Relevant bibliographies by topics / Shells

Contents

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

Academic literature on the topic 'Shells'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 July 2024

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Journal articles on the topic "Shells"

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Wen, Mingzheng, Huaibo Zhang, Shoujun Wang, Zhiwen Shang, Shaotong Zhang, Peng Yang, and Hong Wang. "Field Investigation on the Coastal Erosion and Progradation Evolution of the Binzhou Shelly Chenier in China: Comparisons between Normal and Typhoon Hydrodynamics." Journal of Marine Science and Engineering 10, no. 6 (May 30, 2022): 752. http://dx.doi.org/10.3390/jmse10060752.

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The shelly chenier is a dike-like accumulation formed by waves, currents, and other hydrodynamic forces pushing the shells and their debris in the intertidal zone to the high tide line. It is a special type of coastal dike. The shelly chenier located in Wangzi Island of northern Shandong Province is the last well-preserved chenier of the Bohai Bay with natural attributes exposed on the surface. It has unique and irreplaceable attributes among the shell beaches of China. Based on remote sensing interpretation, field investigation, and GPS-RTK (Real-Time Kinematic) measurement, this paper investigates the coastal erosion and progradation evolution of the Binzhou Shelly Chenier in China usingcomparisons between normal and typhoon hydrodynamics. The results show that: (1) There are two kinds of shelly chenier in the study area, the first is “the tidal channel shelly chenier” which is significantly affected by the tidal current, and the second is “the open shelly chenier”, which is significantly affected by direct scouring and silting of waves. The open shelly chenier is continuously eroding under the normal hydrodynamics and the shell beach is supplied by a large number of shells and their debris under the typhoon hydrodynamics, while the tidal channel shelly chenier is gradually developed due to the action of alongshore currents and in–out flows. (2) The energy of waves and currents under normal hydrodynamics is insufficient to transport the shells and their debris in the intertidal zone to the shell-beach. On the contrary, the continuous action of waves makes the shells and their debris on the open-shell beach finer and transports the shells and their debris to the sea causing erosion and retreat of the shelly chenier. (3) The action of typhoons and other strong winds and waves results in the original accumulation on the open shell-beach being further transported to the land and provides a large amount of shells and debris from the intertidal zone to the shelly chenier. Based on GPS-RTK monitoring data from 2020–2021, it was found that the transport volume of shells and debris caused by a typhoon storm surge is equivalent to the annual transport volume under normal ocean dynamics.
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Flessa, Karl W., Alan H. Cutler, and Keith H. Meldahl. "Time and taphonomy: quantitative estimates of time-averaging and stratigraphic disorder in a shallow marine habitat." Paleobiology 19, no. 2 (1993): 266–86. http://dx.doi.org/10.1017/s0094837300015918.

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We examined the radiocarbon age, taphonomic condition and stratigraphic position of shells of the venerid bivalveChionespp. from the tidal flats of Bahia la Choya, Sonora, Mexico. Shells in Bahia la Choya are time-averaged. Thirty shells yielded radiocarbon dates from modern (A.D. 1950 or younger) to 3569 years before present. The median calendar age of inner flat shells is 483 years; the median age of tidal channel shells is 427 years. We interpret such long shell survival to be the result of frequent shallow burial. Such burial retards bioerosion of shells.The taphonomic condition of shells varied with environment. Shells from the surface of the inner flats were better preserved than shells from the tidal channel. Shells are more likely to be physically worn and biologically degraded in the waters of the channel than on the quieter and more frequently exposed inner tidal flat. Taphonomic condition is an unreliable indicator of a shell's time-since-death. Poorly-preserved shells on the inner flats tended to be old, but in general shell condition was much more variable than shell age. A shell's condition is more likely the result of its total residence time on the surface than its time-since-death (surface time plus burial time).Two composite short (44 cm and 50 cm) cores revealed varying degrees of stratigraphic disorder (the departure from perfect correlation between relative stratigraphic position and relative age). One of eight shells in the inner flats core was disordered; four of nine shells in the tidal channel were disordered. The actual age range of surface shells approximates the age range of shells in cores. Stratigraphic disorder is a consequence of both time-averaging and physical and biogenic mixing.Time-averaging controls the degree of precision possible in paleoecological studies. Environmental changes and ecological phenomena occurring within a span of 3500 years would not be recognized in deposits like those of Bahia la Choya. Time-averaging and stratigraphic disorder also constrain the temporal resolution possible in microstratigraphic studies of evolution. The extent of time-averaging and stratigraphic disorder will dictate an appropriate sample interval. In order to prevent temporal overlap between successive samples in deposits like Bahia la Choya, sample spacing should not be less than approximately 0.5 m.
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Ayres-Peres, Luciane, Aline Ferreira Quadros, and Fernando L. Mantelatto. "Comparative analysis of shell occupation by two southern populations of the hermit crab Loxopagurus loxochelis (Decapoda, Diogenidae)." Brazilian Journal of Oceanography 60, no. 3 (September 2012): 299–310. http://dx.doi.org/10.1590/s1679-87592012000300003.

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The present study aimed to comparatively verify the relation between the hermit crabs and the shells they use in two populations of Loxopagurus loxochelis. Samples were collected monthly from July 2002 to June 2003, at Caraguatatuba and Ubatuba Bay, São Paulo, Brazil. The animals sampled had their sex identified, were weighed and measured; their shells were identified, measured and weighed, and their internal volume determined. To relate the hermit crab's characteristics and the shells' variables, principal component analysis (PCA) and a regression tree were used. According to the PCA analysis, the three gastropod shells most frequently used by L. loxochelis varied in size. The regression tree successfully explained the relationship between the hermit crab's characteristics and the internal volume of the inhabited shell. It can be inferred that the relationship between the morphometry of an individual hermit crab and its shell is not straightforward and it is impossible to explain only on the basis of direct correlations between the body's and the shell's attributes. Several factors (such as the morphometry and the availability of the shell, environmental conditions and inter- and intraspecific competition) interact and seem to be taken into consideration by the hermit crabs when they choose a shell, resulting in the diversified pattern of shell occupancy shown here and elsewhere.
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Theis, Christian. "Formation of Twin Clusters in a Galactic Tidal Field." Symposium - International Astronomical Union 207 (2002): 681–83. http://dx.doi.org/10.1017/s0074180900224534.

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The formation of globular clusters is still an unsolved problem. Though most scenarios assume a massive molecular cloud as the progenitor, it is unclear how the cloud is transformed into a star cluster. Here a scheme of supernova (SN) induced cluster formation is investigated. In this scenario the expanding SN shell accumulates the mass of the cloud. This is accompanied by fragmentation resulting in star formation in the shell. If this stellar shell expands sufficiently slowly, its self-gravity leads to a recollapsing shell, thus forming one or several stellar clusters.In this paper N-body simulations of collapsing shells moving on circular orbits in a galactic potential are presented. It is shown that typical shells (105 M⊙, 30 pc) evolve to twin clusters in the galactocentric distance range between 3 and 11 kpc. Their masses show a strong radial trend: on orbits inside 5 kpc both clusters have almost equal mass. Outside 5 kpc the more massive twin cluster contains about 55% of the shell's mass, whereas the mass of the smaller decreases linearily to 15% at 11 kpc. Outside 11 kpc the collapsing shells end up in a single cluster. Inside 3 kpc the shells are tidally disrupted and only fragments substantially less massive than the initial shell survive.
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Zhang, Shi, Yun Zhang, Zhigao Huang, Huamin Zhou, and Jianhui Li. "The inter-element coupling effect of triangular flat shells." Engineering Computations 32, no. 7 (October 5, 2015): 1959–80. http://dx.doi.org/10.1108/ec-11-2014-0230.

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Purpose – The purpose of this paper is to study the inter-element coupling effect of membrane and plate components between two adjacent shells occurring on the common boundary. Design/methodology/approach – In this paper, three triangular flat shells developed by combining an excellent membrane element (OPT) with three outstanding plate bending elements (DKT, RDKTM and DST-BK), respectively, are used to study this phenomenon. Benchmark tests are implemented to evaluate the performance of three selected plate elements and the formulated flat shells. Findings – The inter-element coupling effect of membrane and plate components belonging, respectively, to two adjacent shells deteriorate the performance of shells. Therefore, a shell’s performance cannot be guaranteed certainly by the superimposed membrane and plate behaviors. Practical implications – The “order matching” criterion is proposed to explain this phenomenon and it is concluded that the flat shell that follows this criterion explicitly may alleviate or even overcome the inter-element coupling effect. Originality/value – Previous studies mainly focus on formulation of high-performance membrane and plate elements. However, the inter-element coupling effect of membrane and plate components between two adjacent shells occurring on the common boundary, has attracted less attention. Thorough benchmark tests for three flat shells are implemented to investigate the phenomenon. The results shows that the inter-element coupling effect deteriorates the performance of shells. And the “order matching” criterion is proposed to explain this phenomenon and it is concluded that the flat shell that follows this criterion explicitly may alleviate or even overcome the inter-element coupling effect.
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Srichanachaichok, Wiranchana, and Dakrong Pissuwan. "Micro/Nano Structural Investigation and Characterization of Mussel Shell Waste in Thailand as a Feasible Bioresource of CaO." Materials 16, no. 2 (January 13, 2023): 805. http://dx.doi.org/10.3390/ma16020805.

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Mussel shell waste, which is regularly disposed by households, restaurants, markets, or farms, causes environmental problems worldwide, including in Thailand, because of its long decomposing time. Owing to a large amount of calcium (Ca) content from calcium carbonate (CaCO3) in mussel shell waste, many Thai local businesses grind the shell waste into powder and sell it as a source of Ca. Generally, these powdered waste shells are a mixture of various types of mussel shell waste. In this study, we investigated and characterized powdered mixed waste shells sold in a local Thai market (called mixed shell powder) and ground shells from waste green mussel shells (called green mussel shells) prepared in the laboratory after calcination at different temperatures (800 °C, 900 °C, and 1000 °C). Mixed shell powder containing five different types of mussel shells and green mussel shells were calcined for 2 h and 3 h, respectively. The time used for calcination of mixed shell powder and green mussel shells was different due to the different particle sizes of both shell wastes. We found that an optimal temperature of 1000 °C completely converted CaCO3 to CaO in both samples. The nanoscale size of CaO was detected at the surface of calcined shells. These shell wastes can be used as a bioresource of CaO.
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Yang, Yeong-Bin, and Jae-Hoon Kang. "Comparisons of Paraboloidal Shells and Sinusoidal-Shaped Shells in Natural Frequencies." Volume 24, No 3, September 2019 24, no. 3 (September 2019): 451–57. http://dx.doi.org/10.20855/ijav.2019.24.312.

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Natural frequencies and mode shapes are obtained for a sinusoidal-shaped shell of revolution by using the Ritz method from a three-dimensional (3-D) analysis instead of a mathematically two-dimensional (2-D) thin shell theory or high order thick shell theory. The present analysis uses circular cylindrical coordinates instead of 3-D shell coordinates, which have been used in traditional shell analyses. Convergence studies can analyze the first five frequencies to four-digit exactitude. Results are given for a variety of shallow and deep sinusoidal-shaped shells with different boundary conditions. The sinusoidal-shaped shells are very similar to paraboloidal shells in shape. The frequencies of the sinusoidal-shaped shells from the present 3-D method are compared with those from 2-D thin shell theories for paraboloidal shells. The present 3-D method is applicable to very thick as well as thin shells.
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Yang, Yeong-Bin, and Jae-Hoon Kang. "Comparisons of Paraboloidal Shells and Sinusoidal-Shaped Shells in Natural Frequencies." June 2019 24, no. 2 (September 2019): 451–57. http://dx.doi.org/10.20855/ijav.2019.24.31276.

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Natural frequencies and mode shapes are obtained for a sinusoidal-shaped shell of revolution by using the Ritz method from a three-dimensional (3-D) analysis instead of a mathematically two-dimensional (2-D) thin shell theory or high order thick shell theory. The present analysis uses circular cylindrical coordinates instead of 3-D shell coordinates, which have been used in traditional shell analyses. Convergence studies can analyze the first five frequencies to four-digit exactitude. Results are given for a variety of shallow and deep sinusoidal-shaped shells with different boundary conditions. The sinusoidal-shaped shells are very similar to paraboloidal shells in shape. The frequencies of the sinusoidal-shaped shells from the present 3-D method are compared with those from 2-D thin shell theories for paraboloidal shells. The present 3-D method is applicable to very thick as well as thin shells.
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Nurudin, La Ode, Lukas Kano Mangalla, and La Ode Ahmad Barata. "Analisis Karakteristik Biomassa Cangkang Kelapa Dan Kulit Mete Melalui Proses Torefaksi." Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin 7, no. 1 (April 3, 2022): 28. http://dx.doi.org/10.55679/enthalpy.v7i1.24559.

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In the face of the depletion of fossil fuels, alternative fuels such as biomass are needed. However, biomass has a fairly low calorific value and several other disadvantages compared to petroleum. Therefore, a new breakthrough is needed to correct these weaknesses, one of which is the Torrefaction process. The purpose of this study was to determine the effect of torrefaction of coconut shell and cashew shell biomass on the physical and chemical properties of the material. This research was conducted using coconut shells and cashew shells. The results of this study indicate that the calorific value of coconut shells and cashew shells after torrefaction is 5115,297-5147,021 cal/gr. The water content in coconut shells is 2.718% and the value of water content in cashew shells is 2.397%, the ash content of coconut shells is 6.853% and the value of cashew shell ash content is 6.600%, the value of volatile levels of coconut shells is 14.885% and the value of volatile levels of cashew shells of 14.557% and the value of fixed carbon content of coconut shell is 75.574% and the value of fixed carbon content of cashew shell is 76.447%. Keywords : Biomass, coconut shell, cashewnut shell, torrefaction
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Wang, Zhen, and Yang Zhao. "Buckling Strength of Tapered Cylindrical Shells under Partial Axial Compression: Effect of Circumferential Weld-Induced Imperfections." Advanced Materials Research 163-167 (December 2010): 49–54. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.49.

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Buckling is often the main design consideration for thin cylindrical shells. For most load cases, the stability behavior of the shell is acutely sensitive to circumferential weld-induced imperfections, and the corresponding residual stresses are some beneficial to buckling strength of the shell generally. However, these conclusions are all based on the cylinders with constant wall thickness, and the studies about the effect of residual stresses on buckling strength of tapered cylindrical shells under partial axial compression are few. This paper applies trapezoidal strain field approach to simulate circumferential weld-induced imperfections on tapered cylindrical shellls, and studies the stability behavior of the cylinders with single circumferential weld and multiple circumferential welds under partial axial compression respectively. By comparing the results derived from the models with/without circumferential welds and corresponding residual stresses, the effects of weld depressions and residual stresses on tapered cylindrical shells under partial axial compression are obtained.
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Dissertations / Theses on the topic "Shells"

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Scott, Joline L. "Shells." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1285194565.

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Caresta, Mauro Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Structural and acoustic responses of a submerged vessel." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/44404.

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Excitation of the low frequency vibrational modes of a submerged vessel can generate significant radiated noise levels. Vibrational modes of a submarine hull are excited from the transmission of fluctuating forces through the shaft and thrust bearings due to the propeller rotating in an unsteady fluid. The focus of this work is to investigate the structural and acoustic responses of a submarine hull under axial excitation. The submarine hull is modelled as a cylindrical shell with internal bulkheads and ring stiffeners. The cylindrical shell is closed by truncated conical shells, which in turn are closed at each end using circular plates. The entire structure is submerged in a heavy fluid medium. The structural responses of the submerged vessel are calculated by solving the cylindrical shell equations of motion using a wave approach and the conical shell equations with a power series solution. The displacement normal to the surface of the structure in contact with the fluid medium was calculated by assembling the boundary/continuity matrix. The far field radiated sound pressure was then calculated by means of the Helmholtz integral. Results from the analytical model are compared with computational results from a fully coupled finite element/boundary element model. The individual and combined effects of the various influencing factors, corresponding to the ring stiffeners, bulkheads, conical end closures and fluid loading, on the structural and acoustic responses are characterised by examining the contribution by the circumferential modes. It is shown that equally spaced internal bulkheads generate a periodic structure thus creating a grouping effect for the higher circumferential modes, but do not have strong influence on the sound radiation. Stiffeners are found to have an important effect on both the dynamic and acoustic responses of the hull. The contribution of the conical end closures on the radiated sound pressure for the lowest circumferential mode numbers is also clearly observed. This work shows the importance of the bending modes when evaluating the sound pressure radiated by a submarine under harmonic excitation from the propulsion system.
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Loukaides, Evripides George. "Elementary morphing shells." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/269724.

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Multistable shells are not yet completely understood. Even under the widespread Uniform Curvature (UC) assumption, the limits of this behaviour have not been established and the influence of individual material and geometric parameters has not been described conclusively; this research explores these open questions. In addition, this project was motivated by the need for practical design guidelines and the pursuit of alternative construction and actuation methods for multistable shells. Our analysis is based on an expression for the strain energy of a shell under a set of simplifying assumptions— primarily the aforementioned UC assumption. We extend this concept beyond the work of previous authors by admitting a more diverse range of anisotropic materials. Furthermore, we take advantage of some aspects of the mathematical field of Catastrophe Theory (CT) to maximise the generality of available results. When appropriate, we examine aspects of our predictions by constructing relevant shell structures, with particular focus on material considerations. A commercial Finite Element Analysis package provides additional means of analysis and comparison. On the theoretical front, the influence of certain control parameters on the availability of multistability is described in closed-form while a unique graphical overview of the limits of this behaviour is provided. In the lab, a novel tristable shell is constructed from a laminate and the use of specialized materials is scrutinised. In a subsequent project, a bistable spherical cap made from a customized material is actuated by a magnetic field—the ensuing snap-through event is recorded with a high-speed camera, leading to valuable insights on the transition geometry. Furthermore, we confirm the possibility of bistability for developable, non-prestressed shells, composed of a single material, using grid shells and thin honeycomb shells.
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McDaniel, James Gregory. "A new higher-order shell theory for vibration and viscoelastically-coated circular cylindrical shells." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15825.

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Li, Jian-Min [Verfasser], and Jan [Akademischer Betreuer] Knippers. "Timber shell structures : form-finding and structural analysis of actively bent grid shells and segmental plate shells / Jian-Min Li ; Betreuer: Jan Knippers." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1138234893/34.

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Sadr-Hashemi, Farshid. "Buckling of conical shells." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685403.

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Htet, Aung Thu. "Full-body Shell Creation for CAD Virtual Humans including Tightly-Spaced, Enclosed Shells." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-theses/1264.

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Computational human models have become essential in several different biomedical and electrical engineering research areas. They enable scientists to study, model, and solve complex problems of human body responses to various external stimuli including electromagnetic and radio-frequency signals. This study describes the algorithms and procedures of creating multi-tissue full-body Computer-Aided Design (CAD) human models. An emphasis is made on full-body shells of variable thicknesses, e.g. skin, fat, and average body container shells. Such shells, along with internal organs, are useful for multiple high- and low-frequency simulations in a variety of applications. Along with the creation of full-body models, an automatic algorithm to selectively decimate the meshes based on average surface curvature is developed. The algorithm will significantly reduce model size while keeping the same interpolation accuracy.
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Kolahi, Abdolahad Salehi. "Co-rotational methods for small and large strain beams, sheets and shells." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299133.

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Shin, Haksik. "Nonlinear analysis of axisymmetric shells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0017/MQ58505.pdf.

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Oudmaijer, René Dick. "Evolved stars with circumstellar shells." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1995. http://irs.ub.rug.nl/ppn/141387866.

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Books on the topic "Shells"

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Wallace, Nancy Elizabeth. Shells! shells! shells! New York: Marshall Cavendish, 2006.

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Chatterjee, Binoy Kumar. Theory and design of concrete shells. London: Chapman and Hall, 1988.

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Hopkins, Therese. Shells. New York: Rosen Pub. Group's PowerKids Press, 2009.

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Richards, Deirdre. Shells. Cape Town: Struik, 1988.

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Claassen, Cheryl. Shells. Cambridge, U.K: Cambridge University Press, 1998.

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Bouchet, Philippe. Shells. New York: Abbeville Press, 2008.

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Bouchet, Philippe. Shells. New York: Abbeville Press, 2008.

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John, Mousdale, ed. Shells. London: Macdonald, 1986.

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Mayer, Cassie. Shells. Oxford: Heinemann Library, 2006.

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Inc, Dorling Kindersley, ed. Shells. New York: Dorling Kindersley, 1991.

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Book chapters on the topic "Shells"

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Hartmann, Friedel, and Casimir Katz. "Shells." In Structural Analysis with Finite Elements, 391–408. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05423-9_6.

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Knoebel, Arthur. "Shells." In Sheaves of Algebras over Boolean Spaces, 179–219. Boston, MA: Birkhäuser Boston, 2011. http://dx.doi.org/10.1007/978-0-8176-4642-4_7.

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Häussler-Combe, Ulrich. "Shells." In Computational Methods for Reinforced Concrete Structures, 255–80. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783433603611.ch8.

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Petersen, Richard. "Shells." In Beginning Fedora Desktop, 391–434. Berkeley, CA: Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3882-0_10.

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Petersen, Richard. "Shells." In Beginning Fedora Desktop, 311–40. Berkeley, CA: Apress, 2014. http://dx.doi.org/10.1007/978-1-4842-0067-4_11.

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Petersen, Richard. "Shells." In Beginning Fedora Desktop, 305–34. Berkeley, CA: Apress, 2013. http://dx.doi.org/10.1007/978-1-4302-6563-4_12.

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Hartmann, Friedel. "Shells." In The Mathematical Foundation of Structural Mechanics, 272–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82401-2_9.

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Poceski, Apostol. "Shells." In Mixed Finite Element Method, 247–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84676-2_6.

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Gajewski, Antoni, and Michal Zyczkowski. "Shells." In Optimal Structural Design under Stability Constraints, 225–52. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2754-4_8.

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Hertz, Kristian Dahl, and Philip Halding. "Shells." In Sustainable Light Concrete Structures, 137–59. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80500-5_8.

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Conference papers on the topic "Shells"

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Tzou, H. S. "Distributed Piezoelectric Neurons and Muscles for Shell Continua." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0178.

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Abstract Conventional shell continua are passive, which do not possess any sensation and action/reaction capabilities. In this paper, distributed piezoelectric layers coupled with conventional elastic shell distributed systems are used as distributed “neurons” (sensors) and “muscles” (actuators) for structural monitoring and actuation of shells. New theories on distributed “neural” sensation and actuation of shells are developed based on a generic shell continuum coupled with piezoelectric neurons and muscles. Open and closed loop system dynamic equations are also derived. The system equations are further transferred to state equations. The derived theories can be directly simplified to a broad class of geometries, cylindrical shells, spherical shells, conical shels, zero-curvature shells (i.e., plates: rectangular, circular, etc.), beams, etc. Applications of the theories to a cylindrical shell using four system parameters, two Lame’s parameters and two radii of curvature, are demonstrated.
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Amabili, M., and Ye Kurylov. "Nonlinear Vibrations of Cantilever Circular Cylindrical Shells." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28484.

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Only experimental studies are available on large amplitude vibrations of cantilever shells. In the present paper, large-amplitude nonlinear vibrations of cantilever circular cylindrical shell are investigated. Shells with perfect and imperfect shape are studied. The Sanders-Koiter nonlinear shell theory, which includes shear deformation, is used to calculate the elastic strain energy. Shell’s displacement fields (longitudinal, circumferential and radial) are expanded by means of a double mixed series: harmonic functions for the circumferential variable; Chebyshev polynomials for the longitudinal variable. Boundary conditions are exactly satisfied. The Lagrangian approach is applied to obtain a system of nonlinear ordinary differential equations. The nonlinear equations of motion are studied by using arclength continuation method and bifurcation analysis. Numerical responses in the spectral neighborhood of the lowest natural frequency are obtained.
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Toorani, M. H., and A. A. Lakis. "Flow-Induced Vibration of Anisotropic Cylindrical Shells." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39029.

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This paper deals with the vibration analysis of anisotropic laminated cylindrical shells conveying fluid. We focus on the axi-symmetric (n=0) and lateral (beam-like, n=1) vibration modes of the anisotropic cylindrical shells. Particularly important in this study is to obtain the natural frequencies of the fluid-structure coupled system and also to estimate the critical flow velocity at which the structure loses its stability. The coupled equations between the shell and the fluid are derived from a refined shell theory by taking into account the shear deformation effects. The displacement functions are obtained from the exact solution of refined shell equations and therefore the mass and stiffness matrices of the shell are determined by precise analytical integration. The added mass, stiffness and damping matrices of the fluid are obtained by an analytical integration of the fluid pressure over the liquid element. Thereafter, these matrices are coupled with the dynamic equation of the empty shell. The natural frequencies obtained with the shell partially or completely filled with liquid are in good agreement with those obtained experimentally and from other theories. The stability of the shell subjected to a flowing fluid is also studied. The shell’s anisotropy is discussed.
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"Saddle Shells." In SP-110: Hyperbolic Paraboloid Shells. American Concrete Institute, 1988. http://dx.doi.org/10.14359/2816.

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Gunes, Recep, M. Kemal Apalak, and H. Abdullah Tasdemir. "Post-Buckling of Functionally Graded Cylindrical Shells." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41301.

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In this study, the post-buckling analysis of functionally graded cylindrical shells was carried out using the non-linear finite element method. The longitudinal shell edges were hinged under a central transverse concentrated load. The shells were composed of ceramic (Al2O3) and metal (Ni) phases and the mechanical properties at the region between the metal and ceramic layers vary continuously through the shell thickness according to a power-law distribution of the volume fractions of the constituents. The arc-length method was implemented. The effects of material composition and layer number as well as various shell thicknesses on the post-buckling response of the functionally graded cylindrical shells were investigated. The functionally graded shells exhibit both snap-through and snap-back post buckling behaviours. The layer number through the shell thickness has a minor effect on the post-buckling behaviour whereas the compositional gradient exponent varies from 0.1 to 10.0 the snap-through behaviour becomes more obvious whilst both the snap-through and snap-back behaviours appear for a thinner shell.
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Soares, Renata M., and Paulo B. Gonçalves. "Buckling and Nonlinear Analysis of Conoidal Shells." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59552.

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Slender shell structures described by ruled surfaces have been frequently used in civil engineering and, among these slender shells, conoidal shells are frequently favored as roofing units to cover large column-free areas due to their ease of construction, aesthetic value and structural efficiency. This work studies the nonlinear post-buckling behavior of a conoidal shell, using commercial finite element software ABAQUS®. The problem is geometrically nonlinear due to the shell strong geometric nonlinearity, especially in the case of shallow shells used in practical applications where quadratic nonlinearities play an important role. A detailed parametric analysis is conducted to show the influence of the shell geometry on the buckling loads and natural frequencies and, especially, on the nonlinear post-buckling behavior and stability.
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Amabili, M., and Ye Kurylov. "Nonlinear Vibrations of Circular Cylindrical Shells With Different Boundary Conditions." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10891.

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Large-amplitude nonlinear vibrations of circular cylindrical shells with different boundary conditions are investigated. The Sanders-Koiter nonlinear shell theory, which includes shear deformation, is used to calculate the elastic strain energy. Shell’s displacement fields (longitudinal, circumferential and radial) are expanded by means of a double mixed series: harmonic functions for the circumferential variable; Chebyshev polynomials for the longitudinal variable. Boundary conditions for both simply supported and clamped-clamped shells are exactly satisfied. The Lagrangian approach is applied to obtain a system of nonlinear ordinary differential equations. Different expansions involving from 14 to 34 generalized co-ordinates, associated with natural modes of both simply supported and clamped-clamped shells are used to study the convergence of the solution. The nonlinear equations of motion are studied by using arclength continuation method and bifurcation analysis. Numerical responses obtained in the spectral neighborhood of the lowest natural frequency are compared with the results available in literature.
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Chadwick, Jeffrey N., Steven S. An, and Doug L. James. "Harmonic shells." In ACM SIGGRAPH Asia 2009 papers. New York, New York, USA: ACM Press, 2009. http://dx.doi.org/10.1145/1661412.1618465.

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Takeshita, Wakana. "Method shells." In the 12th annual international conference companion. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2457392.2457410.

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Nakagaki, Ken. "Mechanical Shells." In UIST '20: The 33rd Annual ACM Symposium on User Interface Software and Technology. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3379350.3415801.

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Reports on the topic "Shells"

1

Malone, Nathan, Eric Bowes, and Jennifer Hollingsworth. Double Shells! Pbs/CdS/Cu2-xS Core/Shell/Shell Quantum dots. Office of Scientific and Technical Information (OSTI), September 2023. http://dx.doi.org/10.2172/2005792.

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Cook, R. Density Measurements of Be Shells. Office of Scientific and Technical Information (OSTI), February 2005. http://dx.doi.org/10.2172/15014731.

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Gunther, J., and R. Cook. Chemical Analysis Of Beryllium Shells. Office of Scientific and Technical Information (OSTI), November 2005. http://dx.doi.org/10.2172/881070.

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Marshall, S. L., L. Redey, G. F. Vandegrift, and D. R. Vissers. Electroformation of uranium hemispherical shells. Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/5274651.

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Cook, R. HOLE DRILLING BREAKTHROUGH IN BE SHELLS. Office of Scientific and Technical Information (OSTI), September 2004. http://dx.doi.org/10.2172/15011625.

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Fearon, E. Characterization of Russian ballistic furnace shells. Office of Scientific and Technical Information (OSTI), February 1999. http://dx.doi.org/10.2172/8497.

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Ice, G. E., J. S. Chung, and M. Nagedolfeizi. X-ray fluorescence microtomography of SiC shells. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/603700.

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Hidalgo-Hernandez, Ruth G., Paul G. Allison, Brett A. Williams, Luis A. de Bejar, W. S. Hart, and Jason Morson. Structure-Property Relationships of Steel Cylindrical Shells. Fort Belvoir, VA: Defense Technical Information Center, March 2012. http://dx.doi.org/10.21236/ada559001.

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Trettel, Daniel, Cheryl Kerfeld, and Cesar Gonzalez Esquer. Dynamic Structural Determinants in Bacterial Microcompartment Shells. Office of Scientific and Technical Information (OSTI), February 2024. http://dx.doi.org/10.2172/2377758.

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Cook, B., M. McElfresh, C. Alford, E. Fought, and S. Letts. Attempts to Produce D2-Gas-Filled Be Shells. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/15014506.

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