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1,636 results on '"Yang, Zhi‑Gang"'

201. Association of myocardial fibrosis detected by late gadolinium-enhanced MRI with clinical outcomes in patients with diabetes: a systematic review and meta-analysis

Author

Yang, Zhi, primary, Xu, Rong, additional, Wang, Jia-rong, additional, Xu, Hua-yan, additional, Fu, Hang, additional, Xie, Ling-jun, additional, Yang, Meng-xi, additional, Zhang, Lu, additional, Wen, Ling-yi, additional, Liu, Hui, additional, Li, Hong, additional, Yang, Zhi-gang, additional, and Guo, Ying-kun, additional

Published
2022
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209. Association Between Heart Failure With Preserved Left Ventricular Ejection Fraction and Impaired Left Atrial Phasic Function in Hypertrophic Cardiomyopathy: Evaluation by Cardiac MRI Feature Tracking

Author

Shi, Rui, primary, Shi, Ke, additional, Huang, Shan, additional, Li, Xiang, additional, Xia, Chun‐Chao, additional, Li, Yuan, additional, He, Sen, additional, Li, Zhen‐Lin, additional, He, Yong, additional, Guo, Ying‐Kun, additional, and Yang, Zhi‐Gang, additional

Published
2021
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220. Impact of BMI on Left Atrial Strain and Abnormal Atrioventricular Interaction in Patients With Type 2 Diabetes Mellitus: A Cardiac Magnetic Resonance Feature Tracking Study

Author

Shen, Meng‐ting, primary, Guo, Ying‐kun, additional, Liu, Xi, additional, Ren, Yan, additional, Jiang, Li, additional, Xie, Lin‐jun, additional, Gao, Yue, additional, Zhang, Yi, additional, Deng, Ming‐yan, additional, Li, Yuan, additional, and Yang, Zhi‐gang, additional

Published
2021
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225. Inflammation in Remote Myocardium and Left Ventricular Remodeling After Acute Myocardial Infarction: A Pilot Study Using T2 Mapping

Author

Yang, Meng‐xi, primary, Shi, Ke, additional, Xu, Hua‐yan, additional, He, Yong, additional, Ma, Min, additional, Zhang, Lu, additional, Wang, Jun‐long, additional, Li, Xue‐sheng, additional, Fu, Chuan, additional, Li, Hong, additional, Zhou, Bin, additional, Zhou, Xiao‐yue, additional, Yang, Zhi, additional, Guo, Ying‐kun, additional, and Yang, Zhi‐gang, additional

Published
2021
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228. Vortex structures and aeroacoustic performance of the flow field of the pantograph

Author

Yang Zhi-gang, Tan Xiao-ming, Wu Xiao-long, Tan Xi-ming, and Zhang Jie

Subjects
Physics, Acoustics and Ultrasonics, Mechanical Engineering, Acoustics, Aerodynamics, Wake, Condensed Matter Physics, Vortex shedding, 01 natural sciences, 010305 fluids & plasmas, Vortex, Noise, Mechanics of Materials, 0103 physical sciences, Pantograph, Shroud, 010301 acoustics, Intensity (heat transfer)
Abstract

The object of study in this paper is the Faiveley CX-PG pantograph. We first used the large-eddy simulation (LES) model to simulate the surrounding fluctuating flow field. We then identified the vortex structures in the flow field of the pantograph via the Q criterion, and performed a Fourier transform on the fluctuating pressure. We finally used the Ffowcs Williams-Hawkings (FW-H) equation to predict the far-field radiation noise of the pantograph. Through these steps, we explored the vortex structures in the flow field of the pantograph, aeroacoustic performance of the pantograph's main components, and the relationship between them, and proposed corresponding acoustic optimization countermeasures. The results showed that the vortex structures in the flow field of the pantograph varied with time and had a certain periodicity, and that the sound source intensity of the pantograph was mainly distributed in the bottom frame, three insulators, balance beam, upper arm frame, and lower arm. The sound source energy of these components accounted for approximately 92% of the total energy; the influencing factors for the aerodynamic sound source intensity of the pantograph included the shedding positions and vorticities of the vortex structures as well as whether it was located in the wake of the vortex structures. The aerodynamic noise of the pantograph could be effectively controlled by adjusting the vortex shedding position, reducing the vorticities of the vortex structures, increasing the distance between the mutually interfering components, setting the diversion structure to control the discharge area of the vortex structures. The sound source energy of the bottom frame area accounted for more than 50% of the total energy; a settlement platform or shroud could be installed to effectively control the noise in the area, thereby effectively reducing the noise radiated by the pantograph. The simulation results in this paper were in good agreement with the wind tunnel test results and theoretical results, and can provide a reference for the optimal design of future acoustics for the pantograph.

Published
2018

229. Additional file 2 of Radiomic assessment as a method for predicting tumor mutation burden (TMB) of bladder cancer patients: a feasibility study

Author

Tang, Xin, Qian, Wen-lei, Yan, Wei-feng, Pang, Tong, Gong, You-ling, and Yang, Zhi-gang

Abstract

Additional file 2: Fig. S1. Kaplan-Meier curves showing the survival outcomes of all cases. A. Overall survival between patients with high and low TMB; B. Disease-free survival between patients with high and low TMB; C. Overall survival between patients of clustering group A and B; D. Disease-free survival between patients of clustering group A and B. TMB: Tumor mutation burden. Fig. S2. Correlation analysis among radiomic features sequentially selected by univariate Logistic regression (A), LASSO regression (B) and backward elimination regression (C). Each value represents the correlation coefficient between two radiomic features.

Published
2021
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232. Association Between Heart Failure With Preserved Left Ventricular Ejection Fraction and Impaired Left Atrial Phasic Function in Hypertrophic Cardiomyopathy: Evaluation by Cardiac MRI Feature Tracking.

Author

Shi, Rui, Shi, Ke, Huang, Shan, Li, Xiang, Xia, Chun‐Chao, Li, Yuan, He, Sen, Li, Zhen‐Lin, He, Yong, Guo, Ying‐Kun, and Yang, Zhi‐Gang

Abstract

Background: The majority of heart failure (HF) in hypertrophic cardiomyopathy (HCM) manifests as a phenotype with preserved left ventricular (LV) ejection fraction; however, the exact contribution of left atrial (LA) phasic function to HF with preserved ejection fraction (HFpEF) in HCM remains unresolved. Purpose: To define the association between LA function and HFpEF in HCM patients using cardiac magnetic resonance imaging (MRI) feature tracking. Study Type: Retrospective. Population: One hundred and fifty‐four HCM patients (HFpEF vs. non‐HF: 55 [34 females] vs. 99 [43 females]). Field Strength/Sequence: 3.0 T/balanced steady‐state free precession. Assessment: LA reservoir function (reservoir strain [εs], total ejection fraction [EF]), conduit function (conduit strain [εe], passive EF), booster‐pump function (booster strain [εa] and active EF), LA volume index, and LV global longitudinal strain (LV GLS) were evaluated in HCM patients. Statistical Tests: Chi‐square test, Student's t‐test, Mann–Whitney U test, multivariate linear regression, logistic regression, and net reclassification analysis were used. Two‐sided P < 0.05 was considered statistically significant. Results: No significant difference was found in LV GLS between the non‐HF and HFpEF group (−10.67 ± 3.14% vs. −10.14 ± 4.01%, P = 0.397), whereas the HFpEF group had more severely impaired LA phasic strain (εs: 27.40 [22.60, 35.80] vs. 18.15 [11.98, 25.90]; εe: 13.80 [9.20, 18.90] vs. 7.95 [4.30, 14.35]; εa: 13.50 [9.90, 17.10] vs. 7.90 [5.40, 14.15]). LA total EF (37.91 [29.54, 47.94] vs. 47.49 [39.18, 55.01]), passive EF (14.70 [7.41, 21.49] vs. 18.07 [9.32, 24.78]), and active EF (27.19 [17.79, 36.60] vs. 36.64 [26.63, 42.71]) were all significantly decreased in HFpEF patients compared with non‐HF patients. LA reservoir (β = 0.90 [0.85, 0.96]), conduit (β = 0.93 [0.87, 0.99]), and booster (β = 0.86 [0.78, 0.95]) strain were independently associated with HFpEF in HCM patients. The model including reservoir strain (Net Reclassification Index [NRI]: 0.260) or booster strain (NRI: 0.325) improved the reclassification of HFpEF based on LV GLS and minimum left atrial volume index (LAVImin). Data Conclusion: LA phasic function was severely impaired in HCM patients with HFpEF, whereas LV function was not further impaired compared with non‐HF patients. Level of Evidence: 4 Technical Efficacy: Stage 3 [ABSTRACT FROM AUTHOR]

Published
2022
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