Essays about: "perturbation effects"

Showing result 1 - 5 of 28 essays containing the words perturbation effects.

1. 1. Total Monte Carlo of the fission model in GEF and its influence on the nuclear evaporation in TALYS

   University essay from Uppsala universitet/Tillämpad kärnfysik

   Author : Karlsson Peter; [2023]
   Keywords : physics; nuclear physics; fission; neutron-induced; evaporation; Hauser-Feshbach; GEF; TALYS; Total Monte Carlo; TMC; fysik; kärnfysik; neutron-inducerad;

   Abstract : Features recently added to the nuclear reaction software TALYS allow the use of the GEF model as a fission fragment generator. GEF generates data for fission fragment yields, total excitation energy (TXE), total kinetic energy (TKE) and individual fragment excitation energies (E*) with their standard deviations through Monte Carlo simulations for TALYS. READ MORE

3. 2. Characterization and Stabilization of Transverse Spatial Modes of Light in Few-Mode Optical Fibers

   University essay from Linköpings universitet/Informationskodning

   Author : Oscar Pihl; [2023]
   Keywords : spatial modes; Space division multiplexing; SDM; superpositions; LP-modes; few-mode fibers; quantum communication; quantum optics; adaptive optics; stochastic parallel gradient descent; SPGD; mode control; QKD; polarization controller; paddle controller; QRNG; quantum random number generator; spatial modes; perturbation effects;

   Abstract : With the growing need for secure and high-capacity communications, innovative solutions are needed to meet the demands of tomorrow. One such innovation is to make use of the still unutilized spatial dimension of light in communications, which has promising applications in both enabling higher data traffic as well as the security protocols of the future in quantum communications. READ MORE

4. 3. Beyond the Gross-Pitaevskii Equation: A Perturbative Approach

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Teknisk fysik (CI)

   Author : Anton Johansson; [2023]
   Keywords : Gross-Pitaevskii; Beyond mean-field; Many-body Perturbation Theory; Bose-Einstein Condensate; BEC; Physics and Astronomy;

   Abstract : We propose and implement a beyond Gross-Pitaevskii approach based on Many-Body Perturbation theory (MBPT) for the study of Bose-Einstein Condensate (BECs) ground states. Two partitions of the system Hamiltonian are considered. READ MORE

5. 4. The effect of imperfect resource conversion and recurring perturbations on byproduct cross- feeding chains in digital communities

   University essay from Linköpings universitet/Institutionen för fysik, kemi och biologi

   Author : Filippa Frejborg; [2021]
   Keywords : byproduct cross-feeding; cross-feeding interactions; digital evolution; digital organisms; gut microbiome; recurring perturbations; resource conversion;

   Abstract : The gut microbiome plays a vital role in human health. Disturbances of this microbial system is associated with diseases such as obesity and inflammatory bowel disease. In populations of microbial species, many organisms partake in byproduct cross-feeding interactions, where byproducts from one organism are consumed by other microbes. READ MORE

6. 5. Beyond Mean-Field Description of Bose-Einstein Condensate

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Daniel Larsson Persson; [2021]
   Keywords : Bose-Einstein condensate; BEC; dilute; non-uniform; quantum depletion; second quantisation; mean field; mean-field approximation; the Gross-Pitaevskii equation; Gross-Pitaevskii; perturbation theory; many-body perturbation theory; Rayleigh-Schrödinger perturbation theory; Rayleigh-Schrödinger; Epstein-Nesbet perturbation theory; Epstein-Nesbet; quantum ring; Physics and Astronomy;

   Abstract : This thesis work is on the theoretical description of dilute Bose-Einstein condensates (BEC) that are non-uniform, meaning that more than one single-particle state is occupied. This phenomenon is usually called quantum depletion. READ MORE