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Junpeng Yang,Qi Cai,Yongchang Liu,Chong Li,Zongqing Ma,Huijun Li 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The W-modifi ed Ti 2 AlNb-based alloys synthesized at 1100 °C by spark plasma sintering were solution treated at 1300 °Cfor 4 h and then aged at 800–1000 °C for 1 h. The phase composition, microstructure evolution, and microhardness of theaged alloys are investigated in this study. A signifi cant enhancement of hardness, ~ 750 HV, is obtained in the alloy aged at900 °C, while that of the one without W addition is only ~ 470 HV. The hardness is also higher than that of common β-Ti andTi–6Al–4V alloys. As the ageing temperature increases, the B2/O structure evolves from B2 + O colonies to Widmannstättenstructure, followed by a “disordering to ordering” procedure. This process also involves the variation of the angle betweenadjacent O phase from 90° to 60°. Specifi cally, a herringbone Widmannstätten B2 + O structure is constructed in the alloysaged in the α 2 + B2 + O phase region, which is related to the diff usion of W and the substitution of W for Nb in the latticeof B2 or O.
An Accurate Identification of Extended XML Tree Pattern for XQuery Language
Husheng Liao,Xiaoqing Li,Junpeng Chen 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.5
In order to utilize high-performance XML tree pattern query (TPQ) for implementing of XQuery language effectively, it is necessary to analysis the query plan and identify tree pattern from it. In this paper, we extend the functional intermediate language FXQL, which is used to implement XQuery language, with an extended XML generalized tree pattern representation (GTP++). Then, we propose an XML tree pattern identification approach, which is composed of a suit of query expression rewriting rules for extracting tree pattern and a GTP++ construction algorithm. Based on this approach, both explicit and implied propositional logic, various structural constraints and predicates can be extracted across nested query blocks in XQuery FLWOR expressions. The tree pattern identified by this approach is more holistic and precisely than previous methods. The approach expands the application of XML tree pattern query technology in the implementation of XQuery language. Experiments show its effectiveness and practicability.
Xue, Junpeng,Li, Hongping,Noh, Hyeon Mi,Choi, Byung Chun,Park, Sung Heum,Jeong, Jung Hyun,Kim, Jung Hwan Elsevier 2018 Journal of luminescence Vol.202 No.-
<P><B>Abstract</B></P> <P>A series of the Eu<SUP>3+</SUP>-activated Gd<SUB>2</SUB>W<SUB>1-<I>x</I> </SUB>Mo<SUB> <I>x</I> </SUB>O<SUB>6</SUB> phosphors were synthesized by a high-temperature solid-state reaction method. The phase composition, ultraviolet-visible diffuse reflectance spectra, photoluminescence and decay properties of the phosphors were investigated. Through adjusting the Mo<SUP>6+</SUP> ion concentration, the excitation band of the studied sample was gradually shifted to longer wavelength. Under 376 nm excitation, the strong red emission at 610 nm and weak yellow emission centered at 591 nm were detected, indicating that Eu<SUP>3+</SUP> occupies non-inversion symmetry sites in the host lattices. With elevating the dopant concentration, the emission intensity of synthesized products was greatly enhanced and achieved its optimum value when <I>x</I> = 0.95 which was 2.33 times higher than that of the Gd<SUB>2</SUB>WO<SUB>6</SUB>:Eu<SUP>3+</SUP> compounds. The quantum efficiency of resultant samples was as high as 76.1%. Moreover, the Judd-Oflet theory was used to study the local structure environment behaviors of the Eu<SUP>3+</SUP> ions in the host lattices. Finally, a red LED device, which consisted of a near-ultraviolet chip and prepared Gd<SUB>2</SUB>W<SUB>0.05</SUB>Mo<SUB>0.95</SUB>O<SUB>6</SUB>:Eu<SUP>3+</SUP> phosphors, was successfully fabricated. These results confirmed that the Eu<SUP>3+</SUP>-doped Gd<SUB>2</SUB>W<SUB>1-<I>x</I> </SUB>Mo<SUB> <I>x</I> </SUB>O<SUB>6</SUB> phosphors have potential value as the red component for WLEDs.</P>
Xiang Yaoxian,Dai Junxi,Li Yao,You Zongqi,Zhang Junpeng,Huang Xinying,Nie Shuqi,Chen Yujie,Xu Lei,Liu Fengming,Jiang Junjian,Xu Jianguang 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Neutrophils are the earliest master inflammatory regulator cells recruited to target tissues after direct infection or injury. Although inflammatory factors are present in muscle that has been indirectly disturbed by peripheral nerve injury, whether neutrophils are present and play a role in the associated inflammatory process remains unclear. Here, intravital imaging analysis using spinning-disk confocal intravital microscopy was employed to dynamically identify neutrophils in denervated muscle. Slice digital scanning and 3D-view reconstruction analyses demonstrated that neutrophils escape from vessels and migrate into denervated muscle tissue. Analyses using reactive oxygen species (ROS) inhibitors and flow cytometry demonstrated that enhanced ROS activate neutrophils after denervation. Transcriptome analysis revealed that the vast majority of neutrophils in denervated muscle were of the CXCR2 subtype and were recruited by CXCL1. Most of these cells gradually disappeared within 1 week via P53-mediated apoptosis. Experiments using specific blockers confirmed that neutrophils slow the process of denervated muscle atrophy. Collectively, these results indicate that activated neutrophils are recruited via chemotaxis to muscle tissue that has been indirectly damaged by denervation, where they function in delaying atrophy.
Numerical study on CMT boron replenishment strategy for an AP1000 nuclear power unit
Hong Wang,Miao Zhang,Jialong Li,Junpeng Wang 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
The passive safety system is adopted in an AP1000 nuclear power unit to improve the operation safety ofthe whole unit. However, due to boron diffusion and periodic sampling, boron dilution occurs in the coremakeup tank. The boron replenishment process in the core makeup tank is essential and becomesparticularly important. Based on the validated models, this article numerically investigates the influenceof the replenishment flow rate and the position on the boron distribution in the core makeup tank. Thethermal fatigue phenomenon of the “T” connection caused by replenishment is analyzed. Finally, thereplenishment strategy is proposed to benefit both boron mixing in the core makeup tank and eliminating the thermal fatigue of the “T” connection
GETACHEW ALEMU,MINGKUI WANG,BINGYAN ZHANG,JUNPENG LI,XIAOBAO XU,JIN CUI,YAN SHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
The power conversion e±ciency of p-type dye-sensitized solar cells (DSSC) is determined by thekinetics of hole injection and dye-regeneration reaction at the dye/electrolyte interface. In thiswork, the photochemical regeneration kinetics of dye adsorbed on CuCrO 2 mesoporous ¯lm wasinvestigated by using scanning electrochemical microscopy with feedback mode. Organic P1 andC343 sensitizers in combination with iodide-based and thiolate-based electrolytes were selected tounderstand the e®ect of sensitizers and redox shuttles on dye-regeneration process. A fast re-generation kinetic rate constant was con¯rmed in thiolate-based sample compared with iodide-based electrolyte, indicating that the organic redox shuttle was an e±cient mediator to optimizethe performance of p-type DSSC.