Magneto-resistance Effect and Electric Resistance of Single Crystals of Cobalt

The preparation of long bar specimens of single crystals of close-packed hexagonal cobalt, about 10 cm long, was succeeded for the first time by the present authors, and with these crystals, the anisotropy of electrical resistivity and the magneto-resistance effect were measured up to the field of 1000 Oe. It was found that the specific electrical resistivity was largest in the direction of c-axis and smallest in the direction perpendicular to the axis, being 10.280×10^Ω-cm and 5.544×10^Ω-cm, respectively, and the values of ΔR/R were about 0.4 per cent and about 0.2 per cent the respective directions

Thermal Expansion and Temperature Dependence of Young\u27s Modulus of Single Crystal of Hexagonal Cobalt

By using a dilatometer and a vibrator-controlled oscillator system, the thermal expansion and Young\u27s modulus of single crystals of hexagonal cobalt in a long cylindrical form were measured at temperatures ranging over from -100°to 350℃. From the measured values and the known values of compressibility, the elastic parameter, the elastic constant and the rigidity modulus were calculated. The thermal expansion coefficient, Young\u27s modulus and the rigidity modulus were also calculated for polycrystal, the results of which were in good agreement with the values measured for the polycrystal specimens prepared from the melt

Training effects on physical fitness of middle-aged women in promotional class of health : Comparison between endurance, muscular strength training and flexibility, skill training

The purpose of this study was to estimate the effects of long-term physical training on physical fitness of middle-aged women. Forty-seven subjects were classified into four groups, that is, 1) 40G1 (aged 40-49 years, group for endurance and muscular strength training), 2) 50G1 (aged 50-59 years, group for endurance and muscular strength training), 3) 40G2 (aged 40-49 years, group for flexibility and skill training), and 4) 50G2 (aged 50-59 years, group for flexibility and skill training). The training program was conducted once a week during six months. Before and after the training period, medical and physical fitness tests and a bicycle ergometer test were conducted for all subjects. The results of training effect are summarized as follows: 1) Decreasing of resting heart rate was not found in all groups. 2) Decreasing of systolic and diastolic blood pressure was found in 40G1,50G1 and 50G2 groups. 3) Decreasing of body fat (0.000000at) was found in all groups. In specific, decreasing in 40G2 group was statistically significant. 4) Significant increasing of side step was found in 40G1, 50G1 and 50G2 groups. 5) Increasing of vertical jump was found in 40G1 and 40G2 group. 6) Increasing of grip strength was not found to in all groups. 7) Increasing of zig-zag dribble was found in 50 years groups. 8) Decreasing of time in fast walk was found in all groups. In specific, decreasing in 50 years group was statistically significant. 9) The increasing rate of heart rate in bicycle ergometer test decreased in 50G1,40G2 and 50G2 groups. 10) The recovering rate of heart rate in ergometer test increased in 40G1,50G1 and 40G2 groups