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  • 1
    Keywords: Forschungsbericht ; Autonomes Fahrzeug ; Lastkraftwagen ; Werkverkehr ; Pendelverkehr
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (41 Seiten, 3,50 MB) , Illustrationen, Karten
    Language: German
    Note: Förderkennzeichen BMWi 19A16002C , Verbundnummer 01172270 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 398 (1973), S. 1-14 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Ka[Yb(NH2)4].Na[Yb(NH2)4] was obtained by ammonothermal synthesis at 190°C and 5000 atm. The properties of the compound are communicated, Na[Yb(2NH2)4] crystallises orthorhombically with a = 14.70, b = 10.02, c = 7.44 Å; Z = 8, space group D2h6, P 2/n 21/n 2/a, No. 52. The atomic positions are given. The amide ions are distorted cubic close-packed. Na+ and Yb3+ occupy strongly distorted octahedral interstices. The arrangement of the cations has a layerlike character along [100].
    Notes: Durch Ammonothermalsynthese bei 190°C und 5000 atm wurde Na[Yb(NH2)4] erhalten; seine Eigenschaften werden angegeben.Na[Yb(NH2)4] kristallisiert orthorhombisch mit a = 14,70 Å, b = 10,02 Å, c = 7,44 Å, N = 8, in Raumgruppe D2h6, P 2/n 21/n 2/a, Nr. 52. Die Punktlagen werden angegeben. NH2- ist verzerrt kubisch dicht angeordnet, Na+ und Yb3+ befinden sich in stark verzerrten Anionen-Oktaedern. Die Anordnung der Kationen bedingt die Ausbildung eines Schichtencharakters in Richtung [100].
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 395 (1973), S. 291-300 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Amides of YttriumNa3[Y(NH2)6] and Na[Y(NH2)4] were prepared by the reaction of the metals in the atomic ratios 3:1 and 1:1 respectively with ammonia under high pressure (∼5000 atm) and temperatures of 250°C. Y(NH2)3 was obtained when Na[Y(NH2)4] reacted with NH4J or YJ3 with KNH2 in liquid NH3 at room temperature. YN was prepared from Y-metal at 350°C and ammonia at 600 atm.Thermal degradation of the ternary sodium compounds directly yields YN, whereas NaNH2 remains unattacked.By single crystal x-ray investigations the structure of Na3[Y(NH2)6] was determined, it crystallizes orthorhombically:\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm a = 7,24 }{\AA}{\rm, b = 10,93 }{\AA}{\rm \,und\, c = 21,68 }{\AA}; Z = \,8,\,F2/d \,2/d \,2/d, \,Nr. \,70 \\ \end{array} $$\end{document}X-ray powder patterns show that Na3[Y(NH2)4] is isotypic with Na3[Yb(NH2)4] and that Y(NH2)3 is isotypic with Yb(NH2)3. Na3[Y(NH2)4] crystallizes Orthorhombically: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l}{\rm a = 14,80 }{\AA}{\rm, b = 10,07 }{\AA}{\rm und c = 7,47 }{\AA}; Z = \,8, \,P2/n \,2_1 /n \,2/a \,Nr. \,52 \\ \end{array} $$\end{document}
    Notes: Na3[Y(NH2)6] und Na[Y(NH2)4] wurden durch Reaktion der Metalle in den Atomverhältnissen 3:1 bzw. 1:1 mit Ammoniak unter hohen Drücken (etwa 5000 atm) bei 250°C erhalten. Y(NH2)3 ließ sich nur durch Umsetzung von Na[Y(NH2)4] mit NH4J bzw. von YJ3 mit KNH2 in fl. NH3 bei Zimmertemperatur darstellen. YN wurde aus Y-Metall bei 350°C und 600 atm NH3-Druck erhalten.Die thermische Zersetzung der Natriumamidometallate führte direkt zu YN; daneben trat unzersetztes NaNH2 auf.Röntgenuntersuchungen an Einkristallen führten zur Aufklärung der Kristallstruktur des Na3[Y(NH2)6] es kristallisiert rhombisch mit \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} {\rm a = 7,24 }{\AA}{\rm, b = 10,93 }{\AA}{\rm \,und\, c = 1,68 }{\AA}; Z = \,8,\,F2/d \,2/d \,2/d, \,Nr. \,70 \\ \end{array} $$\end{document}Na[Y(NH2)4] ist auf Grund von Röntgenpulverdaten dem Na[Yb(NH2)4] isotyp; es kristallisiert orthorhombisch mit: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l}{\rm a = 14,80 }{\AA}{\rm, b = 0,07 }{\AA}{\rm und c = 7,47 }{\AA}; Z = \,8, \,P2/n \,2_1 /n \,2/a \,Nr. \,52 \\ \end{array} $$\end{document}Röntgenpulveraufnahmen und IR-spektroskopische Messungen weisen auf Isotypie von Y(NH2)3 mit Yb(NH2)3 hin.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2017-10-14
    Description: We present inelastic neutron scattering data across the Verwey transition in magnetite, obtained for a single crystal via a detwinning method. We provide direct evidence of the influence of the charge order on the transverse-acoustic phonons, associated with discontinuous hardening and narrowing at the transition temperature, and energy splitting for different polarizations. This contrasts with the behavior of the transverse-optical X 3 mode, which does not present any critical anomaly, contrary to theoretical expectations. Our data indicate that the incommensurate fluctuations occurring above the critical temperature become locked to the lattice at the transition point, through a mechanism similar to the crystallization of a two-dimensional liquid on a solid surface. Our results also contribute to clarify the different dynamics and mutual interactions of the electronic and structural modes in the Verwey transition.
    Electronic ISSN: 1367-2630
    Topics: Physics
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  • 5
    Publication Date: 2013-01-29
    Description: Author(s): B. Náfrádi, T. Keller, H. Manaka, U. Stuhr, A. Zheludev, and B. Keimer We have used a combination of neutron resonant spin-echo and triple-axis spectroscopies to determine the energy and linewidth of the magnon resonance in IPA-Cu(Cl 0.95 Br 0.05 ) 3 , a model spin-1/2 ladder antiferromagnet where Br substitution induces bond randomness. We find that the bond defects induce ... [Phys. Rev. B 87, 020408] Published Mon Jan 28, 2013
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 6
    Publication Date: 2016-04-08
    Description: Author(s): M. Ruminy, L. Bovo, E. Pomjakushina, M. K. Haas, U. Stuhr, A. Cervellino, R. J. Cava, M. Kenzelmann, and T. Fennell Recent experimental results have emphasized two aspects of Tb 2 Ti 2 O 7 , which have not been taken into account in previous attempts to construct theories of Tb 2 Ti 2 O 7 : the role of small levels of structural disorder, which appears to control the formation of a long-range ordered state of as yet unknown … [Phys. Rev. B 93, 144407] Published Wed Apr 06, 2016
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 7
    Publication Date: 2016-02-02
    Description: Author(s): G. S. Tucker, J. S. White, J. Romhányi, D. Szaller, I. Kézsmárki, B. Roessli, U. Stuhr, A. Magrez, F. Groitl, P. Babkevich, P. Huang, I. Živković, and H. M. Rønnow We have used inelastic neutron scattering to measure the magnetic excitation spectrum along the high-symmetry directions of the first Brillouin zone of the magnetic skyrmion hosting compound Cu 2 OSeO 3 . The majority of our scattering data are consistent with the expectations of a recently proposed mod… [Phys. Rev. B 93, 054401] Published Mon Feb 01, 2016
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 8
    Publication Date: 2018-09-07
    Description: Author(s): M. Pregelj, O. Zaharko, U. Stuhr, A. Zorko, H. Berger, A. Prokofiev, and D. Arčon We investigate magnetic excitations in the frustrated zigzag spin-1/2 chain compound β − TeVO 4 by inelastic neutron scattering. In the magnetically ordered ground state, the excitation spectrum exhibits coexisting magnon dispersion, characteristic of long-range magnetic order, and a spinon-like contin... [Phys. Rev. B 98, 094405] Published Thu Sep 06, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 9
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    Copernicus Publications
    In:  EPIC3Biogeosciences, Copernicus Publications, 10(3), pp. 1471-1481, ISSN: 1726-4189
    Publication Date: 2014-10-21
    Description: Impacts of ocean acidification (OA) on marine biota have been observed in a wide range of marine systems. We used a mesocosm approach to study the response of a high Arctic coastal microzooplankton community during the post-bloom period in Kongsfjorden (Svalbard) to direct and indirect effects of high pCO2/low pH. We found almost no direct effects of OA on microzooplankton composition and diversity. Both the relative shares of ciliates and heterotrophic dinoflagellates as well as the taxonomic composition of microzooplankton remained unaffected by changes in pCO2/pH. Although the different pCO2 treatments affected food availability and phytoplankton composition, no indirect effects (e.g. on the total carrying capacity and phenology of microzooplankton) could be observed. Our data point to a high tolerance of this Arctic microzooplankton community to changes in pCO2/pH. Future studies on the impact of OA on plankton communities should include microzooplankton in order to test whether the observed low sensitivity to OA is typical for coastal communities where changes in seawater pH occur frequently.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
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    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3Biogeosciences, COPERNICUS GESELLSCHAFT MBH, 10, pp. 1143-1153, ISSN: 1726-4170
    Publication Date: 2019-07-17
    Description: The effect of ocean acidification on the fatty acid composition of a natural plankton community in the Arctic was studied in a large-scale mesocosm experiment, carried out in Kongsfjorden (Svalbard, Norway) at 79°N. Nine mesocosms of ~50 m3 each were exposed to 8 different pCO2 levels (from natural background conditions to ~1420 µatm), yielding pH values (on the total scale) from ~8.3 to 7.5. Inorganic nutrients were added on day 13. The phytoplankton development during this 30 days experiment passed three distinct phases: (1) prior to the addition of inorganic nutrients, (2) first bloom after nutrient addition, and (3) second bloom after nutrient addition. The fatty acid composition of the natural plankton community was analysed and showed, in general, high percentages of polyunsaturated fatty acids (PUFAs): 44-60% of total fatty acids. Positive correlations with pCO2 were found for most PUFAs during phases 2 and/or 3, with the exception of 20:5n3 (eicosapentaenoic acid, EPA), an important diatom marker. These correlations are probably linked to changes in taxonomic composition in response to pCO2. While diatoms (together with prasinophytes and haptophytes) increased during phase 3 mainly in the low and intermediate pCO2 treatments, dinoflagellates were favoured by high CO2 concentrations during the same time period. This is reflected in the development of group-specific fatty acid trophic markers. No indications were found for a generally detrimental effect of ocean acidification on the planktonic food quality in terms of essential fatty acids.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Format: application/pdf
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