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  • 1
    Electronic Resource
    Electronic Resource
    Infrared Quantitative Analysis Data. CS-16. Determination of Acetylsalicylic Acid, Phenacetin, and Caffeine in Mixtures (1957)
    s.l. : American Chemical Society
    Analytical chemistry 29 (1957), S. 1895-1895 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60132a607
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  • 2
    Electronic Resource
    Electronic Resource
    Einfluß der Sättigung auf die magnetischen Leitwertsparameter von Induktionsmaschinen (1997)
    Springer
    Electrical engineering 80 (1997), S. 183-189 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The application of numerical field calculation demonstrates that the amplitudes of the pair of field waves produced by a certain pair of permeance and m.m.f. waves are not equal any longer due to the effects of saturation. Within the paper a new method is given to calculate these amplitudes maintaining the interaction of permeance and m.m.f. waves but taking into account saturation. As an example the calculation of slot harmonics demonstrates the usefulness of the new method.
    Notes: Übersicht Mit Hilfe von numerischer Feldberechnung wird gezeigt, daß die Amplituden eines Feldwellenpaars, das durch das Zusammenwirken einer Leitwerts- und Durchflutungswelle entsteht, unter dem Einfluß der Sättigung nicht mehr gleich sind. In diesem Artikel wird ein Verfahren vorgestellt, mit dem diese Amplituden auch unter Berücksichtigung des Einflusses der Sättigung aus dem Zusammenwirken von Leitwerts- und Durchflutungswellen berechnet werden können. Am Beispiel der Berechnung der Nutungsharmonischen wird die Tauglichkeit des Verfahrens demonstriert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01235713
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of pyruvote kinase isozymes among rat organs
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 157 (1973), S. 509-513 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-9861(73)90669-3
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  • 4
    Electronic Resource
    Electronic Resource
    Low-noise optical heterodyne spectrum analyzer (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4461-4466 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A prototype setup for a low-noise, high-resolution, multi-Gigahertz-span optical heterodyne spectrum analyzer is presented. The frequencies of the unknown optical spectrum are converted to zero intermediate frequency by heterodyning with the output from a tunable single-mode local oscillator laser in an optical mixer. The low-frequency beats are rectified, and their strength is recorded while the spectrum is scanned by tuning the local oscillator. Low-noise heterodyning requires double balance (or at least single balance) of the optical mixer. Further optimization of the noise performance can be achieved by adjusting the power levels of the light beams. Successful operation of the analyzer has been demonstrated by recording the output spectrum of a mode-locked dye laser. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145342
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  • 5
    Electronic Resource
    Electronic Resource
    High-repetition-rate electro-optic cavity dumping (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 961-967 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method for obtaining very high electro-optic switching rates is demonstrated and employed for cavity dumping of a synchronously pumped mode-locked dye laser. The intracavity light switch consists of a Pockels cell and a thin-film polarizer. A synchronous, field-effect transistor-switch based generator delivers, at 10 MHz repetition rate, 15-ns pulses with an amplitude of 300 V required for operating the Pockels cell. High electrical efficiency is obtained by connecting the Pockels cell via a resonant line. Dispersion of the high-voltage pulse shuttling on the line is minimized by using phase compensation networks at its ends. From the optical pulse circulating in the laser cavity at 80 MHz, an adjustable fraction is dumped out on every eighth round trip. Intermediate pulses are suppressed by about 1:100. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145630
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  • 6
    Electronic Resource
    Electronic Resource
    Frequency stabilization and control of a mode-locked dye laser (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4806-4812 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The mode comb of a synchronously pumped mode-locked dye laser is stabilized in frequency by locking one of its modes to a transmission maximum of a reference Fabry–Perot interferometer. The frequency error signal, obtained by a conventional modulation–demodulation technique, is fed back to permanently readjust the cavity length of the laser via an integrating servo amplifier and a piezo-positioned end mirror. Insertion of an appropriate loop filter prevents loop oscillations on the dominant mechanical resonance of the transducer–mirror combination. A special ramp automatic reset function is introduced to avoid saturation of the servo amplifier. To verify the improvement in laser stability the emission spectrum was scanned with a high-resolution optical spectrum analyzer. A laser linewidth of 3 MHz has been achieved. Extended linear sweeps of the stabilized mode comb for spectroscopic measurements were realized by simultaneously tuning the reference cavity and tilting the intracavity etalon. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146156
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  • 7
    Electronic Resource
    Electronic Resource
    Resonance-tracking servo for an acousto-optic modulator (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2482-2488 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new scheme for locking an acoustic resonance of an acousto-optic modulator to the exciting rf field applied for laser mode locking is presented. The resonance of the mode-locking quartz prism is temperature-tuned to match the synthesizer frequency. Deviation from perfect matching is sensed by observing the relative phase of the rf wave reflected at the device, and the error signal is fed back by a servo loop adjusting the heat delivered by a heating transistor to maintain the temperature required for exact resonance. The performance of the resonance-tracking loop was checked on several different resonances of the modulator (used in an argon-ion laser), because switching to another resonance is a simple and attractive way for changing the laser pulse repetition rate (or mode spacing) without replacing the mode-locker unit. Excellent loop response was found in all cases. The new tracking principle provides a widely extended tracking range, improved tracking accuracy and laser stability, and simplifies the laser adjustment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144706
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  • 8
    Electronic Resource
    Electronic Resource
    An elastically bent silicon crystal as a monochromator for thermal neutrons (1990)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 23 (1990), S. 105-110 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Some experimental results are presented for an elastically bent perfect silicon crystal in a strongly asymmetric diffraction geometry as a neutron monochromator. The use of this unconventional geometry of the monochromator appears to be suitable for a wide (several centimetres) incident polychromatic beam, when, thanks to the spatial condensation of the diffracted neutrons (Fankuchen effect), a high monochromatic beam density may be obtained. Furthermore, when using focusing in real and in momentum space by adjusting an optimum bending radius, the intensity diffracted by a sample may be comparable even with the best mosaic monochromators such as highly oriented pyrolytic graphite (PG). A comparison is demonstrated on the rocking curves of a strongly mosaic Ni–Al(020) crystal obtained with the monochromatic beam from bent Si(111), Si(400) and from PG(002), Cu(220) mosaic monochromators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889889012975
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  • 9
    Electronic Resource
    Electronic Resource
    Partielle Trisomie D1 — eine seltene Chromosomenanomalie (1968)
    Springer
    Human genetics 〈Berlin〉 6 (1968), S. 181-188 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Bei einem knapp 2 1/2 jährigen Mädchen mit der abgeschwächten Symptomatik des Pätau-Syndroms fand sich in allen untersuchten Zellen ein akrozentrisches Extrachromosom von der Größe eines G-Chromosoms. Auf Grund der Mißbildungen ist anzunehmen, daß dieses Chromosom ein deletiertes Chromosom D1 darstellt. Die Merkmalsausbildung bei der partiellen Trisomie D1 im Vergleich zum Pätau-Syndrom sowie die Ätiologie der Chromosomenaberration werden diskutiert.
    Notes: Summary A clinical description is given of a girl at 29 months of age with signs of an abortive Pätau's syndrome. Cultures of peripheral leucocytes revealed 47 chromosomes in all the cells with an extra chromosome corresponding in shape to the autosomes 21–22. The phenotypically normal mother and sister have a normal chromosome complement. The clinical findings suggest that the extra chromosome represents a deleted chromosome D1. The clinical features of the partial trisomy D1 in comparison with Pätau's syndrome and the aetiology of the chromosomal aberration are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297727
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  • 10
    Electronic Resource
    Electronic Resource
    Zum Einsatz von Vieldrahtkammern in der Mikrodosimetrie (1973)
    Springer
    Radiation and environmental biophysics 10 (1973), S. 299-308 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Description / Table of Contents: Zusammenfassung Es wird untersucht, ob und unter welchen Bedingungen sich die in der Hochenergiephysik entwickelten Vieldraht-Proportionalkammern (MWPC) in der Mikrodosimetrie einsetzen lassen. Ausgehend von den Grundformeln der MWPC und der Theorie der Gasverstärkung für das Gebiet hoherE/p- Werte wird an Hand von Beispielen theoretisch gezeigt, für welche Kammerkonfigurationen es möglich sein sollte, Verstärkungs- und Driftgebiet der MWPC voneinander zu trennen und damit Ionisationsereignisse im Diiftgebiet örtlich aufzulösen. Es wurde ein Versuchsaufbau erstellt, mit dem es möglich ist, die Kammerparameter zu variieren sowie Drift- und Verstärkungsraum zu trennen. Aus den aufgenommenen Spektren folgen Werte für die Ausdehnung von Drift- und Multiplikationsgebiet, die mit den theoretisch zu erwartenden in Einklang stehen.
    Notes: Summary Multi-wire proportional chambers (MWPC) have been developed in high energy physics. The basic theory of the MWPC and the theory of gas amplification for high values ofE/p are used to investigate the possible employment of MWPC in microdosimetry. It is shown by theoretical examples that for certain dimensions of a MWPC a zone of electron drift and a separate zone of gas amplification can exist. Thus a local resolution for ionization events occurring in the drift zone can be obtained. With the experimental set-up it was possible to vary the important parameters of a MWPC. The existence of an electron drift zone and a separated gas amplification zone could be shown. The pulse height spectra were used to estimate the dimensions of the drift zone. These estimates are in agreement with the theoretical computations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194225
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