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Xiaojie Chen,Anhuai Xu,Likun Ai,Ming Qi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
InGaAs/InP materials and p-i-n/HBT structural materials for a monolithic opto-electronic integrated circuit (OEIC) receiver were grown on (100) oriented semiinsulating InP substrates by a V90 gas source molecular beam epitaxy (GSMBE) system. High-quality lattice-matched InGaAs/InP hetero epi-layers were demonstrated through optimizing the growth conditions. Both carbon (C) and beryllium (Be) are used in experiments on InGaAs heavy ptype doping. Some preliminary results for nGaAs/InP hetero epilayer and the prototype InGaAs/InP HBT junction performance are reported.
A Novel Double Layer Cantilevers Harvester for Vibration Energy
Chen Xiaojie,Qiu Chengjun,Qu Wei,Liu Yibo,Xia Hongyang 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8
This paper reported a double layer cantilever harvester powered for vibration energy. A space layer between the PZT beam and the support silicon beam is existed, leading to the double layer cantilever structure. Such structure can allow the more strain generated by the piezoelectric layer due to the existing of space layer, and the output voltage is further increased. The formula of output voltage is then derived from the piezoelectric effect equation and vibration model. And the formula verifies the relationship of voltage and structure parameter. And the simulation in micrometer lever is used to discuss the relationship. Finally, the prototype is assembled and measured to verify the feature of the device. Experimentally, the 3.8V output voltage and 16.9uW output power is acquired.
IL-6-miR-210 Suppresses Regulatory T Cell Function and Promotes Atrial Fibrosis by Targeting Foxp3
Chen, YingWei,Chang, GuoDong,Chen, XiaoJie,Li, YunPeng,Li, HaiYu,Cheng, Dong,Tang, Yi,Sang, HaiQiang Korean Society for Molecular and Cellular Biology 2020 Molecules and cells Vol.43 No.5
The aim of this study was to explore the role of IL-6-miR-210 in the regulation of Tregs function and atrial fibrosis in atrial fibrillation (AF). The levels of interleukin (IL)-6 and IL-10 in AF patients were detected by using ELISA. Proportions of Treg cells were detected by fluorescence activated cell sorting analysis in AF patients. The expression of Foxp3, α-SMA, collagen I and collagen III were determined by western blot. The atrial mechanocytes were authenticated by vimentin immunostaining. The expression of miR-210 was performed by quantitative real-time polymerase chain reaction (qRT-PCR). TargetScan was used to predict potential targets of miR-210. The cardiomyocyte transverse sections in AF model group were observed by H&E staining. The myocardial filaments were observed by masson staining. The level of IL-6 was highly increased while the level of IL-10 (Tregs) was significantly decreased in AF patients as compared to normal control subjects, and IL-6 suppressed Tregs function and promoted the expression of α-SMA, collagen I and collagen III. Furthermore, miR-210 regulated Tregs function by targeting Foxp3, and IL-6 promoted expression of miR-210 via regulating hypoxia inducible factor-1α (HIF-1α). IL-6-miR-210 suppresses regulatory T cell function and promotes atrial fibrosis by targeting Foxp3.
Crystal structure of the N-terminal domain of Candida glabrata Hsp90
Lingchen Tan,Xiaojie Li,Gongchun Zhang,Lin Chen,Young Jun Im 한국구조생물학회 2024 Biodesign Vol.12 No.2
Hsp90 is a molecular chaperone that promotes protein folding and maturation of various client proteins. In this study, we purified Candida glabrata Hsp90 and crystallized the protein in 100 mM HEPES-NaOH pH7.5, 70% 2-methyl-2,4- pentanediol. We collected the x-ray diffraction data to 1.9 Å resolution. The crystals belong to the space group P4322 with unit cell parameters a = b = 73.9 Å, and c = 108.7 Å. Solvent content analysis suggested that a proteolytic fragment of the full-length formed the crystals. We determined the structure of the ATP-binding N-terminal domain (NTD) by molecular replacement using a structure of S. cerevisiae Hsc82. The asymmetric unit contained one NTD with a solvent content of 59.5%. The structure of CgHsp90 NTD spanning the residues 2-212 was refined to the Rfree factor of 22.7%. The structure reveals an open conformation of the nucleotide-binding site and structural conservation of the NTDs in fungal Hsp90 proteins.
Zheng Gong,Peng Dai,Xiaojie Wu,Fujin Deng,Dong Liu,Zhe Chen 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
In recent years, voltage source multilevel converters are very popular in medium/high-voltage industrial applications, among which the NPC/H-Bridge converter is a popular solution to the medium/high-voltage drive systems. The conventional finite control set model predictive control (FCS-MPC) strategy is not practical for multilevel converters due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a hierarchical model predictive voltage control (HMPVC) strategy with referring to the implementation of g-h coordinate space vector modulation (SVM) is proposed. By the hierarchical structure of different cost functions, load currents can be controlled well and common mode voltage can be maintained at low values. The proposed strategy could be easily expanded to the systems with high number of voltage levels while the amount of required calculation is significantly reduced and the advantages of the conventional FCS-MPC strategy are reserved. In addition, a HMPVC-based field oriented control scheme is applied to a drive system with the NPC/H-Bridge converter. Both steady-state and transient performances are evaluated by simulations and experiments with a down-scaled NPC/H-Bridge converter prototype under various conditions, which validate the proposed HMPVC strategy.
Zhongyao Zhang,Xiaopeng Chen,Jiezhen Liang,Xiaojie Wei,Kaixi Deng,Jiezhong Zou,Linlin Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
The petrol-based random copolymer, e.g., aromatic-hydrocarbon resin, is widely used in industrial production,but the research about its gas–liquid two flow is far from being solved. Herein, the formation,motion, and deformation of a single bubble in six different concentrations of random copolymer solutionswere systemically investigated using high-speed photography (1000 fps), combined with digital imageprocessing technology. The departure time of the bubble first decreases and then increases, and maximumof aspect ratio and specific surface area reduce as the proportion of solute increases. The bubbledeparture time decreases and bubble size increases with viscous force increases in the case of same surfacetension. Based on force balance analysis, added mass force is one of the prime reasons to affect bubbleoscillation during the acceleration phase after bubble detachment, whereas the effect of added massforce decreases as solute increases or as the bubble reaches stability zone. Also, velocity, drag coefficientand aspect ratio of bubble were discussed in detail by dimensionless analysis. Furthermore, three newshape numerical models (based on We, Ta, and WeEo, respectively) were proposed, which allowed for satisfactorypredictions, and new correlations represent well the experimental data in a wider range of Monumbers from the mentioned literature (11.6 logMo 0.63).
Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow
Lulu Zheng,Xiaoping Chen,Wei Zhang,Zu-chao Zhu,Jinglei Qu,Mengmeng Wang,Xiaojie Ma,Xueli Cheng 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.9
Clearance flow has great impact on pressure fluctuation of centrifugal pumps. Numerical calculations are performed to study the pressure fluctuation characteristics of centrifugal pump with wear ring clearance, especially in the regions of interaction between main flow and clearance flow (IMC) and clearance. The accuracy of numerical calculations is illustrated by comparing the experiments of performance and pressure fluctuation. Results show that, in clearance region the pressure fluctuation is still governed by blade passing frequency (f BPF ). Its amplitude of dominate frequency of pressure fluctuation becomes larger as the probe approaches the impeller exit. In IMC region, the pressure fluctuation at impeller outlet is dominated by f BPF . However, the dominate frequency at the entrance of impeller is less than f BPF . In addition, as the flow rate increased, the amplitude of dominate frequency of pressure fluctuation increases at impeller entrance, whereas an inverse trend is observed at wear ring clearance region.
Gong, Zheng,Dai, Peng,Wu, Xiaojie,Deng, Fujin,Liu, Dong,Chen, Zhe The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
In recent years, voltage source multilevel converters are very popular in medium/high-voltage industrial applications, among which the NPC/H-Bridge converter is a popular solution to the medium/high-voltage drive systems. The conventional finite control set model predictive control (FCS-MPC) strategy is not practical for multilevel converters due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a hierarchical model predictive voltage control (HMPVC) strategy with referring to the implementation of g-h coordinate space vector modulation (SVM) is proposed. By the hierarchical structure of different cost functions, load currents can be controlled well and common mode voltage can be maintained at low values. The proposed strategy could be easily expanded to the systems with high number of voltage levels while the amount of required calculation is significantly reduced and the advantages of the conventional FCS-MPC strategy are reserved. In addition, a HMPVC-based field oriented control scheme is applied to a drive system with the NPC/H-Bridge converter. Both steady-state and transient performances are evaluated by simulations and experiments with a down-scaled NPC/H-Bridge converter prototype under various conditions, which validate the proposed HMPVC strategy.