http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
리그닌 쉬프 염기-구리 복합체의 합성 및 메틸렌 블루와 4-니트로페놀 제거를 위한 촉매 응용
진건송 ( Jiansong Chen ),허지원 ( Ji Won Heo ),김지우 ( Ji Woo Kim ),장즈리 ( Zhili Zhang ),김민수 ( Min Soo Kim ),김용식 ( Yong Sik Kim ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
Recently, the fabrication of biopolymer-based catalysts has been considered due to the advantages of biodegradability, highly efficiency, low cost and so on. In this work, novel catalyst lignin Schiff base-copper complex (L-SB-Cu) was synthesized and it was used for methylene blue (MB) and 4-nitrophenol (4-NP) removal in aqueous solutions. The catalyst was synthesized successfully and it was characterized by elemental analysis, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), gel permeation chromatography (GPC), proton nuclear magnetic resonance (<sup>1</sup>H NMR), carbon-13 nuclear magnetic resonance (<sup>13</sup>C NMR), and elemental mapping. The L-SB-Cu catalyst was used in the catalytic reduction of organic pollutants such as MB and 4-NP with sodium borohydride (NaBH<sub>4</sub>) as a reducing agent, and the catalyst ability was evaluated by UV-visible spectroscopy. The catalyst L-SB-Cu showed highly catalyst ability towards MB and 4-NP, and it also showed good recyclability and reusability. This work showed a new strategy of utilizing bio-based catalyst as a highly efficiency catalyst to degrade organic pollutants.
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.
Submesh Splines over Hierarchical T-meshes
Jin, Liangbing,Deng, Jiansong,Chen, Falai Society for Computational Design and Engineering 2009 International Journal of CAD/CAM Vol.9 No.1
In this paper we propose a new type of splines-biquadratic submesh splines over hierarchical T-meshes. The biquadratic submesh splines are in rational form consisting of some biquadratic B-splines defined over tensor-product submeshes of a hierarchical T-mesh, where every submesh is around a cell in the crossing-vertex relationship graph of the T-mesh. We provide an effective algorithm to locate the valid tensor-product submeshes. A local refinement algorithm is presented and the application of submesh splines in surface fitting is provided.