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Single Phase Medium Entropy U-Based Alloys: Thermodynamics, Synthesis, and Mechanical Behavior
Michael Aizenshtein,Eli Brosh,Shai Silhov,Shlomo Levi,Ziv Ungarish,Eyal Grinberg,Shmuel Hayun 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
High and medium entropy alloys (HEAs and MEAs) exhibit superior resistance to irradiation damage: there is thus greatincentive to study uranium-based HEAs and MEAs. These materials could potentially be suitable candidates for use asnuclear fuels where severe irradiation regimes prevail. In the present study, the ability to predict single phase regions in thequaternary system, Mo–Nb–U–Zr, using thermodynamic calculations was demonstrated and proven experimentally. Similarlyto other known bcc HEAs systems, the bcc phase in the present MEA system was shown to exhibit high yield strengthbut also brittleness. It was also shown that a single phase in the MEA system, Mo–Nb–U–Zr, could be obtained only forcompositions containing no more than 10 at% of Mo.
Levy, Richard H.,Dunbar, Gavin B.,Vandergoes, Marcus J.,Howarth, Jamie D.,Kingan, Tony,Pyne, Alex R.,Brotherston, Grant,Clarke, Michael,Dagg, Bob,Hill, Matthew,Kenton, Evan,Little, Steve,Mandeno, Darc Copernicus GmbH 2018 Scientific drilling Vol.24 No.-
<P><p><strong>Abstract.</strong> A new annually resolved sedimentary record of Southern Hemisphere mid-latitude hydroclimate was recovered from Lake Ohau, South Island, New Zealand, in March 2016. The Lake Ohau Climate History (LOCH) project acquired cores from two sites (LOCH-1 and -2) that preserve sequences of laminated mud that accumulated since the lake formed <span class='inline-formula'>∼</span><span class='thinspace'></span>17<span class='thinspace'></span>000 years ago. Cores were recovered using a purpose-built barge and drilling system designed to recover soft sediment from thick sedimentary sequences in lake systems up to 150<span class='thinspace'></span>m deep. This system can be transported in two to three 40<span class='thinspace'></span>ft long shipping containers and is suitable for use in a range of geographic locations. A comprehensive suite of data has been collected from the sedimentary sequence using state-of-the-art analytical equipment and techniques. These new observations of past environmental variability augment the historical instrumental record and are currently being integrated with regional climate and hydrological modelling studies to explore causes of variability in extreme/flood events over the past several millennia.</p> </P>
Age-dependent root canal instrumentation techniques: a comprehensive narrative review
Solomonov Michael,Kim Hyeon-Cheol,Hadad Avi,Levy Dan Henry,Ben Itzhak Joe,Levinson Oleg,Azizi Hadas 대한치과보존학회 2020 Restorative Dentistry & Endodontics Vol.45 No.2
The aim of this article was to review age-dependent clinical recommendations for appropriate root canal instrumentation techniques. A comprehensive narrative review of canal morphology, the structural characteristics of dentin, and endodontic outcomes at different ages was undertaken instead of a systematic review. An electronic literature search was carried out, including the Medline (Ovid), PubMed, and Web of Science databases. The searches used controlled vocabulary and free-text terms, as follows: ‘age-related root canal treatment,’ ‘age-related instrumentation,’ ‘age-related chemo-mechanical preparation,’ ‘age-related endodontic clinical recommendations,’ ‘root canal instrumentation at different ages,’ ‘geriatric root canal treatment,’ and ‘pediatric root canal treatment.’ Due to the lack of literature with practical age-based clinical recommendations for an appropriate root canal instrumentation technique, a narrative review was conducted to suggest a clinical algorithm for choosing the most appropriate instrumentation technique during root canal treatment. Based on the evidence found through the narrative review, an age-related clinical algorithm for choosing appropriate instrumentation during root canal treatment was proposed. Age affects the morphology of the root canal system and the structural characteristics of dentin. The clinician’s awareness of root canal morphology and dentin characteristics can influence the choice of instruments for root canal treatment.
Age-dependent root canal instrumentation techniques: a comprehensive narrative review
Solomonov, Michael,Kim, Hyeon-Cheol,Hadad, Avi,Levy, Dan Henry,Itzhak, Joe Ben,Levinson, Oleg,Azizi, Hadas The Korean Academy of Conservative Dentistry 2020 Restorative Dentistry & Endodontics Vol.45 No.1
The aim of this article was to review age-dependent clinical recommendations for appropriate root canal instrumentation techniques. A comprehensive narrative review of canal morphology, the structural characteristics of dentin, and endodontic outcomes at different ages was undertaken instead of a systematic review. An electronic literature search was carried out, including the Medline (Ovid), PubMed, and Web of Science databases. The searches used controlled vocabulary and free-text terms, as follows: 'age-related root canal treatment,' 'age-related instrumentation,' 'age-related chemo-mechanical preparation,' 'age-related endodontic clinical recommendations,' 'root canal instrumentation at different ages,' 'geriatric root canal treatment,' and 'pediatric root canal treatment.' Due to the lack of literature with practical age-based clinical recommendations for an appropriate root canal instrumentation technique, a narrative review was conducted to suggest a clinical algorithm for choosing the most appropriate instrumentation technique during root canal treatment. Based on the evidence found through the narrative review, an age-related clinical algorithm for choosing appropriate instrumentation during root canal treatment was proposed. Age affects the morphology of the root canal system and the structural characteristics of dentin. The clinician's awareness of root canal morphology and dentin characteristics can influence the choice of instruments for root canal treatment.
Water Sorption/Desorption Characteristics of Eutectic LiCl-KCl Salt-Occluded Zeolites
Allison Harward,Levi Gardner,Claire M. Decker Oldham,Krista Carlson,유 태식,Guy Fredrickson,Michael Patterson,Michael F. Simpson 한국방사성폐기물학회 2022 방사성폐기물학회지 Vol.20 No.3
Molten salt consisting primarily of eutectic LiCl-KCl is currently being used in electrorefiners in the Fuel Conditioning Facility at Idaho National Laboratory. Options are currently being evaluated for storing this salt outside of the argon atmosphere hot cell. The hygroscopic nature of eutectic LiCl-KCl makes is susceptible to deliquescence in air followed by extreme corrosion of metallic cannisters. In this study, the effect of occluding the salt into a zeolite on water sorption/desorption was tested. Two zeolites were investigated: Na-Y and zeolite 4A. Na-Y was ineffective at occluding a high percentage of the salt at either 10 or 20wt% loading. Zeolite-4A was effective at occluding the salt with high efficiency at both loading levels. Weight gain in salt occluded zeolite-4A (SOZ) from water sorption at 20% relative humidity and 40℃ was 17wt% for 10% SOZ and 10wt% for 20% SOZ. In both cases, neither deliquescence nor corrosion occurred over a period of 31 days. After hydration, most of the water could be driven off by heating the hydrated salt occluded zeolite to 530℃. However, some HCl forms during dehydration due to salt hydrolysis. Over a wide range of temperatures (320–700℃) and ramp rates (5, 10, and 20℃ min−1), HCl formation was no more than 0.6% of the Cl− in the original salt.