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  • 1
    Monograph available for loan
    Monograph available for loan
    IGBP Northern Eurasia Study : prospectus for an integrated global change Research Project (1996)
    Stockholm : Internat. Geosphere-Biosphere Programme
    Details Availability
    Call number: AWI P1-96-0441
    Type of Medium: Monograph available for loan
    Pages: 95 S. , Ill., graph. Darst.
    Series Statement: IGBP Global Change Report 37
    Note: Contents: Executive Summary. - Preface. - Background. - Goals of the Study. - General Biogeography of Northern Eurasia. - General Organisation of the Study. - Design of the Transect Component. - Design of the Network Component. - Design of the Water, Energy and Carbon Flux Component. - Design of the Fire Component. - Modelling, Integration and Data. - Global Change Impacts on Managed Forests. - Interactions. - Resource Requirements and Priorities. - Next Steps. - References. - Glossary. - Appendix 1: Site Characterisation: Required Data on Vegetation, Soil, Land Use and Climate for Trace Gas Flux Measurements. From TRAGEX Activity of IGAC (K. A. Smith). - Appendix 2: Protocols for Manipulative Experiments at Forest Sites (S. Linder). - Appendix 3: Site Requirements and Measurement Protocols for Patch Models of Ecosystem Dynamics, Based on Transect Design (H. K. M. Bugmann). - Appendix 4: Russian Scientific Institutions with a Potential Interest in the IGBP Northern Eurasia Study. - Appendix 5: list of Participants of the IGBP Workshop, Stockholm. - Appendix 6: Summary of Northern Eurasia Study Open Meeting, Tsukuba, Japan, 28 November -1 December 1995. - Appendix 7: IGBP Reports. - Appendix 8: Acronyms and Abbreviations.
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Global change and the earth system : A planet under pressure : EXecutive summary (2004)
    Stockholm : IGBP
    Details Availability
    Call number: PIK N 531-05-0017
    Type of Medium: Monograph available for loan
    Pages: 40 S.
    ISBN: 9163153807
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 3
    Electronic Resource
    Electronic Resource
    Depolarized dynamic light scattering studies of ortho-terphenyl dynamics above Tg (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4171-4179 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Depolarized Rayleigh spectra of ortho-terphenyl (OTP) were measured in the temperature range from Tg to Tg+190 K. Two samples prepared with and without "clusters'' were used for the measurement. Four different Fabry–Perot interferometers covering the time range from about 0.5 ps to 100 ns were employed. Two relaxation modes were observed: a slow mode with all its characteristics of the α process, and a fast mode with a constant, temperature independent relaxation time of about 3 ps. The fast mode has not been reported heretofore. The intensity of the fast mode vanishes at about the Vogel–Fulcher–Tamman temperature T0. The relaxation times of these two processes are found to be identical for both OTP with and without clusters. The temperature dependence of the relaxation time of the α process is Arrhenius at high temperatures, but shows a Williams–Landel–Ferry (WLF) behavior in the range from Tg to Tg+80 K for both samples with and without the long-range density fluctuations (i.e., cluster).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461873
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  • 4
    Electronic Resource
    Electronic Resource
    Solvent and polymer dynamics in concentrated polystyrene/toluene solutions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 695-703 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Depolarized Rayleigh scattering (DRS) and dielectric spectroscopy (DS) are employed to study the solvent and polymer dynamics in the polystyrene (PS)/toluene system and for PS concentration up to 0.6 g/ml. The DRS measurements were made in the temperature range from 255 to 373 K with different interferometers making possible the separation of the "fast'' solvent (in the ps time scale) from the "slow'' polymer dynamics (in the ns time scale). The DS measurements were made in the temperature range from 128 to 310 K and two processes could also be observed. With DRS and DS we investigate the very different mobilities in the PS/toluene solutions over a frequency range of ∼10 decades. The prominent features of the experimental data are (i) the existence of two primary (α−) relaxations in the macroscopically homogeneous solutions which have been analyzed using both techniques and (ii) that these relaxations reflect the polymer and solvent dynamics and display the usual Vogel–Fulcher–Tammann behavior, however, with a broad distribution of relaxation times, especially at low temperatures. The existence of two time scales in the solutions is discussed in terms of concentration heterogeneities composed of PS-rich and toluene-rich domains, large enough to exhibit two glass transitions. As a result of the strong temperature dependence for the fast solvent reorientation times the rate of change of solvent friction with polymer concentration becomes temperature dependent at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465742
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal diffusivity and structural relaxation in a supercooled liquid by a holographic grating technique (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 248-254 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The decay of a spatial transient temperature grating created within the molecular glass former phenolphthalein-dimethylether (PDE) relates to the hydrodynamic heat diffusion and the dynamics of local density fluctuations. The characteristics of the latter process agree well with the structural α relaxation observed by photon correlation and dielectric spectroscopy near and above the glass transition temperature Tg. When the α-relaxation time approaches the experimental timescale set-in by the thermal diffusivity the specific heat undergoes a dispersion. In either side of this dynamic regime, heat diffusion and α relaxation are independent modes. "Two fluid'' models of the vitreous state conform to the experimental observations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470895
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  • 6
    Electronic Resource
    Electronic Resource
    X-ray scattering study and molecular simulation of glass forming liquids: Propylene carbonate and salol (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4751-4762 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Wide angle x-ray scattering and classical molecular-dynamics simulations were employed to study structural and dynamic properties of two low-molecular weight glass-forming liquids, propylene carbonate, and salol. We observe pronounced changes in the liquid structure as a function of temperature in a wide temperature range bracketing the glass transition temperature. The experimental and simulation results compare the x-ray scattering from the liquid slightly and far above the experimental glass transition temperature, Tgexp. The simulations largely reproduce the characteristic behavior of the experimental x-ray intensities, which is interpreted in terms of clusterlike heterogeneities forming in the liquid as Tgexp is approached. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288907
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  • 7
    Electronic Resource
    Electronic Resource
    An X-ray Photon Correlation Experiment (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 1419-1421 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00005a001
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  • 8
    Electronic Resource
    Electronic Resource
    Spectrum of fast dynamics in glass forming liquids: Does the "knee" exist? (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 2312-2315 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A knee-shaped feature observed earlier in light scattering spectra of Ca0.4K0.3(NO3)1.4 (CKN) below Tc is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no "knee" in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scattering measurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477966
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  • 9
    Electronic Resource
    Electronic Resource
    Depolarized dynamic light scattering from three low molecular weight glass forming liquids: A test of the scattering mechanism (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 8401-8408 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Depolarized dynamic light scattering (DDLS) experiments are performed on the glass forming materials ortho terphenyl (OTP), bis-methyl-methoxy-phenyl-cyclohexane (BMMPC), and bis-methyl-phenyl-cyclohexane (BMPC). Depolarized spectra are obtained for the bulk liquids and for solutions of varying concentration in CCl4. Effective optical anisotropies of the molecules are obtained from the solution spectra. A detailed analysis of the DDLS spectra, as well as a comparison with the results of quasielastic neutron scattering (QENS) experiments, indicates that the DDLS spectra in the bulk liquids result from at least two physical mechanisms: (i) The low frequency part of the spectrum, in the frequency range of the α peak, arises mainly from the molecular reorientation mechanism. The integrated intensity of this contribution is proportional to the square of the effective molecular anisotropy. (ii) At higher frequencies (but still below the Boson peak), the predominant contribution to the DDLS spectrum arises from interaction-induced scattering. The intensity of this contribution increases with increasing temperature (decreasing density) in the way expected for the cancellation effect. The implications of these results for the comparison of DDLS and QENS experiments and for the comparison of the data to the predictions of mode coupling theories of glass forming liquids are discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474117
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  • 10
    Electronic Resource
    Electronic Resource
    A zwitterionic complex: crystal and molecular structure of trichloro(N-(4'-pyridyl)-4-ethoxypyridinium)zinc(II) (1978)
    s.l. : American Chemical Society
    Inorganic chemistry 17 (1978), S. 1338-1340 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50183a048
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