The software of the LEP beam orbit measurement system [1] allows the acquisition of the beam position for over 1000 consecutive turns. The acquisition can be synchronized to a deflection by a kicker in order to observe coherent betatron oscillations. In this paper we describe the use of this technique to study the dependence of head-tail damping on beam parameters and the tune dependence on the...

We obtain the adiabatic Berry phase by defining a generalised gauge potential whose line integral gives the phase holonomy for arbitrary evolutions of parameters. Keeping in mind that for classical integrable systems it is hardly clear how to obtain open-path Hannay angle, we establish a connection between the open-path Berry phase and Hannay angle by using the parametrised coherent state appro...

PHASE-SENSITIVE AND DUAL-ANGLE RADIOFREQUENCY MAPPING IN NA MAGNETIC RESONANCE IMAGING Steven P. Allen Department of Physics and Astronomy Bachelor of Science Many diagnostic applications in sodium magnetic resonance imaging (MRI) require accurate flip angle mapping. In search for a mapping technique that performs well in sodium MRI, we evaluated the low signal-to-noise ratio performance of the...

Objective(s)Bioelectrical impedance is the measure of impedance of the body. Impedance consists of electric resistance and reactance. Phase angle (PA) is the tan value of the ratio of reactance versus electric resistance. PA depends on cell membrane integrity and on body cell mass. There exists a correlation between PA values and body cell mass.The objective of this study was to compare the PA ...

This paper presents some of the results of the simulation in the radiation section of an industrial boiler using an advanced mathematical model. Calculations are described for the flow, heat transfer, and chemical reaction processes occurring within a gas-fired cylindrical furnace. The calculation procedure is a two dimensional one in which the main hydrodynamic variables are the velocity and s...

For lifting entry vehicle, angle of attack is one of the most important trajectory control inputs. This paper aims to develop a practical and effective method for angle of attack design. First, the factors which impact angle of attack are analyzed. The entry flight is discussed as equilibrium glide phase and initial diving phase respectively. And the operation zone of angle of attack is obtaine...

the manner of spray the fuel has an important effect on stability and convenient mixture of fuel and oxidizer. swirl injectors because of formation of uniform spray cone and proper distribution of the fuel have been used in many rocket engines at aerospace industries. formation and development of air core in the interior stream of swirl injectors and simulation of them is complicated. double ba...

Abstract To date, MoS 2 can only be achieved at microscale. Edge pinning effect caused by structure defects is the most obvious barrier to expand size of structural superlubricity macroscale. Herein, we plan pin edge planes with nanospheres, and then incommensurate formed between adjacent rolling nanoparticles reduce friction. The sputtered film was prepared physical vapor deposition (PVD) in a...