Sharif Digital Repository

First stage blades tempreture in the turbine rotor section for the advanced turbines has increased up to 1100oc. The blades should be under mentioned condition for the long times up to 70000 hours and accordingly creep happens. Fatigue–creep interaction is the main reason for the failures of many engineering components under high temperature and cyclic loading. In this thesis, a model for the life prediction of fatigue–creep interaction which was developed by other investigators has been modified to predict fatigue–creep interaction on the nickel-based superalloys. In this model, the law of energy conservation and the momentum conservation principle are used to describe the process of... 

Feyerabend was a philosopher of science that became famous for his purportedly anarchistic view of science and his rejection of the existence of universal methodological rules and rationality of science. Feyerabend’s view of science can be summarize in a few points; 1. On the issue of falsifiability, Feyerabend argues that no theory is ever consistent with all the relevant facts. He sees the use of ad-hoc postulates to save the dominant paradigm as an essential to the progress of science. He claims that scientists frequently depart completely from the scientific method when they use ad-hoc ideas to explain observations that are only later justified by theory. To Feyerabend, ad-hoc... 

Nowadays, separate use of traditional service management frameworks and approaches will not meet the needs of businesses and customers. This is because of the very fast change in the environment and the move to the digital age. The integration of traditional approaches into modern ones significantly helps organizations adapt to new needs and changes in the environment. In this research, first, the basic concepts of the ITIL framework as the most widely used IT services management framework have been studied. Then, the COBIT framework as the most accepted IT governance framework has been investigated. The VeriSM approach also has been used as a solution for service management in the digital... 

Nowadays, separate use of traditional service management frameworks and approaches will not meet the needs of businesses and customers. This is because of the very fast change in the environment and the move to the digital age. The integration of traditional approaches into modern ones significantly helps organizations adapt to new needs and changes in the environment. In this research, first, the basic concepts of the ITIL framework as the most widely used IT services management framework have been studied. Then, the COBIT framework as the most accepted IT governance framework has been investigated. The VeriSM approach also has been used as a solution for service management in the digital... 

Microelectromechanical sensors are small and sensitive devices that can measure physical quantities such as pressure, temperature, speed, and acceleration. Some of these sensors, which include accelerometers and gyroscopes, are used in small navigation systems. These sensors are highly sensitive and influenced by their surrounding environment, which may malfunction under the influence of some environmental factors; In such a way that the data output from them is accompanied by a significant error. One of the factors causing malfunction of the sensor is the high frequency fluctuations of the environment. In practice, it is not possible to completely eliminate these fluctuations. A logical and...