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Showing 1 to 20 of 26 for “"Decay constant"”.
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Experimental determination of the buckling for unusual geometrical shapes using paraffin
The buckling constant for neutron moderators in the shape of an elliptic cylinder, hemisphere, and"piggy-back" cylinder has been determined by experimental measurements using paraffin as a moderator. The pulsed neutron sources technique was used throughout the work; a fast neutron burst of short …
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Effects of silver nanoparticles on photochemical processes focusing on luminol chemiluminescence
… of tryptophan fluorescence, a ruthenium complex decay constant and chemiluminescence of luminol and ferricyanide, were studied. The tryptophan fluorescence was slightly enhanced by smaller nanoparticles and showed slight quenching in the presence of larger nanoparticles. The tris (2,2’-bipyridyl …
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The Staggered Chiral Perturbation Theory In The Two-Flavor Case And Su(2) Chiral Analysis Of The Milc Data
… in the two-flavor case. The pion mass and decay constant are calculated through NLO for a partially-quenched theory. In the limit where the strange quark mass is large compared to the light quark masses and the taste splittings, I show that the SU(2) staggered chiral theory emerges from the …
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Limits on subcritical reactivity determination using rossi-alpha and related methods
… inferred from measurements of the prompt neutron decay constant, α. Near critical, the reactivity is linearly proportional with α, but the linearity between these quantities does not hold in systems with low multiplication or significantly above prompt critical. This work examines a large range of …
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Modern Rossi alpha measurements
The Rossi-α method determines the prompt neutron decay constant in a nuclear fissioning system at or near delayed critical. Knowledge of the prompt neutron decay constant is important for a critical system as it is a major contributor to the dynamic system behavior. The classical method for the …
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Greenhouse Gas Mitigation and Management Strategies for Methane Reduction from Waste in Victoria, British Columbia, Canada.
… flaring, emissions, oxidation and the decay constant from biosolids placed into the Hartland Landfill was estimated. In order to maintain long-term methane mitigation, a helpful road map for local decision-makers is suggested including rapidly increasing organics diversion and anaerobic …
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Measurements of B(Ds -> lvl) and fDs using data collected from the BaBar experiment
… -> lvl) and measurements of the pseudoscalar decay constant, fDs , using all the data acquired at the BaBar detector at SLAC National Accelerator Laboratory, which were collected from September 1999 to April 2007, and comprised 531 fb-1. The following mea- surements are made: B(Ds -> eve) = …
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Adaptive methods for meteor burst communications
… length of the message and the underdense trail decay constant. It is shown that the signal power required to obtain a given probability of success is significantly smaller for optimal variable-rate coding than for fixed-rate coding.
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Pulsed neutron measurements of the diffusion parameters of heavy and light water mixtures at several temperatures
… bursts. The values of the infinite medium decay constant, λ₀, were computed by a least squares fit of λ versus B² data to the expression: λ = λ + D₀B² - CB⁴ The parameters D₀, C, and λ𝗍ᵣ were determined from the above expression after rearranging: λ-λ₀ = D B² - CB⁴ The resulting values of …
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Measurement of the dependence of the averaged internal mode on the scattering vector and of the first internal mode on the concentration of polystyrene in solution using photon correlation spectroscopy
… function can be written as a sum of decaying exponentials. The center-of-mass mode with a decay constant Dq{dollar}\sp2{dollar} is contained in every mode. D is the polymer diffusion coefficient and can be measured in low angle light scattering experiments and q is the magnitude of …
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Measurement of the first internal mode of polystyrene in cyclohexane and toluene through dynamic light scattering
… on an Apple IIe computer. The exponential decay constants derived from these fits were further used to obtain a value of {dollar}\tau\sb1{dollar} in each solvent and also to find the power relation between these decay constants and q, the magnitude of the scattering wave vector. The …
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Characterization of the Intrinsic Neural Timescale Indices as a Reliable Fingerprint of Brain Dynamics
… of Positive ACFs, ACF at Half Lag, Exponential Decay Constant (τ)— using resting-state fMRI data from 400 cortical regions across a large, lifespan sample (ages 6– 85) from the NKI-Rockland dataset. A discriminability analysis revealed that the AR(1) coefficient provided the highest test-retest …
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Estimation of the strength of a radioactive source
… of the strength of a radioactive source when decay is rapid so that the usual assumption of a Poisson distribution of counts is not applicable. We distinguish two main cases according as the background radiation is small or large. In the former case the common procedure of simply subtracting …
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Static and dynamic properties of the pion from continuum modelling of strong QCD
… we find significant changes for the mass and decay constant of the pion. For the pion form factor, on the other hand, we find no qualitative changes in the $Q^{2}$ region studied for both vertices. Nevertheless, more work remains to be done at and beyond the rainbow-ladder truncation in order …
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High A-scan rate optical coherence tomography angiography for blood flow speed quantification in the retina
… are used to evaluate a temporal autocorrelation decay constant, α, as a marker for blood flow speed. A 600 kHz A-scan rate swept-source OCT prototype instrument provides short interscan time OCTA and fine A-scan spacing acquisition, while maintaining multi mm2 field-of-views for human retinal …
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The measurement of neutron diffusion parameters in heavy and light water concentrations by the pulsed neutron technique
… were determined from the expansion of the decay constant to second order using iteration procedure. The values of Dₒ, C, and A<sub>tr</sub> are tabulated below for the various concentrations, including pure H₂O and D₂O. <table style="width:100%"> <tr> <th>Percent D₂0</th> <th>Dₒ x 10⁻⁴ …
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Ultrafast Ionisation Dynamics Induced by Short Proton Pulses
… ± 0.7 psis reported, enabled by the ultra fast decay pathways available to excited electrons in the formation of self-trapped excitonic states.The role of defects in the recovery of an induced opacity is examined in borosilicate glass. Here the recovery time of the opacity is measured to be …
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Characterization and Inhibition of the Dimer Interface in Bacterial Small Multidrug Resistance Proteins
… synthetic TM4 peptide mimetic. Using exponential decay measurements from a real-time cellular efflux assay, we observed the efflux decay constant was decreased by up to ~60% after treatment with the TM4 peptide inhibitor compared to control peptide treatments. Our results suggest that this …
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Neutron beam monitoring for single-event effects testing
… to be determined either indirectly based on the decay constant of the pulse interval distributions or directly on the basis of detection rates and sensor pulse widths. The optimum of sensor pulse width has been investigated in order to achieve the maximum of probability of detection with adequate …
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Geophysical Imaging of Earth Processes: Electromagnetic Induction in Rough Geologic Media, and Back-Projection Imaging of Earthquake Aftershocks
… new shallow cluster. The b-value or the temporal decay constant were not changed by inclusion of the small events; however, they are different for two completeness periods and are different at shallow depth than greater depth.
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