For some repeatedly occurring failure with root cause,the reliability centered maintenance(RCM)can’t deal with them effectively.So,the logic diagram of RCM was improved by combining it with proactive maintenance tech...For some repeatedly occurring failure with root cause,the reliability centered maintenance(RCM)can’t deal with them effectively.So,the logic diagram of RCM was improved by combining it with proactive maintenance technology.First,root cause analysis is used to build a key result-cause chain of the repeatedly occur failure.Then,a reasonable link in the chain,which work station is suitable to be monitored and repaired,should be selected.Finally,the corresponding proactive maintenance measure should be adopted to prevent the matter occur on the chain and broken the key result-cause chain,and the repeatedly occur failure is to be prevent at a deeper level or from the root cause.By doing this,a system engineering method comes into being,not only it can determine the needs of preventive maintenance for equipment,but also determine the proactive maintenance needs for equipment.The analysis result of reliability centered maintenance and the analysis result considering proactive maintenance are combined to form a maintenance guideline containing proactive maintenance strategy.展开更多
Al2O3/YSZ composite ceramics was fabricated with combustion synthesis technology, and the influences of mechanical vibration on its microstructures and properties were investigated. It is found that under the mechanic...Al2O3/YSZ composite ceramics was fabricated with combustion synthesis technology, and the influences of mechanical vibration on its microstructures and properties were investigated. It is found that under the mechanical vibration of ever-increasing frequency, increasing combustion temperature, accelerating ceramics/metal liquid-liquid separation and quickening ceramic solidification could not only reduce the average diameter and the size distribution of aligned ZrO2 nano-micron fibers in rod-shaped Al2O3 matrix grains, but also make the randomly-oriented rod-shaped grains finer and increase their aspect ratios. As a result, a remarkable increase in flexural strength and fracture toughness of the ceramics can be observed.展开更多
Objective: To observe the effect of electro-scalp acupuncture on glucose metabolism of cerebral regions involving mental activity in healthy people. Methods: A total of 6 cases of volunteer healthy subjects (3 males a...Objective: To observe the effect of electro-scalp acupuncture on glucose metabolism of cerebral regions involving mental activity in healthy people. Methods: A total of 6 cases of volunteer healthy subjects (3 males and 3 females) ranging in age from 22 to 36 years were subjected to this study. Changes of cerebral glucose metabolism before and after electro-scalp acupuncture were observed by using positron emission tomography (PET) and semi-quantifying analysis method. Electro-scalp acupuncture stimulation (50 Hz, 2 mA) of Middle Line of Vertex (Ding zhongxian,顶中线,MS5), Middle Line of Forehead (Ezhongxian, 额中线,MS1) and bilateral Lateral Line 1 of Forehead (Epangyixian,额旁一线,MS2) was administered for 30 minutes. Then cerebral regions of interest (ROIs) were chosen and their average glucose metabolism levels (radioactivity of 18 fluorine deoxyglucose) were analyzed. Results: After administration of electro-scalp acupuncture, the glucose metabolism levels in bilateral frontal lobes and bilateral caudate nuclei, left cingulate gyrus and right cerebellum increased significantly in comparison with those of pre stimulation (P<0.05). Conclusion: Electro-scalp acupuncture of MSI, MS2 and MS5 can increase the glucose metabolism of certain cerebral regions involving mental activity in healthy subjects.展开更多
文摘For some repeatedly occurring failure with root cause,the reliability centered maintenance(RCM)can’t deal with them effectively.So,the logic diagram of RCM was improved by combining it with proactive maintenance technology.First,root cause analysis is used to build a key result-cause chain of the repeatedly occur failure.Then,a reasonable link in the chain,which work station is suitable to be monitored and repaired,should be selected.Finally,the corresponding proactive maintenance measure should be adopted to prevent the matter occur on the chain and broken the key result-cause chain,and the repeatedly occur failure is to be prevent at a deeper level or from the root cause.By doing this,a system engineering method comes into being,not only it can determine the needs of preventive maintenance for equipment,but also determine the proactive maintenance needs for equipment.The analysis result of reliability centered maintenance and the analysis result considering proactive maintenance are combined to form a maintenance guideline containing proactive maintenance strategy.
基金National Natural Science Foundation of China (50672131)
文摘Al2O3/YSZ composite ceramics was fabricated with combustion synthesis technology, and the influences of mechanical vibration on its microstructures and properties were investigated. It is found that under the mechanical vibration of ever-increasing frequency, increasing combustion temperature, accelerating ceramics/metal liquid-liquid separation and quickening ceramic solidification could not only reduce the average diameter and the size distribution of aligned ZrO2 nano-micron fibers in rod-shaped Al2O3 matrix grains, but also make the randomly-oriented rod-shaped grains finer and increase their aspect ratios. As a result, a remarkable increase in flexural strength and fracture toughness of the ceramics can be observed.
基金Subsidized by National Nature Science Foundation of China(30100246)
文摘Objective: To observe the effect of electro-scalp acupuncture on glucose metabolism of cerebral regions involving mental activity in healthy people. Methods: A total of 6 cases of volunteer healthy subjects (3 males and 3 females) ranging in age from 22 to 36 years were subjected to this study. Changes of cerebral glucose metabolism before and after electro-scalp acupuncture were observed by using positron emission tomography (PET) and semi-quantifying analysis method. Electro-scalp acupuncture stimulation (50 Hz, 2 mA) of Middle Line of Vertex (Ding zhongxian,顶中线,MS5), Middle Line of Forehead (Ezhongxian, 额中线,MS1) and bilateral Lateral Line 1 of Forehead (Epangyixian,额旁一线,MS2) was administered for 30 minutes. Then cerebral regions of interest (ROIs) were chosen and their average glucose metabolism levels (radioactivity of 18 fluorine deoxyglucose) were analyzed. Results: After administration of electro-scalp acupuncture, the glucose metabolism levels in bilateral frontal lobes and bilateral caudate nuclei, left cingulate gyrus and right cerebellum increased significantly in comparison with those of pre stimulation (P<0.05). Conclusion: Electro-scalp acupuncture of MSI, MS2 and MS5 can increase the glucose metabolism of certain cerebral regions involving mental activity in healthy subjects.
