Preparation of lithium-doped NaV6O15 thin film cathodes with high cycling performance in SIBs

Xu Hai-Yan,Ruan Jun Hai,Liu Fang Lin,Li Dong-Cai,Zhang Feng-Jun,Wang Ai-Guo,Sun Dao-Sheng,오원춘 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.3

Lithium ions-doped NaV6O15 thin films have been prepared using a simple low temperature liquid phase deposition method and subsequent annealing process. X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), scanning elec- tron microscopy (SEM), and photoelectron spectroscopy (XPS) have been used to study the structural and physicochemical characteristics of the NaV6O15 film. The films were grown on the FTO conductive glass and used directly as an electrode of sodium ion batteries. The prepared lithium ions-doped NaV6O15 thin film electrodes showed an excellent cycling stability and discharge capacity, which may be attributed to the stability of the Li+ embedded into the gap between the V–O layers to maintain the structure and its stable β-phase structure transformed after the first cycle. The cycling stability greatly improved with increasing annealing temperature, while the discharge capacity decreased. The capacities of the film electrodes annealed at 400 °C and 450 °C maintained above 97% after 100 cycles. The lithium-doped NaV6O15 underwent a phase transition dur- ing the first charge/discharge cycle. The new transformed phase has perfect crystal structure stability undergoing insertion and deinsertion of Na+. Therefore, the lithium-doped NaV6O15 thin film possesses good cycling stability and is expected to be a promising thin film cathode for sodium-ion batteries.

Membrane-based electrochemical device for monitoring nanowires in aqueous samples

Li, Cheng Ai,Kim, Duk Hwan,Park, Jeunghee,Kim, Duckjong Elsevier 2017 Sensors and actuators. B Chemical Vol.242 No.-

<P><B>Abstract</B></P> <P>We report a membrane-based electrochemical detection of nanowires in aqueous sample. A gold-coated membrane is used both as a membrane filter and a working electrode. Using filtration method, it is possible to concentrate silver and zinc oxide nanowires on the gold working electrode on top of the membrane and the nanowires on the electrode can be differentiated and quantified by differential pulse voltammetry. Moreover, the new method shows better reproducibility in comparison with conventional immersion method, without modification of electrode surface according to the nanomaterial to be detected.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Membrane-based electrochemical device was developed for nanowire detection. </LI> <LI> Nanomaterials are concentrated and electrochemically quantified in one device. </LI> <LI> Silver and zinc oxide nanowires were successfully quantified by using the device. </LI> <LI> The new method shows distinct improvement in measurement reproducibility. </LI> </UL> </P>

Pharmacological blockade of cholesterol trafficking by cepharanthine in endothelial cells suppresses angiogenesis and tumor growth

Lyu, Junfang,Yang, Eun Ju,Head, Sarah A.,Ai, Nana,Zhang, Baoyuan,Wu, Changjie,Li, Ruo-Jing,Liu, Yifan,Yang, Chen,Dang, Yongjun,Kwon, Ho Jeong,Ge, Wei,Liu, Jun O.,Shim, Joong Sup Elsevier 2017 Cancer letters Vol.409 No.-

<P><B>Abstract</B></P> <P>Cholesterol is an important modulator of membrane protein function and signaling in endothelial cells, thus making it an emerging target for anti-angiogenic agents. In this study, we employed a phenotypic screen that detects intracellular cholesterol distribution in endothelial cells (HUVEC) and identified 13 existing drugs as cholesterol trafficking inhibitors. Cepharanthine, an approved drug for anti-inflammatory and cancer management use, was amongst the candidates, which was selected for in-depth mechanistic studies to link cholesterol trafficking and angiogenesis. Cepharanthine inhibited the endolysosomal trafficking of free-cholesterol and low-density lipoprotein in HUVEC by binding to Niemann-Pick disease, type C1 (NPC1) protein and increasing the lysosomal pH. The blockade of cholesterol trafficking led to a cholesterol-dependent dissociation of mTOR from the lysosomes and inhibition of its downstream signaling. Cepharanthine inhibited angiogenesis in HUVEC and in zebrafish in a cholesterol-dependent manner. Furthermore, cepharanthine suppressed tumor growth in vivo by inhibiting angiogenesis and it enhanced the antitumor activity of the standard chemotherapy cisplatin in lung and breast cancer xenografts in mice. Altogether, these results strongly support the idea that cholesterol trafficking is a viable drug target for anti-angiogenesis and that the inhibitors identified among existing drugs, such as cepharanthine, could be potential anti-angiogenic and antitumor agents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A phenotypic screen identified 13 existing drugs, including cepharanthine, as cholesterol trafficking inhibitors. </LI> <LI> Cepharanthine inhibited lysosomal cholesterol trafficking by binding to NPC1 protein and increasing the lysosomal pH. </LI> <LI> The blockade of cholesterol trafficking led to a cholesterol-dependent dissociation of mTOR from the lysosomes. </LI> <LI> Cepharanthine inhibited angiogenesis in HUVEC and in zebrafish in a cholesterol-dependent manner. </LI> <LI> Cepharanthine treatment enhanced the antitumor activity of cisplatin in lung and breast cancer xenografts in mice. </LI> </UL> </P>

A large-area free-standing graphene oxide multilayer membrane with high stability for nanofiltration applications

Chen, Long,Li, Yanhui,Chen, Lina,Li, Na,Dong, Chenglong,Chen, Qiong,Liu, Beibei,Ai, Qing,Si, Pengchao,Feng, Jinkui,Zhang, Lin,Suhr, Jonghwan,Lou, Jun,Ci, Lijie Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.345 No.-

<P><B>Abstract</B></P> <P>A flexible and free-standing graphene oxide and nylon 6 (GO@nylon 6) multilayer nanofiltration membrane was prepared by a layer-by-layer assembly process. The combination of electrospinning and electrospraying technique was employed, which can facilely prepare large-area membrane with size of 20 × 30 cm. The mechanical stability of multilayer membrane has enhanced significantly due to the tightly locked structure achieved by nylon 6 nanofibers network. The novel GO@nylon 6–13 multilayer nanofiltration membrane demonstrated a pure water flux up to 11.15 L m<SUP>−2</SUP> h<SUP>−1</SUP> bar<SUP>−1</SUP>, while keeping high organic dye rejection rate (>95% for methylene blue, and >99% for methyl orange). The rejections rate of the Na<SUB>2</SUB>SO<SUB>4</SUB>, NaCl, CuSO<SUB>4</SUB>, and Pb(NO<SUB>3</SUB>)<SUB>2</SUB> were 56.5%, 27.6%, 36.7%, and 18.9%, respectively. Furthermore, GO@nylon 6–13 multilayer nanofiltration membrane also demonstrated a high flux of some common organic solvents (8.4, 5.3, and 0.8 L m<SUP>−2</SUP> h<SUP>−1</SUP> bar<SUP>−1</SUP> for methanol, ethanol, and NMP, respectively), showing excellent chemical stability for separation process in those solvents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large-area GO@nylon 6 multilayer nanofiltration membrane was prepared. </LI> <LI> The multilayer structure enhances the mechanical stability. </LI> <LI> The multilayer membrane demonstrates a high water flux. </LI> <LI> The multilayer membrane shows high rejection rate for organic dyes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Photograph and cross-section SEM image of GO@nylon 6 multilayer nanofiltration membrane, the inset shows the water contact angle.</P> <P>[DISPLAY OMISSION]</P>

A Circuit Simulation Model for An Uitra-fast IGBT And Analysis of Parameter Sensitivity

Ai-min Li,Xiang-ning He,Zhao-ming Qian 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10

Based on existing built-in models of PSpice, by the composite model principle, a composite Insulated Gate Bipolar Transistor (IGBT) model for an ultra-fast IGBT is presented Comparison between measurement and simulation results shows good agreement in transient and steady-state behaviour of the IGBT Parametric sentive analysis of this model is performed, and validity of the composite model is discussed.

New analytical solutions to water wave diffraction by vertical truncated cylinders

Li, Ai-jun,Liu, Yong The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2

This study develops new analytical solutions to water wave diffraction by vertical truncated cylinders in the context of linear potential theory. Three typical truncated surface-piercing cylinders, a submerged bottom-standing cylinder and a submerged floating cylinder are examined. The analytical solutions utilize the multi-term Galerkin method, which is able to model the cube-root singularity of fluid velocity near the edges of the truncated cylinders by expanding the fluid velocity into a set of basis function involving the Gegenbauer polynomials. The convergence of the present analytical solution is rapid, and a few truncated numbers in the series of the basis function can yield results of six-figure accuracy for wave forces and moments. The present solutions are in good agreement with those by a higher-order BEM (boundary element method) model. Comparisons between present results and experimental results in literature and results by Froude-Krylov theory are conducted. The variation of wave forces and moments with different parameters are presented. This study not only gives a new analytical approach to wave diffraction by truncated cylinders but also provides a reliable benchmark for numerical investigations of wave diffraction by structures.

A single-walled carbon nanotube thin film-based pH-sensing microfluidic chip

Li, Cheng Ai,Han, Kwi Nam,Pham, Xuan-Hung,Seong, Gi Hun The Royal Society of Chemistry 2014 The Analyst Vol.139 No.8

<P>A novel microfluidic pH-sensing chip was developed based on pH-sensitive single-walled carbon nanotubes (SWCNTs). In this study, the SWCNT thin film acted both as an electrode and a pH-sensitive membrane. The potentiometric pH response was observed by electronic structure changes in the semiconducting SWCNTs in response to the pH level. In a microfluidic chip consisting of a SWCNT pH-sensing working electrode and an Ag/AgCl reference electrode, the calibration plot exhibited promising pH-sensing performance with an ideal Nernstian response of 59.71 mV pH<SUP>−1</SUP> between pH 3 and 11 (standard deviation of the sensitivity is 1.5 mV pH<SUP>−1</SUP>, <I>R</I><SUP>2</SUP> = 0.985). Moreover, the SWCNT electrode in the microfluidic device showed no significant variation at any pH value in the range of the flow rate between 0.1 and 15 μl min<SUP>−1</SUP>. The selectivity coefficients of the SWCNT electrode revealed good selectivity against common interfering ions.</P> <P>Graphic Abstract</P><P>A novel microfluidic pH-sensing chip integrated with a pH-sensing SWCNT electrode and an Ag/AgCl reference electrode was developed. The SWCNT thin film acted both as an electrode and a pH-sensitive membrane. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3an02195e'> </P>

Do Model Essays in English Writing Textbooks Potentially Misguide EFL Learners` Use of Linking Adverbials? A Corpus-Based Study

( Ai Jing Li ),( Mun Hong Choe ) 한국현대언어학회 2014 언어연구 Vol.29 No.4

A corpus-based analysis of the use of linking adverbials (LAs) in model essays for students of English and authentic essays composed by professional writers was conducted with a self-established model essay corpus (MEC) and the New York Times Annotated Corpus (NYTAC). Data from the two corpora were retrieved and analyzed by means of Antconc 3.2.4. It was found that the percentages of the top ten most frequently used LAs accounted for 46% and 52% of the total number of LAs used in MEC and NYTAC, respectively. The model essays contained far more instances of additive, adversative, causal/resultative, and sequential LAs, but significantly fewer types of LA than did NYTAC. Further, LAs in MEC were predominantly placed at sentence initial position whereas those in NYTAC were employed at varying positions in a sentence. (Chonnam National University)

A Study on Tennis Competition Enhancement Technology on the Basis of Virtual Reality Technology

Li Ai’jun 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.12

With the development of the science and technology, as one of the hot direction of IT, the virtual reality technology has been widely used in more and more fields. Wherein, in sports competition, it is particularly prominent. This paper is based on the related theories of virtual reality, sets up the tennis dynamics model, using ODE technology to operate the simulation system. By simulating the trajectory and collision detection, this paper has drawn a conclusion that virtual reality technology can make accurate and scientific simulation on sports competition both in static and simulation lab environment. Therefore, the computer virtual technology has a catalytic effect on sports competition enhancement technology. Moreover, this paper will open up new ideas for the application of computer virtual technology on sports competition enhancement technology, and also provide the theoretical basis for related researches.

AN EXPLANATION ON TRANSIENT BRIGHTENING BY MAGNETIC RECONNECTION THEORY

LI BI-QIANG,LI XIAO-QING,AI GUO-XIANG The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1

It. has been discovered that. active regions commonly have numerous flare-like transient. loop brightenings. We use a magnetic reconnection theory driven by a ponderamotive force on account. of the basic properties of a transient. brightening: lifetime a few mins, total energy $10^{25}\~10^{29}$ erg. The numerical results are consistent with the observations.