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Coral‑Like NiFe2O4/C Composite as the High‑Performance Anode Material for Lithium‑Ion Batteries
Shanshan Bao,Yifei Xiao,Junfeng Li,Bo Yue,Yanjun Li,Wenxian Sun,Lei Liu,Yi Huang,Li Wang,Peicong Zhang,Xuefei Lai 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
In this work, we fabricated NiFe2O4/C composite with a coral-like structure through co-precipitation approach followed bythermal decomposition. The composite with a large surface area of 162.1 m2 g−1 and an average pore size of 11.8 nm wasobtained. The porous structure in the composite derived from oxalate can Effectively accommodate the volume changesof NiFe2O4 during the cycling processes. When used as anode materials, the initial charge and discharge capacities of thecomposite were 926.7 and 1277.7 mAh g−1 at 100 mA g−1. After 50 cycles, the reversible capacity of NiFe2O4/C could stillremain at 892.4 mAh g−1. Even at a current density of 2000 mA g−1, the reversible capacity still reached 523.3 mAh g−1. The results showed that the synergy between NiFe2O4 and carbon improved the electrochemical performance, and the porouscomposite could stabilize the structure of the electrode.
Studies on Axial Tensile Loading Capacity of CHS T-joints Reinforced with External Stiffening Rings
Shanshan Huang,Lei Zhu,Hailin Sun,Miao Wang,Xi Chen 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3
To analyze the eff ects of stiff ening external rings on the brace axial tension capacity of circular hollow section T-joints (CHST), loading experiments and fi nite element model analysis were utilized. Three groups of full-scale specimens (reinforced and unreinforced T-joints) of diff erent brace-to-chord diameter ratios were tested under tension to validate the strengthening eff ect (Three unreinforced specimens were previously tested and the other three reinforced samples were newly completed). The experimental equipment and parameters are described in detail. Load–ovalization and load–displacement curves in addition to the failure modes were analyzed. It is concluded that the ultimate strength and initial stiff ness are signifi cantly enhanced for the reinforced CHS joints compared to the unreinforced specimens. SHELL181 elements were utilized in the fi nite element analysis to accurately simulate the loading capacity with and without external stiff ening rings of the joints, within 10% error.
Shanshan Liu,Di Wu,Lin Li,Xiao Sun,Wei-Dong Xie,Xia Li 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.8
1-oxoeudesm-11(13)-eno-12,8a-lactone (OEL),a novel eudesmane-type sesquiterpene compound, has beenshown to inhibit the growth of some cancer cell lines andinduce significant apoptosis. Here, we investigated the anticanceractivities of OEL in human lung cancer cells. Ourstudies demonstrated that OEL induced both apoptosis andautophagy in A549 and H460 cells. OEL-induced autophagywas assessed by appearance of autophagic vacuoles,formation of acidic vesicular organelles, conversion ofLC3-I to LC3-II, recruitment of LC3-II to the autophagosomes,and activation of autophagy genes. Furthermore,administration of autophagic inhibitor 3-methyladenineaugments OEL-induced apoptotic cell death. The inductionof autophagy and apoptosis by OEL links to NF-jB activationand the generation of reactive oxygen species (ROS). Interruption of NF-jB activation by specific inhibitor promotesapoptosis, but decreases autophagy. ROS antioxidants(N-acetylcysteine) attenuated both OEL-inducedautophagy and apoptosis. Further experiments confirmedthat OEL-induced activation of ROS was increased by NFjBinhibitor whereas NF-jB activation was not affected by ROS inhibition. These findings suggest that OEL-elicitedautophagic response plays a protective role that impedescell death, and inhibition of autophagy could be anadjunctive strategy for enhancing the chemotherapeuticeffect of OEL as an antitumor agent.
Effect of Texture and Microstructure on Tensile Behaviors in the Polycrystalline Pure Niobium
Shanshan Zhang,Yuancai Liu,Tiewei Xu,Mingxue Sun,Qi Zhang,Yong Wan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
Pure polycrystalline niobium had different texture and microstructure due to the RCD-60, RCD-84 and CD-84 fabricationprocesses and recrystallization at 1000 °C for 2 h. The tensile behaviors and texture evolutions of the niobium were investigatedto reveal the correlation of initial texture/microstructure and tensile properties. The crucial differences of microstructureand orientations after recrystallization would influence tensile properties of the niobium. The differences of tensile behaviorsduring tension testing correspond to the different microstructure and texture evolution in the niobium. The enhanced ⟨110⟩ //RD texture during the tensile deformation indicates that orientations of sub-structures are arranging along the tensile axis inthe RCD-60 niobium. The RCD-84 and CD-84 niobium present the other phenomenon, that sub-structures near the fractureoccur a significant rotation and the ⟨110⟩ // RD texture has been slightly changed after tensile failure. The recrystallizedniobium fabricated by the RCD-84 obtains excellent tensile properties with ultimate tensile strength of 364 MPa and elongationof 55%. The strain hardening rate of the CD-84 niobium is the highest during the initial stage of tensile deformation,and becomes lower than that of the RCD-84 niobium after the 16% strain. Furthermore, the analysis of Taylor factors isapplied to reveal the difference of hardening rates during tensile deformation due to different fabrication and recrystallizationprocesses of the polycrystalline niobium.
Liu, Shanshan,Wu, Di,Li, Lin,Sun, Xiao,Xie, Weidong,Li, Xia 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.8
1-oxoeudesm-11(13)-eno-$12,8{\alpha}$-lactone (OEL), a novel eudesmane-type sesquiterpene compound, has been shown to inhibit the growth of some cancer cell lines and induce significant apoptosis. Here, we investigated the anticancer activities of OEL in human lung cancer cells. Our studies demonstrated that OEL induced both apoptosis and autophagy in A549 and H460 cells. OEL-induced autophagy was assessed by appearance of autophagic vacuoles, formation of acidic vesicular organelles, conversion of LC3-I to LC3-II, recruitment of LC3-II to the autophagosomes, and activation of autophagy genes. Furthermore, administration of autophagic inhibitor 3-methyladenine augments OEL-induced apoptotic cell death. The induction of autophagy and apoptosis by OEL links to NF-${\kappa}B$ activation and the generation of reactive oxygen species (ROS). Interruption of NF-${\kappa}B$ activation by specific inhibitor promotes apoptosis, but decreases autophagy. ROS antioxidants (N-acetylcysteine) attenuated both OEL-induced autophagy and apoptosis. Further experiments confirmed that OEL-induced activation of ROS was increased by NF-${\kappa}B$ inhibitor whereas NF-${\kappa}B$ activation was not affected by ROS inhibition. These findings suggest that OEL-elicited autophagic response plays a protective role that impedes cell death, and inhibition of autophagy could be an adjunctive strategy for enhancing the chemotherapeutic effect of OEL as an antitumor agent.
Kang Min,Yanyan Sun,Chen-Han Lee,Pengcheng Hu,Shanshan He 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.11
In computer numerical control machining, tool paths are typically represented with piecewise linear segments (GO1s), which lack G1 and G2 continuity and cause fluctuation of feed rate and acceleration. To improve the continuity of tool paths, some method, e.g., B-spline tool path fitting, is preferred. However, none of the currently B-spline fitting method satisfies all tool-path fitting requirements of arc-length parameterization, G2 continuity and smoothness across the whole path. The aim of this research is to derive an industrial-strength method for B-spline tool path fitting, satisfying all of the named requirements. The improvements cover the arc-length based parameterization, G2 continuity as well as numerically measure to improve the quality of B-spline tool paths. To achieve arc-length parameterization, a preliminary fitting is added to evaluate arc-length and guide the parameterization (i.e., knot vector assignment); for joint G2-continuity, a five-control-point B-spline which satisfies chord error and shape-preserving constraints is constructed to blend adjacent B-splines; and a method based on the Hausdorff distance between the fitted B-splines and the original polylines is used to evaluate the fitting quality, and an additional refinement procedure is employed when the evaluation finds any disqualification. Simulation and experiment results prove that the proposed methods are effective.
Biodegradable Magnesium Alloy Stents as a Treatment for Vein Graft Restenosis
Yugang Li,Lei Wang,Shanshan Chen,Dan Yu,Weifeng Sun,Shijie Xin 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.5
Purpose: To explore the effects of biodegradable magnesium alloy stents (BMAS) on remodeling of vein graft (VG) anastomoticrestenosis. Materials and Methods: To establish a VG restenosis model, seventy two New Zealand rabbits were randomly divided into threegroups according to whether a stent was implanted in the graft vein or not. BMASs and 316L stainless steel stents were implantedin BMAS and 316L groups, respectively, while no stent was implanted in the no-treatment control group (NC group). Loss of lumendiameter in the graft vein was measured in all three groups. Upon harvesting VG segments to evaluate intimal proliferationand re-endothelization, the degradation and biological safety of the stents were observed to explore the effects of BMAS on VGremodeling. Results: Model establishment and stent implantation were successful. The BMAS reduced lumen loss, compared with the controlgroup (0.05±0.34 mm vs. 0.90±0.39 mm, p=0.001), in the early stage. The neointimal area was smaller in the BMAS group than the316L group after 4 months (4.96±0.66 mm2 vs. 6.80±0.69 mm2, p=0.017). Re-endothelialization in the BMAS group was better thanthat in the 316L group (p=0.001). Within 4 months, the BMAS had degraded, and the magnesium was converted to phosphorusand calcium. The support force of the BMAS began to reduce at 2–3 months after implantation, without significant toxic effects. Conclusion: BMAS promotes positive remodeling of VG anastomosis and has advantages over the conventional 316L stents in thetreatment of venous diseases.
Impact of Grafting Density on the Self-Assembly and Hydrophilicity of Succinylated Collagen
Wenxin Wang,Feiyi Shu,Lingyu Pan,Shanshan Huang,Xiao Tu,Ping Li,Siman Li,Yuanyuan Li,Chengzhi Xu,Yang Sun,Juntao Zhang,Haibo Wang 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
Modification of protein could give their new functionality but would affect their intrinsic property and activity. In this paper, a series of succinylated collagen (SCol(n/1)) (n≥1) were prepared by modification of collagen with succinic anhydride at different molar ratio to amino groups amount of collagen. The impact of grafting density on the intrinsic self-assembly and additional hydrophilicity of succinylated collagen was explored. The results revealed that excessive grafting density of succinylated collagen would improve their hydrophilicity but weaken their self-assembly property, although the triple helix of collagen could be reserved after succinylation. SCol(1/1) (grafting density of 17%) with self-assembly property and good hydrophilicity was chosen to compare with native collagen. Compared to native collagen, thermostability of SCol(1/1) decreased slightly, however, SCol(1/1) could form softer hydrogel, which was more favorable for the proliferation of NIH/3 T3. The present work would help us to further understand the importance of grafting density for the design of modified collagen with intrinsic self-assembly property and additional new functionality.