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Liu Zheng,Qiu Yuan,Yang Chunshan,Feng Jin,Jing Benqin 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Reliable battery model and identifi ed model parameter are the preconditions for Power battery state estimation with high precision. Aiming at the disadvantage of existing integer order impedance modeling in characterizing the dynamic characteristics of Lithium-ion ferrous phosphate (LFP) batteries, a simplifi ed fractional order (FO) impedance model including constant phase element and Warburg element is proposed based on the analysis of simplifi ed electrochemical impedance spectroscopy curve. With the Grunwald–Letnikov defi nition based factional order numerical calculation, the FO Kalman fi lter (FO-KF) method based on the derived model is designed to identify the FO impedance model parameter and terminal voltage. The proposed FO impedance model can better represent the nonlinear dynamic performances of LFP batteries, and the Grunwald–Letnikov defi nition based FO-KF algorithm can maintain good accuracy in the numerical calculation of FO parameter identifi cation. The experimental validation results show that the combination of simplifi ed FO impedance model and FO-KF method can improve the modeling precision and parameter identifi cation performance compared with the common integer order impedance model under two diff erent test conditions.
Chidchon Sararuk,Dan Yang,Guoliang Zhang,Chunshan Li,Suojiang Zhang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Ethyl acrylate (EA) is synthesized by ethyl acetate (EtOAc) with formaldehyde (FA) through aldolcondensation withfixed-bed reactor, and a series of Ce–P–Cs/g-Al2O3 catalyst was developed. Thecatalysts were characterized with XRD, XPS, SEM-EDS, NH3- and CO2-TPD, BET, and pyridine FTIR. Theinfluence of acidity and basicity on activity was discussed. Catalytic performances were further improvedby the addition of small amounts of Ce. Key reaction parameters, such as amount of metal loading, spacevelocity and reaction temperature, were also optimized. The optimum condition demonstrated amaximum EA yield of 31.38% and 60.03% selectivity toward EA.
Huazheng Shi,Zuguo Yuan,Zheng Yuan,Chunshan Yang,Jian Zhang,Yi Shou,Wenrui Zhang,Zhaofu Ping,Xin Gao,Shiyuan Liu 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.2
Objective: To assess clinical value of fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (PET/CT) for differentiation of malignant from benign focal thyroid incidentaloma. Materials and Methods: This retrospective study included 99 patients with focal thyroid incidentaloma of 5216 non-thyroid cancer patients that had undergone PET/CT. PET/CT semi-quantitative parameters, volume-based functional parameters, metabolic tumor volume (MTV), and total lesion glycolysis (TLG) of thyroid incidentaloma were assessed. Receiver-operating characteristic (ROC) analysis was conducted and areas under the curve (AUC) were compared by Hanley and McNeil test to evaluate usefulness of maximum standardized uptake value (SUVmax), MTV and TLG, as markers for differentiating malignant from benign thyroid incidentalomas. Results: Of 99 thyroid incidentalomas, 64 (64.6%) were malignant and 35 (35.4%) were benign. Malignant thyroid incidentalomas were larger (1.8 cm vs. 1.3 cm, p = 0.006), and had higher SUVmax (11.3 vs. 4.8, p < 0.001), MTV (all p < 0.001) and TLG (all p < 0.001) than benign. TLG 4.0 had the highest performance for differentiation of malignant from benign thyroid incidentaloma in all semi-quantitative parameters with AUC 0.895 by ROC curve analysis. AUC (TLG 4.0) was significantly larger than AUC (SUVmean), AUC (MTV 2.5), AUC (MTV 3.0), AUC (MTV 3.5), AUC (TLG 2.5), and AUC (TLG 3.0), respectively (all, p < 0.05). There was no statistical difference between AUC (TLG 4.0) and AUC (SUVmax) (p > 0.05). A threshold TLG 4.0 of 2.475 had 81.3% sensitivity and 94.3% specificity for identifying malignant thyroid incidentalomas. Conclusion: Volume-based PET/CT parameters could potentially have clinical value in differential diagnosis of thyroid incidentaloma along with SUVmax.