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  • 1
    Electronic Resource
    Electronic Resource
    Long time self-diffusion in suspensions of highly charged colloids: A comparison between pulsed field gradient NMR and Brownian dynamics (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 975-983 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The long time self-diffusion of highly charged colloidal particles consisting of polybutylacrylate was studied employing pulsed field gradient NMR (PFGNMR) and Brownian dynamics (BD) simulations. The potential parameters for the Yukawa interaction potential used in the BD simulations were derived from the static structure factor measured by means of light scattering. The long time self-diffusion coefficients resulting from NMR and BD were compared for different ionic strengths, which cause a screening of the interaction potential due to stray ions. Increasing the ionic strength of the colloidal suspensions, we observed a phase transition from a crystalline to a liquidlike structure. Whereas at high salt concentrations both long time diffusion coefficients agree within a few percent, at intermediate ionic strengths the values measured via PFGNMR are by a factor of 2 higher than those predicted by the BD simulation. This deviation is explained by hydrodynamic interactions which are expected to enhance long time self-diffusion and which are not taken into account in our BD algorithm. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326909
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  • 2
    Electronic Resource
    Electronic Resource
    Zur politischen Ökonomie der Protektion in der Bundesrepublik Deutschland (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 40 (1987), S. 0 
    Details
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Notes: Der Beitrag untersucht die Bedeutung von Ansätzen der Neuen Politischen Ökonomie für die Erklärung der Protektion in Industrien der Bundesrepublik Deutschland. Nach einer Darstellung der theoretischen Grundüberlegungen folgt ein kurzer Überblick über empirische Untersuchungen zu Bestimmungsgründen der Protektion in der Bundesrepublik. In einer ökonometrischen Untersuchung werden dann Modelle geschätzt und getestet, die als endogene Variable das Niveau der Gesamtprotektion einer Branche und als exogene Variablen eine Reihe von Grössen, die in Modellen der Neuen Politischen Ökonomie für relevant erachtet werden, enthalten. Wichtige Ergebnisse sind: Ein mit den theoretischen Überlegungen übereinstimmendes und statistisch signifikantes Vorzeichen ergab sich für den Konzentrationsgrad (positiv), den Wertschöpfungsanteil am Output (negativ) und den Importdruck aus Entwicklungsländern (positiv). Entgegen einer früheren Untersuchung für die Bundesrepublik ist jedoch die Richtung des Einflusses der Anzahl der Firmen und der Beschäftigten statistisch nicht gesichert und umgekehrt wie in den theoretischen Modellen abgeleitet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-6435.1987.tb00789.x
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  • 3
    Electronic Resource
    Electronic Resource
    German Works Councils, Profits, and Innovation (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 49 (1996), S. 0 
    Details
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-6435.1996.tb02074.x
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  • 4
    Electronic Resource
    Electronic Resource
    Band-gap narrowing in heavily doped silicon: A comparison of optical and electrical data (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 425-429 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The band-gap narrowing in heavily doped silicon has been studied by optical techniques—namely, photoluminescence and photoluminescence excitation spectroscopy—and by electrical measurements on bipolar transistors. The optical experiments give a consistent set of data for the band-gap narrowing in n- and p-type material at low temperatures as well as at room temperature. A good agreement is found between the optical and electrical data removing the discrepancies existing so far in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340257
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  • 5
    Electronic Resource
    Electronic Resource
    Damage assessment in low-dose Si-implanted GaAs by Raman spectroscopy (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1158-1160 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Allowed and forbidden first-order as well as resonant second-order Raman scattering has been used to study implantation damage in low-dose (5×1011–1×1013 cm−2) 29Si+-implanted GaAs. Symmetry forbidden scattering by longitudinal optical (LO) phonons and allowed 2LO scattering were found to be most sensitive to lattice damage for the range of implantation doses given above. The intensity ratio of the 2LO peak to the forbidden LO phonon line measures variations in the implantation dose with an accuracy better than ±7% for an average dose of 2×1012 cm−2. The potential of spatially resolved Raman spectroscopy for the assessment of homogeneity in as-implanted GaAs wafers has been demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99191
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of Nanoscale Titanium Nitride Dispersions by Small-Angle Neutron Scattering (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Suspensions of nanoscale titanium nitride (TiN) with a high solids content can be prepared by using guanidino propionic acid (GPA) as a stabilizing agent. The steric effect of an organic shell with polar groups on the surface of TiN spheres has been suggested in the literature as being a reason for the colloidal stability. To verify this hypothesis experimentally, we have performed small-angle neutron scattering (SANS) on this system; there is no evidence of an organic shell. Even at higher concentrations, in accordance with the Percus-Yevick theory, we could not observe any significant interparticular ordering. A plausible explanation for the stabilization of TiN suspensions is the buffer action of the amino acid GPA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02773.x
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  • 7
    Electronic Resource
    Electronic Resource
    Industrial Relations and Trade Union Effects on Innovation in Germany (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Labour 8 (1994), S. 0 
    Details
    ISSN: 1467-9914
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: : This paper provides a thoretical and empirical evaluation of unions’effects on innovative activity, focussing on institutional details and country-specific factors. We represent results of an econometric investigation for Germany using data at the industry and establishment level. In contrast to US studies, no statistically significant negative influence of unions on innovative activity shows up from industry-level data. Establishment-level data, however, indicate that the presence of a works council is positive for R & D if union density is not “too high”. This is in line with the more cooperative nature of industrial relations in Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9914.1994.tb00173.x
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  • 8
    Electronic Resource
    Electronic Resource
    Firm size, firm age and job duration (1996)
    Springer
    Review of industrial organization 11 (1996), S. 201-210 
    Details
    ISSN: 1573-7160
    Keywords: Job duration ; firm size ; panel data ; Germany
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Using panel data for all manufacturing firms in the German Federal State of Lower Saxony in this paper the age distribution of jobs existing in 1992 is analyzed. Four conclusions emerge: The porportion of long-lasting jobs amounts to about 75 percent in firms that were founded prior to 1978. Old jobs are relatively more frequently found in establishments that belong to a multi-establishment enterprise. Neither the sector nor the technological intensity do matter for the proportion of old jobs. Firm size is not related to the proportion of long lasting jobs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157667
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  • 9
    Electronic Resource
    Electronic Resource
    Eine Kombinationsmöglichkeit von Papierelektrophorese und Papierchromatographie zur Trennung von Aminosäuren (1958)
    Springer
    Naturwissenschaften 45 (1958), S. 110-111 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654688
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1989)
    Springer
    Small business economics 1 (1989), S. 233-243 
    Details
    ISSN: 1573-0913
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401861
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