2,789 research outputs found
Batchelor A/D [cartographic material].
No full textAerodrome.; Catalogue record generated as part of a batch load.; Flight diagram available in: online, print.; National Library flight diagram only available in an electronic version via the Internet at: http://nla.gov.au/nla.map-vn5012040. Date flown: 18/8/1942, flight no.: 256-6, no. of run: [no run number on photo], print range: 591-605.Batchelor aerodrom
Bachelor A/D [i.e. Batchelor] [cartographic material].
No full textAerodrome.; Catalogue record generated as part of a batch load.; Flight diagram available in: online, print.; National Library flight diagram only available in an electronic version via the Internet at: http://nla.gov.au/nla.map-vn5012037. Date flown: 18/5/1949, flight no.: 87SQ/42, no. of run: [no run number on photo], print range: 5001-5008.Bachelor aerodrome [i.e. Batchelor
Kraichnan-Leith-Batchelor similarity theory and two-dimensional inverse cascades
No full textWe study the scaling properties and Kraichnan-Leith-Batchelor (KLB) theory of forced inverse cascades in generalized two-dimensional (2D) fluids (-turbulence models) simulated at resolution . We consider (surface quasigeostrophic flow), (2D vorticity dynamics) and . The forcing scale is well-resolved, a direct cascade is present and there is no large-scale dissipation. Coherent vortices spanning a range of sizes, most larger than the forcing scale, are present for both and . The active scalar field for contains comparatively few and small vortices. The energy spectral slopes in the inverse cascade are steeper than the KLB prediction in all three systems. Since we stop the simulations well before the cascades have reached the domain scale, vortex formation and spectral steepening are not due to condensation effects; nor are they caused by large-scale dissipation, which is absent. One- and two-point pdfs, hyperflatness factors and structure functions indicate that the inverse cascades are intermittent and non-Gaussian over much of the inertial range for and , while the inverse cascade is much closer to Gaussian and non-intermittent. For the steep spectrum is close to that associated with enstrophy equipartition. Continuous wavelet analysis shows approximate KLB scaling () and () in the interstitial regions between the coherent vortices. Our results demonstrate that coherent vortex formation ( and ) and non-realizability () cause 2D inverse cascades to deviate from the KLB predictions, but that the flow between the vortices exhibits KLB scaling and non-intermittent statistics for and . The results will appear in \cite{BurgessEA2015}, which has been accepted to the \emph{Journal of Fluid Mechanics}
Batchelor, Northern Territory [cartographic material] /
No full textTopographic maps of the Batchelor area, Northern Territory showing roads, boundaries, vegetation, aerodromes, radio facilities, controlled airspace and obstructions. Relief shown by contours, hachures and spot heights.; Includes index to adjoining sheets.; "Emergency edition"; "L.H.Q/002/1370."; National Library of Australia's designation of sheet number: D 52 8 54. ANL; Also available online http://nla.gov.au/nla.map-vn6152582
Physiological responses of Brassica napus varieties to variable phosphorous conditions when grown in hydroponics data
No full textData on physiological characteristics of Brassica napus varieties grown under variable phosphorous conditions in a hydroponics system
Varieties A-Prince, B-Caramba, C-Gefion, D-Pacific, E-Montego, F-Musett
Steady Prandtl-Batchelor flows past a circular cylinder
No full textThe high Reynolds number flow past a circular cylinder with a trailing wake region is considered when the wake region is bounded and contains uniform vorticity. The formulation allows only for a single vortex pair trapped behind the cylinder, but calculates solutions over a range of values of vorticity. The separation point and length of the region are determined as outputs. It was found that using this numerical method there is an upper bound on the vorticity for which solutions can be calculated for a given arclength of the cavity. In some cases with shorter cavities, the limiting solutions coincide with the formation of a stagnation point in the outer flow at both separation from the cylinder and reattachment at the end of the cavity
Ultra thin and transfer tattoo UHF RFID tags
No full textThis paper describes inkjet printing as a digital fabrication tool for the manufacture of RFID tags on flexible and porous substrates (i.e. paper). The RFID tag presented is a single layer, ultrathin UHF tag in the form of a transfer tattoo, [1] which evolved from ultra-thin, substrate insensitive tag designs, [2]. Operation has been demonstrated when mounted direct on the skin with initial read ranges in the region of 1m and subsequent improvements have enabled read range increases. The implications of ink sintering processes for paper based transfer tattoos will be discussed as specifically applied to this work, [3], and resulting patch conductivities and read ranges highlighted for tags printed on tattoo transfer paper, [4]. Recent developments in selective ink layering will be outlined to illustrate the benefits to cost effective fabrication and efficient tattoo patch operation. Finally, work integrating additional components to improve transponder efficiency will be presented and leading to the concept of an ultra-thin battery for power assisted tagging where on-skin read ranges of 6m are possible. The issues for fabrication will be discussed for deposition and fabrication of such ultra-low profile sensitive tattoo tags.
1. M. Ziai and J. Batchelor, Temporary On-Skin passive UHF RFID Transfer Tag, IEEE Transactions on Antennas and Propag., 2011, 59(10), 3565.
2. M. Ziai and J. Batchelor, Thin ultra high-frequency platform insensitive radio frequency identification tags, IET Microw. Antennas Propag., 2010, vol. 4, pp. 390–398.
3. V. Sanchez-Romaguera, M.B. Madec, S.G. Yeates, Ink-jet printing of conductive polymers for smart textiles and flexible electronics. Materials Research Society Symposium Proceedings, 2009, 1192E(Materials and Devices for Flexible and Stretchable Electronics), No pp. given, Paper #: 1192-PP14-04.
4. http://www.craftycomputerpaper.co.uk/.-Inkjet-Tattoo-Paper_CPJ316I.ht
Evolution of isolated turbulent trailing vortices
No full textIn this work, the temporal evolution of a low swirl-number turbulent Batchelor vortex is studied using pseudospectral direct numerical simulations. The solution of the governing equations in the vorticity-velocity form allows for accurate application of boundary conditions. The physics of the evolution is investigated with an emphasis on the mechanisms that influence the transport of axial and angular momentum. Excitation of normal mode instabilities gives rise to coherent large scale helical structures inside the vortical core. The radial growth of these helical structures and the action of axial shear and differential rotation results in the creation of a polarized vortex layer. This vortex layer evolves into a series of hairpin-shaped structures that subsequently breakdown into elongated fine scale vortices. Ultimately, the radially outward propagation of these structures results in the relaxation of the flow towards a stable high-swirl configuration. Two conserved quantities, based on the deviation from the laminar solution, are derived and these prove to be useful in characterizing the polarized vortex layer and enhancing the understanding of the transport process. The generation and evolution of the Reynolds stresses is also addressed
Diffusiophoresis, Batchelor scale and effective Péclet numbers
No full textInternational audienceWe study the joint mixing of colloids and salt released together in a stagnation point or in a globally chaotic flow. In the presence of salt inhomogeneities, the mixing time is strongly modified depending on the sign of the diffusiophoretic coefficient D dp. Mixing is delayed when D dp > 0 (salt-attracting configuration), or faster when D dp < 0 (salt-repelling configuration). In both configurations, as for molecular diffusion alone, large scales are barely affected in the dilating direction while the Batchelor scale for the colloids, ℓ c,diff , is strongly modified by diffusiophoresis. We propose here to measure a global effect of diffusiophoresis in the mixing process through an effective Péclet number built on this modified Batchelor scale. Whilst this small scale is obtained analytically for the stagnation point, in the case of chaotic advection, we derive it using the equation of gradients of concentration, following Raynal & Gence (Intl J. Heat Mass Transfer, vol. 40 (14), 1997, pp. 3267-3273). Comparing to numerical simulations, we show that the mixing time can be predicted by using the same function as in absence of salt, but as a function of the effective Péclet numbers computed for each configuration. The approach is shown to be valid when the ratio D 2 dp /D s D c ≫ 1, where D c and D s are the diffusivities of the colloids and salt
[Letters from Citizens, Spring 1967]
No full textCorrespondence between citizens and the Dallas Police Department. Chief Charles Batchelor states in his responses that the department's policy is to express no opinion of the Warren Report and release evidence only at a court order
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