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13 results on '"Wang, Yurong"'

2. Performance and Loss Analysis of a Small-Scale Supercritical CO2 Turbine.

Author

Tian, Hua, Lin, Xin, Li, Ligeng, Zeng, Xianyu, Wang, Yurong, Shi, Lingfeng, Wang, Xuan, Liang, Xingyu, and Shu, Gequn

Subjects
TURBINES, SUPERCRITICAL carbon dioxide, FLOW separation
Abstract

The supercritical carbon dioxide (S-CO2) power cycle is widely applicable to the utilization of multigrade heat sources due to its high efficiency and compact structure, in which the turbine is critical to the performance of the system. In this study, the operation pattern and output performance of an S-CO2 axial turbine with a design power scale of 10 kW power are investigated by experiments and numerical simulations. The loss mechanisms and distributions are analyzed using numerical simulations and loss models. The results show that the turbine output power and efficiency are at 9.66 kW and 36.6% at the designed condition and the output performance depends on the pressure ratio and rational speed. In addition, the flow field distribution reveals that the flow separation phenomenon occurs leading to loss, with the tip clearance loss being the most significant. Furthermore, the loss model validated in this paper is proven to be competent enough to fulfill the prediction of the loss distribution under different operational conditions, which could be very promising in the design of an S-CO2 axial turbine. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Serum 25-Hydroxyvitamin D3 Levels Are Associated with Carotid Intima-Media Thickness and Carotid Atherosclerotic Plaque in Type 2 Diabetic Patients

Author

Wang, Yurong and Zhang, Huijuan

Subjects
Blood Glucose, Carotid Artery Diseases, Male, Pathology, Endocrinology, Diabetes and Metabolism, Blood lipids, 030204 cardiovascular system & hematology, lcsh:Diseases of the endocrine glands. Clinical endocrinology, Carotid Intima-Media Thickness, Gastroenterology, chemistry.chemical_compound, 0302 clinical medicine, Endocrinology, Chromatography, High Pressure Liquid, Middle Aged, Plaque, Atherosclerotic, Quartile, Parathyroid Hormone, cardiovascular system, Female, Research Article, Adult, Dorsal Raphe Nucleus, medicine.medical_specialty, Article Subject, Osteocalcin, 030209 endocrinology & metabolism, 03 medical and health sciences, Internal medicine, Diabetes mellitus, medicine, Vitamin D and neurology, Humans, cardiovascular diseases, Triglycerides, Calcifediol, Glycated Hemoglobin, lcsh:RC648-665, business.industry, Cholesterol, Cholesterol, HDL, Type 2 Diabetes Mellitus, Cholesterol, LDL, medicine.disease, Uric Acid, Logistic Models, Diabetes Mellitus, Type 2, Intima-media thickness, chemistry, Calcium, Hemoglobin, business
Abstract

Objective.To investigate the relationship between serum 25-hydroxyvitamin D3 [25(OH)D3] levels and carotid intima-media thickness (IMT) as well as carotid atherosclerotic plaque in patients with type 2 diabetes mellitus (T2DM).Methods.314 patients with T2DM were enrolled in this study. The clinical data and laboratory examinations of subjects were recorded, such as serum 25(OH)D3, hemoglobin A1c (HbA1c), serum lipids, fasting blood glucose (FBG), and other biochemical parameters. Color Doppler ultrasound was used to measure carotid IMT and carotid atherosclerotic plaques. Patients were divided into four quartile groups according to the serum 25(OH)D3 levels from low to high: group Q1~group Q4.Results.From group Q1 to group Q4, carotid IMT and the incidence of plaque were gradually reduced. Serum 25(OH)D3 levels were lower in the plaque group compared with the nonplaque group (P<0.01). Serum 25(OH)D3 levels were negatively correlated with the carotid IMT (r=−0.4,P<0.01). Multiple linear stepwise regression analysis showed that serum 25(OH)D3 was independently associated with carotid IMT (β=−0.009,P<0.01). Logistic regression analysis showed that serum 25(OH)D3 levels were independently associated with the presence of carotid plaque in T2DM (OR = 0.95; 95%CI: 0.92~0.98,P=0.004).Conclusions.Low vitamin D status may contribute to the incidence of carotid atherosclerosis in type 2 diabetic patients.

Published
2017

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