Academic literature on the topic 'Complex-component element'
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Journal articles on the topic "Complex-component element"
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Xie, Li Yang, Wen Xue Qian, and Ning Xiang Wu. "Reliability Model for Complex Mechanical Component Design." Applied Mechanics and Materials 365-366 (August 2013): 28–31. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.28.
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Taking into account the uncertainty in material property and component quality, a complex mechanical component such as a gear should be treated as a series system instead of a component when evaluating its reliability, since there exist many sites of equal likelihood to fail. Besides, conventional system reliability model is not applicable to such a system because of the statistical dependence among the failures of the every element (damage site). The present paper presents a model to estimate complex mechanical component reliability by incorporating order statistic of element strength into load-strength interference analysis, which can deal with multiple failure mechanisms, reflect statistical dependence among element failure events and that among different failure modes.
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Yin, Xiao Wei, Wen Xue Qian, and Li Yang Xie. "Structural Analysis of Complex Aluminum Alloy Structural Component." Applied Mechanics and Materials 602-605 (August 2014): 49–52. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.49.
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Aluminum alloy structures are widely used in engineering practice. The advantage of aluminum alloy is light weight and corrosion resistance. For different application fields, the structures of aluminum alloy components are very different. They are typically lighter for the same strength and provide better heat conduction. As we know that do FEA (finite element analysis) is necessary before and after the alloy structures have been made. In this paper, a detail analysis was done with FEM (finite element method), and the stress distribution of alloy structures was obtained. Also the FEA results show that the maximum stress is much less than the yield stress and the stress concentration of the round is need to notice.
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Xie, Li Yang, and Shao Ze Yan. "A Unified Reliability Modeling Approach for Mechanical System and Complex Component." Advanced Materials Research 308-310 (August 2011): 1416–19. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1416.
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With the scenario of reliability estimation, a geometrically complex mechanical/structural component with multiple damage sites should be treated as a system, since there are many links (damage sites) of similar failure probabilities on any of such a component and the failures of the individual damage sites are not perfectly dependent of each other. Conventional system reliability model is not applicable to such a system because of the statistical dependence among the element (damage site) failures. To estimate the reliability of a mechanical system (or a complex component) in which element (damage site) failure dependence plays an important role, a model capable of reflecting the effect of element failure dependence is necessary. The present paper develops models which can deal with multiple damage sites and multiple failure mechanisms, reflect the dependence among element failure events and that among different failure modes. Such models are applicable to both typical mechanical systems and various components.
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Bergin, M., T. A. Myles, A. Radić, C. J. Hatchwell, S. M. Lambrick, D. J. Ward, S. D. Eder, A. Fahy, M. Barr, and P. C. Dastoor. "Complex optical elements for scanning helium microscopy through 3D printing." Journal of Physics D: Applied Physics 55, no. 9 (November 26, 2021): 095305. http://dx.doi.org/10.1088/1361-6463/ac3a3e.
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Abstract Developing the next generation of scanning helium microscopes requires the fabrication of optical elements with complex internal geometries. We show that resin stereolithography (SLA) 3D printing produces low-cost components with the requisite convoluted structures whilst achieving the required vacuum properties, even without in situ baking. As a case study, a redesigned pinhole plate optical element of an existing scanning helium microscope was fabricated using SLA 3D printing. In comparison to the original machined component, the new optical element minimised the key sources of background signal, in particular multiple scattering and the secondary effusive beam.
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Weis, L., and D. Reinberg. "Accurate positioning of RNA polymerase II on a natural TATA-less promoter is independent of TATA-binding-protein-associated factors and initiator-binding proteins." Molecular and Cellular Biology 17, no. 6 (June 1997): 2973–84. http://dx.doi.org/10.1128/mcb.17.6.2973.
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Two promoter elements, the TATA element and initiator (Inr), are capable of directing specific transcription initiation of protein-encoding genes by RNA polymerase II (RNAPII). Although binding to the TATA element by the TATA-binding protein (TBP) has been shown to be the initial recognition step in transcription complex formation in vitro, the mechanism through which the basal machinery assembles into a functional complex on TATA-less promoters is controversial. Evidence supporting numerous models of Inr-mediated transcription complex formation exists, including the nucleation of a complex by Inr-binding proteins, a component of the TFIID complex, or a specific upstream activator common to many TATA-less promoters, Sp1. Using various techniques, we have undertaken a systematic analysis of the natural TATA-less human DNA polymerase beta (beta-pol) gene promoter. Although the beta-pol promoter contains upstream Sp1 elements and a functional Inr that binds YY1, neither of these factors is essential for Inr-mediated transcription complex formation. A complex containing TBP, TFIIB, TFIIF, and RNAPII (DBPolF complex) is capable of forming on the promoter in an Inr-dependent manner. A single point mutation within the Inr that affects DBPolF complex formation diminishes beta-pol transcriptional activity.
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Kumaresan, Srirangam, Narayan Yoganandan, and Frank A. Pintar. "Posterior Complex Contribution on Compression and Distraction Cervical Spine Behavior: A Finite Element Model." Journal of Musculoskeletal Research 02, no. 03 (September 1998): 257–65. http://dx.doi.org/10.1142/s0218957798000251.
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The relative contributions of the posterior elements on the human cervical spine behavior under axial compression and distraction were determined using the finite element modeling approach. This was accomplished by considering two structures: First, the intervertebral joint structure representing the anterior and posterior columns, including the C4–C6 vertebrae and the neighboring discs with the entire ligamentous complex; and second, the disc joint structure representing only the anterior column (vertebral bodies, discs and longitudinal ligaments). The anterior column sustained a higher share of the load than the posterior column under distraction. However, compression was shared equally among the anterior and the two posterior load bearing columns. The component internal stresses increased with posterior element removal. Consequently, inactivation or compromise in the posterior elements introduces additional internal loads or stresses in the anterior components which may accentuate degenerative changes or injure the cervical column. Thus, posterior complex integrity is critical for the load-carrying capacity of the cervical spine.
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Majidi, Omid, Mohammad Jahazi, and Nicolas Bombardier. "Finite Element Simulation of High-Speed Blow Forming of an Automotive Component." Metals 8, no. 11 (November 3, 2018): 901. http://dx.doi.org/10.3390/met8110901.
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High-speed blow forming (HSBF) is a new technology for producing components with complex geometries made of high strength aluminum alloy sheets. HSBF is considered a hybrid-superplastic forming method, which combines crash forming and gas blow forming. Due to its novelty, optimization of the deformation process parameters is essential. In this study, using the finite element (FE) code ABAQUS, thinning of an aluminum component produced by HSBF under different strain rates was investigated. The impact of element size, variation of friction coefficient, and material constitutive model on thinning predictions were determined and quantified. The performance of the FE simulations was validated through forming of industrial size parts with a complex geometry for the three investigated strain rates. The results indicated that the predictions are sensitive to the element size and the coefficient of friction. Remarkably, compared to a conventional power law model, the variable m-value viscoplastic (VmV) model could precisely predict the thickness variation of the industrial size component.
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Rapaport, Doron, and Walter Neupert. "Biogenesis of Tom40, Core Component of the Tom Complex of Mitochondria." Journal of Cell Biology 146, no. 2 (July 26, 1999): 321–32. http://dx.doi.org/10.1083/jcb.146.2.321.
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Tom40 is an essential component of the preprotein translocase of the mitochondrial outer membrane (TOM complex) in which it constitutes the core element of the protein conducting pore. We have investigated the biogenesis of Tom40. Tom40 is inserted into the outer membrane by the TOM complex. Initially, Tom40 is bound as a monomer at the mitochondrial surface. The import receptor Tom20 is involved in this initial step; it stimulates both binding and efficient insertion of the Tom40 precursor. This step is followed by the formation of a further intermediate at which the Tom40 precursor is partially inserted into the outer membrane. Finally, Tom40 is integrated into preexisting TOM complexes. Efficient import appears to require the Tom40 precursor to be in a partially folded conformation. Neither the NH2 nor the COOH termini are necessary to target Tom40 to the outer membrane. However, the NH2-terminal segment is required for Tom40 to become assembled into the TOM complex. A model for the biogenesis of Tom40 is presented.
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Company, M., and B. Errede. "A Ty1 cell-type-specific regulatory sequence is a recognition element for a constitutive binding factor." Molecular and Cellular Biology 8, no. 12 (December 1988): 5299–309. http://dx.doi.org/10.1128/mcb.8.12.5299.
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Ty transposable-element insertion mutations of Saccharomyces cerevisiae can cause cell-type-dependent activation of adjacent-gene expression. Several cis-acting regulatory regions within Ty1 are responsible for the effect of Ty1 on adjacent-gene expression. One of these is the block II sequence that was defined by its homology to mammalian enhancers and to the yeast a1-alpha 2 control site. Tandem copies of a 57-base-pair region encompassing block II caused an additive increase in expression of the CYC7 reporter gene in the absence of other Ty1 sequences. The activation of gene expression by the multiple repeats was abolished in a/alpha diploid cells. A specific complex between a constitutive factor in whole-cell extracts and the DNA regulatory element was observed. The protein-binding site for the constitutive factor coincided with the block II element. Base-pair substitutions within the binding site abolished the ability of the block II element to function as a component of the Ty1 activator and to form the factor-DNA complex. The correlation between complex formation and reporter gene expression indicates that factor binding to the cis-acting element is essential for this element to function as a component of the Ty1 activator.
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Company, M., and B. Errede. "A Ty1 cell-type-specific regulatory sequence is a recognition element for a constitutive binding factor." Molecular and Cellular Biology 8, no. 12 (December 1988): 5299–309. http://dx.doi.org/10.1128/mcb.8.12.5299-5309.1988.
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Ty transposable-element insertion mutations of Saccharomyces cerevisiae can cause cell-type-dependent activation of adjacent-gene expression. Several cis-acting regulatory regions within Ty1 are responsible for the effect of Ty1 on adjacent-gene expression. One of these is the block II sequence that was defined by its homology to mammalian enhancers and to the yeast a1-alpha 2 control site. Tandem copies of a 57-base-pair region encompassing block II caused an additive increase in expression of the CYC7 reporter gene in the absence of other Ty1 sequences. The activation of gene expression by the multiple repeats was abolished in a/alpha diploid cells. A specific complex between a constitutive factor in whole-cell extracts and the DNA regulatory element was observed. The protein-binding site for the constitutive factor coincided with the block II element. Base-pair substitutions within the binding site abolished the ability of the block II element to function as a component of the Ty1 activator and to form the factor-DNA complex. The correlation between complex formation and reporter gene expression indicates that factor binding to the cis-acting element is essential for this element to function as a component of the Ty1 activator.
Dissertations / Theses on the topic "Complex-component element"
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Bydalek, David Russell. "Manufacture of Complex Geometry Component for Advanced Material Stiffness." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1919.
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The manufacture, laminate design, and modeling of a part with complex geometry are explored. The ultimate goal of the research is to produce a model that accurately predicts part stiffness. This is validated with experimental results of composite parts, which refine material properties for use in a final prototype part model. The secondary goal of this project is to explore manufacturing methods for improved manufacturability of the complex part. The manufacturing portion of the thesis and feedback into material model has incorporated a senior project team to perform research on manufacturing and create composite part to be used for experimental testing. The senior project was designed, led, and managed by the author with support from the committee chair.
Finite element modeling was refined using data from coupon 3-point bend testing to improve estimates on material properties. These properties were fed into a prototype part model which predicted deflection of composite parts with different layups and materials. The results of the model were compared to experimental results from prototype part testing and 3rd party analysis. The results showed that an accurate mid-plane shell element model could be used to accurately predict deflection for 2 of 3 experimental parts. There are recommendations in the thesis to further validate the models and experimental testing.
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Губашова, Валентина Євгенівна. "Обґрунтування раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах." Doctoral thesis, Київ, 2021. https://ela.kpi.ua/handle/123456789/40256.
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Дисертація присвячена обґрунтуванню раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах. В роботі досліджено та встановлено взаємозв’язки технологічних параметрів струменевої цементації з діаметром ґрунтоцементної колони в різних типах ґрунтів. На основі отриманих експоненціальних залежностей діаметра ґрунтоцементного елементу круглого перерізу від енергії високонапірного струменя цементного розчину розроблено методику розрахунку діаметра струменево-цементаційної колони. В процесі дослідження експериментальним шляхом доведено змінення фізико-механічних властивостей ґрунту, що оточує ґрунтоцементний елемент під час його виконання за струменевою технологією. На підставі математичного моделювання визначено закономірності формування в ґрунтових масивах зон з поліпшеними фізико-механічними параметрами в міжколонному просторі в різних типах ґрунтів. Удосконалено методику комп’ютерного моделювання управління напружено-деформованим станом основи будівлі під час її підсилення струменево-цементаційними елементами з урахуванням складних геотехнічних умов.
Books on the topic "Complex-component element"
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Smallwood, Jonathan, Daniel Margulies, Boris C. Bernhardt, and Elizabeth Jefferies. Investigating the Elements of Thought. Edited by Kalina Christoff and Kieran C. R. Fox. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780190464745.013.34.
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Spontaneous thoughts come in a large variety of different forms, varying in their experiential content as well as the functional outcomes with which they are associated. This chapter describes a component process architecture for spontaneous thought in which different types of experience arise through the combinations of different underlying neurocognitive processes. These underlying elements of cognition are not specific to spontaneous thought, since many, if not all, of these neurocognitive processes can be engaged when participants perform an externally directed task. We consider neurocognitive evidence that shows how this component process architecture provides explanatory value for accounts of spontaneous thought since it provides a mechanism that captures both the complex variety of spontaneous experiences that characterize the human condition, as well as the different functional outcomes that these different experiences are associated with.
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Larson, Rhett B. Just Add Water. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190948009.001.0001.
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Scientists have long been searching for a unified field theory—one answer to all of the questions about the physical universe. In Just Add Water: Solving the World’s Problems Using Its Most Precious Resource, I take a similar approach to social policy questions. What if we could find a unified social policy theory—the answer to every question, from how to prevent war to how to promote gender equality? Nearly all of our most serious global challenges are complex, multifaceted “wicked problems.” But perhaps the first step in solving wicked problems as seemingly distinct as racism and disease epidemics is the same: reform our laws, policies, and priorities to achieve global water security. Global water security means reasonable access for all people to water of acceptable quantity and quality with acceptable costs and risks. Just as the essential element to all life is water, so water is the essential element to solving life’s challenges. Virtually every major social challenge—including gender inequality, racial discrimination, terrorism, space exploration, global disease epidemics, mass migrations, and climate change—has a significant and underappreciated water component. Each chapter of this book takes one of these wicked problems, illustrates the role water plays in that problem, and proposes reforms to address the water aspect of that problem, with the aim of achieving global water security. My goal in this book is to convince the reader that the answer, or at least one part of the answer, to our most serious problems is the oft-repeated late-night infomercial exhortation: “Just add water.”
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Boules, Adel N. Fundamentals of Mathematical Analysis. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198868781.001.0001.
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Fundamentals of Mathematical Analysis is a beginning graduate textbook on real and functional analysis, with a substantial component on topology. The three leading chapters furnish background information on the real and complex number fields, a concise introduction to set theory, and a rigorous treatment of vector spaces. Instructors can choose material from this part as their students’ background warrants. Chapter 4 is the spine of the book and is essential for an effective reading of the rest of the book. It is an extensive study of metric spaces, including the core topics of completeness, compactness, and function spaces, with a good number of applications. The remaining chapters consist of an introduction to general topology, a classical treatment of Banach and Hilbert spaces, the elements of operator theory, and a deep account of measure and integration theories. Several courses can be based on the book. The entire book is suitable for a two-semester course on analysis, and material can be chosen to design one-semester courses on topology, real analysis, or functional analysis. The book is designed as an accessible classical introduction to the subject, aims to achieve excellent breadth and depth, and contains an abundance of examples and exercises. The topics are carefully sequenced, the proofs are detailed, and the writing style is clear and concise. The only prerequisites assumed are a thorough understanding of undergraduate real analysis and linear algebra, and a degree of mathematical maturity.
Book chapters on the topic "Complex-component element"
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Kumar, Deepak, S. B. Singh, and Anita Kumari. "Fuzzy System Reliability Using Hesitant Fuzzy Element and Score Function." In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 209–21. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7564-2.ch011.
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The present work introduces a new technique for analyzing the fuzzy reliability of a system stem under hesitant fuzzy environment where the reliability of a component/unit of a system is represented by hesitant fuzzy element (HFE). In this study, the authors evaluate the fuzzy reliability for some complex systems (series configuration, parallel configuration, and bridge configuration) using score function which is very useful in reliability modelling (especially in decision making, risk analysis, and optimization problems). Reliability modelling under hesitant situations plays a key role in the reliability engineering field. The score function used in this study is helpful for a simple comparison between reliabilities of any two components as form of HFEs. Hesitancy is the most common problem in human behaviour, for which hesitant fuzzy set can be considered as a useful tool allowing several possible degrees of membership of an element to a set. Additionally, a numerical example is taken for demonstration of the present technique.
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Werke, Mats, Peter Ottosson, Daniel Semere, and Filmon Yacob. "Prediction of Residual Stresses in Components Using the Contour Method." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220135.
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During machining the accumulated bulk stresses induced by previous shape forming process steps, such as forging, casting or additive manufacturing and subsequent heat treatment, will be released and cause undesirable geometry errors on the final component. By considering the residual stresses during process planning a significant improvement in dimensional accuracy can be achieved. This paper presents experiences for prediction of residual stresses for components with complex geometries using the Contour method. Three sectioning procedures have been tested and a cutting strategi using Electric Discharge Machining with slow feed rate and cutting from two sides with final cut in the middle is proposed. Two Finite Element modelling strategies for 3D-models have been tested and a meshing strategy based on extrusion of the geometry from the cut plane is recommended. Further, a procedure to automate the Finite Element meshing of complex structures using the Alpha Shape algorithm is proposed. The ambition is to integrate this algorithm in procedures for automatization of the entire analysis.
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De Vuyst, Florian, Claire Dupont, and Anne-Virginie Salsac. "Space-Time-Parameter PCA for Data-Driven Modeling with Application to Bioengineering." In Principal Component Analysis [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.103756.
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Principal component analysis is a recognized powerful and practical method in statistics and data science. It can also be used in modeling as a dimensionality reduction tool to achieve low-order models of complex multiphysics or engineering systems. Model-order reduction (MOR) methodologies today are an important topic for engineering design and analysis. Design space exploration or accelerated numerical optimization for example are made easier by the use of reduced-order models. In this chapter, we will talk about the use of higher-order singular value decompositions (HOSVD) applied to spatiotemporal problems that are parameterized by a set of design variables or physical parameters. Here we consider a data-driven reduced order modeling based on a design of computer experiment: from high-dimensional computational results returned by high-fidelity solvers (e.g. finite element ones), the HOSVD allows us to determine spatial, time and parameters principal components. The dynamics of the system can then be retrieved by identifying the low-order discrete dynamical system. As application, we will consider the dynamics of deformable capsules flowing into microchannels. The study of such fluid-structure interaction problems is motivated by the use of microcapsules as innovative drug delivery carriers through blood vessels.
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Corry, Richard. "Taking Apart the World." In Power and Influence, 6–18. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198840718.003.0002.
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This chapter develops a characterization of the kind of reductive explanation that is the topic of the book. In particular, the book is concerned with substantive causal reductions rather than Nagel-style theory reductions. The characterization of reductive explanation that is developed here is based on Marie Kaiser’s account of explanatory reduction in biology, and, like Kaiser’s account, it highlights the importance of the fact that reductive explanations treat component systems as if they were parts in isolation. That is, in a reductive explanation it is assumed that our knowledge of how an element behaves in isolation can be useful in understanding the role that part plays when it is part of a complex system.
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Pala, Mauro. "The garden of the world: Byron and the geography of Italy." In Byron and Italy. Manchester University Press, 2018. http://dx.doi.org/10.7228/manchester/9781526100559.003.0005.
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This chapter concentrates on Byron’s relation to Italy as geography and landscape. It demonstrates that, while reading his poetry confronts us repeatedly with the poet’s digressive, fluid mobilité, studying his relationship to Italy repeatedly confronts us with his capacity for sustained attention to the given. Yet, as this chapter contends, in Canto IV of Childe Harold’s Pilgrimage, attending to the given is not simply a matter of ‘seizing’ the ‘colouring of the scenes which fleet along’ for Byron. By contrast, his depictions of Italian cityscapes and landscapes are ‘complex, heterogeneous and personal negotiations’ not just with ‘real places’ but also ‘their attendant histories’. In Byron’s poetry about Italy, these negotiations not only cast place as an essential component in the consciousness that observes it, but also make that consciousness ‘an essential element of place’.
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Nascimento, Vitor, Glauco Nogueira, Gabriel Monteiro, Waldemar Júnior, Joze Melissa Nunes de Freitas, and Cândido Neto. "Influence of Heavy Metals on the Nitrogen Metabolism in Plants." In Nitrogen in Agriculture - Physiological, Agricultural and Ecological Aspects [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97759.
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As an essential element, Nitrogen is needed in large quantities for being an important component of cellular constituents and for plant metabolism, and its deficiency is one of the most common limitations for plant development. The study of the toxic effects of metal in plants involves a complex system of reactions that can be better determined once having a large attention of the different backgrounds of occurence to determinate how to proceed. The objective of this review is to add scientific knowledge, addressing the main functionalities and characteristics of this relation heavy metals – nitrogen metabolism in plant. Increasing industrialization and urbanization had anthropogenic contribution of heavy metals in biosphere and had largest availability in ecosystems. This toxicity in plants varies with plant species, specific metal, concentration, soil composition, as many heavy metals are considered to be essential for plant growth. Were provided data and reviews regarding the effect of heavy metals on nitrogen metabolism of plants and the responses of plants and the cross-talk of heavy metals and various stressors factors. Is clear to understand the relation between metals amount and the benefit or harm caused on plants, determining then, which mechanism should be activated to protect your physiological system.
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Daly, Blánaid, Paul Batchelor, Elizabeth Treasure, and Richard Watt. "Overview of health care systems." In Essential Dental Public Health. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199679379.003.0024.
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The World Health Organization defines a health care system as: . . . all organizations, people and actions whose primary intent is to promote, restore or maintain health. This includes efforts to influence determinants of health as well as more direct health-improving activities. . . . . . . (WHO 2007) . . . Such a definition covers a myriad of potential elements and factors, of which the dental element is but one. A health care system is not static: it evolves as part of the more general social and welfare arrangements in a society. As a member of a health care profession, all dental care providers need to have an appreciation of the wider aspects of any arrangements of health, its determinants, and care delivery, if only to understand how the pressures on a system may impact on their current and future activities. This chapter provides an overview of health care systems and provides the framework for Chapters 18–23. Health care systems are complex organizations that are in a constant process of change and evolution. Dentistry is one very small component of the wider health care system, which is itself part of the overall social welfare system within society. Dentists, as health professionals, need to understand the basic elements of the health care system within which they are working. The development of health care systems is an ongoing process in which all societies try to meet the health needs of its citizens. There is no society that has yet designed a system that meets the needs of all its citizens. Indeed, historically in many countries it was only the wealthy that were able to access health care in a society. As societies evolved, the pressures to make the health care system accessible to all its members grew. Mays (1991) has highlighted the political importance of health care, showing that many health care systems reforms were designed to prevent political instability and improve the fitness of army recruits. Indeed, the development of the then School Dental Service in the UK was brought about following questions in Parliament about the poor state of soldiers’ teeth in the Boer War.
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Henry Lewes, George. "From The Physical Basis of Mind (1877)." In Literature and Science in the Nineteenth Century. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199554652.003.0055.
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The progress of science involves an ever-increasing Analysis. Investigation is more and more directed towards the separated details of the phenomena previously studied as events: the observed facts are resolved into their component factors, complex wholes into their simpler elements, the organism into organs and...
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Kharchenko, Volodimir, and Oleh Alexeiev. "Ensuring the Guaranteed Level of Flight Safety." In Handbook of Research on Artificial Intelligence Applications in the Aviation and Aerospace Industries, 460–79. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1415-3.ch020.
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This chapter presents a methodology for the determination of the guaranteed level of flights safety. Purpose of the methodology consists in association in the only complex of tasks of assessment, providing verification of safety aviation activities as a complex hierarchical structure with independent critical elements and also hardware, program, network, and ergatic component which are both means, and subject to safety. The realization of ensuring the guaranteed result consists in realization of management processes so as not to allow transition of infrastructure or its systems to potentially dangerous state and to provide blocking (exception) of the corresponding technical object in case of threat of transition or upon transition to a dangerous state and minimization of consequences of such transition.
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Echlin, Kezia, and Andrew Fleming. "The principles of complex abdominal hernia repair." In Oxford Textbook of Plastic and Reconstructive Surgery, edited by Andrew Fleming, 1185–94. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780199682874.003.0103.
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Large, complex abdominal hernias can be repaired with the component separation technique, which creates sliding bipedicled flaps of the rectus abdominis to allow autogenous repair of midline, ventral hernias. This technique involves longitudinal release of the external oblique aponeurosis just lateral to the linea semilunaris, and developing the plane between the external and internal oblique muscles to allow the rectus abdominis muscle and sheath to slide medially. Modifications of the original technique include the addition of mesh reinforcement, release of the deeper elements of the abdominal wall, and sparing of the peri-umbilical perforators to the skin from the deep inferior epigastric artery. Component separation technique is an effective technique to repair large ventral hernias but carries a significant risk of wound complications and a risk of cardiorespiratory compromise.
Conference papers on the topic "Complex-component element"
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"COMPLEX SENTENCES WITH COLLOQUIAL EXPRESSIVE ELEMENT AS A COMPONENT OF LANGUAGE EDUCATION." In SOCIOINT 2021- 8th International Conference on Education and Education of Social Sciences. International Organization Center of Academic Research, 2021. http://dx.doi.org/10.46529/socioint.202120.
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Ivanov, A., A. Kiapour, N. Ebraheim, and V. K. Goel. "Finite Element Modeling and Analysis of Human Pelvis." In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176624.
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The pelvis is a multi-component structure with complex geometry and biomechanical properties. Complex geometry, individual differences between subcomponents and aging create difficulties in analyzing the biomechanical behavior of the pelvis.
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Tabatabaie, Mansour, and Basilio Sumodobila. "Component Mode Synthesis Based SSI Analysis of Complex Structural Systems Using SASSI." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77274.
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Three-dimensional seismic soil-structure interaction (SSI) analysis of nuclear power plants (NPP) is often performed in frequency domain using the computer program SASSI [1]. This enables the analyst to properly a) address the effects of wave radiation in an unbounded soil media, b) incorporate strain-compatible soil shear modulus and damping properties and c) specify input motion in the free field using de-convolution method and/or spatially variable ground motions. For large, complex structural systems with multi-million degrees of freedom (DOF) and large foundation impedance matrices associated with deeply embedded foundations, the conventional sub-structuring analysis approach employed in SASSI often results in a coefficient matrix that is too large to solve with currently available computer resources. To address this problem, the method of component mode synthesis (CMS) is employed in the SSI analysis. This involves partitioning the structure into several interconnected components, calculating the reduced-order model of each component, and then assembling the reduced-order component models into a global model of the total SSI system. This technique has been implemented in MTR/SASSI® [2] utilizing the super-element capability. After the component boundary and foundation motions of the synthesized SSI model are determined, these motions are substituted back into the structural component model to compute the response of the structure. This paper presents the formulation of component mode models, and their implementation into the global SSI model. To check out this procedure, an example of seismic SSI analysis of a simplified NPP model on flexible basemat subject to horizontal and vertical excitations is considered. The total SSI system is first analyzed with SASSI using the conventional approach to compute the baseline (target) solution. The structure is then partitioned from the basemat and analyzed separately using the ANSYS® [3] program to compute the component mode properties that are used to form the boundary super-elements. These super-elements are input into the foundation/soil model and analyzed by MTR/SASSI® to calculate the basemat response. The response of the flexible basemat is checked against the baseline solution. In the final step, the foundation basemat response that includes the SSI effects is imposed onto the structural component to calculate the response of the structure. Comparison of the responses show excellent agreement between the baseline solution and those obtained using CMS method.
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Hufenbach, W., A. Hornig, H. Böhm, A. Langkamp, and A. Keskin. "On the Reduction of the Pre-Processing Effort and the Application of a Contact Meshing Approach for Complex Jet Engine Component Assemblies." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25425.
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A significant proportion of the work effort for finite element (FE) analysis is spent for pre-processing activities, especially for complex structural components and component assemblies. An exclusive use of hexahedron (hex) elements increases the meshing effort substantially compared to tetrahedral elements. An automated method to generate high quality hexahedral meshes for an arbitrary geometry does not exist. In this work, commercially available FE software tools for meshing were investigated with the focus on an advantageous pre-processing effort. The evaluation showed that the software package NX (Siemens PLM Software) offers robust advanced semiautomatic hex meshing capabilities. Furthermore, a Contact Meshing Approach (CMA) was elaborated to reduce the effort of the challenging and time-consuming geometry decomposition significantly. Using the example of an intermediate pressure compressor it can be shown that the pre-processing effort time can be reduced up to 75%. Due to the independent meshes, element transitions in the geometry become redundant. This results in lower total element numbers and higher mesh qualities and subsequently leads to more efficient calculations. Moreover, the increased element quality has positive effects on the result quality.
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Carrera, Erasmo, Ibrahim Kaleel, Manish Nagaraj, and Marco Petrolo. "A Global-Local Strategy for the Elastoplastic Analysis of Complex Metallic Structures via Component-Wise Approach." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86564.
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A global-local approach has been developed for the elasto-plastic analysis of thin-walled metal structures, which interfaces between commercial finite element software and advanced structural theories based on the Carrera Unified Formulation (CUF). The structure is modeled in CUF using the Component-Wise approach where Lagrange polynomials enhance the cross-section kinematics of the beam element. The von Mises constitutive model with isotropic work hardening is used to describe the material nonlinearity. Two types of the global-local approach have been discussed: (1) elastoplasticity is considered in both global and local analyses, and (2) a linear global analysis is followed by a nonlinear local analysis. It is shown that the second version maintains the accuracy of the solution for cases where the plastic zone is localized within the structure. The described approach results in a significant reduction in the computational size of the problem, compared to standard 3D finite element analysis.
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Watanabe, Osamu. "Development of Finite Element Model by Structure Assembly Method: Application to 3 Dimensional Modeling." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25552.
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Making a finite element model for pressure vessel and piping is laborious work and time-consuming. General purpose programs have a special mesh generation tool, which produces finite element model to be used in the analysis of structure, where automatic meshes are generated based on geometrical properties. Obtained mesh shape is generally irregular for complex structures. The present paper shows a development method of finite element model by assembling finite element models for structural component to the whole structure, as is seen in the procedure of actual structures. The finite element component models are prepared for cylindrical shell, spherical shell and nozzle etc., and finite elements for these components are connected to each other to build a whole structure. The present paper presents an application of 3D FE modeling by the proposed method, to show the features and mesh examples.
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Vorster, Willem J. J., and Alex Mann. "A Methodology for Constructing Complex 3D Cracked Body Finite Element Models Efficiently." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84908.
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Design code design by analysis routes often require knowledge of collapse parameters while structural integrity fitness for purpose assessments require detailed knowledge of both collapse and fracture parameters. These parameters can be calculated using detailed Finite Element Analysis (FEA) simulation. However, the process of constructing Finite Element (FE) models of complex components such as branches and branches located on pipework bends is often time consuming when considering aspects of weld design around branches attached to bends or the requirement for specialist knowledge when inserting crack-like features into FE models close to welds or areas with notable curvature such as that found in bends. This paper presents a technique which can be used to construct finite element models quickly so as to shift the effort of the structural integrity expert from modelling to assessment. This paper provides a basic procedure for creating and manipulating FE models to enable inserting cracks in areas of structural discontinuities or in areas of significant curvature. The usefulness of this method is illustrated by considering the results of 3D defect free and cracked FE analyses of pipe bends. It illustrates the use of the method to create defect free branches and can be extended to include crack in these components. The analyses reported here use the commercial FEA software Abaqus. However, this technique can be adapted to any modern FEA software. This methodology would be of particular interest to industries relying on pipework and pressure vessel components and where the failure of such component can have serious safety and commercial implications.
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Mongiardini, Mario, Chiara Silvestri, and Malcolm H. Ray. "Quantitative Validation of a Finite Element Model of a Knee-Thigh-Hip Complex of a 50th Percentile Male." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206801.
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Traditionally the validation process of FE models is carried on by visually comparing two curves, respectively from an experimental test and the numerical simulation. A more rigorous way to quantitative compare two curves in the validation process would be provided by comparison metrics. In this work the component validation of the Finite Element model of a Knee-Thigh-Hip complex was carried on by quantitatively comparing the results from the experimental tests with the corresponding numerical curves. An LSDYNA finite element model of the lower extremities was developed and the condyle, pelvis and femur and components were carefully validated using three comparison metrics. The good match.
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Kompally, Santhosh K., Vinay Ramanath, Karthikeyan Jeevanandan, and Manoj Kunnil. "Recent Advances in Test vs Finite Element Correlations Through Design for Six Sigma Tools." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54346.
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In general, thermal generators have a combination of composites and metals in different assemblies. It is important to note that the material properties and interface stiffnesses change during the assembly process. Added to this change, the complex geometry and assembly procedures result in huge variation in material characterizations. These variabilities triggered a requirement of a unique process for material characterization at both component and assembly levels. This paper covers the details of a 6-stage DFSS methodology, which involves filling the above-stated gaps by performing mechanical tests at component and sub-assembly levels, followed by series of finite element correlations at various stages of design cycle. This paper emphasizes a DFSS-based probabilistic approach, developed with a built-in validation for evaluating finite element variables to match with assembly tests. This paper also discusses the success of this DFSS-based process in bench marking with two test cases.
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Durando, Mario, Domenico Petronio, Giuseppe Rivilli, and Gabriele Virzi` Mariotti. "Finite Element Simulation of Multilayer Metal Cylinder Head Gaskets." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95115.
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The ABAQUS gasket elements are an efficient and flexible tool to study gasket applications. Nevertheless their usage is not limited to gasket analysis, but it provides an effective improvement in structural analysis. The results point out that both the predicted contact pressure and the predicted stress distribution depend on the mesh topology. Several combinations of mesh dimension and topology are investigated. The purpose is the definition of a calculation methodology and the demonstration of the application efficiency. Complex models analysis highlights that the defined methodology represents an effective tool for the design and the optimisation of the head gasket, the cylinder head and the engine block. The methodology is then applied to an actual case. A layout modification to prevent a sealing issue is validated by the FEM analysis. The modification was introduced in the actual component. The qualitative and quantitative evidences provided by the calculation were confirmed by the experimental results obtained by colour films (not running engine with assembly loads at room temperature) and by the test bench (actual working conditions).
Reports on the topic "Complex-component element"
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Milind Deo, Chung-Kan Huang, and Huabing Wang. Parallel, Multigrid Finite Element Simulator for Fractured/Faulted and Other Complex Reservoirs based on Common Component Architecture (CCA). Office of Scientific and Technical Information (OSTI), August 2008. http://dx.doi.org/10.2172/949977.
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Bar-Joseph, Moshe, William O. Dawson, and Munir Mawassi. Role of Defective RNAs in Citrus Tristeza Virus Diseases. United States Department of Agriculture, September 2000. http://dx.doi.org/10.32747/2000.7575279.bard.
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This program focused on citrus tristeza virus (CTV), the largest and one of the most complex RNA-plant-viruses. The economic importance of this virus to the US and Israeli citrus industries, its uniqueness among RNA viruses and the possibility to tame the virus and eventually turn it into a useful tool for the protection and genetic improvement of citrus trees justify these continued efforts. Although the overall goal of this project was to study the role(s) of CTV associated defective (d)-RNAs in CTV-induced diseases, considerable research efforts had to be devoted to the engineering of the helper virus which provides the machinery to allow dRNA replication. Considerable progress was made through three main lines of complementary studies. For the first time, the generation of an engineered CTV genetic system that is capable of infecting citrus plants with in vitro modified virus was achieved. Considering that this RNA virus consists of a 20 kb genome, much larger than any other previously developed similar genetic system, completing this goal was an extremely difficult task that was accomplished by the effective collaboration and complementarity of both partners. Other full-length genomic CTV isolates were sequenced and populations examined, resulting in a new level of understanding of population complexities and dynamics in the US and Israel. In addition, this project has now considerably advanced our understanding and ability to manipulate dRNAs, a new class of genetic elements of closteroviruses, which were first found in the Israeli VT isolate and later shown to be omnipresent in CTV populations. We have characterized additional natural dRNAs and have shown that production of subgenomic mRNAs can be involved in the generation of dRNAs. We have molecularly cloned natural dRNAs and directly inoculated citrus plants with 35S-cDNA constructs and have shown that specific dRNAs are correlated with specific disease symptoms. Systems to examine dRNA replication in protoplasts were developed and the requirements for dRNA replication were defined. Several artificial dRNAs that replicate efficiently with a helper virus were created from infectious full-genomic cDNAs. Elements that allow the specific replication of dRNAs by heterologous helper viruses also were defined. The T36-derived dRNAs were replicated efficiently by a range of different wild CTV isolates and hybrid dRNAs with heterologous termini are efficiently replicated with T36 as helper. In addition we found: 1) All CTV genes except of the p6 gene product from the conserved signature block of the Closteroviridae are obligate for assembly, infectivity, and serial protoplast passage; 2) The p20 protein is a major component of the amorphous inclusion bodies of infected cells; and 3) Novel 5'-Co-terminal RNAs in CTV infected cells were characterized. These results have considerably advanced our basic understanding of the molecular biology of CTV and CTV-dRNAs and form the platform for the future manipulation of this complicated virus. As a result of these developments, the way is now open to turn constructs of this viral plant pathogen into new tools for protecting citrus against severe CTV terms and development of virus-based expression vectors for other citrus improvement needs. In conclusion, this research program has accomplished two main interconnected missions, the collection of basic information on the molecular and biological characteristics of the virus and its associated dRNAs toward development of management strategies against severe diseases caused by the virus and building of novel research tools to improve citrus varieties. Reaching these goals will allow us to advance this project to a new phase of turning the virus from a pathogen to an ally.