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  • 1
    Electronic Resource
    Electronic Resource
    Biionic Potential of Charged Membranes: Effects of the Diffusion Boundary Layers (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 3387-3393 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100010a058
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  • 2
    Electronic Resource
    Electronic Resource
    Helium scattering study of the growth mechanism and phase transitions of Pb overlayers on Cu(100) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1239-1241 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the first results of thermal energy He scattering by an heteroepitaxial system, namely Pb on Cu(100). The intensity of the specularly reflected He beam as a function of the coverage of Pb is sensitive to disordered adsorption, to the ordering of the overlayer, and to three-dimensional cluster growth. Quantitative information, such as the number of random vacancies in the as-deposited monolayer, can be obtained. The large differences in the cross sections for diffuse scattering between Pb adatoms on the Cu terraces and on the steps have been used to determine the heat of two-dimensional vaporization of Pb atoms from step to terrace sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338126
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of Raman-scattering and Shubnikov–de Haas measurements to determine charge density in doped semiconductors (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6567-6570 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have verified the accuracy of free-charge determinations from Raman scattering in doped semiconductors by comparing the results obtained from phonon–plasmon coupled-mode line-shape fits with the charge-density values extracted from the analysis of the Shubnikov–de Haas oscillations. The experiments were carried out on n-InP layers, and conduction band nonparabolicity was included both in the Lindhard–Mermin model used to fit the Raman spectra and in the Shubnikov–de Haas analysis. We find a very good agreement between Raman and magnetotransport results, which confirms the reliability of the charge-density determination from Raman-scattering measurements when the line-shape analysis is carried out using the Lindhard–Mermin model. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322593
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  • 4
    Electronic Resource
    Electronic Resource
    Hardware for measuring flow through microporous membranes (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 5343-5347 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article presents two solutions to the problem of determining small flows of liquids in experiments with solid microporous membranes. This measurement is carried out either by means of an integrator system or a derivator system which, combined with the respective control circuits, automatically control the performance of a flow measuring cell. These devices permit the determination of small flows (1–10 cm3/min with 0.1 cm3/min of sensitivity). They can also be applied to small pulsating flows such as those generated by a peristaltic pump. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146110
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of volume flow through a microporous membrane by a NTC thermistor miniature bead (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2726-2730 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We propose an application for the NTC (negative temperature coefficient) thermistor miniature bead as a sensor to measure the volume flowing through a microporous membrane over a 0–15 cm3/min range. Only one thermistor is used and small temperature changes that can occur during the experiment can be ignored. No compensation or linearity circuitry is used [C. Yang, M. Kümmel, and H. Soeberg, Sensors and Actuators 15, 51 (1988)]. Assembly is easy and it can be adapted to automatic control, for example, to control the flow of a peristaltic pump by connection to an A/D D/A board and computer. When the experimental data was fitted to a potential type curve (y=axb), a sensitivity between 5% and 8% and a correlation coefficient of 0.99 were obtained. The response of the sensor when the flow changes is immediate, although the time taken for the measurement to stabilize is dependent on the size of the variation (between 4 and 7 s). The fitting curve is used to determine the volume flow that is caused by a pressure gradient applied to the membrane placed between two bulks with the same fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144606
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  • 6
    Electronic Resource
    Electronic Resource
    Design and characterization of a digital control system for the flow through a microporous membrane (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4179-4184 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In many scientific and industrial applications the permeating flow through a membrane separating two fluid phases must be kept constant, either because the flow is feeding another system which requires a constant in-flow, or because membrane fouling is being studied and it is necessary to know what must be done to maintain the flow. We describe a digital proportional-integral controller which makes it possible to maintain a constant permeating flow through a Nuclepore membrane with 8 μm mean pore radius. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147566
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  • 7
    Electronic Resource
    Electronic Resource
    Scalar field inhomogeneous cosmologies (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 4962-4974 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Some exact solutions for the Einstein field equations corresponding to inhomogeneous G2 cosmologies with an exponential-potential scalar field, which generalize solutions obtained previously, are considered. Several particular cases are studied and the properties related to generalized inflation and asymptotic behavior of the models are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530931
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  • 8
    Electronic Resource
    Electronic Resource
    The Bondi metric and conformal motions (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 2692-2696 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that there exist no physically significant solutions of the Einstein vacuum field equations, except the trivial one (i.e., Minkowski), for axially and reflection symmetric space-times (Bondi metric) admitting a one-parameter group of conformal motions globally defined on S2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527713
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  • 9
    Electronic Resource
    Electronic Resource
    On the viscous fluid interpretation of some exact solutions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 2282-2285 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: An example of the equivalence between a perfect fluid and a viscous fluid is presented, showing that the Schwarzschild interior solution obtained from a perfect fluid can also be derived from a viscous fluid with heat conduction. The equivalence between a scalar field and a viscous fluid is investigated, showing that under certain circumstances, both can generate, from Einstein's equations, the same space-time geometry. Some examples are presented and, in particular, it is shown that every plane-symmetric solution deduced from a scalar field can also be derived from a viscous fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526810
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  • 10
    Electronic Resource
    Electronic Resource
    Asymptotic behavior of a class of inhomogeneous scalar field cosmologies (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 6283-6292 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The asymptotic behavior of a class of inhomogeneous scalar field cosmologies with a Liouville type of potential is studied. We define a set of new variables for which the phase space of the system of Einstein equations is bounded. This allows us to perform a complete analysis of the evolution of these cosmologies. We also discuss the extension of the cosmic no-hair theorem. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531776
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