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  • 2000-2004  (5)
  • 1960-1964  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Temperature-compensated meteorological barometer (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1909-1910 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Meteorological measurements of surface pressure to better than 1 mbar are routinely required in surface pressures of typically 1000 mbar, and detecting small pressure changes is important for forecasting. An inexpensive pressure sensor provides the basis of a barometer suitable for such general meteorological use. Signal-conditioning circuitry has been added to allow typical surface sea-level pressure variations to be resolved to 0.1 mbar using a ±5 V 12-bit analog to digital system. The sensor excitation voltage is shown to track the sensor's temperature closely, and this is extracted to provide a temperature-compensation signal. When combined with a nonlinearity correction system and a digital display, this gives a portable barometer capable of reading to ±0.5 mbar (over the range of 930–1020 mbar) for temperatures between 0 and 25 °C. The final display reading includes the temperature compensation by using a panel meter in ratio mode. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150549
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  • 2
    Digitale Medien
    Digitale Medien
    A computer-controlled Gerdien atmospheric ion counter (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3037-3041 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Accurate measurements of atmospheric ions are desirable in order to investigate atmospheric aerosol processes. A cylindrical capacitor ion counter is described which has a flexible computerized control system, to allow selection of ion mobility by changing the bias voltage across the capacitor. Ion measurements obtained correlate well with the ionization rate measured with an adjacent Geiger counter in clean air. Measurements of air ions using the device in current and voltage decay modes show consistent results. The collecting electrode is exposed directly in the air stream to be sampled, eliminating diffusive losses in intake tubes. The system can measure ion concentrations from 20 ions cm−3 (including typical atmospheric concentrations) and can sample ions rapidly. These characteristics enable comprehensive air conductivity measurements to be made. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1305511
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  • 3
    Digitale Medien
    Digitale Medien
    Fine wire thermometer for air temperature measurement (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1539-1541 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A resistive temperature sensor constructed from 25 μm platinum wire has been optimized for atmospheric measurements of air temperature, operated with a precision resistance-to-voltage converter. The sensor is able to operate in the atmosphere without a radiation shield, and calibration to better than 0.1 K accuracy can be obtained, temporally stable for the typical life of the sensor. The time response is also sufficiently rapid (lag time 40 ms) to allow it to be used for turbulent measurements in the atmospheric surface layer. The electronics system supplies sufficient signal processing for a ±5 V output to directly correspond to ±50 °C. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1336819
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  • 4
    Digitale Medien
    Digitale Medien
    A self-calibrating programable mobility spectrometer for atmospheric ion measurements (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3467-3469 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Ion measurements in atmospheric air allow atmospheric ion-aerosol charge exchange to be investigated, which is thought to be important in cloud processes. Classical aspiration ion measurement techniques have been significantly improved by the use of electronic switching systems to permit the selection of different mobilities, with adjacent instruments using the combination of Voltage Decay and ion current techniques used for calibration. An integrated programable ion mobility spectrometer using the same collection electrodes in both modes is described here, with which high-resolution measurements (1 s sampling) of ion concentration fluctuations have been made. Mobility spectrum information has also been extracted by varying the bias voltage under full computer control. The integrated system can determine small ion concentrations to ±1%, to a minimum mobility μ∼0.1 cm2 V−1 s−1 (corresponding to a particle radius of ∼2 nm). © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1382634
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  • 5
    Digitale Medien
    Digitale Medien
    A wide-range electrometer voltmeter for atmospheric measurements in thunderstorms and disturbed meteorological conditions (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 482-483 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A wide-range voltmeter system with a semiconductor electrometer input stage is described, primarily for measurements in atmospheric electricity. It is based on the floating input amplifier principle, using optical isolation to control a high voltage power supply. The system responds to unipolar direct current input voltages of up to +10 kV, with a full-scale rise time of ∼0.1 s. The input resistance is estimated as 〉0.3 TΩ and the output voltage tracks 0–10 V for input voltage variations of 0–10 kV, with voltage errors of 1%. A low impedance guard voltage is available to minimize input losses. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1435840
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  • 6
    Digitale Medien
    Digitale Medien
    Radiation Skin Reaction and Depletion and Restoration of Body Immune Response (1963)
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 1216-1217 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The 'blue flush effect'. A sharply denned blue flush is clearly visible within 2 h and persists for 24 h (it reappears with varying intensity 9 and 16 days after irradiation) over small areas of a previously depilated rabbit's flank which has been exposed to doses of 800 r. (100 kV, half value ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/1981216a0
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