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  1. Artikel ; Online: Clinical and vascular lesion characteristics of the patients with takayasu arteritis manifested firstly as acute myocardial infarction at onset

    Ruifang Liu / Fangxing Xu / Yujie Zhou / Dongmei Shi / Tongku Liu

    Heliyon, Vol 9, Iss 2, Pp e13099- (2023)

    2023  

    Abstract: Objective: To explore clinical and vascular lesion characteristics of the patients with Takayasu arteritis (TA) manifested firstly as acute myocardial infarction (AMI) at onset and to improve the diagnostic rate of TA. Methods: The clinical and ... ...

    Abstract Objective: To explore clinical and vascular lesion characteristics of the patients with Takayasu arteritis (TA) manifested firstly as acute myocardial infarction (AMI) at onset and to improve the diagnostic rate of TA. Methods: The clinical and angiographic data of six patients with TA manifested firstly as AMI at onset were retrospectively analyzed. Results: Of six patients (16–25 years old), 83.33% (five cases) was female, three patients had a history of hypertension and three patients did not have any medical history. One patient had intermittent effort chest tightness. On admission patients all presented with chest pain, dyspnea, hypotension, cardiogenic shock, abnormal electrocardiogram, and elevated cardiac troponin I. The vessel involvement was left coronary main trunk 83.33%, left anterior descending artery 33.33% and left circumflex branch 16.67%, right coronary artery 66.67%, subclavian artery 83.33%, and renal artery 50%. Five patients received the emergency PCI. One patient died of heart failure. During follow-up 3 patients received again PCI treatment. Conclusion: Clinical and vascular lesion characteristics of those patients were no discomfort before admission, and the suddenly typical manifestation of AMI. Severe stenosis or occlusion occurred in main coronary artery ostia and peripheral large artery. For the TA patients with hemodynamic instability the effectiveness of emergency PCI is positive.
    Schlagwörter Takayasu arteritis ; Acute myocardial infarction ; Artery vessel lesions ; characteristic ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Thema/Rubrik (Code) 610 ; 616
    Sprache Englisch
    Erscheinungsdatum 2023-02-01T00:00:00Z
    Verlag Elsevier
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel: Electromagnetic characteristics and microwave absorption properties of carbon-encapsulated cobalt nanoparticles in 2–18-GHz frequency range

    Zhang, Danfeng / Fangxing Xu / Jin Lin / Zhenda Yang / Min Zhang

    Carbon. 2014 Dec., v. 80

    2014  

    Abstract: Carbon-encapsulated cobalt nanoparticles (Co(C)) with a diameter of 10–50nm were synthesized by an arc discharge method. The inner crystal cobalt core was completely encapsulated by an outer carbon shell, which consisted of both amorphous carbon and ... ...

    Abstract Carbon-encapsulated cobalt nanoparticles (Co(C)) with a diameter of 10–50nm were synthesized by an arc discharge method. The inner crystal cobalt core was completely encapsulated by an outer carbon shell, which consisted of both amorphous carbon and 15–20 layers of graphite-like carbon. The electromagnetic characteristics of Co(C) embedded in paraffin at 10, 40, 50, 70, and 80wt.% (2, 10, 15, 29, and 41vol.%, respectively) at 2–18GHz were investigated. The distinctive core–shell microstructure of Co(C) and the carbon shells were mainly responsible for the high complex permittivity. The real part of complex permeability (μ) decreased and the imaginary part of μ remained small with increasing frequency, which revealed that good insulation between the metallic cobalt cores was achieved by carbon encapsulation. The major electromagnetic absorption mechanism was dielectric loss. The minimum calculated reflection loss (RL) was −52dB at 7.54GHz with 50wt.% Co(C) for a 3-mm Co(C)/paraffin composite. The measured RL of a Co(C)/epoxy coating with 40wt.% loading at 3mm showed good agreement with that of calculated RL. The electromagnetic property of Co(C) can be tailored through both control Co(C) concentrations and coating thickness.
    Schlagwörter absorption ; carbon ; coatings ; cobalt ; encapsulation ; insulating materials ; microstructure ; nanoparticles ; permeability
    Sprache Englisch
    Erscheinungsverlauf 2014-12
    Umfang p. 103-111.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2014.08.044
    Datenquelle NAL Katalog (AGRICOLA)

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