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  • 1
    Digitale Medien
    Digitale Medien
    Optimization and analysis of solar selective surfaces with continuous and multilayer profiles (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6485-6491 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Both continuous and multilayer profiles of solar selective surfaces have been analyzed and optimized. The structure having the highest photothermal efficiency has two uniform absorbing layers with two antireflection layers of different refractive index materials. Interference effects were analyzed in terms of optical path length of the sublayers and their combination. The phase cancellation positions for the optimized multilayer profiles are well distributed in the solar radiation range but do not occur at wavelengths above about 2.5 μm. A study of the electric-field distribution in these optimized profiles has shown that the sharp transition at above about 2.5 μm from low to high reflectance is due to the absence of high filling factor sublayers which can act as an effective reflecting substrate. The selective properties of the optimized multilayer structures are not particularly sensitive to the optimized graded profile for thickness variations of ±20%. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359124
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  • 2
    Digitale Medien
    Digitale Medien
    Gas adsorption on microporous carbon thin films (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 1417-1424 
    Details
    ISSN: 1520-5827
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/la00041a029
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  • 3
    Digitale Medien
    Digitale Medien
    Modeling of the desorption behavior of microporous amorphous hydrogenated carbon films (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 142-147 
    Details
    ISSN: 1520-5827
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/la00013a021
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  • 4
    Digitale Medien
    Digitale Medien
    Design and validation of guarded hot plate instruments for measuring heat flow between evacuated plane-parallel glass surfaces (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2939-2947 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: This article discusses the design and construction of guarded hot plate instruments for measuring the heat flow through an evacuated space between plane-parallel glass surfaces. In this structure, the insulating region is surrounded by two pieces of relatively highly conducting material. High resolution measurements of heat flow using these instruments therefore requires the detection of quite small temperature differences (10−4 K) between the metering piece and the guard. The instruments are calibrated, and the linearity evaluated, by measuring radiative heat transfer through the evacuated space between uncoated soda lime glass sheets; this is because this heat flow can be calculated to high accuracy from the infrared optical properties of the glass. The level of parasitic heat flow in the instruments is estimated by measuring radiative heat flow between glass surfaces coated with very low emittance layers, such as evaporated gold. These instruments operate over a range of temperatures from 0 to about 70 °C. It is shown that the heat flow between evacuated glass surfaces can be measured with these instruments to high resolution (∼10 μW) and high accuracy (∼1%) over an area of ∼1 cm2. The departures from linearity, and the level of parasitic heat flow, are within the measurement resolution. For a temperature difference across the sample of 20 K, the measurement resolution corresponds to an uncertainty in the thermal conductance of the sample of ∼0.005 W m−2 K−1. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149038
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  • 5
    Digitale Medien
    Digitale Medien
    Adsorption of benzene on porous amorphous hydrogenated carbon films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3806-3811 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The annealing effect on porosity of amorphous hydrogenerated carbon thin films was studied using a quartz crystal microbalance. As-prepared films show a mesoporous structure and a low adsorption capacity which is proportional to film thickness. Porosity of the as-prepared film is estimated at about 0.15. Baking in vacuum changes the film to be highly microporous and significantly increases the porosity of the films to over 0.40, depending annealing history. Outgassing during the annealing process plays an important role in the formation of porosity. Heat treatment first opens micropores in the slightly mesoporous film. Further heating increases the number and size of micropores, and also produces mesopores. With prolonged heating at high temperatures, further outgassing occurs, resulting in collapsing of the films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350894
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  • 6
    Digitale Medien
    Digitale Medien
    Structure and surface composition of solar selective graded stainless steel/carbon cermet films (1991)
    Springer
    Applied physics 52 (1991), S. 145-150 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 68.60 + q ; 81.40 Ef
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The composition of a reactively sputtered graded stainless steel/carbon cermet with a copper base layer has been studied using Auger electron spectroscopy/argon ion depth profiling and X-ray photoelectron spectroscopy. The interlayer structure of newly deposited films is independent of the underlying substrate but exhibits strong substrate interactions following baking at 670K for 60 min. Similar behaviour is found in films aged in air at room temperature over a period of months. Metal oxide substrates are most reactive, causing oxidation within the film. This type of multilayer cermet is used in solar collectors as a spectrally selective film. The implications of these findings for the long term integrity and performance of the thermal solar collectors are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00323732
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  • 7
    Digitale Medien
    Digitale Medien
    A mathematical analysis of mechanical factors in the forced expiration (1967)
    Springer
    Bulletin of mathematical biology 29 (1967), S. 737-752 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract A one compartment, mechanical model of the human lung-thorax system is presented and mathematically analyzed. The equation relating the thoracic muscular stress to the expired air volume is developed and investigated. Assuming that the pressure drop along the airways is a linear function of air flow rate and that the effective lung-thorax compliance is constant, a form for the muscular stress as a function of time is developed. This is used to predict volume-time and flow-volume curves, which are compared to those measured on a normal individual. It appears that these theoretical results have the essential characteristics of the experimental curves. These results, coupled with the one-to-one correspondence between the parameters of the model and those of the prototype, suggest that this model should have great utility in the study of ventilatory mechanics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02476924
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  • 8
    Digitale Medien
    Digitale Medien
    Transport of gases through hemoglobin solution (1961)
    Springer
    Bulletin of mathematical biology 23 (1961), S. 223-232 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract A mathematical theory is developed to explain the observed enhancement of O2 transport through solutions by hemoglobin. At high partial pressures of O2, ordinary diffusion through the solvent accounts for all transport of O2, but at low partial pressures the transport may be increased manyfold by the presence of hemoglobin. This phenomenon is explained and its possible role in living organisms is discussed. The theory also indicates a new method of determining dissociation curves from diffusion experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02476736
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  • 9
    Digitale Medien
    Digitale Medien
    A digital computer model of the human circulatory system (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 550-564 
    Details
    ISSN: 1741-0444
    Schlagwort(e): Circulation ; Digital computers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Abstract A digital, many-compartment model of the human circulatory system, which simulates pulsatile blood flow and gas transport and exchange, has been developed. The model is specifically designed to study short-term whole-body acceleration gz encountered in modern aerial combat manoeuvres, and incorporates a realistic representation of the nonlinear elastic characteristics of circulatory elements and the related pressure-dependent flow resistance characteristic of these elements. The model has been shown to properly simulate human data for passive breathing in a supine subject. The computed carbon dioxide and oxygen partial pressures vary realistically around measured average partial pressures for human subjects. The computed time variation of pressures, circulatory chamber volumes and flow rates match corresponding human data. Under sinusoidal gz variations, the model predicts realistic variations of volumes, flows and pressures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02443402
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  • 10
    Digitale Medien
    Digitale Medien
    On the pressure-volume relationship in circulatory elements (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 565-570 
    Details
    ISSN: 1741-0444
    Schlagwort(e): Circulation ; Pressure-volume relationship
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Notizen: Abstract A generalisation of the equation used bySalazar (1964) to fit the pressure-volume relationship of normal human lungs between FRC and TLC is found to fit the pressure-volume relationship of a variety of circulatory elements. The equation contains only two fundamental physiologic parameters: one a compliance constant k and the other a maximum element volume Vm. Fits of this equation to published atrial, ventricular, veneous, and arterial data are presented. Combined with the Poiseulle relationship, this equation is shown to fit data of flow resistance against transmural pressure for the pulmonary vascular system of a dog.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02443403
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