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  1. Article: Nonlinear Finite Element Model for Bending Analysis of Functionally-Graded Porous Circular/Annular Micro-Plates under Thermomechanical Loads Using Quasi-3D Reddy Third-Order Plate Theory.

    Kim, Jinseok / Nava, Enrique / Rakici, Semsi

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 9

    Abstract: A nonlinear finite element model for axisymmetric bending of micro circular/annular plates under thermal and mechanical loading was developed using quasi-3D Reddy third-order shear deformation theory. The developed finite element model accounts for a ... ...

    Abstract A nonlinear finite element model for axisymmetric bending of micro circular/annular plates under thermal and mechanical loading was developed using quasi-3D Reddy third-order shear deformation theory. The developed finite element model accounts for a variation of material constituents utilizing a power-law distribution of a two-constituent material, three different porosity distributions through plate thickness, and geometrical nonlinearity. The modified couple stress theory was utilized to account for the strain gradient effects using a single material length scale parameter. Three different types of porosity distributions that have the same overall volume fraction but different enhanced areas were considered as a form of cosine functions. The effects of the material and porosity distribution, microstructure-dependency, the geometric nonlinearity, and various boundary conditions on the bending response of functionally-graded porous axisymmetric microplates under thermomechanical loads were studied using the developed nonlinear finite element model.
    Language English
    Publishing date 2023-05-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16093505
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Quantification of Slip Band Distribution in Polycrystals: An Automated Fast Fourier Transform Decomposition Approach.

    León-Cázares, Fernando D / Rowlands, Bradley / Galindo-Nava, Enrique I

    Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada

    2023  Volume 29, Issue 2, Page(s) 580–595

    Abstract: Plastic deformation is accumulated in slip bands in a wide variety of engineering alloys. Multiple material and loading conditions impact their distribution and degree of slip localization, but these effects are rarely quantified. To tackle this, the ... ...

    Abstract Plastic deformation is accumulated in slip bands in a wide variety of engineering alloys. Multiple material and loading conditions impact their distribution and degree of slip localization, but these effects are rarely quantified. To tackle this, the current work introduces a fast Fourier transform (FFT) decomposition method and applies it to a tensile-loaded polycrystalline nickel-based superalloy imaged via high-resolution digital image correlation and electron backscatter diffraction. This approach identifies active slip planes over the FFT images of individual grains and performs inverse transforms such that slip band traces with shared orientations are isolated. This technique enabled the largest quantification of slip band spacings and in-plane strains to date, with a total of 6,557 slip bands detected. The results show that the slip band spacings increase with grain size, with no evident dependence on grain orientation and Schmid factor. Slip bands are found to develop similar spacings along different octahedral planes and continue to spread over larger regions of the grain as the resolved shear stress of the active slip system increases. The FFT decomposition technique, which could be employed with multiple microscopy techniques, will allow for much-needed large-scale quantitative studies of slip localization.
    Language English
    Publishing date 2023-09-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 1385710-1
    ISSN 1435-8115 ; 1431-9276
    ISSN (online) 1435-8115
    ISSN 1431-9276
    DOI 10.1093/micmic/ozad002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Consonant and vowel articulation accuracy in younger and middle-aged Spanish healthy adults.

    Moreno-Torres, Ignacio / Nava, Enrique

    PloS one

    2020  Volume 15, Issue 11, Page(s) e0242018

    Abstract: Children acquire vowels earlier than consonants, and the former are less vulnerable to speech disorders than the latter. This study explores the hypothesis that a similar contrast exists later in life and that consonants are more vulnerable to ageing ... ...

    Abstract Children acquire vowels earlier than consonants, and the former are less vulnerable to speech disorders than the latter. This study explores the hypothesis that a similar contrast exists later in life and that consonants are more vulnerable to ageing than vowels. Data was obtained with two experiments comparing the speech of Younger Adults (YAs) and Middle-aged Adults (MAs). In the first experiment an Automatic Speech Recognition (ASR) system was trained with a balanced corpus of 29 YAs and 27 MAs. The productions of each speaker were obtained in a Spanish language word (W) and non-word (NW) repetition task. The performance of the system was evaluated with the same corpus used for training using a cross validation approach. The ASR system recognized to a similar extent the Ws of both groups of speakers, but it was more successful with the NWs of the YAs than with those of the MAs. Detailed error analysis revealed that the MA speakers scored below the YA speakers for consonants and also for the place and manner of articulation features; the results were almost identical in both groups of speakers for vowels and for the voicing feature. In the second experiment a group of healthy native listeners was asked to recognize isolated syllables presented with background noise. The target speakers were one YA and one MA that had taken part in the first experiment. The results were consistent with those of the ASR experiment: the manner and place of articulation were better recognized, and vowels and voicing were worse recognized, in the YA speaker than in the MA speaker. We conclude that consonant articulation is more vulnerable to ageing than vowel articulation. Future studies should explore whether or not these early and selective changes in articulation accuracy might be caused by changes in speech perception skills (e.g., in auditory temporal processing).
    MeSH term(s) Adult ; Aging ; Auditory Perception ; Female ; Humans ; Male ; Middle Aged ; Phonetics ; Spain ; Speech ; Speech Perception ; Voice
    Language English
    Publishing date 2020-11-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0242018
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  4. Article ; Online: Radiomics in CT and MR imaging of the liver and pancreas: tools with potential for clinical application.

    Berbís, M Álvaro / Godino, Félix Paulano / Rodríguez-Comas, Júlia / Nava, Enrique / García-Figueiras, Roberto / Baleato-González, Sandra / Luna, Antonio

    Abdominal radiology (New York)

    2023  Volume 49, Issue 1, Page(s) 322–340

    Abstract: Radiomics allows the extraction of quantitative imaging features from clinical magnetic resonance imaging (MRI) and computerized tomography (CT) studies. The advantages of radiomics have primarily been exploited in oncological applications, including ... ...

    Abstract Radiomics allows the extraction of quantitative imaging features from clinical magnetic resonance imaging (MRI) and computerized tomography (CT) studies. The advantages of radiomics have primarily been exploited in oncological applications, including better characterization and staging of oncological lesions and prediction of patient outcomes and treatment response. The potential introduction of radiomics in the clinical setting requires the establishment of a standardized radiomics pipeline and a quality assurance program. Radiomics and texture analysis of the liver have improved the differentiation of hypervascular lesions such as adenomas, focal nodular hyperplasia, and hepatocellular carcinoma (HCC) during the arterial phase, and in the pretreatment determination of HCC prognostic factors (e.g., tumor grade, microvascular invasion, Ki-67 proliferation index). Radiomics of pancreatic CT and MR images has enhanced pancreatic ductal adenocarcinoma detection and its differentiation from pancreatic neuroendocrine tumors, mass-forming chronic pancreatitis, or autoimmune pancreatitis. Radiomics can further help to better characterize incidental pancreatic cystic lesions, accurately discriminating benign from malignant intrapancreatic mucinous neoplasms. Nonetheless, despite their encouraging results and exciting potential, these tools have yet to be implemented in the clinical setting. This non-systematic review will describe the essential steps in the implementation of the radiomics and feature extraction workflow from liver and pancreas CT and MRI studies for their potential clinical application. A succinct overview of reported radiomics applications in the liver and pancreas and the challenges and limitations of their implementation in the clinical setting is also discussed, concluding with a brief exploration of the future perspectives of radiomics in the gastroenterology field.
    MeSH term(s) Humans ; Carcinoma, Hepatocellular ; Liver Neoplasms/diagnostic imaging ; Radiomics ; Pancreas/diagnostic imaging ; Pancreas/pathology ; Tomography, X-Ray Computed/methods ; Pancreatic Neoplasms/diagnostic imaging ; Magnetic Resonance Imaging/methods ; Retrospective Studies
    Language English
    Publishing date 2023-10-27
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2839786-1
    ISSN 2366-0058 ; 2366-004X
    ISSN (online) 2366-0058
    ISSN 2366-004X
    DOI 10.1007/s00261-023-04071-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  5. Article ; Online: Role of artificial intelligence in multidisciplinary imaging diagnosis of gastrointestinal diseases.

    Berbís, M Alvaro / Aneiros-Fernández, José / Mendoza Olivares, F Javier / Nava, Enrique / Luna, Antonio

    World journal of gastroenterology

    2021  Volume 27, Issue 27, Page(s) 4395–4412

    Abstract: The use of artificial intelligence-based tools is regarded as a promising approach to increase clinical efficiency in diagnostic imaging, improve the interpretability of results, and support decision-making for the detection and prevention of diseases. ... ...

    Abstract The use of artificial intelligence-based tools is regarded as a promising approach to increase clinical efficiency in diagnostic imaging, improve the interpretability of results, and support decision-making for the detection and prevention of diseases. Radiology, endoscopy and pathology images are suitable for deep-learning analysis, potentially changing the way care is delivered in gastroenterology. The aim of this review is to examine the key aspects of different neural network architectures used for the evaluation of gastrointestinal conditions, by discussing how different models behave in critical tasks, such as lesion detection or characterization (
    MeSH term(s) Artificial Intelligence ; Diagnostic Imaging ; Gastroenterology ; Gastrointestinal Diseases/diagnostic imaging ; Humans ; Neural Networks, Computer
    Language English
    Publishing date 2021-06-16
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2185929-2
    ISSN 2219-2840 ; 1007-9327
    ISSN (online) 2219-2840
    ISSN 1007-9327
    DOI 10.3748/wjg.v27.i27.4395
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 6039: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
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  6. Article ; Online: Abscessed inguinal metastasis as an initial presentation of testicular cancer.

    Salazar-Mejía, Carlos Eduardo / González-Nava, Enrique

    The Pan African medical journal

    2018  Volume 31, Page(s) 83

    MeSH term(s) Abscess/pathology ; Humans ; Inguinal Canal/pathology ; Male ; Testicular Neoplasms/diagnosis ; Testicular Neoplasms/pathology ; Young Adult
    Language English
    Publishing date 2018-10-04
    Publishing country Uganda
    Document type Case Reports ; Journal Article
    ZDB-ID 2514347-5
    ISSN 1937-8688 ; 1937-8688
    ISSN (online) 1937-8688
    ISSN 1937-8688
    DOI 10.11604/pamj.2018.31.83.17049
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