background: the monte carlo method is the most accurate method for simulation of radiation therapy equipment. the linear accelerators are currently the most widely used machines in radiation therapy centers. methods: in this work, a monte carlo modelling of the siemens oncor linear accelerator in 6 mv and 18 mv beams was performed. the results of simulation were validated by measurements in wat...

Context. We have presented a numerical model for the non-thermal emission of gamma-ray binaries in pulsar-wind driven scenario. Aims. apply this to one best-observed binaries, LS 5039 system. Methods. The involves joint simulation pulsar- and stellar-wind interaction transport electronic pairs from pulsar wind accelerated at emerging shock structure. compute synchrotron inverse Compton post-pro...

Blazars, a class of highly variable active galactic nuclei, sometimes exhibit Orphan γ-ray flares. These flares having high flux only in energies do not show significant variations at lower energies. We study the temporal and spectral profile these detail from three γ−ray bright blazars, 3C 273, PKS 1510-089 279 also their simultaneous broadband emissions. find that variability timescales were ...

Modelling of the point spread function of the UKIRT IRCAM3 array was conducted in order to test for any extended emission around the X-ray binary Cyg X-3. We found that the point spread function cannot be represented by a simple Gaussian, but modelling of the stars required additional functions, namely Lorentzian and exponential components. After modelling for the PSF, we found that Cyg X-3 cou...

In this paper, the accuracy of non-linear finite element computations in application to surgical simulation was evaluated by comparing the experiment and modelling of indentation of the human brain phantom. The evaluation was realised by comparing forces acting on the indenter and the deformation of the brain phantom. The deformation of the brain phantom was measured by tracking 3D motions of X...