175,063 research outputs found
The Kerr-Schild ansatz revised
No full text Kerr–Schild metrics have been introduced as a linear superposition of the flat spacetime metric and a squared null-vector field, say k, multiplied by some scalar function, say H. The basic assumption which led to Kerr solution was that k be both geodesic and shearfree. This condition is relaxed here and Kerr–Schild Ansatz is revised by treating Kerr–Schild metrics as exact linear perturbations of Minkowski spacetime. The scalar function H is taken as the perturbing function, so that Einstein's field equations are solved order-by-order in powers of H. It turns out that the congruence must be geodesic and shearfree as a consequence of third- and second-order equations, leading to an alternative derivation of Kerr solution. </jats:p
Review of "Locating Milton: Places and Perspectives" y Jason A. Kerr.
No full textThomas Festa and David Ainsworth, eds. Locating Milton: Places and Perspectives. Clemson, SC: Clemson University Press, 2021. x + 231 pp. + 8 illus. $120. Review by Jason A. Kerr, Brigham Young University
Kerr, R A, 409144
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/396978Surname: KERR. Given Name(s) or Initials: R A. Military Service Number or Last Known Location: 409144. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 49414.234097
Item: [2016.0049.29271] "Kerr, R A, 409144
Kerr-microresonator solitons from a chirped background
No full textWe demonstrate protected single-soliton formation and operation in a Kerr microresonator using a phase-modulated pump laser. Phase modulation gives rise to spatially varying effective loss and detuning parameters, which in turn lead to an operation regime in which multi-soliton degeneracy is lifted and a single soliton is the only observable behavior. Direct excitation of single solitons is indicated by observed reversal of the characteristic 'soliton step.' Phase modulation also enables precise control of the soliton pulse train's properties, and measured dynamics agree closely with simulations. We show that the technique can be extended to high repetition-frequency Kerr solitons through subharmonic phase modulation. These results facilitate straightforward generation and control of Kerr-soliton microcombs for integrated photonics systems
Resources: YouTube Videos and the JELCKC Website and Archive
No full textAdditional resources to support the content in Best Practice Protocols for Physique Assessment in Sport are available at the J.E. Lindsay Carter Kinanthropometry Clinic and Archive (JELCKCA) website jelckca-bodycomp.com, which links you to the YouTube channel http://tinyurl.com/YouTubeChannel-ProfPatria. YouTube videos include introduction of experts and their background in physique assessment, demonstration of physique assessment procedures and commentary from experts on issues related to physique assessment. The physical kinanthropometry archive is located at the Auckland University of Technology Millennium precinct in Auckland, New Zealand
Kerr, J R, NX49191
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/396992Surname: KERR. Given Name(s) or Initials: J R. Military Service Number or Last Known Location: NX49191. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 18010.234125
Item: [2016.0049.29285] "Kerr, J R, NX49191
Kerr, R J, 21529
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/396965Surname: KERR. Given Name(s) or Initials: R J. Military Service Number or Last Known Location: 21529. Missing, Wounded and Prisoner of War Enquiry Card Index Number: SEA-1593.234071
Item: [2016.0049.29258] "Kerr, R J, 21529
Kerr, R C, NX5998
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/396995Surname: KERR. Given Name(s) or Initials: R C. Military Service Number or Last Known Location: NX5998. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 3942.234131
Item: [2016.0049.29288] "Kerr, R C, NX5998
Kerr, R, Singapore
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/397006Surname: KERR. Given Name(s) or Initials: R. Military Service Number or Last Known Location: SINGAPORE. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 19973.234153
Item: [2016.0049.29299] "Kerr, R, Singapore
Magneto–Optical Kerr Effect Microscopy Investigation on Permalloy Nanostructures
No full textThis thesis focuses on the investigation of magnetic domains in ultrasmall permalloy (Ni80Fe20) structures down to nanometre size. Magnetic domains and domain walls in nano objects are often observed using a very high resolution and high power microscope such as magnetic soft x-ray microscope, magnetic force microscopy imaging and photoemission electron microscopy. A reason for this is because the Kerr signal in nanostructures is very weak. However the results from this thesis demonstrate that magnetic domains in permalloy magnetic nanostructures can still be observed with very good contrast using a Magneto-optical Kerr effect (MOKE) microscope. The constructed Kerr microscope is a home-build wide field microscope and is able to produce magnetic domains image of permalloy nanowire as small as 245 nm, although the resolution limit of the microscope is 505 nm. For the first time, a magnetic domain in nanowire with width of 245 nm is observed using a wide-field microscope. The combination of hysteresis loops and magnetic domains observations for studying a magnetic sample provides a three-dimensional understanding of the magnetic characteristic of the sample. This is crucial in investigating nano samples as the theoretical arguments with the experimental results are always constrained by the experimental part. Three kinds of nanostructure sample were observed using the Kerr microscope; a cross nanowire, zigzag nanowire and a nanowire with notch and a nucleation pad at one end. It was found that a cross nanowire can form magnetic domains upon reversal and the junction forms a magnetisation vortex. Findings from zigzag nanowire demonstrate a complex, multiple magnetic domains formation upon magnetisation reversal. A weak domain wall pinning effect was observed in the nanowire, causing a multiple domains formation in the nanowire upon reversal. It can be confirmed that this effect was caused by the high coercivity of the nucleation pad. For the nanowire with notch, it was demonstrated that the coercivities were different at negative and positive field. But for such case, there is a relationship observed between the percentage notch depth and the coercivity at the junction
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