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
Filter
  • Elsevier  (82)
  • American Institute of Physics (AIP)  (35)
  • Cambridge University Press  (10)
  • BioMed Central
  • Springer Nature
  • 1990-1994  (127)
  • 11
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of fluid helium at high pressures determined from speeds of sound (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6163-6166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equation of state and heat capacity of fluid helium have been determined at temperatures from 98.15 to 298.15 K and at pressures from 100 to 1000 MPa using a new computational method. This is based on stepwise construction of ρT isobars starting from an experimental reference pρ isotherm and using the previously reported sound speed data of helium as a function of pressure and temperature. In the region of overlap, the calculated equation-of-state data show significant discrepancies from those obtained previously with direct measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462659
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Molecular dynamics simulation of a dense model bilayer of chain molecules with fixed head groups (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5377-5386 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics (MD) simulations have been performed on a model bilayer of 48 chain molecules with fixed head groups and periodic boundary conditions in the lateral direction. The effects of packing density and temperature on the extent of spatial and temporal correlations in the ensemble have been studied by analyzing the trajectories from the MD simulations. Quantities such as order parameters, number density contours, trans–gauche statistics and structure factors are evaluated as a function of distance from the plane containing the constrained head groups. The ensemble having the smallest area of 20.625 A(ring)2/molecule can be characterized as having three dimensional order, even at high temperatures, with a few gauche defects. Decreasing the packing density of the chains results in the increase of the number of gauche defects, especially at the chain extremities along with a decrease in the extent of spatial and temporal correlations. Interestingly, shorter interchain spacings are evident in the middle of the layer which can be attributed to clusters of chains lying alongside less dense domains. At temperatures lower than 300 K, the ensemble having the largest area of 26.125 A(ring)2/molecule reveals a rather complex interplay between chains wherein the lateral arrangement of the methylene units across the layer is transient and varies as a function of distance from the plane of the head groups. At temperatures higher than 300 K, thermal motion increases chain separation which effectively suppresses cluster formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461653
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Path integral description of polymers using fractional Brownian walks (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9230-9236 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The statistical properties of fractional Brownian walks are used to construct a path integral representation of the conformations of polymers with different degrees of bond correlation. We specifically derive an expression for the distribution function of the chains' end-to-end distance, and evaluate it by several independent methods, including direct evaluation of the discrete limit of the path integral, decomposition into normal modes, and solution of a partial differential equation. The distribution function is found to be Gaussian in the spatial coordinates of the monomer positions, as in the random walk description of the chain, but the contour variables, which specify the location of the monomer along the chain backbone, now depend on an index h, the degree of correlation of the fractional Brownian walk. The special case of h=1/2 corresponds to the random walk. In constructing the normal mode picture of the chain, we conjecture the existence of a theorem regarding the zeros of the Bessel function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465539
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Modified stepwise expansion method for the measurement of compressibility isotherms of gases up to 10 kbar (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1153-1154 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The stepwise expansion method for the measurement of compressibility isotherms of gases, developed recently in this laboratory, has been modified in order to measure those gases for which only low-pressure fiducial density data are available. The modified method has been tested with CH4 as a measuring gas at 298.15 K and up to 9.9 kbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141440
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Stochastic quantization of para-Fermi fields (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 156-163 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The application of the method of stochastic quantization originally attributed to Parisi and Wu has been extended to spinor fields obeying para-Fermi statistics. The connection between Euclidean and stochastic field theories is established in the conventional manner by proving the equivalence between a Langevin equation satisfied by para-Grassmann fields and a Fokker–Planck equation, the Hamiltonian of which has been constructed using para-Grassmann variables analogous to its construction from Grassmann variables in the Fermi case. As an example, a two-point Green function is calculated for any arbitrary value of order p of para-Fermi statistics, barring the pathological case p=2 which has been mentioned briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528854
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    High repetition rate operation of a rotating dielectric spark gap (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3590-3591 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The reliable operation of a spark gap at 300 Hz pulse repetition frequency by rotating a suitably configured dielectric plate between its electrodes is reported. The triggering of the spark gap has been achieved by the use of an optical sensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144544
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Effect of longitudinal flow velocity on the emission spectrum of CO2 lasers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1340-1342 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By operating a low-pressure cw CO2 laser at very high flow velocities in order to smooth out the nonuniform spatial distribution in the inverted population, experimental evidence has been provided of the important role played by the velocity of flow in the longitudinal direction in determining the rotational emission spectrum of CO2 lasers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357799
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Study of strain and disorder of InxGa1−xP/(GaAs, graded GaP) (0.25≤x≤0.8) using spectroscopic ellipsometry and Raman spectroscopy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5040-5051 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical properties of InxGa1−xP/GaAs and InxGa1−xP/graded InGaP/GaP (0.25≤x≤0.8) epitaxial layers have been studied using spectroscopic ellipsometry and Raman spectroscopy. The (E1,E1+Δ1) critical points and the first-order phonon frequencies were determined as a function of In composition. The general behavior of the peak shifts and broadenings of both the E1 gaps and the optical phonons of InxGa1−xP/GaAs can be explained in terms of biaxial strain and strain relaxation caused by lattice-mismatch. The near-cancellation of E1 gap change due to the compensation effect between alloy composition and misfit strain is observed. As misfit strain increases, the E1 gap broadens whereas the phonon line shape does not change. In strain relaxed samples of InxGa1−xP/(GaAs, graded GaP) (0.3≤x≤0.8), the E1 gap linewidth shows upward bowing as a function of In composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355746
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Use of methane in an electron cyclotron resonance plasma source for carbon delta-doping in GaAs molecular beam epitaxy (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1494-1496 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An electron cyclotron resonance (ECR) plasma source has been used with methane gas to perform carbon delta-doping in GaAs grown by molecular beam epitaxy (MBE). The ECR plasma source is installed on a chemical vapor deposition chamber which is vacuum connected to a conventional MBE apparatus. Good surface morphologies, high sheet carrier densities (1–7×1012 cm−2), and reasonable hole mobilities (75–110 cm2/V s) are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105182
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Low-temperature (10 K) photoluminescence of Ga1−xInxPyAs1−y quantum wells grown by metalorganic chemical vapor deposition (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 958-960 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ga1−x Inx As1−y Py /InP (x=0.72, y=0.39) lattice-matched quantum wells (QWs) are grown by low-pressure metalorganic chemical vapor deposition on (100) and 3° misoriented substrates, using different variations of growth technique. Low-temperature (10 K) photoluminescence is used to characterize the QWs. We find that substrates oriented closely to (100) (no intentional misorientation) produce QWs of consistently higher quality as judged by the width of the n=1 photoluminescence peak. The use of growth interruptions at the well interfaces severely degrades the QW quality. The narrowest peak observed is 5.8 meV wide from a 70-A(ring)-wide well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102591
    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...