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  • Correlations between in situ denitrification activity and nir-gene abundances in pristine and impacted prairie streams 

    Graham, David W.; Trippett, Clare; Dodds, Walter K.; O'Brien, Jonathan M.; Banner, Eric B. K.; Head, Ian M.; Smith, Marilyn S.; Yang, Richard K.; Knapp, Charles W. (Elsevier, 2010-10)
    Denitrification is a process that reduces nitrogen levels in headwaters and other streams. We compared nirS and nirK abundances with the absolute rate of denitrification, the longitudinal coefficient of denitrification ...
  • Diffusion Coefficients of Water and Leachables in Methacrylate-based Crosslinked Polymers using Absorption Experiments 

    Parathasarathy, Ranganathan; Misra, Anil; Park, Anil; Park, Jonggu; Ye, Qiang; Spencer, Paulette (Springer Verlag, 2012-05)
    The diffusion of water into dentin adhesive polymers and leaching of unpolymerized monomer from the adhesive are linked to their mechanical softening and hydrolytic degradation. Therefore, diffusion coefficient data are ...
  • Physico-mechanical properties determination using microscale homotopic measurements: Application to sound and cariesaffected primary tooth dentin 

    Marangos, Orestes; Misra, Anil; Spencer, Paulette; Bohaty, Brenda; Katz, J. Lawrence (Elsevier, 2009-05)
    Microscale elastic moduli, composition and density have rarely been determined at the same location for biological materials. In this paper, we have performed homotopic measurements to determine the physico-mechanical ...
  • Implementing Project Delivery Process Improvements: Identification of Resistance Types and Frequencies 

    Lines, Brian C.; Perrenoud, Anthony J.; Sullivan, Kenneth T.; Kashiwagi, Dean T.; Pesek, Anthony (American Society of Civil Engineers, 2017-01)
    Owner organizations within the architecture, engineering, and construction (AEC) industry are presented with a wide variety of potential process-related improvements aimed at increasing project efficiency and performance. ...
  • Conventional and High-Strength Hooked Bars—Part 1: Anchorage Tests 

    Sperry, Jayne; Yasso, S.; Searle, Nathaniel; Derubeis, Michael; Darwin, David; O'Reilly, Matthew; Matamoros, Adolfo B.; Feldman, Lisa; Lepage, Andres; Lequesne, Rémy D.; Ajaam, Ali (American Concrete Institute, 2017-01-01)
    This paper presents the results of an experimental study on the anchorage strength of conventional and high-strength steel hooked bars. Three hundred and thirty-seven exterior beam-column joint specimens were tested with ...
  • Conventional and High-Strength Hooked Bars—Part 2: Data Analysis 

    Sperry, Jayne; Darwin, David; O'Reilly, Matthew; Lequesne, Rémy D.; Yasso, S.; Feldman, Lisa; Lepage, Andres (American Concrete Institute, 2017-01-01)
    Empirical equations are developed to characterize the anchorage strength of hooked bars. The equations are based on tests of 245 simulated beam-column joint specimens with two hooked bars: 146 with confining reinforcement ...
  • Effects of Story-by-Story Post-Tensioning on Multi-Story Buildings 

    Guo, Guohui; Joseph, Leonard M.; Darwin, David (American Concrete Institute, 2013)
    The effects of story-by-story horizontal post-tensioning (PT) on multi-story buildings are investigated using staged construction analyses. Analytical column-supported and wall-supported multi-story models are studied to ...
  • Effect of Corrosion Inhibitors on Concrete Pore Solution Composition and Corrosion Resistance 

    O'Reilly, Matthew; Darwin, David; Browning, JoAnn; Xing, Lihua; Locke, Carl E. Jr.; Virmani, Y. Paul (https://www.concrete.org/publications/acimaterialsjournal.aspx, 2013)
    Three commercially available corrosion inhibitors—calcium nitrite, a solution of amines and esters, and an alkenyl-substituted succinic acid salt—are evaluated in conjunction with conventional reinforcement in concrete ...
  • Effect of Slag Cement on Drying Shrinkage of Concrete 

    Yuan, Jiqiu; Lindquist, Will; Darwin, David; Browning, JoAnn (American Concrete Institute, 2015)
    The effect of a partial replacement of cement with slag cement on free shrinkage is evaluated for curing periods between 3 and 28 days. Mixtures include concrete containing different replacement levels of slag cement (30, ...
  • Defining Yield Strength for Nonprestressed Reinforcing Steel 

    Paulson, Conrad; Rautenberg, Jeffrey M.; Graham, Scott K.; Darwin, David (American Concrete Institute, 2016)
    Analytical strengths of reinforced concrete beams and columns based on reinforcing steel stress-strain curves with and without a sharp yield plateau and the nonlinear stress-strain behavior of concrete are compared with ...
  • Effect of Preexisting Cracks on Lap Splice Strength of Reinforcing Bars 

    Yuan, Jiqiu; Matamoros, Adolfo B.; Darwin, David (American Concrete Institute, 2016)
    The effect of preexisting subsurface cracks on the strength of lap splices was investigated. Ten full-scale beams with No. 11 (No. 36) bars and lap splice lengths of 33, 79, and 120 in. (838, 2007, and 3048 mm) were tested. ...
  • Effects of Deicers on Concrete Deterioration 

    Darwin, David; Browning, JoAnn; Gong, Lien; Hughes, Sean R. (American Concrete Institute, 2008)
    Concrete specimens were exposed to weekly cycles of wetting and drying in distilled water and in solutions of sodium chloride (NaCl), calcium chloride (CaCl2), magnesium chloride (MgCl2), and calcium magnesium acetate (CMA) ...
  • Critical Chloride Corrosion Threshold of Galvanized Reinforcing Bars 

    Darwin, David; Browning, JoAnn; O'Reilly, Matthew; Xing, Lihua; Ji, Jianxin (American Concrete Institute, 2009)
    The chloride content required for corrosion initiation of galvanized reinforcing bars is determined. The bars conform to ASTM A767, except that no chromate treatment was applied to allow the degree of hydrogen evolution ...
  • Lightweight Aggregate as Internal Curing Agent to Limit Concrete Skrinkage 

    Browning, JoAnn; Darwin, David; Reynolds, Diane; Pendergrass, Benjamin (American Concrete Institute, 2011)
    The effectiveness of prewetted, vacuum saturated (PVS) lightweight aggregate (LWA) as an internal curing agent to reduce concrete shrinkage is evaluated for curing periods of 7 and 14 days. Normalweight aggregate is replaced ...
  • High-resolution modeling of the spatial heterogeneity of soil moisture: Applications in network design 

    Chaney, Nathaniel W.; Roundy, Joshua K.; Herrera-Estrada, Julio; Wood, Eric F. (AGU, 2015-01-28)
    The spatial heterogeneity of soil moisture remains a persistent challenge in the design of in situ measurement networks, spatial downscaling of coarse estimates (e.g., satellite retrievals), and hydrologic modeling. To ...
  • Seasonal Forecasting of Global Hydrologic Extremes: System Development and Evaluation over GEWEX Basins 

    Yuan, Xing; Roundy, Joshua K.; Wood, Eric F.; Sheffield, Justin (AMERICAN METEOROLOGICAL SOCIETY, 2015-11)
    Seasonal hydrologic extremes in the form of droughts and wet spells have devastating impacts on human and natural systems. Improving understanding and predictive capability of hydrologic extremes, and facilitating adaptations ...
  • Determination of Load Equivalency for Unpaved Roads 

    Sun, Xiaohui; Han, Jie; Wayne, Mark H.; Parsons, Roberts L.; Kwon, Jayhyun (National Academy of Sciences, 2015)
    The load equivalency method is widely used to consider the effect of traffic loading on pavement design, and the equivalent axle load factor (EALF) for paved roads has been studied often. For unpaved roads, however, EALF ...
  • Influence of apparent wave velocity on seismic performance of a super-long-span triple-tower suspension bridge 

    Wang, Hao; Li, Jian; Tao, Tianyou; Wang, Chunfeng; Li, Aiqun (SAGE Publications, 2015-06-25)
    As one of the main characteristics of seismic waves, apparent wave velocity has great influence on seismic responses of long-span suspension bridges. Understanding these influences is important for seismic design. In this ...
  • CFSv2-Based Seasonal Hydroclimatic Forecasts over the Conterminous United States 

    Yuan, Xing; Wood, Eric F.; Roundy, Joshua K.; Pan, Ming (American Meteorological Society, 2013-01-02)
    There is a long history of debate on the usefulness of climate model–based seasonal hydroclimatic forecasts as compared to ensemble streamflow prediction (ESP). In this study, the authors use NCEP's operational forecast ...
  • CFSv2-Based Seasonal Hydroclimatic Forecasts over the Conterminous United States 

    Yuan, Xing; Wood, Eric F.; Roundy, Joshua K.; Pan, Ming (American Meteorological Society, 2013-07-03)

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