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Aniruddha Dutta's Projects

electron-microscopy-simulations icon electron-microscopy-simulations

This program was developed to determine the intensity of a electron beam on a HAADF detector when the electron beam passes through a wedge shaped material (1nm - 3 microns). The thickness ranges from one nm to few microns. The program calculates elastic scattering from an electron beam per nm of the sample and also the absorption using scattering coefficients, density, atomic number, absorption parameters and HAADF scattering angle and detector parameters. The program takes into account Fresnel propagator and uses fast fourier transform along with centered distribution intensity. This program was named Modified Multi Slice simulation . @Aniruddha Dutta, 2014

electron-microscopy-simulations-ii icon electron-microscopy-simulations-ii

This program studies the behavior of electrons when an electron beam is scanned across the interface of two materials (one with high, other with low density). The example over here is with Au and Al. This program calculates the HAADF detector intensity, fraction of electrons absorbed in both the elements and the total scattering. This explains atomic number contrast across interfaces. This program has also been tested for multiple interfaces and with compounds like SiO2-W-SiO2. The program employs absorption and scattering probabilities at every thickness step. The path of each electron is tracked as the electron passes through the sample suffering multiple scattering events. The tracking is done both in real space as well as in momentum space. The real space position of the electron is recorded to track the position of the electron near the interface and to determine if it is in the low or high density material. This is important as different scattering probabilities are used for both materials. The program also tracks the angle at which the electron traverses the materials. This corresponds to the x-y components of the electrons momentum vector and to the scattering angle of electrons in the diffraction plane.

trading_momentum icon trading_momentum

This research explores a momentum trading style calculating the top n highest returns

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