To solve the long object problem, an exact and efficient algorithm has been recently developed by Katsevich. While the Katsevich algorithm only works with standard helical cone-beam scanning, there is an important need for nonstandard spiral cone-beam scanning. Specifically, we need a scanning spiral of variable radius for our newly proposed electron-beam CT/micro-CT prototype. In this paper, f...

Title of Document: INTENSE LASER ACCELERATION OF QUASI-MONOENERGETIC PROTONS Tung-Chang Liu, Doctor of Philosophy, 2013 Directed By: Professor Chuan S Liu, Physics By irradiating an ultra-thin overdense foil with an intense circularly polarized laser beam, the laser radiation pressure can push the foil forward. This scheme, laser radiation pressure acceleration, is one of the most actively stud...

A mobile ad-hoc network (MANET) is a characteristized by multi-hop wireless links, in the absence of any cellular infrastructure, as well as frequent host mobility. Existing on-demand multicasting protocols are categorized into tree-based and mesh-based strategies. In this paper, we propose a new on-demand multicast routing protocol, named spiral-fat-tree-based on-demand multicast protocol (SOM...

The holographic scattering phenomenon was observed and studied in detail for azobenzene-containing polymer system. It was found that irradiation of 25-μm-thick samples of the polymer with a single linearly polarized laser beam results in the appearance of a band with the maximum in the vicinity of irradiating wavelength in polarized extinction spectra. The band is completely polarized along the...

conclusion spiral-ct scan is superior to conventional ct in the diagnosis of lesions in com before operation. it can be used for detailed evaluation of ossicular chain in such patients. objectives this study was performed to compare the findings of three-dimensional reconstructed spiral and conventional ct scan of ossicular chain study in patients with com. patients and methods fifty patients e...

In magnetic resonance imaging (MRI), methods that use a non-Cartesian, e.g. spiral, grid in k-space are becoming increasingly important. This talk focuses on a recently proposed implicit discretisation scheme which generalises the standard approach based on gridding. While the latter succeeds for sufficiently uniform sampling sets and accurate estimated density compensation weights, the implici...

We investigate recent claims that the Hubble sequence of spiral galaxies is scalefree. Fundamental to this investigation is the fact that within the photometric data of 86 spiral galaxies from de Jong & van der Kruit (1994) from which these claims were made a trend exists between morphological type and bulge profile shape. While late-type spiral bulges are described by an exponential luminosity...

INTRODUCTION Low SNR of proton magnetic resonance spectroscopic imaging (MRSI) in vivo data for a small voxel size (e.g., 0.4cc) necessitates multiple-average acquisition that leads to a long scan time. This issue is even more pronounced when one attempts to acquire J-resolved spectroscopic data using multi-echo acquisition [3] in order to resolve metabolite concentrations such as glutamate and...

Partial shading causes mismatch losses in the solar PV system. In array, power output from healthy modules is gone vain due to losses. The array construction with high resistivity loss generation progressing research work field. this work, a new kind of configuration scheme framed for system overcoming effect partial shading. proposed has over other conventional methods. pattern that similar sp...