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The Effects of Electro Slag Welding on Material Properties of Box Column Plates
Cheng-Cheng Chen,Yu-Chen Liang2 한국강구조학회 2011 International Journal of Steel Structures Vol.11 No.2
The effects of electro slag welding (ESW) on the material properties of box column plates, which is ASTM A572 Gr. 50steel, were investigated experimentally and numerically. The material properties of the column plates before and after ESW were evaluated by macro-etching observation, micro-structural observation, and CVN impact tests. The temperature distribution of the column plates, with the ESW heat cycle as the heat input, was simulated by using the ANSYS FEM software. It was found that: (1) The CVN values in the through thickness direction of the base metal can be as low as 14J, 8.1J, and 8.1J at 0oC for plate thicknesses of 32, 40, and 50 mm respectively; (2) During the ESW process, the measured peak temperature for a 25×50 mm column plate surface was as high as 1033, 880 and 744oC for plate thicknesses of 32, 40 and, 50 mm respectively;(3) After the ESW heat cycle, the through thickness CVN value decreased by 68% for the coarse grain heat affected zone (HAZ) of the column pate; (4) The FEM thermal conduction model developed was able to simulate the temperature distribution of the steel plate during the ESW process with reasonable accuracy; (5) To avoid welding penetration due to ESW, a minimum plate thickness is suggested; (6) The impact of ESW heat cycle is more significant for thin column plates compared to thick ones.
Cheng-Liang Huang,Li-Ming Chiang,Chien-An Su,YUAN-YAO LI 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Supercapacitors (SCs) are important devices for energy storage because they provide a higher power densityas compared to that of batteries. However, SCs with high energy density and good flexibility are stillunder development. In this study, we fabricated MnO2-coated Carbon nanotube (CNT)-embedded carbonnanofiber (CNF) (referred to as MnO2/CNF-CNT) core–shell cables to investigate pseudo-capacitators,while activated CNF-CNTs obtained by CO2 activation was used for Electrical double-layer capacitors(EDLCs). Owing to the unique structure of the materials and high electrical conductivity of the CNTson the CNFs, a specific capacitance of 483.5 F/g was achieved using MnO2/CNF-CNT mat with 1 MNa2SO4 aqueous electrolyte at 0.5 A/g. A flexible MnO2/CNF-CNT supercapacitor was assembled, whichwas binder-free, electrically conductive media-free, and current collector-free. Further an asymmetricsupercapacitor was assembled with the MnO2/CNF-CNT mat and activated CNF-CNT mat in an ionic liquid(1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide) electrolyte. The maximum specificcapacitance of, energy density of and power density of 94.25 F/g, 209.4 Wh/kg and 1000 W/kg can beachieved with the asymmetric supercapacitor at 0.5 A/g and 4.0 V. We believe that these materials havesignificant potential for use in light-weight and flexible SCs.
Structure and bioactivity of triterpenoids from the stems of Schisandra sphenanthera
Cheng-Qin Liang,Rong-Hua Luo,Ju-Ming Yan,Yan Li,Xiao-Nian Li,Yi-Ming Shi,Shan-Zhai Shang,Zhong-Hua Gao,Liu-Meng Yang,Yong-Tang Zheng,Wei-Lie Xiao,Hong-Bin Zhang,Han Dong Sun 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.2
Two new triterpenoids, schisphendilactoneA and B (1 and 2), together with three known triterpenoids,were isolated from the stems of Schisandra sphenanthera. Their structures were elucidated by spectroscopic methods,and the absolute configuration of 1 was determined bysingle-crystal X-ray diffraction. Compound 2 showedmoderate inhibitory activity against SW480 cancer cellline, and compound 5 exhibited promising anti-HIV-1activity with EC50 value of 0.52 lg ml-1 and therapeuticindex value of 117.12.
Cheng-Wu Liang,최원준,정낙신 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.8
On the basis of high binding affinity of 2-hexynyl-N6-methyladenosine and N6-substituted-4'-thioadenosine derivatives at the A3 adenosine receptor (AR), novel 2-alkynyl-substituted-N6-methyl-4'-thioadenosine derivatives, combining the characteristics of two classes of nucleosides were designed and synthesized from D-gulonic γ-lactone via palladium-catalyzed cross coupling reaction as a key step. Among compounds tested, only compound 3b showed moderate binding affinity at the human A3 adenosine receptor without binding affinities at other subtypes.
Simultaneous removal of Congo red and Cr(VI) using amino-modified GO/MS composite materials
Liang Cheng,Li Zhang,Hongxia Wang,Fang Xiang Song 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
Mesoporous silica (MS) and graphene oxide (GO) are good absorbents. Combining them not only preventsGO agglomeration but increases the number of MS active sites. In addition, their composites can preferentiallyadsorb specific pollutants after modification. In this work, amino-modified GO/MS materials were prepared by postgraftingto remove Congo red (CR) and Cr(VI) in solution. Characterization methods, such as X-ray diffraction (XRD),transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Zeta potential, and N2adsorption/desorption, were adopted. The prepared GO/MS@HBP has a porous structure with a specific surface areaof 49.32m2·g1. The effect of initial concentration, pH, adsorption time, temperature and other ions was determined onthe adsorption amount. Relying on this, the GO/MS@HBP maximum capacity for Cr(VI) and CR adsorption are93.73±2.3% and 257.69+1.5% mg·g1, respectively. Pseudo-second-order kinetic and Langmuir isotherms are moresuitable to describe the adsorption process, indicating that chemical adsorption plays a major role in the entire adsorptionprocess. Thermodynamics showed that the enthalpy (H) of materials adsorbing two pollutants was positive andthat the Gibbs free energy (G) was negative, suggesting that Cr(VI) and CR adsorption on GO/MS@HBP was spontaneouslyendothermic. GO/MS@HBP could simultaneously remove CR and Cr(VI) in solution, and be an effectiveadsorbent for removing harmful substances.
Liang Cheng,Fengming Qiang,Bin Zhu,Jinshan Li 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
Prominent interface sliding was noted in a fully lamellar Ti–43.5Al–8Nb–0.2W–0.2B alloy deformed in (α + γ) phaseregion with low strain rate, which is evidenced by the drastic α/γ lamellar offsets at the kink boundaries. Due to the effectiveaccommodation of interface sliding, there were only a few substructures produced at the kink bands in spite of the highstrain localization. By using the transmission electron microscopy, the interface sliding was demonstrated to be caused by theglide of pre-existing interfacial dislocations. Based on the metallurgical observations and kinetics analysis, two mesoscopicmodels for interface sliding were established corresponding to two alternative rate-controlling steps, i.e., intra-lamellardislocation climb-controlled or interfacial dislocation glide-controlled. Both of them predicted a Newtonian viscous shearbehavior but the latter was manifested to be more plausible to account for the interface sliding kinetics. In addition, the reliabilityof the model was discussed in detail, as well as the role of interface sliding during hot deformation. The developedmesoscopic model can be readily implemented into the crystal plasticity finite element method for a better understanding ofthe synergistic effects of the individual processes on the high temperature plastic flow of lamellar colonies in TiAl alloys.
Prediction of postoperative pancreatic fistula using a nomogram based on the updated definition
Cheng-Xiang Guo,Yi-Nan Shen,Qi Zhang,Xiao-Zhen Zhang,Jun-Li Wang,Shun-Liang Gao,Jian-Ying Lou,Ri-Sheng Que,Tao Ma,Ting-Bo Liang,Xue-Li Bai 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.98 No.2
Purpose: The International Study Group on Pancreatic Fistula’s definition of postoperative pancreatic fistula (POPF) has recently been updated. This study aimed to identify risk factors for POPF in patients having pancreaticoduodenectomy (PD) and to generate a nomogram to predict POPF. Methods: Data on 298 patients who underwent PD from March 2012 to October 2017 was retrospectively reviewed and POPF statuses were redefined. A nomogram was constructed using data from 220 patients and validated using the remaining 78 patients. Independent risk factors for POPF were identified using univariate and multivariate analyses. A predictive nomogram was established based on the independent risk factors and was compared with existing models. Results: Texture of the pancreas, size of the main pancreatic duct, portal vein invasion, and definitive pathology were the identified risk factors. The nomogram had a C-index of 0.793 and was internally validated. The nomogram performed better (C-index of 0.816) than the other most cited models (C-indexes of 0.728 and 0.735) in the validation cohort. In addition, the nomogram can assign patients into low- (less than 10%), intermediate- (10% to 30%), and high-risk (equal or higher than 30%) groups to facilitate personalized management. Conclusion: The nomogram accurately predicted POPF in patients having PD.