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  • 1
    Electronic Resource
    Electronic Resource
    The status of DESY H− sources : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 992-994 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two different types of H− sources are operating at DESY, a magnetron source and a rf-driven volume source. H− sources for HERA have to run for long uninterrupted periods with a low duty factor and a high reliability. Several necessary improvements are under construction for our rf-driven volume source. The status of both our magnetron and our volume source will be discussed and the first LINAC III experiment with the rf-driven volume source will be reported. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148620
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  • 2
    Electronic Resource
    Electronic Resource
    The status of Deutsches Elektronen-Synchrotron H− sources : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1045-1047 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two different types of H− sources are operated at Deutsches Elektronen Synchrotron, a magnetron source and an experimental rf-driven volume source. H− sources for HERA have to run for long uninterrupted periods with a low duty factor and a high reliability. Several necessary improvements are under construction for our rf-driven volume source. The status of both the magnetron and volume source will be discussed and the latest experimental data will be presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146753
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  • 3
    Electronic Resource
    Electronic Resource
    A new x-ray diffraction method for structural investigations of solid-liquid interfaces (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 4169-4176 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A synchrotron x-ray diffraction method is presented for structural investigations of interfaces between low-Z substrates and heavier liquids. The method, similar to methods used in neutron scattering, is based on illuminating the interface through the solid substrate. The backgrounds arising from bulk scattering and the signal-to-background ratio are estimated and compared with experimental results. An ultrahigh vacuum (UHV) setup is described in which the atomic arrangement and roughness of clean interfaces can be studied in situ. Our first results illustrate the possibilities for both out-of-plane and in-plane diffraction studies. The specular reflectivity of the Ga/diamond(111)-2×1 interface was measured for perpendicular momentum transfers up to 2.2 Å−1. In an in-plane study of Ga/Si(111)-7×7 the in-plane structure factor of Ga liquid within a depth of ∼50 Å was compared to the structure factor of the bulk liquid. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148380
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  • 4
    Electronic Resource
    Electronic Resource
    H− ion source activities at DESY : Proceedings of fifth international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1237-1239 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The H− source for HERA is based on the design of that at FNAL. It was modified according to the Deutsches Elektronen-Synchrotron requirements. There is only one H− source connected to the H− LINAC. It must run for long uninterrupted periods with a low duty factor and a high reliability. The measured cesium distribution showed that it is necessary to keep the cold box as a barrier. The operation of the cold box was improved with a new type of high voltage insulator and a special protection against condensation at the feedthrough for high voltage and −30 °C freon. The bending magnet of the cold box will be further improved by using a permanent magnet instead of the electromagnet. A unit was designed that includes all the essential elements which are under vacuum. It can be replaced in minutes and contains a newly designed H2 piezovalve and a remodeled magnetron. The cathode of the magnetron can be heated. It is now possible to run at a low repetition rate of 1/4 Hz and thus reduce Cs and H2 consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145019
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  • 5
    Electronic Resource
    Electronic Resource
    An electronic pepper pot : Proceedings of 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1459-1461 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An electronic pepper pot has been developed at DESY for analyzing the H− beam. It consists of a number of slits in front of a harp with a high wire density. Multiplexing of the harp signals is done in the vacuum. The number of slits and the distance between the harp and the slits can be varied according to the beam parameters. The first version consists of a harp with 484 wires which are 0.1 mm wide with a spacing of 0.1 mm. They are printed on a board. The storage and readout is done using three chips in the vacuum. External transfer of the analog signals is done with a few lines. One may measure the current distribution and the emittance within one shot of the beam and is free to choose the time for the sample. This is of special interest for sources with a low repetition rate such as the HERA H− source. The present arrangement is only a first step. Further designs are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144945
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  • 6
    Electronic Resource
    Electronic Resource
    Development of an invasive macroprolactinoma: a possible consequence of prolonged oestrogen replacement. Case report (1990)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 97 (1990), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1990.tb01733.x
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  • 7
    Electronic Resource
    Electronic Resource
    The 50 MeV H− linear accelerator for HERA:LINAC3 collaboration (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 867-873 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The components of the first 50 MeV accelerator in the chain of injectors to the 820 GeV HERA proton ring are described including the high energy transport line. An H− beam originates in the cesium loaded magnetron source, is preaccelerated by a radio frequency quadrupole to 750 keV, raised to 50 MeV energy in three rf resonators, and is analyzed in the transport line. The H− ions are converted to protons by stripping, when the beam is injected over several turns into the synchrotron DESY3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142023
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  • 8
    Electronic Resource
    Electronic Resource
    Glial Ion Transport and Volume Control (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 633 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb15622.x
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  • 9
    Electronic Resource
    Electronic Resource
    Safety and efficacy of semi-closed circle ventilation in small infants (1998)
    Oxford, UK : Blackwell Science Ltd
    Pediatric anesthesia 8 (1998), S. 0 
    Details
    ISSN: 1460-9592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this clinical trial was to investigate the safety and efficacy of semi-closed circle ventilation of the Dräger anaesthesia ventilators (Cicero, Cato), using a fresh gas flow (FGF) of 600 ml·min−1. Twenty infants, weighing less than 6000 g, without cardiorespiratory abnormalities who required general anaesthesia of at least 30 min were included. The FGF was reduced to 600 ml·min−1 after 10 min of denitrogenation with a FGF of 4 to 6 l·min−1. The composition of the FGF (600ml·min−1) was calculated as follows: oxygen necessary for consumption (60 ml·min−1) plus the remaining FGF in a 1:2 relationship for oxygen. The inspiratory nitrogen fraction was calculated to exclude accumulation. Inspiratory fractions of O2 and N2O plus inspiratory and endtidal CO2 partial pressures and noninvasive oxygen saturation were the control parameters. The gas concentrations (O2 and N2O) remained within safe limits. Hypoxic gas concentrations were not observed. Neither nitrogen nor CO2 accumulated in the circle system. In conclusion, low flow anaesthesia can be performed safely in infants under 6000 grams with the Dräger Cicero and Cato anaesthesia ventilators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9592.1998.00232.x
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  • 10
    Electronic Resource
    Electronic Resource
    Nitrogenase Structure and Function: A Biochemical-Genetic Perspective (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 49 (1995), S. 335-366 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.49.100195.002003
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