769 research outputs found
Evaluation of retention methods on MBC 455 connector contacts
Electric contact of connector in S-1C-5 vehicle distributo
Exploring the Multi-Mode Structure of Atom-Generated Squeezed Light
Squeezed states of light, i.e., quantum states exhibiting reduced noise statistics, may be used to greatly enhance the sensitivity of light-based measurements. We study a squeezed vacuum field generated in hot Rb vapor via the polarization self-rotation effect. By propagating a strong pump beam through an atomic vapor cell, we were able to achieve a noise suppression of 2.7 dB below shot noise. Our previous work revealed that this amount of noise suppression may be limited by the excitement of higher order modes in the squeezed field during the atom-light interaction. Once incident on the homodyne detection scheme, these higher order modes may induce an imperfect mode match between the squeezed field and the local oscillator (LO). In this work, we used a liquid-crystal-based spatial light modulator to modify the spatial mode structure of the pump and LO beams. We demonstrate that optimization of the spatial modes can lead to higher detected noise suppression
A Collaborative Web Application for the Lebu Migration
From the years 1000 to 1790, the families of the Lebu collective migrated from the Hodh region of present-day Mauritania, across Senegal, to the Cap-Vert Peninsula. Dr. John Glover, Professor and Chair of the Department of History at the University of Redlands, studies the history of the Lebu. In his research, Dr. Glover gathered the locations of many of the Lebu village sites, with plans to analyze the patterns of the Lebu migration. This project developed a web GIS application with which the client would be able to visualize the Lebu migration patterns and share the information worldwide. Additionally, the web application allows the users to contribute additional data about the Lebu migration, improving the database
Explicit Integration of Extremely-Stiff Reaction Networks: Quasi-Steady-State Methods
A preceding paper demonstrated that explicit asymptotic methods generally
work much better for extremely stiff reaction networks than has previously been
shown in the literature. There we showed that for systems well removed from
equilibrium explicit asymptotic methods can rival standard implicit codes in
speed and accuracy for solving extremely stiff differential equations. In this
paper we continue the investigation of systems well removed from equilibrium by
examining quasi-steady-state (QSS) methods as an alternative to asymptotic
methods. We show that for systems well removed from equilibrium, QSS methods
also can compete with, or even exceed, standard implicit methods in speed, even
for extremely stiff networks, and in many cases give somewhat better
integration speed than for asymptotic methods. As for asymptotic methods, we
will find that QSS methods give correct results, but with non-competitive
integration speed as equilibrium is approached. Thus, we shall find that both
asymptotic and QSS methods must be supplemented with partial equilibrium
methods as equilibrium is approached to remain competitive with implicit
methods.Comment: Updated reference
Boundary Conditions in Stepwise Sine-Gordon Equation and Multi-Soliton Solutions
We study the stepwise sine-Gordon equation, in which the system parameter is
different for positive and negative values of the scalar field. By applying
appropriate boundary conditions, we derive relations between the soliton
velocities before and after collisions. We investigate the possibility of
formation of heavy soliton pairs from light ones and vise versa. The concept of
soliton gun is introduced for the first time; a light pair is produced moving
with high velocity, after the annihilation of a bound, heavy pair. We also
apply boundary conditions to static, periodic and quasi-periodic solutions.Comment: 14 pages, 8 figure
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