who influenced Jones, and in turn what his legacy has
been to the medical profession.
The accompanying Critical Commentary explores whether or not it is possible
to offer a definition of biography as a genre in the light of its history and purpose. It
examines critical views, considers the mythology that grows up around historical
figures, and also explains the rationale for the structure chosen for organising the
material presented in this new biography of Robert Jones, Live and Limbs: Re-membering Robert Jones
Single-frequency operation of a monolithic Nd:glass ring laser via the acousto-optic effect
No full textA monolithic laser fabricated from Nd-doped phosphate glass is described in which unidirectional and hence single-frequency operation is enforced by the acousto-optic effect in the laser medium. Reliable single-frequency output could be maintained indefinitely with an applied radio-frequency power of 0.2 W. Output powers up to 30 mW for 400 mW of pump power have been achieved
Unidirectional Nd-doped phosphate glass ring laser using the acousto-optic effect in the laser medium
No full textEnforcing unidirectional operation of a ring laser using an intracavity travelling-wave acousto-optic (A-O) modulator can be an effective way to achieve both efficient and reliable single frequency operation. Recently, it has been shown that there are two distinct mechanisms which are responsible for the non-reciprocal behaviour of a travelling-wave A-O modulator, and in both cases it has been demonstrated that a sufficient value of loss difference to ensure unidirectional operation can be achieved at very low r.f. powers. This fact suggests that many laser materials, not previously noted as having a high enough figure of merit for many acousto-optic applications, may nevertheless prove to have a more than adequate figure of merit for A-O unidirectional devices
The biomechanics of the anterior cruciate ligament and its reconstruction
No full textChristopher D.S. Jones and Paul N. Grimsha
Acousto-optically induced single-frequency operation of a monolithic Nd:phosphate glass ring laser
No full textA diode-pumped single-frequency monolithic Nd:phosphate glass ring laser is described, in which the acousto-optic effect is used to enforce unidirectional lasing. Output powers up to 30mW for 400mW of pump have been achieved
Single-frequency Nd-doped phosphate glass ring laser using the acousto-optic effect in the laser medium
No full textEnforcing unidirectional operation of a ring laser using an intracavity travelling-wave acousto-optic (A-O) modulator can be an effective way to achieve both efficient and reliable single-frequency operation. This technique offers significant advantages over the traditional Faraday isolator approach since it does not rely on polarization discrimination and requires only one extra intracavity component. This renders the technique extremely well suited for use in low gain miniature laser systems, such as diode- pumped solid-state lasers
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