Essays about: "Physics and Astronomy"

Showing result 1 - 5 of 1253 essays containing the words Physics and Astronomy.

1. 1. Prototyping of an automated cyclic Neutron Activation Analysis setup

   University essay from Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

   Author : Cornelius Maurer; [2022]
   Keywords : Nuclear Physics; Neutron activation analysis; cyclic-NAA; Physics and Astronomy;

   Abstract : A prototype Neutron Activation Analysis (NAA) setup based on a Deuterium-Tritium (DT) neutron generator is under development at Lund University. It serves as proof-of-principle for NAA based on a Compact Accelerator-driven Neutron Source. READ MORE

3. 2. Quantum state tomography of attosecond electron wavepackets

   University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Author : Ron Demjaha; [2022]
   Keywords : quantum physics; quantum state tomography; atomic physics; quantum optics; density matrix; entanglement; state mixing; fano resonances; two-photon absorption; Physics and Astronomy;

   Abstract : In this master thesis, a broad theoretical description is done of a novel quantum state tomography protocol called KRAKEN. This protocol is meant for the determination of the density matrix of an electronic state created by absorption of XUV radiation in the vicinity of a Fano resonance. At first, a description of the KRAKEN protocol is provided. READ MORE

4. 3. Determination of Proton Beam Waist Positions Using Beam Position Monitors

   University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/European Spallation Source ESS AB; Lunds universitet/Synkrotronljusfysik

   Author : Gustav Gird Fahlström; [2022]
   Keywords : ESS; European Spallation Source; Proton beam; waist; BPM; Method; transverse; beam dynamics; beam physics; Lattice Error; Matrix formalism; Python; trajectory simulation; physics; Physics and Astronomy;

   Abstract : In this work, we examine a novel method for the determination of proton beam waist locations using beam position monitors. Based on the lattice of the final transport line section of the European Spallation Source linac, a simplified version of the beam line composed of quadrupole magnets and correctors is constructed in Python using a matrix formalism. READ MORE

5. 4. Investigating Relations between Regularization and Weight Initialization in Artificial Neural Networks

   University essay from Lunds universitet/Beräkningsbiologi och biologisk fysik

   Author : Rasmus Sjöö; [2022]
   Keywords : Artificial Neural Networks; L1 Regularization; L2 Regularization; Loss Function; Maximum Likelihood; Regularization Strength Synthetic Data Generation; Weight Initialization; Physics and Astronomy;

   Abstract : L2 regularization is a common method used to prevent overtraining in artificial neural networks. However, an issue with this method is that the regularization strength has to be properly adjusted for it to work as intended. This value is usually found by trial and error which can take some time, especially for larger networks. READ MORE

6. 5. Forward-Backward Multiplicity Correlations for Proton-Proton Collisions with ALICE at LHC-CERN

   University essay from Lunds universitet/Partikelfysik; Lunds universitet/Fysiska institutionen

   Author : August Koppers; [2022]
   Keywords : ALICE; Particle physics; CERN; LHC; QCD; pp collisions; Lund string model; Two particle correlation; Physics and Astronomy;

   Abstract : This thesis presents the study of two-particle pseudorapidity correlations in pp-collisions at √s = 13 TeV using the ALICE detector at LHC, CERN. The correlation function was calculated as a function of multiplicity and was repeated for several multiplicity classes and different charge combinations in the forward-backward and central regions of the detector, respectively. READ MORE