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Preferential adsorption of noble gases in zeolitic tuff with variable saturation: A modeling study of counter-intuitive diffusive-adsorptive behavior.
J Environ Radioact
January 2025
Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, 87545, NM, USA.
Noble gas transport through geologic media has important applications in the prediction and characterization of measured gas signatures related to underground nuclear explosions (UNEs). Retarding processes such as adsorption can cause significant species fractionation of radionuclide gases, which has implications for measured and predicted signatures used to distinguish radioxenon originating from civilian nuclear facilities or from UNEs. Accounting for the effects of variable water saturation in geologic media on tracer transport is one of the most challenging aspects of modeling gas transport because there is no unifying relationship for the associated tortuosity changes between different rock types, and reactive transport processes such as adsorption that are affected by the presence of water likewise behave differently between gas species.
View Article and Find Full Text PDFDevelopment of a rapid screener to elicit patient preferences for antiseizure medication discontinuation.
Epilepsy Behav
December 2024
University of Michigan, Department of Neurology, Ann Arbor, MI, USA. Electronic address:
Objective: While guidelines encourage individualized discussions of the risks and benefits of antiseizure medication (ASM) withdrawal after a period of seizure-freedom, no formal methods exist for assessing patient preferences. We report the initial development of a rapid patient preferences screener.
Methods: We conducted a mixed-methods study of adults who were ≥1 year seizure-free and seen for epilepsy across three institutions.
Accuracy of a Rapid-Response EEG's Automated Seizure-Burden Estimator: AccuRASE Study.
Neurology
January 2025
Neurology, Yale School of Medicine, New Haven, CT.
Background And Objectives: The use of rapid response EEG (rr-EEG) has recently expanded in limited-resource settings and as a supplement to conventional EEG to rapidly detect and treat nonconvulsive status epilepticus. The study objective was to test the accuracy of an rr-EEG's automated seizure burden estimator (ASBE).
Methods: This is a retrospective observational study using multiple blinded reviewers.
Cerebral blood flow and arterial responses in migraine: history and future perspectives.
J Headache Pain
December 2024
Translational Research Center and Danish Headache Center, Rigshospitalet, University of Copenhagen, Nordstjernevej 42, Glostrup, Copenhagen, 2600, Denmark.
Introduction: It is largely accepted that migraine with aura (MA) is caused by cortical spreading depression (CSD) and that migraine without aura (MO) is not. This is mostly based on old studies of regional cerebral blood flow (rCBF) and studies of vascular responses. These studies are partly forgotten today and may, therefore, be worthwhile reviewing.
View Article and Find Full Text PDFReevaluation of the Suitability of Xe Nuclear Magnetic Resonance Spectroscopy for Pore Size Determination in Porous Carbon Materials.
J Am Chem Soc
December 2024
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan.
Xenon isotope nuclear magnetic resonance (Xe-NMR) spectroscopy has been widely used to evaluate the pore structure of materials. However, determining how to apply this technique to investigate porous carbon materials is sometimes challenging, partly due to the structural disorder and heterogeneity of the surface properties of these materials, and partly due to the lack of reliable methods for controlling and assessing the density of adsorbed Xe. In this study, we designed and constructed a temperature- and pressure-controllable Xe-NMR system to evaluate the interaction between activated carbon (AC) and adsorbed Xe molecules.
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