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Wang, Hongchao,Hwang, Junphil,Zhang, Chao,Wang, Teng,Su, Wenbin,Kim, Hoon,Kim, Jungwon,Zhai, Jinze,Wang, Xue,Park, Hwanjoo,Kim, Woochul,Wang, Chunlei Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.27
<P>SnTe alloys, which have the same crystal structure as PbTe, have attracted increasing attention. Here, we demonstrate that the synergistic effect of band structure modification and chemical bond softening can be realized simultaneously in In & Mn doped SnTe bulk alloys. The Seebeck coefficient and power factor are synergistically improved by co-doping of In and Mn. In doping is known to introduce a resonance level. Mn doping reduces the separation of light- and heavy-valence bands. The combination of these effects significantly enhances the Seebeck coefficient at room temperature owing to around a factor of five times increase in the band effective mass. The reduction of thermal conductivity is from the decrease of both the electronic and phononic parts. The electronic thermal conductivity is decreased by the increase in defect scattering, as can be confirmed by the carrier mobility. The force constant of the bonds around the Te site is decreased due to the co-doping of In & Mn, which indicates that the chemical bonds are softened, which leads to low sound velocity and lower lattice thermal conductivity. As a result, the peak thermoelectric figure of merit,<I>zT</I>= 1.03 has been achieved for Sn0.89In0.01Mn0.1Te at 923 K. This strategy of using the synergistic effect of band structure modification and chemical bond softening could be applicable to other thermoelectric materials.</P>
Wang Jianle,Xia Dongdong,Lin Yan,Xu Wenbin,Wu Yaosen,Chen Jiaoxiang,Chu Junjie,Shen Panyang,Weng Sheji,Wang Xiangyang,Shen Lifeng,Fan Shunwu,Shen Shuying 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Low back pain, triggered by intervertebral disc degeneration (IVDD), is one of the most common causes of disability and financial expenditure worldwide. However, except for surgical interventions, effective medical treatment to prevent the progression of IVDD is lacking. This study aimed to investigate the effects of circKIF18A, a novel circRNA, on IVDD progression and to explore its underlying mechanism in IVDD. In this study, we found that oxidative stress was positively correlated with nucleus pulposus cell (NPC) senescence in IVDD and that circKIF18A was downregulated in IVDD and attenuated senescent phenotypes such as cell cycle arrest and extracellular matrix degradation in NPCs. Mechanistically, circKIF18A competitively suppressed ubiquitin-mediated proteasomal degradation of MCM7, and the protective effects of circKIF18A on NPCs were partially mediated by MCM7 under oxidative stress. Intradiscal injection of adenoviral circKIF18A ameliorated IVDD in a rat model. This study revealed that circKIF18A regulates NPC degeneration by stabilizing MCM7 and identified a novel signaling pathway, the circKIF18A-MCM7 axis, for anti-senescence molecular therapy in IVDD.
Research on Terrain Reconstruction of Twin Sequence Images in Lunar Exploration
Wang Wei,Zhao Wenbin,Zhao Zhengxu 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5
The detectors are an important tool in deep space exploration; they can provide a large number of images which contain the ground environment information of celestial body. Bythree-dimensional reconstruction, terrain information can be extracted from these images, such as elevation data and texture data. This paper focuses on an adaptive terrain reconstruction for sequence image. A method, which calculate Binocular geometric model with matching measures of matching points and random sample consensus algorithm, is proposed. On the basic of this method, a densepoints matching method based on epipolar and homography constraints is presented. Besides the selection method of reconstruction image and the terrain reconstruction flow are discussed. The proposed adaptive terrain reconstruction satisfies the automation and real time requirement of some terrain reconstruction task, such as landing filed selection in detector landing, and is experiment and applied into sequence image of detector ChangE III’s landing camera, so as to ensure the safety of detector landing.
Wenbin Wang,Xiangpo Qiu,Ho Soo Kim,Yanxin Yang,Dianyun Hou,Xuan Liang,곽상수 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.1
Dehydroascorbate reductase (DHAR) plays a critical role in the regeneration of ascorbic acid (AsA), and widely involved in plant tolerance to biotic and abiotic stresses. In this study, the IbDHAR3 gene was cloned from sweetpotato cultivar Xushu 18 by RT-PCR. The full-length of this gene was 813 bp which encodes 270 amino acids. The IbDHAR3 protein contained two conserved domains of glutathione S-transferase (GST) and GST-C-DHAR, and one chloroplast transit peptide with 52 amino acids length. Transient expression in tobacco leaf epidermal cells indicated that IbDHAR3 protein is subcellular localized to chloroplast. The qRT-PCR results revealed that the relative expression level of IbDHAR3 in leaves is much higher than that in other tissues, and could be up-regulated by ABA, drought, salinity, and high-temperature stresses. The seed germination rate and root elongation were increased in contrast to wild type under mannitol and NaCl stresses in T3 transgenic Arabidopsis overexpressing IbDHAR3 gene. The soil drought experiments showed that the overexpression of IbDHAR3 gene in Arabidopsis reduced the malondialdehyde (MDA) and the H2O2 content, enhanced the level of AtGR gene expression, superoxide dismutase (SOD), ascorbate peroxidase (APX), DHAR activity, and the AsA content. Therefore, overexpression of IbDHAR3 gene could enhance the ability of scavenging reactive oxygen species such as H2O2 by promoting AsA-glutathione cycle and related antioxidant enzymes system, thereby contributing to increased stress tolerance in Arabidopsis.
A tubular linear motor structure suitable for large thrust
Wenbin Yu,Guolai Yang,Zixuan Li,Dianrong Wang,Xiuye Wang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
In response to the problem that the motor shaft of conventional tubular linear motor is prone to bending, this paper proposes a new tubular linear motor structure for large thrust demand. Bending of the motor shaft can lead to collisions between structures and affect motor performance, and traditional air-gap structures cannot effectively handle this problem. The stator of the new motor is divided into an inner and outer cylinder structure. The armature windings are arranged between the inner and outer cylinders. The permanent magnets are arranged on the motor shaft. After analysis, the structural proposed in this paper can well stop the bending of the motor shaft. It also effectively improves the problem of large fluctuations in the thrust of linear motors. Finally, it is concluded that the peak motor thrust is maximized when the material with low permeability is chosen for the inner cylinder.
Wenbin Wang,Huan Yu,김호수,Yanxin Yang,Xiangpo Qiu,곽상수 한국식물생명공학회 2019 Plant biotechnology reports Vol.13 No.3
Trehalose-6-phosphate synthase (TPS) plays an important regulatory role in the response of plants to multiple abiotic stresses. However, our knowledge of the stress tolerance functions of TPS genes in sweet potato (Ipomoea batatas [L.] Lam) remains limited. In the present study, we isolated and functionally characterized the sweet potato gene encoding TPS1, IbTPS1. Sequence analysis showed that IbTPS1 belongs to class I TPS proteins and harbors highly conserved acceptor (glucose- 6-phosphate [Glc6P]) and donor (uridine diphosphoglucose [UDP-Glc]) binding sites. The IbTPS1 gene showed the highest level of constitutive expression in leaves and storage roots of sweet potato plants and was induced by several environmental stresses including drought, salt, and heat shock. The IbTPS1 protein might be localized to the cytosol. Complementation assay of yeast tps1Δ and tps1Δtps2Δ growth-defective mutants confirmed the TPS activity of IbTPS1, and truncation of the N-terminal extension of IbTPS1 (ΔNIbTPS1) increased the catalytic activity of the protein. Additionally, expression of IbTPS1 in yeast conferred abiotic stress tolerance to dehydration, salinity, and oxidation, and expression of ΔNIbTPS1 further enhanced the tolerance to abiotic stresses. The results of this study advance our understanding of the functions of IbTPS1 under abiotic stress conditions. Our results suggest that the IbTPS1 gene is an excellent candidate for improving the stress tolerance of different crop plants.
Hou Dianyun,Wang Wenbin,Yang Mengmeng,Li Zhihong,Xu Jingya,Wang Long,Fan Zhenjie,Wang Yaoyao 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.4
Cornus officinalis is a traditional Chinese herbal medicine rich in active substances, such as iridoid glycosides, esters, polysaccharides, and tannins. C. officinalis replenishes the liver and kidney and retracts and removes phlegm. In this study, the candidate transcription factor bHLH40 from C. officinalis (CobHLH40) was predicted to be involved in iridoid glycoside biosynthesis. CobHLH40 was cloned from C. officinalis. Bioinformatics analysis was performed using the Protparatam, the ProtScale, and the SOPMA. CobHLH40 had a cDNA length of 2100 bp and a relative molecular mass of 63.32 kDa, and encoded 573 amino acids. The subcellular localization analysis indicated that CobHLH40 may be located in the nucleus. The comparison of multiple sequence alignments and phylogenetic relationships showed that the CobHLH40 was similar to the MYC2 of other plants, and that CobHLH40 had high homology with the MYC2 of Sesamum indicum. A prokaryotic expression vector was successfully constructed and transformed into the DE3 cells. The induction and expression of the fusion protein of CobHLH40 need further confirmation. The cloning and bioinformatics analysis results of CobHLH40, which may be related to iridoid glycoside synthesis, were screened and predicted for the first time on the basis of C. officinalis transcriptome sequencing. The temporal and spatial expression patterns of C. officinalis were also established. The CobHLH40 prokaryotic expression system provides a basis to further study its function.
Ji Lai Wang,Ming Wang Fu,Junxi Yu,Xing Wang,Wenbin Yang 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.10
In microforming, the quality of microparts is one of the most critical issues. Folding caused by the abnormal material flow is one of the most common flow-induced defects in macroforming process. The identified formation mechanism of flow-induced defects in macro-forming process could be affected by the so-called size effects when the part dimension is scaled down to micro scale. Therefore, it is necessary to investigate the influence of size effects on the material plastic flow and deformation behavior in multiscaled deformation scenarios. To explore the formation mechanism of flow-induced defects, FE simulation is used to simulate the forming process. On the other hand, the multi-scaled forming was designed. To study the relationship of the flow-induced defect and sizes effects, forming of the axisymmetric parts with flanged features and different scales was conducted. The microstructure and plastic flow behavior of the deformed parts are also revealed. Based on the experimental and FEM simulation results, the formation of folding defects is mainly affected by the geometries and the sizes of the deformed flanged parts instead of grain sizes. In the cases by using material with coarse grains, the folding defect can be significantly reduced.