This bibliography contains references to papers, conference proceedings, theses and books dealing with finite strip, finite prism and finite layer analysis of structures…
Abstract
This bibliography contains references to papers, conference proceedings, theses and books dealing with finite strip, finite prism and finite layer analysis of structures, materially and/or geometrically linear or non‐linear.
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E. HINTON, N. PETRINIĆ and M. ÖZAKÇA
This paper deals with the buckling analysis of prismatic folded plate structures supported on diaphragms at two opposite edges. The analysis is carried out using variable thickness…
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This paper deals with the buckling analysis of prismatic folded plate structures supported on diaphragms at two opposite edges. The analysis is carried out using variable thickness finite strips based on Mindlin‐Reissner assumptions which allow for transverse shear deformation effects. The theoretical formulation is presented for a family of C(0) strips and the accuracy and relative performance of the strips are examined. Results are presented for a series of problems including plates and stiffened panels. In a companion paper these accurate and inexpensive finite strips are used in the context of structural shape optimization.
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E. HINTON, M. ÖZAKÇA and N.V.R. RAO
This paper deals with structural shape optimization of vibrating prismatic shells and folded plates. The finite strip method is used to determine the natural frequencies and modal…
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This paper deals with structural shape optimization of vibrating prismatic shells and folded plates. The finite strip method is used to determine the natural frequencies and modal shapes based on Mindlin‐Reissner shell theory which allows for transverse shear deformation and rotatory inertia effects. An automated optimization procedure is adopted which integrates finite strip analysis, parametric cubic spline geometry definition, automatic mesh generation, sensitivity analysis and mathematical programming methods. The objective is to maximize the fundamental frequency by changing thickness and shape design variables defining the cross‐section of the structure, with a constraint that the total volume of the structure remains constant. A series of examples is presented to highlight various features of the optimization procedure as well as the accuracy and efficiency of finite strip method.
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R.K. SINGH, T. KANT and A. KAKODKAR
Three‐dimensional transient analysis of a submerged cylindrical shell is presented. Three‐dimensional trilinear eight‐noded isoparametric fluid element with pressure variable as…
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Three‐dimensional transient analysis of a submerged cylindrical shell is presented. Three‐dimensional trilinear eight‐noded isoparametric fluid element with pressure variable as unknown is coupled to a nine‐noded degenerate shell element. Staggered solution scheme is shown to be very effective for this problem. This allows significant flexibility in selecting an explicit or implicit integrator to obtain the solution in an economical way. Three‐dimensional transient analysis of the coupled shell fluid problem demonstrates that inclusion of bending mode is very important for submerged tube design—a factor which has not received attention, since most of the reported results are based on simplified two‐dimensional plane strain analysis.
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The purpose of this paper is to describe the emergence of school-based, secular, mindfulness-based interventions (MBIs) for educators and students that aim to cultivate…
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Purpose
The purpose of this paper is to describe the emergence of school-based, secular, mindfulness-based interventions (MBIs) for educators and students that aim to cultivate mindfulness and its putative benefits for teaching, learning, and well-being.
Design/methodology/approach
The paper has four sections: (a) a description of indicators of increased interest in mindfulness generally and in education; (b) substantive and functional definitions of mindfulness; (c) rationales for the potential value of mindfulness for teaching, learning, and well-being; and (d) a review of extant research on MBIs for teachers and students in schools.
Findings
On the basis of this review, it is concluded that school-based MBIs represent a promising emerging approach to enhancing teaching, learning, and well-being in schools; but that more research, with more rigorous study designs and measures, need to be done to establish the scientific validity of the effects of school-based MBIs for teachers and students alike.
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PETER BETTESS and JACQUELINE A. BETTESS
Survey of period infinite element developments The first infinite elements for periodic wave problems, as stated in Part 1, were developed by Bettess and Zienkiewicz, the earliest…
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Survey of period infinite element developments The first infinite elements for periodic wave problems, as stated in Part 1, were developed by Bettess and Zienkiewicz, the earliest publication being in 1975. These applications were of ‘decay function’ type elements and were used in surface waves on water problems. This was soon followed by an application by Saini et al., to dam‐reservoir interaction, where the waves are pressure waves in the water in the reservoir. In this case both the solid displacements and the fluid pressures are complex valued. In 1980 to 1983 Medina and co‐workers and Chow and Smith successfully used quite different methods to develop infinite elements for elastic waves. Zienkiewicz et al. published the details of the first mapped wave infinite element formulation, which they went on to program, and to use to generate results for surface wave problems. In 1982 Aggarwal et al. used infinite elements in fluid‐structure interaction problems, in this case plates vibrating in an unbounded fluid. In 1983 Corzani used infinite elements for electric wave problems. This period also saw the first infinite element applications in acoustics, by Astley and Eversman, and their development of the ‘wave envelope’ concept. Kagawa applied periodic infinite wave elements to Helmholtz equation in electromagnetic applications. Pos used infinite elements to model wave diffraction by breakwaters and gave comparisons with laboratory photogrammetric measurements of waves. Good agreement was obtained. Huang also used infinite elements for surface wave diffraction problems. Davies and Rahman used infinite elements to model wave guide behaviour. Moriya developed a new type of infinite element for Helmholtz problem. In 1986 Yamabuchi et al. developed another infinite element for unbounded Helmholtz problems. Rajapalakse et al. produced an infinite element for elastodynamics, in which some of the integrations are carried out analytically, and which is said to model correctly both body and Rayleigh waves. Imai et al. gave further applications of infinite elements to wave diffraction, fluid‐structure interaction and wave force calculations for breakwaters, offshore platforms and a floating rectangular caisson. Pantic et al. used infinite elements in wave guide computations. In 1986 Cao et al. applied infinite elements to dynamic interaction of soil and pile. The infinite element is said to be ‘semi‐analytical’. Goransson and Davidsson used a mapped wave infinite element in some three dimensional acoustic problems, in 1987. They incorporated the infinite elements into the ASKA code. A novel application of wave infinite elements to photolithography simulation for semiconductor device fabrication was given by Matsuzawa et al. They obtained ‘reasonably good’ agreement with observed photoresist profiles. Häggblad and Nordgren used infinite elements in a dynamic analysis of non‐linear soil‐structure interaction, with plastic soil elements. In 1989 Lau and Ji published a new type of 3‐D infinite element for wave diffraction problems. They gave good results for problems of waves diffracted by a cylinder and various three dimensional structures.
Rigid multilayer polyimide printed wiring boards exhibit unusually large dimensional change during the lamination process. Therefore, the use of large polyimide multilayer panels…
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Rigid multilayer polyimide printed wiring boards exhibit unusually large dimensional change during the lamination process. Therefore, the use of large polyimide multilayer panels for high density circuitry is often limited. This study examined ten probable causes for dimensional instability and how each affected the shrinkage/growth in the laminated panel. The report shows that a combination of methods and materials can reduce the resultant dimensional change experienced during lamination from 0·001 inch/inch to less than 0·0002 inch/inch in planar directions.
The vacuum press when used for lamination of flex and rigid‐flex printed wiring boards produces boards which exhibit better dimensional stability and better fill characteristics…
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The vacuum press when used for lamination of flex and rigid‐flex printed wiring boards produces boards which exhibit better dimensional stability and better fill characteristics at lower pressures than when a conventional hydraulic platen press is used. This paper presents how lamination with a vacuum press differs from lamination with a hydraulic press and what results can be achieved with this new type of equipment technology.
ANY system based on a standard unit capable of being divided by tenths or hundredths for any lesser value enormously simplifies calculations and through a saving of time and…
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ANY system based on a standard unit capable of being divided by tenths or hundredths for any lesser value enormously simplifies calculations and through a saving of time and labour reduces costs. It is therefore a matter for satisfaction that this country, laggard as usual, will within a matter of days fall into step with other industrial nations. Indeed, as the official guide to the decimal system points out, almost every country in the world uses it. So Britain at last joins the great majority.
The aim of the model is to represent the main features of soft or brittle rock strata, using a small number of physically‐meaningful material parameters. The yield surface is…
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The aim of the model is to represent the main features of soft or brittle rock strata, using a small number of physically‐meaningful material parameters. The yield surface is based on either the Mohr—Coulomb or Hoek—Brown criterion, and a simple small‐dilation flow rule allows the implicit algorithm of elasto‐viscoplasticity to be used. Elastic—brittle plastic behaviour is modelled, resulting in stress discontinuities across the interface between intact and failed rock. The effects of lamination and jointing are taken into account. Results are presented for a tunnelling problem with axial symmetry.