4,119 research outputs found
Detrital zircon and apatite (U‐Th)/He geochronology of intercalated baked sediments: a new approach to dating young basalt flows
No full textSimple numerical models suggest that many basaltic lava flows should sufficiently heat the sediments beneath them to reset (U‐Th)/He systematics in detrital zircon and apatite. This result suggests a useful way to date such flows when more conventional geochronological approaches are either impractical or yield specious results. We present here a test of this method on sediments interstratified with basalt flows of the Taos Plateau Volcanic Field of New Mexico. Nineteen zircons and apatites from two samples of baked sand collected from the uppermost 2 cm of a fluvial channel beneath a flow of the Upper Member of the Servilleta Basalt yielded an apparent age of 3.487 ± 0.047 Ma (2 SE confidence level), within the range of all published 40Ar/39Ar dates for other flows in the Upper Member (2.81–3.72 Ma) and statistically indistinguishable from the 40Ar/39Ar dates for basal flows of the Upper Member with which the studied flow is broadly correlative (3.61 ± 0.13 Ma). Given the high yield of 4He from U and Th decay, this technique may be especially useful for dating Pleistocene basalt flows. Detailed studies of the variation of (U‐Th)/He detrital mineral dates in sedimentary substrates, combined with thermal modeling, may be a valuable tool for physical volcanologists who wish to explore the temporal and spatial evolution of individual flows and lava fields.</p
Cavity optomagnonics: Manipulating magnetism by light
No full textWe discuss theoretically the coupling of magnetization and infrared photons in whispering gallery mode cavities.Casimir PhD Series, Delft-Leiden 2019-30QN/Bauer GroupQN/Theoretical Physic
Imagotutkimus The Voice radiokanavalle : Bauer Media Oy
No full textTässä opinnäytetyössä käsitellään yrityksen imagoa. Opinnäytetyössä käytiin läpi imagon muodostumista ja sen merkitystä sekä kehittymistä. Empiriaosuudessa tutkitaan radiokanava Voicen imagoa.
Teoriaosuudessa tarkastellaan yrityksen imagoa sekä imagoon liittyviä käsitteitä. Teorian keskeisimpiä osia ovat imagon rakentuminen, imagon muodostuminen sekä imagon merkitys.
Opinnäytetyön imagotutkimuksessa tutkittiin radiokanava The Voicen imagoa. Työ tehtiin Bauer Media Oy:n toimeksiantona. Tutkimuksessa selvitetään radiokanavan, sekä sen juontajien, suosiota verrattuna yrityksen kilpailijoihin. Menetelmänä käytettiin kyselytutkimusta. Kyselylomake tehtiin yhdessä Bauer Median kanssa. Kyselyssä panelisteilta kysyttiin heidän ikäänsä, suosikki radiokanavaansa sekä parasta radiojuontajaa. Kysymyksiin vastasivat Bauer Median valitsemat 26-34 –vuotiaat naiset.
Tutkimuksen perusteella voidaan sanoa, että Voicella on myönteinen imago ja se onkin kuunnelluin radiokanava kohderyhmässään. Suosituin radiojuontaja tutkimuksen kohderyhmässä oli Jaajo Linnonmaa ja The Voicen radiojuontajat eivät olleet suosittuja. Tutkimuksesta myös selvisi, että tutkimukseen osallistujat eivät seuraa juontajia sosiaalisessa mediassa.The Thesis dealt with the company´s image and the terms related to it. The empiric part of thesis examines the image of radio channel Voice and its radio personalities popularity.
The Theoretical part examines the companys´s image. The key elements of the theory are building of the image, the formation of image and the importance of image
In image research thesis author studied radio station The Voice´s image. The author got a work commissioned by Bauer Media Oy. The study examines radio station and its radio personalities popularity of the company compared to the competitors. The method was used to survey. The questionnaire was carried out with the Bauer Media. In The survey panelists were asked about their age, their favorite radio station and the best radio personality. The panelists were from 26 to 34 year-old women, who were selected by Bauer Media.
According to the results the Voice has a positive image and it is the most listened radio station in its target group. The target group´s most popular radio personality was Jaajo Linnonmaa. The Voice´s radio personalities were not popular in the survey. The research also revealed that the subjects did not follow the presenters in social media
Earthquake and tsunami impact analysis of five Oregon coastal communities
No full textReport -- Spreadsheet.by John M. Bauer, Jonathan C. Allan, Laura L. S. Gabel, Fletcher E. O'Brien, and Jed T. Roberts.Title from PDF cover (viewed on July 7, 2020).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Comparing the emission spectra of U and Th hollow cathode lamps and a new U line list
No full textContext. Thorium hollow cathode lamps (HCLs) are used as frequency calibrators for many high resolution astronomical spectrographs, some of which aim for Doppler precision at the 1 m s−1 level.
Aims. We aim to determine the most suitable combination of elements (Th or U, Ar or Ne) for wavelength calibration of astronomical spectrographs, to characterize differences between similar HCLs, and to provide a new U line list.
Methods. We record high resolution spectra of different HCLs using a Fourier transform spectrograph: (i) U–Ne, U–Ar, Th–Ne, and Th–Ar lamps in the spectral range from 500 to 1000 nm and U–Ne and U–Ar from 1000 to 1700 nm; (ii) we systematically compare the number of emission lines and the line intensity ratio for a set of 12 U–Ne HCLs; and (iii) we record a master spectrum of U–Ne to create a new U line list.
Results. Uranium lamps show more lines suitable for calibration than Th lamps from 500 to 1000 nm. The filling gas of the lamps significantly affects their performance because Ar and Ne lines contaminate different spectral regions. We find differences (up to 88%) in the line intensity of U lines in different lamps from the same batch. We find 8239 isolated lines between 500 and 1700 nm that we attribute to U, 3379 of which were not contained in earlier line lists.
Conclusions. We suggest using a combination of U–Ne and U–Ar lamps to wavelength-calibrate astronomical spectrographs up to 1 μm. From 1 to 1.7 μm, U–Ne shows better properties. The differences in line strength between different HCLs underline the importance of characterizing HCLs in the laboratory. The new 3379 U lines can significantly improve the radial velocity precision of astronomical spectrographs
Coherent pumping of high-momentum magnons by light
No full textWe propose and model a method to excite a large number of coherent magnons with high momentum in optical cavities. This is achieved by two counterpropagating optical modes that are detuned by the frequency of a selected magnon, similar to stimulated Raman scattering. In submillimeter-size yttrium iron garnet spheres, a milliwatt laser input power generates 106-108 coherent magnons. The large magnon population enhances Brillouin light scattering, a probe suitable to access their quantum properties.QN/Bauer GroupQN/Blanter Grou
ICANS-V : Proceedings of the 5 Meeting of the International Collaboration on Advanced Neutron Sources
No full textThe 5 th meeting of the International Collaboration an Advanced Neutron Sources(ICANS-V) was sponsored jointly by the two German research centres KernforschungsanlageJülich (KFA) and Kernforschungszentrum Karlsruhe (KfK), involvedin the SNQ project study . It was the first meeting organized by "newcomers" inthe Collaboration who joined after ICANS-III . The meeting was subdivided intwo parts : The first two days were devoted to plenary sessions at KFA Jülich,featuring the traditional status reports from the vaious projects and invitedreview talks . These invited talks were intended to cover in a broader sensethe application and specific design problems of spallation neutron sourcefacilities . For this reason also such topics as neutrino physics, applicationof mesons to solid state research and materials problems in high radiationfields were included . The second half of the meeting consisted of topical Workshopsand discussion sessions which were held in parallel at KFA Jülich (TargetStations) and at KfK in Karlsruhe (Accelerators and Storage Rings)
An Improved Peak Voltage Calculation Method for Compensation Components in S-S and LCC-S Compensated Wireless Power Transfer Systems
No full textThe pursuit of battery charging technology for electric vehicle (EV) has led to extensive research on the inductive-based wireless power transfer (WPT) systems. In this paper, the compensation component (including coils) stresses will be studied in two commonly adopted compensation topologies, namely S-S and LCC-S compensations. Due to the peak voltage calculation inaccuracy for certain components based on conventional fundamental frequency analysis, an improved peak voltage calculation method is introduced in closed form, which is proved to be more accurate by both simulation and experiments.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag
Surface dynamics of rough magnetic films
No full textThe chirality of magnetostatic Damon-Eshbach (DE) magnons affects the transport of energy and angular momentum at the surface of magnetic films and spheres. We calculate the surface-disorder-limited dephasing and transport lifetimes of surface modes of sufficiently thick high-quality ferromagnetic films such as yttrium iron garnet. Surface magnons are not protected by chirality, but interact strongly with smooth surface roughness. Nevertheless, for long-range disorder, the transport is much less affected by the suppressed backscattering (vertex correction). Moreover, in the presence of roughness, ferromagnetic resonance under a uniform microwave field can generate a considerable number of surface magnons.QN/Bauer GroupQN/Blanter Grou
Optical Cooling of Magnons
No full textInelastic scattering of light by spin waves generates an energy flow between the light and magnetization fields, a process that can be enhanced and controlled by concentrating the light in magneto-optical resonators. Here, we model the cooling of a sphere made of a magnetic insulator, such as yttrium iron garnet, using a monochromatic laser source. When the magnon lifetimes are much larger than the optical ones, we can treat the latter as a Markovian bath for magnons. The steady-state magnons are canonically distributed with a temperature that is controlled by the light intensity. We predict that such a cooling process can significantly reduce the temperature of the magnetic order within current technology.QN/Bauer GroupQN/Blanter Grou
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