Imaging light transport at the femtosecond scale
Title | Imaging light transport at the femtosecond scale PDF eBook |
Author | Lorenzo Pattelli |
Publisher | Firenze University Press |
Pages | 152 |
Release | 2018 |
Genre | |
ISBN | 8864537805 |
Advanced Ground-Based Real and Synthetic Aperture Radar
Title | Advanced Ground-Based Real and Synthetic Aperture Radar PDF eBook |
Author | Lapo Miccinesi |
Publisher | Firenze University Press |
Pages | 146 |
Release | 2022 |
Genre | Technology & Engineering |
ISBN | 8855183761 |
Ground-based/terrestrial radar interferometry (GBRI) is a scientific topic of increasing interest in recent years. The GBRI is used in several field as remote sensing technique for monitoring natural environment (landslides, glacier, and mines) or infrastructures (bridges, towers). These sensors provide the displacement of targets by measuring the phase difference between sending and receiving radar signal. If the acquisition rate is enough the GBRI can provide the natural frequency, e.g. by calculating the Fourier transform of displacement. The research activity, presented in this work, concerns design and development of some advanced GBRI systems. These systems are related to the following issue: detection of displacement vector, Multiple Input Multiple Output (MIMO) and radars with 3D capability.
Functional validation of genetic variants identified by next generation sequencing in malformations of cortical development
Title | Functional validation of genetic variants identified by next generation sequencing in malformations of cortical development PDF eBook |
Author | Dalila De Vita |
Publisher | Firenze University Press |
Pages | 68 |
Release | 2022 |
Genre | Medical |
ISBN | 8855183435 |
Malformations of cortical development (MCDs) result from a disruption in the process of the human brain cortex formation: currently, there are no pharmacological treatments for diffuse MCDs. Next-generation sequencing has accelerated the identification of MCDs causing genes: in some cases, functional studies are needed to clarify the role of genetic variants. The aim of this PhD project has been to apply a multidisciplinary approach to identify causative mutations in patients with MCDs, validate the pathogenic role of the identified mutations, and assess the effectiveness of novel in vitro treatment for mTOR pathway related MCDs.
Tectono-metamorphic evolution of the continental units along the edge between Alpine and Hercynian Corsica
Title | Tectono-metamorphic evolution of the continental units along the edge between Alpine and Hercynian Corsica PDF eBook |
Author | Maria Di Rosa |
Publisher | Firenze University Press |
Pages | 224 |
Release | 2022 |
Genre | Science |
ISBN | 8855184199 |
In this work the central area of Corsica island was studied in order to reconstruct the tectono-metamorphic history of the continental and oceanic high pressure units that occupy the structurally deeper levels of the tectonic stacking of Alpine Corsica and their stratigraphic and structural relationship with the European margin (Hercynian Corsica). The study includes the geological mapping, the mesoscale and microscale structural analysis, the acquisition of chemical analyzes and micromaps with the microprobe, thermobarometric estimation through specific methodologies for metapelites, U-Th-Pb dating of zircons and allanites. The results obtained allows to reconstruct the geodynamic model of this sector of the Alpine belt from the Permian to the Burdigalian.
Isotopic fractionation study towards massive star-forming regions across the Galaxy
Title | Isotopic fractionation study towards massive star-forming regions across the Galaxy PDF eBook |
Author | Laura Colzi |
Publisher | Firenze University Press |
Pages | 232 |
Release | 2022 |
Genre | Science |
ISBN | 8855183796 |
One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. In the present study new astronomical observations devoted to the study of hydrogen and nitrogen fractionation (D/H and 14N/15N ratios) of molecules, towards massive star-forming regions in different evolutionary phases, have been presented. Moreover, a new detailed theoretical study of carbon fractionation, 12C/13C ratios, has been done. One of the main results was the confirmation that the 14N/15N ratio increases with the galactocentric distance, as predicted by stellar nucleosynthesis Galactic chemical evolution models. This work gives new important inputs on the understanding of local chemical processes that favor the production of molecules with different isotopes in star-forming regions.
Femtosecond Transient Imaging
Title | Femtosecond Transient Imaging PDF eBook |
Author | Ghulam Ahmed Kirmani |
Publisher | |
Pages | 64 |
Release | 2010 |
Genre | |
ISBN |
This thesis proposes a novel framework called transient imaging for image formation and scene understanding through impulse illumination and time images. Using time-of-flight cameras and multi-path analysis of global light transport, we pioneer new algorithms and systems for scene understanding through time images. We demonstrate that our proposed transient imaging framework provides opportunities to accomplish tasks that are well beyond the reach of existing imaging technology. For example, one can infer the geometry of not only the visible but also the hidden parts of a scene, enabling us to look around corners. Traditional cameras estimate intensity per pixel I(x, y). Our transient imaging camera prototype captures a 3D time-image I(x, y, t) for each pixel and uses an ultra-short pulse laser for flash illumination. Emerging technologies are supporting cameras with a temporal-profile per pixel at picosecond resolution, allowing us to capture an ultra-high speed time-image. This time-image contains the time profile of irradiance at a sensor pixel. The speed of light is relevant at these imaging time scales, and the transient properties of light transport come into play. In particular we furnish a novel framework for reconstructing scene geometry of hidden planar scenes. We experimentally corroborated our theory with free space hardware experiments using a femtosecond laser and a picosecond accurate sensing device. The ability to infer the structure of hidden scene elements, unobservable by both the camera and illumination source, will create a range of new computer vision opportunities.
Computational Imaging for Scene Understanding
Title | Computational Imaging for Scene Understanding PDF eBook |
Author | Takuya Funatomi |
Publisher | John Wiley & Sons |
Pages | 356 |
Release | 2024-05-21 |
Genre | Computers |
ISBN | 1789451507 |
Most cameras are inherently designed to mimic what is seen by the human eye: they have three channels of RGB and can achieve up to around 30 frames per second (FPS). However, some cameras are designed to capture other modalities: some may have the ability to capture spectra from near UV to near IR rather than RGB, polarimetry, different times of light travel, etc. Such modalities are as yet unknown, but they can also collect robust data of the scene they are capturing. This book will focus on the emerging computer vision techniques known as computational imaging. These include capturing, processing and analyzing such modalities for various applications of scene understanding.