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  • 1
    Online-Ressource
    Online-Ressource
    Navigating an Academic Career : a Brief Guide for PhD Students, Postdocs, and New Faculty. (2019)
    Newark :American Geophysical Union,
    Details
    Schlagwort(e): Career development. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (96 pages)
    Ausgabe: 1st ed.
    ISBN: 9781119642213
    Serie: Special Publications ; v.74
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=5986746
    Sprache: Englisch
    Anmerkung: Cover -- Title Page -- Copyright Page -- Contents -- Preface -- About the Author -- Part I: The PhD Studentand Postdoc Years -- Chapter 1 An Academic Career -- Chapter 2 Traits of Successful Scientists -- Chapter 3 Avoiding a PhD in Anxiety -- Chapter 4 Getting Your First Academic Job -- Chapter 5 The Academic Matthew Effect -- Part II: Surviving and Thriving in the First Few Years -- Chapter 6 Paper Writing Gone Hollywood -- Chapter 7 The Perfect Department -- Chapter 8 Ethics in the Real World -- Chapter 9 Research Brand Identity -- Chapter 10 The 1-Hour Workday -- Chapter 11 Orchestrating a Powerful Research Group -- Chapter 12 Proposal Writing Hacks -- Part III: Tenure and Beyond -- Chapter 13 Mentoring the Middle -- Chapter 14 Research Visits and Academic Growth Spurts -- Chapter 15 On Leadership -- Chapter 16 The Sustainable Professor -- Chapter 17 A Scientist Looks at 60 -- Postface -- Acknowledgments -- Notes -- Further Reading -- Index -- The author -- EULA.
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  • 2
    Digitale Medien
    Digitale Medien
    The Geochemical Evolution of Riparian Ground Water in a Forested Piedmont Catchment (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 41 (2003), S. 0 
    Details
    ISSN: 1745-6584
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik , Geologie und Paläontologie
    Notizen: The principal weathering reactions and their rates in riparian ground water were determined at the Panola Mountain Research Watershed (PMRW) near Atlanta, Georgia. Concentrations of major solutes were measured in ground water samples from 19 shallow wells completed in the riparian (saprolite) aquifer and in one borehole completed in granite, and the apparent age of each sample was calculated from chloroflourocarbons and tritium/helium-3 data. Concentrations of SiO2, Na+, and Ca2+ generally increased downvalley and were highest in the borehole near the watershed outlet. Strong positive correlations were found between the concentrations of these solutes and the apparent age of ground water that was modern (zero to one year) in the headwaters, six to seven years midway down the valley, and 26 to 27 years in the borehole, located ∼500 m downstream from the headwaters. Mass-balance modeling of chemical evolution showed that the downstream changes in ground water chemistry could be largely explained by weathering of plagioclase to kaolinite, with possible contributions from weathering of K-feldspar, biotite, hornblende, and calcite. The in situ rates of weathering reactions were estimated by combining the ground water age dates with geochemical mass-balance modeling results. The weathering rate was highest for plagioclase (∼6.4 μmol/L/year), but could not be easily compared with most other published results for feldspar weathering at PMRW and elsewhere because the mineral-surface area to which ground water was exposed during geochemical evolution could not be estimated. However, a preliminary estimate of the mineral-surface area that would have contacted the ground water to provide the observed solute concentrations suggests that the plagioclase weathering rate calculated in this study is similar to the rate calculated in a previous study at PMRW, and three to four orders of magnitude slower than those published in previous laboratory studies of feldspar weathering. An accurate model of the geochemical evolution of riparian ground water is necessary to accurately model the geochemical evolution of stream water at PMRW.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1745-6584.2003.tb02434.x
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  • 3
    Digitale Medien
    Digitale Medien
    Shallow Water Table Fluctuations in Relation to Soil Penetration Resistance (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 41 (2003), S. 0 
    Details
    ISSN: 1745-6584
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik , Geologie und Paläontologie
    Notizen: Hydrologic modeling of catchments is frequently hampered by lack of information on subsurface stratigraphy and zones of preferred flow. We evaluated the usefulness of soil penetration resistance, easily measured by a dynamic cone penetrometer, together with measurements of ground water level fluctuations, as a cost-effective means to infer subsurface flow patterns. At our field site at Sleepers River, Vermont, penetration resistance was lowest in the surfi-cial 10 to 30 cm, then typically increased to a local maximum at 60 to 80 cm, which we interpreted as the soil/till interface. Below this depth usually lies a zone of decreased resistance in the till, giving way to either a gradual or abrupt increase in resistance toward the bedrock surface at 1 to 4.5 m depth. Penetration resistance had a weak but significant negative correlation with saturated hydraulic conductivity determined by bail tests (r2= 0.25, p 〈 0.05). At many wells, monthly ground water levels tended to cluster at or just above the resistant zone near the soil/till interface. Chemical and isotopic dynamics in nested wells finished above and below the resistant zone suggest that the zone may temporarily isolate the deeper ground water reservoir from meltwater inputs, which were clearly identified by low δ18O values. In ground water discharge zones, δ18O values tended to converge throughout the profile. In contrast, dissolved organic carbon (DOC) maintained a gradient of increasing concentration toward land surface, even in otherwise well-mixed waters, reflecting its rapid release from organic horizons. Understanding the effect of soil penetration resistance on ground water behavior may be useful in future catchment modeling efforts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1745-6584.2003.tb02438.x
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  • 4
    Digitale Medien
    Digitale Medien
    Nitrogen solutes in an Adirondack forested watershed: Importance of dissolved organic nitrogen (2000)
    Springer
    Biogeochemistry 48 (2000), S. 165-184 
    Details
    ISSN: 1573-515X
    Schlagwort(e): Adirondack Mountains ; total organic nitrogen ; hydrology ; nitrogen retention ; nitrogen saturation ; watershed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Notizen: Abstract Nitrogen (N) dynamics were evaluated from 1 June 1995 through 31 May 1996 within the Arbutus Lake watershed in the Adirondack Mountains of New York State, USA. At the Arbutus Lake outlet dissolved organic nitrogen (DON), NO3 - and NH4 + contributed 61%, 33%, and 6% respectively, to the total dissolved nitrogen (TDN) flux (259 mol ha-1 yr-1). At the lake inlet DON, NO3 -, and NH4 - constituted 36%, 61%, and 3% respectively, of TDN flux (349 mol ha-1 yr-1). Differences between the factors that control DON, NO3 +, and NH4 + stream water concentrations were evaluated using two methods for estimating annual N flux at the lake inlet. Using biweekly sampling NO3 - and NH4 + flux was 10 and 4 mol ha-1 yr-1 respectively, less than flux estimates using biweekly plus storm and snowmelt sampling. DON flux was 18 mol ha-1 yr-1 greater using only biweekly sampling. These differences are probably not of ecological significance relative to the total flux of N from the watershed (349 mol ha-1 yr-1). Dissolved organic N concentrations were positively related to discharge during both the dormant (R2 = 0.31; P 〈 0.01) and growing season (R2 = 0.09; P 〈 0.01). There was no significant relationship between NO3 - concentration and discharge during the dormant season, but a significant negative relationship was found during the growing season (R2 = 0.29; P 〈 0.01). Biotic controls in the growing season appeared to have had a larger impact on stream water NO3 - concentrations than on DON concentrations. Arbutus Lake had a major impact on stream water N concentrations of the four landscape positions sampled, suggesting the need to quantify within lake processes to interpret N solute losses and patterns in watershed-lake systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006121828108
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