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  • Hindawi Limited  (4)
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  • Hindawi Limited  (4)
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  • 1
    Online Resource
    Online Resource
    The Role of Rossby-Wave Propagation in a North American Extreme Cold Event
    Hindawi Limited ; 2017
    In:  Advances in Meteorology Vol. 2017 ( 2017), p. 1-10
    Details
    In: Advances in Meteorology, Hindawi Limited, Vol. 2017 ( 2017), p. 1-10
    Abstract: The Eliassen–Palm flux and Plumb wave activity flux are calculated using the European Centre for Medium-Range Weather Forecasts interim reanalysis daily dataset to determine the propagation of Rossby waves before a North American cold wave in January 2014. The results show that the upward wave activity fluxes mainly come from planetary waves 1 and 2, which provide a stable circulation background for the influence of the subplanetary-scale waves 3 and 4. The Rossby-wave propagation anomalies between the troposphere and the stratosphere are due to the modulating effects of waves 3 and 4 on waves 1 and 2. During 9–14 January 2014, the modulating effects helped strengthen upward and eastward wave activity fluxes over the Atlantic region and enhance the Pacific high in the stratosphere in its early stage. Later in 19–24 January, the downward wave activity fluxes over the east Pacific due to the modulating effects were beneficial to downward development of the stratospheric high over the Pacific and the formation of a blocking high over the west coast of North America in the troposphere accompanied by a strong adjacent cold low on the east side. These circulations benefit the southward invasion of polar cold air reaching the lower latitudes of east North America, leading to the cold wave outbreak.
    Type of Medium: Online Resource
    ISSN: 1687-9309 , 1687-9317
    URL: Article
    DOI: 10.1155/2017/4635849
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2017
    detail.hit.zdb_id: 2486777-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Design and Optimization of a Triangular Shear Piezoelectric Acceleration Sensor for Microseismic Monitoring
    Hindawi Limited ; 2022
    In:  Geofluids Vol. 2022 ( 2022-4-25), p. 1-15
    Details
    In: Geofluids, Hindawi Limited, Vol. 2022 ( 2022-4-25), p. 1-15
    Abstract: Aiming at the characteristics of low sensitivity and narrow frequency range of existing microseismic monitoring sensors for mine water hazard prevention and control, a piezoelectric acceleration sensor for microseismic monitoring based on a kind of triangular shear structure is proposed. Firstly, the structure of the triangular shear piezoelectric acceleration sensor is designed, and its dynamic model is built. The structural and material parameters related to natural frequency and sensitivity are analyzed. Then, the selection of piezoelectric ceramic materials is discussed. The parametric design of the designed sensor is carried out, and its finite element structural model is built by ANSYS. The modal analysis, resonance response analysis, and piezoelectric analysis of the designed sensor are carried out. The simulation results indicate that the working frequency and sensitivity of the designed sensor meet the requirements of microseismic monitoring. Response surface optimization is adopted to analyze the influence of sensor element design variables on the sensitivity and resonant frequency of the designed sensor. The reoptimized design of the reference sensor improves the resonant frequency of the designed sensor by 9.46% and the charge sensitivity by 18.96%. Finally, the designed sensor is calibrated, and the microseismic signal detection experiment is carried out. The results indicate that the resonant frequency of the designed sensor is 6150 Hz, the working frequency is 0.1-2050 Hz, and the charge sensitivity is 1600 pC/g. The sensor can detect microseismic signals with a wide frequency range and high sensitivity.
    Type of Medium: Online Resource
    ISSN: 1468-8123 , 1468-8115
    URL: Article
    DOI: 10.1155/2022/3964502
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2045012-6
    SSG: 13
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Renin-angiotensin system gene polymorphisms in children with Henoch—Schönlein purpura in West China
    Hindawi Limited ; 2010
    In:  Journal of the Renin-Angiotensin-Aldosterone System Vol. 11, No. 4 ( 2010-12), p. 248-255
    Details
    In: Journal of the Renin-Angiotensin-Aldosterone System, Hindawi Limited, Vol. 11, No. 4 ( 2010-12), p. 248-255
    Abstract: It has been suggested that renin-angiotensin system (RAS) gene polymorphism is involved in the pathogenesis of Henoch—Schönlein purpura (HSP) with conflicting reports. We therefore investigate the effect of RAS gene polymorphism on HSP susceptibility and severity in a Chinese cohort. The study included 142 children with HSP and 218 healthy controls that were genotyped for RAS gene polymorphisms. Significantly, differences of T174M-T and ACE-D frequency were found between HSP patients and controls ( p alleo = .002, OR alleo = 2.001; p alleo = .007, OR alleo = 1.533, respectively). We also found correlations between ACE-I/D and Agt T174M with multiple organ involvements, with significant differences in ACE-D in renal groups ( p 〈 0.05) and Agt T174M in non-renal ( p joint = .002, p GI = .042). Furthermore, decreasing M235T-T and increasing ACE-D were found associated with serious renal complications ( p = .019, p = .016). Additionally, ACE-I/D and T174M were significantly associated with high clinical score patients, as opposed to low clinical score patients, when patients were scored depending on the severity of overall complications ( p = .045, p = .026). We suggest that RAS gene polymorphisms ( ACE-I/D, M235T or T174M) are significantly associated with susceptibility to HSP, organ involvement, and disease severity, which largely account for individual prognosis.
    Type of Medium: Online Resource
    ISSN: 1470-3203 , 1752-8976
    URL: Article
    DOI: 10.1177/1470320310374214
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2010
    detail.hit.zdb_id: 2261873-9
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  • 4
    Online Resource
    Online Resource
    Nomogram for Predicting Long-Term Survival after Synchronous Resection for Hepatocellular Carcinoma and Inferior Vena Cava Tumor Thrombosis: A Multicenter Retrospective Study
    Hindawi Limited ; 2020
    In:  Journal of Oncology Vol. 2020 ( 2020-04-08), p. 1-10
    Details
    In: Journal of Oncology, Hindawi Limited, Vol. 2020 ( 2020-04-08), p. 1-10
    Abstract: Background . Although surgery for hepatocellular carcinoma (HCC) complicated with inferior vena cava tumor thrombus (IVCTT) may improve survival for some patients, prognostic markers remain elusive because of its rarity. We constructed a prognostic nomogram which predicts individualized survival benefit of curative-intent surgery for HCC patients with IVCTT. Methods . According to abdominothoracic anatomy of inferior vena cava (IVC), IVCTT can be divided into 3 types: inferior diaphragmic (ID), superior diaphragmic (SD), and intracardiac type (IC). Data of 64 HCC patients with IVCTT who underwent curative-intent surgery between 2008 and 2015 in four centers in China were analyzed retrospectively. Univariate and multivariate Cox regression analyses were conducted to select variables for the construction of a prognostic nomogram. Predictive accuracy and discriminative ability were examined by concordance index (C-index) and calibration curve. Results . Of 64 patients in the IVCTT classification, 37 (57.8%) were classified as ID type, 15 (23.4%) as SD type, and 12 (18.8%) as IC type. The 1-, 2-, 3-, and 5-year disease-specific survival (DSS) rates for patients in ID, SD, and IC groups were 94.4%, 55.6%, 71.4%, and 30.0%; 27.8%, 21.4%, 7.1%, and 0%; and 8.3%, 0%, 0%, and 0%, respectively. Independent factors included in the nomogram were ECOG performance status, AFP level ≥ 400  μ g/L, tumor size ≥ 10 cm, portal vein tumor thrombosis, and IVCTT classification. The C-index of the nomogram was 0.812 (95% CI 0.761–0.873). The calibration plot for DSS probability showed excellent agreement between the prediction by nomogram and actual observation. Conclusions . Curative-intent surgery should be carefully evaluated and suggested according to our novel IVCTT classification. We have developed a visual web-based nomogram model to predict oncological prognosis of curative-intent surgery for HCC patients with IVCTT.
    Type of Medium: Online Resource
    ISSN: 1687-8450 , 1687-8469
    URL: Article
    DOI: 10.1155/2020/3264079
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2461349-6
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