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  • 1
    Digitale Medien
    Digitale Medien
    Evaluation of Gb/s laser based fibre LAN links: Review of the Gigabit Ethernet model (2000)
    Springer
    Optical and quantum electronics 32 (2000), S. 169-192 
    Details
    ISSN: 1572-817X
    Schlagwort(e): Gigabit Ethernet ; modal bandwidth ; multimode fibre ; singlemode fibre
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The theoretical model used by Gigabit Ethernet to develop the optical physical layer specifications is presented. The model calculates the penalties associated with using laser based transceivers on both multimode and singlemode fibre Gb/s links. Experimental verification of the model's predictions is also presented along with discussion on the use of the model to predict link performance. The model is generic to laser based fibre LAN links but specific details and examples relevant to Gigabit Ethernet are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007039323552
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Strength training alters contractile properties of the triceps brachii in men aged 65–78 years (1993)
    Springer
    European journal of applied physiology 66 (1993), S. 275-280 
    Details
    ISSN: 1439-6327
    Schlagwort(e): Muscle ; Ageing ; Time to peak tension ; Electrical stimulation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Voluntary and electrically evoked contractile properties were studied in the triceps brachii following a 24-week dynamic stength training program in ten men aged 65–78 years. Eight men of a similar age were control subjects. A resistance overload program was undertaken three times per week with subjects performing four sets of six to eight repetitions at 80% of their one repetition maximum (1RM). Maximum voluntary contraction (MVC) and contractile properties were measured at 0, 12, and 24 weeks in the exercise group and at 0 and 24 weeks in the controls. The 1RM was used to assess dynamic strength at 0 and 24 weeks in the exercise group. Contractile measures consisted of supramaximal isometric twitch and post-activation twitch parameters. Muscle size was estimated from anthropometric measurements. Compared with the control group, the exercise group MVC increased by about 20% and time to peak tension was slowed by about 11%. Also in the exercise group the peak rate of torque development of the potentiated twitch was reduced by about 10%. Twitch potentiation was substantial in both groups (about 140%) and unaffected by training. The 1 RM increased by about 30%, and there was a non-singificant positive change of 8.6% in the muscle plus bone cross-sectional area in the exercise group. The results show that the force generating capacity of the triceps brachii in these men can be significantly improved for up to 24 weeks using concentric overload training. Furthermore, the finding of slowed twitch properties and no change in peak twitch amplitude substantiate and extend the limited data currently available on intrinsic contractile changes in the elderly. Mechanisms responsible for slowed twitch properties and their functional significance following strength training in aged men remain uncertain.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235106
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