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  1. Article ; Online: The role of geometry precision in frequency-resonance method for non-destructive wood assessment – numerical case study on sugar maple

    Tippner, Jan / VojáČková, Barbora / Zlámal, Jan / Kolařĺk, Jaroslav / Paulic, Vinko / Funai, James

    Wood Material Science & Engineering. 2023 May 04, v. 18, no. 3 p.792-800

    2023  

    Abstract: The application of frequency-resonance method (FRM) for precise log bending testing is limited by complex geometry; usually the cone with variable cross. This case study presents the relationship among non-destructively tested material parameters of ... ...

    Abstract The application of frequency-resonance method (FRM) for precise log bending testing is limited by complex geometry; usually the cone with variable cross. This case study presents the relationship among non-destructively tested material parameters of sugar maples and the numerical analysis of effect of simplifications in FRM. Four standing stems were measured to find basic geometry parameters, 3D scanned for precise geometry description, tested by pulling test (PT) to obtain elastic parameters, and, finally, cut down to process the logs. Four logs were measured by stress wave propagation (SWP) using an acoustic tomography (AT) device to obtain longitudinal sound velocities and then evaluated by the FRM to obtain natural frequencies in bending and longitudinal vibrations. Comparison was made between the dynamic moduli of elasticity (MOE), calculated from SWP and the FRM, and the static MOE calculated from the PT. In-situ experimental evaluation was accompanied by modal analysis by finite element method (FEM) working at three levels of geometry simplification (beam model, simplified solid model, and scan-based solid model); the natural frequencies of bending and longitudinal mode shapes were analyzed. The influence of geometry precision on the resulting dynamic response of logs was found regarding comparison to the experimental values.
    Keywords Acer saccharum subsp. saccharum ; acoustics ; case studies ; finite element analysis ; geometry ; materials science ; models ; sugars ; tomography ; wood ; Non-destructive testing ; sugar maple ; sound propagation ; natural frequency ; finite element method ; modal analysis ; 3D scan ; cross section ; modulus of elasticity
    Language English
    Dates of publication 2023-0504
    Size p. 792-800.
    Publishing place Taylor & Francis
    Document type Article ; Online
    ISSN 1748-0280
    DOI 10.1080/17480272.2022.2071166
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Evaluation of Three Soil Blends to Improve Ornamental Plant Performance and Maintain Engineering Metrics in Bioremediating Rain Gardens

    Funai, James T / Petr Kupec

    Water, air, and soil pollution. 2019 Jan., v. 230, no. 1

    2019  

    Abstract: This research project explores the performance of soils intended to support ornamental plants serving an ecological benefit within bioremediating rain gardens. Three plots of identical plantings were installed in autumn of 2015 into three different ... ...

    Abstract This research project explores the performance of soils intended to support ornamental plants serving an ecological benefit within bioremediating rain gardens. Three plots of identical plantings were installed in autumn of 2015 into three different planting media in Northeast Ohio, USA. A control soil blend was tested against two experimental soil blends in the field under natural conditions for 3 years to explore any potential differences in overall plant performance. The control planting soil was created following current Ohio Department of Natural Resources specifications for rain garden planting soils which consist of no less than 80% sand and no more than 10% clay by volume. Test soil blends incorporated lightweight expanded shale to combat the potential negative effects of high sand soils for plants (i.e., high matric potential) while maintaining required engineering benefits (i.e., fast infiltration rate coupled with good physical, chemical, and biological filtration). Our analysis suggests that incorporating expanded shales into bioremediating gardens as a replacement to high sand content can maintain all engineering specifications and may increase survival rates of plant life beyond rates currently found in high sand content rain gardens. Survival rate for plants in the control plot was at 48.3% while experimental plots one and two were 96.5% and 75.8% respectively. The research team suggests that these increased survival rates could contribute to more widespread adoption and implementation of stormwater management practices, especially small-scale, interconnected rain gardens in the urban environment as designated by low-impact development standards.
    Keywords autumn ; biofiltration ; bioremediation ; bioretention areas ; clay ; engineering ; gardens ; infiltration rate ; ornamental plants ; planting ; sand ; sand fraction ; sandy soils ; shale ; survival rate ; urban areas ; Ohio
    Language English
    Dates of publication 2019-01
    Size p. 3.
    Publishing place Springer International Publishing
    Document type Article
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-018-4049-x
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 2719: Show issues

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  3. Article: Exploring Planting and Filter Media in Stormwater Bioremediating Landscapes: a Review

    Funai, JamesT / Petr Kupec

    Water, air, and soil pollution. 2017 Sept., v. 228, no. 9

    2017  

    Abstract: Filter media recommendations in stormwater bioremediation contain large ratios of sand. Ratios exceeding 75% by volume are supported by research into infiltration rates, physical filtration, reduced clogging, and leaching of nutrients from organics, ... ...

    Abstract Filter media recommendations in stormwater bioremediation contain large ratios of sand. Ratios exceeding 75% by volume are supported by research into infiltration rates, physical filtration, reduced clogging, and leaching of nutrients from organics, satisfying engineering specifications. Perhaps, high sand ratios are causing hostile soil ecosystems for a majority of common ornamental landscape plants which are not adapted to such sandy soils. Most sands have lower cation exchange capacities and lower adhesion holding plant available moisture than clay fractions. Clay, however, is not an ideal component in stormwater management due to small physical size and tendency to clog filters causing failure of engineered functions. A number of studies have addressed this issue by seeking plants that are suited to high sand content (thus adapted to low fertility and low plant available moisture). While these studies may provide plants suitable to such gardens, they may not address the need for gardens to appeal esthetically to the general public and remain familiar to the maintenance crews which must service these systems. By highlighting possible shortfalls of high sand content soil blends, this review exposes a need for research in plant performance as well as soil micro- and macro-faunal communities within bioremediation by addressing the whole ecosystem. The filter and planting media used in stormwater management gardens should improve floral and faunal health while maintaining engineered specifications and esthetic requirements. With improved ecosystem health and activity, these gardens could last longer, perform better, and cost less to maintain.
    Keywords adhesion ; aesthetics ; bioremediation ; cation exchange capacity ; clay fraction ; environmental health ; fauna ; filters ; filtration ; gardens ; infiltration rate ; leaching ; nutrients ; ornamental plants ; planting ; sand ; sand fraction ; sandy soils ; soil ecosystems ; stormwater ; stormwater management
    Language English
    Dates of publication 2017-09
    Size p. 340.
    Publishing place Springer International Publishing
    Document type Article
    ZDB-ID 120499-3
    ISSN 1573-2932 ; 0049-6979 ; 0043-1168
    ISSN (online) 1573-2932
    ISSN 0049-6979 ; 0043-1168
    DOI 10.1007/s11270-017-3524-0
    Database NAL-Catalogue (AGRICOLA)

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    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 2719: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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