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  • 1990-1994  (12)
  • 1975-1979  (16)
  • 1960-1964  (8)
  • 1950-1954  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Microwave signal processing for a cryogenic gravitational radiation antenna with a noncontacting readout (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3191-3197 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A modified version of the microwave signal processing system for the 1.5 tonne niobium bar gravitational radiation antenna at the University of Western Australia has been developed and tested during preparations for long-term observation. Among the new features of the system are a noncontacting microwave coupling to the motion transducer, cryogenic low-noise amplification, and automatic carrier suppression with improved long-term stability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144327
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  • 2
    Digitale Medien
    Digitale Medien
    Noncontacting microwave coupling to a cryogenic gravitational radiation antenna (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1905-1909 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Gravitational radiation detectors must detect extremely small displacements, and thus require elaborate vibration isolation systems to attenuate the surrounding environmental noise. Contacting electrical leads can provide a direct path that will short circuit the vibration isolation, and degrade the antenna Q factor. Noncontacting microstrip transceivers provide a practical means of electromagnetically coupling to a resonant bar gravitational antenna when a microwave transducer is used as a signal readout system. Two microwave patch antennas now operate as transceivers on the University of Western Australia's 1.5 tonne niobium bar gravitational radiation antenna and are described in detail in this paper. This system allows improved vibration isolation without degradation of the acoustic Q factor of the niobium bar. Combined with a cryogenic amplifier, this system should achieve a reduction of 57 dB in the series noise power. This corresponds to a factor of 700 reduction in the effective displacement noise when referred to the transducer, from 2×10−16 to 3×10−19 m/(square root of)Hz.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143975
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  • 3
    Digitale Medien
    Digitale Medien
    Effect on plasma lipids and lipoproteins of postmenopausal oestrogen therapy with added dydrogesterone (1990)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 97 (1990), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary. In a prospective, randomized, cross-over study, 14 postmenopausal women completed 9 months of treatment with conjugated equine oestrogens, 1.25 mg daily. Seven women added dydrogesterone 20 mg daily for 12 days during months 2, 3 and 4, and then 10 mg daily for an identical time in months 5,6 and 7. The other seven women added the two dydrogesterone doses in reverse sequence. No dydrogesterone was taken during months 8 and 9. Lipids and lipoproteins were measured before treatment and at the end of months 4, 7 and 9. Lipids were also estimated in an untreated (reference) group of eight postmenopausal women on two occasions 6 months apart; these showed significant changes in HDL2- and HDL3-cholesterol. In the treatment group, HDL-cholesterol and apolipoprotein (apo) Al were significantly higher and LDL-cholesterol and apo B were significantly lower at months 4, 7 and 9 compared with baseline values. Triglyceride levels were increased significantly over baseline values, but remained within the normal range. No significant differences between the two dydrogesterone doses were observed on any lipid and lipoprotein fraction, nor were there any differences between the oestrogen-only and oestrogen/dydrogesterone treatment phases. Dydrogesterone appears to cause little, if any, lipid and lipoprotein changes and assessment in a larger population of postmenopausal women is warranted.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1990.tb02496.x
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  • 4
    Digitale Medien
    Digitale Medien
    Predicted, actual and optimal precompetition anxiety in adolescent track and field athletes (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of medicine & science in sports 2 (1992), S. 0 
    Details
    ISSN: 1600-0838
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Sportwissenschaft
    Notizen: Anxiety was assessed in younger and older adolescent athletes in an attempt to test aspects of Hanin's zone of optimal function theory. Sixty-five participants in a track and field camp completed anxiety inventories at baseline and were instructed: 1) to recall how anxious they felt prior to their best performance and 2) to predict how anxious they would feel prior to an informal meet to be held 4 days later. Actual precompetition anxiety was assessed 1 h prior to the meet. Predicted precompetition anxiety was significantly higher than baseline and actual precompetition anxiety. Mean actual precompetition anxiety was not elevated above baseline. However, 34% (22/65) of the sample experienced high levels of precompetition anxiety, and the majority of these (17/22) reported performing optimally with high anxiety. Significant correlations between predicted and actual precompetition anxiety occurred for boys, but not for girls. The differences between predicted and actual precompetition values tended to be smaller in boys than in girls. Based on this sample, it is concluded that: 1) in accordance with the zone of optimal function theory, young athletes display considerable diversity in actual and optimal precompetition anxiety values; and 2) young athletes tend to overestimate the level of anxiety they will experience prior to an easy competition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0838.1992.tb00336.x
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  • 5
    Digitale Medien
    Digitale Medien
    Variation in Phytophthora palmivora (Butl.) Butl. on Theobroma cacao L. in West Africa (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 495-496 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The first type of isolate, referred to as the Ghanaian type, is the dominant fungal pathogen in the more westerly cocoa-growing countries of Ghana, Ivory Coast, and Sierra Leone. This type occurs occasionally in Nigeria, Southern Cameroons, Gabon and the Belgian Congo. The isolates are ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/186495b0
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  • 6
    Digitale Medien
    Digitale Medien
    Evidence of rapid changes in the Permian geomagnetic field during the Zechstein marine transgression (1977)
    [s.l.] : Nature Publishing Group
    Nature 270 (1977), S. 593-594 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Late Palaeozoic palaeomagnetic data are voluminous, largely because of the ubiquity of easily measured red beds and igneous rocks. Within these data there are systematic discrepancies and it has been suggested that the Permian geomagnetic field did not perfectly correspond to an axial dipole. ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/270593a0
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  • 7
    Digitale Medien
    Digitale Medien
    Increase in human skeletal muscle lactate produced by fenfluramine (1976)
    [s.l.] : Nature Publishing Group
    Nature 262 (1976), S. 617-617 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Human skeletal muscle was obtained at surgery for total hip joint replacement. The preparation and incubation of the tissue (in Krebs-bicarbonate buffer with added bovine serum albumin Imgrnl-1 and glucose 16.67 x 10?3 M) was carried out using the method of Kirby, Leighton and Turner5. Muscle ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/262617a0
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  • 8
    Digitale Medien
    Digitale Medien
    Modified Carbobenzyloxy Groups in Peptide Synthesis (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 487-488 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] a-Naphthyl carbinol reacted with phosgene to give a product which was coupled with glycine in the normal manner, giving carbo-a-naphthylmethoxy-glycine (found: 0,65-2; H, 5-2; N, 5-3. C14H13O4N requires: C, 64-86; H, 5-02; N, 5-41 per cent), but this material began to decompose just below its ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/167487a0
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  • 9
    Digitale Medien
    Digitale Medien
    Atomic resolution with a 600-kV electron microscope (1979)
    [s.l.] : Nature Publishing Group
    Nature 281 (1979), S. 49-51 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The electron gun incorporates a lanthanum hexaboride thermionic cathode, in the indirectly-heated rod configura tion9'10. For operation with a brightness 10 times greater than is normally obtained from a tungsten filament the cathode lifetime is regularly more than 100 h. Such brightness allows ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/281049a0
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  • 10
    Digitale Medien
    Digitale Medien
    Devonian palaeogeography of the Orcadian Basin and the Great Glen Fault (1976)
    [s.l.] : Nature Publishing Group
    Nature 259 (1976), S. 550-551 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A variety of modes of displacement have been put forward for the Great Glen Fault. Some are based on pre-Devonian evidence4'5 and are not considered relevant to our argument. We consider the following three: First, sinistral movements of 200-300 km (ref. 1) or - 500km (ref. 6). ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/259550a0
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