Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Physics, Astrophysics"”.
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Doppler shifts in the KATRIN experiment
… particles by the Standard Model of Particle Physics, have been shown to have non-zero mass. The absolute scale of this neutrino mass has significant implications in particle physics, astrophysics, and cosmology. The KATRIN experiment is designed to measure this absolute scale by examining the …
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TIME RESOLVED PROBING OF MAGNETO-ELASTIC EXCITATIONS IN MAGNETIC MATERIALS
… as a doctoral student of the Ph.D. School in Physics, Astrophysics and Applied Physics at Universita degli Studi di Milano, that has been carried out since November 2020 at Istituto Officina dei Materiali of Consiglio Nazionale delle Ricerche (IOM-CNR) and within the framework of Nanoscale …
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Measurement of the double beta decay half-life of ^{100}Mo to the 0^{+}_{1} excited state, and ^{48}Ca to the ground state in the NEMO 3 experiment
… have huge implications for not only particle physics, but also nuclear physics, astrophysics and cosmology. The study of two-neutrino double beta decay gives us a better understanding of the nuclear models used to calculate the nuclear matrix elements, which are so important in extracting new …
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TIME-DOMAIN INVESTIGATION OF ACOUSTICALLY AND THERMALLY DRIVEN MAGNONS
… carried out as Ph.D. student of the School in Physics, Astrophysics and Applied Physics at Università degli Studi di Milano, which was performed from October 2021 at the Istituto Officina dei Materiali of Consiglio Nazionale delle Ricerche (CNR-IOM) within the Nanoscale Foundries and Fine …
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MONITORING PHONON DYNAMICS IN QUANTUM MATERIALS BY TIME-RESOLVED SPONTANEOUS RAMAN SCATTERING
… work as doctoral student of the Ph.D. School in Physics, Astrophysics and Applied Physics at Università degli Studi di Milano, that has been carried out since October 2022 at the Istituto Officina dei Materiali of the Consiglio Nazionale delle Ricerche (IOM-CNR) and within the framework of …
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X-ray Radiative Signatures Influenced by Nonthermal Effects in High-Energy-Density Laboratory Plasmas of Mid-Atomic-Number Z-pinches
… environments with broad application to atomic physics, astrophysics, and HED laboratory physics, including inertial confinement fusion (ICF), making it an inimitable tool for interdisciplinary science. Spectroscopic examination of plasma radiation can yield robust information on plasma …
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New Approaches to Map-Making for Cosmic Microwave Background Observations
… pipeline. From the standpoint of Extragalactic Astrophysics, point source data from the WMAP instrument can provide important information about source variability on a range of different time scales. I establish a program to search the public time-ordered WMAP datasets for under-exploited …
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Local Numerical Models of Turbulent Accretion Flows
Magnetohydrodynamical (MHD) turbulence induced by magnetorotational instability (MRI) is the most promising candidate for driving angular momentum transport in accretion disks. This work provides a comprehensive study of MHD turbulent accretion flow using shearing box simulations.
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The Origins and Environments of Quasar Absorption Lines in the Sloan Digital Sky Survey
Owing to the advent of large spectroscopic surveys such as the Sloan Digital Sky Survey (SDSS), tens of thousands of quasar absorption line (QAL) systems have been identified to date. QAL catalogs currently extend to z ∼ 4.6 and provide unique probes of the large scale structure of baryonic …
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Coupling Down Converted Light Into Single Mode Fibers
We investigate the influence of the pump and collection mode parameters on the collection efficiency of Type I down converted photons into single mode fibers. For best single and coincidence counting rates, we find that the mode sizes should be close to the same size and that the mode waists should …
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Early Dynamics of Ultracold Neutral Plasmas
We report new studies on the early-time dynamics of ultracold neutral plasmas. We use fluorescence spectroscopy to probe plasma dynamics on the nanosecond time scale. We determine the rms ion velocity during the initial plasma period. The initial ion acceleration is found as the time derivative of …
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Transport Properties and Radiation Production in Plasmas with Sub-Larmor-Scale Magnetic Turbulence
Kinetic streaming instabilities, such as the Weibel instability, occur in various HED plasma setups. Such instabilities generate strong (sub-equipartition) magnetic fields which reside at small, sub-Larmor scales. Efficient electron acceleration to relativistic energies is not uncommon in such …
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Neutron exposure and neutron flux in Asymptotic Giant Branch stars: a study of neutron capture cross sections of Zr isotopes
Nuclear astrophysics is an interdisciplinary branch of physics involving close collaboration among researchers in various subfields of nuclear physics and astrophysics, with significant emphasis in areas such as stellar modeling, measurement and theoretical estimation of nuclear reaction rates, …
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Space- and ground-based observations of pulsating aurora
<p>Pulsating aurora is a frequently occurring phenomenon generally believed to occur mainly in the aftermath of a substorm, resulting in widespread auroral luminosity corresponding to a significant transfer of power from the magnetosphere to the ionosphere. A handful of theories have been proposed …
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Novel Neutron Detector for n-n Scattering Length Measurement
… length is a fundamental parameter in nuclear physics; however, measurements are plagued with large uncertainties caused by neutron detector cross talk. Many experimentalists also rely upon computer code to calibrate their neutron detectors. Experiments give one of two different numbers but …
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Results from the QUIET Q-Band Observing Season
The Q/U Imaging ExperimenT (QUIET) is a ground-based telescope located in the high Atacama Desert in Chile, and is designed to measure the polarization of the Cosmic Microwave Background (CMB) in the Q and W frequency bands (43 and 95 GHz respectively) using coherent polarimeters. From 2008 October …
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High Lundquist Number Simulations of Parker's Model of Coronal Heating: Scaling and Current Sheet Statistics Using Heterogeneous Computing Architectures
<p>Parker's model [Parker, Astrophys. J., 174, 499 (1972)] is one of the most discussed mechanisms for coronal heating and has generated much debate. We have recently obtained new scaling results for a 2D version of this problem suggesting that the heating rate becomes independent of resistivity in …
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NEW GRAVITATIONAL INTERACTIONS IN COSMOLOGY —- FROM EFFECTIVE FIELD THEORY TO OBSERVATION
… to the ongoing dialogue between gravitational physics and cosmology.
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Design And Development Of An Autonomous Radar Receiver For The Detection Of Ultra High Energy Cosmic Rays
The detection of ultra-high energy cosmic rays is constrained by their flux, requiring detectors with apertures of hundreds or even thousands of square kilometers and close to one hundred percent duty cycle. The sheer scale that would be required of conventional detectors, to acquire sufficient …
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