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  • 1
    Electronic Resource
    Electronic Resource
    Oxidation study of plasma-enhanced chemical vapor deposited and rf sputtered hydrogenated amorphous silicon carbide films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1942-1947 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An oxidation study of plasma-enhanced chemical vapor deposited (PECVD) and rf sputtered hydrogenated amorphous silicon carbide (a-Si1−xCx:H) films was carried out using the infrared (IR) and electron spin resonance (ESR) techniques. a-Si1−xCx:H films with x=0.3, 0.5, and 0.8 were prepared with the PECVD method and significant oxide growth can only be obtained in a-Si0.2C0.8:H film. IR results showed that Si–CH3 bonds provide the necessary porous structure for oxide growth. The oxide quality was found to be poor when compared to oxide obtained from pure silicon. Annealing in nitrogen enhances the porosity of the PECVD films and results in faster oxide growth. For sputtered films, oxide growth can only be observed in film containing Si–CH3 bonds. We are not able to separate the contributions of the Si–H, Si–C, Si–CH3, and the Si dangling bonds to the oxide growth for the PECVD and rf sputtered films. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1330252
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Antenna-coupled polycrystalline silicon air-bridge thermal detector for mid-infrared radiation (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1607-1609 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline silicon (polysilicon) airbridges coupled to log-periodic and bow-tie planar antennas have been fabricated for mid-infrared radiation detection. The detectors in thermocouple and bolometer modes exhibit a higher electrical responsivity than previously reported metal based antenna-coupled thermal detectors. Measurements made at 10.2 μm wavelength indicate that the linearly polarized antennas have an on-axis cross-polarization ratio of about −4.5 dB and the pattern in the free-space side has a directivity of approximately 5–9 dB. The coupling efficiency is about 15%. Frequency responses for modulated optical signals agree with thermal transport models. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119992
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical and pyroelectric properties of in-plane polarized lead lanthanum titanate thin film (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 668-670 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pb0.9La0.1Ti0.975O3 (PLT10) thin films were deposited on SiO2/Si(100) substrates coated with a ZrO2 buffer layer. Studies by x-ray diffraction and scanning electron microscopy reveal that the ZrO2 film consists of both tetragonal and monoclinic phases, with the tetragonal phase being the dominant one. The PLT10 film has a perovskite structure and the grains in the film have a rather uniform size of about 50 nm. By using interdigital transducer (IDT) electrodes the in-plane electrical properties, hysteresis loop, and pyroelectric coefficient of the PLT10 film were measured. The dielectric constant and loss factor vary only slightly with frequency in the range 103–106 Hz, with the loss factor being less than 0.01 over the entire range. The leakage current density is lower than 2×10−8 A/cm2 at a bias field of 5 kV/cm. The remnant polarization and coercive field are 12.6 μC/cm2 and 9.93 kV/cm, respectively. The film exhibits a reasonably high pyroelectric coefficient (95 μC/m2 K) after it has been poled by applying 120 V ac at 0.1 Hz across the IDT electrodes. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1387265
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Indirect Cutting Force Measurement Considering Frictional Behaviour in a Machining Centre Using Feed Motor Current (1999)
    Springer
    The international journal of advanced manufacturing technology 15 (1999), S. 478-484 
    Details
    ISSN: 1433-3015
    Keywords: Key words.Feed force; Feed motor current; Frictional force; Up/down milling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In machine tools, friction exists between the table and the guideways, and in ballscrews. In this paper, feed motor current is measured by a hall effect current sensor. It is used to calculate the motor torque which, in turn, is the frictional torque at steady state. Some frictional phenomena are studied in feed drive systems of a horizontal machining centre, such as the relationship between feedrate and frictional torque, the relationship between frictional torque and table feed position, and the slideway cover effects on frictional torque. Considering all these frictional phenomena, the relationship between the feed force and the feed motor current is obtained. Feed force can be estimated well from the feed motor current considering frictional behaviour. The relationship between the cutting force and the feed motor current is slightly different during up milling and down milling, because y(vertical) directional cutting force changes the frictional force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050092
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of priority substituted phenols by micellar electrokinetic chromatography (1991)
    Springer
    Environmental monitoring and assessment 19 (1991), S. 93-103 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The use of micellar electrokinetic capillary chromatography (MECC) for the separation of eleven substituted phenols listed by the United States Environmental Protection Agency as priority pollutants was demonstrated. The effects of the pH and ionic strength of the buffer, and the length of the separation column on resolution were investigated. The retention characteristics of the eleven phenols in MECC are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401301
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    Paper (German National Licenses)
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