Bibliographies thématiques / Polarised-nuclei

Littérature scientifique sur le sujet « Polarised-nuclei »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Polarised-nuclei"

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Kudryavtsev, I. N., et A. P. Soznik. « Elastic intermediate-energy proton scattering by polarised nuclei ». Journal of Physics G : Nuclear and Particle Physics 15, no 9 (1 septembre 1989) : 1377–95. http://dx.doi.org/10.1088/0954-3899/15/9/008.

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Glättli, Hans. « Polarised nuclei for neutron science : recent applications and perspectives ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 529, no 1-3 (août 2004) : 194–98. http://dx.doi.org/10.1016/j.nima.2004.04.156.

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Lampard, GJ, HH Bolotin, AE Stuchbery, CE Doran et AP Byrne. « Systematics of Gyromagnetic Ratios of the 21+ States in Even Ge Isotopes ». Australian Journal of Physics 40, no 2 (1987) : 117. http://dx.doi.org/10.1071/ph870117.

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The relative gyromagnetic ratios of the 2t states in 70,72,74,76Ge were measured simultaneously by me ns of the thin-foil, perturbed y-r yngular distribution technique utilising the transient hyperfine field manifest t nuclei of Ge ions rapidly traversing polarised Fe. The states of interest were Coulomb excited using 75-MeV 34S projectiles incident upon natural element l Ge t rget. The present results re comp red with previously reported measurements and collective model expectations.
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Court, G. R., et W. G. Heyes. « The polarisation of 14N and 15N nuclei in polarised proton targets using irradiated ammonia ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 243, no 1 (février 1986) : 37–40. http://dx.doi.org/10.1016/0168-9002(86)90818-1.

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O’Connor, Eoin G. P., Andrew Shearer, Christian Gouiffes et Philippe Laurent. « High Time Resolution Astronomical Polarimetry with GASP ». Proceedings of the International Astronomical Union 13, S337 (septembre 2017) : 384–85. http://dx.doi.org/10.1017/s1743921317010626.

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AbstractThe Galway Astronomical Stokes Polarimeter (GASP) is a high time resolution, full-Stokes imaging polarimeter which utilises a Fresnel rhomb prism as a beam-splitter and quarter wave retarder. The ability to perform optical photometry and polarimetry at high frame rates enables more detailed studies of a multitude of compact objects including; optical pulsars, magnetars and Active Galactic Nuclei (AGN). We present a brief discussion of the instruments’ current capabilities and hardware design. GASP is currently configured with two Electron Multiplying Charge-Coupled Devices (EMCCDs), which offer sub-millisecond frame readout speeds over a defined region of interest on the sensor. We will report results from an observational campaign at the William Herschel Telescope (WHT) in December, 2015. During this campaign GASP was used to study the Crab Pulsar, V404 Cygni and polarisation standards. As a subset of our analysis we have identified a significant contribution from the Interstellar Medium (ISM) and the interaction of a varying polarised source with the ISM, the subsequent conversion of linearly polarised light to circular, and its dependence on the angle of the source emission electric field orientation. Further to the presentation of results we will discuss future observational work, which is planned for September 2017 and subsequent improvements to increase the temporal resolution of the detectors.
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Shehu, D., G. Marsicano, J. E. Fléchon et C. Galli. « Developmentally regulated markers of in vitro-produced preimplantation bovine embroys ». Zygote 4, no 2 (mai 1996) : 109–21. http://dx.doi.org/10.1017/s0967199400002987.

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SummaryExpression of various developmentally regulated markers was screened throughout the preimplantation stages of in vitro-derived bovine embryos. This was done by investigating the distribution of several nuclear, cytoplasmic and extracellular proteins by means of immunofluorescence microscopy. While lamin B appeared as a constitutive component of nuclei of all preimplantation stages, lamins A/C had a stage-related distribution. The early cleavage stage nuclei contained lamins A/C which generally disappeared in the following stages, with the possible exception of a few positive nuclei in the morula and early blastocyst stage. In the expanded blastocyst stage the nuclei of trophectoderm cells became positive while no positivity was observed in the inner cell mass cells. Starting from day 6, the appearance and/or polarised distribution of various cytoskeletal and cytoskeleton-related components such as Factin, α-catenin and E-cadherin gave an insight into the timing of events related to compaction of bovine e bryos. Compaction was correlated with the first differentiation event, i.e. the formation of trophectoderm; this is the first embryonic epithelium, characterised by cytokeratins and desmoplakin. Extracellular fibronectin was first detected in the early blastocyst stage shortly before the morphological differentiation of primitive endoderm, and in the later stages it was localised at the interface between trophectoderm and extraembryonic endoderm. Laminin and collagen IV were expressed by the endoderm cells and contributed to the extracellular matrix underlying the trophectoderm. This study is a first attempt to characterise the cells of in vitro-derived bovine embryos valid for cell line derivation.
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KISELEV, J. F., A. F. PRUDKOGLYAD, A. S. SHUMOVSKY et V. I. YUKALOV. « DISCOVERY OF DICKE SUPERRADIATION BY SYSTEM OF NUCLEAR MAGNETIC MOMENTS ». Modern Physics Letters B 01, no 11n12 (février 1988) : 409–16. http://dx.doi.org/10.1142/s021798498800148x.

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Spontaneous generation of the Dicke superradiation (SR) state has been found in the system of inversely polarised proton spins with “frozen” polarisation. SR is observed at the moment when the Larmor frequency crosses the resonance frequency of the passive oscillatory circuit. SR arises from incoherent maser generation of spins. The frequency of a SR generator can be retuned from several hundreds of kilohertz to hundreds of megahertz at very low temperatures. Dependence of incoherent and coherent radiation on the initial polarisation has been investigated. A radio frequency analogue of the optical SR laser is shown to be possible both for weak-amplifying and for strong-amplifying active media, depending on the factor of filling and polarisation of nuclei. SR-reverse of negative polarisation is observed in the latter case.
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Adebahr, B., M. Brienza et R. Morganti. « Polarised structures in the radio lobes of B2 0258+35 ». Astronomy & ; Astrophysics 622 (février 2019) : A209. http://dx.doi.org/10.1051/0004-6361/201833988.

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Context. The contribution of active galactic nuclei to the magnetisation of the Universe can be constrained by knowing their duty cycles, jet and magnetic field morphologies, and the physical processes dominating their interaction with the surrounding environment. Aims. The magnetic field morphology and strength of radio lobes of AGN has an influence on the mechanisms for the propagation of cosmic rays into intergalactic space. Using the source B2 0258+35 we want to investigate the interaction of its radio lobes with the surrounding environment and examine the underlying physical effects. Methods. Published H I and radio continuum data at λ21 cm were combined with newly reduced archival Westerbork Radio Synthesis Telescope polarisation data at the same wavelength to investigate the polarised emission in the radio lobes of B2 0258+35. We assumed energy equipartition between the cosmic rays and the magnetic field to calculate their pressure and investigate the physical processes leading to the detected emission. Results. We detected a unique S-shaped diffuse polarised structure. The lobes have a pressure of p = 1.95 ± 0.4 × 10−14 dyn cm−2. The calculated total magnetic field strengths are low (Beq = 1.21 ± 0.12 μG). We observe depolarisation in the northern lobe, which might originate from the H I-disc in the foreground. In addition we see an anti-correlation between the pressure and the fractional polarisation along the S-shaped structure. Therefore we consider magnetic draping and magnetic field compression as possible effects that might have created the observed S-shape. Conclusions. Our results suggest that magnetic draping can be effectively used to explain the observed polarised structures. This is likely due to the combination of a relatively low magnetic field strength, enabling super-Alfvénic motion of the rising lobes (with MA = 2.47 − 3.50), and the coherency of the surrounding magnetic field. Moreover, the draped layer tends to suppress any mixing of the material between the radio lobes and the surrounding environment, but can enhance the mixing and re-acceleration efficiencies inside the lobes, providing an explanation for the average flat spectral index observed in the lobes.
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Catoira, R., A. C. Timmers, F. Maillet, C. Galera, R. V. Penmetsa, D. Cook, J. Denarie et C. Gough. « The HCL gene of Medicago truncatula controls Rhizobium-induced root hair curling ». Development 128, no 9 (1 mai 2001) : 1507–18. http://dx.doi.org/10.1242/dev.128.9.1507.

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The symbiotic infection of the model legume Medicago truncatula by Sinorhizobium meliloti involves marked root hair curling, a stage where entrapment of the microsymbiont occurs in a chamber from which infection thread formation is initiated within the root hair. We have genetically dissected these early symbiotic interactions using both plant and rhizobial mutants and have identified a M. truncatula gene, HCL, which controls root hair curling. S. meliloti Nod factors, which are required for the infection process, induced wild-type epidermal nodulin gene expression and root hair deformation in hcl mutants, while Nod factor induction of cortical cell division foci was reduced compared to wild-type plants. Studies of the position of nuclei and of the microtubule cytoskeleton network of hcl mutants revealed that root hair, as well as cortical cells, were activated in response to S. meliloti. However, the asymmetric microtubule network that is typical of curled root hairs, did not form in the mutants, and activated cortical cells did not become polarised and did not exhibit the microtubular cytoplasmic bridges characteristic of the pre-infection threads induced by rhizobia in M. truncatula. These data suggest that hcl mutations alter the formation of signalling centres that normally provide positional information for the reorganisation of the microtubular cytoskeleton in epidermal and cortical cells.
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Pisano, G., A. Ritacco, A. Monfardini, C. Tucker, P. A. R. Ade, A. Shitvov, A. Benoit et al. « Development and application of metamaterial-based half-wave plates for the NIKA and NIKA2 polarimeters ». Astronomy & ; Astrophysics 658 (27 janvier 2022) : A24. http://dx.doi.org/10.1051/0004-6361/202038643.

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Context. Large field-of-view imaging and polarimetry instruments operating at millimetre and sub-millimetre wavelengths are fundamental tools to understand the role of magnetic fields in channelling filament material into prestellar cores, providing unique insight in the physics of galactic star-forming regions. Among other topics, at extra-galactic scales, polarisation observations of Active Galactic Nuclei (AGNs) will allow us to constrain the possible physical conditions of the emitting plasma from the jets and/or explore the physics of dust inside supernova remnants. The kilo-pixel New IRAM KIDs Array 2 (NIKA2) camera, installed today at the Institut de Radioastronomie Millimétrique (IRAM) 30-m telescope, represents one of the best tools available to astronomers to produce simultaneous intensity and polarimetry maps over large fields at 260 GHz (1.15 mm). Aims. The polarisation measurement, in NIKA and NIKA2, is achieved by rapidly modulating the total incoming polarisation. In the end, this allows one to safely isolate the small science signal from the large, un-polarised, and strongly variable, atmospheric background. Methods. The polarisation modulation is achieved by inserting a fast rotating half-wave plate (HWP) in the optical beam. In order to allow wide field-of-view observations, the plate has to be large, with a diameter of 250 mm. The modulation of the polarised signal at 12 Hz also requires the waveplate to be sufficiently light. In addition, this key optical element has to exhibit optimal electromagnetic characteristics in terms of transmission and differential phase-shift. For this purpose, three metamaterial HWPs have been developed using the mesh-filter technology. The knowledge acquired in developing the first two single-band HWPs was used to achieve the more challenging performance requirements of the last dual-band HWP. The first and the third waveplates met the requirements for both the NIKA and NIKA2 instruments. Results. We first illustrate the design, the technical developments, the fabrication, and laboratory characterisation of the three mesh-HWPs. The deployment of two such elements in the NIKA and NIKA2 instruments at the 30-metre telescope is then described. We conclude with representative examples of astrophysical maps integrating polarimetry.
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Thèses sur le sujet "Polarised-nuclei"

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Richards, Philip. « New methods in the study of polarised radioactive nuclei ». Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334880.

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Savaloni, Hadi. « Elastic scattering of 3.0 MeV polarised neutrons by medium mass nuclei ». Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/11370.

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Piegsa, Florian Michael [Verfasser]. « Neutron spin precession in samples of polarised nuclei and neutron spin phase imaging / Florian Michael Piegsa ». 2009. http://d-nb.info/996056564/34.

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Livres sur le sujet "Polarised-nuclei"

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Karban, Oldrich. Interaction of polarised ions with nuclei. Birmingham : University of Birmingham, 1992.

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Farooq, Amjad. Scattering of polarised helium-3 by nuclei. Birmingham : University of Birmingham, 1985.

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Chapitres de livres sur le sujet "Polarised-nuclei"

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Close, F. E. « Parton Distributions in Nuclei and Polarised Nucleons ». Dans QCD Hard Hadronic Processes, 253–63. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-8842-5_22.

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Actes de conférences sur le sujet "Polarised-nuclei"

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YERSHOV, A. A., V. A. BODIAGIN, N. A. KRUGLOV, A. A. POPEKO, L. I. SARYCHEVA, A. G. LITVINENKO, V. P. LADYGIN et al. « EXPERIMENTAL INVESTIGATION OF THE QUASIELASTIC SCATTERING OF POLARISED PROTONS ON NUCLEI AT THE JINR VB LHE SYNCHROPHASOTRON ». Dans Proceedings of the 16th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701909_0130.

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