The liquid phase behavior of the fine-grained 5083 AI alloy obtained through thermomechanical process was investigated during the tensile tests in a temperature range of 380-570℃ and strain rate range of 4.17× 1...The liquid phase behavior of the fine-grained 5083 AI alloy obtained through thermomechanical process was investigated during the tensile tests in a temperature range of 380-570℃ and strain rate range of 4.17× 10^-4- 1.0× 10^-2 s^-1. The maximum elongation 530% of the fine-grained 5083 AI alloy was obtained at 550℃ and 4.17× 10^-4 s^-1. Fracture analysis by scanning electron microscopy （SEM） indicated that the formation of filament （formed by liquid phase） was greatly affected by the tensile temperature and strain rate. The results also showed that the optimum morphology of formed filament was obtained at 550℃ and a strain rate of 4.17× 10^-4 s^-1. The effect of liquid phase on superplastic deformation of the alloy was further discussed.展开更多
Although the agriculture in Heilongjiang Province has develope poor historical basis and differences between rural and urban institutional fa d ct effectively in recent years, due to issues such as ors, the backward o...Although the agriculture in Heilongjiang Province has develope poor historical basis and differences between rural and urban institutional fa d ct effectively in recent years, due to issues such as ors, the backward of the agricultural fundamental infrastructure is always the major obstacle in rural economic development of Heilongjiang Province, which prevents the advantage of agricultural production from being fully developed, leading to the increase rate of the grain yield to grow slowly. The backward reflects in the following aspects, the serious aging of water facilities, insufficient agricultural machinery and equipment, low leve of rural roads, lacking of research equipment, shortage of ecological protection facilities, and so on. Based on the latcr data of Heilongjiang Province, this paper analyzed the connection between agricultural fundamental infrastructure and grain yield by using the gray connected model, differentiated primary rural fundamental infrastructure from the secondary one, and provided some suggestions to develop rural areas展开更多
制造活动的发展已从原始的手工制造发展成为机器制造(单机)、流水线制造进而进入了柔性制造系统时期并开始向高度自动化的未来工厂发展。自动制造系统是一个典型的分级递阶的智能控制系统。我们可以从系统的功能或从管理学的角度对系统...制造活动的发展已从原始的手工制造发展成为机器制造(单机)、流水线制造进而进入了柔性制造系统时期并开始向高度自动化的未来工厂发展。自动制造系统是一个典型的分级递阶的智能控制系统。我们可以从系统的功能或从管理学的角度对系统进行不同的划分。Pun和Dougmeingts把系统划分为物理系统、信息系统与决策系统。Pun据此提出了GRAI(Graphs with Results and Activities Interrelated,结果与活动相关的图)。GRAI是适合于对制造系统进行管理、决策控制的概念模型方法。它已被ESPRIT—CIM小组采纳,并在许多国家的小型系统中应用并取得成功。 事实上,决策与控制是有相差别的一面的。我们可以把自动制造系统划分为决策系统、控制系统、信息系统与物理系统(如图1所示)。展开更多
文摘The liquid phase behavior of the fine-grained 5083 AI alloy obtained through thermomechanical process was investigated during the tensile tests in a temperature range of 380-570℃ and strain rate range of 4.17× 10^-4- 1.0× 10^-2 s^-1. The maximum elongation 530% of the fine-grained 5083 AI alloy was obtained at 550℃ and 4.17× 10^-4 s^-1. Fracture analysis by scanning electron microscopy （SEM） indicated that the formation of filament （formed by liquid phase） was greatly affected by the tensile temperature and strain rate. The results also showed that the optimum morphology of formed filament was obtained at 550℃ and a strain rate of 4.17× 10^-4 s^-1. The effect of liquid phase on superplastic deformation of the alloy was further discussed.
文摘Although the agriculture in Heilongjiang Province has develope poor historical basis and differences between rural and urban institutional fa d ct effectively in recent years, due to issues such as ors, the backward of the agricultural fundamental infrastructure is always the major obstacle in rural economic development of Heilongjiang Province, which prevents the advantage of agricultural production from being fully developed, leading to the increase rate of the grain yield to grow slowly. The backward reflects in the following aspects, the serious aging of water facilities, insufficient agricultural machinery and equipment, low leve of rural roads, lacking of research equipment, shortage of ecological protection facilities, and so on. Based on the latcr data of Heilongjiang Province, this paper analyzed the connection between agricultural fundamental infrastructure and grain yield by using the gray connected model, differentiated primary rural fundamental infrastructure from the secondary one, and provided some suggestions to develop rural areas
文摘制造活动的发展已从原始的手工制造发展成为机器制造(单机)、流水线制造进而进入了柔性制造系统时期并开始向高度自动化的未来工厂发展。自动制造系统是一个典型的分级递阶的智能控制系统。我们可以从系统的功能或从管理学的角度对系统进行不同的划分。Pun和Dougmeingts把系统划分为物理系统、信息系统与决策系统。Pun据此提出了GRAI(Graphs with Results and Activities Interrelated,结果与活动相关的图)。GRAI是适合于对制造系统进行管理、决策控制的概念模型方法。它已被ESPRIT—CIM小组采纳,并在许多国家的小型系统中应用并取得成功。 事实上,决策与控制是有相差别的一面的。我们可以把自动制造系统划分为决策系统、控制系统、信息系统与物理系统(如图1所示)。
