The isothermal compression tests were carried out in the Thermecmastor-Z thermo-simulator at temperatures of 800, 850, 900, 950, 1000 and 1050 ℃ and the strain rates of 0.01, 0.1, 1 and 10 s-1. The influence of defor...The isothermal compression tests were carried out in the Thermecmastor-Z thermo-simulator at temperatures of 800, 850, 900, 950, 1000 and 1050 ℃ and the strain rates of 0.01, 0.1, 1 and 10 s-1. The influence of deformation temperature and strain rate on the flow stress of Ti-6Al-2Zr-IMo-IV alloy was studied. Based on the experimental data sets, the high temperature deformation behavior of Ti-6A1-2Zr-IMo-IV alloy was presented using the intelligent method of artificial neural network （ANN）. The results indicate that the predicted flow stress values by ANN model is quite consistent with the experimental results, which implies that the artificial neural network is an effective tool for studying the hot deformation behavior of the present alloy. In addition, the development of graphical user interface is implemented using Visual Basic programming language.展开更多
An isothermal compressive experiment using Gleeble 1500 thermal simulator was studied to acquire flow stress at different deformation temperatures, strains and strain rates. The artificial neural networks with the err...An isothermal compressive experiment using Gleeble 1500 thermal simulator was studied to acquire flow stress at different deformation temperatures, strains and strain rates. The artificial neural networks with the error back propagation(BP) algorithm was used to establish constitutive model of 2519 aluminum alloy based on the experiment data. The model results show that the systematical error is small(δ=3.3%) when the value of objective function is 0.2, the number of nodes in the hidden layer is 5 and the learning rate is 0.1. Flow stresses of the material under various thermodynamic conditions are predicted by the neural network model, and the predicted results correspond with the experimental results. A knowledge-based constitutive relation model is developed.展开更多
This paper mainly discusses leadership soft skills, which comprise of collaboration or teamwork, communication skills, initiative, leadership ability, people development or coaching, personal effectiveness or personal...This paper mainly discusses leadership soft skills, which comprise of collaboration or teamwork, communication skills, initiative, leadership ability, people development or coaching, personal effectiveness or personal mastery, planning and organizing, and presentation skills. Leaders need to be masters of soft skills because leadership is determined by those who can demonstrate their ability to drive an organization toward excellence and results. The aim of this paper is to contribute to the body of knowledge and literature in leadership soft skills for educational leaders in higher education institutions. In addition, this paper also provides exposure to administrators to understand the importance of leadership soft skills besides highlighting the two relevant models. Furthermore, it also provides an advantage to administrators in developing high quality interpersonal relationships with the people who they associate with in promoting positive working environment. Leadership soft skills can be seen as providing a vital contribution for organizations and administrators in the process of developing of quality human resource.展开更多
In this 21 st century, whether we like it or not, it is very clear that the Intemet, social media, and all ad of the related technology have come to stay. This new technological discovery has brought great and wonderf...In this 21 st century, whether we like it or not, it is very clear that the Intemet, social media, and all ad of the related technology have come to stay. This new technological discovery has brought great and wonderful benefits to our family＇s lives and relationships. However as it is always the case with any new innovations, it has its own negative side. This paper aims at investigating what actually social media is and how it translates to children, especially African children, as it relates to family and social living. Actually Internet provide benefits in areas such as cognitive and social development, it also presents risks together with opportunities for children＇s growth and development. It is common today to see children spending great quality of their time using other social websites. It is also evidenced that Interact provide benefits in the area of emotional and intellectual development and at the same time present risk as well as opportunities to children＇s development in functional and societal challenges. Therefore social media gives the children of the present age the opportunity to enter into global entertainment and communication. As a result of this development, there is now Internet addiction of children. Hence, there is serious need for parents to be aware of the nature of social media sites, their children are using. This is because not all of them are healthy environments for children. Experts such as childhood educators and psychologist even Paediatricians are equipped and so are better hands to assist parents not only to know and understand these websites but to encourage proper use and make them to monitor for potential problems such as cyber-bullying, facebook depression, exposure to inappropriate content and sexting. This paper proffers some recommendation that certainly will assist parents to bring up their children up to be vibrant adult even in this technological era.展开更多
基金Project (2007CB613807) supported by the National Basic Research Program of ChinaProject (35-TP-2009) supported by the Fund of the State Key Laboratory of Solidification Processing in NWPU,ChinaProject (51075333) supported by the National Natural Science Foundation of China
文摘The isothermal compression tests were carried out in the Thermecmastor-Z thermo-simulator at temperatures of 800, 850, 900, 950, 1000 and 1050 ℃ and the strain rates of 0.01, 0.1, 1 and 10 s-1. The influence of deformation temperature and strain rate on the flow stress of Ti-6Al-2Zr-IMo-IV alloy was studied. Based on the experimental data sets, the high temperature deformation behavior of Ti-6A1-2Zr-IMo-IV alloy was presented using the intelligent method of artificial neural network （ANN）. The results indicate that the predicted flow stress values by ANN model is quite consistent with the experimental results, which implies that the artificial neural network is an effective tool for studying the hot deformation behavior of the present alloy. In addition, the development of graphical user interface is implemented using Visual Basic programming language.
文摘An isothermal compressive experiment using Gleeble 1500 thermal simulator was studied to acquire flow stress at different deformation temperatures, strains and strain rates. The artificial neural networks with the error back propagation(BP) algorithm was used to establish constitutive model of 2519 aluminum alloy based on the experiment data. The model results show that the systematical error is small(δ=3.3%) when the value of objective function is 0.2, the number of nodes in the hidden layer is 5 and the learning rate is 0.1. Flow stresses of the material under various thermodynamic conditions are predicted by the neural network model, and the predicted results correspond with the experimental results. A knowledge-based constitutive relation model is developed.
文摘This paper mainly discusses leadership soft skills, which comprise of collaboration or teamwork, communication skills, initiative, leadership ability, people development or coaching, personal effectiveness or personal mastery, planning and organizing, and presentation skills. Leaders need to be masters of soft skills because leadership is determined by those who can demonstrate their ability to drive an organization toward excellence and results. The aim of this paper is to contribute to the body of knowledge and literature in leadership soft skills for educational leaders in higher education institutions. In addition, this paper also provides exposure to administrators to understand the importance of leadership soft skills besides highlighting the two relevant models. Furthermore, it also provides an advantage to administrators in developing high quality interpersonal relationships with the people who they associate with in promoting positive working environment. Leadership soft skills can be seen as providing a vital contribution for organizations and administrators in the process of developing of quality human resource.
文摘In this 21 st century, whether we like it or not, it is very clear that the Intemet, social media, and all ad of the related technology have come to stay. This new technological discovery has brought great and wonderful benefits to our family＇s lives and relationships. However as it is always the case with any new innovations, it has its own negative side. This paper aims at investigating what actually social media is and how it translates to children, especially African children, as it relates to family and social living. Actually Internet provide benefits in areas such as cognitive and social development, it also presents risks together with opportunities for children＇s growth and development. It is common today to see children spending great quality of their time using other social websites. It is also evidenced that Interact provide benefits in the area of emotional and intellectual development and at the same time present risk as well as opportunities to children＇s development in functional and societal challenges. Therefore social media gives the children of the present age the opportunity to enter into global entertainment and communication. As a result of this development, there is now Internet addiction of children. Hence, there is serious need for parents to be aware of the nature of social media sites, their children are using. This is because not all of them are healthy environments for children. Experts such as childhood educators and psychologist even Paediatricians are equipped and so are better hands to assist parents not only to know and understand these websites but to encourage proper use and make them to monitor for potential problems such as cyber-bullying, facebook depression, exposure to inappropriate content and sexting. This paper proffers some recommendation that certainly will assist parents to bring up their children up to be vibrant adult even in this technological era.
