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  1. AU="Perfect, Edmund"
  2. AU="Varadwaj, Pritish K"
  3. AU="Bachiller-Hernández, Jaime"
  4. AU="MarinBenito, C"
  5. AU="Proto, Alice"
  6. AU="Stojanovic, Jelena"
  7. AU="Vargas Zhang, Adrian"
  8. AU="Braine, Rebecca"
  9. AU="Santos, Christine Nicole S"
  10. AU="Severi, Kristen E"
  11. AU="Robotti, Marzia"
  12. AU="Kaspar, Charles W"
  13. AU="Wallach, E E"
  14. AU="Temnikov, P"
  15. AU="Gomez-Verjan, Juan Carlos"
  16. AU="Mayle, Francis E."
  17. AU="Rhoades, Elizabeth"
  18. AU="Riaz, Huma"
  19. AU="Eliseu, Gabriel"
  20. AU="Hill, Lori R"
  21. AU="Boppana, Suresh B"

Suchergebnis

Treffer 1 - 10 von insgesamt 36

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  1. Buch: Special issue soil fragmentation and seedbed characterization

    Perfect, Edmund

    (Soil & tillage research ; 64,1/2)

    2002  

    Titelvarianten Soil fragmentation and seedbed characterization
    Verfasserangabe guest ed.: Edmund Perfect
    Serientitel Soil & tillage research ; 64,1/2
    Überordnung
    Sprache Englisch
    Umfang VI, 172 S. : Ill., graph. Darst.
    Verlag Elsevier
    Erscheinungsort Amsterdam u.a.
    Erscheinungsland Niederlande
    Dokumenttyp Buch
    Bemerkung Z 3643 (64,1/2)
    HBZ-ID HT013249054
    Datenquelle Katalog ZB MED Ernährung, Umwelt, Agrar

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    Z 3643 (64,1/2) ausleihbar (Lesesaal) Freihandmagazin (U1)

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  2. Buch: Special issue: Structure and function of soil and soil cover in a changing world

    Martín, Miguel Angel / Martínez, Fernando San José / Perfect, Edmund / Lado, Marcos / Pachepsky, Yakov

    characterization and scaling

    (Geoderma ; Volume 287 (1 February 2017))

    2017  

    Verfasserangabe edited by Miguel Ángel Martin, Fernando San José Martínez, Edmund Perfect, Marcos Lado and Yakov Pachepsky
    Serientitel Geoderma ; Volume 287 (1 February 2017)
    Überordnung
    Sprache Englisch
    Umfang 116 Seiten, Illustrationen
    Verlag Elsevier
    Erscheinungsort Amsterdam
    Erscheinungsland Niederlande
    Dokumenttyp Buch
    HBZ-ID HT019205469
    Datenquelle Katalog ZB MED Ernährung, Umwelt, Agrar

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    SignaturLeihstatusStandort
    Z 2363 (287) ausleihbar (Lesesaal) Freihandmagazin (U1)

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  3. Artikel: Analysis of Spatially Distributed Fracture Attributes: Normalized Lacunarity Ratio

    Roy, Ankur / Perfect, Edmund / Mukerji, Tapan

    Journal of geophysical research. 2021 Feb., v. 126, no. 2

    2021  

    Abstract: Most fracture data analysis techniques for attributes such as dip and aperture, treat the attributes independently of their respective spatial locations. A power‐law cumulative frequency for fracture apertures, for example, tells us nothing about their ... ...

    Abstract Most fracture data analysis techniques for attributes such as dip and aperture, treat the attributes independently of their respective spatial locations. A power‐law cumulative frequency for fracture apertures, for example, tells us nothing about their spatial distribution. Lacunarity is a technique for analyzing multi‐scale binary and non‐binary data and is ideally suited for analysis that relates an attribute (e.g., aperture) to its spatial distribution. In a previous study, we showed that scale‐dependent heterogeneity of fracture spacing can be analyzed using lacunarity in order to identify whether fractures occur in clusters. To determine if such clusters contain the largest fractures that control fluid flow through a fracture network, it is imperative that size attribute data be integrated with information about fracture spacing. Here we introduce the novel concept of lacunarity ratio (LR), which is the lacunarity of a given non‐binary data set normalized to the lacunarity of its random counterpart. This technique can delineate the relationship between attributes and spatial clustering by determining scale‐dependent changes in persistence and anti‐persistence. LR is implemented to test if large fractures are statistically found within fracture clusters or if they are randomly distributed at a given scale of observation. The technique is then applied to five different data sets with spacing values together with aperture, length and dip values respectively. The LR‐technique thus developed can help in identifying the occurrence of large or steep fractures with respect to fracture clusters, which in turn, can help improve modeling strategies.
    Schlagwörter data collection ; geophysics ; research
    Sprache Englisch
    Erscheinungsverlauf 2021-02
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ISSN 2169-9313
    DOI 10.1029/2019JB018350
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel: Influence of living grass Roots and endophytic fungal hyphae on soil hydraulic properties

    Marcacci, Katelyn M. / Warren, Jeffrey M. / Perfect, Edmund / Labbé, Jesse L.

    Rhizosphere. 2022 June, v. 22

    2022  

    Abstract: Soil hydraulic properties are often estimated based on laboratory data or pedotransfer functions dependent on soil physical properties, which often do not consider potential impacts of soil roots or fungal hyphae. Here, we first review current knowledge ... ...

    Abstract Soil hydraulic properties are often estimated based on laboratory data or pedotransfer functions dependent on soil physical properties, which often do not consider potential impacts of soil roots or fungal hyphae. Here, we first review current knowledge of how these soil biotic components affect hydraulic properties, then we conducted laboratory experiments to specifically test if the presence of roots and mycorrhizal fungi had a significant effect on the hydraulic properties of two soils with contrasting textures: Flint sand and Hamblen silt loam. Soil cores were seeded with (Panicum virgatum) and grown in a greenhouse over three separate growth periods. The endophytic fungus Serendipita indica was injected as liquid inoculant into designated mycorrhizal cores. Saturated hydraulic conductivity (Ksat) measurements were made with a constant head permeameter, and soil water retention curves were obtained by the evaporation method, supplemented at the dry end for Hamblen silt loam with water activity meter data. Retention curve parameters were obtained by fitting the van Genuchten equation to the resulting measurements. Mean root volume ratios were higher in the mycorrhizal inoculated treatment than in the uninoculated treatment for both soils. For Flint sand, analysis of variance revealed that Ksat was reduced by the presence of roots as compared to bare soil. This was likely due to roots clogging soil pores. Results also indicated the presence of roots changed the shape of the water retention curve for Flint sand by increasing water content at saturation and by reducing the slope of the curve. These changes suggested roots created additional porosity and broadened the pore-size distribution. The presence of mycorrhizal fungi accentuated the root effects. The influence of roots and mycorrhizal fungi on hydraulic properties was less obvious for the Hamblen silt loam, as none of the treatments differed from each other at p < 0.05. The results highlight the necessity to consider the impact of root and fungal structures on models of soil hydraulic properties.
    Schlagwörter Panicum virgatum ; analysis of variance ; endophytes ; equations ; evaporation ; grasses ; greenhouses ; hyphae ; liquids ; permeameters ; porosity ; rhizosphere ; sand ; saturated hydraulic conductivity ; silt loam soils ; water activity ; water content
    Sprache Englisch
    Erscheinungsverlauf 2022-06
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ISSN 2452-2198
    DOI 10.1016/j.rhisph.2022.100510
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  5. Artikel: Forward prediction of early‐time spontaneous imbibition of water in unsaturated rock fractures

    Perfect, Edmund / Brabazon, Jared W. / Gates, Christopher H.

    Vadose zone journal. 2020, v. 19, no. 1

    2020  

    Abstract: Spontaneous imbibition is a capillary‐driven phenomenon in which a wetting fluid displaces a nonwetting fluid from voids without any increase in external pressure. This study compared forward predictions of early‐time displacement of air by water within ... ...

    Abstract Spontaneous imbibition is a capillary‐driven phenomenon in which a wetting fluid displaces a nonwetting fluid from voids without any increase in external pressure. This study compared forward predictions of early‐time displacement of air by water within Mode I fractures in 14 low‐porosity rock cores using a new fractal model with those based on an established parallel plate model. Spontaneous imbibition was measured using dynamic neutron radiography, along with independent determinations of equilibrium contact angle, fracture aperture width, and fracture surface fractal dimension, Dₛ. The predicted uptake curves generally agreed with the experimental data. However, both models overpredicted the height of the wetting front at any given time. This overprediction may be due to lateral losses of wetting fluid to the matrix by spontaneous imbibition through fracture surfaces. The predictions of the fractal model were consistently closer to the observed values than those of the parallel plate model, and for the best cases, their upper and lower confidence intervals bounded the data points. In 12 out of 14 cases, the RMSD for the fractal model was less than that for the parallel plate model. A paired t test indicated that, on average, the RMSD for the fractal model was significantly lower than that for the parallel plate model. This statistically improved prediction can be attributed to the retardation of predicted uptake achieved through the introduction of a fracture surface roughness parameter (i.e., Dₛ) in the fractal model.
    Schlagwörter air ; contact angle ; fractal dimensions ; imbibition ; models ; neutrons ; prediction ; radiography ; surface roughness ; t-test ; vadose zone
    Sprache Englisch
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 2088189-7
    ISSN 1539-1663
    ISSN 1539-1663
    DOI 10.1002/vzj2.20056
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  6. Artikel: Fractal dimension, lacunarity and succolarity analyses on CT images of reservoir rocks for permeability prediction

    Xia, Yuxuan / Cai, Jianchao / Perfect, Edmund / Wei, Wei / Zhang, Qi / Meng, Qingbang

    Elsevier B.V. Journal of hydrology. 2019 Dec., v. 579

    2019  

    Abstract: An explicit relationship between seepage properties and microscopic structure of porous media is being sought for the development of oil and gas resources. An effective method to accurately characterize and quantify the microscopic structure of porous ... ...

    Abstract An explicit relationship between seepage properties and microscopic structure of porous media is being sought for the development of oil and gas resources. An effective method to accurately characterize and quantify the microscopic structure of porous media is a key issue. Fractal geometry can take advantage of several physically-based parameters to analyze microstructures of reservoir rocks. In this study, three fractal structural parameters, fractal dimension, lacunarity and succolarity, were employed to characterize scale-invariant complexity, heterogeneity, and anisotropy of rock microstructures, respectively. Twelve three-dimensional digital cores of sandstone reservoir rocks were used to evaluate permeability in terms of fractal dimension, lacunarity and succolarity. The parameters were utilized to quantitatively characterize differences in core micro-structure and predict their effects on permeability. Due to the confounding influence of porosity, the fractal dimension was not an accurate predictor of the variation in permeability on its own. Instead, the results reveal that lacunarity and succolarity were better able to predict differences in structure and permeability. Succolarity, in particular, showed an exponential relationship with permeability, yielding a coefficient of determination of 0.940. Using a combination of fractal structural parameters in the place of pore-size distribution, can provide a better explanation of the relationship between fluid flow, and the heterogeneous structure and anisotropic physical properties of reservoir rocks.
    Schlagwörter anisotropy ; fractal dimensions ; geometry ; microstructure ; oils ; permeability ; porosity ; porous media ; prediction ; sandstone ; seepage
    Sprache Englisch
    Erscheinungsverlauf 2019-12
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 1473173-3
    ISSN 1879-2707 ; 0022-1694
    ISSN (online) 1879-2707
    ISSN 0022-1694
    DOI 10.1016/j.jhydrol.2019.124198
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  7. Buch ; Online: A geometrical aperture-width relationship for rock fractures

    Ghanbarian, Behzad / Perfect, Edmund / Liu, Hui-Hai

    2018  

    Abstract: The relationship between fracture aperture (maximum opening; dmax) and fracture width (w) has been the subject of debate over the past several decades. An empirical power law has been commonly applied to relate these two parameters. Its exponent (n) is ... ...

    Abstract The relationship between fracture aperture (maximum opening; dmax) and fracture width (w) has been the subject of debate over the past several decades. An empirical power law has been commonly applied to relate these two parameters. Its exponent (n) is generally determined by fitting the power-law function to experimental observations measured at various scales. Invoking concepts from fractal geometry we theoretically show, as a first- order approximation, that the fracture aperture should be a linear function of its width, meaning that n = 1. This finding is in agreement with the result of linear elastic fracture mechanics (LEFM) theory. We compare the model predictions with experimental observations available in the literature. This comparison generally supports a linear relationship between fracture aperture and fracture width, although there exists considerable scatter in the data. We also discuss the limitations of the proposed model, and its potential application to the prediction of flow and transport in fractures. Based on more than 170 experimental observations from the literature, we show that such a linear relationship, in combination with the cubic law, is able to scale flow rate with fracture aperture over ~14 orders of magnitude for variations in flow rate and ~5 orders of magnitude for variations in fracture width.
    Schlagwörter Physics - Geophysics ; Physics - Fluid Dynamics
    Thema/Rubrik (Code) 551
    Erscheinungsdatum 2018-07-03
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Artikel: Upscaling Capillary Pressure–Saturation Functions Using Different Reference Pressure Elevations

    Cheng, Chu-Lin / Cropper, S. Clark / Perfect, Edmund / McKay, Larry / Kang, Misun

    Vadose zone journal. 2017 Aug., v. 16, no. 8

    2017  

    Abstract: CORE IDEAS: The BC‐vG Upscaler predicts the drainage of porous media of different heights. The default reference pressure elevation (RPE) is the middle of the porous medium. Predicted drainage functions deviate from observed functions as height increases. ...

    Abstract CORE IDEAS: The BC‐vG Upscaler predicts the drainage of porous media of different heights. The default reference pressure elevation (RPE) is the middle of the porous medium. Predicted drainage functions deviate from observed functions as height increases. A top RPE improves accuracy of predicted drainage functions regardless of height. Choice of reference pressure elevation (RPE) on average effective saturation–capillary pressure functions, 〈〉(ψ), was investigated for monotonic drainage of homogeneous porous media. Nine columns of Flint sand with heights ranging from 4.3 to 55.0 cm were prepared. Measured 〈〉(ψ) functions were determined gravimetrically using the hanging water column method. Predicted 〈〉(ψ) functions were obtained by upscaling point function parameters determined by neutron radiographic imaging of a single drainage experiment. Bottom and midpoint RPEs resulted in the inaccurate parameterization of 〈〉(ψ) functions for tall columns. A top RPE produced accurate upscaled functions for all column heights. To evaluate the overall performance of this RPE, observed effective saturations for the nine columns were linearly regressed against predicted values. The resulting best‐fit model (slope = 0.98; intercept = 0.03; R² = 0.98) corresponded closely to a 1:1 line. The van Genuchten (vG) α and n parameters for the observed and predicted 〈〉(ψ) functions decreased with increasing column height. A power model explained >95% of the variance in the predicted vG parameters and between 69 and 78% of the variance in the observed vG parameters. The lower R² values for the observed parameter models were attributed to experimental variation among the nine columns, whereas the predicted parameter models were upscaled from a single column. Despite these differences, the magnitudes and height dependencies of the observed and predicted average vG parameters were similar. For tall columns, the RPE should be established at the top for drainage experiments and at the bottom for wetting experiments.
    Schlagwörter drainage ; models ; neutrons ; porous media ; radiography ; sand ; vadose zone ; variance
    Sprache Englisch
    Erscheinungsverlauf 2017-08
    Umfang p. 1-9.
    Erscheinungsort The Soil Science Society of America, Inc.
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE ; epub
    ZDB-ID 2088189-7
    ISSN 1539-1663
    ISSN 1539-1663
    DOI 10.2136/vzj2017.03.0054
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  9. Artikel: Push-pull tests for estimating effective porosity: expanded analytical solution and in situ application

    Paradis, Charles J / Hazen, Terry C / Istok, Jonathan D / McKay, Larry D / Perfect, Edmund

    Hydrogeology journal. 2018 Mar., v. 26, no. 2

    2018  

    Abstract: The analytical solution describing the one-dimensional displacement of the center of mass of a tracer during an injection, drift, and extraction test (push-pull test) was expanded to account for displacement during the injection phase. The solution was ... ...

    Titelübersetzung « Push-pull » tests pour estimer la porosité efficace: solution analytique étendue et application in situ Ensayos “push-pull” para estimar la porosidad efectiva: solución analítica expandida y su aplicación in situ 进行推拉试验估算有效孔隙度:扩展解析解决方案及现场应用 Testes “push-pull” para estimativa de porosidade efetiva: solução analítica expandida e aplicação in situ
    Abstract The analytical solution describing the one-dimensional displacement of the center of mass of a tracer during an injection, drift, and extraction test (push-pull test) was expanded to account for displacement during the injection phase. The solution was expanded to improve the in situ estimation of effective porosity. The truncated equation assumed displacement during the injection phase was negligible, which may theoretically lead to an underestimation of the true value of effective porosity. To experimentally compare the expanded and truncated equations, single-well push-pull tests were conducted across six test wells located in a shallow, unconfined aquifer comprised of unconsolidated and heterogeneous silty and clayey fill materials. The push-pull tests were conducted by injection of bromide tracer, followed by a non-pumping period, and subsequent extraction of groundwater. The values of effective porosity from the expanded equation (0.6–5.0%) were substantially greater than from the truncated equation (0.1–1.3%). The expanded and truncated equations were compared to data from previous push-pull studies in the literature and demonstrated that displacement during the injection phase may or may not be negligible, depending on the aquifer properties and the push-pull test parameters. The results presented here also demonstrated the spatial variability of effective porosity within a relatively small study site can be substantial, and the error-propagated uncertainty of effective porosity can be mitigated to a reasonable level (< ± 0.5%). The tests presented here are also the first that the authors are aware of that estimate, in situ, the effective porosity of fine-grained fill material.
    Schlagwörter aquifers ; bromides ; equations ; groundwater ; porosity ; uncertainty ; wells
    Sprache Englisch
    Erscheinungsverlauf 2018-03
    Umfang p. 381-393.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1227482-3
    ISSN 0941-2816 ; 1431-2174
    ISSN 0941-2816 ; 1431-2174
    DOI 10.1007/s10040-017-1672-3
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  10. Artikel ; Online: Generalized modeling of spontaneous imbibition based on Hagen-Poiseuille flow in tortuous capillaries with variably shaped apertures.

    Cai, Jianchao / Perfect, Edmund / Cheng, Chu-Lin / Hu, Xiangyun

    Langmuir : the ACS journal of surfaces and colloids

    2014  Band 30, Heft 18, Seite(n) 5142–5151

    Abstract: Spontaneous imbibition of wetting liquids in porous media is a ubiquitous natural phenomenon which has received much attention in a wide variety of fields over several decades. Many traditional and recently presented capillary-driven flow models are ... ...

    Abstract Spontaneous imbibition of wetting liquids in porous media is a ubiquitous natural phenomenon which has received much attention in a wide variety of fields over several decades. Many traditional and recently presented capillary-driven flow models are derived based on Hagen-Poiseuille (H-P) flow in cylindrical capillaries. However, some limitations of these models have motivated modifications by taking into account different geometrical factors. In this work, a more generalized spontaneous imbibition model is developed by considering the different sizes and shapes of pores, the tortuosity of imbibition streamlines in random porous media, and the initial wetting-phase saturation. The interrelationships of accumulated imbibition weight, imbibition rate and gas recovery and the properties of the porous media, wetting liquids, and their interactions are derived analytically. A theoretical analysis and comparison denote that the presented equations can generalize several traditional and newly developed models from the literature. The proposed model was evaluated using previously published data for spontaneous imbibition measured in various natural and engineered materials including different rock types, fibrous materials, and silica glass. The test results show that the generalized model can be used to characterize the spontaneous imbibition behavior of many different porous media and that pore shape cannot always be assumed to be cylindrical.
    Sprache Englisch
    Erscheinungsdatum 2014-05-13
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/la5007204
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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