Search Results - (Author, Cooperation:J. Olsen)
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1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-03-06Publisher: Oxford University PressPrint ISSN: 1045-2249Electronic ISSN: 1465-7279Topics: BiologyPublished by: -
2Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-05-10Publisher: Institute of Physics Publishing (IOP)Electronic ISSN: 1748-0221Topics: PhysicsPublished by: -
3Latest Papers from Table of Contents or Articles in PressM. Raghavan ; M. DeGiorgio ; A. Albrechtsen ; I. Moltke ; P. Skoglund ; T. S. Korneliussen ; B. Gronnow ; M. Appelt ; H. C. Gullov ; T. M. Friesen ; W. Fitzhugh ; H. Malmstrom ; S. Rasmussen ; J. Olsen ; L. Melchior ; B. T. Fuller ; S. M. Fahrni ; T. Stafford, Jr. ; V. Grimes ; M. A. Renouf ; J. Cybulski ; N. Lynnerup ; M. M. Lahr ; K. Britton ; R. Knecht ; J. Arneborg ; M. Metspalu ; O. E. Cornejo ; A. S. Malaspinas ; Y. Wang ; M. Rasmussen ; V. Raghavan ; T. V. Hansen ; E. Khusnutdinova ; T. Pierre ; K. Dneprovsky ; C. Andreasen ; H. Lange ; M. G. Hayes ; J. Coltrain ; V. A. Spitsyn ; A. Gotherstrom ; L. Orlando ; T. Kivisild ; R. Villems ; M. H. Crawford ; F. C. Nielsen ; J. Dissing ; J. Heinemeier ; M. Meldgaard ; C. Bustamante ; D. H. O'Rourke ; M. Jakobsson ; M. T. Gilbert ; R. Nielsen ; E. Willerslev
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-08-30Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Alaska/ethnology ; Arctic Regions/ethnology ; Base Sequence ; Bone and Bones ; Canada/ethnology ; DNA, Mitochondrial/genetics ; Genome, Human/*genetics ; Greenland/ethnology ; Hair ; History, Ancient ; *Human Migration ; Humans ; Inuits/ethnology/*genetics/history ; Molecular Sequence Data ; Siberia/ethnology ; Survivors/history ; ToothPublished by: -
4Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-10-03Publisher: Institute of Physics Publishing (IOP)Electronic ISSN: 1748-0221Topics: PhysicsPublished by: -
5Latest Papers from Table of Contents or Articles in PressS. Funder ; H. Goosse ; H. Jepsen ; E. Kaas ; K. H. Kjaer ; N. J. Korsgaard ; N. K. Larsen ; H. Linderson ; A. Lysa ; P. Moller ; J. Olsen ; E. Willerslev
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-08-06Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
6Latest Papers from Table of Contents or Articles in PressDowless, M., Lowery, C. D., Shackleford, T., Renschler, M., Stephens, J., Flack, R., Blosser, W., Gupta, S., Stewart, J., Webster, Y., Dempsey, J., Van; Wye, A. B., Ebert, P., Iversen, P., Olsen, J. B., Gong, X., Buchanan, S., Houghton, P., Stancato, L.
The American Association for Cancer Research (AACR)
Published 2018Staff ViewPublication Date: 2018-12-04Publisher: The American Association for Cancer Research (AACR)Print ISSN: 1078-0432Electronic ISSN: 1557-3265Topics: MedicinePublished by: -
7Latest Papers from Table of Contents or Articles in PressZhang, X. L., Ha, B. B., Wang, S. J., Chen, Z. J., Ge, J. Y., Long, H., He, W., Da, W., Nian, X. M., Yi, M. J., Zhou, X. Y., Zhang, P. Q., Jin, Y. S., Bar-Yosef, O., Olsen, J. W., Gao, X.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-11-30Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: AnthropologyPublished by: -
8Articles: DFG German National LicensesRudkowski, P. ; Rudkowska, G. ; Ström-Olsen, J. O. ; Zeller, C. ; Cordery, R.
[S.l.] : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Melt-extraction technology has been developed which allows the continuous casting of fine metallic fibers down to less than 5 μm in diameter. Outstanding soft magnetic properties are found both for amorphous and crystalline alloys manufactured by this method. The technique will be discussed, as will the magnetic properties, both in ac and dc driving fields.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesGuo, X. ; Altounian, Z. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: We have succeeded in forming single-phase MnBi in its two ferromagnetic phases, the low-temperature phase (LTP) and the quenched high-temperature phase (QHTP). The formation process involves rapid solidification into the amorphous state followed by thermal annealing. The crystallization of the amorphous material involves a series of transformations before single-phase LTP ((approximately-greater-than)95 wt. %) is finally achieved at a temperature of 543 K. Further heating transforms LTP into its high-temperature structure at 635 K, which upon quenching to room temperature gives the QHTP. Some magnetic properties of LTP and QHTP are presented.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesAltounian, Z. ; Chen, X. ; Liao, L. X. ; Ryan, D. H. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Iron-rich rare-earth (R) compounds, such as R2Fe17 do not show great potential for high-performance magnet materials due primarily to their low Curie temperatures (Tc∼300–400 K). However, relatively large quantities of nitrogen or carbon atoms can be introduced into the structure, resulting in a dramatic enhancement of magnetic properties including Tc (≥700 K). The N or C atoms cause a volume expansion of a few percent of the unit cell without changing the crystal structure. The large increase in Tc can be attributed to the volume dependence of the Fe–Fe exchange interactions. A large uniaxial anisotropy field develops for R=Sm upon nitriding/carbiding with an anisotropy field that is almost double the value for Nd2Fe14B at room temperature. Problems including the precipitation of soft magnetic phases (mainly α–Fe) and the limited thermal stability of the nitrides have so far restricted the applications of these compounds. Here data are presented on combined carbide/nitride alloys prepared using a novel technique. These alloys exhibit many of the advantages of the pure compounds but with greater thermal stability and less interference from precipitated phases. A typical material, Sm2Fe17(NxC1−x)3−δ has a Tc of 758 K and an anisotropy field (μ0HA) of 15 T at room temperature.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesGuo, X. ; Chen, X. ; Altounian, Z. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: In contrast to most ferromagnetic materials, the low-temperature phase of MnBi exhibits an increased coercivity, Hc, with temperature. μ0Hc has a value of 0.2 T at room temperature, and rises dramatically to a maximum value of 1.9 T at 550 K. In the temperature region near its maximum value, Hc is much larger than that of Nd-Fe-B and has a very-low-temperature coefficient. For this reason, MnBi has a great potential as a permanent magnet material at high temperatures. To describe the temperature dependence of Hc, we develop a hybrid domain-wall pinning model which combines Hilzinger and Kronmüller's scaling theory for an anisotropic domain wall with Gaunt's theory of thermal activation. The hybrid model gives an excellent fit to the temperature dependence of Hc and provides good estimates for the domain-wall energy and thickness over the temperature range studied.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesRyan, D. H. ; Altounian, Z. ; Liao, L. X. ; Ström-Olsen, J. O. ; Muir, W. B.
[S.l.] : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Extremely low doping levels (∼1 ppm) and unambiguous interpretation combine to make the Mössbauer-source technique an ideal method for determining cobalt site preferences in intermetallic compounds. Data on Gd2Fe17 and Nd2Fe14B are presented and compared with earlier work using Mössbauer spectroscopy, NMR, and neutron diffraction.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesFowler, P. W. ; Jørgensen, P. ; Olsen, J.
College Park, Md. : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: An algorithm for the evaluation of correlated dipole–dipole dispersion coefficients by direct MCSCF linear response theory is presented. Stepwise construction of a pseudo-state basis using eigenvectors of successive (Cauchy) moments of the linear response function gives an efficient scheme for obtaining polarizabilities at imaginary frequency. The scheme is also useful for polarizabilities on the real axis below the frequency of the first dipole-allowed transition. Sample calculations of C6 coefficients are described for a range of two-electron (H−, He, Li+, Be2+, H2, and H+3 ) and many-electron (Be, N, N2 ) closed- and open-shell systems.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1475-4991Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: EconomicsNotes: This article deals with problems of construction of “square” input-output tables from detailed commodity and industry data and operationalization of the tables for use in econometric modeling. The adaptation procedure suggested is quite new and involves perfect and imperfect aggregation, and suppression of insignificant cells of the tables.Using slight modifications of well-known input-output methods (to make definitions conform to general concepts of network flow theory) it is shown that the construction and aggregation of tables, as well as the suppression of minor cells, can be viewed as still higher levels of the very same process: the search for a manageable model with roughly the same abstract properties as the original detailed, but overwhelmingly large, model.Simultaneously a consistent input-output terminology is suggested with fewer symbols and more rules than usual.The adaptation procedure has been applied successfully to the 1982 version of ADAM, the macroeconometric model operated by Danmarks Statistik (the Danish Central Bureau of Statistics).Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesMao, O. ; Yang, J. ; Altounian, Z. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: RFe7 compounds with the TbCu7 structure have been synthesized by annealing of mechanically alloyed powders. The lattice constants a and c decrease with increasing atomic number of the rare earths except for Ce which has a different valence state. Introduction of nitrogen interstitial atoms into the structure results in a ∼6.0% volume expansion. In addition, nitriding gives rise to a dramatic enhancement of the magnetic properties of the compounds. Curie temperatures are increased by ∼300 °C upon nitriding. RFe7 nitrides with R=Sm, Tb, Dy, and Ho have high coercivities. A substantial enhancement in the magnetic remanence for the RFe7 nitrides with R=Tb, Dy, and Ho is attributed to the magnetic exchange coupling between grains of nanocrystalline structure in the powders. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesMao, O. ; Ström-Olsen, J. O. ; Altounian, Z. ; Yang, J.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: A series of Sm2Fe17Cx (x=0–6, nominal) interstitial compounds were synthesized by blending Sm2Fe17 and graphite in a ball mill followed by annealing of the sample powders at 450 °C for 10 h. X-ray structural analyses show that the lattice constants and the unit cell volume, v, of the carbides increases with x almost linearly up to x=2.5 and become constant above x=3.0. The Curie temperature, Tc, linearly increases with x up to x=1.7 and saturates for x(approximately-greater-than)2.0. The saturation values of lattice expansion, Δv/v, and Tc are 6.1% and 403 °C, respectively. Sm2Fe17Cx powders synthesized with this technique are highly anisotropic. Coercivities for powders with x(approximately-greater-than)2.2 are 0.8 T at room temperature. A coercivity of 1.6 T has been achieved in such powders after nitriding. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesMao, Ming ; Nguyen, S. H. ; Gaulin, B. D. ; Tun, Z. ; Bian, X. ; Altounian, Z. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Spin polarized neutron reflectometry measurements were performed on Ni80Co20/Cu multilayers with a Cu spacer thickness of 20 A(ring), corresponding to the second oscillation peak in the magnetoresistance of the NiCo/Cu multilayer system. Measurements in a 15 Oe field indicate a nearly perfect antiferromagnetic stacking of the magnetic moments in successive Ni80Co20 layers. The existence of a small magnetic anisotropy in these magnetically soft multilayers leads to the canting of the magnetic moments at an angle of ∼70° with respect to the neutron spin polarization. This interlayer antiferromagnetic coupling can be suppressed by an applied field of ∼200 Oe. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesMao, O. ; Altounian, Z. ; Yang, J. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The thermal stability of ball-milled nanocrystalline Sm2Fe17Cx interstitial compounds has been investigated. Sm2Fe17Cx decomposes into a mixture of phases upon annealing above a certain decomposition temperature, Td1, which depends on the carbon concentration in the compound. Annealing above a certain temperature Td2((approximately-greater-than)Td1), the Sm2Fe14C phase starts to form. The amount of the Sm2Fe14C phase increases with increasing annealing temperature at the expense of the Sm2Fe17 carbide until Tr1, at which temperature Sm2Fe14C starts to recombine with other phases to form the Sm2Fe17 carbide. For the starting composition with x〈1.5, the Sm2Fe17Cx single phase can be recovered above the recovery temperature Tr2((approximately-greater-than)Tr1). © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesChen, X. ; Altounian, Z. ; Ström-Olsen, J. O.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Bulk anisotropic magnets with the composition of Sm2(Fe,M)17CxNy (M=metal) have been produced by conventional powder sintering of the carbide, followed by gas-solid reaction. The results show that this is a very promising technique for producing high-performance bulk anisotropic magnets based on intercalated rare-earth–iron compounds. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesCiureanu, P. ; Rudkowski, P. ; Rudkowska, G. ; Menard, D. ; Britel, M. ; Currie, J. F. ; Ström-Olsen, J. O. ; Yelon, A.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Soft NiFe-Permalloy fibers and ultrasoft NiCo-based amorphous fibers, having a circular cross section with 30–40 μm in diameter, have been cast by melt extraction. The fibers have been driven by a sinusoidal current with 20 mApp constant amplitude and frequencies from 0.1 to 100 MHz. Both longitudinal and transverse giant magnetoimpedance effects have been observed in these fibers. The longitudinal GMI effect at 30 MHz was 60% in ultrasoft (NiCo)70FeSiBMn fibers for a saturating field of about 7 kA/m. The same effect was found at 10 MHz frequency for Permalloy fibers for a larger saturating field (20 kA/m). The transverse GMI effect was smaller (≈35% for NiCo and ≈20% for NiFe), and showed a maximum at low frequency (3 MHz). The magnetic field responses of the fibers are quadratic. An inverse effect of 10%–30% was observed for both types of fibers in longitudinal as well as in transverse field responses at high current frequency and low field strength. All of the observed effects could prove to be very useful for a new generation of high-sensitivity magnetic field sensors. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: