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.
Results
Showing 1 to 14 of 14 for “"small-scale structure"”.
-
Lorentz-violating dark matter
… standard simulations of the evolution of cosmic structure and observations. Simulations predict excessive structure formation on small scales, including density cusps at the centers of galaxies, that is not observed. This conflict still persists in early 2007, and it has not yet been convincingly …
-
ΜΕΛΕΤΗ ΤΗΣ ΣΕΙΣΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΚΑΤΑΣΚΕΥΩΝ Ο.Σ. ΣΕ ΜΟΡΦΗ ΟΜΟΙΩΜΑΤΩΝ ΥΠΟ ΚΛΙΜΑΚΑ ΚΑΘΩΣ ΚΑΙ ΣΕ ΠΡΩΤΟΤΥΠΟ ΜΕΓΕΘΟΣ ΜΕ ΤΥΠΟΠΟΙΗΜΕΝΗ ΜΟΡΦΗ
A TWO STORY R/C FRAME STRUCTURE UNDER GEOMETRIC SCALE 1:7,32 WAS TESTED UNDER SIMULATED EARTHQUAKE GROUND MOTIONS, USING THE EARTHQUAKE SIMULATOR FACILITY OF THE ARISTOTLE UNIVERSITY OF THESSALONIKI. CORRELATIONS WERE MADE BETWEEN THE EXPERIMENTAL RESULTS FROM THE PRESENT STUDY AND THOSE OBTAINED …
-
Manifold joins and jump conditions in general relativity
… as its aim the analysis of a possible manifold structure on V, a join of two individual manifolds V⁺ and V⁻, and analysing the physics across the join, as implied by Einstein's theory of General Relativity. There are several reasons why one might want to study such a situation. Firstly, the …
-
The sum of the 1D magnifications along the axis of positive curvature for a smooth gravitational potential with N point perturbations
… tend to give us information about the overall structure of a lensing galaxy, whereas the magnifications of the images tell us about small scale structure of the galaxy such as the abundance of stars and dark matter condensations. In particular, flux ratio anomalies- disparities between …
-
Data processing in nanoscale profilometry
New developments on the nanoscale are taking place rapidly in many fields. Instrumentation used to measure and understand the geometry and property of the small scale structure is therefore essential. One of the most promising devices to head the measurement science into the nanoscale is the …
-
Cosmic string cusps and their application to fast radio bursts
… the normally assumed power, rate, and time scale of any radiation bursts. The second is consideration of wiggly cosmic strings. Simulations imply a distribution of strings in an expanding universe develop small-scale structure called wiggles. We extend on a wiggly Polyakov formalism and show …
-
Scalable parallel simulation of small-scale structures in cold dark matter
… range forces. We apply our codes to simulate small scale structure of the universe at redshift z > 50. We observe and analyze the formation of caustics in the structure and compare it with the predictions of semi-analytic models of structure formation. The current limits on neutralino …
-
Probing the Intergalactic Medium with high-redshift quasars
… z ∼ 5−6 in Chapter 5. The biases are found to be small, and so the proximity effect is expected to give relatively unbiased estimates of Γ_bkg at z > 5, in contrast to lower redshifts. Photoionization heats the gas in the IGM, and so the thermal history of the IGM provides important constraints on …
-
Solar Wind-Magnetosphere Coupling: A Global Perspective of Reconnection in the Magnetotail
… observed by the Time History of Events and Macroscale Interactions During Substorms (THEMIS) spacecraft earthward of the reconnection site, which was determined to be approximately -33 RE. Ground signatures indicative of substorm activity were also observed by the THEMIS ground-based …
-
A size-based model of carbon and nitrogen flows in plankton communities
… and simulation results indicate that the small-scale structure of the two ecosystems and the processes occurring within them are relatively well understood. Consequently, the dynamic functioning of the two systems is investigated at the ecosystem level, using the simulation results. …
-
Auroral electrodynamics from simultaneous measurements at high and low altitudes
… of invariant latitude show that the large-scale features are essentially the same at high and low altitudes outside the auroral acceleration region. Parallel electric fields associated with parallel currents are such as to filter out the small-scale structure in the high-altitude electric …
-
Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana
… mixing ratios are depressed in the spring. The small-scale structure of the clouds appears to be controlled by gravity waves propagating upward through the clouds. Lidar measurements of the mesospheric Na layer at the South Pole in 1990 and Syowa in 1985 are used to characterize mesopause region …
-
Physics-informed neural networks (PINNs) in nonlocal elasticity [Reti neurali Informate dalla fisica (PINNs) nell’elasticità non locale]
Questa tesi esamina l’integrazione di nanomateriali e nanostrutture sostenibili nei sistemi Micro- e Nano-Elettro-Meccanici (MEMS/NEMS), con particolare attenzione allo sviluppo di formulazioni continue non locali per strutture di piccola scala. Vengono introdotti i concetti fondamentali …
-
Distribution patterns of fish during the planktonic period of their life history
… distributions, and these were described on scales encompassing broad areas of the outer Hauraki Gulf and smaller areas of 1 - 100m. The ages of these small fish were also investigated by examining daily increments in the otoliths, and this allowed a more complete interpretation of …