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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of a new sorbent for use in the determination of volatile, complex-forming organic compounds in air (1984)
    s.l. : American Chemical Society
    Analytical chemistry 56 (1984), S. 2523-2528 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00277a058
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  • 2
    Electronic Resource
    Electronic Resource
    MRI – From basic knowledge to advanced strategies: Hardware (1999)
    Springer
    European radiology 9 (1999), S. 1015-1019 
    Details
    ISSN: 1432-1084
    Keywords: Key words: MRI ; Hardware ; Magnet ; Gradients ; Imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. There have been remarkable advances in the hardware used for nuclear magnetic resonance imaging scanners. These advances have enabled an extraordinary range of sophisticated magnetic resonance MR sequences to be performed routinely. This paper focuses on the following particular aspects: (a) Magnet system. Advances in magnet technology have allowed superconducting magnets which are low maintenance and have excellent homogeneity and very small stray field footprints. (b) Gradient system. Optimisation of gradient design has allowed gradient coils which provide excellent field for spatial encoding, have reduced diameter and have technology to minimise the effects of eddy currents. These coils can now routinely provide the strength and switching rate required by modern imaging methods. (c) Radio-frequency (RF) system. The advances in digital electronics can now provide RF electronics which have low noise characteristics, high accuracy and improved stability, which are all essential to the formation of excellent images. The use of surface coils has increased with the availability of phased-array systems, which are ideal for spinal work. (d) Computer system. The largest advance in technology has been in the supporting computer hardware which is now affordable, reliable and with performance to match the processing requirements demanded by present imaging sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050787
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  • 3
    Electronic Resource
    Electronic Resource
    The optimum distribution of counting times for determining integrated intensities with a diffractometer (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 201-204 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: For a given total counting time in a diffractometer experiment the variance (or square of the standard deviation) of the estimated integrated intensity of a reflexion is least when the counting time at each point is proportional to the square root of the intensity at that point. If the ratio of the peak to background intensity does not exceed 10 and data points are equidistant, a constant counting time at each point gives a variance not more than 1.4 times the minimum possible value. For greater peak/background ratios a further improvement in variance is achieved. The effect of subtracting off the background intensity is equivalent to regarding the line as extended, at background intensity, over a further range equal to the range over which measurements are made. Full advantage of the optimum choice can be obtained by computer control of the diffractometer, and then less time is required for collection of data of the same accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000471
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Production of Electron-Positron Pairs (1935)
    [s.l.] : Nature Publishing Group
    Nature 135 (1935), S. 66-66 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE production of a pair of positive and negative electrons by two photons was one of the consequences of his theory of the electron first considered by Dirac. This effect is essentially at the basis of all pair production phenomena, and it may be of interest to point out that from the formula ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/135066a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Statistical Analysis of Results for Successive Tests on the same Organism (1950)
    [s.l.] : Nature Publishing Group
    Nature 166 (1950), S. 319-319 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the experiment under consideration, the animals were divided into two groups, one treated and one untreated. The treatment was continued over four experimental periods, during each of which measurements of various physical characters were taken for each animal. In determining the treatment ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/166319a0
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  • 6
    Electronic Resource
    Electronic Resource
    Different Forms of Rh Antibodies (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 414-415 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table l. TESTS FOR DETECTION OF Rh ANTIBODIES Serum- albumin Indirect Saline Wiener Type of Rh antibody conglut- Coombs agglut- blocking ination test test ination test Bivalent antibody Rh agglutinin _(- - -f _ Univalent antibodies 1. Glutinins _ _ 2. Blocking for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169414a0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence for Transformation of Mesotrons into Electrons (1940)
    [s.l.] : Nature Publishing Group
    Nature 145 (1940), S. 102-103 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ONE of the outstanding questions regarding the mesotron is that of its ultimate fate. Certain properties of this particle are remarkably like those of the hypothetical particle assumed by Yukawa in his theory of nuclear forces and β-disintegration, and this has led to the view that the two may ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/145102a0
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  • 8
    Electronic Resource
    Electronic Resource
    Transformation of Mesotrons into Electrons (1940)
    [s.l.] : Nature Publishing Group
    Nature 145 (1940), S. 818-819 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EVIDENCE for the transformation of mesotrons into electrons was recently reported in these columns1. This was obtained by the use of the cloud chamber, and consisted in the observation of a fast electron track emanating from the end of the track of a mesotron. What appears to be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/145818a0
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  • 9
    Electronic Resource
    Electronic Resource
    Scattering of Hard Gamma Rays by Lead, and the Annihilation of Positive Electron (1934)
    [s.l.] : Nature Publishing Group
    Nature 133 (1934), S. 415-415 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE following experiment was carried out to make a further test of the hypothesis, proposed by Blackett and Occhialini, that the ‘nuclear’ scattering of hard γ-rays by heavy elements is due to the annihilation of positive electrons produced by the γ-rays1. γ-rays from an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/133415a0
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  • 10
    Electronic Resource
    Electronic Resource
    Scattering of Hard γ-Rays and Annihilation Radiation (1935)
    [s.l.] : Nature Publishing Group
    Nature 135 (1935), S. 266-266 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To determine the relative importance of the annihilation of positive electrons in the phenomenon of the ‘scattering’ of hard γ-rays, observations were made on the secondary γ-radiation from thin lead foils irradiated with thorium C″ γ-rays (25 mgm.). With a scattering angle of about 140°, 0.8 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/135266a0
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