No abstract

Coronary artery disease (CAD) isbaseline data for each patient. All patients underwent cardioangiography and were divided into four groups according to their Gensini scores: a control group, and groups with a mild, moderate, or severe degree of stenosis. One hundred and five of these patients simultaneously underwent angiography of the lower extremities and were divided into four groups according to the degree of artery stenosis: a control group, and groups with a mild, moderate, or severe degree of stenosis. Grouping of baPWV levels was made according to Japanese surveys. Bilateral baPWV and ABI were measured using non-invasive arterial atherosclerosis measuring equipment. In the coronary artery groups based on Gensini score, ABI in the group with a high degree of stenosis was significantly lower than that in the control and moderate stenosis groups, while the baPWV was significantly higher than that in the control and mild stenosis groups. In the grouping of baPWV levels, it was indicated that the ABI level was significantly different between each group. The ABI <0.9 in groups with baPWV <1,400 cm/s and >2,100 cm/s was higher than that in other groups. In the grouping by angiography of the lower extremities, the ABI level was decreased with increasing degree of artery stenosis while the baPWV levels were increased under the same circumstance (p <0.05 or p <0.01). Logistic regression analysis indicated that relatively low ABI, high baPWV, abnormal fasting blood glucose, and smoking were independent risk factors for the development of cardiovascular diseases. The simultaneous measurement of bilateral baPWV and ABI using the newly developed equipment presented herein is

In practice, the sliding speed is an important parameter for materials applied in sliding condition. We have conducted an experimental study to explore the effect of sliding speed on friction and wear performance of a copper-graphite composite. The sliding tests were carried out over a wide range of speeds with a pin-on-disc configuration. The results show that there is a critical speed at which there is a transition of the friction and wear regimes of the composite. In addition, the formation of a lubricant layer on the contact surface (surface modification) determines the actual tribological performance of the composite. The wear mechanisms in different wear regimes are also discussed.