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  • 1
    Electronic Resource
    Electronic Resource
    Gas adsorption on microporous carbon thin films (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 1417-1424 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00041a029
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00013a021
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: 68.60 + q ; 81.40 Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323732
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359124
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  • 5
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350894
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  • 6
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149038
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  • 7
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476924
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  • 8
    Electronic Resource
    Electronic Resource
    Transport of gases through hemoglobin solution (1961)
    Springer
    Bulletin of mathematical biology 23 (1961), S. 223-232 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476736
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  • 9
    Electronic Resource
    Electronic Resource
    Formation of porosity in sputtered amorphous hydrogenated carbon films (1994)
    Springer
    Journal of materials science 29 (1994), S. 5794-5800 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Results are reported of the porosity and the microstructure of amorphous hydrogenated carbon films produced by direct current (d.c.) sputtering. The as-deposited films were initially slightly mesoporous. Heating the material in a vacuum, however, produced a highly porous material. The amount of porosity and the pore size distribution were directly related to the quantity of material which was outgassed during heating. The dependence on the baking temperature of the degree of sp2 hybridization in the films had the same form as the dependence of the porosity and of the quantity of outgassing. The plasmon-energy data for the films was related to the process of morphology and composition reconstruction during the heating. The outgassing quantity was strongly dependent on the oxygen content of the as-prepared material. The morphology changes in the material can be regarded as a carbon-activation process involving the incorporation of oxygen in the film during deposition, followed by the outgassing of carbon-oxygen compounds during heating in vacuum. Many of the properties of the hydrogenated amorphous carbon (a-C∶H) film were very similar to those exhibited by conventional activated carbons, and it is therefore concluded that the porous baked a-C∶H film is a form of activated carbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366859
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  • 10
    Electronic Resource
    Electronic Resource
    The probability of hertzian fracture (1994)
    Springer
    Journal of materials science 29 (1994), S. 2216-2230 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The indentation strength of brittle solids is traditionally characterized by Auerbach's law, which predicts a linear relationship between the load required to initiate a Hertzian cone crack and the radius of a spherical indentor. This paper reviews both the energy balance and flaw statistical explanations of Auerbach's law. It is shown that Auerbach's law in the strictest sense only applies to well-abraded specimens. A novel application of Weibull statistics is presented which allows the distribution of fracture loads to be predicted for any specimen surface condition for a given indentor size. The indentation strength of a brittle solid, for both spherical and cylindrical indentors, is shown to be influenced by both its surface flaw statistics and the degree of interfacial friction. It is observed that the indentation strength of soda-lime glass is increased by a factor of about three times that expected for frictionless contact, and that for a fully bonded indentor, conical fractures cannot occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154702
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