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  • Articles  (6)
  • Articles: DFG German National Licenses  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Spectral averaging and low-frequency sampling modifications for the IQS 401 fast Fourier transform spectrum analyzer (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 159-160 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The IQS 401 spectrum analyzer, a commercial addition to the Apple II and III personal computers, can be modified for low-cost power spectrum measurements of random noise signals and similar waveforms. The IQS basic control program is changed to perform low-frequency sampling, spectral averaging, and spectrum scaling. External analog filtering must be provided on the lowest sampling rates; however, no change is made to the original IQS hardware. Resolution of 0.5 dB is obtainable from 10−4 Hz to 20 kHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138459
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  • 2
    Electronic Resource
    Electronic Resource
    Low-noise Hall probe preamplifier (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1440-1441 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A low-noise preamplifier circuit for use with Halltron HR-66 Hall effect probes in the frequency range dc to 100 kHz, shows a wideband noise of 6- and 2-mG rms for bandwidths of dc to 100 kHz and dc to 100 Hz, respectively. Below 100 Hz the noise is due to the 1/f noise from the Hall probe, while white preamplifier noise dominates above 100 Hz. Above 1 kHz, preamplifier noise exceeds the noise of the Hall probe alone by a factor of five. dc drift of the system is approximately 10 mG in 24 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138567
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  • 3
    Electronic Resource
    Electronic Resource
    Current noise in sodium β‘ alumina ceramic (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 351-354 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental bulk current noise spectra for Na β‘ alumina ceramics are observed over the frequency range f=3×10−3 Hz to 104 Hz and with low contact noise, amalgam electrodes. The noise is proportional to the square of the dc current and varies as f−3/2, suggesting bulk conductivity fluctuations arising from diffusion of the conducting ions. The results indicate that individual grains in the ceramic are not stochastically independent and that only a small fraction of the conducting ions present participate in the diffusion noise process. The number of such ions is thermally activated with an activation energy of 0.75 eV. Chemical and electrochemical contact noise indicates a reaction at the ceramic-amalgam interface characterized by a reaction rate of 6.3×102 sec−1, even for low-noise contacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335683
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular dynamics study of entangled hard-chain fluids (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 5616-5637 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By applying efficient computational algorithms to the simplest off-lattice polymer model–the freely-jointed tangent hard-sphere chain–we have been able to perform molecular dynamics simulations long enough to probe chain dynamics in the entangled regime. Chain lengths range from 8 to 192 segments while volume fractions range from 0.3 to 0.45. Analysis of the mean-square displacement (MSD), Rouse modes, scattering functions, and end-to-end vector correlations provides information about chain motion. Chain dynamics are compared with predictions of the Rouse model for short chains and the tube model of Doi and Edwards for long chains. The mean-square displacement for the inner segments of the longest chains are consistent with predictions of the tube model, reproducing the three scaling regimes that are postulated to occur. In addition, anomalous diffusive behavior in the atomic MSD of the inner segments is observed at long times as the inner segments cross over into the free diffusion limit. Rouse-mode autocorrelation functions decay non-exponentially and do not exhibit scaling consistent with the tube model. Definitive plateau-like behaviors are observed in the density–density correlations, normal coordinate decay, and end-to-end vector relaxation of the 192-mer fluids at the highest density. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471802
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular dynamics study of transport coefficients for hard-chain fluids (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 1057-1073 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Equilibrium molecular dynamics is used to simulate fluids containing molecules modeled as chains of tangent hard spheres. A partially vectorized, efficient algorithm based on the Rapaport method has been designed that allows for very long simulation times and permits calculation of transport coefficients for short chain fluids at liquid-like densities. The self-diffusion coefficient, shear and longitudinal viscosities, and thermal conductivity are calculated for chains of length 2, 4, 8, and 16 at volume fractions ranging from 0.1 to 0.5 using a mean-square displacement approach. Results from the velocity autocorrelation functions provide information about chain motion in the bulk phase. Transport properties for the hard-sphere fluid have also been calculated for systems of 512 particles. Results for chain fluids are compared to results for hard-spheres and to the corresponding Enskog theory. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469454
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  • 6
    Electronic Resource
    Electronic Resource
    Genome-wide in situ exon capture for selective resequencing (2007)
    [s.l.] : Nature Publishing Group
    Nature genetics 39 (2007), S. 1522-1527 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Increasingly powerful sequencing technologies are ushering in an era of personal genome sequences and raising the possibility of using such information to guide medical decisions. Genome resequencing also promises to accelerate the identification of disease-associated mutations. Roughly 98% of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng.2007.42
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