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  • 1995-1999  (719)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Seismic hazard and building vulnerability in post-Soviet Central Asian Republics : [proceedings of the NATO Advanced Research Workshop on Earthquake Risk Management Strategies for Post-Soviet Central Asian Republics: Avoiding Repetition of 1988 A Sakhalin Disasters, Almaty, Kazakhstan, 22-25 October 1996] (1999)
    Dordrecht [u.a.] : Kluwer Acad. Publ.
    Associated volumes
    Details Availability
    Call number: 8/M 00.0036
    In: NATO ASI series
    Type of Medium: Monograph available for loan
    Pages: xviii, 255 S.
    ISBN: 0792355873
    Series Statement: NATO ASI series : Partnership sub-series 2, Environmental security 52
    Classification:
    B.3.1.
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Methoden der Sedimentologie : 38 Tabellen (1996)
    Stuttgart : Enke
    Details Availability
    Call number: AWI G1-97-0183
    Description / Table of Contents: Ein Buch über Methoden der Sedimentologie in deutscher Sprache hat lange gefehlt. Eine Reihe von Fachleuten geben eine Einführung in die verschiedensten Techniken zur Untersuchung von Sedimentgesteinen, von der Geländearbeit über die Korngrößenanalyse, die Licht- und Elektronenmikroskopie und die Kathodolumineszenz bis zur geochemischen Analyse. Jede Methode wird beschrieben und hinsichtlich ihrer Grenzen diskutiert. Anhand von Beispielen aus der Literatur werden die Anwendungsmöglichkeiten deutlich gemacht.
    Type of Medium: Monograph available for loan
    Pages: IX, 366 S. : zahlr. Ill. und graph. Darst.
    ISBN: 343226691X
    Uniform Title: Techniques in sedimentology
    Language: German
    Branch Library: AWI Library
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  • 3
    facet.materialart.
    Unknown
    The Effects of Gravity on ZBLAN Glass (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Heavy metal fluoride glass fibers show promise in applications such as surgical lasers, spectroscopy and imaging fiber bundles. ZBLAN, which is within this class has been studied for a number of years. ZBLAN's theoretical attenuation coefficient is approximately 0.002 dB/km which is much better than that of fused silica at 0.2 dB/km. However, due to impurities and crystallites the attenuation coefficients achieved to date are considerably larger than those of fused silica. Impurities can be controlled with better processing techniques. Crystallization has been found to be a function of gravity. It is found that heating to the crystallization temperature in unit gravity results in crystallization while heating in reduced gravity does not. The exact mechanism for this phenomenon is not known but is speculated to be related to stress.
    Keywords: Nonmetallic Materials
    Type: Non-Oxide Glasses; Apr 10, 2000 - Apr 11, 2000; Florianopolis; Brazil
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
    Electronic Resource
    Electronic Resource
    Ion-implantation in bulk semi-insulating 4H–SiC (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 752-758 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multiple energy N (at 500 °C) and Al (at 800 °C) ion implantations were performed into bulk semi-insulating 4H–SiC at various doses to obtain uniform implant concentrations in the range 1×1018–1×1020 cm−3 to a depth of 1.0 μm. Implant anneals were performed at 1400, 1500, and 1600 °C for 15 min. For both N and Al implants, the carrier concentration measured at room temperature for implant concentrations ≤1019 cm−3 is limited by carrier ionization energies, whereas for the 1020 cm−3 implant, the carrier concentration is also limited by factors such as the solubility limit of the implanted nitrogen and residual implant damage. Lattice quality of the as-implanted and annealed material was evaluated by Rutherford backscattering spectroscopy measurements. Residual lattice damage was observed in the implanted material even after high temperature annealing. Atomic force microscopy revealed increasing deterioration in surface morphology (due to the evaporation of Si containing species) with increasing annealing temperature. The surface damage is in the form of long furrows running in one direction across the wafer to a depth of ∼25 nm from the surface for samples annealed at 1600 °C for 15 min. We measured room temperature sheet resistivities of ∼70 and 1.2×104 Ω/sq., respectively, for 2×1019 cm−3 N (1500 °C annealing) and 1×1020 cm−3 Al (1600 °C annealing) implanted samples. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370799
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  • 5
    Electronic Resource
    Electronic Resource
    A 4 g, battery-powered, data logger accelerometer for free-flying birds (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4394-4397 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This computer-controlled instrument has a battery life in excess of 16 h and fits on a circuit board that is 11.9 mm wide and 27.8 mm long. A programmable microcontroller digitizes the output of a single-axis accelerometer and stores up to 4096 acceleration values in memory. A personal computer can connect to the instrument and retrieve the data through a parallel port. The instrument can be calibrated on a small centrifuge, and the data have a linear relation to acceleration between 1 and 22 g (expandable to 50 g) with a resolution of 0.3 g. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150084
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  • 6
    Electronic Resource
    Electronic Resource
    Automated microcoring device using custom core drills and lapidary techniques (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3242-3244 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple, automated, fine-control, inexpensive, mechanical apparatus for coring thin samples is described. The apparatus consists of a motor-driven wheel attached to the feed handle of a microdrill press through an adjustable linkage that produces a peck drilling action. Using a Pb–Sn solder-tipped Cu or stainless steel core drill as a lapidary tool, cylindrical samples of ceramics, metals, and minerals with densities in the range 2.3–12.4 g/cm3 and as small as 250 μm in diam and 1.0 mm in length have been cored. Textures on the cored surface depend on sample type, grit size, core drill speed, etc., but surface height variations of 0.05–0.4 μm have been achieved with coring times in the range 1–6 h. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147495
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  • 7
    Electronic Resource
    Electronic Resource
    A system for grabbing integrated video frames remotely (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4005-4007 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A system for grabbing integrated video frames produced by a remote camera is described. As part of the pointed platform in a balloon-borne experiment, we use a video charge-coupled-device camera to obtain wide field star images. To obtain images with a sufficient signal-to-noise ratio, integration times of up to 1 s are required. In applications where the frame grabber and camera are physically close to each other, timing the frame grabber trigger is straightforward; however, there are several advantages to locating the frame grabber not on the balloon payload. As a result commands issued simultaneously to the frame grabber on the ground and the camera on the balloon can be delayed relative to each other, resulting in failure to acquire an image. We have developed a system where, at the end of an integration, a tone is injected into the video field preceding the transmission of the integrated frame; the tone is used on the ground by a decoder circuit to control the frame grabber acquisition of the integrated frame. The system has operated successfully in the flight of a stratospheric balloon-borne telescope. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147305
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  • 8
    Electronic Resource
    Electronic Resource
    Nucleation of oriented diamond particles on cobalt substrates (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 1291-1296 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nucleation of oriented diamond particles on cobalt substrates has been achieved by a multistep, hot-filament chemical vapor deposition process, which involves seeding, annealing, nucleation, and then growth. The substrates were seeded with either diamond powders, graphite powders, or gaseous carbon species. Scanning electron microscopy showed that 〈111〉 oriented diamond particles were obtained on 〈0001〉 oriented single crystal cobalt substrates. Micro-Raman indicated that the quality of the diamond grown on the cobalt substrate was high, with a full width at half maximum of 4.3 cm−1. A very weak graphitic peak was observed on regions of the substrate not covered by the diamond particles, indicating that graphite codeposition was significantly suppressed. Scanning Auger depth profile analysis was done to characterize the diamond nucleation. Based on the experimental observations, a nucleation model is proposed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360768
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  • 9
    Electronic Resource
    Electronic Resource
    Oxygen loss during thermal donor formation in Czochralski silicon: New insights into oxygen diffusion mechanisms (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 1427-1442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As-grown Czochralski silicon samples with different oxygen concentrations have been heated at temperatures in the range 350–500 °C. Oxygen loss during anneals at low temperatures (T≤400 °C) is shown to follow second-order kinetics and measurements led to values of oxygen diffusivity that were larger than normal by a factor of ∼3, assuming the capture radius for dimer formation was 5 A(ring). Variations in the rate of [Oi] loss during more extended anneals could be explained if oxygen diffusion was initially enhanced but tended to its normal value as the anneals progressed. Much greater initial enhancements were derived from similar measurements for samples which had been hydrogenated by a heat treatment in H2 gas at 1300 °C for 30 min followed by a rapid quench to room temperature, and the enhancements were consistent with values derived from measurements of the relaxation of stress-induced dichroism. At higher temperatures (T≥450 °C) the measured rates of [Oi] loss were less than the expected rate of Oi-Oi interaction and tended to vary with increasingly high powers of [Oi]. Modeling of the clustering process demonstrated that the reductions could be explained if the oxygen dimers were present in a quasiequilibrium concentration throughout the anneals. The establishment of this equilibrium appears to require that oxygen dimers diffuse much more rapidly than isolated Oi atoms. The kinetics of oxygen loss over the whole range of temperatures can then be explained if dimer clustering leads mainly to increases in concentrations of agglomorates containing large numbers (≥8) of oxygen atoms. It is therefore possible to account for thermal donor (TD) formation based on the formation of different sizes of oxygen clusters, although the possibility that self-interstitials are involved in TD formation is not excluded. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358890
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  • 10
    Electronic Resource
    Electronic Resource
    A time-dependent calculation of the alignment and orientation of the CN fragment of the photodissociation of ICN (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 141-155 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We calculate the alignment and orientation of the CN fragment of the photodissociation of ICN using a time-dependent method and the diabatic potentials and transition moments of Morokuma and co-workers [J. Chem. Phys. 100, 4894 (1994)]. The time-dependent Schrödinger equation is solved using a Chebyshev method evaluating sums required to do the matrix-vector products sequentially. To prevent the wave packet from drifting off the edge of our grid we propagate in successive steps. The ground state wave function, from which the molecule is dissociated, is computed using a three-dimensional variational method. We calculate alignment and orientation for a Ji=0→Jf=1 transition. We use parity-adapted angular basis functions. Our calculated alignment and orientation are qualitatively close to experimental results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471860
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