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  • 1
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    Grain refinement of 2Mn-0.1C steel by repetitive heat treatment and recrystallization (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-08-08
    Description: Grain refinement in metals is well-known as one of the most effective methods to enhance their strength without addition of other elements. In this study, repetitive heat treatment combined with subsequent cold-rolling and recrystallization were investigated to obtain ultrafine-grained ferrite. Ultrafine-grained (UFG) ferritic structure having a mean grain size smaller than 1 ?m was fabricated by repetitive heat treatment at 810 ?C for 180 s and cold rolling by 90% plus a recrystallization heat treatment at 600 ?C. Starting from this UFG ferrite, finegrained dual phase (DP) steel composed of ferrite and martensite phases with grain sizes smaller than 3 pm could be also obtained by intercritical heat treatment at 740 ?C for 30 minutes followed by water-quenching. The mechanical properties of the ultrafine-grained ferritic and DP structured specimens were evaluated by tensile test. Results of the tensile test showed that finegrained ferritic and DP structures had higher yield and t...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Wafer-scale growth of single-crystal monolayer graphene on reusable hydrogen-terminated germanium (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-04-05
    Description: The uniform growth of single-crystal graphene over wafer-scale areas remains a challenge in the commercial-level manufacturability of various electronic, photonic, mechanical, and other devices based on graphene. Here, we describe wafer-scale growth of wrinkle-free single-crystal monolayer graphene on silicon wafer using a hydrogen-terminated germanium buffer layer. The anisotropic twofold symmetry of the germanium (110) surface allowed unidirectional alignment of multiple seeds, which were merged to uniform single-crystal graphene with predefined orientation. Furthermore, the weak interaction between graphene and underlying hydrogen-terminated germanium surface enabled the facile etch-free dry transfer of graphene and the recycling of the germanium substrate for continual graphene growth.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Jae-Hyun -- Lee, Eun Kyung -- Joo, Won-Jae -- Jang, Yamujin -- Kim, Byung-Sung -- Lim, Jae Young -- Choi, Soon-Hyung -- Ahn, Sung Joon -- Ahn, Joung Real -- Park, Min-Ho -- Yang, Cheol-Woong -- Choi, Byoung Lyong -- Hwang, Sung-Woo -- Whang, Dongmok -- New York, N.Y. -- Science. 2014 Apr 18;344(6181):286-9. doi: 10.1126/science.1252268. Epub 2014 Apr 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon 440-746, Korea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24700471" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Glutathione peroxidase 1 deficiency attenuates concanavalin A-induced hepatic injury by modulation of T-cell activation (2016)
    Springer Nature
    Details
    Publication Date: 2016-04-29
    Description: Glutathione peroxidase 1 deficiency attenuates concanavalin A-induced hepatic injury by modulation of T-cell activation Cell Death and Disease 7, e2208 (April 2016). doi:10.1038/cddis.2016.95 Authors: D H Lee, D J Son, M H Park, D Y Yoon, S B Han & J T Hong
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 4
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    Physical Approach to Ferroelectric Impedance Spectroscopy: The Rayleigh Element (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-12-04
    Description: Author(s): T. Schenk, M. Hoffmann, M. Pešić, M. H. Park, C. Richter, U. Schroeder, and T. Mikolajick Impedance spectroscopy is one of the most powerful characterization techniques available for research on dielectric materials. For the important class of ferroelectric materials, however, this method is seldom applied, as it currently has no solid foundation related to the physics of ferroelectrics. To solve this critical problem, the authors derive an equivalent circuit element from the Rayleigh law of irreversible domain-wall motion, which allows one to interpret ferroelectric impedance spectra physically. In proof of principle, this approach is successfully applied to a Si:HfO 2 thin film. [Phys. Rev. Applied 10, 064004] Published Mon Dec 03, 2018
    Electronic ISSN: 2331-7019
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Probing graphene grain boundaries with optical microscopy (2012)
    Nature Publishing Group (NPG)
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    Publication Date: 2012-10-05
    Description: Grain boundaries in graphene are formed by the joining of islands during the initial growth stage, and these boundaries govern transport properties and related device performance. Although information on the atomic rearrangement at graphene grain boundaries can be obtained using transmission electron microscopy and scanning tunnelling microscopy, large-scale information regarding the distribution of graphene grain boundaries is not easily accessible. Here we use optical microscopy to observe the grain boundaries of large-area graphene (grown on copper foil) directly, without transfer of the graphene. This imaging technique was realized by selectively oxidizing the underlying copper foil through graphene grain boundaries functionalized with O and OH radicals generated by ultraviolet irradiation under moisture-rich ambient conditions: selective diffusion of oxygen radicals through OH-functionalized defect sites was demonstrated by density functional calculations. The sheet resistance of large-area graphene decreased as the graphene grain sizes increased, but no strong correlation with the grain size of the copper was revealed, in contrast to a previous report. Furthermore, the influence of graphene grain boundaries on crack propagation (initialized by bending) and termination was clearly visualized using our technique. Our approach can be used as a simple protocol for evaluating the grain boundaries of other two-dimensional layered structures, such as boron nitride and exfoliated clays.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Duong, Dinh Loc -- Han, Gang Hee -- Lee, Seung Mi -- Gunes, Fethullah -- Kim, Eun Sung -- Kim, Sung Tae -- Kim, Heetae -- Ta, Quang Huy -- So, Kang Pyo -- Yoon, Seok Jun -- Chae, Seung Jin -- Jo, Young Woo -- Park, Min Ho -- Chae, Sang Hoon -- Lim, Seong Chu -- Choi, Jae Young -- Lee, Young Hee -- England -- Nature. 2012 Oct 11;490(7419):235-9. doi: 10.1038/nature11562. Epub 2012 Oct 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, South Korea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23034653" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 6
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    Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-01-20
    Description: Organic-inorganic hybrid perovskites are emerging low-cost emitters with very high color purity, but their low luminescent efficiency is a critical drawback. We boosted the current efficiency (CE) of perovskite light-emitting diodes with a simple bilayer structure to 42.9 candela per ampere, similar to the CE of phosphorescent organic light-emitting diodes, with two modifications: We prevented the formation of metallic lead (Pb) atoms that cause strong exciton quenching through a small increase in methylammonium bromide (MABr) molar proportion, and we spatially confined the exciton in uniform MAPbBr3 nanograins (average diameter = 99.7 nanometers) formed by a nanocrystal pinning process and concomitant reduction of exciton diffusion length to 67 nanometers. These changes caused substantial increases in steady-state photoluminescence intensity and efficiency of MAPbBr3 nanograin layers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cho, Himchan -- Jeong, Su-Hun -- Park, Min-Ho -- Kim, Young-Hoon -- Wolf, Christoph -- Lee, Chang-Lyoul -- Heo, Jin Hyuck -- Sadhanala, Aditya -- Myoung, NoSoung -- Yoo, Seunghyup -- Im, Sang Hyuk -- Friend, Richard H -- Lee, Tae-Woo -- New York, N.Y. -- Science. 2015 Dec 4;350(6265):1222-5. doi: 10.1126/science.aad1818. Epub 2015 Dec 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of Korea. ; Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea. ; Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1 Seochon-dong, Giheung-gu, Youngin-si, Gyeonggi-do 446-701, Republic of Korea. ; Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK. ; Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea. ; Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Pohang, Gyungbuk 790-784, Republic of Korea. Department of Chemical Engineering, Division of Advanced Materials Science, School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 790-784, Republic of Korea. twlee@postech.ac.kr taewlees@gmail.com.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26785482" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Cyclic nature of lamination in the Tithonian Solnhofen Plattenkalk of southern Germany and its palaeoclimatic implications (2001)
    Springer
    Details
    Publication Date: 2001-11-01
    Print ISSN: 1437-3254
    Electronic ISSN: 1437-3262
    Topics: Geosciences
    Published by Springer
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  • 8
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    (Table 1) Age determination of sediment core SO75-26KL
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age, 14C AMS; Age, 14C milieu/reservoir corrected (-400 yr); Age, dated; Age, dated, error to older; Age, dated, error to younger; Age, dated material; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Individuals; KL; off Portugal; Piston corer (BGR type); Sample code/label; SO75/3; SO75/3_26KL; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 149 data points
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  • 9
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    (Table 2) Chronostratigraphic control points for sediment core SO75-26KL
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age model; Datum level; DEPTH, sediment/rock; KL; off Portugal; Piston corer (BGR type); Reference/source; SO75/3; SO75/3_26KL; Sonne; Transfer function AOF13 (Kipp, 1975, Geol Soc Am Mem 145:3-41)
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 10
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    Age determination of sediment core SO75-26KL, Portuguese margin
    PANGAEA
    In:  Supplement to: Zahn, Rainer; Schönfeld, Joachim; Kudrass, Hermann-Rudolph; Park, M-H; Erlenkeuser, Helmut; Grootes, Pieter Meiert (1997): Thermohaline instability in the North Atlantic during meltwater events: Stable isotope and ice-rafted detritus records from core SO75-26KL, Portuguese margin. Paleoceanography, 12(5), 696-710, https://doi.org/10.1029/97PA00581
    Details
    Publication Date: 2023-06-27
    Description: A benthic isotope record has been measured for core SO75-26KL from the upper Portuguese margin (1099 m water depth) to monitor the response of thermohaline overturn in the North Atlantic during Heinrich events. Evaluating benthic delta18O in TS diagrams in conjunction with equilibrium deltac fractionation implies that advection of Mediterranean outflow water (MOW) to the upper Portuguese margin was significantly reduced during the last glacial (〈 15% compared to 30% today). The benthic isotope record along core SO75-26KL therefore primarily monitors variability of glacial North Atlantic conveyor circulation. The 14C-accelerator mass spectrometry ages of 13.54±.07 and 20.46±.12 ka for two ice-rafted detritus (IRD) layers in the upper core section and an interpolated age of 36.1 ka for a third IRD layer deeper in the core are in the range of published 14C ages for Heinrich events H1, H2, and H4. Marked depletion of benthic delta13C by 0.7-1.1 per mil during the Heinrich events suggests reduced thermohaline overturn in the North Atlantic during these events. Close similarity between meltwater patterns (inferred from planktonic delta18O) at Site 609 and ventilation patterns (inferred from benthic delta13C) in core SO75-26KL implies coupling between thermohaline overturn and surface forcing, as is also suggested by ocean circulation models. Benthic delta13C starts to decrease 1.5-2.5 kyr before Heinrich events Hl and H4, fully increased values are reached 1.5-3 kyr after the events, indicating a successive slowdown of thermohaline circulation well before the events and resumption of the conveyor's full strength well after the events. Benthic delta13C changes in the course of the Heinrich events show subtle maxima and minima suggesting oscillatory behavior of thermohaline circulation, a distinct feature of thermohaline instability in numerical models. Inferrred gradual spin-up of thermohaline circulation after Hl and H4 is in contrast to abrupt wanning in the North Atlantic region that is indicated by sudden increases in Greenland ice core delta18O and in marine faunal records from the northern North Atlantic. From this we infer that thermohaline circulation can explain only in part the rapid climatic oscillations seen in glacial sections of the Greenland ice core record.
    Keywords: KL; off Portugal; Piston corer (BGR type); SO75/3; SO75/3_26KL; Sonne
    Type: Dataset
    Format: application/zip, 2 datasets
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