Synchronous immobilization and conversion of polysulfides on a VO₂-VN binary host targeting high sulfur load Li-S batteries

Song, Yingze,Zhao, Wen,Kong, Long,Zhang, Li,Zhu, Xingyu,Shao, Yuanlong,Ding, Feng,Zhang, Qiang,Sun, Jingyu,Liu, Zhongfan The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.9

<P>Lithium-sulfur (Li-S) batteries are deemed as one of the most promising next-generation energy storage systems. However, their practical application is hindered by existing drawbacks such as poor cycling life and low Coulombic efficiency due to the shuttle effect of lithium polysulfides (LiPSs). We herein present an <I>in situ</I> constructed VO2-VN binary host which combines the merits of ultrafast anchoring (VO2) with electronic conducting (VN) to accomplish smooth immobilization-diffusion-conversion of LiPSs. Such synchronous advantages have effectively alleviated the polysulfide shuttling, promoted the redox kinetics, and hence improved the electrochemical performance of Li-S batteries. As a result, the sulfur cathode based on the VO2-VN/graphene host exhibited an impressive rate capability with ∼1105 and 935 mA h g<SUP>−1</SUP> at 1C and 2C, respectively, and maintained long-term cyclability with a low capacity decay of 0.06% per cycle within 800 cycles at 2C. More remarkably, favorable cyclic stability can be attained with a high sulfur loading (13.2 mg cm<SUP>−2</SUP>). Even at an elevated temperature (50 °C), the cathodes still delivered superior rate capacity. Our work emphasizes the importance of immobilization-diffusion-conversion of LiPSs toward the rational design of high-load and long-life Li-S batteries.</P>

Activation of formyl CH and hydroxyl OH bonds in HMF by the CuO(1 1 1) and Co₃O₄(1 1 0) surfaces: A DFT study

Ren, Jun,Song, Kai-he,Li, Zhenhuan,Wang, Qiang,Li, Jun,Wang, Yingxiong,Li, Debao,Kim, Chan Kyung Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.456 No.-

<P><B>Abstract</B></P> <P>The first principle calculations with on-site Coulomb repulsion U terms were carried out to investigate the 5-hydroxymethylfurfural (HMF) adsorption on the CuO(1 1 1) and Co<SUB>3</SUB>O<SUB>4</SUB>(1 1 0) surfaces, two widely used oxidation catalysts. The adsorption of HMF molecule is energetically favoured in both cases, and HMF is more inclined to bridge adsorption via hydroxyl and formyl groups binding with surface O and metal sites. Moreover, the adsorption energy relies on both the coordination type of surface lattice oxygen to which the H atom binds and the formation of H-bond involving hydroxyl and formyl groups on the adsorbed HMF. Also, the hydroxyl OH bond breaking is very easy and is likely to be the first step in HMF oxidation, and then the OH insertion reaction to produce 2,5-furandicarboxylic acid (FDCA). The corresponding experimental results also show that the CuO and Co<SUB>3</SUB>O<SUB>4</SUB> surfaces are promising candidate catalysts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CuO(1 1 1) and Co<SUB>3</SUB>O<SUB>4</SUB>(1 1 0) surfaces catalyze the oxidation of 5-hydroxymethylfurfural (HMF). </LI> <LI> Initial binding was formed through bridged-adsorption with O atoms in HMF. </LI> <LI> Oxidation reaction proceeds through the OH bond breaking pathway. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic potential energy diagram for the formyl CH and hydroxyl OH bonds of HMF dissociation on CuO(1 1 1) and Co<SUB>3</SUB>O<SUB>4</SUB>(1 1 0) surfaces. Obviously, the hydroxyl OH bond breaking is easier than that of the formyl CH bond on the two surfaces, which indicates the first step of oxidation of HMF to FDCA should be hydroxyl OH bond breaking.</P> <P>[DISPLAY OMISSION]</P>

Preconditioning of canine adipose tissue-derived mesenchymal stem cells with deferoxamine potentiates anti-inflammatory effects by directing/reprogramming M2 macrophage polarization

Park, Su-Min,Li, Qiang,Ryu, Min-Ok,Nam, Aryung,An, Ju-Hyun,Yang, Ji-In,Kim, Sang-Min,Song, Woo-Jin,Youn, Hwa-Young Elsevier 2020 Veterinary immunology and immunopathology Vol. No.

<P><B>Abstract</B></P> <P>Preconditioning with hypoxia or hypoxia-mimetic agents has been tried with mesenchymal stem cells (MSCs) to improve the secretion of anti-inflammatory factors. These preconditioning procedures upregulate hypoxia inducible factor (HIF) 1-alpha leading to the transcription of HIF-dependent tissue protective and anti-inflammatory genes. Due to the limited number of studies exploring the activity of deferoxamine (DFO)—a hypoxia-mimetic agent—in MSCs, we aimed to determine whether DFO can enhance the secretion of anti-inflammatory substances in canine adipose tissue-derived (cAT)-MSCs. Furthermore, we investigated whether this activity of DFO could affect macrophage polarization and activate anti-inflammatory reactions. cAT-MSCs preconditioned with DFO exhibited enhanced secretion of anti-inflammatory factors such as prostaglandin E2 and tumor necrosis factor-α-stimulated gene-6. To evaluate the interaction between DFO preconditioned cAT-MSCs and macrophages, RAW 264.7 cells were co-cultured with cAT-MSCs using the Transwell system, and changes in the expression of factors related to macrophage polarization were analyzed using the quantitative real-time PCR and western blot assays. When RAW 264.7 cells were co-cultured with DFO preconditioned cAT-MSCs, the expression of M1 and M2 markers decreased and increased, respectively, compared to co-culturing with non-preconditioned cAT-MSCs. Thus, cAT-MSCs preconditioned with DFO can more effectively direct and reprogram macrophage polarization into the M2 phase, an anti-inflammatory state.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Deferoxamine enhances the secretion of anti-inflammatory substances in cAT-MSCs. </LI> <LI> DFO preconditioned cAT-MSCs exhibit enhanced prostaglandin E2 and TSG-6 secretion. </LI> <LI> DFO preconditioned cAT-MSCs reprogram macrophage polarization into the M2 phase. </LI> <LI> Preconditioning of cAT-MSCs with DFO may be applicable clinically. </LI> </UL> </P>

Posttranscriptional deregulation of Src due to aberrant miR34a and miR203 contributes to gastric cancer development

Qiang Hao,Xiao Zhao Lu,Nan Nan Liu,Xiao Chang Xue,Meng Li,Cun Zhang,Xin Qin,Wei Na Li,Zhen Shu,Bin Song,Qing Wang,Li Qiang Song,Wei Zhang,Ying Qi Zhang 생화학분자생물학회(구 한국생화학분자생물학회) 2013 BMB Reports Vol.46 No.6

Liver Resection for Hepatocellular Carcinoma Beyond BCLC A Stage

Tianqiang Song,Ti Zhang,Wei Zhang,Feng Fang,Qiang Wu,Yunlong Cui,Huikai Li,Qiang Li Korean Society of Gastrointestinal Cancer 2016 Journal of digestive cancer reports Vol.4 No.2

The barcelona clinic liver cancer (BCLC) staging systemis regarded as the optimal staging system to predict prognosis and guide treatmentfor hepatocellular carcinoma (HCC) .According to the BCLC classification, only patients with BCLC A stage should undergo liver resection. In contrast, patients with intermediate-advanced HCC should be scheduled for palliative therapies,such as transcatheter arterial chemoembolization (TACE) and target therapy, even if the lesion is resectable. More and more studies report good short-term and long-term outcomes in patients with intermediate-advanced HCC treated by radical resection and many patients benefited from curative resection. The aim of this review was to evaluate the role of surgery beyond the BCLC recommendations. A revision of the BCLC algorithm should be proposed.

The Flow Behavior and Forming Limit Modeling of an Al- Cu-Mg Aluminum Alloy Sheet Considering the Effects of Pre-Strain and Solution Heat Treatment

Xiao-Qiang Li,Gui-Qiang Guo,Hong-Zhi Gao,Nan Song,Dong-Sheng Li 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

Al-Cu-Mg aluminum alloy sheet is widely used for aircraft skin. Multi-stage forming combined with Solution Heat Treatment (SHT) is necessary for some geometrically complex productions in aircraft skin components. However, the effects of pre-strain and natural ageing time on the formability of Al-Cu-Mg aluminum alloy sheet are not fully understood. In this study, the deformation responses of an Al-Cu-Mg aluminum alloy sheet, over a range of pre-strain levels (0% to 6%) and natural ageing time levels (0 h to 2 h) were investigated. A modified Hollomon constitutive model coupling with pre-strain and natural ageing time was proposed to characterize the deformation responses of the Al-Cu-Mg aluminum alloy sheet. The hemispherical dome tests were performed at natural ageing time levels ranging from 0.25 h to 1.5 h. Marciniak and Kuczynski (M-K) theory was used to obtain the forming limit prediction model which takes pre-strain and natural ageing time into account. The theoretical Forming Limit Curves (FLCs) were compared with the experimental results.

Mechanism of heterogeneous mercury oxidation by HCl on V2O5(001) surface

Li Zhao,Yu Liu,Yang-wen Wu,Jian Han,Song-lin Zhang,Qiang Lu,Yong-ping Yang 한국물리학회 2018 Current Applied Physics Vol.18 No.6

The selective catalytic reduction (SCR) system for NOX removal in coal-fired power plants has a promoting effect on the oxidation and removal of elemental mercury. In this study, basic mechanism of mercury oxidation by V2O5-based SCR catalyst is investigated via density functional theory method and the periodic slab models. Calculations are conducted to determine the adsorption energies and geometries of Hg0, HgCl, HgCl2 and HCl on V2O5(001) surface, and to reveal the energy profile of oxidation reaction and the structures of relative transition states and intermediates. The results indicate that HCl can significantly promote Hg0 oxidation on V2O5(001) surface, by forming an intermediate HgCl-surface which is important for Hg0 oxidation. The Hg0 oxidation goes through Hg0→HgCl→HgCl2, and the two stages of the reaction follow Eley–Rideal mechanism and Langmuir- Hinshelwood mechanism, respectively. The formation of HgCl2 is the rate-determining step due to its high energy barrier. Three detailed reaction pathways are obtained, and the related energy profiles and structures are analyzed in detail. The Hg0 oxidation reaction can take place through all three pathways even if differences exist in each other, while pathways I and II have relatively low energy barriers.

Compensator Design of Permanent Magnet Synchronous Linear Motor Control System Based on Load Disturbance Observer

Li Zheng,Zhang Zi-Hao,Wang Jin-Song,Wang Kang-Tao,Guo Xiao-Qiang,Fan Dao-Hu,Sun He-Xu 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5

Aiming at the problem that the load disturbance generated by the permanent magnet synchronous linear motor (PMSLM) control system will affect its control performance and the load thrust of the PMSLM cannot be observed well, this design proposes two different load disturbance observers, namely the traditional Luenberger observer and novel internal model control (IMC) observer. The IMC observer observes the load disturbance in the form of proportional and integral, which can effectively improve the identification convergence speed and the compensation control effect. While observing the load disturbance, the two observers in this design can also use the generated thrust current compensation as the feedforward compensation of the system, to achieve disturbance suppression and effectively improve the control performance and robustness of the system. The PMSLM control system based on two observers is built in the simulation platform and the superiority of the designed control system is verified. Through the comparison and verification of the two observers and the no-observer system, it can be concluded that the control strategy can accurately track the load disturbance in the PMSLM, simplify the overall structure of the system, and effectively enhance the anti-disturbance capability and dynamic response capability of the PMSLM.

Study of Robustness Approximate Time-Optimal System

Song Yuan Xu,Li Qiang Yao,Hong Bing Rong,Shao Qing Xu 대한전자공학회 1992 대한전자공학회 Conference Vol.1992 No.2

Bacterial Foraging Optimization Based on LS-SVM for BTP Forecasting

SONG Qiang,GUO Xiao-bo,LI hua 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1

Because of the nonlinear characteristics of the BTP in sintering process, the BTP forecasting is difficult to realize. The LS-SVM was employed in this study for forecasting. However, Because SVM is using the two programming support vector, computing and solving two quadratic programming will involve matrix of order m, when the M number is large storage and computing the matrix will consume a large amount of computer memory and calculation time. The traditional training methods based on searching technique are not effective and fast. Therefore, bacterial foraging optimization (BFO) was adopted to optimize the LS-SVM. BFO is a novel and powerful global search technique, It is found that Bacteria Foraging Algorithm (BFO) is capable of improving the speed of convergence as well as the precision in the desired result. Simulation results clearly illustrate that the proposed approach is very efficient and could easily be extended for other global optimization problems. It can conclude that BFO is effective and rapid for the cluster analysis problem.