wear is a complicated phenomenon caused by the relative movement of two contacting surfaces compressed together by a normal force. prediction of the wear, in most cases, requires various experiments and microstructural characterization of the contacting surfaces. mathematical models based on physical concepts could provide considerable help in understanding the physical behavior and hence the p...

We study the impulsive responses of a grounded linear oscillator coupled to a light nonlinear attachment through an essentially nonlinear (nonlinearizable) stiffness. We analyze the periodic and quasi-periodic dynamics of the undamped system forced by a single impulse on the linear oscillator and being initially at rest, by considering separately low-, moderateand high-energy impulsive motions....

Auger electrons and characteristic X-rays, collectively named as atomic radiation, are emitted following atomic ionization. Radioisotopes that emit Auger electrons have been of particular interest as therapeutic agents. This is primarily due to its short range in tissue, controlled linear paths and high linear energy transfer of these particles. Their biological effect is very localised thus ma...

In order to identify the dimensions and indices of the phenomenon of “leading transfer of learning” within the secondary schools of Tehran province, a sample of 17 lecturers, principals, and experienced teachers was targeted and then interviewed. Inductive analyses of the collected data at three levels of open, pivotal, and selective coding indicate that the role of high school principals along...

Although the implementation of targeted energy subsidies plan has been considered by policymakers since the First 5-year Economic, Social and Cultural Development Plan in Iran, it is only partially implemented in 2010. This issue has great importance for industry sector that has benefited from subsidized energy prices. This research attempts to investigate the possible impact of implementing Su...