ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effects of lattice mismatch and thermal annealing on deep traps and interface states in Ga0.92In0.08As(n+)/GaAs(p) heterojunctions (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4362-4366 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of the lattice-mismatch-induced defects on deep level traps in Ga0.92In0.08As(n+)/GaAs(p) heterojunction diodes have been studied by means of various deep level transient spectroscopy techniques and the frequency-dependent capacitance-voltage (C-V-f) characteristics. Three hole traps at 0.58, 0.42, and 0.27 eV were observed. We attribute the 0.42 eV trap to Cu impurity, the 0.58 eV trap to VGa or Fe, and the 0.27 eV trap to a complex associated with the 0.42 and 0.58 eV traps. Depth profiles of these hole traps in the GaAs side were measured in different lattice-mismatched samples. The depth profile data near the interface and from deep inside the bulk show evidence of impurity gettering by the mismatched interface. We also found that the concentrations of these traps were reduced by rapid thermal annealing. A U-shaped energy distribution of the interface states was obtained from the C-V-f measurements. For an in-plane mismatch greater than 0.25%, the interface state density shows no obvious dependence on the in-plane lattice mismatch, while at smaller mismatch the interface state density increases with increasing mismatch. The interface state density was on the order of 1011 cm−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352821
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Deep level capture barrier in molecular beam epitaxial grown AlAsySb1−y measured by isothermal capacitance transient spectroscopy (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 506-508 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Improved isothermal capacitance transient spectroscopy (ICTS), which measures the entire capacitance transient as a function of time and temperature in a single temperature scan, has been implemented in a deep level trap analysis extending the characterization to include capture barrier measurement. This method eliminates inaccuracies introduced by narrow pulse widths that are difficult to reproduce accurately, providing capture barrier information more accurately and easily in addition to the usual deep level characteristics. A method of establishing ICTS experimental conditions and a method of analyzing the resulting data are described and applied to the investigation of deep levels in Te-doped AlAs0.07Sb0.93. The sample shows a single DX center trap having a deep level energy of 278 meV, a high temperature capture cross section of 1.3×10−12 cm2, and a capture barrier energy of 137 meV, clearly demonstrating the superior method of measuring a capture barrier. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119592
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Interface states in regrown GaAs p-n junctions by selective molecular beam epitaxy (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 297-299 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first evaluation of interface states present in GaAs p-n junctions regrown on a SiO2 masked substrate by selective molecular beam epitaxy. A constant-capacitance deep-level transient spectroscopy (CC-DLTS) method is extended to the regrown p-n junction case, and a technique to distinguish the DLTS signal emerging from bulk and interface states is employed. The extracted interface state density is in good agreement with predictions based on the unified disorder-induced gap state model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107917
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Control of surface states in GaSb/AlxGa1−xAsySb1−y/GaxIn1−xSb/AlxGa1−xAsySb1−y quantum well structures (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2779-2781 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaSb-based lasers show advanced capabilities over other material for the far-infrared wavelength range. However, for quantum-well (QW) laser structures of AlxGa1−xAsySb1−y/GaxIn1−xAsySb1−y/AlxGa1−xAsySb1−y grown on GaSb, each component element etches at a different rate, making it difficult to achieve quality surfaces sufficiently free of defects. Thus, in this letter, the effects on the surface quality of GaSb-based laser materials have been studied using phosphoric acid etching, boron trichloride reactive ion etching (RIE), and a postetch sulfur treatment. In addition, the quality of the surface is compared for two barriers of AlAs0.07Sb0.93 and Al0.9Ga0.1As0.07Sb0.93, based on current–voltage measurements as a function of temperature. The best surfaces were produced by RIE and by using as much Ga in the barriers as the device operation allows. A generation center in the Ga0.81In0.19As0.12Sb0.88 was found at 0.14 eV for QW diodes with low surface conduction. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125147
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Sustained release of salmon calcitonin in vivo from lactide: Glycolide copolymer depots (1993)
    Springer
    Calcified tissue international 52 (1993), S. 361-364 
    Details
    ISSN: 1432-0827
    Keywords: Calcitonin ; Sustained release ; Copolymer depot ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Studies were carried out to determine whether monolithic depot formulations, prepared using lactide:glycolide copolymers, could be used to administer salmon calcitonin (sCT) to rats in vivo. Formulations containing 2, 5, or 10% (w/w) sCT were administered subcutaneously to female Wistar strain rats. Release of sCT was determined by measurement of peptide in plasma using a specific radioimmunoassay and by measurement of residual sCT in the depots after recovery at postmortem. Plasma calcium concentrations and cumulative weight gain of the animals were used to measure pharmacological effects of the released sCT. Release of sCT from the depots was controlled by the copolymer and was sustained for periods up to 10 days. However, the release of sCT from the depots did not significantly alter plasma calcium concentrations, and effects on cumulative weight gain were small and transient. Peptide loading of the formulations was shown to modify sCT release. Maximal release of sCT from depots containing 10% peptide occurred over a 7 to 14-day period postadministration, with 5% sCT release occurred between days 11 and 14, and with 2% sCT, the period of maximal release was between days 11 and 18. Release of peptide from the depots was essentially complete by 21 days postadministration irrespective of the peptide loading. These data suggest that lactide:glycolide copolymer depots may have application for the convenient clinical administration of sCT in metabolic bone diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310200
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Long-term intracellular chromium partitioning with subsurface bacteria (1994)
    Springer
    Applied microbiology and biotechnology 42 (1994), S. 403-407 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Subsurface bacteria were used to study the kinetics of chromate uptake and the internal distribution of the chromium that is taken up by these cells using two equilibration periods (1 and 50 days). Cells that were exposed to chromate for 50 days (to simulate in-situ conditions) were able to sequester up to 200% more chromium per unit mass of cells than were cells that were exposed for only 1 day. Chromium distributions showed an increase in chromium sorption by the cell wall, by the membrane and ribosome, and by the soluble fraction after a 50-day equilibration period compared to after 1 day of equilibration. Killed cell controls suggest that active transport of chromate is the method of intracellular accumulation during the 50-day equilibration period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902749
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Long-term intracellular chromium partitioning with subsurface bacteria (1994)
    Springer
    Applied microbiology and biotechnology 42 (1994), S. 403-407 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Subsurface bacteria were used to study the kinetics of chromate uptake and the internal distribution of the chromium that is taken up by these cells using two equilibration periods (1 and 50 days). Cells that were exposed to chromate for 50 days (to simulate in-situ conditions) were able to sequester up to 200% more chromium per unit mass of cells than were cells that were exposed for only 1 day. Chromium distributions showed an increase in chromium sorption by the cell wall, by the membrane and ribosome, and by the soluble fraction after a 50-day equilibration period compared to after 1 day of equilibration. Killed cell controls suggest that active transport of chromate is the method of intracellular accumulation during the 50-day equilibration period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902749
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Determination and measurement of insecticide dust particles in atmospheres adjacent to orchards (1968)
    Springer
    Bulletin of environmental contamination and toxicology 3 (1968), S. 368-374 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01558355
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Bayesian inference given data ‘significant atα’: Tests of point hypotheses (1995)
    Springer
    Theory and decision 38 (1995), S. 51-60 
    Details
    ISSN: 1573-7187
    Keywords: Bayesian inference ; significance tests ; P-values ; evidence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract In empirical research in the social sciences expressions of statistical significance are meant to capture and summarise the evidence implied by data. To evaluate the evidential content of statements such as ‘the difference between means is significant at α=5%’, we consider the Bayesian probability of the hypotheses tested, where the conditioning event is an announcement of general formsignificant at α. By proceeding as if neither observed effects nor their exactP-values are reported, the meaning of such descriptionsof themselves is revealed. It is demonstrated, for large samples particularly, that a report merely that data aresignificant at α has no objective meaning, and under some conditions should be interpreted not as evidence against the null hypothesis, as is usually supposed, but as strong evidence in its favor. This conclusion is supported by both algebraic arguments and example calculations for the special, but important case of the normal mean. It is also found that significance at one level tends to imply significance at much lower levels, the more strongly the larger the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01083168
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1981)
    Springer
    Higher education 10 (1981), S. 605-612 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01676905
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...