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Wen Ran,Shaohui Lin,Garry L. Rempel,Qinmin Pan 한국고분자학회 2017 폴리머 Vol.41 No.3
Waterborne polyurethane acrylate/surface-modified γ-Al₂O₃ (WPUA/SAl₂O₃) nanocomposite films were prepared via a UV-initiated free radical photopolymerization system composed of nanocomposite emulsion, reactive diluents and a photoinitiator. To improve the compatibility of inorganic and organic phases, γ-Al₂O₃ nanoparticles were surface-modified by γ-methacryloxypropyl trimethoxysilane and combined with a WPUA matrix. The WPUA oligomer was initially prepared by step-growth polymerization, and the content of hydrophilic chain extender, dimethylolpropionic acid (DMPA) was varied to investigate its effect on the properties of the oligomer emulsion. Performance of nanocomposite films with various loadings of SAl₂O₃ was evaluated by TGA and DSC, water uptake/swelling degree, surface wettability, tensile strength and elongation at break, etc. The results revealed that thermostability of the nanocomposite film was reinforced compared with the WPUA matrix. Swelling capacity and mechanical strength were also improved due to the increase of crosslinking density. Moreover, the optimum content of DMPA for oligomer synthesis was 5%.
Robust Fixture Layout Design for a Product Family Assembled in a Multistage Reconfigurable Line
Izquierdo, L. Eduardo,Hu, S. Jack,Du, Hao,Jin, Ran,Jee, Haeseong,Shi, Jianjun ASME International 2009 Journal of Manufacturing Science and Engineering Vol.131 No.4
<P>Reconfigurable assembly systems enable a family of products to be assembled in a single system by adjusting and reconfiguring fixtures according to each product. The sharing of fixtures among different products impacts their robustness to fixture variation due to trade offs in fixture design (to allow the accommodation of the family in the single system) and to frequent reconfigurations. This paper proposes a methodology to achieve robustness of the fixture layout design through an optimal distribution of the locators in a multistation assembly system for a product family. This objective is accomplished by (1) the use of a multistation assembly process model for the product family, and (2) minimizing the combined sensitivity of the products to fixture variation. The optimization considers the feasibility of the locator layout by taking into account the constraints imposed by the different products and the processes (assembly sequence, data scheme, and reconfigurable tools’ workspace). A case study where three products are assembled in four stations is presented. The sensitivity of the optimal layout was benchmarked against the ones obtained using dedicated assembly lines for each product. This comparison demonstrates that the proposed approach does not significantly sacrifice robustness while allowing the assembly of all products in a single reconfigurable line.</P>
Yu, Keum Ran,Kim, Young Jun,Jung, Suk-Kyeong,Ku, Bonsu,Park, Hwangseo,Cho, Sa Yeon,Jung, Hyeyun,Chung, Sang J,Bae, Kwang Hee,Lee, Sang Chul,Kim, Bo Yeon,Erikson, Raymond L,Ryu, Seong Eon,Kim, Seung Ju Wiley-Blackwell 2013 Acta crystallographica. Section D, Biological crys Vol.69 No.8
<P>Unlike other classical protein tyrosine phosphatases (PTPs), PTPRQ (PTP receptor type Q) has dephosphorylating activity towards phosphatidylinositide (PI) substrates. Here, the structure of the catalytic domain of PTPRQ was solved at 1.56?? resolution. Overall, PTPRQ adopts a tertiary fold typical of other classical PTPs. However, the disordered M6 loop of PTPRQ surrounding the catalytic core and the concomitant absence of interactions of this loop with residues in the PTP loop results in a flat active-site pocket. On the basis of structural and biochemical analyses, it is proposed that this structural feature might facilitate the accommodation of large substrates, making it suitable for the dephosphorylation of PI substrates. Moreover, subsequent kinetic experiments showed that PTPRQ has a strong preferences for PI(3,4,5)P3 over other PI substrates, suggesting that its regulation of cell survival and proliferation reflects downregulation of Akt signalling.</P>
Two-Step Reset in the Resistance Switching of the Al/TiO<sub><i>x</i></sub>/Cu Structure
Shao, Xing L.,Zhao, Jin S.,Zhang, Kai L.,Chen, Ran,Sun, Kuo,Chen, Chang J.,Liu, Kai,Zhou, Li W.,Wang, Jian Y.,Ma, Chen M.,Yoon, Kyung J.,Hwang, Cheol S. American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.21
<P>Two-step reset behaviors in the resistance switching properties of the top Al/TiO<SUB><I>x</I></SUB>/bottom Cu structure were studied. During the electroforming and set steps, two types of conducting filaments composed of Cu and oxygen vacancies (Cu-CF and V<SUB>O</SUB>-CF) were simultaneously (or sequentially) formed when Al was negatively biased. In the subsequent reset step with the opposite bias polarity, the Cu-CFs ruptured first at ∼0.5 V, and formed an intermediate state. The trap-filled V<SUB>O</SUB>-CFs were transformed into a trap-empty state, resulting in a high-resistance state at ∼1 V. Matrix phase in the electrochemical metallization cell can play an active role in resistance switching.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-21/am403498q/production/images/medium/am-2013-03498q_0007.gif'></P>
Toward Global Harmonization of Derived Cloud Products
Wu, Dong L.,Baum, Bryan A.,Choi, Yong-Sang,Foster, Michael J.,Karlsson, Karl-Gö,ran,Heidinger, Andrew,Poulsen, Caroline,Pavolonis, Michael,Riedi, Jé,rô,me,Roebeling, Robert,Sherwood, St American Meteorological Society 2017 Bulletin of the American Meteorological Society Vol.98 No.2
Klein, M.V.,Liu, Ran,Salamon, D.,Cooper, S.L.,Lee, W.C.,Ginsberg, D.M.,Cheong, S.-W. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Optical absorption at the insulating gap in the parent phase of cuprate superconductors shows a broad exciton-like peak near 1.7 eV, followed by a gradual decrease in absorption persisting 1 eV above the gap. By using ultraviolet laser lines to excite Raman spectra, we have found a Raman peak 0.2 eV below the first absorption peak in insulating cuprates. The Raman peak is much narrower than the absorption peak and has A symmetry. We assign it to an exciton consisting of a hole transition from Cu dx²-y to a linear combination of Cu dxy and nearest neighbor O P orbitals. We have also studied the resonance Raman profile for two-magnon Raman scattering in the same samples. We find a sharp resonance feature at about 2.7 eV, and little Raman intensity for photon energies at the 1.7 eV absorption peak. The state created at the peak must therefore be an inappropriate intermediate state for the double spin-flip Raman process.
Klein, M.V.,Liu, Ran,Salamon, D.,Cooper, S.L.,Lee, W.C.,Ginsberg, D.M.,Cheong, S.-W. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Optical absorption at the insulating gap in the parent phase of cuprate superconductors shows a broad exciton-like peak near 1.7 eV, followed by a gradual decrease in absorption persisting 1 eV above the gap. By using ultraviolet laser lines to excite Raman spectra, we have found a Raman peak 0.2 eV below the first absorption peak in insulating cuprates. The Raman peak is much narrower than the absorption peak and has A symmetry. We assign it to an exciton consisting of a hole transition from Cu dx²-y to a linear combination of Cu dxy and nearest neighbor O P orbitals. We have also studied the resonance Raman profile for two-magnon Raman scattering in the same samples. We find a sharp resonance feature at about 2.7 eV, and little Raman intensity for photon energies at the 1.7 eV absorption peak. The state created at the peak must therefore be an inappropriate intermediate state for the double spin-flip Raman process.
Cho, Ick-Hyun,Lü,, Zhi-Rong,Yu, Jae-Ran,Park, Yong-Doo,Yang, Jun-Mo,Hahn, Myong-Joon,Zou, Fei Adenine Press 2009 Journal of biomolecular structure & dynamics Vol.27 No.3
<P>The overexpression of a single tyrosinase gene can induce conspicuous pigmentation in nonpigmented cells. We hypothesized that some unknown tyrosinase-associated genes are simultaneously regulated by melanin synthesis. To improve understanding of melanogenesis and tyrosinase-associated functions, we attempted to profile the genes that are altered during melanin production in HEK293 cells by using a functional DNA chip microarray. The candidate genes were obtained based on significance analysis of microarray (SAM) and further computational prediction via protein-protein interaction (PPI) mapping suggested that newly detected hub genes were involved in melanogenesis. PPI mapping using bioinformatic tools revealed 8 genes that formed an interaction hub. The yeast two-hybridization results suggested some candidate genes could interact with tyrosinase. The present study provides information to further understand the complex factors associated with tyrosinase-induced melanogenesis and apoptosis. The approach of combining expression data analysis and predicted protein interaction partners can help identify genes involved in pigmentation.</P>