Relevant bibliographies by topics / Shell structure

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Shell structure'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 June 2025

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Journal articles on the topic "Shell structure"

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Pathan, Abdullah Faruque, and Kavita Golghate. "R.C.C Shell Structure Design of Selected Head Cap Shape." International Journal for Research in Applied Science and Engineering Technology 11, no. 8 (2023): 906–17. http://dx.doi.org/10.22214/ijraset.2023.55273.

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Abstract: A shell structure is a thin structure composed of curved sheets of material, so that Shell structures are inspired from natural element named “SHELL”. A thin curved member or slab usually of reinforced concrete that function as tension member and shell. The waviness plays an important role in the structural behavior realizing a spatial form. Some of natural elements like eggshell, seashell, fruit shells (walnut) etc are showing shell structure properties. The present reinforced concrete shells as a very efficient structure, spanning wide, architectonically beautiful, relevant and valuable structural solution. Shell structures are very attractive lightweight structures, which are especially suited to Architectural building, industrial application, commercial projects etc.. The actual design of shells, involves theories of shells and the use of appropriate codes of practice. Types of curved shell like Parabolic, Hyperbolic or Cylindrical members are often said to act as tension rigidity hence called tensile members. For achieving the optimized load capability and flexural strength of such an element in form of shell covering structure is checked in for M30 grade concrete. Tensile shell members are structural edifice that caries only tension and without buckling or bending. Tensile structures are the most common type of thin-shell structures used worldwide from past decades. The profile and aspect of structure used are unlike for loading conditions, geographical locations and Architecture design differs as such as horizontal, sloping or curved member (dome and shell member). In this research work the tensile shell (plate) structure is designed in the form of beam and as grid shell slab element (plate). After then load has been applied for analysis via software tool i.e. STAAD Pro. The types of load assigned dead and live loads. The Design code specifications for curved shell member in IS: 2210–1994, IS 2204-1962 “Code of practice for construction of reinforced concrete shell roof” [CED 13: Building Construction Practices including Painting, Varnishing and Allied Finishing] and the load case criteria is to be as per IS: 875(2)–2000. RCC design specifications as per IS: 456–2000
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Dayou, Chen. "Statistical model of nuclide shell structure." Physics & Astronomy International Journal 2, no. 1 (2018): 64–72. http://dx.doi.org/10.15406/paij.2018.02.00050.

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This thesis, after a systematic and in-depth analysis of known nuclides, pro-poses a new model of nuclides’ shell structure and offers a table of the shell structures of 935 nuclides. With this theoretic approach, the thesis studies the shell combination with a bias towards the statistical analysis of nuclide structures. This thesis distinguishes between the basic models of nuclides and gives 7criteria for nu-clide binding, the maximal nucleonic number of each shell (ΔAi ), combination of proton and neutron (p/n) and graphs of the nuclide growth. Based on magnetic moment, it also conducts a quantitative analysis of p/n on the shell. The nuclide structure has the characteristic of a shell and on every shell the combination of proton and neutron features clear regularity. Among the 263 elements from 11 H to 263106 Sg the serial number of the most outside shell in structure are 7, and nuclides 262105 Ha and 263106 Sg are respectively even A and odd A 7 shells. It is not a coincidence but a reflection of the nuclide shell structure. The thesis uses the result of a statistical analysis to confirm the existence of “the magic Number” and reveals the fact that the magic number” is a reflection of p/n on nuclide shell, particularly on the outer shells. The statistical analysis reveals that the nuclide stability and its way of decay are dependent on the nucleonic combination on the most outside shell and the matching between full-filled and semi-full filled p/n, thus unveiling the general law governing the stability and decay of nuclides.
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Skovsted, Christian B., and John S. Peel. "Early Cambrian brachiopods and other shelly fossils from the basal Kinzers Formation of Pennsylvania." Journal of Paleontology 84, no. 4 (2010): 754–62. http://dx.doi.org/10.1017/s0022336000058467.

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An assemblage of seventeen species of Small Shelly Fossils, dominated by the brachiopod Eothele tubulus and species of the mollusk Yochelcionella, is described from the basal Kinzers Formation of Thomasville, Pennsylvania. The occurrence extends southwards the distribution of an Early Cambrian fauna (Cambrian Series 2, Stage 4) that is otherwise characteristic of the eastern shelf of Laurentia from New York to Greenland. The poorly known acrothelid brachiopod Eothele tubulus is redescribed based on large collections of ventral valves. The shell structure of E. tubulus is characterized by orthogonal baculae, and represents the oldest known example of a baculate shell structure, indicating that this type of shell structure evolved already in the Early Cambrian.
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Bazhenov, Viktor, Olga Krivenko, and Andrii Kozak. "Modal analysis of a complex shell structure under operational loads." Strength of Materials and Theory of Structures, no. 106 (May 24, 2021): 5–13. http://dx.doi.org/10.32347/2410-2547.2021.106.5-13.

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The results of calculation of a complex shell structure under the action of operational loads are presented. A three-section cooling tower, called a three-petal cooling tower, is regarded as a complex-shaped structure. Three variants of loads on the shell are considered: wind pressure, heating and load combination. The design model of a shell of a complex shape is based on the developed universal spatial finite element. The universal spatial finite element allows one to take into account the geometric features of structural elements for a thin shell (constant or varying thickness, knees, ribs, cover plates, holes, cavities, channels, inserts, facets) and multilayer structure of the material. According to the method, thin and medium thickness shells of various shapes and structures are considered. The shells are under the action of static mechanical and temperature loads. The finite element method is based on the unified positions of the three-dimensional geometrically nonlinear theory of thermoelasticity and the moment finite element scheme. The method for determining the natural vibrations of thin-walled shell structures is based on an integrated approach. Modal analysis is carried out taking into account the prestressed and deformed states of the shell at each step of thermomechanical loading. Thus, the problem of determining the natural frequencies and vibration modes of the shell is solved by the step method in two stages.
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Ding, Xiao Fei, Ling Jiang, Yan Liang, and Cheng Wei Wu. "The Structure and Mechanical Properties of Turtle Shell and Biomimetic." Advanced Materials Research 189-193 (February 2011): 3419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3419.

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There are many types of shells in the world of biology such as various egg shells, conch shells, tortoise shells and skulls of human, all of them are one kind of thin shell structure with uniform curvature and lightsome of texture. This structure is not only light but also has a good pressure resistance. The composition, microstructure, and three-point bending properties of the turtle shell are studied in the paper. The results show that the turtle shell is composed of the element of Ca, P, C, Cl and Na etc. There are many pores in the turtle shell, and the cortical outer layer and spongy inner layer with collagen fiber winding. The middle layer with many pores absorbs energy and lower the load when acts on it. Therefore, the shell can protect the soft tissue of turtles. The multi-layer and porous structure will provide basis for design of biomimetic such as lightweight composite damping materials.
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Chernobryvko, Marina V., Konstantin V. Avramov, Valentina N. Romanenko, Tatiana J. Batutina, and Ulan S. Suleimenov. "Dynamic instability of ring-stiffened conical thin-walled rocket fairing in supersonic gas stream." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 1 (2015): 55–68. http://dx.doi.org/10.1177/0954406215592171.

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The assumed-modes method is applied to obtain the dynamical model of the ring-stiffened conical shells in a supersonic gas stream. The pressure acting on the shell is described by the piston theory. The displacements of the rings are functions of the shell displacements. The kinetic and the potential energies of the structure are obtained as the functions of the shell displacements. It is suggested the approach to calculate the shell spatial mode, when the shell dynamic stability is lost. The free vibrations of the structures with different numbers of the rings are analyzed. The loss of the structure dynamic stability is investigated.
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Pasternak, Hartmut, Zheng Li, Algirdas Juozapaitis, and Alfonsas Daniūnas. "Ring Stiffened Cylindrical Shell Structures: State-of-the-Art Review." Applied Sciences 12, no. 22 (2022): 11665. http://dx.doi.org/10.3390/app122211665.

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The cylindrical shell is a widely used structure in engineering practice, and its main form of failure is instability due to buckling. As a classical problem in the field of mechanics, the stability of cylindrical shells has been studied extensively. However, the large difference between the theoretically predicted results of the critical buckling load and the experimental results for the cylindrical shells subjected to uniform axial pressure has contributed to the continuous development of the shell stability theory. This paper briefly reviews the development of the shell stability theory, then presents an overview of the current status and trends of stability research on the stiffened cylindrical shell widely used in cylindrical shell structures in real engineering, and finally presents the difficulties and directions of future stability research on cylindrical shell structures in engineering applications.
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Hambric, Stephen. "Practical Tutorial on cylindrical structure vibro-acoustics Part 1 - Vibrations." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 140–49. http://dx.doi.org/10.3397/in_2022_0026.

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The mathematics which describe the vibroacoustic behavior of cylindrical structures are imposing to say the least. Part 1 of this practical tutorial demystifies cylindrical shell vibration theory by using measured data from actual shells and pipes to explain key concepts. For any shell, you can estimate frequency ranges where shells behave like simple beams and flat plates, greatly simplifying calculations of modes of vibration and mobilities. The key is first calculating the ring frequency - the frequency where membrane waves can propagate fully around the shell circumference. Simple infinite structure theory may then be used to compute mean mobilities for beam, shell, and flat plate behavior. Modes of vibration for a cylinder depend on both longitudinal and circumferential harmonics, or a helical wavenumber. Cremer's simple approximate resonance frequency formula is used to show examples for a large diameter short shell and a small diameter long shell (a pipe). Finally, the measured modal densities of an elbowed pipe are compared to estimates from an empirical expression for modal density of a shell. In all cases in this tutorial, measurements and simple estimates agree well, showing that cylindrical shell vibrations may be estimated without difficult math or complex computer models.
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Krivenko, Olha, Yurii Vorona, and Andrii Kozak. "Finite element analysis of nonlinear deformation, stability and vibrations of elastic thin-walled structures." Strength of Materials and Theory of Structures, no. 107 (October 29, 2021): 20–34. http://dx.doi.org/10.32347/2410-2547.2021.107.20-34.

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Thin-walled shell-type structures are widely used in various branches of technology and industry. Such structures under operating conditions are usually exposed to various loads, including thermomechanical ones. Real shell structures, as a rule, have a complex shapes. To increase reliability, reduce material consumption, for technological reasons, they are designed as inhomogeneous systems in thickness. This causes a great and constant interest of engineers and designers in the problems of investigating the behavior of elastic thin-walled shell structures.
 The work is devoted to the method of analysis of geometrically nonlinear deformation, stability, post-buckling behavior and natural vibrations of thin elastic shells of complex shape and structure under the action of static thermomechanical loads. The unified design model has been created on the basis of the developed universal spatial finite element with introduced additional variable parameters. The model takes into account the multilayer material structure and geometric features for structural elements of the thin shell. The shells can be reinforced with ribs and cover plates, weakened by cavities, channels and holes, have sharp bends in the mid-surface.
 Such a uniform formulation made it possible to create a unified finite element model of the shells with an inhomogeneous structure. It is shown on a number of problems that the method presented in this article is an effective tool for analyzing geometrically nonlinear deformation, stability, post-buckling behavior and natural vibrations of thin elastic shells of an inhomogeneous structure under the action of static thermomechanical loads.
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Zhao, Ming Hui. "Vibration Analysis of a Shell Structure by Finite Element Method." Advanced Materials Research 591-593 (November 2012): 1929–33. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1929.

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Plate-shell structures, especially cylindrical shells and spherical shells, are widely used in engineering fields, such as aircraft and tanks, missiles, submarines, ships, hydraulic pumps, infusion pipelines and gas pipelines, and so on. These structures are usually in a fluid medium, which are related to the structure fluid-solid coupling and acoustic radiation field. As many experiments show that enclosed air in a thin walled structure, just like the violin, affects some modes of vibration significantly, air coupling between vibrating sides of the structure cannot be neglected. In order to explore the sound pressure distribution of vibrational frequencies, this paper, considering the material anisotropy, analyzes a typical complex shell structure of the violin by finite element method, including acoustic-structure coupling analysis and post-processing, especially sound pressure vibration frequency extraction. Finally, we get the conclusion that the distribution of sound pressure vibration frequency is similar to the normal distribution.
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Dissertations / Theses on the topic "Shell structure"

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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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Mousa, A. I. "Finite element analysis of shell structure." Thesis, Cardiff University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.532180.

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Valdés, Vázquez Jesús Gerardo. "Nonlinear Analysis of Orthotropic Membrane and Shell Structures Including Fluid-Structure Interaction." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/6866.

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Problemas de interacciónn fluido-estructura representan hoy en día un gran desafío en diferentes áreas de ingeniería y ciencias aplicadas. Dentro de las aplicaciones en ingeniería civil, el flujo del viento y los movimientos estructurales pueden ocasionar inestabilidades aeroelásticas en construcciones tales como puentes de gran luz, rascacielos y cubiertas estructurales ligeras. Por otro lado, aplicaciones en biomecánica están interesadas en el estudio de hemodinámica, por ejemplo: flujo sanguíneo en arterias, donde grandes deformaciones de las venas interactúan con fluidos.En la parte estructural de este trabajo, una nueva metodología para el análisis geométricamente no-lineal ortótropo de membranas y láminas sin grados de libertad de rotación es desarrollada basándose en la orientación de la fibra principal del material. Una consecuencia directa de la estrategia de orientación de fibras es la posibilidad de analizar membranas y láminas pretensadas cuya configuración inicial está fuera del plano. Por otra parte, ya que la teoría convencional de membranas permite que existan tensiones de compresión, un modelo de arrugado basado en la modificación de la ecuación constitutiva se presenta. El desarrollo estructural es modelado con elementos finitos provenientes de las ecuaciones de la elastodinámica.<br/>La parte de fluidos de este trabajo está gobernada por las ecuaciones de Navier-<br/>Stokes para flujos incompresibles, las cuales son modeladas por interpolaciones estabilizadas de elementos finitos. Ya que la solución monolítica de dichas ecuaciones tiene la desventaja que consumen mucho tiempo en la solución de grandes sistemas de ecuaciones, el método de pasos fraccionados se usa para aprovechar las ventajas computacionales que brinda gracias al desacoplamiento de la presión del campo de las velocidades. Además, el esquema &#945;-generalizado para integración en el tiempo para fluidos es adaptado para que se use con la t´ecnica de los pasos fraccionados.<br/>El problema de interacción fluido-estructura es formulado como un sistema de tres campos: la estructura, el fluido y el movimiento de la malla. El movimiento del dominio del fluido es tomado en cuenta mediante la formulación arbitraria Lagrangiana-Euleriana, para la cual se usan dos estrategias de movimiento de malla.<br/>Para el acoplamiento entre el fluido y la estructura se usa un acoplamiento fuerte por bloques usando la técnica de Gauss-Seidel. Debido a que la interacción entre el fluido y la estructura es altamente no-lineal, se implementa el método de relajación basado en la técnica de Aitken, la cual acelera la convergencia del problema.<br/>Finalmente varios problemas se presentan en los diferentes campos, los cuales verifican la eficiencia de los algoritmos implementados.<br>Nowadays, fluid-structure interaction problems are a great challenge of different fields in engineering and applied sciences. In civil engineering applications, wind flow and structural motion may lead to aeroelastic instabilities on constructions such as long-span bridges, high-rise buildings and light-weight roof structures. On the other hand, biomechanical applications are interested in the study of hemodynamics, i.e. blood flow through large arteries, where large structural membrane deformations interact with incompressible fluids.<br/>In the structural part of this work, a new methodology for the analysis of geometrically nonlinear orthotropic membrane and rotation-free shell elements is developed based on the principal fiber orientation of the material. A direct consequence of the fiber orientation strategy is the possibility to analyze initially out-ofplane prestressed membrane and shell structures. Additionally, since conventional membrane theory allows compression stresses, a wrinkling algorithm based on modifying the constitutive equation is presented. The structure is modeled with finite elements emerging from the governing equations of elastodynamics.<br/>The fluid portion of this work is governed by the incompressible Navier-Stokes equations, which are modeled by stabilized equal-order interpolation finite elements.<br/>Since the monolithic solution for these equations has the disadvantage that take great computer effort to solve large algebraic system of equations, the fractional step methodology is used to take advantage of the computational efficiency given by the uncoupling of the pressure from the velocity field. In addition, the generalized-&#945; time integration scheme for fluids is adapted to be used with the fractional step technique.<br/>The fluid-structure interaction problem is formulated as a three-field system: the structure, the fluid and the moving fluid mesh solver. Motion of the fluid domain is accounted for with the arbitrary Lagrangian-Eulerian formulation with two different mesh update strategies. The coupling between the fluid and the structure is performed with the strong coupling block Gauss-Seidel partitioned technique.<br/>Since the fluid-structure interaction problem is highly nonlinear, a relaxation technique based on Aitken's method is implemented in the strong coupling formulation to accelerate the convergence.<br/>Finally several example problems are presented in each field to verify the robustness and efficiency of the overall algorithm, many of them validated with reference solutions.
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Tanaka, Kaori. "Shell structure and classical orbits in mesoscopic systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30172.pdf.

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Krämer, Tobias. "Electronic structure of open-shell transition metal complexes." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:1f4a1330-281d-4696-b3e6-62b76fb41d65.

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This thesis presents electronic structure calculations on problems related to the bonding in inorganic coordination compounds and clusters. A wide range of molecules with the ability to exist in different structural forms or electronic states has been selected and density functional theory is systematically applied in order to gain detailed insight into their characteristics and reactivity at the electronic level. First, we address the question of redox non-innocent behaviour of bipyridine in a series of 1st row transition metal complexes. Complexes of the type [M(2,2'-bipyridine)(mes)₂]<sup>0</sup> (M = Cr, Mn, Fe, Co, Ni; mes = 2,4,6-Me₃C6H₂) and their one-electron reduced forms have been explored. The results clearly show that the anions are best described as complexes of the monoanionic bipyridine radical (S<sub>bpy</sub> = 1/2), giving a rationale for the observed structural changes within the ligand. Likewise, we have identified dianionic bipyridine in both the complexes [Zn2(4,4'-bpy)(mes)₄]²<sup>−</sup> and [Fe(2,2'-bpy)₂]²<sup>−</sup>. In no case have we found evidence for significant metal-to-ligand backbonding. The subject of redox-noninnocence is further revisited in a comparative study of the two complexes [M(o-Clpap)₃] (M = Cr, Mo; o-Clpap = 2-[(2-chloro-phenyl)azo]-pyridine), and their associated electron transfer series. The results indicate that all electron transfer processes are primarily ligand-based, although in the case of the Mo analogue these are coupled to substantial electron density changes at the metal. The ability of pap to form radical anions finds a contrasting case in the di- nuclear Rh complex [Rh₂(μ-p-Clpap)₂ (cod)Cl₂], where the two ligand bridges act as acceptors of strong dπ∗ backbonding from a formally Rh<sup>–I</sup> centre. We then direct our attention to the endohedral Zintl clusters [Fe@Ge<sub>10</sub>]³<sup>−</sup> and [Mn@Pb<sub>12</sub>]³<sup>−</sup>, which reveal peculiar topologies. We have probed the electronic factors that influence their geometric preferences, and propose a model based on the shift of electron density from the endo- hedral metal to the cage to account for the observed geometries. Subsequently, we reassess the electronic structure of the xenophilic clusters Mn₂(thf)₄(Fe(CO)₄)₂ and [Mn(Mn(thf)₂)₃(Mn(CO)₄)₃]<sup>–</sup>. We conclude that these are best viewed as exchange coupled Mn<sup>II</sup> centres bridged by closed- shell carbonylate fragments. In the closing chapter the reduction of NO₂<sup>–</sup> to NO by the complex [Cu(tct)(NO₂)]<sup>+</sup> (tct = cis,cis-1,3,5-tris(cinnamylideneamino)cyclohexane) is studied, a process that mimics the enzyme-catalysed reaction. Two viable pathways for the reaction have been traced and key inter-mediates identified. Both direct release of NO or via decomposition of a Cu-NO complex are kinetically and thermodynamically feasible.
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Hu, Bin. "Stability analysis of linear thin shells." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7360/.

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Shell structure is widely used in engineering area. The purpose of this dissertation is to show the behavior of a thin shell under external load, especially for long cylindrical shell under compressive load, I analyzed not only for linear elastic problem and also for buckling problem, and by using finite element analysis it shows that the imperfection of a cylinder could affect the critical load which means the buckling capability of this cylinder. For linear elastic problem, I compared the theoretical results with the results got from Straus7 and Abaqus, and the results are really close. For the buckling problem I did the same: compared the theoretical and Abaqus results, the error is less than 1%, but in reality, it’s not possible to reach the theoretical buckling capability due to the imperfection of the cylinder, so I put different imperfection for the cylinder in Abaqus, and found out that with the increasing of the percentage of imperfection, the buckling capability decreases, for example 10% imperfection could decrease 40% of the buckling capability, and the outcome meet the buckling behavior in reality.
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Wang, Xiaoyan. "Investigation of 3D Shell Structure Nonwoven Processes and Products." Thesis, University of Manchester, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527410.

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Economides, George. "Investigations of open-shell open-shell Van der Waals complexes." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:e27330e0-2eaa-4181-af30-70e8b7a3a692.

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The question posed in this work is how one would model and predict the rotational spectrum of open-shell open-shell van der Waals complexes. There are two secondary questions that arise: the nature of radical-radical interactions in such systems and the modelling of the large amplitude motion of the constituent molecules. Four different systems were studied in this work, each providing part of the answer to the main question. Starting with the large amplitude motion, there are two theoretical approaches that may be adopted: to either model the whole complex as a semi-rigid molecule, or to perform quantum dynamical calculations. We recorded and analysed the rotational spectrum (using Fourier transform microwave spectroscopy) of the molecule of tertiary butyl acetate (TBAc) which exhibits a high degree of internal rotation; and of the weakly-bound complex between a neon atom and a nitrogen dioxide molecule (Ne-NO2). We used the semi-rigid approach for TBAc and the quantum dynamical approach for Ne-NO2. We also explored the compatibility of these two approaches. Moreover, we were able to predict and analyse the fine and hyperfine structure of the Ne-NO2 spectrum using spherical tensor operator algebra and the results of our dynamics calculations. To explore the nature of the interactions in an radical-radical van der Waals complex we calculated the PESs of the possible states that the complex may be formed in, when an oxygen and a nitrogen monoxide molecule meet on a plane using a number of high level ab initio methods. Finally, our conclusions were tested and applied when we performed the angular quantum dynamics to predict the rotational spectrum of the complex between an oxygen and a nitrogen dioxide molecule, and account for the effect of nuclear spin statistics in that system.
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Georgiadou, Anastasia. "Transfer Reactions Induced with 56Ni : Pairing and N=28 Shell Closure." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS294/document.

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La structure du noyau N = Z doublement magique 56Ni (N = 28, Z = 28) a été étudiée en mesurant les réactions de transfert á un et deux nucléons. Le transfert nous donne des informations sur deux aspects physiques différents: la fermeture de couche N=28 et l’intensité de l’appariement neutron-proton. Le nombre magique N=28 est particulier, car c’est le premier créé par le spin-orbit. La double magicité permet la détermination de la nature de particule indépendante des voisins N±1 par réaction de transfert d’un nucléon. De plus, en tant que noyau N=Z a couches fermeés, le 56Ni est un noyau clé pour l’étude de l’apparement np dans la plus grande couche accessible expérimentalement. L’apparement np se manifeste dans le canal isoscalaire (T=0) et isovecteur (T=1). L’intensité relative de chaque canal révèle la nature collective des états. L’expérience de ce travail a eu lieu au GANIL-Caen, en France, avec un faisceau radioactif de 56Ni á 30MeV / u produit par frag- mentation de 58Ni et purification avec le spectromètreLISE. Les mesures ont été effectuées en cinématique inverse sur des cibles CH2 et CD2. Les détecteurs MUST2 et TIARA ont été utilisés pour la détection de éjectiles légers et couvraient presque 4π. En outre, quatre détecteurs germanium d’EXOGAM ont été utilisés pour les coïncidences de particules-gamma afin d’identifier l’état peuplé du résidu de réaction. Pour étudier le gap de N=28, nous étudions la spectroscopie du 55Ni par les réactions de transfert de nucléons (d, t) et (p, d) sur le 56Ni. Le spectre en énergie d’excitation est déduit de la mesure des éjectiles légers seulement. Ensuite,les coincidences particule-gamma sont utilisées pour améliorer la résolution et identifier les principaux états peuplés. La comparaison des distributions angulaires ainsi obtenues avec des calculs DWBA permet d’extraire les facteurs spectroscopiques pour les états de particules et de trous ainsi peuplés. En ce qui concerne l’appariement np, nous avons analysé la réaction 56Ni(d,α)54Co qui réalise un transfert de paires neutron-proton. Un affaiblissement du canal T=0 á cause de l’effet du spin-orbite est attendu. La sélectivité en ∆T=0 de la réaction (d, α) permet d’étudier plus en détail le canal isoscalaire T = 0<br>The structure of the unstable doubly ma- gic nucleus 56Ni has been investigated by measuring one- and two-nucleon transfer reactions. Each trans- fer reaction provides information for two different physical aspects: the robustness of the N=28 shell gap and the strength of the neutron-proton pairing. 56Ni is a self-conjugate doubly magic nucleus with N=28 and Z=28. The magic number 28 is a peculiar shell closure created by spin-orbit splitting effects. The double magicity makes the determination of the single-particle nature of their N±1 neighbors by one-neutron transfer reaction of major interest to test both the robustness of shell closures as well as the evolution of particle and/or valence orbitals. Moreover 56Ni, as a N=Z nucleus with fully closed shells, is a key nucleus to investigate neutron-proton pairing in the largest shell accessible experimentally, the fp shell. Neutron-proton pairing can occur both in the isoscalar (T=0) and in the isovector (T=1) channels. The relative intensity of both channels reveals the collective nature of the states. The radioactive beam of 56Ni was produced at GANIL-Caen, France at 30 MeV/u by fragmentation of 58Ni and purification with the LISE spectrometer. The experimental set-up used, consists of the TIARA- MUST2-EXOGAM combination which provides an al- most 4π coverage and the ability to perform particle- γ coincidences. To probe the N=28 gap, we studied the spectroscopy of 55Ni through one-nucleon trans- fer reactions on 56Ni. The excitation energy spectrum is deduced by measuring the light ejectiles only, while particle-γ coincidences are used to improve the re- solution of the populated states and select the main ones. Comparison in between the extracted angular distributions and DWBA calculations allow the extraction of the spectroscopic strength of the hole- and particle- states populated by these one neutron pick- up reactions. As for neutron-proton pairing, a weakening of the strength is expected in the T=0 channel from previous results. The selectivity in ∆T=0 of the 56Ni(d,α)54Co reaction enables further investigation of the isoscalar channel contribution
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Gam, Ki Tak. "Structure-property relationship in core-shell rubber toughened epoxy nanocomposites." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/412.

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The structure-property relationships of epoxy nanocomposites with inorganic layer-structure nanofillers have been studied to obtain the fundamental understanding of the role of nanofillers and the physics of polymer nanocomposites in this dissertation. Several polymer nanocomposite systems with modified montmorillonite (MMT) or α-zirconium phosphate (ZrP) nanofillers were prepared with epoxy matrices of different ductility and properties. The successful nanofiller's exfoliations were confirmed with X-ray diffraction and transmision electronic microscopy (TEM). Dynamic mechanical analysis (DMA) on the prepared epoxy nanocomposites revealed the significant increase in rubbery plateau moduli of the epoxy nanocomposite systems above Tg, as high as 4.5 times, and tensile test results showed improved modulus by the nanofiller addition, while the fracture toughenss was not affected or slightly decreased by nanofillers. The brittle epoxy nanocomposite systems were toughened with core shell rubber (CSR) particles and showed remarkable increase in fracture toughness (KIC) value up to 270%. The CSR toughening is more effective at ductile matrices, and TEM observation indicates that major toughening mechanisms induced by the CSR addition involve a large scale CSR cavitation, followed by massive shear deformation of the matrix.
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Books on the topic "Shell structure"

1

The nuclear shell model. 2nd ed. Springer-Verlag, 1994.

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Heyde, Kris L. G. The nuclear shell model. Springer-Verlag, 1990.

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Nilsson, Sven Gösta. Shapes and shells in nuclear structure. Cambridge University Press, 1995.

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A, Covello, ed. Shell model and nuclear structure: Where do we stand? : 2nd International Spring Seminar on Nuclear Physics, Capri, Italy, 16-20 May, 1988. World Scientific, 1989.

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Paul J. J. Van Kampen. The outer shell spectra of argon and argon-like ions. University College Dublin, 1997.

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1927-, Křupka V., Drdácký M. 1945-, and International Union of Theoretical and Applied Mechanics., eds. Contact loading and local effects in thin-walled plated and and shell structures: IUTAM symposium, Prague, Czechslovakia, September 4-7, 1990. Springer-Verlag, 1992.

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Demidenko, V. N. Kolʹt͡s︡evye obolochki atomnykh i͡a︡der. [s.n.], 1992.

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R, Narayanan, ed. Shell structures. Elsevier Applied Science Publishers, 1985.

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N, Labzovskiĭ L., ed. Teorii͡a︡ atoma: Stroenie ėlektronnykh obolochek. "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1986.

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Ryaboy, V. M. A simple model of a stiffened shell type structure for an investigation into the vibration-buckling correlation. Technion Israel Institute of Technology, Faculty of Aerospace Engineering, 1994.

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Book chapters on the topic "Shell structure"

1

Takigawa, Noboru, and Kouhei Washiyama. "Shell Structure." In Fundamentals of Nuclear Physics. Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-55378-6_5.

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Okumoto, Yasuhisa, Yu Takeda, Masaki Mano, and Tetsuo Okada. "Shell Structure." In Design of Ship Hull Structures. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88445-3_23.

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Rigamonti, Attilio, and Pietro Carretta. "The shell vectorial model." In Structure of Matter. Springer Milan, 2007. http://dx.doi.org/10.1007/978-88-470-0560-0_3.

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Rigamonti, Attilio, and Pietro Carretta. "The Shell Vectorial Model." In Structure of Matter. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17897-4_3.

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Rigamonti, Attilio, and Pietro Carretta. "The shell vectorial model." In Structure of Matter. Springer Milan, 2009. http://dx.doi.org/10.1007/978-88-470-1129-8_3.

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Zhang, Rongqing, Liping Xie, and Zhenguang Yan. "Study of Shell Structure." In Biomineralization Mechanism of the Pearl Oyster, Pinctada fucata. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1459-9_8.

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Cohen, M. L. "Shell Structure in Clusters." In Springer Series in Materials Science. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-83064-8_1.

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Wang, Lingzhi, and Jinlong Zhang. "Synthesis of Yolk-Shell Structured Fe3O4@Void@CdS Nanoparticles: A General and Effective Structure Design for Photo-Fenton Reaction." In Core-Shell and Yolk-Shell Nanocatalysts. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0463-8_28.

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Michel, Nicolas, and Marek Płoszajczak. "The Unification of Structure and Reaction Frameworks." In Gamow Shell Model. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69356-5_9.

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Tanaka, Atsuhiro, and Hiroshi Kominami. "Functionalization of Plasmonic Photocatalysts by the Introduction of Core–Shell Structure." In Core-Shell and Yolk-Shell Nanocatalysts. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0463-8_16.

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Conference papers on the topic "Shell structure"

1

Barrett, B. R., P. Navrátil, M. J. Thoresen, and W. E. Ormand. "Large-basis no-core shell-model calculations for p-shell nuclei." In Nuclear structure 98. AIP, 1999. http://dx.doi.org/10.1063/1.59512.

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Knight, Jr., N. "The Raasch challenge for shell elements." In 37th Structure, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1369.

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PALAZOTTO, A., and J. OLSEN. "The analysis of a composite shell structure." In 30th Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-1297.

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YIN, DAH, and MARK RAUSCHER. "Space Shuttle shell structure waffle panel optimization." In 33rd Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-2359.

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Grant, I. P. "Relativistic atomic structure and electron–atom collisions." In X-ray and inner-shell processes. AIP, 1990. http://dx.doi.org/10.1063/1.39829.

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MILLENER, D. J. "STRUCTURE OF P-SHELL HYPERNUCLEI." In Proceedings of the APCTP Workshop (SNP '99). WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812792570_0011.

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Tseng, Ching-Yun, Chung-Chieh Cheng, Yen-Cheng Lu, Hu Che-Chen, Yu-Ting Sheng, and Shih-Yuan Wang. "Shell Structure of Bamboo Composite." In XXVI International Conference of the Iberoamerican Society of Digital Graphics. Editora Blucher, 2023. http://dx.doi.org/10.5151/sigradi2022-sigradi2022_103.

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Vazquez, Alicia Nahmad, Chikara Inamura, Joshua Zabel, Mostafa El Sayed, Asbjorn Sondergaard, and Shajay Bhooshan. "Topologically Optimized Concrete Shell Structure." In ACADIA 2014: Design Agency. ACADIA, 2014. http://dx.doi.org/10.52842/conf.acadia.2014.031.

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Vazquez, Alicia Nahmad, Chikara Inamura, Joshua Zabel, Mostafa El Sayed, Asbjorn Sondergaard, and Shajay Bhooshan. "Topologically Optimized Concrete Shell Structure." In ACADIA 2014: Design Agency. ACADIA, 2014. http://dx.doi.org/10.52842/conf.acadia.2014.031.

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Otsuka, Takaharu. "Frontiers Of The Nuclear Shell Model." In FRONTIERS OF NUCLEAR STRUCTURE. AIP, 2003. http://dx.doi.org/10.1063/1.1556641.

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Reports on the topic "Shell structure"

1

Jing, Kexing. I. Fission Probabilities, Fission Barriers, and Shell Effects. II. Particle Structure Functions. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/760325.

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Edwards, A. Seismic Reprocessing Results For Shell Canada Line M - 105 Montagnais Structure Offshore Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/127799.

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Edwards, A. Seismic Reprocessing Results For Shell Canada Line M-105, Montagnais Structure Offshore Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130780.

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MACKEY, T. C. HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT DYTRAN ANALYSIS OF SEISMICALLY INDUCED FLUID STRUCTURE INTERACTION IN A HANFORD DOUBLE SHELL PRIMARY TANK. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/878175.

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Giller, R. A., and E. O. Weiner. Soil structure interaction analysis for the Hanford Site 241-SY-101 double-shell waste storage tanks. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6022233.

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Giller, R. A., and E. O. Weiner. Soil structure interaction analysis for the Hanford Site 241-SY-101 double-shell waste storage tanks. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6178614.

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Del Grande, N. L shell XANES (x-ray absorption near edge structure) for solid metals: Ti, V, Cr, Fe, Ni, Cu. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/7253344.

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Nema, Arpit, and Jose Restrep. Low Seismic Damage Columns for Accelerated Bridge Construction. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2020. http://dx.doi.org/10.55461/zisp3722.

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This report describes the design, construction, and shaking table response and computation simulation of a Low Seismic-Damage Bridge Bent built using Accelerated Bridge Construction methods. The proposed bent combines precast post-tensioned columns with precast foundation and bent cap to simplify off- and on-site construction burdens and minimize earthquake-induced damage and associated repair costs. Each column consists of reinforced concrete cast inside a cylindrical steel shell, which acts as the formwork, and the confining and shear reinforcement. The column steel shell is engineered to facilitate the formation of a rocking interface for concentrating the deformation demands in the columns, thereby reducing earthquake-induced damage. The precast foundation and bent cap have corrugated-metal-duct lined sockets, where the columns will be placed and grouted on-site to form the column–beam joints. Large inelastic deformation demands in the structure are concentrated at the column–beam interfaces, which are designed to accommodate these demands with minimal structural damage. Longitudinal post-tensioned high-strength steel threaded bars, designed to respond elastically, ensure re-centering behavior. Internal mild steel reinforcing bars, debonded from the concrete at the interfaces, provide energy dissipation and impact mitigation.
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MACKEY TC, RINKER MW, and ABATT FG. HANFORD DST THERMAL & SEISMIC PROJECT DYTRAN ANALYSIS OF SEISMICALLY INDUCED FLUID STRUCTURE INTERACTION IN A HANFORD DOUBLE SHELL PRIMARY TANK. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/958408.

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MACKEY TC, ABATT FG, and RINKER MW. HANFORD DOUBLE-SHELL TANK THERMAL AND SEISMIC PROJECT DYTRAN BENCHMARK ANALYSIS OF SEISMICALLY INDUCED FLUID-STRUCTURE INTERACTION IN FLAT-TOP TANKS. Office of Scientific and Technical Information (OSTI), 2009. http://dx.doi.org/10.2172/963082.

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