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Academic literature on the topic 'Zig-zag theory'

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Published: 14 March 2023

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Journal articles on the topic "Zig-zag theory"

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Alvarado Cornejo, Marina d. A. "Zig-Zag y la irrupción editorial: La ciudad letrada “zigzagueante." Literatura y Lingüística, no. 23 (May 19, 2015): 81. http://dx.doi.org/10.29344/0717621x.23.111.

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ResumenEl objetivo de este trabajo es reconocer la importancia de la irrupción de la editorial Zig- Zag y su magazín homónimo en el proceso de legitimación y expansión de la producción literaria chilena durante las primeras dos décadas del siglo XX. Para esto, identificamos las estrategias desplegadas por la publicación semanal, las que analizamos a la luz de la noción “ciudad letrada” de Ángel Rama.Palabras clave: Editorial Zig-Zag, magazín Zig-Zag, legitimación de la producción literaria, “ciudad letrada”.Zig-Zag and the publishing emergence: The zigzagueante ciudad letradaAbstractThe aim of this paper is to recognize the importance of the emergence of Zig-Zag Publisher and its magazine with the same name, in the process of legitimation and expansion of the Chilean literary production during the first two decades of the twentieth century. For this purpose, we identify the strategies employedby the weekly publication, which are analyzed in light of the reappropriation of the notion of ciudad letrada by Angel Rama.Key words: Zig-Zag Publisher, magazíne Zig-Zag, legitimation of literary production,“ciudad letrada”.
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Kapuria, S. "A Coupled Zig-Zag Third-Order Theory for Piezoelectric Hybrid Cross-Ply Plates." Journal of Applied Mechanics 71, no. 5 (September 1, 2004): 604–14. http://dx.doi.org/10.1115/1.1767170.

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A new zig-zag coupled theory is developed for hybrid cross-ply plates with some piezoelectric layers using third-order zig-zag approximation for the inplane displacements and sublayer wise piecewise linear approximation for the electric potential. The theory considers all electric field components and can model open and closed-circuit boundary conditions. The deflection field accounts for the transverse normal strain due to the piezoelectric d33 coefficient. The displacement field is expressed in terms of five displacement variables (which are the same as in FSDT) and electric potential variables by satisfying exactly the conditions of zero shear stresses at the top and bottom, and their continuity at layer interfaces. The governing equations are derived from the principle of virtual work. Comparison of the Navier solutions for the simply-supported plates with the analytical three-dimensional piezoelasticity solutions establishes that the present efficient zig-zag theory is quite accurate for moderately thick plates.
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Aloui, Lobna, Thierry Dintzer, and Izabela Janowska. "Fe Atom—Mixed Edges Fractal Graphene via DFT Calculation." ChemEngineering 6, no. 5 (October 8, 2022): 79. http://dx.doi.org/10.3390/chemengineering6050079.

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The stability of small fractal graphene models with two different symmetries and Fe atoms at their mixed edges is addressed by density functional theory (DFT) calculations. Four kinds of edge configurations and Fe atom localizations are determined depending on the model. The edges have mixed configuration, the zig-zag and “intra-zig-zag” in symmetrical structures and armchair and zig-zag type in the architectures with rotational symmetry. The rotational symmetry graphene exhibits slightly higher stability per carbon atom compared to the symmetrical model, while the localization of Fe atoms is more favorable at armchair and “inversed zigzag” than at zigzag type carbon termination. Larger graphene structures with rotational symmetry were observed previously via experimental cutting of graphene with Fe nanoparticles (NPs).
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Ganor, Yaniv, Traian Dumitrică, Fan Feng, and Richard D. James. "Zig-zag twins and helical phase transformations." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2066 (April 28, 2016): 20150208. http://dx.doi.org/10.1098/rsta.2015.0208.

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We demonstrate the large bending deformation induced by an array of permanent magnets (applied field ∼0.02 T) designed to minimize poles in the bent state of the crystal. Planar cantilevers of NiMnGa (5M modulated martensite) ferromagnetic shape memory alloy deform into an arched shape according to theory, with a zig-zag microstructure that complies with the kinematic and magnetic compatibility between adjacent twin variants. A general theory of bent and twisted states is given, applicable to both twinning and austenite/martensite transformations. Some of these configurations achieve order-of-magnitude amplification of rotation and axial strain. We investigate also atomistic analogues of these bent and twisted configurations with perfect interfaces between phases. These mechanisms of large deformation, induced by small magnetic fields or temperature changes, have potential application to the development of new actuation technologies for micro-robotic systems.
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Cho, M., and J. S. Kim. "Higher-Order Zig-Zag Theory for Laminated Composites With Multiple Delaminations." Journal of Applied Mechanics 68, no. 6 (October 19, 2000): 869–77. http://dx.doi.org/10.1115/1.1406959.

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A higher-order zig-zag theory has been developed for laminated composite plates with multiple delaminations. By imposing top and bottom surface transverse shear stress-free conditions and interface continuity conditions of transverse shear stresses including delaminated interfaces, the displacement field with minimal degree-of-freedoms are obtained. This displacement field can systematically handle the number, shape, size, and locations of delaminations. Through the dynamic version of variational approach, the dynamic equilibrium equations and variationally consistent boundary conditions are obtained. The delaminated beam finite element is implemented to evaluate the performance of the newly developed theory. Linear buckling and natural frequency analysis demonstrate the accuracy and efficiency of the present theory. The present higher-order zig-zag theory should work as an efficient tool to analyze the static and dynamic behavior of the composite plates with multiple delaminations.
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Kratzer, Peter, Sherif Abdulkader Tawfik, Xiang Yuan Cui, and Catherine Stampfl. "Detection of adsorbed transition-metal porphyrins by spin-dependent conductance of graphene nanoribbon." RSC Advances 7, no. 46 (2017): 29112–21. http://dx.doi.org/10.1039/c7ra04594h.

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XIE, ZHIFENG. "NULL ZIG-ZAG WILSON LOOPS IN $\mathcal{N}=4$ SYM." Modern Physics Letters A 25, no. 08 (March 14, 2010): 627–39. http://dx.doi.org/10.1142/s0217732310032093.

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In planar [Formula: see text] supersymmetric Yang–Mills theory we have studied one kind of (locally) BPS Wilson loops composed of a large number of light-like segments, i.e. null zig-zags. These contours oscillate around smooth underlying spacelike paths. At one-loop in perturbation theory, we have compared the finite part of the expectation value of null zig-zags to the finite part of the expectation value of non-scalar-coupled Wilson loops whose contours are the underlying smooth spacelike paths. In arXiv:0710.1060 [hep-th] it was argued that these quantities are equal for the case of a rectangular Wilson loop. Here we present a modest extension of this result to zig-zags of circular shape and zig-zags following non-parallel, disconnected line segments and show analytically that the one-loop finite part is indeed that given by the smooth spacelike Wilson loop without coupling to scalars which the zig-zag contour approximates. We make some comments regarding the generalization to arbitrary shapes.
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Zhang, Z. C., X. L. Liu, L. Y. Hu, Y. Wang, W. Q. Chen, and R. Q. Xu. "Zig-zag theory for concrete beams with corrugated steel webs." Engineering Structures 258 (May 2022): 114100. http://dx.doi.org/10.1016/j.engstruct.2022.114100.

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Van Der Poorten, A. J. "Generalised simultaneous approximation of functions." Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics 51, no. 1 (August 1991): 50–61. http://dx.doi.org/10.1017/s1446788700033292.

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AbstractWe generalise the approximation theory described in Mahier's paper “Perfect Systems” to linked simultaneous approximations and prove the existence of nonsingular approximation and of transfer matrices by generalising Coates' normality zig-zag theorem. The theory sketched here may have application to constructions important in the theory of diophantine approximation.
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González-Durruthy, Michael, Adriano V. Werhli, Luisa Cornetet, Karina S. Machado, Humberto González-Díaz, Wilson Wasiliesky, Caroline Pires Ruas, Marcos A. Gelesky, and José M. Monserrat. "Predicting the binding properties of single walled carbon nanotubes (SWCNT) with an ADP/ATP mitochondrial carrier using molecular docking, chemoinformatics, and nano-QSBR perturbation theory." RSC Advances 6, no. 63 (2016): 58680–93. http://dx.doi.org/10.1039/c6ra08883j.

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Interactions between single walled carbon nanotubes (SWCNT) family with mitochondrial ADP/ATP carrier (ANT-1) were evaluated using constitutional and electronic nanodescriptors defined by (n, m)-Hamada indexes (armchair, zig-zag and chiral).
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Dissertations / Theses on the topic "Zig-zag theory"

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Nygren, Clara. "On Meyniel's conjecture and the Zig-Zag Theorem : Cops and robbers on random graphs." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-175951.

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This essay will present the vertex pursuit game of cops and robbers and the problem that made it famous: Meinyel's conjecture. The conjecture stood unproved from 1987 until 2010 when Łuczak and Prałat proved the conjecture with their "Zig-Zag Theorem", which is also covered in the essay.
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Kennington, Raymond William. "Random allocations: new and extended models and techniques with applications and numerics." 2007. http://hdl.handle.net/2440/41885.

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This thesis provides a general methodology for classifying and describing many combinatoric problems, systematising and finding theoretical expressions for quantities of interest, and investigating their feasible numerical evaluation. Unifying notation and definitions are provided. Our knowledge of random allocations is also extended. This is achieved by investigating new processes, generalising known processes, and by providing a formal structure and innovative techniques for analysing them. The random allocation models described in this thesis can be classified as occupancy urn models, in which we have a sequence of urns and throw balls into them, and investigate static, waiting-time and dynamic processes. Various structures are placed on the relationship(s) between cells, balls, and the selection of items being distributed, including varieties, batch arrivals, taboo sets and blocking sets. Static, waiting-time and dynamic processes are investigated. Both without-replacement and with-replacement sampling types are considered. Emphasis is placed on the distributions of waiting-times for one or more events to occur measured from the time a particular event occurs; this begins as an abstraction and generalisation of a model of departures of cars parked in lanes. One of several additional determinations is the platoon size distribution. Models are analysed using combinatorial analysis and Markov Chains. Global attributes are measured, including maximum waits, maximum room required, moments and the clustering of completions. Various conversion formulae have been devised to reduce calculation times by several orders of magnitude. New and extended applications include Queueing in Lanes, Cake Displays, Coupon Collector's Problem, Sock-Sorting, Matching Dependent Sets (including Genetic Code Attribute Matching and the game SET), the Zig-Zag Problem, Testing for Randomness (including the Cake Display Test, which is a without-replacement test similar to the standard Empty Cell test), Waiting for Luggage at an Airport, Breakdowns in a Network, Learning Theory and Estimating the Number of Skeletons at an Archaeological Dig. Fundamental, reduction and covering theorems provide ways to reduce the number of calculations required. New combinatorial identities are discovered and a well-known one is proved in a combinatorial way for the first time. Some known results are derived from simple cases of the general models.
http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1309598
Thesis (Ph.D.) -- University of Adelaide, School of Mathematical Sciences, 2007
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Kennington, Raymond William. "Random allocations: new and extended models and techniques with applications and numerics." Thesis, 2007. http://hdl.handle.net/2440/41885.

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This thesis provides a general methodology for classifying and describing many combinatoric problems, systematising and finding theoretical expressions for quantities of interest, and investigating their feasible numerical evaluation. Unifying notation and definitions are provided. Our knowledge of random allocations is also extended. This is achieved by investigating new processes, generalising known processes, and by providing a formal structure and innovative techniques for analysing them. The random allocation models described in this thesis can be classified as occupancy urn models, in which we have a sequence of urns and throw balls into them, and investigate static, waiting-time and dynamic processes. Various structures are placed on the relationship(s) between cells, balls, and the selection of items being distributed, including varieties, batch arrivals, taboo sets and blocking sets. Static, waiting-time and dynamic processes are investigated. Both without-replacement and with-replacement sampling types are considered. Emphasis is placed on the distributions of waiting-times for one or more events to occur measured from the time a particular event occurs; this begins as an abstraction and generalisation of a model of departures of cars parked in lanes. One of several additional determinations is the platoon size distribution. Models are analysed using combinatorial analysis and Markov Chains. Global attributes are measured, including maximum waits, maximum room required, moments and the clustering of completions. Various conversion formulae have been devised to reduce calculation times by several orders of magnitude. New and extended applications include Queueing in Lanes, Cake Displays, Coupon Collector's Problem, Sock-Sorting, Matching Dependent Sets (including Genetic Code Attribute Matching and the game SET), the Zig-Zag Problem, Testing for Randomness (including the Cake Display Test, which is a without-replacement test similar to the standard Empty Cell test), Waiting for Luggage at an Airport, Breakdowns in a Network, Learning Theory and Estimating the Number of Skeletons at an Archaeological Dig. Fundamental, reduction and covering theorems provide ways to reduce the number of calculations required. New combinatorial identities are discovered and a well-known one is proved in a combinatorial way for the first time. Some known results are derived from simple cases of the general models.
Thesis (Ph.D.) -- University of Adelaide, School of Mathematical Sciences, 2007
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Book chapters on the topic "Zig-zag theory"

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Geraci, Carlo. "Phase theory, linearization and zig-zag movement." In Explorations of Phase Theory: Interpretation at the Interfaces, 133–60. Berlin, New York: Mouton de Gruyter, 2009. http://dx.doi.org/10.1515/9783110213959.133.

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Gomes, Ivan Lima. "Reshaping Comic Books in a Socialist Regime." In The Comics World, 72–88. University Press of Mississippi, 2021. http://dx.doi.org/10.14325/mississippi/9781496834645.003.0005.

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The nearly one thousand days of Salvador Allende’s socialist government in Chile (1970–1973) are remembered as one of the twentieth century’s most significant experiences of left-wing national rule in Latin America. During that period, one of the region’s largest publishers, Zig-Zag, was acquired by the Unidad Popular (UP) government. Renamed Quimantú, it mounted an impressive publishing program, one which included comic books. In this chapter, Ivan Lima Gomes examines Quimantú’s theory of comics and its impact on Chile’s comics world, especially the influence of associated intellectuals like Armand Mattelart, Ariel Dorfman, and Manuel Jofré. An analysis of how Quimantú and its editorial line were created, and how it adapted the superhero genre to its mandate, reveals the historical peculiarities of UP’s cultural policy. These in turn helped establish and consolidate the "Chilean road to socialism" among youth, and its efforts to reshape the Chilean comics world.
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Cho, Maenghyo, Jinho Oh, Jun-Sik Kim, and Gun-In Kim. "Dynamic Analysis for Delaminated Composites with Arbitrary Shaped Multiple Delaminations Based on Higher-Order Zig-Zag Theory." In Composite Technologies for 2020, 249–54. Elsevier, 2004. http://dx.doi.org/10.1016/b978-1-85573-831-7.50055-9.

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E. Álvarez-Cisneros, Izyalith, Blanca E. Carvajal-Gámez, David Araujo-Díaz, Miguel A. Castillo-Martínez, and L. Méndez-Segundo. "Smart-Road: Road Damage Estimation Using a Mobile Device." In Visual Object Tracking [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.100289.

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Mexico is located on five tectonic plates, which when moving, generate telluric movements. These movements, depending on their intensity, affect the telecommunications infrastructure. Earthquakes tend to cause landslides, subsidence, damage to structures in houses, buildings, and roads. In the case of road damage, it is reflected in cracks in the pavement, which are classified according to their size, shape, and depth. The methods that are currently implemented to inspect roads mainly use human perception and are limited to a superficial inspection of the terrain, causing this process ineffective for the timely detection of damage. This work presents a method of road analysis using a drone to acquire images. For the processing and recognition of damages, a mobile device is used, allowing to determine the damage type on the road. Artificial intelligence techniques are implemented to classify them into linear cracks or zig-zag cracks.
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Conference papers on the topic "Zig-zag theory"

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Goodrich, Michael T. "Zig-zag sort." In STOC '14: Symposium on Theory of Computing. New York, NY, USA: ACM, 2014. http://dx.doi.org/10.1145/2591796.2591830.

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Cho, Maenghyo, and Jinho Oh. "Higher order zig-zag plate theory for coupled thermo-electric-mechanical smart structures." In 19th AIAA Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-1403.

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Baranski, Andrzej, and Sherrill Biggers, Jr. "Postbuckling analysis of delaminated composite plates using zig-zag theory with contact conditions." In 41st Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-1750.

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Averill, R., and Y. Yip. "An efficient thick beam theory and finite element model with zig-zag sublaminate approximations." In 36th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-1211.

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Oh, Jinho, and Maenghyo Cho. "Higher Order Zig-Zag Theory for Fully Coupled Thermo-Electric-Mechanical Smart Composite Shell." In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2263.

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Cho, Maenghyo, Jinho Oh, and Jun-Sik Kim. "Dynamic Analysis for Delaminated Composites Using DKQ Concept Based on Higher-Order Zig-Zag Theory." In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1684.

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Cho, Y. B., E. J. Plaskacz, R. C. Averill, and R. F. Kulak. "Explicit Dynamic Finite Element Analysis of Laminated Composite Automotive Structures Using a New Composite Plate Element." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1189.

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Abstract Composite materials are being considered for use in the front end structures of vehicles to help reduce overall vehicle mass and, thus, improve fuel efficiency. Acceptance of composite material in structural members will depend on their ability to do crash energy management. Numerical simulations can greatly aid in the design of these critical structures and reduce the number of crash tests. A new finite element, which is based on laminated plate theory with cubic zig-zag approximations, was developed to model the relevant mechanics that occur in composite materials during crash events. The element was cast in the internal force format for use with explicit integration solvers. In the plate theory, the in-plane displacement fields in a laminate are assumed to be piecewise cubic functions and vary in a zig-zag fashion through the thickness of the laminate. The zig-zag functions are obtained by satisfying the continuity of transverse shear stresses at layer interfaces. This in-plane displacement field assumption accounts for discrete layer effects without increasing the number of degrees of freedom as the number of layers is increased. The transverse normal strain predictions are improved by assuming a constant variation of transverse normal stress through the thickness in a laminate. The finite element is developed with the topology of an eight-noded brick. Each node has five engineering degrees of freedom, three translations and two rotations. Thus, this element can be conveniently implemented into general purpose finite element codes. Consistent and lumped mass matrices are derived. The developed element is implemented into Argonne National Laboratory’s in-house code, NEPTUNE, which utilizes explicit direct integration method. In NEPTUNE the internal force vector is calculated from the developed element at each time step. Numerical performance of the current element is investigated in this research.
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Carrera, Erasmo, Stefano Valvano, and Matteo Filippi. "Higher-Order Shell Element for the Static and Free-Vibration Analysis of Sandwich Structures." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86784.

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An advanced shell finite element with a variable kinematic field based on a new zig-zag power function is proposed for the analysis of sandwich shell structures. The kinematic field is written by using an arbitrary number of continuous piecewise polynomial functions. The polynomial expansion order of a generic subdomain is a combination of zig-zag power functions depending on the shell thickness coordinate. As in the classical layer-wise approach, the shell thickness can be divided into a variable number of mathematical subdomains. The expansion order of each subdomain is an input parameter of the analysis. This feature enables the solution to be locally refined over generic regions of the shell thickness by enriching the kinematic field. The advanced finite shell elements with variable kinematics are formulated in the framework of the Carrera Unified Formulation. The finite element arrays are formulated in terms of fundamental nuclei, which are invariants of the theory approximation order and the modelling technique (Equivalent-Single-Layer, Layer-Wise). In this work, the attention is focused on linear static stress analysis and the free-vibration analysis of sandwich shell structures.
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Cho, Maenghyo, and Jinho Oh. "A Finite Element Based on Cubic Zig-zag Plate Theory for the Prediction of Thermo-electric-mechanical Behaviors." In 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-1664.

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Oh, Jinho, Maenghyo Cho, and Jun-Sik Kim. "A Finite Element Analysis Based on Higher-order Zig-zag Shell Theory for Laminated Composites with Multiple Delaminations." In 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-2006.

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