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  • 1
    Digitale Medien
    Digitale Medien
    Pulsed ECR source in afterglow operation at CERN : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1328-1330 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A pulsed 14 GHz ECR4 source, adapted to operate in the afterglow mode, was delivered by GANIL to CERN in the framework of the Heavy Ion Facility Project. After four months of operation to commission the facility, it completed its first operational run of nine weeks at the end of 1994, providing lead ions to nuclear physics and ion cooling experiments. A very stable beam, with a useful length of over 1 ms, of 80 eμA of Pb27+ was provided by the source over this period. The operational problems experienced during the commissioning and operation, and the investigations to improve performance for the next experimental physics run are presented. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146709
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  • 2
    Digitale Medien
    Digitale Medien
    Experiments on a 14.5 GHz electron cyclotron resonance source : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 643-645 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The 14.5 GHz ECR4 source supplied to CERN in the framework of the heavy ion facility collaboration provided Pb27+ operational beams to a new heavy ion linac in 1994. This source, which operates in the pulsed "afterglow" mode, has surpassed its design specification of 80 eμA and now provides currents 〉120 eμA on an operational basis for this charge state. Early tests showed the existence of extremely stable modes of operation which are fully exploited, and in 1996 the source was operational on a 24 h basis for more than 2400 h. Future operational requirements will benefit from the 10 Hz repetition rate of the source, but will require beam pulse length modulation. In the search for higher intensities a number of experiments were performed on gas composition, rf power matching, extraction, plasma chamber liner, and a biased dynode. The results of these tests will be presented. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1148535
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  • 3
    Digitale Medien
    Digitale Medien
    Multicharged ion sources for pulsed accelerators (invited) : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 945-949 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The relatively low duty cycle of pulsed accelerators can give rise to problems in matching the characteristics of multicharged ion sources to the beam intensity required by the user. Heavy ion physics interests, especially in the heavy ion colliders, demand more and more intensity while the accelerator designers require higher charge states to ease their machine problems. Various options for ion sources for present and future heavy ion accelerators are presented. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146779
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  • 4
    Digitale Medien
    Digitale Medien
    Scanning apertureless microscopy below the diffraction limit: Comparisons between theory and experiment (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 4022-4024 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The exact nature of the signal in scanning apertureless microscopy techniques is the subject of much debate. We have sought to resolve this controversy by carrying out simulations and experiments on the same structures. Simulations of a model of tip–sample coupling are shown to exhibit features that are in agreement with experimental observations at dimensions below the diffraction limit. The simulation of the optical imaging process is carried out using atomic force microscope data as a topographical template and a tip–sample dipole coupling model as the source of optical signal. The simulations show a number of key fingerprints including a dependence on the polarization of the external laser source, the size of the tip, and index of refraction of the sample being imaged. The experimental results are found to be in agreement with many of the features of the simulations. We conclude that the results of the dipole coupling theory agree qualitatively with experimental data and that apertureless microscopy measures optical properties, not just topography. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.125525
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  • 5
    Digitale Medien
    Digitale Medien
    Uterine carcinosarcoma in association with tamoxifen therapy (1997)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 104 (1997), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1997.tb11992.x
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  • 6
    Digitale Medien
    Digitale Medien
    Professional versus generic retail services: new insights (1995)
    Bradford : Emerald
    The @journal of services marketing 9 (1995), S. 22-35 
    Details
    ISSN: 0887-6045
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Wirtschaftswissenschaften
    Notizen: The recognition of services as a distinct type of product requiringdistinct marketing approaches is a relatively recent development in theliterature. While scholars have examined decision-based differencesbetween the marketing of services in general and the marketing oftangible products, few have had as their primary focus differences inclient behavior relative to professional versus other services. Thusproduced is the impetus for the study reported here. Focusses onidentifying strategically useful distinctions between consumer externalsearch and evaluation activities for professional versus generic retailservices. Examines the advisability of assuming that what occursrelative to the search and evaluation of tangible products or servicesin general will automatically be mirrored in an among-services setting.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/08876049510085991
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  • 7
    Digitale Medien
    Digitale Medien
    The inwardly rectifying potassium current of embryonic chick hepatocytes (1995)
    Springer
    The journal of membrane biology 144 (1995), S. 249-255 
    Details
    ISSN: 1432-1424
    Schlagwort(e): Whole cell ; Single channel ; Cesium ; Liver ; Resting potential
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The single channel and whole-cell properties of an inward, rectifying potassium current in cultured embryonic chick hepatocytes were studied at 20°C. In cell-attached patches, channels open upon membrane hyperpolarization and are present in about 90% of cellattached patches. With 145 mm potassium in the pipette, inward current has a slope conductance of 80 pS. The conductance is not a linear function of the external potassium concentration. Current saturates at high external potassium and has a Michaelis-Menten affinity constant of 275 mm potassium. Substitution of gluconate for chloride in the external solution has no significant effect on conductance, and the reversal potential shifts approximately 18 mV with a change in external potassium from 72.5 to 145 mm indicating potassium selectivity. Channel openings are characterized by multiple brief closures during a burst. The channel is inhibited by external cesium in a concentration-dependent manner. Block is characterized by an increased frequency of transient closures. Whole-cell dialysis with 145 mm CsCl of cells bathed in 145 mm KCl reveals time-independent inward currents that reverse at 0 mV in response to 200 msecvoltage steps. Although voltage ramps evoke currents that are 75% potassium dependent and cesium sensitive, the mean chord conductance (425 pS) indicates that less than five channels are open at any instant. We suggest that the inwardly rectifying potassium channel is partially inactivated in the dialysed hepatocyte.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00236838
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  • 8
    Digitale Medien
    Digitale Medien
    Two-dimensional MRI at 1.5 and 0.5 T versus CT myelography in the diagnosis of cervical radiculopathy (1996)
    Springer
    Neuroradiology 38 (1996), S. 142-147 
    Details
    ISSN: 1432-1920
    Schlagwort(e): Key words Magnetic resonance imaging ; Cervical radiculopathy ; Computed tomographic myelography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A prospective comparison was made of standard two-dimensional MRI sequences, at both high and midfield strength, with CT myelography in 23 patients with cervical spondylosis. MRI is adequate for assessment of cord compression, where high field strength is superior to midfield strength. MRI using 4-mm sections is inadequate for presurgical assessment of root compression. It remains to be proven whether thin-section white-CSF volume sequences or gadolinium-enhanced volume studies can replace CT myelography.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00604801
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  • 9
    Digitale Medien
    Digitale Medien
    Two-dimensional MRI at 1.5 and 0.5 T versus CT myelography in the diagnosis of cervical radiculopathy (1996)
    Springer
    Neuroradiology 38 (1996), S. 142-147 
    Details
    ISSN: 1432-1920
    Schlagwort(e): Magnetic resonance imaging ; Cervical radiculopathy ; Computed tomographic myelography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A prospective comparison was made of standard two-dimensional MRI sequences, at both high and midfield strength, with CT myelography in 23 patients with cervical spondylosis. MRI is adequate for assessment of cord compression, where high field strength is superior to midfield strength. MRI using 4-mm sections is inadequate for presurgical assessment of root compression. It remains to be proven whether thin-section white-CSF volume sequences or gadolinium-enhanced volume studies can replace CT myelography.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00604801
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  • 10
    Digitale Medien
    Digitale Medien
    Spinning analytic discs and domains of dependence (1998)
    Springer
    Manuscripta mathematica 97 (1998), S. 407-427 
    Details
    ISSN: 1432-1785
    Schlagwort(e): Mathematics Subject Classification (1991):Primary 32C16; Secondary 32D10, 32D15
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract: In this paper we introduce a new technique of spinning analytic discs, which allows us to control the direction of CR extension of CR functions from rigid CR manifolds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002290050111
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