437 research outputs found
Imaging-based Parametric Resonance in an Optical Dipole Atom Trap
We report sensitive detection of parametric resonances in a high-density
sample of ultracold atoms confined to a far-off-resonance optical
dipole trap. Fluorescence imaging of the expanded ultracold atom cloud after a
period of parametric excitation shows significant modification of the atomic
spatial distribution and has high sensitivity compared with traditional
measurements of parametrically-driven trap loss. Using this approach, a
significant shift of the parametric resonance frequency is observed, and
attributed to the anharmonic shape of the dipole trap potential
A scaling law for light scattering from dense and cold atomic ensembles
We calculate the differential cross section of polarized light scattering
from a cold and dense atomic ensemble. The regularities in the transformation
of the cross section when increasing the size of the atomic ensemble are
analyzed numerically. We show that for typical experimental conditions, an
approximate scaling law can be obtained. Very good agreement is found in a
comparison with experimental data on the size dependence of a dense and cold
cloud of 87$Rb atoms.Comment: Submitted to Journal of Modern Optics, Special issue on the
Proceedings of the Colloquium on the Physics of Quantum Electronic
Some features of flow and particle transport in porous structures
There has been a growing interest in the study of porous and complex flow structures due to its impact in technology. This concerns not only environmental but also diagnostic and therapeutic exposure in medical research. Physics of flow within porous structures is especially important to model transport and deposition of viruses, pollutants and drugs deep in these structures. In this work we analyze numerically low and medium Reynolds number flows in axisymmetric cylindrical duct surrounded by a torus. We also consider three different particle sizes (0.02, 0.1 and 20 micron) for possible physiological and environmental applications
Vibration control of the beam of the future linear collider
This paper proposes a new approach for beam stabilization of the future Compact LInear Collider (CLIC). The method attempts to increase the efficiency of traditional methods. It is composed of a hybrid adaptive filtering algorithm that uses both feedback and adaptive control. The scheme uses an estimate of the prediction error to update the adaptive filter's parameters. The strategy of this method is described considering the process environment. The method efficiency is evaluated, and it is demonstrated that it provides high damping, fast vibration suppression, good robustness and easy realization thanks to the simplicity of the computations
Understanding Occupational and Skill Demand in New Jersey's Construction Industry
The construction industry is integral to New Jersey's economy, employing over 160,000 people. Nationally and in New Jersey, the construction industry is thriving, injecting billions of dollars into the state. Jobs in the industry are changing with an influx of new technology and new building materials, requiring that workers have more technical expertise than in the past. This report summarizes the skill, knowledge, and educational requirements of key construction occupations and identifies strategies for meeting the key workforce challenges facing the industry
Understanding Occupational and Skill Demand in New Jersey's Health Care Industry
The health care industry in New Jersey employs almost 350,000 people. However, state, national, and international shortages of nurses is raising widespread concern in the industry. Jobs in the industry are changing in response to pressures to control costs and the demands of an increasingly consolidated industry. This report summarizes the skill, knowledge, and educational requirements of key health care occupations and identifies strategies for meeting the workforce challenges facing the industry
Understanding Occupational and Skill Demand in New Jersey's Finance Industry
The finance industry in New Jersey employs over 200,000 people. Many more workers benefit from the state's proximity to the finance industry in New York City. Jobs in the industry are evolving rapidly in response to national and global trends, such as deregulation, increasingly complex laws, and new technologies. As jobs change, skill requirements for both entry-level and incumbent workers increase. This report summarizes the skill, knowledge, and educational requirements of key finance occupations and identifies strategies for meeting the workforce challenges facing the industry
Ready for Tomorrow: Demand-Side Emerging Skills for the 21st Century
As part of the Ready for the Job demand-side skill assessment, the Heldrich Center explored emerging work skills that will affect New Jersey's workforce in the next three to five years. The Heldrich Center identified five specific areas likely to generate new skill demands: biotechnology, security, e-learning, e-commerce, and food/agribusiness. This report explores the study's findings and offers recommendations for improving education and training in New Jersey
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