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  1. Article: Review: Inelastic Constitutive Modeling: Polycrystalline Materials.

    Baig, Mirza / Owusu-Danquah, Josiah / Campbell, Anne A / Duffy, Stephen F

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 9

    Abstract: This article provides a literature review that details the development of inelastic constitutive modeling as it relates to polycrystalline materials. This review distinguishes between inelastic constitutive models that account for nonlinear behavior at ... ...

    Abstract This article provides a literature review that details the development of inelastic constitutive modeling as it relates to polycrystalline materials. This review distinguishes between inelastic constitutive models that account for nonlinear behavior at the microstructural level, time-independent classic plasticity models, and time-dependent unified models. Particular emphasis is placed on understanding the underlying theoretical framework for unified viscoplasticity models where creep and classical plasticity behavior are considered the result of applied boundary conditions instead of separable rates representing distinct physical mechanisms. This article establishes a clear understanding of the advantages of the unified approach to improve material modeling. This review also discusses recent topics in constitutive modeling that offer new techniques that bridge the gap between the microstructure and the continuum.
    Language English
    Publishing date 2023-05-06
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16093564
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Effects of ultrasound settings on temperature changes in NiTi implants.

    Tiell, Shaye M / Chennoju, Manaswini / Davis, Brian L / Owusu-Danquah, Josiah

    Medical engineering & physics

    2023  Volume 123, Page(s) 104081

    Abstract: Background: Shape memory alloys (SMAs) are well-known for their unique ability to undergo a shape change in response to a thermal stimulus. A frequently-used SMA for biomedical devices is NiTi, although its superelastic features tend to be emphasized ... ...

    Abstract Background: Shape memory alloys (SMAs) are well-known for their unique ability to undergo a shape change in response to a thermal stimulus. A frequently-used SMA for biomedical devices is NiTi, although its superelastic features tend to be emphasized more than the ability to change shape. Minimally invasive NiTi implants which can reconfigure or adjust their shape across several temperature points could provide desirable surgical outcomes. For decades, therapeutic ultrasound has been used medically as a non-invasive method for tissue thermal therapy. Ultrasound's ability to quickly raise temperatures, and transcutaneously activate shape changes in NiTi implants is a novel approach for eliciting the martensitic thermoelastic transformation.
    Methods: The purpose of this study was to investigate the features of therapeutic ultrasound that correspond with temperature changes in different NiTi specimens. For this purpose, ultrasound was applied to two NiTi specimens for two minutes each at varying low- and high-frequency and power settings using a Sonicator 740 and a Dynatron 150.
    Findings: The baseline temperature for all 32 trials was room temperature (23.0 ± 1.7°C). This study successfully increased the specimen temperature with the application of Sonicator 740 and Dynatron 150 therapeutic ultrasound machines (2.2 ± 2.4°C and 1.5 ± 1.15°C, respectively). From the statistical analyses of the experimental data, it was clear that there is a significant difference between low- and high-power settings on mean temperature change using the Dynatron 150 (ANCOVA; p = 0.013). Interpretation Of clinical relevance, NiTi implants can quickly and easily increase in temperature when applying therapeutic ultrasound. Ultrasound power causes temperature changes and should be accounted for when designing orthopedic implants for applications where dimensional changes are desirable.
    MeSH term(s) Temperature ; Prostheses and Implants ; Titanium
    Chemical Substances Titanium (D1JT611TNE)
    Language English
    Publishing date 2023-12-05
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1181080-4
    ISSN 1873-4030 ; 1350-4533
    ISSN (online) 1873-4030
    ISSN 1350-4533
    DOI 10.1016/j.medengphy.2023.104081
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 2231: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  3. Article ; Online: Assessing the biomechanical properties of nitinol staples in normal, osteopenic and osteoporotic bone models: A finite element analysis.

    Curenton, Tanetta L / Davis, Brian L / Darnley, James E / Weiner, Scott D / Owusu-Danquah, Josiah S

    Injury

    2021  Volume 52, Issue 10, Page(s) 2820–2826

    Abstract: Objective: Bone staples are internal fixation devices that are frequently used in the foot, ankle, and hand to provide stabilization. Fixation stability is vital after fusion or fracture surgeries to ensure proper bone healing. Patients undergoing ... ...

    Abstract Objective: Bone staples are internal fixation devices that are frequently used in the foot, ankle, and hand to provide stabilization. Fixation stability is vital after fusion or fracture surgeries to ensure proper bone healing. Patients undergoing surgeries that require fixation to keep bones aligned and stable may present with diminishing bone mechanical properties, and this may compromise the ability of the fixation hardware to maintain a stable construct. The purpose of this study was to investigate the mechanical performance of shape memory and superelastic nitinol bone staples with different bridge geometries in normal, osteopenic, and osteoporotic bone models. Contact forces and maximum principal stress and strain in the bone were recorded.
    Methods: Finite element simulations of a bone staple fixation procedure were performed to examine the initial and post-surgery contact force, as well as the maximum principal stress and strain of 15 mm bridge and 20 mm bridge staple-bone constructs.
    Results: Shape memory nitinol staples exhibited higher contact forces compared to superelastic nitinol staples. Nitinol bone staples with 20 mm bridge lengths displayed higher contact forces and lower stresses in all bone types, as well as lower strains in osteoporotic bone models compared to nitinol staples with a 15 mm bridge length.
    Conclusion: Nitinol bone staple constructs with 20 mm bridge length staples provide higher contact forces and display lower stresses in the bone than 15 mm bridge staple-bone constructs, which may be beneficial in bone with diminishing mechanical properties. Both superelastic and shape memory effect nitinol staples provide adequate compression and stress relief. However, if osteopenia is present, shape memory effect nitinol staples with a 20 mm bridge length may provide more stress relief and compression, if the bone anatomy allows.
    MeSH term(s) Alloys ; Biomechanical Phenomena ; Finite Element Analysis ; Humans ; Osteoporosis ; Sutures
    Chemical Substances Alloys ; nitinol (2EWL73IJ7F)
    Language English
    Publishing date 2021-08-08
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 218778-4
    ISSN 1879-0267 ; 0020-1383
    ISSN (online) 1879-0267
    ISSN 0020-1383
    DOI 10.1016/j.injury.2021.08.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 778: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MO 10: Show issues

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  4. Article ; Online: Reduced Bacterial Counts from a Sewage Treatment Plant but Increased Counts and Antibiotic Resistance in the Recipient Stream in Accra, Ghana-A Cross-Sectional Study.

    Adomako, Lady A B / Yirenya-Tawiah, Dzidzo / Nukpezah, Daniel / Abrahamya, Arpine / Labi, Appiah-Korang / Grigoryan, Ruzanna / Ahmed, Hawa / Owusu-Danquah, Josiah / Annang, Ted Yemoh / Banu, Regina A / Osei-Atweneboana, Mike Y / Timire, Collins / Tweya, Hanock / Ackon, Stephen E D / Nartey, Emmanuel / Zachariah, Rony

    Tropical medicine and infectious disease

    2021  Volume 6, Issue 2

    Abstract: Wastewater treatment plants receive sewage containing high concentrations of bacteria and antibiotics. We assessed bacterial counts and their antibiotic resistance patterns in water from (a) influents and effluents of the Legon sewage treatment plant ( ... ...

    Abstract Wastewater treatment plants receive sewage containing high concentrations of bacteria and antibiotics. We assessed bacterial counts and their antibiotic resistance patterns in water from (a) influents and effluents of the Legon sewage treatment plant (STP) in Accra, Ghana and (b) upstream, outfall, and downstream in the recipient Onyasia stream. We conducted a cross-sectional study of quality-controlled water testing (January-June 2018). In STP effluents, mean bacterial counts (colony-forming units/100 mL) had reduced
    Language English
    Publishing date 2021-05-14
    Publishing country Switzerland
    Document type Journal Article
    ISSN 2414-6366
    ISSN (online) 2414-6366
    DOI 10.3390/tropicalmed6020079
    Database MEDical Literature Analysis and Retrieval System OnLINE

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