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- 저자 : Chunmiao Wang (검색결과 4 건)
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Chenying Lu,Zufei Wang,Jiansong Ji,Hailin Wang,Xianghua Hu,Chunmiao Chen 대한영상의학회 2015 Korean Journal of Radiology Vol.16 No.1
To assess the effect of chest circumference-adapted scanning protocol on radiation exposure and image quality in patients undergoing prospective electrocardiogram (ECG)-triggered coronary CT angiography (CCTA). One hundred-eighty-five consecutive patients, who had undergone prospective ECG triggering CCTA with a 128-slice CT, were included in the present study. Nipple-level chest circumference, body weight and height were measured before CT examinations. Patients were divided into four groups based on kV/ref∙mAs = 100/200, 100/250, 120/200, and 120/250, when patient’s chest circumference was ≤ 85.0 (n = 56), 85.0–90.0 (n = 53), 90.0–95.0 (n = 44), and > 95.0 (n = 32), respectively. Image quality per-segment was independently assessed by two experienced observers. Image noise and attenuation were also measured. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated. The effective radiation dose was calculated using CT dose volume index and the dose-length product. A significant correlation was observed between patients’ chest circumference and body mass index (r = 0.762, p < 0.001). Chest circumference ranged from 74 to 105 cm, and the mean effective radiation dose was 1.9–3.8 mSv. Diagnostic image quality was obtained in 98.5% (2440/2478) of all evaluated coronary segments without any significant differences among the four groups (p = 0.650). No significant difference in image noise was observed among the four groups (p = 0.439), thus supporting the validity of the chest circumference-adapted scanning protocol. However, vessel attenuation, SNR and CNR were significantly higher in the 100 kV groups than in the 120 kV groups (p < 0.05). A measure of chest circumference can be used to adapt tube voltage and current for individualized radiation dose control, with resultant similar image noise and sustained diagnostic image quality.
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Progress on fabrication and application of activated carbon sphere in recent decade
Jingming Lan,Baoying Wang,Chunmiao Bo,Bolin Gong,Junjie Ou 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Activated carbon (AC) has a long history as an adsorbent material in many applications, including heavymetal and toxic gas removal as well as air and water filter applications. Activated carbon sphere (ACS) is aspecial type of activated carbon that has a high compressive strength and low ash content. Coal, asphalt,resins, polymers, lignin, carbohydrates, etc. can be utilized as precursors to prepare ACS using simple carbonizationand activation processes. Various parameters such as carbonization temperature, rising rate oftemperature, activation time, activation temperature, activator, different activation methods, etc. havesignificant effects on the performance and quality of the final product. As the size of ACS decreases, differentpreparation methods were adopted to prepare nano-sized or micron-sized spherical activated carbon. However, regardless of the size and shape of spherical activated carbon, it has a wide range of rolesfor the removal of heavy metals, organic dyes, carbon dioxide, volatile organic chemicals, catalyst carriers,gas and energy storage, chemical protection materials, and blood purification. This article mainlyreviews preparation methods of ACS over the last decade, and its applications and the challenges facedby ACS are discussed.
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Effect of Ignition Position and Sample Thickness on Flame Spread in Flexible Polyurethane Foam
Qi Yuan,Chang Li,Paul Amyotte,Lingfeng Wang,Chunmiao Yuan,Gang Li,Weidong Yan 한국고분자학회 2022 폴리머 Vol.46 No.4
Fire behavior of flexible polyurethane foam (FPUF) at different sample thicknesses and ignition positioningwas investigated. Effects on flame height, mass loss rate and other parameters were tested, and the flame propagationmechanism was analyzed. A method for predicting equivalent combustion diameter (D) values of the dynamic changeof liquid pool at different positions is proposed. Combined with data of sample mass loss rate, flame height can be predicted. Based on a transition state model, a method for predicting the fire risk of FPUF in late stage combustion by calculating the generation time of polyols is proposed. With edge ignition, FPUF burning produces an inclined surfaceduring the combustion process which enhances the length of the preheating zone by means of heat conduction and heatradiation. Flame spread rate (FSV) in FPUF with edge ignition was greater than with center point ignition.
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