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  • 1
    Digitale Medien
    Digitale Medien
    Mixture distributions fitted to instrument counts (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1347-1352 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A technique for fitting mixture distributions to discrete and continuous instrument count data is presented. The use of the EM algorithm for performing maximum likelihood estimation is introduced and advantages over other methods are discussed. Equations are presented for fitting mixtures of Poisson distributions and mixtures of normal distributions. Examples of the fitting of these two types of mixture distribution are given, and it is shown how standard errors of the parameter estimates can be obtained from within the framework of the fitting process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142497
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  • 2
    Digitale Medien
    Digitale Medien
    Angular distributions of sputtered zirconium atoms (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5887-5898 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Ion beams with energies in the range 1–2 keV are used to sputter neutral Zr atoms from a polycrystalline surface. Laser induced fluorescence detection is used to obtain angular distributions of sputtered neutrals as a function of ion impact direction, ion mass, ion energy, and spin–orbit state of the exiting atoms. About 40% of the sputtered atoms are excited. Angular distributions depend weakly on ion mass and energy. The angular distributions are fitted well by a modified form of the Roosendaal and Saunders model of sputtering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.464880
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  • 3
    Digitale Medien
    Digitale Medien
    An instrument for measuring angular distribution of sputtered neutral atoms (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 452-459 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An apparatus utilizing laser-induced fluorescence (LIF) has been developed to measure high-resolution angular distributions of sputtered neutral atoms. LIF provides sensitive detection, a feature necessary to monitor the low atomic fluxes inherent to angularly resolved sputtering measurements in the static sputtering regime. The apparatus incorporates a detector assembly which rotates about the sample in an ultrahigh vacuum (UHV) chamber, allowing a large range of angular measurements at different ion beam incidence angles. Laser light is brought to the detector in the UHV chamber via a single optical fiber and fluorescence photons exit the chamber via a fiber bundle. The optical fiber and fiber bundle are mounted in a fixed orientation on the detector, maintaining constant alignment as the assembly rotates. Angular resolution in the polar plane containing the incident ion beam and the surface normal is better than 3°. Angular resolution in the direction perpendicular to the polar plane is governed by the Doppler shift and is 0.028° for 3.2 eV atoms. Overall detection efficiency is estimated to be 5×10−9 counts per sputtered atom and 2×10−3 counts per atom entering the detection volume. Initial experiments using polycrystalline Zr to characterize the device are described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144215
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  • 4
    Digitale Medien
    Digitale Medien
    Plasma protein levels in normal human fetuses: 13 to 41 weeks' gestation (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Objective To establish reference ranges for the levels of alpha-fetoprotein, albumin, prealbumin (transthyretin) alpha-1-antitrypsin, transferrin, ceruloplasmin and total protein in the plasma of normal human fetuses and newborn babies.Design Prospective study of individual normal cases to fulfil objectives.Setting Pathology laboratories of the University of Edinburgh and the biochemistry laboratories of the University of Keele.Subjects Twenty-two normal fetuses 13 to 22 weeks of gestation and 66 babies born between 24 and 41 weeks gestation.Results Albumin is the predominant plasma protein throughout gestation. The levels of alpha-fetoprotein and prealbumin fell significantly with increasing gestation, whereas the concentrations of the other proteins studied increased. The ratios of individual proteins to total protein demonstrated similar trends.Conclusions This study provides developmental profiles of normal human fetal plasma proteins to serve as possible reference data for abnormal fetuses. Declining levels of prealbumin (transthyretin) were unexpected and suggest a functional role for this protein in early pregnancy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb14313.x
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  • 5
    Digitale Medien
    Digitale Medien
    The winter hardiness of Festuca rubra, Holcus lanatus and Agrostis spp. in comparison with Lolium perenne (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 39 (1984), S. 0 
    Details
    ISSN: 1365-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Preliminary experiments were conducted to assess the winter hardiness of representative cultivars or populations of Festuca rubra, Holcus lanatus and Agrostis spp. in comparison with a hardy (Premo) and a susceptible (Grasslands Ruanui) cultivar of Lolium perenne. Two controlled-environment tests and a field experiment including two cutting and two fertilizer managements are reported.Grasslands Ruanui andH lanatus suffered most damage in all tests. In the controlled-environment experiments, Premo was at least as hardy as the F. rubra and Agrostis cultivars but in the field Premo was more susceptible. Spring growth of Premo was affected more by the cutting and fertilizer managements applied the previous summer and autumn than was spring growth of F. rubra or Agrostis spp.It was concluded that, whereas use off. F. rubra or Agrostis spp. should not be limited by fears of winter damage, poor winter hardiness may limit the value of H. lanatus for hill and upland reseeding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2494.1984.tb01710.x
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  • 6
    Digitale Medien
    Digitale Medien
    Selective dry etching of silicon with respect to germanium (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1436-1438 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe a plasma-based dry etching procedure which permits selective etching of Si over Ge with a Si/Ge etch rate ratio of over 70 and negligible etching of the Ge underlayer. This is achieved in a SF6/H2/CF4 gas mixture by the formation of a thin ((approximately-equal-to)3 nm) involatile etch stop layer on the Ge surface which consists of Ge-sulfide and carbonaceous material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102490
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  • 7
    Digitale Medien
    Digitale Medien
    Membership of associations and free-riders (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Industrial relations journal 12 (1981), S. 0 
    Details
    ISSN: 1468-2338
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: In this article the author, using case study material, considers the motives which induce individuals either to join associations or to free-ride. In particular, he concludes that analysis and thinking on the free-rider problem needs to be pursued in a specific, well defined manner.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1468-2338.1981.tb00386.x
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  • 8
    Digitale Medien
    Digitale Medien
    Potential antisecretory antidiarrheals. 2. .alpha.2-Adrenergic 2-[(aryloxy)alkyl]imidazolines (1990)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 33 (1990), S. 614-626 
    Details
    ISSN: 1520-4804
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jm00164a024
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  • 9
    Digitale Medien
    Digitale Medien
    Patterns of tooth vulnerability to caries in South African high school pupils (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Community dentistry and oral epidemiology 8 (1980), S. 0 
    Details
    ISSN: 1600-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Caries prevalence and distributions were studied in 761 South African high school pupils aged 17 years in four ethnic groups, living in urban (low F) and rural (low and high F) areas. Mean DMFT values were significantly higher among White pupils than all other groups. Comparison of mean DMFT among the Black pupils showed that urban Black dwellers had a significantly higher score than rural pupils when caries-free individuals were included in the analysis, but not when scores for only those with a DMFT of 1 or more were compared. No significant differences were found between the DMFT values of Black rural pupils living in high or low fluoride areas. Among Black rural pupils, dental caries was approximately three times more common in permanent second molars compared with permanent first molars. In urbanized Black, Coloured, Indian and White subjects, the molars were approximately equally affected.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0528.1980.tb01287.x
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  • 10
    Digitale Medien
    Digitale Medien
    Primary dentition caries trends, 1976–1981, in four South African populations (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Community dentistry and oral epidemiology 11 (1983), S. 0 
    Details
    ISSN: 1600-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract— This paper is a comparison of cross-sectional data on dental caries in the primary dentition undertaken between 1976 and 1981 in the Transvaal Province, South Africa, on 690 rural Black, 1463 urban Black, 870 Indian and 1622 White children aged 2–5 yr. There was a decrease in percentage dental caries prevalence in the urban White children and an increase in the other three groups, the fastest rate being seen among urban Indian children. Similar trends were noted for mean dmft. Dental caries in incisor and canine teeth remained fairly static but caries in molar teeth increased in the groups of Black and Indian children and decreased in the White children. Ratios d/dmft, m/dmft and f/dmft indicated that minimal treatment was received by all the children.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0528.1983.tb01900.x
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