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  • 1
    Online Resource
    Online Resource
    American Geophysical Union (AGU) ; 2013
    In:  Eos, Transactions American Geophysical Union Vol. 94, No. 23 ( 2013-06-04), p. 205-206
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 94, No. 23 ( 2013-06-04), p. 205-206
    Abstract: During the 2009–2010 school year, 40% of New York City (NYC) Earth science teachers were not certified to teach Earth science [ New York State Education Department (NYSED) , 2011]. This highlights a longstanding shortage of certified teachers, which persists today and prevents many schools from offering courses on the subject, thus diminishing student opportunities to study or embark on careers in Earth science. More generally, the paucity of qualified, effective science teachers hinders student achievement in science, technology, engineering, and mathematics (STEM), and research has consistently shown that improving the quality of teaching substantially increases achievement in STEM‐related fields [ National Science Board , 2007]. With only 36% of NYC 8th graders scoring at or above the basic level of proficiency in science and with even lower scores for African‐American and Hispanic students [ Livingston and Wirt , 2005], the need for more qualified science teachers is clear.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Issue
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2013
    detail.hit.zdb_id: 2118760-5
    detail.hit.zdb_id: 240154-X
    SSG: 16,13
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  • 2
    In: Minerals, MDPI AG, Vol. 12, No. 7 ( 2022-07-13), p. 882-
    Abstract: We utilized the Neoma™, a recently released MC-ICP-MS platform offered by ThermoFisher Scientific, to assess the behavior of the Lu-Yb-Hf system during laser ablation analyses of various zircon standards as well as solution-based analyses of the JMC-475 Hf standard doped with varying quantities of Yb and Lu. The primary goal of this work was to characterize the behavior of the Yb interference correction on the Neoma™ platform since this is one of the biggest issues in the Hf isotope analysis community and because the Neoma™ platform will supplant the Neptune™ series instrument. During laser ablation analysis, we found that the overall data quality scales proportionally with the total Hf signal intensity, with higher signal analyses producing extremely accurate (within 1 εHf unit) and precise (sub εHf unit within-run standard errors) data. At low Yb signals ( 〈 0.1 V 173Yb), we were not able to produce an accurate internal Yb mass bias factor. However, utilizing an empirical approach allows for the application of session-specific relationships between the Yb and Hf mass bias factors, determined by analysis of standards of varying Yb content, to produce accurate εHf values from zircons with higher Yb/Hf ratios even where the total Hf signal intensity is relatively low. Similar behavior was observed in the solution analyses. Lastly, while the behavior of the Yb interference correction on the Neoma™ platform appears comparable to the Neptune™ series MC-ICP-MS, further work will help refine the understanding of the controls on mass bias behavior, oxide formation, session-to-session stability, etc.
    Type of Medium: Online Resource
    ISSN: 2075-163X
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2655947-X
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