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  • 1
    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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  • 2
    Digitale Medien
    Digitale Medien
    A new model for the diffusion of arsenic in polycrystalline silicon (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 167-174 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental data are presented for the diffusion of arsenic in polycrystalline silicon (polysilicon) during a 15-min anneal at 900 °C. A new model is used to describe the data, which takes account of the different dopant diffusion rates in grains and in grain boundaries. The model is divided into early and late stages and, in particular, the early stage model identifies grain growth as the major mechanism by which arsenic transfers from the grains to the grain boundaries. In the late stage model, grain growth can be ignored and analytic solutions for the arsenic concentration are derived.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341450
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  • 3
    Digitale Medien
    Digitale Medien
    Recombination Between Repeated Genes in Microorganisms (1988)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 22 (1988), S. 147-168 
    Details
    ISSN: 0066-4197
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ge.22.120188.001051
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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Digitale Medien
    Digitale Medien
    DIVISIONALIZATION, DECENTRALIZATION AND PERFORMANCE OF LARGE UNITED KINGDOM COMPANIES (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of management studies 23 (1986), S. 0 
    Details
    ISSN: 1467-6486
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: Questionnaire survey data from 144 large U.K. firms are used to describe and discuss the nature of organization design in major companies. It was found that the majority of firms were multidivisional. However a considerable variation in internal operating procedures was found which emphasized that many multidivisional companies do not behave in the way that the strategy/structure literature predicts. Empirical testing of the relation between structure and financial performance also emphasizes that divisionalization is not necessarily the key to a superior profit performance. Rather it would appear that organizational procedures need to be reconsidered in the light of recent divisional structures established in many companies. It is argued that a powerful divisional head office may weaken overall performance and that instead greater attention should be paid to the opportunity to decentralize operating decisions to the individual business units within each division.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1467-6486.1986.tb00933.x
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  • 9
    Digitale Medien
    Digitale Medien
    A histological analysis of the early effects of alcohol and tobacco usage on human lingual epithelium (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 14 (1985), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Macroscopically normal tongues were examined from 161 necropsies. Two types of lingual epithelium were investigated by morphometry and the results were statistically analysed in relation to known levels of alcohol and tobacco usage in each case. Alcohol and tobacco were each associated with a reduction in epithelial thickness brought about by a reduction in the maturation layer due mainly to cell shrinkage By contrast, the progenitor layer increased in size, due to hypertrophy rather than hyperplasia Changes occurred in each type of epithelium and were more severe with alcohol. There was no significant interaction between alcohol and tobacco. The structural changes appeared to be non-specific reactions to local toxic effects of alcohol and tobacco. They could, if accompanied by equivalent functional decrements, indicate an increased vulnerability to carcinogens, whether or not these derive from alcoholic drinks or tobacco smoke.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0714.1985.tb00543.x
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  • 10
    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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