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Development of the Beamline Front End at the Pohang Light Source(PLS)-II
Myeongjin Kim,Chasun Lee,Seonghan Kim,Hiseob Kim,Chungil Ryu,Induk Seo,Seungnam Kim 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.8
The third-generation synchrotron radiation accelerator has been providing beams to users since 1995 and have been made to upgrade the performances of the accelerators and the experimental devices. For that reason, the PLS-II was started in 2009 as a three-year project. An important feature is the extension of the ID (insertion device) beamline and the ecient placement of the storage ring magnet structure. The overall structure of the beamline as well as the length and structure of the front end had to be changed to expand the ID beamline. Also, the safety of many vacuum parts that would be exposed to the large heat due to the increase in the beam energy was rstly considered in the design, and an analysis was performed in parallel. This paper describes the overall structure of the front end, including the design and analysis of the vacuum components in the Pohang Light Source(PLS)-II beamline.
Kim, Myeongjin,Kim, Jooheon American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.12
<P>Silicon carbide microsphere/birnessite-type MnO<SUB><I>x</I></SUB> (SiC/B-MnO<SUB><I>x</I></SUB>) composites were prepared by removal of a SiO<SUB>2</SUB> layer with redox deposition of birnessite-type MnO<SUB><I>x</I></SUB> for supercapacitor electrode materials. The characterization studies showed that the birnessite-type MnO<SUB><I>x</I></SUB> in the composite was homogeneously deposited on the SiC surface. The capacitive properties of the as-prepared SiC/B-MnO<SUB><I>x</I></SUB> electrodes were measured in a three-electrode system using 1 M Na<SUB>2</SUB>SO<SUB>4</SUB>(aq) as the electrolyte. The SiC/B-MnO<SUB><I>x</I></SUB>(6) electrode, fabricated using a MnO<SUB><I>x</I></SUB>/SiC feeding ratio of 6:1, displayed a specific capacitance of 251.3 F g<SUP>–1</SUP> at 10 mV s<SUP>–1</SUP>. Such excellent electrochemical performance is attributed to an increase in the electrical conductivity in the presence of silicon carbide, an increase in the effective interfacial area between MnO<SUB><I>x</I></SUB> and the electrolyte, and the contact area between MnO<SUB><I>x</I></SUB> and silicon carbide. The deposition of birnessite-type MnO<SUB><I>x</I></SUB> on a SiC surface may be a prospective fabrication technique for electrode materials for supercapacitors.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-12/am406032y/production/images/medium/am-2013-06032y_0011.gif'></P>
Myeongjin Kim,Seulgi Mun,Mi Young Noh,Yasuyuki Arakane 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Insect cuticle consists of numerous structural proteins, which could interact with polysaccharide, chitin, and alter properly mechanical property of the cuticle. Cuticular Protein Analogous to Peritrophins (CPAPs) are characterized by presence of one (CPAP1s) or three (CPAP3s) chitin-binding domain belong to CBM14/ChtBD2 family. In this study, we investigated physiological functions of TcCPAP1-H and TcCPAP3-C in Tribolium castaneum. RNAi for either TcCPAP1-H or TcCPAP3-C at late instar larvae had no effect on larval-pupal molt nor pupal development. However, the resulting pharate adults failed to shed their old pupal cuticle and died entrapped in it without undergoing eclosion. TEM analysis, in addition, revealed disorganized chitinous horizontal laminae and/or vertical pore canals of rigid cuticle from TcCPAP1-H- and TcCPAP3-C-deficient adults. Desiccation-induced death produced by injection of dsTcCPAP1-H into young instar larvae is also discussed.
Kim, Myeongjin,Mergu, Naveen,Son, Young-A. Elsevier 2018 Journal of luminescence Vol.204 No.-
<P><B>Abstract</B></P> <P>A novel imidazole-functionalized receptor, <B>M</B>, containing anthraquinone as a signaling unit was synthesized and characterized. Its potential application to detect CN⁻ and F⁻ ions in DMSO was investigated using UV–Vis and fluorescence spectroscopy. A color change and bathochromic shift corresponding to the intramolecular charge transfer (ICT) transition in the absorption spectra were observed upon addition of CN⁻ and F⁻ ions. Fluorescence enhancement and quenching at 532 and 581 nm, respectively, were observed in the emission spectra of <B>M</B> upon addition of CN⁻ and F⁻. The receptor senses cyanide and fluoride via the deprotonation of the imidazole N-H unit, which was further confirmed by <SUP>1</SUP>H NMR. For practical applications, electrospun nanofiber test strips of <B>M</B> were successfully used to recognize CN⁻ and F⁻ in aqueous media. The reversibility of the deprotonation of the imidazole N-H was successfully examined through treatment with Cu<SUP>2+</SUP> ions.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Myeongjin,Oh, Ilgeun,Ju, Hyun,Kim, Jooheon The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.13
<P>In this work, a three-dimensional hierarchical carbon framework/Co3O4 hybrid composite was fabricated. The three-dimensional hierarchical carbon framework was constructed by thermal vapor deposition on the silica nanosphere templates and etching these templates. The resulting carbon framework was activated using phosphoric acid to control its surface area and porosity. The degree of activation of the carbon framework was optimized by measuring the specific capacitance. The carbon framework electrode activated with 3 M phosphoric acid (HCCA(3)) exhibited the highest specific capacitance (134 F g(-1) at 10 mV s(-1)). Subsequently, Co3O4 was formed on the carbon framework via the hydrothermal method. The resulting product HCCA(3)/Co3O4 showed a dramatic enhancement in the specific capacitance (456 F g(-1) at 1 A g(-1)) compared with the pristine Co3O4 and HCCA(3) electrodes. The proposed HCCA(3)/Co3O4 composite can be used for the fabrication of high-performance electrodes.</P>