4,053 research outputs found
Alien Registration- Morin, Marie A. (Saint Agatha, Aroostook County)
https://digitalmaine.com/alien_docs/33137/thumbnail.jp
Quantitative Risk-Based Analysis for Military Counterterrorism Systems
The article of record as published may be found at http://dx.doi.org/10.1002/sysThis paper presents a realistic and practical approach to quantitatively assess the risk-reduction
capabilities of military counterterrorism systems in terms of damage cost and casualty
figures. The comparison of alternatives is thereby based on absolute quantities rather than
an aggregated utility or value provided by multicriteria decision analysis methods. The key
elements of the approach are (1) the use of decision-attack event trees for modeling and
analyzing scenarios, (2) a portfolio model approach for analyzing multiple threats, and (3) the
quantitative probabilistic risk assessment matrix for communicating the results. Decision-attack
event trees are especially appropriate for modeling and analyzing terrorist attacks where
the sequence of events and outcomes are time-sensitive. The actions of the attackers and the
defenders are modeled as decisions and the outcomes are modeled as probabilistic events.
The quantitative probabilistic risk assessment matrix provides information about the range
of the possible outcomes while retaining the simplicity of the classic safety risk assessment
matrix based on Mil-Std-882D. It therefore provides a simple and reliable tool for comparing
alternatives on the basis of risk including confidence levels rather than single point estimates.
This additional valuable information requires minimal additional effort. The proposed approach
is illustrated using a simplified but realistic model of a destroyer operating in inland
restricted waters. The complex problem of choosing a robust counterterrorism protection
system against multiple terrorist threats is analyzed by introducing a surrogate multi-threat
portfolio. The associated risk profile provides a practical approach for assessing the robustness
of different counterterrorism systems against plausible terrorist threats. The paper documents the analysis for a hypothetical case of three potential threats.This work was performed as part of the Naval Postgraduate School institutionally funded research
Implications of the Dirac CP phase upon parametric resonance for sub-GeV neutrinos
We perform an analytic and numerical study of parametric resonance in a three-neutrino framework for sub-GeV neutrinos which travel through a periodic density profile. Commensurate with the initial level of approximation, we develop a parametric resonance condition similar to the exact condition for two-neutrino systems. For a castle-wall density profile, the νeâνΟ oscillation probability is enhanced significantly and bounded by cos2θ23. The CP phase δ enters into the oscillation probability as a phase shift. For several cases, we examine the interplay between the characteristics of the castle-wall profile and the CP phase and determine which profiles maximize the separation between oscillations with δ=0,ÂąĎ2,Ď. We also consider neutrinos which travel along a chord through the Earth, passing from the mantle to core and back to mantle again. Significant enhancement of the oscillation probability is seen even in the case in which the neutrino energy is far from the MSW resonant energies. At 500 GeV, the difference between oscillation probabilities with δ=0 and δ=Ď2 is maximized
Control and Manipulation of Cold Atoms in Optical Tweezers
Neutral atoms trapped by laser light are amongst the most promising
candidates for storing and processing information in a quantum computer or
simulator. The application certainly calls for a scalable and flexible scheme
for addressing and manipulating the atoms. We have now made this a reality by
implementing a fast and versatile method to dynamically control the position of
neutral atoms trapped in optical tweezers. The tweezers result from a spatial
light modulator (SLM) controlling and shaping a large number of optical
dipole-force traps. Trapped atoms adapt to any change in the potential
landscape, such that one can re-arrange and randomly access individual sites
within atom-trap arrays.Comment: 6 pages, 4 figure
Effects of chloride ion substitutes and chloride channel blockers on the transient outward current in rat ventricular myocytes
AbstractThe Cai2-insensitive transient outward current, ilo was studied at 20â24°C in rat ventricular myocytes with the whole cell recording patch-clamp technique. The current was recorded before and after replacement of chloride by methanesulfonate or aspartate or in the absence and the presence of chloride channel blockers, SITS or 9-anthracene carboxylic acid. In control conditions (in the presence of external divalent cations, Ca2+ and Cd2+, Cd2+ being used to suppress Ca2+ current), ilo inactivation was composed of a fast and a slow component. When methanesulfonate was substituted for external Clâ the peak current decreased to a variable extent, but the inactivation of the remaining current was still composed of a fast and a slow component. In contrast, the inactivation of the difference current was well fitted by a single exponential. The time to peak of the difference current was shorter than that of the current recorded either in the absence or the presence of methanesulfonate. Both activation- and steady-state inactivation-voltage curves were either unchanged (n = 4) or shifted by a few mV (5.5 mV, n = 14) towards positive potentials when methanesulfonate was substituted for Clâ The current remaining in methanesulfonate reversed at potentials closed to EK. The difference current was composed of a peak and a steady-state component. The peak was suppressed by 4-aminopyridine whereas the steady-state component was not. The peak was also suppressed when pipette solution contained Cs+ instead of K+ but was still present when the Hepes concentration in both external and pipette media was increased 5-fold (50 mM vs. 10 mM). When aspartate was substituted for Clâ or when 2 mM SITS was added to the external solution (in the absence of Ca2+ and Cd2+ because aspartate is known to chelate Ca2+ ions and possibly other divalent cations), ilo was reduced to a similar extent in the two cases and the difference current was composed of a peak (inactivation fitted by a single exponential) and a steady-state component. The SITS-sensitive transient current reversed at a potential close to ECl When 5 mM 9-anthracene carboxylic acid was added to external solution (in the presence of Ca2+ and Cd2+), the peak of the difference current was similar to that observed when Clâ was substituted by methanesulfonate. The difference current resulting from the substitution of methanesulfonate for chloride was not changed when the pipette solution contained either 50 mM EGTA (instead of 5 mM) or 10 mM EGTA and 10 mM BAPTA. The nature of Cs+- and 4-aminopyridine-sensitive transient outward current suppressed by chloride ion substitutes or chloride channel blockers is discussed
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