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  • Articles: DFG German National Licenses  (589)
  • Electronic Resource  (589)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Flow on the Dielectric Constant of Liquids (1941)
    [s.l.] : Nature Publishing Group
    Nature 147 (1941), S. 712-712 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE have observed that certain liquids, for example, xylene (a mixture of ortho-, para- and meta-), ethyl ether, ethyl alcohol and benzene show very small yet distinct decreases in the values of their dielectric constants when they are flowing through condenser plates of small separations. With ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/147712a0
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  • 2
    Electronic Resource
    Electronic Resource
    An integrated PC-based characterization system for optical waveguides (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2690-2694 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper reports an automatic instrument developed for characterization of optical waveguides. A specially designed waveguide excitation unit offers a flexible platform for measurement of optical waveguide characteristics like number of propagating modes, mode field intensity distribution, the refractive index profiles, waveguide geometry, attenuation, and dispersion. Further, the availability of attachments like filters, polarizers, chopper, intensity profiler, and CCD camera make the instrument flexible enough for a variety of other experiments also. The instrument is PC controlled and assisted by user friendly menu-driven software. A large number of waveguides have been analyzed using the setup. These results are also presented in the paper. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145611
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of intracavity spatial filtering on the beam characteristics of a copper vapor laser (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 537-538 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intracavity spatial filtering in a copper vapor laser is demonstrated to achieve low divergence output beam. The output beam characteristics were monitored. The average beam divergence of 0.45 mrad (∼two times the diffraction limit) was achieved. Temporal pulse width of 3-ns full width at half maximum was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347703
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Large-bore copper vapor laser with a double thyratron pulse modulator (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 314-318 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Use of a double thyratron pulse modulator in a large-bore copper vapor laser is demonstrated. Design of the laser consisting of a discharge tube of 70-mm diameter and 1500-mm length is discussed. The laser gave 55-W output power at 4.8-kHz repetition rate using neon as the buffer gas with 9.1-kW modulator switching of electrical power. The efficiency of the laser was about 0.6%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144250
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of miscible displacements of shear thinning fluids in a Hele-Shaw cell (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 14 (2002), S. 1557-1571 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A linear stability analysis of the viscous fingering of miscible non-Newtonian flow displacements in a rectilinear Hele-Shaw cell is presented. The shear-thinning character of the non-Newtonian fluid is described using the Carreau model which involves two rheological parameters De and n. Flows where either the displacing or displaced phase has a shear-thinning behavior are examined and compared with those of Newtonian flows. It is found that the shear-thinning character of the non-Newtonian fluid has an important effect on the flow instability. In particular, a flow where the driving fluid is shear-thinning is always more unstable than its Newtonian counterpart. For this flow, the maximum growth rate and the spectrum of unstable wave numbers are larger than in the Newtonian case which suggests that more ramified structures will develop as the finger instability grows. On the other hand, when the displaced fluid is non-Newtonian, a stronger shear-thinning rheological behavior leads in general to a less unstable flow. The mechanisms responsible for the changes in the flow instability are explained in terms of the different sources contributing to the generation of the vorticity disturbance. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1462030
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  • 6
    Electronic Resource
    Electronic Resource
    On steady transverse magnetogas flow (1986)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 27 (1986), S. 1466-1470 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The geometry and solutions for steady transverse magnetogas dynamic flow with arbitrary equation of state when magnitude of the velocity is constant along each individual streamline are investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527105
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  • 7
    Electronic Resource
    Electronic Resource
    Time-of-arrival digital photon correlator (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2096-2098 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Design and fabrication of the R 6501 microprocessor-based photon correlator, equally applicable to Gaussian as well as non-Gaussian radiation, is described. It works on the principle of directly registering the arrival times of photoelectrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140036
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  • 8
    Electronic Resource
    Electronic Resource
    An unstable resonator laser with a modified output coupling scheme (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3880-3882 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Unstable resonator lasers with a scraper mirror as output coupler suffers from diffraction effects associated with uniformly illuminated aperture. The near-field intensity distribution is annular in shape with minima at the center. In this communication, a modified resonator is suggested in which the resonator is folded and the scraper mirror is replaced by a partially transmitting mirror to provide the output coupling. The modified resonator is applied to a copper vapor laser. Observed near-field distribution is uniform across the beam and the intensity of the diffraction rings in the far-field profiles is considerably reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344989
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  • 9
    Electronic Resource
    Electronic Resource
    Hollow cathode plasma assisted chemical vapor deposition of diamond (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1658-1660 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method which combines thermal and plasma dissociation of a methane/hydrogen gas mixture for low-pressure chemical vapor deposition of diamond is described. A hot, thin-walled, refractory metal cathode is used to generate a high-current, low-voltage discharge. The substrates are located on the anode and immersed in the plasma emanating from the cathode tip. No auxiliary substrate heating is employed. Polycrystalline diamond particles and films are obtained on silicon (100) and molybdenum substrates at growth rates of 1–3 μm/h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99049
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  • 10
    Electronic Resource
    Electronic Resource
    Use of black diamond-like carbon films as a contrast enhancement layer for liquid-crystal displays (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2288-2290 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report development of single-layer, highly durable, pinhole-free, abrasion-resistant, chemically inert "black coating'' suitable for use as a contrast enhancement layer for liquid- crystal display devices. The single layer is a diamond-like carbon coating that has a high extinction coefficient and appears black due to optical absorption. The optical transmittance is less than 2% over the visible spectrum, and the reflectance is about 20%. Furthermore, this coating is easy to deposit onto large-area substrates at high deposition rates. The coating is sufficiently durable, electrically insulating, and chemically compatible with liquid-crystal display materials. Its hardness exceeds that of SiC (9+ on Mohs scale), and it is resistant to abrasion and most common solvents and acids. It exhibits good adhesion to glass, silicon, metal, and oxide substrates. Films of this material have been used to provide an increased contrast enhancement ratio in liquid-crystal displays. Details on the synthesis of these films are presented. Also, data on the optical and mechanical properties of these films as well as their use as contrast enhancement layers for liquid-crystal displays are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103890
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