Non-volatile, Li-doped ion gel electrolytes for flexible WO₃-based electrochromic devices

Yun, Tae Yong,Li, Xinlin,Bae, Jaehyun,Kim, Se Hyun,Moon, Hong Chul Elsevier 2019 Materials & Design Vol.162 No.-

<P><B>Abstract</B></P> <P>Flexible electrochromic devices (ECDs) based on Li-doped ion gels and tungsten trioxide (WO<SUB>3</SUB>) are demonstrated. Colored ECDs cannot be produced using conventional ion gels comprised of copolymers and room temperature ionic liquids (RTILs) due to a lack of cations that can be inserted into WO<SUB>3</SUB>. Based on considerations of the coloration mechanism, we developed Li-doped ion gels and applied these to devices. The effects of Li salt concentration are systematically examined, with respect to device dynamics, coloration efficiency, and transmittance contrast. In addition, the coloration/bleaching switching stability of the ECD produced using optimal Li salt content is investigated. The ECD exhibits distinct colored and bleached states even after 24 h operation in air. Using the described Li-doped ion gel electrolytes, flexible WO<SUB>3</SUB> ECDs were successfully demonstrated with good bending stability and no electrolyte leakage.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Non-volatile, Li-doped ion gel electrolytes are designed for flexible WO<SUB>3</SUB>-based ECDs. </LI> <LI> ECDs exhibit low voltage operation (–0.9 V) and large transmittance contrast (~85%) between colored and bleached states. </LI> <LI> Electrolyte leakage is not observed in flexible ECDs containing Li-doped gel electrolyte when bending deformation is applied. </LI> <LI> Flexible ECDs maintain ~90.3 and ~84.5% of initial optical transmittance and coloration efficiency after 1000 bending tests. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Dual-Function Electrochromic Supercapacitors Displaying Real-Time Capacity in Color

Yun, Tae Yong,Li, Xinlin,Kim, Se Hyun,Moon, Hong Chul American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.50

<P>Dual-function electrochromic supercapacitors (ECSs) that indicate their real-time charge capacity in color are fabricated using tungsten trioxide (WO<SUB>3</SUB>) and Li-doped ion gels containing hydroquinone (HQ). The ECSs can simultaneously serve as either electrochromic devices or supercapacitors. The coloration/bleaching and charging/discharging characteristics are investigated between 0 and −1.5 V. At the optimal HQ concentration, large transmittance contrast (∼91%), high coloration efficiency (∼61.9 cm<SUP>2</SUP>/C), high areal capacitance (∼13.6 mF/cm<SUP>2</SUP>), and good charging/discharging cyclic stability are achieved. Flexible ECSs are fabricated on plastic substrates by exploiting the elastic characteristics of the gel electrolytes, and they exhibit good bending durability. Moreover, practical feasibility is evaluated by demonstrating the use of the ECSs as an energy storage device and a power source.</P> [FIG OMISSION]</BR>

Hanger로 보강된 스터드 접합부의 인장거동에 관한 실험적 연구

박휘규,김승훈,이리형,이용택,황홍순,이정희 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This paper presents the tensile behavior of the stud connection between reinforced concrete(RC) and steel members. Hanger reinforcements are placed around the studs to transfer the tensile loads to the opposite side of the concrete member. Six specimens, of which variables were arrangement details of hanger reinforcements and studs. Tensile test results show that hanger reinforcements are effective to increase tensile strength and ductility. Test tensile strengths of specimens are compared with the nominal strengths by ACI codes(ACI 318-02, ACI 349-99) and PCI 1999.

Solid-state dissimilar joining of stainless steel 316L and Inconel 718 alloys by electrically assisted pressure joining

Li, Yong-Fang,Hong, Sung-Tae,Choi, Howook,Han, Heung Nam Elsevier 2019 Materials characterization Vol.154 No.-

<P><B>Abstract</B></P> <P>Electrically assisted solid-state joining (or electrically assisted pressure joining, EAPJ) of dissimilar stainless steel 316L (SUS316L) and Inconel 718 (IN718) alloys is experimentally investigated. The specimen assembly for the experiment is comprised of two cylindrical solid specimens (SUS316L and IN718) with an identical geometry. In EAPJ, electric current and plastic compression are directly and simultaneously applied to the specimen assembly. The microstructural analysis confirms that crack/void-free joints are successfully fabricated by EAPJ in the selected dissimilar metal alloys without melting and solidification. An obvious atomic diffusion region at the joint interface is identified. The results of tensile tests show that all the joints fracture from the SUS316L side, which undergoes typical ductile fracture with large plastic deformation. The results of the present study confirm that the concept of EAPJ is applicable to solid state joining of dissimilar material combination.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrically assisted pressure joining of dissimilar metal alloys was conducted. </LI> <LI> Joining temperature was significantly lower than the melting temperatures. </LI> <LI> Solid state joint of stainless steel 316L and Inconel 718 alloys was fabricated. </LI> <LI> Tensile tests confirm the soundness of joints; no interfacial fracture occurred. </LI> </UL> </P>

Electrically assisted pressure joining of titanium alloys

Li, Yong-Fang,Das, Hrishikesh,Hong, Sung-Tae,Park, Ju-Won,Han, Heung Nam Elsevier 2018 Journal of manufacturing processes Vol.35 No.-

<P><B>Abstract</B></P> <P>Electrically assisted pressure joining (EAPJ) of a Grade 1 titanium (Ti) alloy is experimentally investigated. In EAPJ, an electric current is directly applied to the specimen during plastic compression. Microstructural analysis shows that solid-state joints are successfully fabricated in the selected Ti alloy without melting. Shear tensile tests shows that the strength and fracture modes of the joint are strongly affected by a combination of the amount of plastic deformation (corresponding to a thickness reduction) and the electric current intensity. An optimal thickness reduction, corresponding to the maximum fracture load, exists for each value of current intensity, and decreases as current intensity increases. A higher fracture load can be obtained by adjusting the combination of the current intensity and the thickness reduction parameters.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ti alloy are solid-state joined by electrically assisted pressure joining (EAPJ). </LI> <LI> The strength and fracture mode of the joint are affected by the EAPJ parameters. </LI> <LI> An optimal thickness reduction exists for each value of current intensity. </LI> <LI> The optimal thickness reduction decreases as the current intensity increases. </LI> </UL> </P>

Clinical Significance of Upregulation of mir-196a-5p in Gastric Cancer and Enriched KEGG Pathway Analysis of Target Genes

Li, Hai-Long,Xie, Shou-Pin,Yang, Ya-Li,Cheng, Ying-Xia,Zhang, Ying,Wang, Jing,Wang, Yong,Liu, Da-Long,Chen, Zhao-Feng,Zhou, Yong-Ning,Wu, Hong-Yan Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5

Background: miRNAs are relatively recently discovered cancer biomarkers which have important implications for cancer early diagnosis, treatment and estimation of prognosis. Here we focussed on expression of mir-196a-5p in gastric cancer tissues and cell lines so as to analyse its significance for clinicopathologic characteristics and generate enriched KEGG pathways clustered by target genes for exploring its potential roles as a biomarker in gastric cancer. Materials and Methods: The expression of mir-196a-5p in poorly, moderate and well differentiated gastric cancer cell lines compared with GES-1 was detected by RT-qPCR, and the expression of mir-196a-5p in gastric cancer tissues comparing with adjacent non cancer tissues of 58 cases were also assessed by RT-qPCR. Subsequently, an analysis of clinical significance of mir-196a-5p in gastric cancer and enriched KEGG pathways was executed based on the miRWalk prediction database combined with bioinformatics tools DAVID 6.7 and Mirfocus 3.0. Results: RT-qPCR showed that mir-196a-5p was up-regulated in 6 poorly and moderate differentiated gastric cancer cell lines SGC-7901, MKN-45, MKN-28, MGC-803, BGC-823, HGC-27 compared with GES-1, but down-regulated in the highly differentiated gastric cancer cell line AGS. Clinical data indicated mir-196a-5p to beup-regulated in gastric cancer tissues (47/58). Overexpression of mir-196a-5p was associated with more extensive degree of lymph node metastasis and clinical stage (P < 0.05; x2 test). Enriched KEGG pathway analyses of predicted and validated targets in miRWalk combined with DAVID 6.7 and Mirfocus 3.0 showed that the targeted genes regulated by mir-196a-5p were involved in malignancy associated biology. Conclusions: Overexpression of mir-196a-5p is associated with lymph node metastasis and clinical stage, and enriched KEGG pathway analyses showed that targeted genes regulated by mir-196a-5p may contribute to tumorgenesis, suggesting roles as an oncogenic miRNA biomarker in gastric cancer.

Intermedins A and B; New Metabolites from Schisandra propinqua var. intermedia

Hong-Mei Li,Chun Lei,Yong-Ming Luo,Xiao-Nian Li,Xiao-Lei Li,Jian-Xin Pu,San-Yun Zhou,Rong-Tao Li,Han-Dong Sun 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.6

A new dibenzocyclooctadiene lignan, intermedin A (1), and a new natural bisabolane sesquiterpenoid, intermedin B (2), were isolated from the aerial parts of Schisandra propinqua var. intermedia. Their structures were elucidated on the basis of extensive spectroscopical analysis.

A bovel phosphatidylinositol 3-kinase (PI3K) inhibitor, HS-106, induces apoptosis and inhibits angiogenesis of breast carcinoma by targeting PI3K/mTOR pathway

LI Guang-Yong,JUNG Kyung Hee,LEE Hyunseung,LEE Ju Hee,LEE Hee Seung,SEO Ju Hyeon,YAN Hong Hua,JEONG Yujeong,HAM Kyungrok,HONG Sungwoo,HONG Soon-Sun 大韓藥學會 2012 大韓藥學會 總會 및 學術大會 Vol.2012 No.1

Experimental axial force identification based on modified Timoshenko beam theory

Li, Dong-sheng,Yuan, Yong-qiang,Li, Kun-peng,Li, Hong-nan Techno-Press 2017 Structural monitoring and maintenance Vol.4 No.2

An improved method is presented to estimate the axial force of a bar member with vibrational measurements based on modified Timoshenko beam theory. Bending stiffness effects, rotational inertia, shear deformation, rotational inertia caused by shear deformation are all taken into account. Axial forces are estimated with certain natural frequency and corresponding mode shape, which are acquired from dynamic tests with five accelerometers. In the paper, modified Timoshenko beam theory is first presented with the inclusion of axial force and rotational inertia effects. Consistent mass and stiffness matrices for the modified Timoshenko beam theory are derived and then used in finite element simulations to investigate force identification accuracy under different boundary conditions and the influence of critical axial force ratio. The deformation coefficient which accounts for rotational inertia effects of the shearing deformation is discussed, and the relationship between the changing wave speed and the frequency is comprehensively examined to improve accuracy of the deformation coefficient. Finally, dynamic tests are conducted in our laboratory to identify progressive axial forces of a steel plate and a truss structure respectively. And the axial forces identified by the proposed method are in good agreement with the forces measured by FBG sensors and strain gauges. A significant advantage of this axial force identification method is that no assumption on boundary conditions is needed and excellent force identification accuracy can be achieved.

Ordered mesoporous Cu-Mn-Ce ternary metal oxide catalysts for low temperature water-gas shift reaction

Li, Chengbin,Li, Zhenghua,Oh, Hwa Yong,Hong, Gyong Hee,Park, Jin Seo,Kim, Ji Man Elsevier 2018 CATALYSIS TODAY - Vol.307 No.-

<P><B>Abstract</B></P> <P>Highly ordered mesoporous Cu-Mn-Ce ternary metal oxide materials with various Cu/Mn molar ratios were successfully synthesized by using a nano-casting method from a mesoporous silica template with a cubic <I>Ia</I>3<I>d</I> mesostructure. The ternary metal oxide materials were characterized by X-ray diffraction (XRD), N<SUB>2</SUB>-sorption, electron microscopy, Raman spectroscopy, H<SUB>2</SUB>-temperature programmed reduction and CO-temperature programmed desorption. The XRD results indicated that the materials did not show any diffraction peaks corresponding to copper and manganese oxides, ensuring the formation of Cu<I> <SUB>x</SUB> </I>Mn<SUB>0.2-<I>x</I> </SUB>Ce<SUB>0.8</SUB>O<SUB>2</SUB> (<I>x</I> =0–0.2). The WGS activity of the ternary metal oxide catalysts increased as the molar ratios of Cu/Mn increased. Among the catalysts, the mesoporous Cu<SUB>0.18</SUB>Mn<SUB>0.02</SUB>Ce<SUB>0.8</SUB>O<SUB>2</SUB> catalyst exhibited the best catalytic activity in low temperature range with zero methane yield. Moreover, this catalyst showed excellent catalytic stability during the reaction. The observed enhancement in the WGS performances were attributed to high surface area, uniform crystalline framework with increased structural defect, highly dispersed copper and manganese within the ceria lattice or on the surface, and strong metal support interaction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ordered mesoporous Cu-Mn-Ce ternary metal oxide catalyst showed an excellent WGS reaction performances. </LI> <LI> Copper and manganese, incorporated within the CeO<SUB>2</SUB> lattice, enhanced the activity. </LI> <LI> Mesoporous ternary metal oxides exhibited good nanostructural and catalytic stabilities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>