Showing papers by "Fu Jen Catholic University published in 1982"

Classical differential cross sections and rotational energy transfer distributions for realistic ion—molecule potentials in the CPST limit

Abstract: Classical differential cross sections, rotational energy transfer distributions at specified scattering angles and the first moments of the rotational energy transfer distributions are calculated for two ion—molecule systems: K + −CSCl and Li + −CO. The deflection angles and change in angular momentum are calculated using classical perturbation scattering theory (CPST). Monte Carlo techniques are then used to calculate the orientation averaged total differential cross sections and the rotational energy transfer distributions. Results are compared with experiment and agreement is found to be satisfactory. These two systems represent two extremes in anisotropy. For Li + −CO a strong classical rainbow peak is still seen in the differential cross section, while in the K + −CSCl system the rainbow is complete quenched. In the rotational energy transfer distributions of both systems, rotational rainbow peaks are clearly observed. The calculations also predict a leveling off of the first moment of the rotational energy transfer distribution at high angles, corresponding to the transition to repulsive scattering. On the basis of these results some comments are made on the nature of classical rainbow scattering for anisotropic systems.

Simultaneous measurements of muscle and tendon blood flow by hydrogen gas clearance method at rest and exercise of rabbit hindlimbs

Abstract: Measurements of muscle and tendon blood flow by hydrogen gas clearance method were performed on M. tibialis anterior, M. gastrocnemius and M. soleus of the rabbit anesthetized with urethane. A wire type of Pt-Pt black electorode with 80ƒÊm in diameter was applied as the hydrogen gas sensor. With spontaneous arterial mean pressure at 84.6 mmHg, the resting blood flow (ml/min/100g) (mean•}S.E.) (n) in muscle and tendon were 21.33•}1.79 (14) and 26.60•}3.96 (12) in tibialis ant., 14.46•} 1.95 (21) and 30.49•}3.96 (12) in gastrocnemius and 12.53•}1.79 (19) and 29.83•}6.33 (8) in soleus, respectively. After exercise elicited by sciatic nerve stimulation at 1 to 5 Hz, muscle blood flow increased approximately two times above the control whereas the tendon flow showed no change or a slight decrease in some data. For the observation of the time course of blood flow, tissue temperature was measured by a needle type thermocouple. Muscle temperature increased immediately after the onset of exercise, but the same phenomenon was not observed in tendon tissue. These results indicate that the blood flow of tendon is larger than that of muscle at rest, and during exercise biomechanical tension force may affect on the regulation of tendon circulation. (J. Physical Fitness Japan 1982, 31: 41-50)