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  • 1
    Digitale Medien
    Digitale Medien
    Annealing of silicon implanted by a high dose of cobalt ions investigated by in situ x-ray diffraction (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1590-1596 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A silicon wafer was implanted by a high dose of cobalt ions. Afterwards it was annealed in situ while grazing incidence x-ray diffraction measurements in a temperature range up to 690 °C were carried out. The formation of cobalt disilicide (CoSi2) precipitates starts during implantation. The annealing dependence of the precipitate growth, of strain relaxation, and of improvements of the silicide crystallinity was determined. We got an activation energy of (0.47±0.08) eV for the observed annealing process. The result is a buried cobalt disilicide layer with very rough interfaces. The film quality can be improved by a subsequent annealing at about 1000 °C.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.354832
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  • 2
    Digitale Medien
    Digitale Medien
    Reconstruction of three-dimensional range distributions by a modified tomographic technique (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 958-964 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: First, an overview of the present state of art of imaging of three-dimensional particle (or damage) distributions in the field of ion implantation is given. Usually, the direct measurement of three-dimensional distributions in the field of ion implantation is restricted to cases when the impinging ion beam diameter is small against the size of the corresponding distributions, i.e., to ion energies above typically 100 MeV and to microbeams of a few μm diameter. To gain information also for lower ion energies without the restriction in the beam diameter, a modified tomographic reconstruction technique has been developed recently by us and is described here in detail. Three-dimensional distributions are reconstructed from a number of one-dimensional depth profiles, implanted under various angles. Competing algorithms for the solution are discussed. For the mathematical technique chosen, some consistency tests are presented. Good accuracy of a sufficient number of input profiles is vital for the quality of the three-dimensional reconstruction
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346660
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  • 3
    Digitale Medien
    Digitale Medien
    Development of heavy ion sources at GSI : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 406-408 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: For the heavy ion accelerator Unilac Penning ionization gauge (PIG) ion sources are used to deliver multiply charged ions (〈10+) of nearly any element of the periodic table. Typical operational ion currents are given. In the future electron cyclotron resonance (ECR) ion sources will play a dominant role for the Unilac. The development of a new 14-GHz ECR ion source for very high charge states (〈28+ ) was carried out by Centre d'Études Nucléaires de Grenoble at Grenoble for a new Unilac injector. For the new heavy ion synchrotron Schwen Ionen synchrotron higher ion currents than those available from the PIG sources are required. The high current source CHORDIS was developed at Gesellschaft für schwerionenforschung (GSI) to deliver singly charged ions in the 10–100 mA range. In comparison to CHORDIS a Metal vapor vacuum arc ion source is being studied at GSI in cooperation with Lawrence Berkeley Lab. Typical operation conditions and ion yields are given for the different ion sources.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141254
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  • 4
    Digitale Medien
    Digitale Medien
    Study of the submillimeter absorptivity of high Tc superconductors by photothermal interference spectroscopy (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3476-3478 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report on the study of the submillimeter absorptivity of high-Tc superconductors by a new method, the photothermal interference spectroscopy. Absorption in a sample leads to a temperature change of the sample and, by heat transfer, also of a gas volume adjacent to the sample and to a change of refractive index in the gas volume that we detect by an interferometric method. We demonstrate the feasibility of the method by determination of the absorptivity of high-Tc superconducting YBa2Cu3O7−δ samples for submillimeter radiation at a frequency near 1 THz. The absorptivity shows a peak at Tc, that is most likely due to fluctuation effects, a strong drop below Tc and a finite value at low temperatures, with a peak near 15 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105658
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  • 5
    Digitale Medien
    Digitale Medien
    Accurate measurements of the chemical potential of polymeric systems by Monte Carlo simulation (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 4324-4330 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We present a new Monte Carlo method for estimating the chemical potential of model polymer systems. The method is based on the gradual insertion of a penetrable "ghost'' polymer into the system and is effective for large chain lengths and at high densities. Insertion of the ghost chain is facilitated by use of an expanded ensemble, in which weighted transitions are permitted between states characterizing the strength of the excluded volume and thermal interactions experienced by the ghost chain. We discuss the implementation and optimization of the method within the framework of the bond fluctuation model and demonstrate its precision by a calculation of the finite-size corrections to the chemical potential.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.467482
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  • 6
    Digitale Medien
    Digitale Medien
    Measuring the chemical potential of polymer solutions and melts in computer simulations (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 719-724 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We are presenting a new method to measure the chemical potential of polymer chains in computer simulations which has virtually no limitations in chain length. The method uses a thermodynamic integration over the excluded volume interaction of a ghost chain to determine its excess chemical potential. It is exemplified with a Monte Carlo simulation of the athermal bondflucutation model for various densities and the chain lengths N=20,50,80. Furthermore, the osmotic equation of state and the entropy density are determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.466937
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  • 7
    Digitale Medien
    Digitale Medien
    Bolus Application of a Novel Recombinant Plasminogen Activator in Acute Myocardial Infarction Patients: Pharmacokinetics and Effects on the Hemostatic System (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 667 (1992), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1992.tb51641.x
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  • 8
    Digitale Medien
    Digitale Medien
    Skp is a periplasmic Escherichia coli protein requiring SecA and SecY for export (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 5 (1991), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: Skp of Escherichia coli (OmpH of Salmonella typhimurium) is a protein whose precise function has been obscured by its ubiquity in a wide range of sub-cellular fractions such as those containing DNA, ribosomes, and outer membranes. Combining in vitro and in vivo techniques we show that Skp is synthesized as a larger precursor that is processed upon translocation across the plasma membrane. Translocation is dependent on the H+-gradient, ATP, SecA, and SecY. Upon cellular subfractionation (avoiding non-specific electrostatic interactions) Skp partitions with β-lactamase into the fraction of soluble, periplasmic proteins. In the context of the export factor properties of Skp previously demonstrated in vitro it is conceivable that this protein is involved in the later steps of protein translocation across the plasma membrane and/or sorting to the outer membrane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2958.1991.tb01990.x
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  • 9
    Digitale Medien
    Digitale Medien
    Skp is a periplasmic Escherichia coli protein requiring SecA and SecY for export (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 6 (1992), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb02173.x
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  • 10
    Digitale Medien
    Digitale Medien
    Determination of lattice parameters with the aid of a computer (1960)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 13 (1960), S. 828-829 
    Details
    ISSN: 0001-5520
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0365110X60002004
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