Effect of training program based on anaerobic threshold in the early phase after acute myocardial infarction

We devised a new physical training program on the basis of anaerobic threshold for rehabilitation in the early phase of acute myocardial infarction. Forty-four patients were divided into two groups, control and training. We measured the left ventricular ejection fraction using nuclear stethoscopy during the treadmill test and calculating radioactive cardiac output. In the training group, anaerobic threshold and exercise time to the anaerobic threshold point were significantly increased, and stroke volume at rest measured by the dye dilution method increased significantly. Radioactive cardiac output during exercise also increased after the exercise therapy. These results indicate that the rehabilitation program consisting of physical training based on the anaerobic threshold is effective.     

High-sensitivity Hi-Lo germanium avalanche photodiode for 1.5 ?m-wavelength optical communication

A high-sensitivity small-detectable-area Hi-Lo germanium avalanche photodiode (Ge APD) was developed for use in 1.55 ?m wavelength optical communication systems. This device has Hi-Lo (p+nn?) impurity profile. Its detectable area is 30 ?m in diameter for single-mode optical-fibre use. The minimum average received signal level obtained was ?40.5 dBm (at 450 Mbit/s, ? = 1.55 ?m, BER = 10?9, return-to-zero). This is 0.7 dB better than the value for the 80?m diameter similar structure Ge APD.     

Free D-serine, D-aspartate and D-alanine in central nervous system and serum in mutant mice lacking D-amino acid oxidase

We have examined whether D-amino acid oxidase (DAO) regulates free D-serine content using mutant ddY/DAO- mice lacking DAO activity. We find that the content of D-serine in the serum and cerebellum of mutant mice is much higher than that of normal mice, whereas a slight but significant difference in the cerebral D-serine level is observed between the two strains. These results suggest that, although DAO may participate in the catabolism of D-serine in the cerebellum and periphery, there appears to be other mechanisms for catabolism of endogenous D-serine in the brain.     

Automatic Small Motor Noise Measuring Equipment

Measuring equipment for automatically testing the noise of small fan induction motors used in domestic appliances has been developed. This equipment has taken the place of the current inspection method, which uses man's trained sense of hearing. In order to develop this equipment, the following investigations were performed. First, through acoustic and vibration analysis, we clarified that various noises have their own characteristics of sound frequency which were found to be very similar to the characteristics of vibration frequency detected by a vibration sensor, mounted on the motor frame surface. Secondly, through the consideration of the relations between the levels of noise and vibration and man's sense of hearing, we obtained a satisfactory mutual relationship between man's sense and vibration levels. By using these clarifications, we have succeeded in making automatic measuring equipment which judges the noise level and the kind of noise, using a microcomputer with programs based on the investigations. Thus two results have been produced. One is the saving of labor and time in the motor manufacturing process, the other is improved accuracy and convenient trouble-free testing in noisy surroundings.     

Development of the new polymer insulating materials for HVDC cable

The properties of modified HDPE, selected from various polymer materials by evaluations of DC characteristics, were examined in both sheet and cable samples. It was found that the modification, which introduced a small amount of polar group into HDPE, considerably enhanced DC breakdown strength to as high as 1.5-2.0 times those of XLPE (cross-linked polyethylene). Under a poling voltage of up to 30 kV/mm, the modified HDPE exhibits particular behavior, with its space charge decreasing as stress is increasing. In addition, the additives in HDPE have a large influence on space-charge characteristics, thereby affecting the DC breakdown strength. The evaluation of cable insulated with optimum modified HDPE was conducted to determine the breakdown strength under various voltage applications. Compared with the XLPE cable, modified HDPE cable exhibited excellent characteristics under all kinds of voltage applications, particularly DC dielectric breakdown strength, which was almost twice that of XLPE     

Infrared light charge injector as a tool for the study of silicon detectors

In order to study the local response of silicon strip detectors, we have developed a local charge generator using near-infrared ligh emitting diode. The edge properties of the strip detectors were studied precisely with this tool. In the case of our tested detector, the lateral extension of the depletion area was measured to be about 120 μm at a bias voltage of 40 V.     

28—THE LOSS OF CRIMP AND CRIMP RECOVERY OF WOOL FIBRES DURING HIGH-SPEED WORSTED SPINNING

Wool fibres are subjected to severe mechanical actions during the worsted-spinning process, especially on a high-speed system. The loss of crimp and crimp recovery of single wool fibres are examined by measuring the crimp shrinkage of single fibres and the bulkiness of fibre bundles sampled at various stages in a commonly used worsted-spinning system. It is found that the crimp and crimp recovery of single fibres gradually decrease with progress through the spinning system, the reduction being particularly noticeable during carding. Fibre bundles with a high crimp level showed greater bulkiness.     

Electron diffraction study of flake graphite extracted from molten pig iron

Single graphite flakes segregated from molten carbon or silicon-rich iron at 1200° to 1500°C were subjected to electron diffraction experiments. The results indicated that the well developed thick flakes are composed of one single crystal, while the thin almost colorless flakes consist of two or three single crystals oriented with the basal plane parallel to the flake surface and rotated at an angle of 15°, 18°, 22°, 25° or 28° about the C-axis. The stacking of the atomic layers in each single crystal indicates that they are α and β-type, or a more disordered structure, at each instant. Double diffraction evidence and additional electron microdiffraction observations showed that the thin single flake has an aggregate structure with two close-packed single crystals.     

Selective hydrogenation of oleic acid to 9-octadecen-1-ol: Catalyst preparation and optimum reaction conditions

A new catalyst, ruthenium-tin-alumina is found to selectively hydrogenate oleic acid to 9-octadecen-1-ol (oleyl + elaidyl alcohol) at low pressure with high yield. Catalyst preparation methods, catalyst raw materials and activation conditions have a significant effect on the activity of the catalyst. The optimum atomic ratio of ruthenium to tin is about 1:2. Catalyst prepared by an improved sol-gel method shows higher activity and selectivity than catalysts prepared by impregnation and coprecipitation methods. Chloride is found to have a negative effect on catalytic activity. The best catalyst is prepared from chloride-free ruthenium and tin raw materials. Under the optimum reaction conditions of 250°C and 5.6 MPa, the selectivities for 9-octadecen-1-ol and total alcohol (9-octadecen-1-ol + stearyl alcohol) formation are 80.9% and 97%, respectively, at a conversion of 81.3%.