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  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Computer-aided design of novel siderophores: Pyridinochelin (2000)
    Berlin : ZIB
    Dazugehörige Bände
    Details Verfügbarkeit
    Signatur: PIK Q 200-00-0552
    In: ZIB-Report
    Materialart: Monographie ausleihbar
    Seiten: p.9
    Serie: ZIB-Report 00-20
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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    BUCH
    Link zum Bibliothekskatalog
    get availability status
  • 2
    facet.materialart.
    Unbekannt
    Multi-messenger Observations of a Binary Neutron Star Merger (2017)
    Institute of Physics
    Details
    Publikationsdatum: 2017-10-16
    Print ISSN: 2041-8205
    Digitale ISSN: 2041-8213
    Thema: Physik
    Publiziert von Institute of Physics
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 3
    facet.materialart.
    Unbekannt
    Table 3: Reproductive viability of Hemichloris antarctica after cycles of cooling und warming (1988)
    PANGAEA
    In:  Supplement to: Meyer, M A; Huang, G-H; Morris, G J; Friedmann, E Imre (1988): 2.2 The effect of low temperatures on Antarctic endolithic green algae. Polarforschung, 58(2/3), 113-119, hdl:10013/epic.29606.d001
    Details
    Publikationsdatum: 2023-07-10
    Beschreibung: Laboratory experiments show that undercooling to about -5°C occurs in colonized Beacon sandstones of the Ross Desert, Antarctica. High-frequency temperature oscillations between 5°C and -5°C or -10°C (which occur in nature on the rock surface) did not damage Hemichloris antarctica. In a cryomicroscope, H. antarctica appeared to be undamaged after slow or rapid cooling to -50°C. l4CO2 incorporation after freezing to -20°C was unaffected in H. antarctica or in Trebouxia sp. but slightly depressed in Stichococcus sp. (isolated from a less extreme Antarctic habitat). These results suggest that the freezing regime in the Antarctic desert is not injurious to endolithic algae. It is likely that the freezing-point depression inside the rock makes available liquid water for metabolic activity at subzero temperatures. Freezing may occur more frequently on the rock surface and contribute to the abiotic nature of the surface.
    Schlagwort(e): Age; Cycles; Range; Standard deviation; Viability
    Materialart: Dataset
    Format: text/tab-separated-values, 112 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 4
    Digitale Medien
    Digitale Medien
    The Ultraviolet Degradation of Terpolymer Scissioning Systems (1968)
    s.l. : American Chemical Society
    Macromolecules 1 (1968), S. 86-93 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma60001a015
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    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Magnetostriction and torque response of Tb0.5Dy0.5Fe2/Fe composites (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 8653-8657 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Equivolume composites of melt-spun Tb0.5Dy0.5Fe2 in an Fe matrix have been consolidated by hot pressing over a range of temperatures. We find that both the magnetic field dependence of the magnetostriction λ(H) and the torque response Rτ of these materials in a sensor configuration depend strongly on the consolidation temperature. As the hot press temperature increases, λ(H) becomes sharper, generating higher strains at lower applied fields, higher values of the maximum slope dλ/dH, and more nearly saturated λ(H) at the maximum applied field of 19 kOe. These changes in magnetostriction are closely correlated with the observed response of the composites in a torque test. For a composite hot pressed at 755 °C we observe Rτ=6.3 G/100 ppm, a value which is twice that obtained for material consolidated at 550 °C and nearly a factor of three greater than the response of maraging steel. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.373592
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  • 6
    Digitale Medien
    Digitale Medien
    Fluorescence-photoion-coincidence spectroscopy on ICN core excited molecules : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1554-1557 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An experimental setup is presented to measure coincidence spectra between a fluorescence photon (260 nm≤λph≤600 nm) and one or two photoions after core excitation providing information about the dissociation channels leading to excited, fluorescing states. The dissociation of ICN molecules excited in the iodine 4d shell is discussed. Upon resonant excitation the intensity due to the parent ion is found to be negligibly small and the atomic fragments comprise the most important part of the fluorescence intensity. For the first time coincidences between one photon and two photoions have been measured. In general, the observed mean slopes of the double coincidence peaks are consistent with photoelectron-photoion-photoion) measurements on ICN. In the I+/CN+ channel the singly charged iodine atom is found with relatively high percentage in a different excited state than in the I+/C+ or I+/N+ channels. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145906
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    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Mössbauer study of Fe-substituted Co-Zr and Cu-Zr metallic glasses (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 269-274 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The structure of pseudobinary Co-Zr and Cu-Zr metallic glasses, where Co and Cu were substituted by Fe, was studied by means of 57Fe-Mössbauer spectroscopy. The resulting spectra can be divided into two different classes: (1) For Zr concentrations larger than 67 at. %, the structure of the glass, as derived from Mössbauer spectroscopy, is nearly independent from a substitution, leading to only small changes of the average isomer shifts and quadrupole splittings. These small variations of hyperfine parameters can be ascribed to charge transfer effects. (2) For lower Zr contents, pronounced systematic changes of hyperfine parameters occur upon Co or Cu substitution. Beyond changes of the average hyperfine values, the corresponding quadrupole-splitting distributions become dependent on the degree of substitution, i.e., there is a concentration dependent splitting into two peaks. For the amorphous binary Zr-Fe system, these two peaks have been connected to two amorphous phases with concentrations near Zr2Fe and ZrFe2. At least for the Fe-doped Cu-Zr metallic glasses it could be demonstrated that Fe does not substitute the Cu sites but rather creates preferred environments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347127
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetostrictive Sm1−xNdxFe2/Fe composites from melt-spun precursors (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1654-1657 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have fabricated magnetostrictive composites containing Sm1−xNdxFe2 in an Fe matrix by hot pressing. The magnetostrictive component was prepared by heat treating melt-spun precursors, a method we find capable of producing the MgCu2-type phase for Nd concentrations as large as x=0.5. We report physical and magnetic properties of the rapidly solidified precursor materials, as well as the magnetostriction λ of Fe-based composites formed with them. The intrinsic coercivity Hci of the melt-spun ribbons decreases from 2.0 kOe for SmFe2 to 0.5 kOe for Sm0.5Nd0.5Fe2. As x increases from 0 to 0.5, λ of the composites decreases roughly linearly with x from 430 to 80 ppm. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369300
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  • 9
    Digitale Medien
    Digitale Medien
    Computer modeling of a liquid–liquid interface (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1067-1073 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Molecular dynamics method and Lennard-Jones potential functions are employed to model liquid–liquid interfaces. The simulations are carried out in a range of temperature and pressure near the triple point. The investigated systems are symmetric and composed of two identical liquids L1 and L2. The interactions between the atoms of L1 and L2 are obtained from modified Lennard-Jones potential functions where extra parameters are introduced to reduce the miscibility between the two liquids. The interfacial tensions and the miscibilities are varied by using different parameters. The interfaces thus obtained are stable on the time scale of the simulation as shown by the density and pressure profiles. This is also confirmed by a geometrical analysis performed in order to characterize the fluctuations of the interfaces. The calculation of the diffusion coefficients shows clearly an anisotropy of the diffusion process in the interfacial region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455259
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  • 10
    Digitale Medien
    Digitale Medien
    Molecular dynamics of a plastic crystal with two types of orientational disorder: Static and dynamic properties of plastic bicyclooctane (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1313-1324 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A molecular dynamics simulation of a realistic model of bicyclo-octane [HC(CH2–CH2)3CH] in its plastic phase has been performed at three different temperatures. The interactions between the molecules of the simulated system are calculated with phenomenological exp-6 additive atom–atom potentials. The molecules are considered rigid and their equations of motion are integrated using a method of constraints. A special attention is given to the problem of the C–H bond value. The static analysis of the molecular dynamics (MD) results yields a clear description of two types of orientational order: It confirms the experimental results about the equipartition of the molecular threefold axes around the eight 〈111〉 crystallographic axes and it furthermore unambiguously shows the existence of six preferred orientations for the orientational order of the molecules around their threefold axes where a previous experimental work concluded in favor of a quasifree rotation. The mean-square displacement amplitudes of the molecular centers of mass reveal that our simulation model is not impeded by the abnormal behavior of the exp-6 potentials at small interactive distances. From a dynamical point of view, the molecular dynamics scheme clearly shows that the jumps are not instantaneous and are slightly more diverse than previously assumed. In order to achieve a precise description of these jumps, we propose to make a conceptual distinction between the mean residence times and the correlation times. By contrast with a former MD simulation, our model gives two sets of distinct characteristic times which perfectly agree with the experimentally deduced values. Given the simplifying assumptions entering the experimental models, the quality of this latter agreement also shows a certain lack of sensitivity vis a¯ vis the exact nature of the underlying microscopic mechanisms. We also examined the ability of our model to simulate the behavior of a monovacancy. We found the influence of such a defect on its immediate neighborhood to be very small even when considering the nature of the complex orientational (dis)order.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.459143
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