Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angularextrusion(ECAE) in semi-solid isothermal treatment was investigated. The results show that withincreasing semi-solid isothermal treatment te...Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angularextrusion(ECAE) in semi-solid isothermal treatment was investigated. The results show that withincreasing semi-solid isothermal treatment temperature, the a phase solid grain size of processedMg-Al-Zn alloy by ECAE increases firstly due to coarsening of a phase solid grains, then decreasesdue to melting of a phase solid grains. With the increase of extrusion passes during ECAE, the aphase solid grain size in the following semi-solid isothermal treatment decreases. The a phase solidgrain size of processed Mg-Al-Zn alloy by ECAE under route B_C is the smallest, while the a phasesolid grain size of processed material by ECAE under route A is the largest. The primary mechanismof spheroid formation depends on the melting of recrystallizing boundaries and diffusion of soluteatoms in the semi-solid state.展开更多
In recent years, there has been mounting interest i n measuring process performance in manufacturing industry. Based on analyzing the process capability indices, a production department can trace and improve a poor pr...In recent years, there has been mounting interest i n measuring process performance in manufacturing industry. Based on analyzing the process capability indices, a production department can trace and improve a poor process to enhance quality levels and satisfy customers. The process capabilit y analysis can also serve as an important reference for making decisions for imp roving the global quality of all products. Since C p and C pk are failed to account for process centering, the index C pm is developed. The index C pm takes the process centering into consideration and is su itable for the processes with nominal-the-best type. There are other indices l ike C pu and C pl, and those indices are used for unilateral s pecification processes. Chou (1994) developed a procedure using estimators of C p, C pu and C pl for practitioners to determine whether two p rocesses are equal capability or not. For bilateral specifications processes, i ndex C p is failed to measure process yield and process centering. Thus, th e index C pm is used to develop a similar procedure for practitioners t o determine whether two processes are equal capability or not. The decisions mad e using the procedure to select the better supplier are, of course, more reliabl e.展开更多
As one of the major projects of GAME (GEWEX Asian Monsoon Experiment), the GAME\|Tibet aimed to mainly examine the energy and water cycle in Tibetan Plateau and its effects on Asian monsoon. In this paper, based on th...As one of the major projects of GAME (GEWEX Asian Monsoon Experiment), the GAME\|Tibet aimed to mainly examine the energy and water cycle in Tibetan Plateau and its effects on Asian monsoon. In this paper, based on the in\|situ high\|resolution observation data of GAME\|Tibet, the soil energy\|moisture distribution and the melting\|freezing progresses and their effects on seasonal shift were preliminarily discussed.The soil energy\|water distribution and freezing\|melting processes varied at different sites in northern part of Tibetan Plateau. The temporal and spatial variation of the soil moisture content is more complex than that of temperature. The soil moisture content increased with depth in certain layers but decreased in other layers. The freezing and melting processes and the temperature distribution were largely influenced by the existence of higher soil moisture content layer. During summer monsoon, the soil moisture at 10cm at all sites is relatively high, but the spatial difference existed. Generally speaking, the shallow layers start to freeze in October and to melt from April at all sites, with about 6 months frozen period. However, the beginning time of freezing\|melting and frozen period varied at different sites.展开更多
Bio-sensor arrays for multi-channel recording have been developed recently and signal processing platforms for those signals have been studied actively.But it’s thereal situation which these technologies are generall...Bio-sensor arrays for multi-channel recording have been developed recently and signal processing platforms for those signals have been studied actively.But it’s thereal situation which these technologies are generally developed and studied respectively.So the interface design between recording array and signal processing platform is also an important issue to make bio-sensor signal processing system.In this paper,we proposed interface which has unique protocols to control sensor array and operate platform.There are two types of protocols in the interface.One is between sensor array and MCU in platform and the other is between MCU and board for wireless communication.Basically,each protocol has two kinds of modes(single,frame)and it can be extended if needed.展开更多
The recognition of surgical processes in the operating room is an emerging research field in medical engineering. We present the design and implementation of a instrument localization system that is based on informati...The recognition of surgical processes in the operating room is an emerging research field in medical engineering. We present the design and implementation of a instrument localization system that is based on information fusion strategies to enhance its recognition power. The system was implemented using RFID technology. It monitored the presence of surgical tools in the interventional site and the instrument tray and combined the measured information by applying redundant, complementary, and cooperative information fusion strategy to achieve a more comprehensive model of the current situation. An evaluation study was performed that showed a correct classification rate of 97% for the system.展开更多
目的:探讨健康教育与健康促进(PRECEDE-PROCEED)模式多维度健康干预对血脂异常老年人的应用效果。方法:选择2020年5月至2021年5月中南大学湘雅医学院附属海口医院体检中心检查出存在血脂异常的110名老年患者,按照随机数表法分成对照组...目的:探讨健康教育与健康促进(PRECEDE-PROCEED)模式多维度健康干预对血脂异常老年人的应用效果。方法:选择2020年5月至2021年5月中南大学湘雅医学院附属海口医院体检中心检查出存在血脂异常的110名老年患者,按照随机数表法分成对照组与研究组,每组55例。对照组采用常规干预措施,研究组采用PRECEDE-PROCEED模式多维度健康干预措施。对比分析2组干预前及干预3个月后的血脂水平[总胆固醇(total cholesterol,TC)、三酰甘油(triglyceride,TG)、高密度脂蛋白(high-density lipoprotein,HDL)、低密度脂蛋白(low-density lipoprotein,LDL)]、体重指数(body mass index,BMI)、不良生活方式发生率及生活质量评分,并评估2组患者干预效果。结果:干预后,2组TC、TG、HDL、LDL均较干预前明显降低,且研究组明显低于对照组,差异有统计学意义(P<0.05);干预后,2组BMI中肥胖、超重、偏瘦的发生率均较干预前降低,且研究组明显低于对照组,差异有统计学意义(P<0.05);干预后,2组BMI正常的占比均较干预前升高,且研究组明显高于对照组,差异有统计学意义(P<0.05);干预后,2组不良生活方式中吸烟、饮酒、饮食不均衡、运动不达标的发生率均较干预前降低,且研究组明显低于对照组,差异有统计学意义(P<0.05);干预后,2组简明健康调查量表(36-items Short Form Health Survey,SF-36)中的躯体功能、生理功能、情绪功能、社会功能评分均较干预前明显升高,且研究组明显高于对照组,差异均有统计学意义(P<0.05);研究组干预总有效率明显高于对照组,差异有统计学意义(P<0.05)。结论:PRECEDE-PROCEED模式多维度健康干预对老年人血脂异常BMI及不良生活方式的干预效果好,能有效制止患者的不良生活方式,改善患者BMI,值得推广。展开更多
基金Projects(50475029,50605015) supported by the National Natural Science Foundation of China
文摘Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angularextrusion(ECAE) in semi-solid isothermal treatment was investigated. The results show that withincreasing semi-solid isothermal treatment temperature, the a phase solid grain size of processedMg-Al-Zn alloy by ECAE increases firstly due to coarsening of a phase solid grains, then decreasesdue to melting of a phase solid grains. With the increase of extrusion passes during ECAE, the aphase solid grain size in the following semi-solid isothermal treatment decreases. The a phase solidgrain size of processed Mg-Al-Zn alloy by ECAE under route B_C is the smallest, while the a phasesolid grain size of processed material by ECAE under route A is the largest. The primary mechanismof spheroid formation depends on the melting of recrystallizing boundaries and diffusion of soluteatoms in the semi-solid state.
文摘In recent years, there has been mounting interest i n measuring process performance in manufacturing industry. Based on analyzing the process capability indices, a production department can trace and improve a poor process to enhance quality levels and satisfy customers. The process capabilit y analysis can also serve as an important reference for making decisions for imp roving the global quality of all products. Since C p and C pk are failed to account for process centering, the index C pm is developed. The index C pm takes the process centering into consideration and is su itable for the processes with nominal-the-best type. There are other indices l ike C pu and C pl, and those indices are used for unilateral s pecification processes. Chou (1994) developed a procedure using estimators of C p, C pu and C pl for practitioners to determine whether two p rocesses are equal capability or not. For bilateral specifications processes, i ndex C p is failed to measure process yield and process centering. Thus, th e index C pm is used to develop a similar procedure for practitioners t o determine whether two processes are equal capability or not. The decisions mad e using the procedure to select the better supplier are, of course, more reliabl e.
文摘As one of the major projects of GAME (GEWEX Asian Monsoon Experiment), the GAME\|Tibet aimed to mainly examine the energy and water cycle in Tibetan Plateau and its effects on Asian monsoon. In this paper, based on the in\|situ high\|resolution observation data of GAME\|Tibet, the soil energy\|moisture distribution and the melting\|freezing progresses and their effects on seasonal shift were preliminarily discussed.The soil energy\|water distribution and freezing\|melting processes varied at different sites in northern part of Tibetan Plateau. The temporal and spatial variation of the soil moisture content is more complex than that of temperature. The soil moisture content increased with depth in certain layers but decreased in other layers. The freezing and melting processes and the temperature distribution were largely influenced by the existence of higher soil moisture content layer. During summer monsoon, the soil moisture at 10cm at all sites is relatively high, but the spatial difference existed. Generally speaking, the shallow layers start to freeze in October and to melt from April at all sites, with about 6 months frozen period. However, the beginning time of freezing\|melting and frozen period varied at different sites.
文摘Bio-sensor arrays for multi-channel recording have been developed recently and signal processing platforms for those signals have been studied actively.But it’s thereal situation which these technologies are generally developed and studied respectively.So the interface design between recording array and signal processing platform is also an important issue to make bio-sensor signal processing system.In this paper,we proposed interface which has unique protocols to control sensor array and operate platform.There are two types of protocols in the interface.One is between sensor array and MCU in platform and the other is between MCU and board for wireless communication.Basically,each protocol has two kinds of modes(single,frame)and it can be extended if needed.
文摘The recognition of surgical processes in the operating room is an emerging research field in medical engineering. We present the design and implementation of a instrument localization system that is based on information fusion strategies to enhance its recognition power. The system was implemented using RFID technology. It monitored the presence of surgical tools in the interventional site and the instrument tray and combined the measured information by applying redundant, complementary, and cooperative information fusion strategy to achieve a more comprehensive model of the current situation. An evaluation study was performed that showed a correct classification rate of 97% for the system.
文摘目的:探讨健康教育与健康促进(PRECEDE-PROCEED)模式多维度健康干预对血脂异常老年人的应用效果。方法:选择2020年5月至2021年5月中南大学湘雅医学院附属海口医院体检中心检查出存在血脂异常的110名老年患者,按照随机数表法分成对照组与研究组,每组55例。对照组采用常规干预措施,研究组采用PRECEDE-PROCEED模式多维度健康干预措施。对比分析2组干预前及干预3个月后的血脂水平[总胆固醇(total cholesterol,TC)、三酰甘油(triglyceride,TG)、高密度脂蛋白(high-density lipoprotein,HDL)、低密度脂蛋白(low-density lipoprotein,LDL)]、体重指数(body mass index,BMI)、不良生活方式发生率及生活质量评分,并评估2组患者干预效果。结果:干预后,2组TC、TG、HDL、LDL均较干预前明显降低,且研究组明显低于对照组,差异有统计学意义(P<0.05);干预后,2组BMI中肥胖、超重、偏瘦的发生率均较干预前降低,且研究组明显低于对照组,差异有统计学意义(P<0.05);干预后,2组BMI正常的占比均较干预前升高,且研究组明显高于对照组,差异有统计学意义(P<0.05);干预后,2组不良生活方式中吸烟、饮酒、饮食不均衡、运动不达标的发生率均较干预前降低,且研究组明显低于对照组,差异有统计学意义(P<0.05);干预后,2组简明健康调查量表(36-items Short Form Health Survey,SF-36)中的躯体功能、生理功能、情绪功能、社会功能评分均较干预前明显升高,且研究组明显高于对照组,差异均有统计学意义(P<0.05);研究组干预总有效率明显高于对照组,差异有统计学意义(P<0.05)。结论:PRECEDE-PROCEED模式多维度健康干预对老年人血脂异常BMI及不良生活方式的干预效果好,能有效制止患者的不良生活方式,改善患者BMI,值得推广。
