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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of a new amorphous magnet : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5535-5537 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An amorphous phase of Co3BTCA2(H2O)6 has been prepared (BTCA=1,3,5-benzenetri- carboxylate). The static properties (dc susceptibility, hysteresis) of Co3BTCA2(H2O)6 are similar to those of other "glassy'' magnetic systems, but the dynamics of Co3BTCA2(H2O)6 (absence of long relaxation times, disappearance of frequency dependence at low temperatures) are unusual. The amorphous phase is characterized by a narrow hysteresis loop at low temperature. For the hysteresis curve at 4.2 K, the coercive field is several hundred Oersted and the remnant magnetization is on the order of 10−2 Msat. The temperature dependence of the dc magnetic susceptibility shows an unusual field dependence below 30 K, with the largest effective moments being obtained in the smallest applied fields. The freezing temperature, Tf, in zero field, as determined by both dc and ac susceptibilities, has been found to be Tf=23 K. The ac susceptibility shows the characteristic spin glass frequency dependence, yet loses all frequency dependence for temperatures below 9 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355680
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, structure and magnetic studies of copper(II) and copper(I) complexes of methylpyrazines
    Amsterdam : Elsevier
    Polyhedron 12 (1993), S. 1019-1026 
    Details
    ISSN: 0277-5387
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0277-5387(00)87178-8
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  • 3
    Electronic Resource
    Electronic Resource
    An integrative study of the temperature dependence of whole animal and muscle performance during jumping and swimming in the frog Rana temporaria (1999)
    Springer
    Journal of comparative physiology 169 (1999), S. 588-596 
    Details
    ISSN: 1432-136X
    Keywords: Key words Locomotor performance ; Muscle fibre ; Power ; Thermal sensitivity ; Abbreviationsα Jump take-off angle ; θ Angle between the knee-vent line and the saggital plane ; ATP adenosine tri-phosphate ; a acceleration ; b constant used in non-linear fitting algorithm of SYSTAT ; BL body length ; c constant used in non-linear fitting algorithm of SYSTAT ; D distance covered in five consecutive jumps ; DF maximum diameter of leg at femur ( includes semimembranosus, sartorius, biceps femoralis, extensor cruris) ; DT maximum diameter of leg at tibia (gastrocnemius, peroneus, and tibialis) ; EMG electromyography ; F force produced by muscle ; FTO force in the direction of take-off ; IND individual ; LF length of femoral section of leg ; LL total leg length from hip to toe ; LP locomotory parameter ; LT length of tibial section of leg ; M body mass ; MSV mean swimming velocity ; NA data not available ; o constant used in non-linear fitting algorithm of SYSTAT ; P mean power required during jump take-off ; t time ; TE body temperature ; V jump take-off velocity ; x′ corrected jump distance ; y′ height from surface to center of mass at take-off
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The aims of this study were: (1) to analyze individual variation in frog locomotor performance, (2) to compare the thermal sensitivity of jumping and swimming, and (3) to contrast whole animal versus muscle fiber performance at different temperatures. The jumping and swimming performance of Rana temporaria was analyzed at 5, 10, 15 and 20 °C. Muscle fiber bundles were isolated from lateral gastrocnemius and subjected to the length and activation patterns thought to occur in vivo. As temperature increased, locomotor performance in R. temporaria improved with a Q 10 of 1.2 for both jump take-off velocity and mean swimming velocity. The slope of the relationship between performance and temperature (TE) was similar for both locomotor parameters and was described by the equation z-scores of locomotor performance = 0.127 × TE − 1.585. Although some frogs performed better than others relative performance was affected by locomotor type and temperature. Locomotor performance improved with temperature as the power required during take-off and the mean muscle power output increased with Q 10 values of 1.7 and 1.6 respectively. The mean muscle power output during take-off was only 34% of the calculated requirements for the whole animal, suggesting the involvement of elastic strain energy storage mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003600050259
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