Relevant bibliographies by topics / Hexagonal Close Packing

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Hexagonal Close Packing'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Hexagonal Close Packing"

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BURSILL, L. A., and FAN XUDONG. "CLOSE-PACKING OF GROWING DISCS." Modern Physics Letters B 02, no. 11n12 (December 1988): 1245–52. http://dx.doi.org/10.1142/s0217984988001193.

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Spiral lattices are derived by allowing growing discs to aggregate under a close-packing rule. Both Fibonacci and Lucas numbers of visible spirals arise naturally, dependent only on the choice of growth centre. Both the rate of convergence towards an ideal spiral, and chirality, are determined by the initial placement of the first few discs (initial conditions). Thus the appearance of spiral packings is no more or less mysterious than the appearance of hexagonal packed arrays of equal discs.
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Almarza, N. G. "Hexagonal close-packing structure on a cubic cell." Journal of Chemical Physics 123, no. 5 (August 2005): 056101. http://dx.doi.org/10.1063/1.1997138.

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Emmerling, Franziska, and Caroline Röhr. "Alkalimetall-Arsenide A3As7 Und Aas (A = K, Rb, Cs). Synthesen, Kristallstrukturen, Schwingungsspektren / Alkaline Metal Arsenides A3As7 and AAs (A = K, Rb, Cs). Preparation, Crystal Structure, Vibrational Spectroscopy." Zeitschrift für Naturforschung B 57, no. 9 (September 1, 2002): 963–75. http://dx.doi.org/10.1515/znb-2002-0901.

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The title compounds were synthesized from the elements and characterized via single crystal x-ray studies and Raman spectroscopy. In the Zintl phases A3As7 (A = K, Rb, Cs) the As atoms form nortricyclene-analogous anions As37 with As-As distances ranging from 230 to 254 pm. The three compounds crystallizewithdifferent newstructure types containing different packings of theAs7 anions:K3As7 (orthorhombic, Pbca; a=1291.9(8), b = 2544.1(9), c=1537.7(16) pm) shows a double hexagonal close packing (ABAC stacking of planes of hexagonal close packed anions), Rb3 As7 (monoclinic, P21/c, a = 757.3(5), b = 1310.2(8), c = 2692.7(18) pm , β= 91.972(12)°) hows a hexagonal close packing (AB) and the Cs compound (orthorhombic, Pbca, a = 1022.8(5), b = 1317.6(7), c = 2195.2(11) pm) a cubic close packing (ABC) (also present in theHT-forms of the three compounds) respectively. The alkaline metalmonoarsenides AAs (A = K, Rb) crystallize with the NaP structure type (A = K/Rb: orthorhombic, P212121; a = 661.7(5) / 658.1(8), b = 688.8(6) / 691.6(8), c = 1197.3(10) / 1204.7(10) pm, Z = 8) with approximate fourfold screw axes 41 of As$ chains, whereas the crystal structure of CsAs (hexagonal, P¯62m, a = 1219.7(3), c = 1046.3(2) pm, Z = 18) contains three crystallographically independent three membered rings As33 with As-As distances of 243.0 to 247.5 pm
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Zeng, Xiangbing, Yongsong Liu, and Marianne Impéror-Clerc. "Hexagonal Close Packing of Nonionic Surfactant Micelles in Water." Journal of Physical Chemistry B 111, no. 19 (May 2007): 5174–79. http://dx.doi.org/10.1021/jp0687955.

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Wolff, Nicole, Stefan Gerth, Philipp Gutfreund, and Max Wolff. "Temperature dependent cubic and hexagonal close packing in micellar structures." Soft Matter 10, no. 42 (2014): 8420–26. http://dx.doi.org/10.1039/c4sm01569j.

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The delicate correlation of temperature, micellar properties and type of structure is investigated for a micellar crystal at a solid boundary. The cubic and hexagonal close packing is analyzed in detail by grazing incidence neutron scattering.
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Wahab, Mohammad Abdul, and Khurram Mujtaba Wahab. "Study That Led to the Discovery of Rhombohedral Close Packing and Hexagonal Close Packing as Two New and Independent Lattices." Advanced Science, Engineering and Medicine 11, no. 12 (December 1, 2019): 1179–86. http://dx.doi.org/10.1166/asem.2019.2465.

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An ab-initio calculation of angles has been made between various directions on close packed basal plane with the tilted axis obtained by placing identical atoms on voids. Results obtained from simple calculations provide a lot of important information related to Rhombohedral Close Packed and Hexagonal Close Packed structures, effectively leading to their discovery as independent and genuine space lattices from close packed category of materials. En-route, we also propose a separate equation to calculate the angles between two given directions in the above mentioned close packed crystal systems. Modes of polytype formation in close packing of identical atoms is also briefly discussed.
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de Lara-Castells, María Pilar, Andreas W. Hauser, Alexander O. Mitrushchenkov, and Ricardo Fernández-Perea. "Quantum confinement of molecular deuterium clusters in carbon nanotubes: ab initio evidence for hexagonal close packing." Physical Chemistry Chemical Physics 19, no. 42 (2017): 28621–29. http://dx.doi.org/10.1039/c7cp05869a.

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Nowak, Roberta B., Robert S. Fischer, Rebecca K. Zoltoski, Jerome R. Kuszak, and Velia M. Fowler. "Tropomodulin1 is required for membrane skeleton organization and hexagonal geometry of fiber cells in the mouse lens." Journal of Cell Biology 186, no. 6 (September 14, 2009): 915–28. http://dx.doi.org/10.1083/jcb.200905065.

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Hexagonal packing geometry is a hallmark of close-packed epithelial cells in metazoans. Here, we used fiber cells of the vertebrate eye lens as a model system to determine how the membrane skeleton controls hexagonal packing of post-mitotic cells. The membrane skeleton consists of spectrin tetramers linked to actin filaments (F-actin), which are capped by tropomodulin1 (Tmod1) and stabilized by tropomyosin (TM). In mouse lenses lacking Tmod1, initial fiber cell morphogenesis is normal, but fiber cell hexagonal shapes and packing geometry are not maintained as fiber cells mature. Absence of Tmod1 leads to decreased γTM levels, loss of F-actin from membranes, and disrupted distribution of β2-spectrin along fiber cell membranes. Regular interlocking membrane protrusions on fiber cells are replaced by irregularly spaced and misshapen protrusions. We conclude that Tmod1 and γTM regulation of F-actin stability on fiber cell membranes is critical for the long-range connectivity of the spectrin–actin network, which functions to maintain regular fiber cell hexagonal morphology and packing geometry.
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Lucadamo, G. "Geometric Origin of Hexagonal Close Packing at a Grain Boundary in Gold." Science 300, no. 5623 (May 23, 2003): 1272–75. http://dx.doi.org/10.1126/science.1083890.

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Beck, J., and F. Wolf. "Three New Polymorphic Forms of Molybdenum Pentachloride." Acta Crystallographica Section B Structural Science 53, no. 6 (December 1, 1997): 895–903. http://dx.doi.org/10.1107/s0108768197008331.

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Three new polymorphic modifications of molybdenum pentachloride could be obtained by solvothermal syntheses in CCl4 and SbCl5 as solvents. The structures have been solved by single-crystal X-ray diffraction. The already known structure of monoclinic \alpha-MoCl5 (C2/m) is not isomorphous with \alpha-NbCl5 and is better derived from the closest packing of Cl atoms of the Sm type with molybdenum occupying 1/5 of the octahedral holes. The triclinic structure of \beta-MoCl5 (P\overline 1) can be derived from hexagonal closest packing. The orthorhombic structure of \gamma-MoCl5 (Pnma) and the monoclinic structure of \delta-MoCl5 (P21/c) can both be derived from double-hexagonal closest packing. All four forms of MoCl5 have in common the discrete Mo2Cl10 moieties built from edge-sharing double octahedra with the metal atoms displaced from the octahedron centres away from each other. The differences between the modifications lie in the different stacking sequences of the close-packed Cl-atom layers and the different occupation of the octahedral interstices. This is reflected in the group–subgroup relationships of the space groups of the closest packings and the molybdenum pentachlorides. X-ray powder diffraction shows that sublimed MoCl5 is a mixture of all four modifications in variable amounts and probably a further unknown form.
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Dissertations / Theses on the topic "Hexagonal Close Packing"

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Cronvall, Per. "Vektorkvantisering för kodning och brusreducering." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2377.

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This thesis explores the possibilities of avoiding the issues generally associated with compression of noisy imagery, through the usage of vector quantization. By utilizing the learning aspects of vector quantization, image processing operations such as noise reduction could be implemented in a straightforward way. Several techniques are presented and evaluated. A direct comparison shows that for noisy imagery, vector quantization, in spite of it's simplicity, has clear advantages over MPEG-4 encoding.

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Book chapters on the topic "Hexagonal Close Packing"

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Glazer, A. M. "3. Crystal structures." In Crystallography: A Very Short Introduction, 39–63. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198717591.003.0003.

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‘Crystal structures’ describes the different types of close packing—hexagonal, cubic, face-centred cubic, and body-centred cubic—used to describe many simple inorganic structures, especially those of the elements. The reason for atoms to pack so closely together is to form the densest array possible to provide a stable structure. The ability of a chemical substance to adopt different crystal structures is called polymorphism, as displayed by carbon. Examples of simple inorganic structures, such as common salt, are explained along with organic crystal structures, and the different methods of crystal growth. Crystallography has also played a major part in determining the structures and activities of large biological molecules like DNA, RNA, proteins, and viruses.
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Conference papers on the topic "Hexagonal Close Packing"

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Yuksel, Anil, Michael Cullinan, and Jayathi Murthy. "Thermal Energy Transport Below the Diffraction Limit in Close-Packed Metal Nanoparticles." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-4968.

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Fabrication of micro and nanoscale electronic components has become increasingly demanding due to device and interconnect scaling combined with advanced packaging and assembly for electronic, aerospace and medical applications. Recent advances in additive manufacturing have made it possible to fabricate microscale, 3D interconnect structures but heat transfer during the fabrication process is one of the most important phenomena influencing the reliable manufacturing of these interconnect structures. In this study, optical absorption and scattering by three-dimensional (3D) nanoparticle packings are investigated to gain insight into micro/nano heat transport within the nanoparticles. Because drying of colloidal solutions creates different configurations of nanoparticles, the plasmonic coupling in three different copper nanoparticle packing configurations were investigated: simple cubic (SC), face-centered cubic (FCC) and hexagonal close packing (HCP). Single-scatter albedo (ω) was analyzed as a function of nanoparticle size, packing density, and configuration to assess effect for thermo-optical properties and plasmonic coupling of the Cu nanoparticles within the nanoparticle packings. This analysis provides insight into plasmonically enhanced absorption in copper nanoparticle particles and its consequences for laser heating of nanoparticle assemblies.
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Reports on the topic "Hexagonal Close Packing"

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John D. Bess, Barbara H. Dolphin, James W. Sterbentz, Luka Snoj, Igor Lengar, and Oliver Köberl. HTR-PROTEUS Pebble Bed Experimental Program Cores 1, 1A, 2, and 3: Hexagonal Close Packing with a 1:2 Moderator-to-Fuel Pebble Ratio. Office of Scientific and Technical Information (OSTI), March 2013. http://dx.doi.org/10.2172/1064064.

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John D. Bess, Barbara H. Dolphin, James W. Sterbentz, Luka Snoj, Igor Lengar, and Oliver Köberl. HTR-PROTEUS Pebble Bed Experimental Program Cores 1, 1A, 2, and 3: Hexagonal Close Packing with a 1:2 Moderator-to-Fuel Pebble Ratio. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1042385.

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Journal articles
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