Beginning with the general Bjorken-Mtingwa solution, we derive a simplified model of intrabeam scattering (IBS), one valid for high energy beams in normal storage rings; our result is similar, though more accurate than a model due to Raubenheimer. In addition, we show that a modified version of Piwinski’s IBS formulation (where η x,y/βx,y has been replaced by Hx,y) at high energies asymptotical...

Model Driven Engineering (MDE) is a model-centric software development approach aims at improving the quality and productivity of software development processes. While some progresses in MDE have been made, there are still many challenges in realizing the full benefits of model driven engineering. These challenges include incompleteness in existing modeling notations, inadequate in tools suppor...

The growth of streamer trees in insulating fluids ~a submicrosecond process that triggers high-voltage breakdown! has been simulated with a combination of parallel-coding tools. Large grids and arrays display well the multifractal, self-avoiding character of the streamer trees. Three physical cases have been approximated by different power-law weightings of the statistical growth filter: dense ...

To estimate the consequences of radionuclide spread during nuclear power plant accidents, atmospheric dispersion simulation models such as Gaussian Plume Model, Lagrangian Trajectory Model are widely used. However, they require a complex set of meteorological data. Yet, the historical data is not consistently available because of the lack of observed meteorological indicators in some situations...

Some types of biomass stoves, such as charcoal stoves, tend to be difficult to light due to poor initial draft and sensitivity to ambient wind. Decreasing the time necessary to light such stoves could increase user acceptance and convenience and decrease the user’s exposure to harmful emissions, as ignition is one of the smokiest portions of a cooking fire and may require close tending attentio...

background: high-energy linear accelerator (linac) is a valuable tool and the most commonly device for external beam radiation treatments in cancer patients. in the linac head, high-energy photons with energies above the threshold of interaction produce photoneutrons. these photoneutrons deliver the extra dose to the patients in the planning treatment and increase the risk of secondary cancer. ...

muskingum-cunge is one of the widely employed methods for flood routing. direct calibration of the model based on previous flood events is not required and the routing parameters in this method are determined according to physical characteristics and hydraulic conditions of the stream. during the last decade, different modifications were proposed for the method to increase its accuracy. in this...

A frequency domain dynamic analysis is needed to obtain the response of structures constructed on a system of base isolators on flexible soil when subjected to earthquake ground motion. In such systems, the lateral stiffness of the base isolators is so small, compared to the structural stiffness, that in an earthquake attack the fundamental vibration mode dominates the response. With this in mi...