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Relevant bibliographies by topics / Amorphous graphite

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Academic literature on the topic 'Amorphous graphite'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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Journal articles on the topic "Amorphous graphite"

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Belonogov, Evgeny K., Sergey B. Kushev, Sergey A. Soldatenko, and Tatiana L. Turaeva. "Morphology and structure characteristics of nanoscale carbon materials containing graphene." Image Journal of Advanced Materials and Technologies 6, no. 4 (2021): 247–55. http://dx.doi.org/10.17277/jamt.2021.04.pp.247-255.

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A comprehensive study of the nanostructured powders (graphite GSM-2; Taunit-M; thermally expanded graphite (TEG)) by methods of transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffractometry (XRD), reflection high-energy electron diffraction (RHEED), Raman spectroscopy, was carried out. The experimental XRD halo was interpreted by superimposing theoretical diffraction maxima, and an X-ray amorphous graphite phase was revealed. It was found that the X-ray amorphous phase is characterized by the limiting degree of graphite nanostructuring. From the width of the

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Zhang, Bin, Li Qiang, Xiao Ling, and Jun Yan Zhang. "Impacts of N2 Import into Reaction System on the Structures and Properties of the Graphite-Amorphous Carbon Films." Advanced Materials Research 750-752 (August 2013): 1924–29. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1924.

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Graphite-amorphous carbon films were grown by sputtered Ni target in Ar/CH4 mixture atmosphere. The impacts of N2 import into reaction system on the structures and properties of the graphite-amorphous carbon films were studied. The results shown that graphite-amorphous carbon films with good hardness, elastic and friction coefficient were obtained at the N2/CH4 flow ratio below 20/80. Beyond the flow ratio of 20/80, the number and size of nanocrystal graphite decrease induce the bad hardness, elastic and friction coefficient of the graphite-amorphous films. Graphite-amorphous carbon films prop

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Liu, Zhi Guo. "Effect of Heating Temperature of Expandable Graphite on Amorphous Process of Expanded Graphite/Ni System during Ball Milling." Applied Mechanics and Materials 80-81 (July 2011): 233–36. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.233.

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Two expanded graphites, EG1 and EG2 that were prepared by rapid heating expandable graphite to 600 and 1000 °C, respectively, were ball milled in a high-energy mill under an air atmosphere with 16.7% nickel addition. The X-ray diffraction patterns of the products show that that increasing the heating temperature of expandable graphite accelerates the amorphous process of the EG-Ni systems during the milling process. Ball milling the EG2-Ni mixture results in the formation of an amorphous EG-Ni system and Ni3C phase. Comparing with the amorphous process of the milled EGs without nickel addition

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Wang, Jia, and Cheng Lin Liu. "Molecular Dynamics Simulation for Temperature and Graphite-Like Structure Effects on Amorphous Carbon Graphitization." Materials Science Forum 956 (June 2019): 78–86. http://dx.doi.org/10.4028/www.scientific.net/msf.956.78.

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The effects of temperature and graphite-like structure additive on the graphitization process of amorphous carbon were investigated through molecular dynamics simulation. The molecular models of amorphous carbon and graphite-like structure-amorphous carbon were constructed with the initial density of 1.62 g/cm3 and carbon atoms number of 4096 by rapid quenching method. After annealing treatment at 3200 K, 3600 K and 4000 K respectively, the evolution rules of sp2 C atoms and the instantaneous conformations of the graphite-like structure-amorphous carbon system were analyzed to investigate the

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Wang, Chao, Xi Zhang, and Dongfeng Diao. "Nanosized graphene crystallite induced strong magnetism in pure carbon films." Nanoscale 7, no. 10 (2015): 4475–81. http://dx.doi.org/10.1039/c4nr06711h.

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Pure carbon films with abundant graphene nanocrystallites (sample C) having a 2D Raman band similar to that of bilayer graphene exhibit stronger magnetism than the amorphous (A) and graphite-like structures (D).

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Ugwumadu, C., K. Nepal, R. Thapa, and D. A. Drabold. "Atomistic nature of amorphous graphite." Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B 64, no. 1 (2023): 16–22. http://dx.doi.org/10.13036/17533562.64.1.18.

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This paper focuses on the structural, electronic, and vibrational features of amorphous graphite [R. Thapa et al, Phys. Rev. Lett., 2022, 128, 236402]. The structural order in amorphous graphite is discussed and compared with graphite and amorphous carbon. The electronic density of states and localization in these phases were analyzed. Spatial projection of charge densities in the π bands showed a high charge concentration on participating atoms in connecting hexagons. A vibrational density of states was computed and is potentially an experimentally testable fingerprint of the material. An ana

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Абдуев, А. Х., А. К. Ахмедов, А. Ш. Асваров, К. Ш. Рабаданов та Р. М. Эмиров. "Образование композита ZnO-C с нанокристаллической структурой". Журнал технической физики 89, № 5 (2019): 717. http://dx.doi.org/10.21883/jtf.2019.05.47474.202-18.

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AbstractThe formation of a nanocrystalline composite of a ZnO–C system with simultaneous mechanical activation of a mixture of zinc oxide and graphite powders in a ball mill in an inert atmosphere is studied. It is shown that the presence of graphite reduces the efficiency of dispersing ZnO crystallites. The following principal dispersion mechanisms of graphite are determined: the fragmentation of particles due to the impact of grinding bodies and the exfoliation of flakes by submicron zinc oxide particles. It has been established that a composite system is formed as a result of the prolonged

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Chen, Di Chun, Bai Ling Jiang, and Ming Zhi Li. "Microstructure and Mechanical Properties of CrAlTiCN Multilayer Films by Magnetron Sputtering Ion Plating." Materials Science Forum 687 (June 2011): 699–705. http://dx.doi.org/10.4028/www.scientific.net/msf.687.699.

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CrAlTiCN multilayer films have been prepared by closed-field unbalanced magnetron sputtering technology using graphite target as the C supplier. TEM observation results show that the CrAlTiCN films have a clear multilayer structure with the modulate periods changed with the current of graphite target. The higher the current of graphite target, the thicker the periodical thickness of multilayer film. The microstructure of CrAlTiCN films is that the (Cr,Al,Ti)N/amorphous carbon multilayer where (Cr,Al,Ti)N layer and amorphous carbon layer appeared interval, the volume fraction of the amorphous c

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Zaikovskii, Alexey. "Structural Features of the Carbon Material Synthesized by Plasma-Arc Method at Low Buffer Gas Pressure." Applied Mechanics and Materials 864 (April 2017): 36–41. http://dx.doi.org/10.4028/www.scientific.net/amm.864.36.

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The carbon material was synthesized by the plasma-arc method at the buffer gas pressure of 3 Torr. The material has physical properties different from the properties of the material synthesized at pressure of 25 Torr and higher. The low pressure of buffer gas leads to formation of materials consisting of carbon nanoparticles with average size lower than 10nm. The nanoparticles have form of carbon globules, which consist of the graphite-like structure. This structure is the composition of the stacked, twisted and closed nanofragments of graphene. The dominating interlayer distance in the struct

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Anderson, P. E., and N. M. Rodriguez. "Growth of graphite nanofibers from the decomposition of CO/H2 over silica-supported iron–nickel particles." Journal of Materials Research 14, no. 7 (1999): 2912–21. http://dx.doi.org/10.1557/jmr.1999.0389.

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Extremely fine, tubular graphite nanofibers of varying geometries and degrees of crystallinity were produced by the decomposition of CO and hydrogen over various compositions of nickel–iron particles supported on silica. High-resolution transmission electron microscopy coupled with temperature programmed oxidation studies revealed that, as the iron content of the catalyst was increased, the bimetallic particles precipitated a chainlike graphitic fibrous structure in a stepwise mechanism. The high-iron-content system Fe–Ni (8:2) yielded a small amount of these chainlike graphite fibers that wer

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Dissertations / Theses on the topic "Amorphous graphite"

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Gibson, Andrew Stephen. "The electronic structure of amorphous graphite." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335747.

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Piscanec, Stefano. "Raman spectra of graphite, carbon nanotubes, silicon nanowires and amorphous carbon." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614290.

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Lee, Sang Joon. "Structure and Interaction Energies of Kr Atoms Adsorbed on Graphitic Amorphous Carbon." DigitalCommons@USU, 1995. https://digitalcommons.usu.edu/etd/2091.

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The physisorption of Kr on graphitic amorphous carbon (g-C) has been investigated using a statistical approach. The interaction energy calculation process (i) established a structural model of g-C and (ii) determined the adsorbate-adsorbate and the adsorbate-substrate interaction potentials on g-C. The structural model of g-C was divided into three regions. For the interaction potential between a Kr atom and a carbon atom the short and medium range order of g-C was described with a discrete medium model based on three ring clusters using ring statistics from Beeman's continuous random network

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Gao, Chao. "Spectral momentum densities of crystalline graphite and ion sputtered amorphous carbon films from (e,2e) spectrology." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53693.

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Кардашев, Д. Л., Е. С. Артеменко та К. Д. Кардашев. "Локальная плотность электронных состояний аморфного графена". Thesis, Сумский государственный университет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/40782.

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В настоящее время электронная структура идеального графена изучена достаточно хорошо благодаря применению разнообразных стандартных программных продуктов, использующих различные приближения и формализмы физики твердого тела. Компьютерное моделирование квантово-механических систем является по своей сути численным экспериментом, требующим контроля адекватности расчетных характеристик экспериментальным.

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Champi, Farfan Ana Melva. "Estudo das propriedades termomecânicas e estruturais de filmes finos amorfos de carbono e nitretos de carbono." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277838.

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Orientador: Francisco das Chagas Marques<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-05T00:47:21Z (GMT). No. of bitstreams: 1 ChampiFarfan_AnaMelva_D.pdf: 65229004 bytes, checksum: 98d3b8d6ecf9c395993d20730f0013f7 (MD5) Previous issue date: 2004<br>Resumo: Nesta tese estudamos a influência da incorporação de nitrogênio nas propriedades termomecânicas e estruturais em matrizes de carbono amorfo hidrogenado (a-C:H) e não hidrogenado (a-C). Duas técnicas de deposição foram utilizadas para o crescimento dos f

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Montagnac, Gilles. "Spectroscopie Raman résonnante UV in situ à haute température ou à haute pression." Thesis, Lyon, École normale supérieure, 2012. http://www.theses.fr/2012ENSL0784/document.

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Dans cette thèse, la spectroscopie Raman résonante UV (SRRUV) est appliquée pour la première fois à l'étude ‘in situ’ de matériaux carbonés à très haute température (> 2000 K) ou à haute pression (< 1 GPa).La thèse est constituée de trois parties. La première aborde notre travail de caractérisation en SRRUV (1) de films semi conducteurs de diamants ultra-nano-cristalins, (2) des kérogènes issues de météorites chondritiques et de charbons, et (3) des tholins, échantillons de carbone-hydrogène-azote, synthétisés comme analogues de l'atmosphère de Titan.L’intérêt pour ces phases du carbone

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Göhler, Fabian, Erik C. Hadland, Constance Schmidt, et al. "Growth of Nanocrystalline MoSe2 Monolayers on Epitaxial Graphene from Amorphous Precursors." Wiley-VCH Verlag, 2019. https://monarch.qucosa.de/id/qucosa%3A34072.

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A new approach to the growth of MoSe2 thin films on epitaxial graphene on SiC(0001) by the use of modulated elemental reactants (MER) precursors has been reported. The synthesis applies a two-step process, where first an amorphous precursor is deposited on the substrate which self-assembles upon annealing. Films with a nominal thickness of about 1ML are successfully grown on epitaxial graphene monolayer as well as buffer layer samples. Characterization of the films is performed using XPS, LEED, AFM, and Raman spectroscopy. The films are nanocrystalline and show randomly rotated domains. This a

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Fugaciu, Florin. "Molekulardynamische Simulation der Stabilität und Transformation von Kohlenstoff-Nanoteilchen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2000. http://nbn-resolving.de/urn:nbn:de:swb:14-994153395343-03649.

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Ziel der Arbeit ist die theoretische Analyse von Kohlenstoff-Clustern der Größe 100 - 500 Atome. Die experimentellen Beobachtungen sind bei dieser geringen Anzahl der Atome schwierig. Anderseits sind Kenntnisse über solche Cluster sehr wichtig, z.B. für die Keimbildung von Diamant auf Substraten, oder für die Kohlenstoff-Nanotechnologie (Fullerene, Nanotubes), oder für strukturelle Defekte in Kohlenstoff-Systemen. Es wurden gekrümmte Grenzflächen im Diamant simuliert. Zuerst mit einem empirischen Potential. Es wurde danach eine Methode entwickelt, bei der die schwach gestörten Gebiete einem em

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Fugaciu, Florin. "Molekulardynamische Simulation der Stabilität und Transformation von Kohlenstoff-Nanoteilchen." Doctoral thesis, Technische Universität Dresden, 1999. https://tud.qucosa.de/id/qucosa%3A24737.

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Ziel der Arbeit ist die theoretische Analyse von Kohlenstoff-Clustern der Größe 100 - 500 Atome. Die experimentellen Beobachtungen sind bei dieser geringen Anzahl der Atome schwierig. Anderseits sind Kenntnisse über solche Cluster sehr wichtig, z.B. für die Keimbildung von Diamant auf Substraten, oder für die Kohlenstoff-Nanotechnologie (Fullerene, Nanotubes), oder für strukturelle Defekte in Kohlenstoff-Systemen. Es wurden gekrümmte Grenzflächen im Diamant simuliert. Zuerst mit einem empirischen Potential. Es wurde danach eine Methode entwickelt, bei der die schwach gestörten Gebiete einem em

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Books on the topic "Amorphous graphite"

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Lemmon, John P. The synthesis and characterization of components for solid-state lithium cells: Amorphous polyether-salt complexes, planar-sheet graphite fluorides, and layered organic/inorganic nanocomposites. 1994.

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Book chapters on the topic "Amorphous graphite"

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Toyofuku, Naoki, Megumi Nishimoto, Kazuki Arayama, Yasuhiro Kodera, Manshi Ohyanagi, and Zuhair Munir. "Consolidation of Carbon with Amorphous Graphite Transformation by SPS." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470880456.ch3.

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Cambronero, L. E. G., P. Sánchez, J. M. Ruiz-Román, J. Pous, and F. A. Corpas. "Radial Crushing Strength of Bronce with Nickel-Graphite Additions." In Materials Development and Processing - Bulk Amorphous Materials, Undercooling and Powder Metallurgy. Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607277.ch51.

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Jones, A. P., W. W. Duley, and D. A. Williams. "Hydrogenated Amorphous Carbon-Coated Silicate Particles: Diamond and Graphite-Like Carbons and Interstellar Extinction." In Experiments on Cosmic Dust Analogues. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3033-9_15.

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King, Scott A., Roger A. Crawfis, and Wayland Reid. "Fast Volume Rendering and Animation of Amorphous Phenomena." In Volume Graphics. Springer London, 2000. http://dx.doi.org/10.1007/978-1-4471-0737-8_14.

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Bernhauser, E., and J. Mittag. "A Comparative Examination on Ageing of Cathodes: Amorphous Versus Graphitic Type." In Essential Readings in Light Metals. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48200-2_123.

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Bernhauser, E., and J. Mittag. "A Comparative Examination of Ageing of Cathodes: Amorphous Versus Graphitic Type." In Essential Readings in Light Metals. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118647745.ch123.

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Tsai, Yu-Jen, and Chin-Lung Kuo. "Defective and Amorphous Graphene as Anode Materials for Li-Ion Batteries." In Green Energy Materials Handbook. CRC Press, 2019. http://dx.doi.org/10.1201/9780429466281-4.

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Phan, Ha H., and Anh N. Phan. "Amorphous Carbon with a Graphitic Pattern Derived from Biomass for Supercapacitor Applications." In Biomass-Based Functional Carbon Nanostructures for Supercapacitors. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0996-4_7.

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"Amorphous and Non-Crystalline Carbons." In Graphite and Precursors. CRC Press, 2000. http://dx.doi.org/10.1201/9781482296921-19.

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Khalaj, Zahra, Majid Monajjemi, and Mircea V. Diudea. "Main Allotropes of Carbon." In Sustainable Nanosystems Development, Properties, and Applications. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0492-4.ch006.

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Carbon allotropes can be classified according to the carbon atom hybridization. In principle, there are different ways, based on various parameters, such as range dimensionality, type of chemical bonds, etc. which can be used to classify carbon nanostructures. Classifications vary function of the field of nanostructure applications. In a point of view, one can classify the carbon allotropes by the type of carbon atom hybridation. This chapter is a brief review introduction to some major allotropes: graphene/graphite, carbon nanotubes, diamond and amorphous carbon. In addition, Chemical Vapor D

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Conference papers on the topic "Amorphous graphite"

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Yamada, Yutaka, Tatsuya Ikuta, Takashi Nishiyama, Koji Takahashi, and Yasuyuki Takata. "Submicron-Scale Condensation on Hydrophobic and Hydrophilic Surfaces." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66186.

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Condensation heat transfer is a widely-used technique for industrial applications represented by heat exchanger because of its high heat transfer coefficient. To enhance its performance, a suitable surface is required, where both condensation and droplet removal smoothly occur. In this study, we compared wettability of a graphene surface and an amorphous carbon surface. The result shows that an amorphous carbon surface is more hydrophilic. Then we prepared a graphite surface which has nanoscale hydrophilic regions in large hydrophobic area. We observed the submicron-scale droplet condensation

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Sinha, K., J. Menendez, W. J. Varhue, and B. S. Shinseki. "Resonance Raman Scattering In Amorphous Carbon Films And Graphite." In OE/LASE '89, edited by Fran Adar, James E. Griffiths, and Jeremy M. Lerner. SPIE, 1989. http://dx.doi.org/10.1117/12.951585.

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Agranat, Michail B., Sergei I. Anisimov, Sergei I. Ashitkov, et al. "Production of amorphous graphite in picosecond laser interaction experiments." In High-Power Laser Ablation, edited by Claude R. Phipps. SPIE, 1998. http://dx.doi.org/10.1117/12.321517.

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Yang, K., J. Rong, Y. Zhuang, L. Wang, S. Tao, and C. Ding. "Tribological Performance of Al2O3/YAG Amorphous Ceramic Coating Fabricated by Atmospheric Plasma Spraying." In ITSC2017, edited by A. Agarwal, G. Bolelli, A. Concustell, et al. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0741.

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Abstract In this study, the spray-dried Al2O3/Y2O3 composite powder was prepared using commercially available nanosized Al2O3 and Y2O3 feedstock. The mass ratio of Al2O3 to Y2O3 was 2:1. Atmospheric plasma spraying possesses high thermal enthalpy, large temperature gradient and rapid cooling rate. The microstructure and wear resistant performance of plasma-sprayed Al2O3.Y3Al5O12 (YAG) coating were investigated. As-sprayed Al2O3.YAG coating was chiefly composed of amorphous phase, which may reveal superplastic feature in supercooled liquid region (from 503.0°C to 906.5°C). The as-sprayed Al2O3.

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Zollner, Stefan. "Birefringence and VIS/VUV optical absorption of graphite-like amorphous carbon." In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors - ICPS-27. AIP, 2005. http://dx.doi.org/10.1063/1.1994018.

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Dong, Xiangming, Shibing Liu, Haiying Song, and Song Liu. "Direct imprinting of few-layer graphene on amorphous graphite film by femtosecond laser direct write technique." In ICALEO® 2016: 35th International Congress on Applications of Lasers & Electro-Optics. Laser Institute of America, 2016. http://dx.doi.org/10.2351/1.5119068.

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Inaba, Hiroshi, Toru Matsumura, Yoko Saito, and Hiroyuki Matsumoto. "Tetrahedral Amorphous Carbon With Ultratrace Hydrogen." In ASME 2014 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/isps2014-6928.

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In heat assisted magnetic recording (HAMR) where near-field light from a head heats up a disk, disk overcoat needs to be heat-resistive and transparent. ta-C (tetrahedral amorphous carbon) films have been considered to be promising for HAMR disk overcoat, because they are denser and harder than diamond-like carbon (DLC) films that have been used as disk overcoat. In the previous study, ta-C did not show any change in the film thickness by heating up to 450 degrees Celsius, approving a heat-resistant high protective film [1]. The purpose of this study is to investigate enhanced ta-C, which is h

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Roy, Ajit K., V. Varshney, S. Ganguli, S. Sihn, J. Lee, and B. Farmer. "Atomistic Scale Thermal Transport in Amorphous Materials and Its Interfaces." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44656.

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The thermal loads (excess heat) in all DoD systems (aircrafts and spacecrafts) have steadily been increasing at an alarming rate. The current practice is use fuel as the heat sink to dump the excess heat. This operational approach currently is not adequate to sufficiently cool the electronics and thermal devices, and thus limiting the system performance and its system readiness. Amorphous materials system (polymers, adhesive, etc.), which is known to be thermally non-conductive material, is prevalent in almost all DoD systems. So, there is a big incentive in tailoring its thermal transport cha

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Chua, Daniel H. C., and Angel T. T. Koh. "Electron emission studies of nano-graphite clusters embedded in amorphous carbon films." In 8th International Vacuum Electron Sources Conference and Nanocarbon (2010 IVESC). IEEE, 2010. http://dx.doi.org/10.1109/ivesc.2010.5644369.

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Rohman, Fadli, Umi Azizah, and Bambang Prihandoko. "Study of electrochemical performance of amorphous carbon-coated graphite for Li-ion battery." In PROCEEDINGS FROM THE 14TH INTERNATIONAL SYMPOSIUM ON THERAPEUTIC ULTRASOUND. Author(s), 2017. http://dx.doi.org/10.1063/1.4978113.

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Reports on the topic "Amorphous graphite"

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Pisani, William, Dane Wedgeworth, Michael Roth, John Newman, and Manoj Shukla. Exploration of two polymer nanocomposite structure-property relationships facilitated by molecular dynamics simulation and multiscale modeling. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/46713.

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Polyamide 6 (PA6) is a semi-crystalline thermoplastic used in many engineering applications due to good strength, stiffness, mechanical damping, wear/abrasion resistance, and excellent performance-to-cost ratio. In this report, two structure-property relationships were explored. First, carbon nanotubes (CNT) and graphene (G) were used as reinforcement molecules in simulated and experimentally prepared PA6 matrices to improve the overall mechanical properties. Molecular dynamics (MD) simulations with INTERFACE and reactive INTERFACE force fields (IFF and IFF-R) were used to predict bulk and You

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Hawari, Ayman. Thermal Neutron Scattering Cross Sections for Graphitic Amorphous Carbon. Office of Scientific and Technical Information (OSTI), 2022. http://dx.doi.org/10.2172/1873987.

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