Search Results - (Author, Cooperation:R. Hock)
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1Latest Papers from Table of Contents or Articles in PressA. S. Gardner ; G. Moholdt ; J. G. Cogley ; B. Wouters ; A. A. Arendt ; J. Wahr ; E. Berthier ; R. Hock ; W. T. Pfeffer ; G. Kaser ; S. R. Ligtenberg ; T. Bolch ; M. J. Sharp ; J. O. Hagen ; M. R. van den Broeke ; F. Paul
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-05-21Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Arctic Regions ; Greenland ; *Ice Cover ; *SeawaterPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Change of the sound velocity and the amplitude signal of surface acoustic waves (SAW) on LiNbO3 substrates has been measured as a function of frequency during the growth of metal films of Pb, Bi, and Au on the originally free-crystal surface. Simultaneously, we recorded the conductivity of the films. SAW propagation is strongly perturbed in the percolation region where the films become conducting and mechanically connected. Au films on LiNbO3 show a new and yet unreported behavior: sound velocity and attenuation stay nearly constant over a film thickness range of ≈10 nm and conductivity is finite but low. For comparison we measured the change of sound velocity and amplitude of a SAW on a nonpiezoelectric glass substrate during the growth of a Pb film. Sound velocity is found to vary nonlinearly for a film thickness d〈dc, dc corresponding to the onset of conductivity, and linearly for d〉dc due to mass loading with increasing film thickness. No damping of the sound wave in the percolation region was observed. A new computerized ultrasonic system is described which made it possible to measure sound velocity and amplitude quasisimultaneously at up to three different frequencies.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Table 1 Affinity chromatography of 125I-photoaffinity-labelled EGF receptor Racioactivity (%) Eluting Sugar-urea Lectin sugar Unadsorbed Sugar eluate eluate Residual WGA N-Acetylglucosamine 94.8 4.4 0.7 0.1 Lens culinaris a -Methylmannoside 95.8 3.6 0.4 0.2 Concanavalin ...Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesHock, R. ; Gomm, M. ; Waibel, B. ; Magerl, A. ; Krisch, M. ; Tucoulou, R. ; Liss, K.-D.
[s.l.] : Macmillian Magazines Ltd.
Published 2000Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The temporal structure and high brilliance of the X-ray beams produced by third-generation synchrotrons open up new possibilities in time-dependent diffraction and spectroscopy, where timescales down to the sub-nanosecond regime can now be accessed. These beam properties are such that one ...Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0014-4827Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyMedicineType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0012-1606Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0304-8853Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0304-8853Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0168-9002Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 0168-9002Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 0168-9002Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1432-2021Source: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesPhysicsNotes: Abstract The Co, Mg-cation ordering in the Mg2SiO4–Co2SiO4 solid solution series as a function of the chemical composition has been studied by X-ray powder diffraction methods. The structures of nine polycrystalline samples prepared at 1200 °C and equally cooled to room temperature within 2 minutes have been refined by the Rietveld technique. The results corroborate earlier studies showing a strong preference of Co2+ for the M1 site. Considering the agreement of the powder diffraction results with those of single crystal studies allows the conclusion that the powder method is well suited for investigating the cation distribution in compounds exhibiting significant ordering effects. According to the cation distributions derived from first rapid quench experiments, the cation order of the slowly cooled samples corresponds to an estimated equilibrium temperature of 800 °C.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1434-6036Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract Neutron backscattering on vibrating silicon crystals has been measured in transmission geometry on the backscattering spectrometer IN10 at the Institute Laue-Langevin (ILL). The crystals were excited into longitudinal mechanical resonance vibrations by LiNbO3 transducers glued to the crystal surface. The transmitted intensity of the 111 Bragg reflection was measured as a function of the deformation amplitude at vibration frequencies from 2.5 MHz to 30 MHz. By vibrating the initially perfect silicon crystal, an increase in ΔE/E of the diffracted profile was achieved, accompanied by an increase of the backreflected intensity. The width of the reflection and the resolution is a linear function of the ultrasonic strain over a wide range of excitation strengths. ΔE/E can be easily tuned in a reproducible way by varying the voltage on the piezoelectric transducer. For the highest excited ultrasonic strain an increase of the backscattered intensity of about a factor of 50 is observed. Sound wave amplitudes can be determined from the measured width in ΔE/E of the transmission curves. The obtained results are relevant for the design and operation of intensity-to-resolution tunable monochromators for high resolution instruments.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesScholander, P. F. ; Flagg, Walter ; Hock, R. J. ; Irving, Laurence
Philadelphia : Wiley-Blackwell
Published 1953Staff ViewISSN: 0095-9898Keywords: Life and Medical Sciences ; Cell & Developmental BiologySource: Wiley InterScience Backfile Collection 1832-2000Topics: BiologyMedicineAdditional Material: 12 Ill.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 0044-2313Keywords: Zirconium oxidenitride ; bixbyite structure ; N/O-ordering ; high temperature behavior ; powder diffraction ; Chemistry ; Inorganic ChemistrySource: Wiley InterScience Backfile Collection 1832-2000Topics: Chemistry and PharmacologyDescription / Table of Contents: Crystal Structure and High Temperature Behavior of Zr2ON2Zr2ON2 has been prepared by solid state reaction of ZrO2 with Zr3N4. The crystal structure (Bixbyite-type) was refined using X-ray and neutron powder diffraction methods. The results indicate a nitrogen-oxygen-ordering. As detected by high temperature XRD experiments, Zr2ON2 decomposes at temperatures above 800°C to a fluorite type zirconium oxidenitride phase, nitrogen gas, and ZrN.Notes: Durch Festkörperreaktion von ZrO2 mit Zr3N4 läßt sich Zr2ON2 darstellen. Pulverbeugungsdaten des Zr2ON2 wurden in der Bixbyitstruktur verfeinert. Die erhaltenen Ergebnisse deuten auf das Vorliegen einer Stickstoff-Sauerstoff-Ordnung hin. Zr2ON2 zerfällt bei Temperaturen oberhalb von 800°C in eine Zirconiumoxidnitrid-Phase mit Fluoritstruktur, Stickstoff und ZrN. Die Zersetzungsreaktion wurde mit Röntgenpulvermethoden in situ untersucht.Additional Material: 5 Ill.Type of Medium: Electronic ResourceURL: