22 results for "Forget, Benoit"
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Journal Article Full text
Cross section modeling using Monte Carlo tally derivatives for transient multiphysics prediction
Monte Carlo neutron transport is often seen as the standard for accurate neutronics simulation of nuclear reactors in steady-state. However, the time dependent equation includes time derivatives of flux and delayed neutron precursors which are difficult to model and tally. In this work, a…
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Preliminary Generation of Windowed Multipole Covariance Data
A methodology for the generation of covariance data in the windowed multipole formalism for resolved resonance data was developed. Using this process, covariance matrices were created for oxygen-16, uranium-235, and uranium-238, such that sampled cross-sections would match a user-selected average…
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Journal Article
Simulating hydrogen diffusion in a zirconium hydride moderator block and its impact on steady state neutronic-thermal behavior
Zirconium hydride is a widely used moderator in compact reactor designs due to its high thermal limits and high hydrogen density, both of which being desirable feature. However, a notable characteristic of zirconium hydride is the substantial mobility of hydrogen within the metal lattice…
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Simulating Hydrogen Diffusion in ZrH Moderator and its Impact on Coupled Neutronic-Thermal Simulation of a Heat Pipe Microreactor
Metal hydride moderators are a common material choice for moderating compact reactor designs, as their high thermal limits and high density of hydrogen make them favorable for operation. One additional attribute of metal hydrides, zirconium hydride in particular, is the relatively large mobility of…
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Preprint Full text
Modeling Decay Heat with a Simplified Depletion Chain in OpenMC
OpenMC can be used to computationally model depletion and produce estimates of decay heat. As an input to depletion simulations, OpenMC requires a depletion chain that details nuclide transmutation pathways. The simplified CASL depletion chain was designed to track relatively few nuclides while…
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Add 3D Plotting to Your Monte Carlo Code In A Few Hours
Any Monte Carlo transport code can produce 2D slice plots of geometric inputs using sampling of cell or material identifiers at each pixels’ point in space; ray-traced 3D plots of simulation geometries are generally less available or require paid or closed-source software. We demonstrate the ease…
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A Compact Model for Unresolved Resonance Region Cross Sections
For decades, the probability table technique has been used to model the behavior of neutron cross sections in the unresolved resonance region with a stochastic approach. Early work from Hwang hinted at the possibility of a universal probability distribution to fit the URR cross section…
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IMPROVED THERMAL SCATTERING DATA PREPARATION
Convenient access to accurate nuclear data, particularly data describing low-energy neutrons, is crucial for trustworthy simulations of thermal nuclear systems. Obtaining the scattering kernel for thermal neutrons (i.e., neutrons with energy ~1 eV or less) can be a difficult problem, since the…
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Evaluating Embedded Monte Carlo vs. Total Monte Carlo for Nuclear Data Uncertainty Quantification
The purpose of this paper is to compare a new method called Embedded Monte Carlo (EMC) to the well-known Total Monte Carlo (TMC) method for nuclear data uncertainty propagation. Indeed, the TMC methodology is based on the use of a large number of random samples of nuclear data libraries and…
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Journal Article
Extending Embedded Monte Carlo as a novel method for nuclear data uncertainty quantification
The purpose of this paper is to introduce a new approach to compute nuclear data uncertainties called Embedded Monte Carlo (EMC) and compare it to the well-established Total Monte Carlo (TMC) method. While the TMC methodology involves generating numerous random nuclear data library samples and…
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Extinction bursts in rats trained to self-administer nicotine or food in 1-h daily sessions
Extinction bursts are characterized by a temporary increase in responding when drug access is withheld from rats trained to self-administer drugs of abuse. Thus far, one study has examined extinction bursts for nicotine self-administration using a 23-h access paradigm [1]. Here we examined…
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BLOCKING CANNABINOID CB(1) RECEPTORS FOR THE TREATMENT OF NICOTINE DEPENDENCE: INSIGHTS FROM PRECLINICAL AND CLINICAL STUDIES
Tobacco use is one of the leading preventable causes of death in developed countries. Since existing medications are only partially effective in treating tobacco smokers, there is a great need for improved medications for smoking cessation. It has been recently proposed that cannabinoid CB(1)…
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Prediction of spallation induced transmutation rates for long-lived fission products via proton accelerator
Long-lived fission products represent a major challenge in nuclear waste management due to persistent radiotoxicity over very long timescales. This study focuses on six of these fission products: Se-79, Zr-93, Tc-99, Sn-126, I-127, Cs-135. This study investigates the feasibility of…
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Journal Article
Neutron Cross Section Processing Methods for Improved Integral Benchmarking of Unresolved Resonance Region Evaluations
In this work we describe the development and application of computational methods for processing neutron cross section data in the unresolved resonance region (URR). These methods are integrated with a continuous-energy Monte Carlo neutron transport code, thereby enabling their use in high-fidelity…
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Journal Article Full text
Feasibility of a multigroup Boltzmann–Fokker–Planck solution for electron beam dose calculations
Legacy nuclear-reactor Boltzmann solvers start clinical deployment as an alternative to Monte Carlo (MC) codes and Fermi–Eyges semiemprical models in radiation oncology treatment planning. Today’s certified clinical solvers are limited to photon beams. In this paper, ELECTR, a state-of-the-art…
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Noradrenergic α(1) Receptors as a Novel Target for the Treatment of Nicotine Addiction
Nicotine is the main psychoactive ingredient in tobacco and its rewarding effects are considered primarily responsible for persistent tobacco smoking and relapse. Although dopamine has been extensively implicated in the rewarding effects of nicotine, noradrenergic systems may have a larger role…
Also available at: PubMed Central
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Journal Article Full text
Translational strategies for therapeutic development in nicotine addiction: Rethinking the conventional bench to bedside approach
Tobacco produces an impressive burden of disease resulting in premature death in half of users. Despite effective smoking cessation medications (nicotine replacement therapies, bupropion and varenicline), there is a very high rate of relapse following quit attempts. The use of efficient strategies…
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Journal Article Full text
The endocannabinoid system: a new molecular target for the treatment of tobacco addiction
Tobacco addiction is one of the leading preventable causes of mortality in the world and nicotine appears to be the main critical psychoactive component in establishing and maintaining tobacco dependence. Several lines of evidence suggest that the rewarding effects of nicotine, which underlie its…
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Journal Article Full text
Tetris-inspired detector with neural network for radiation mapping
Radiation mapping has attracted widespread research attention and increased public concerns on environmental monitoring. Regarding materials and their configurations, radiation detectors have been developed to identify the position and strength of the radioactive sources. However, due to the…