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Добірка наукової літератури з теми "Nite element method"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Nite element method"

1

Öchsner, Andreas. "On some Conceptual Considerations for the Finite Element Simulation of the Oxygen Out-Diffusion in Ag-MgO Composites." Defect and Diffusion Forum 283-286 (March 2009): 1–5. http://dx.doi.org/10.4028/www.scientific.net/ddf.283-286.1.

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The presence of atomic oxygen at internal metal-ceramic oxide interfaces signi¯- cantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material. The application of numerical tools such as the ¯nite element method requires some conceptional considerations if results from different finite element meshes of methods should be comparable. This paper summarises some of these thoughts in order to provide the right basis for comparative investigations.
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2

PROKOPOVICH, Anatoly A., and Yana A. BUZOVSKAYA. "MODELING OF STRESS-DEFORMED STATE OF BENDED REINFORCED CONCRETE ELEMENTS IN ZONES OF CLEAN AND TRANSVERSE BEND." Urban construction and architecture 11, no. 1 (December 15, 2021): 26–33. http://dx.doi.org/10.17673/vestnik.2021.01.3.

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The article deals with the analysis of the stress-strain state (SSS) of a bent reinforced concrete element in zones of pure and transverse bending. It is assumed that a bent element in the process of loading (after the formation of normal and oblique cracks) is divided into blocks, united by uncracked concrete and reinforcement that has adhesion to concrete. SSS was formed using the results of experimental studies of special prototypes in the PC “Lira-SAPR”. A fi nite element model of a prototype has been developed in the form of a reinforced concrete rectangular beam loaded with two identical concentrated forces in the span. By the method of successive approximations, the process of formation and formation of a system of cracks is realized, with which the beam is divided into blocks during loading. The results of calculating the fi nite element model and their comparison with experimental data are presented.
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3

Dyachenko, Denis Yu, and Svetlana V. Dyachenko. "Finite element method in computer simulation for improved patient care in dentistry: A systematic review." Kuban Scientific Medical Bulletin 28, no. 5 (October 30, 2021): 98–116. http://dx.doi.org/10.25207/1608-6228-2021-28-5-98-116.

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Background. The fi nite element method is gaining acknowledgment in Russia and other developed countries in a range of areas, including medicine. In stomatology, the method is applicable in research and implication of novel treatment and relevant material design.Objective. The review highlights usage of the fi nite element method in computer simulation to improve quality of patient dental care.Methods. The review analyses the state-of-the-art in current scientific literature. Records were mined in the PubMed and e-Library databases at a depth of 10 years, with selective inclusion of earlier articles. The query keywords were: finite element method [метод конечных элементов], computer simulation [компьютерная симуляция], quality of life improvement [повышение качества жизни], oral diseases [заболевания полости рта], dental treatment [стоматологическое лечение].Results. The review systematically surveys 56 scientific papers in the focus area for current state-of-the-art in the finite element analysis-empowered simulation in dentistry. The method’s rising employment is conditioned by its flexibility, 3D-object modelling simplicity and the rapid acquisition of reliable high-quality output. Its undoubted paramount advantage in dentistry is an explicit software visualisation of reliable results through co-modelling of multiple oral parameters.Conclusion. The growing acquaintance, mastering and use of this technique among researchers around the globe will give impetus to novel diagnosis and treatment, as well as relevant management algorithms in particular patient categories to enable personalisation of even mass dental check-up. This will reduce the number of visits, peri- and posttreatment error and complication rates for the improved patient’s quality of life and social rehabilitation.
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4

Das, S., M. F. Abbod, Q. Zhu, Eric J. Palmiere, I. C. Howard, D. A. Linkens, and C. M. Sellars. "A Hybrid Modelling Approach Applied to the Evolution of Microstructure during Plane Strain Deformation." Materials Science Forum 715-716 (April 2012): 416–26. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.416.

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This paper presents a modelling strategy that combines neuro-fuzzy methods to dene the material model with cellular automata representations of the microstructure, all embedded within a nite element solver that can deal with the large deformations of metal processing technology. We use the acronymnf-CAFE as a label for the method. The need for such an approach arises from the twin demands of computational speed for quick solutions for ecient material characterisation by incorporating metallurgical knowledge for material design models and subsequent process control. In this strategy, the cellular automata hold the microstructural features in terms of sub-grain size and dislocation density which are modelled by a neuro-fuzzy system that predicts the ow stress. The proposed methodology is validated on a two dimensional (2D) plane strain compression nite element simulation with Al1%Mg alloy. Results from the simulations show the potential of the model for incorporating the eects of the underlying microstructure on the evolving ow stress elds. In doing this, the paper highlights the importance of understanding the local transition rules that aect the global behaviour during deformation.
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5

Manchorova-Veleva, Neshka А. "Three-dimensional analysis of cavity wall deformation after composite restoration of masticatory teeth." Folia Medica 53, no. 4 (December 1, 2011): 53–59. http://dx.doi.org/10.2478/v10153-011-0068-8.

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ABSTRACT AIM: The aim of the present work was to study the size of cavity wall deformation in eight class I and II defects after composite restoration. MATERIALS AND METHODS: 1. Creating a geometric model - data on the size of the left maxillary second premolar were obtained from a routine craniofacial scanning of a 20-yearold patient with a 2,5 Dental CT scanner (General Electric), with high resolution and 0.625mm-thin slices. The contour of each of the 33 cross-sections of tooth 25 was delineated using graphics software (CorelDraw 7.0) and transferred to a specialized product for engineering design (SolidWorks Offi ce Premium 2010, SolidWorks Corp. USA). The pulp cavity and periodontal ligament were created in the same manner and were integrated in the premolar body; 2. Generation of a fi nite element method - the geometric model was exported to specialized software for analysis by the fi nite element method - COSMOSWorks 2010, which automatically builds a 3D fi nite elements mesh. Based on the generated model, eight additional models of class I and II cavities with different geometries, adhesive layer and nanofi lled composite restorations were constructed. The polymerization shrinkage was modelled by thermal deformation, with a negative temperature difference (cooling), corresponding to the actual volume shrinkage of the composite materials by 2.1%. RESULTS: In models A and B, the maximum cavity wall displacement was small - 0.014 mm and 0.015 mm, respectively. In models A1, B1, C1 and C, the displacement was at the expense of large deformation of the dental tissues. The maximum cavity wall displacements were 0.020 mm, 0.026 mm, 0.020 mm, 0.035 mm, respectively. The least cavity wall displacement was in models A2 and B2 with 0.008 mm and 0.017 mm, respectively. CONCLUSIONS: The least displacement resulting from cavity wall deformation is found in patient-friendly class I and II preparations. Preservation of the dental tissues reduces the risk of mechanical pressure on the dentinal lymph and the likelihood of post-operative sensitivity.
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6

Zhou, Jing, Bao Yu Wang, Lei Fu, and Qing Lei Meng. "A Method to Optimize Aluminum Alloy Door Impact Beam Stamping Process Using NSGA-II." Materials Science Forum 773-774 (November 2013): 89–94. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.89.

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The process parameters of aluminium alloy hot stamping produce an importantly effect on production forming quality. In the case of a door impact beam inside the car doors, the fi-nite-element model of aluminium alloy hot stamping is set up. Based on the model, the forming quality is investigated under usual process condition. Using the Latin hypercube method, we sampled the data points from design space of process parameters. Data points are imported into finite-element model to calculate the forming quality indices. According to their responding values, the quadratic response surfaces between process parameter inputs and forming quality indices are initialized. By optimized the response of the process parameters exercising multi-objective genetic algorithm—NSGA-II (non-dominated sorting genetic algorithm), the Pareto combinations of blank hold force and stamping velocity are obtained. Finally, by comparison with the results of stamping trial and numerical simula-tion, it is concluded that the finite-element model can be used to predict forming defects and is consistent with actual condition. Thus the optimization method is feasible.
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7

Djaghout, Manal, Aberrazak Chaoui, and Khaled Zennir. "Full discretization to an hyperbolic equation with nonlocal coefficient." Boletim da Sociedade Paranaense de Matemática 40 (January 23, 2022): 1–14. http://dx.doi.org/10.5269/bspm.46032.

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We present full discretization of the telegraph equation with nonlocal coeffecient using Rothe-nite element method. For solving the equation numerically we use the Newton Raphson method, but the nonlocal term causes diffeculties because the Jacobien matrix is full. To remedy these diffeculties we apply the technique used by Sudhakar [4]. The optimal a priori error estimates for both semi discrete and fully discrete schemes are derived in V and H1 and a numerical experiment is described to support our theoretical result.
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8

Kovalev, Alexei A., and Dmitry S. Panych. "Modeling of thermal processes in a contact wire by the fi nite element method using Comsol Multiphysics 5.2 software package." Innotrans, no. 3 (2017): 49–52. http://dx.doi.org/10.20291/2311-164x-2017-3-49-52.

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9

Izudin Kapetanović, Nermin Sarajlić, Majda Tešanović, and Mensur Kasumović. "NUMERICAL SOLUTION FOR THE DISTRIBUTION OF THE ELECTROMAGNETIC AND THERMAL FIELDS OF AN AIR-CORE TRANSFORMER." Journal of Energy - Energija 57, no. 4 (October 11, 2022): 424–39. http://dx.doi.org/10.37798/2008574331.

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The article presents a numerical solution for the distribution of the electromagnetic and thermal fi elds of an air-core transformer using the fi nite element method. The distribution of the magnetic fi eld is determined for the dynamic steady state and magnetic nonlinear core characteristics. The model presented facilitates the establishment of criteria for optimizing transformer operation under various load conditions, environments as well as in the case of failures. Thus, the transformer can operate at maximum capacity while, at the same time, the probability of faults due to overheating is reduced to a minimum.
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10

Gong, Dian Xuan, and Feng Gong Lang. "On the Dimension of Bivariate C1 Cubic Spline Space with Homogeneous Boundary Conditions over a CT Triangulation." Applied Mechanics and Materials 50-51 (February 2011): 488–92. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.488.

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A bivariate spline is a piecewise polynomial with some smoothness de ned on a parti- tion. In this paper, we mainly study the dimensions of bivariate C1 cubic spline spaces S1;0 3 (CT ) and S1;1 3 (CT ) with homogeneous boundary conditions over CT by using interpolating technique, where CT stands for a CT triangulation. The dimensions are related with the numbers of the inter vertices and the singular boundary vertices. The results of this paper can be applied in many elds such as the nite element method for partial di erential equation, computer aided design, numerical approximation, and so on.
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Більше джерел

Дисертації з теми "Nite element method"

1

Usner, Brian C. "Generalized hybrid methods for modeling complex electromagnetic structures." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1135004394.

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2

Orgéas, Laurent. "Étude expérimentale et numérique du comportement thermomécanique d'un alliage à mémoire de forme industriel NiTi." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10256.

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Le present document est une contribution a l'etude experimentale, theorique et numerique du comportement thermomecanique d'un alliage a memoire de forme industriel niti. Le travail est constitue principalement de trois parties : validation des hypotheses de base utilisees dans les lois de comportement, realisation d'essais mecaniques pour caracteriser les comportements ferroelastique et superelastique du materiau, et modelisation tridimensionnelle appliquee au calcul de structures. L'objectif d'un tel travail est de fournir a l'ingenieur de bureau d'etudes un outil numerique capable de dimensionner des pieces de structures en alliages a memoire de forme. Les lois de comportement sont etablies a partir d'hypotheses physiques, en particulier concernant l'origine de l'hysteresis tant thermique que mecanique. Celles-ci sont validees a partir d'experiences realisees en cisaillement simple en ferroelasticite et en superelasticite, sur des polycristaux de niti, mais aussi sur des monocristaux de cuznal. De plus, les predictions quantitatives du modele sont alors satisfaisantes. Une campagne d'essais homogenes de caracterisation (traction, compression et cisaillement) est effectuee a differentes temperatures. Ces essais ont ete realises sur des toles ayant ete soumises au meme traitement thermomecanique prealable. Ils mettent en evidence la complexite des phenomenes physiques a modeliser : comportement fortement non lineaire a hysteresis, dependance des proprietes caracteristiques avec la temperature, dissymetrie de comportement entre traction et compression. Le schema constitutif sous sa forme tridimensionnelle est alors identifie a ces essais, et modelise correctement la majorite des comportements observes. Ce schema est implante dans un code de calculs elements finis ecrits en grandes transformations, qui utilise la notion de coordonnees materielles entrainees. Finalement, la demarche de modelisation est validee : les predictions des simulations numeriques sont comparees avec des experiences mettant en evidence des sollicitations heterogenes, soit de localisation observee lors de traction de tole, soit de flexion de poutre.
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3

Gadot, Benjamin. "Mécanique des milieux fibreux auto-enchevêtrés : application à un alliage à mémoire de forme de type Nickel-Titane." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENI010/document.

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L’objectif de ce travail est d’élaborer et de caractériser pour des applications biomédicalesun matériau auto-enchevêtré à base d’une seule fibre d’alliage à mémoire deforme de type Nickel-Titane. Nous avons optimisé un procédé de fabrication consistantà enchevêtrer et figer un ressort par des traitements thermiques. Les échantillonsont été caractérisés en compression et traction, avec suivi par caméra optique ettomographie in-situ. Les structures obtenues sont homogènes, isotropes, superélastiquesà température ambiante jusqu’à des déformations d’au moins 30%, et peuventdevenir ferroélastiques avec un effet mémoire d’au moins 16% par un traitement thermiqueadditionnel. Leur comportement en compression est consolidant puis dilatantet en traction, légèrement auxétique. Une comparaison avec des milieux similairesconstitués de fils ductiles et viscoélastiques, ainsi qu’avec des simulations par élémentsdiscrets sur des milieux élastiques sans frottement, montre que les propriétésmécaniques des structures auto-enchevêtrées sont contrôlées par leur architecturesingulière, à mi-chemin entre milieux continus et discrets
The aim of this work is to process and characterize for biomedical applications,self-entangled structures made of a single NiTi shape memory fiber. We have optimizeda processing route consisting in entangling and shape-setting a spring bythermomechanical treatments. The samples were characterized in compression andtension, using optical and x-ray tomographic observations. The structures thus obtainedare homogeneous, isotropic, superelastic at room temperature up to strains ofat least 30%, and can become ferroelastic with a shape memory effect up to at least16% strain by an additional heat treatment. The mechanical behavior in compressionis first consolidating and then dilating, while in tension, the samples are slightlyauxetic. A comparison with similar media made of ductile and viscoelastic fibers,as well as with discrete element simulations on friction-free elastic fibers, show thatthe mechanical properties of these self-entangled structures are controlled by theirunique architecture, in-between continuous and discrete media
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4

Zhou, Xiaohan. "Elements of continuity between mathematical writings from the Song-Yuan (13th - 14th Century) Dynasties and the Ming Dynasty (15th Century) : Comparing Yang Hui's Mathematical Methods (1261 C.E.) and Wu Jing’s Great Compendium (1450 C.E.)." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC333.

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Le discours qui insiste sur une « rupture » entre les mathématiques de la période Song-Yuan et celles de la période Ming est très répandu dans les écrits historiques consacrés aux mathématiques en Chine. Cette thèse analyse le processus et les raisons de l’apparition de ce genre de discours, et montre que la représentation en forme de « rupture » ne se présente que lorsque les observateurs examinent les mathématiques depuis certaines perspectives. Cette thèse est consacrée à la recherche d'éléments de continuité entre les mathématiques des Ming et celles des Song et des Yuan. Les Neuf chapitres sur les procédures mathématiques (ci-après, Les Neuf chapitres) ont représenté un ouvrage très important au cours de l’ensemble de ces périodes. L'achèvement des Neuf chapitres, tel que transmis par la tradition écrite, date de quelque part entre le premier siècle avant notre ère et le premier siècle après notre ère. Les Méthodes mathématiques (1261) de Yang Hui et le Grand Compendium (1450) de Wu Jing sont de précieux écrits mathématiques rédigés au cours des deux périodes examinées. Ils sont basés sur Les Neuf chapitres et leurs commentaires antérieurs. Pour ce qui concerne la question de la continuité entre textes mathématiques, ma thèse propose des études de cas comparant ces deux livres, qui montrent que Wu Jing a systématiquement repris des parties du texte des Méthodes mathématiques pour compiler le Grand Compendium. La manière selon laquelle Wu Jing a extrait des passages dans chaque chapitre de Yang Hui pourrait être utilisée pour récupérer en partie le texte de Yang Hui. En ce qui concerne la continuité des idées mathématiques, tout d’abord, l’organisation et l’ordre des problèmes du texte ancien tel que revus par Yang Hui sont des résultats essentiels du traitement des Neuf chapitres par l’érudit des Song. Wu Jing les a repris lorsqu'il a organisé les problèmes du Grand Compendium. Par ailleurs, Yang Hui a beaucoup insisté sur les « méthodes mathématiques ». Il en a ajouté de nouvelles et en a modifié d’autres qui provenaient des Neuf chapitres. Wu Jing a compris ces modifications et les a adoptées dans son Grand Compendium. En même temps, certains concepts et termes mathématiques, ainsi que l’utilisation de diagrammes, relatifs aux méthodes mathématiques qu’avait introduits l’érudit des Song, ont également été intégrés dans le Grand Compendium. Toutes ces découvertes montrent que Les Neuf chapitres qui ont circulé sous la dynastie des Ming avaient largement intégrés les réflexions et le travail de l’érudit des Song
The discourse of “break” between the mathematics of the Song-Yuan period and that of the Ming period is quite widespread in the historical writings dealing with mathematics in China. This thesis analyzes the process and the reasons of the shaping of this kind of discourse and suggests that discourses that insisted on a “break” only appeared when observers looked at mathematics from certain viewpoints. This thesis is devoted to finding elements of continuity between the mathematics of the Ming dynasty and that of the Song-Yuan time period. The Nine Chapters on Mathematical Procedures (thereafter, The Nine Chapters) represented a very important book during these two periods. The completion date of The Nine Chapters in the form that was handed down is placed somewhere between the first century B.C.E. and the first century C.E. Yang Hui’s Mathematical Methods (1261 C.E.) and Wu Jing’s Great Compendium (1450 C.E.) are extant and precious mathematical writings from the two periods considered, which were based precisely on The Nine Chapters and its ancient commentaries. With respect to the continuity of mathematical text between these two books, my dissertation offers case studies that show that Wu Jing systematically took parts of the text of Mathematical Methods to compile Great Compendium. The rule by which text was extracted from each chapter could be used to partly recover Yang Hui’s text. With respect to the continuity of mathematical ideas, firstly, the arrangement and the order of problems are essential results of the Song scholar’s treatment of The Nine Chapters. They were taken up by Wu Jing when he arranged problems in Great Compendium. Secondly, Yang Hui laid a great emphasis on “mathematical methods”. He added some new mathematical methods and also changed some methods in The Nine Chapters. Wu Jing understood these changes and adopted them in his Great Compendium. Meanwhile, some mathematical concepts and terms, and the use of diagrams, relating to these mathematical methods that the Song scholar introduced, were also absorbed into Great Compendium. All these findings prove that The Nine Chapters that circulated in the Ming dynasty had been largely permeated by the thoughts of the Song scholar
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5

Bhat, Srivatsa K. "On the isospectrals of Rayleigh and Timoshenko beams and a new version of Bresse-Timoshenko equations." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5399.

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Книги з теми "Nite element method"

1

P, Zolésio J., ed. Boundary control and boundary variations: Proceedings of the IFIP WG 7.2 Conference, Nice, France, June 10-13, 1987 [i.e. 1986]. Berlin: Springer-Verlag, 1988.

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2

H, Greene William, and Langley Research Center, eds. Experiences with a preliminary NICE/SPAR structural analysis system. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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3

Venkatesh, Prasad, Darbhamulla Siva Prasad, and United States. National Aeronautics and Space Administration., eds. Two-dimensional finite element analysis of rectangular panel with hole using NICE/SPAR: Progress report for the period ended December 31, 1986. Norfolk, Va: Old Dominion University Research Foundation, 1987.

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4

Venkatesh, Prasad, Darbhamulla Siva Prasad, and United States. National Aeronautics and Space Administration, eds. Two-dimensional finite element analysis of rectangular panel with hole using NICE/SPAR: Progress report for the period ended December 31, 1986. Norfolk, Va: Old Dominion University Research Foundation, 1987.

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5

Venkatesh, Prasad, Darbhamulla Siva Prasad, and United States. National Aeronautics and Space Administration, eds. Two-dimensional finite element analysis of rectangular panel with hole using NICE/SPAR: Progress report for the period ended December 31, 1986. Norfolk, Va: Old Dominion University Research Foundation, 1987.

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6

Venkatesh, Prasad, Darbhamulla Siva Prasad, and United States. National Aeronautics and Space Administration., eds. Two-dimensional finite element analysis of rectangular panel with hole using NICE/SPAR: Progress report for the period ended December 31, 1986. Norfolk, Va: Old Dominion University Research Foundation, 1987.

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7

Chaudouet-Miranda, A., and C. A. Brebbia. Boundary Elements in Mechanical and Electrical Engineering: European Boundary Element Method Symposium, 15-17 May 1990, Nice, Franc. Springer, 1990.

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8

Simon, Gleeson, and Guynn Randall. Part II The US Resolution Regime, 5 Fundamentals of Resolution Authority. Oxford University Press, 2016. http://dx.doi.org/10.1093/law/9780199698011.003.0005.

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Анотація:
This chapter looks at the history and fundamental elements of resolution authority as it has been developed and used in the United States. The goal of resolution authority in the United States has been to deal with failed banks and other financial institutions in a manner that stems runs, avoids contagion and preserves critical operations, the same goal as deposit guarantee schemes. First introduced in the United States in 1933 as part of the deposit insurance programme for banks, resolution authority was originally little more than the method by which the Federal Deposit Insurance Corporation honoured its obligations to insured depositors before evolving to its current state. Resolution authority, as conceived in the United States, has two principal components—the core resolution powers and the claims process. The core resolution powers consist of the authority to quickly separate the assets and viable parts of a failed bank's business (the good bank) from its capital structure liabilities (the bad bank), so that its critical operations are preserved and runs and contagion are avoided. It is virtually always completed in the United States over a weekend commonly known as resolution weekend. The claims process involves determining the validity and amount of the claims of individual holders of capital structure liabilities in accordance with ordinary principles of due process and distributing the residual value of the good bank to such holders in satisfaction of their claims. The claims process typically takes at least six to nine months to be completed in order to comply with ordinary principles of due process for potential claimants.
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9

Gajewski, Zbigniew. Prognozowanie wystąpień faz fenologicznych pierwiosnki omączonej Primula farinosa L. (Primulaceae) – krytycznie zagrożonego gatunku - w odniesieniu do fenologii innych składników lokalnej flory i panujących warunków termicznych. Publishing House of the University of Agriculture in Krakow, 2018. http://dx.doi.org/10.15576/978-83-66602-32-8.

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Анотація:
In Poland, the bird’s-eye primrose (P. farinosa) is a rare and critically endangered species. Currently, it occurs only in one location in the area of the Jaworki village in Radziejowa Range (of Beskid Sądecki mountains). This is the last of the nine previously existing locations, and the only one occurring in the mountains. To maintain the species, as well as the moutain fen on which it grows, a multiannual conservation program has been implemented, including, among other measures, conducting environmental monitoring and performing active protection procedures. In 2012–2014, studies were carried out, aiming to identify the phenology of P. farinosa in its natural location amid other elements of local flora, and to elaborate reasonably accurate forecast methods of its phenological phases, in relation to the performed procedures. One of the methods was based on comparing subsequent phenological phases of P. farinosa, mainly the dates of flowering and opening of the fruits, with the dates of flowering of other species that commonly occur in the vicinity. On the basis of temperature data from the IMGW meteorological station in Krościenko nad Dunajcem, available via the Internet, an attempt to forecast the phenophases of P. farinosa has also been made, based on the developed network of nearby meteorological stations. A degree-days method was used. Prior to that, a value of base temperature (Tb) characteristic for P. farinosa was assessed, as necessary for further calculations, and the values of SAT (Sum of Active Temperatures, using the formula for GDD values) have been determined for the dates of occurrence of subsequent phenological phases of P. farinosa. These parameters were calculated using temperature data recorded at the location. During the observations, it was established that the dates of flowering for P. farinosa were dependent on the air temperatures during spring. The flowering period of the population in Jaworki took place in the months of April through to June, and it did not exceed 7.5 weeks. P. farinosa is one of the earliest blooming species in that location. Other species, also flourishing during the blooming thereof, included Eriophorum angustifolium, Caltha laeta, Chrysosplenium alternifolium, Oxalis acetosella, and Primula elatior. The full bloom of P. farinosa lasted for about 2 weeks, and it took place between the end of April and the end of the second decade of May. During its full bloom, in that same location, Cardamine pratensis, Geum rivale, and Valeriana simplicifolia also flourished. Trees and bushes from the rose (Rosaceae) family proved to be especially useful in the forecasting of P. farinosa flowering period. During the flowering of P. farinosa, in lower locations, species from the Prunus and Cerasus genera subsequently flourished, followed by the Malus, Sorbus, and Crataegus genera. The opening of P. farinosa fruits was observed in the last days of June or at the beginning of July. The date of commencement and duration of this phase is probably subject also to the degree of air humidity. Although in this period numerous species flourish such as Ononis arvensis, Valeriana sambucifolia, Cichorium intybus, Melilotus alba, Achillea millefolium, Daucus carota, Geranium pratense, and Agrimonia eupatoria, the forecasts based on those are not accurate. When forecasting this phase, as well as the majority of other phases, the SAT value calculation based on the degree-days method works well. The Tb base temperature (threshold temperature) for P. farinosa from Jaworki, determined for its calculation, is 0.75°C. However, for the calculation purposes, the rounded value of Tb = 1.0°C can also be used. When adopting the value of Tb = 0.75°C for calculations, the full bloom of P. farinosa falls within the period in which the SAT values remain between 310°C and 469°C, the optimum (culmination) of the full bloom occurs at about 408°C, and the beginning of capsules opening and release of P. farinosa seeds occur when the SAT values reach 1049°C. For Tb = 1.0°C the full bloom falls within the period in which the SAT values are between 295°C and 449°C, the optimum of full bloom occurs at 390°C, and the capsules begin opening at 1018°C. When using this method, the differences between the forecasted and the observed dates of P. farinose blooming were between –4 and +3 days, and the beginning of opening of its fruits, between –1 and 0 days. In case of no temperature data available from the given location, the forecasting can be also performed based on the data from the IMGW meteorological station in Krościenko. The accuracy of calculations is increased through the implementation of appropriate temperature data adjustments, resulting from the difference of location and height. The temperatures in Jaworki are 2°C lower compared to the station in Krościenko. The dates determined in this way are less accurate than those determined directly at the location, and they differ from the actual dates: in case of full bloom, the difference is in the range of –6 to +2 days, and in case of the beginning of capsules’ opening, it is –2 to –1 days. Probably, it is also possible to implement forecasting based on the data from new automated meteorological stations situated closer to the location, but this can be done only after the adjustment appropriate for every station has been determined and implemented. As demonstrated, the elaborated forecasting methods of P. farinosa phenological phases at the location in Jaworki (Beskid Sądecki) are sufficiently accurate and they may be used in the future as a tool supporting the implementation of measures related to active protection of the species.
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Частини книг з теми "Nite element method"

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Felippa, C. A., and G. M. Stanley. "NICE: A Utility Architecture for Computational Mechanics." In Finite Element Methods for Nonlinear Problems, 447–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82704-4_24.

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Huang, H. C., and E. Hinton. "Elastic-Plastic and Geometrically Nonlinear Analysis of Plates and Shells Using a New Nine Node Element." In Finite Element Methods for Nonlinear Problems, 283–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82704-4_16.

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Shamsgovara, Arman. "Enumerating, Cataloguing and Classifying All Quantales on up to Nine Elements." In Relational and Algebraic Methods in Computer Science, 224–40. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28083-2_14.

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Sulaiman, Jumat, Mohamed Othman, and Mohammad Khatim Hasan. "Nine Point-EDGSOR Iterative Method for the Finite Element Solution of 2D Poisson Equations." In Computational Science and Its Applications – ICCSA 2009, 764–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02454-2_59.

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Cărăuşan, Mihaela V. "The Integration of Experiential Learning in Higher Education Institutions—An Assessment of the Romanian Universities." In European Higher Education Area: Challenges for a New Decade, 283–97. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-56316-5_19.

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Анотація:
Abstract This paper presents how Romanian educational strategies are aligned with the policy statements of international organisations for future generations. The research hypothesis is that Romanian higher education institutions (HEI) are not ready to fulfil the needs of future generations. The paper reviews the educational competences of fourteen faculties of public administration and management from nine universities (state and private). The analysis is based on Kolb’s experiential learning cycle elements, and we identified whether educational competences referred directly to them or not. Our findings concentrate on the lack of recognition of experiential learning methods and the gap between the labour market requirements and the educational competences acquired in Romanian HEI. The methodology used to respond to the research questions mixes qualitative (strategies and literature review, structured interviews) and quantitative approaches (assessment of the curricula and information presented in the admission process by Faculties of Public Administration and Management).
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Tuomi, Aarni, Iis Tussyadiah, and Mark Ashton. "Covid-19 and Instagram: Digital Service Innovation in Top Restaurants." In Information and Communication Technologies in Tourism 2021, 464–75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65785-7_45.

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AbstractGovernments across the world have imposed strict rules on social distancing to curb the spread of Covid-19. In particular, restaurants have been impacted by government-mandated lockdowns. This study adopts a mixed methods approach to explore how Finnish high-profile restaurants used Instagram as a means for service innovation and diffusion during nine weeks of government-mandated lockdown. Comparatively analysing 1,119 Instagram posts across two time-stamps (2019 and 2020) and across 45 restaurants, as well as conducting five semi-structured interviews with restaurant managers, it is found that while the overall number of Instagram posts and likes on posts stayed relatively similar to the year prior, the number of comments increased significantly, suggesting a move towards a more didactic and dyadic form of Instagram communication. In addition, four digital service innovation strategies are identified: launching new service offerings and introducing new elements to existing service offerings, fostering social relationship with customers, exploring novel streams of revenue, and reinvigorating the brand’s image. Implications to service innovation theory and practice are discussed, along with suggestions for future research.
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"Applications of multiscale ¯nite element methods." In Multiscale Finite Element Methods, 1–69. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-09496-0_5.

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"Higher-order nite element discretization." In Higher-Order Finite Element Methods, 146–237. Chapman and Hall/CRC, 2003. http://dx.doi.org/10.1201/9780203488041-7.

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"Numerical solution of nite element equations." In Higher-Order Finite Element Methods, 272–317. Chapman and Hall/CRC, 2003. http://dx.doi.org/10.1201/9780203488041-9.

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"Multiscale ¯nite element methods using limited global information." In Multiscale Finite Element Methods, 1–28. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-09496-0_4.

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Тези доповідей конференцій з теми "Nite element method"

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Vacek, K., and P. Sváček. "On Finite Element Approximation of Incompressible Flow Problems: Comparison of Pressure Correction Methods and Coupled Approach." In Topical Problems of Fluid Mechanics 2022. Institute of Thermomechanics of the Czech Academy of Sciences, 2022. http://dx.doi.org/10.14311/tpfm.2022.023.

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The article focuses on comparison of discretizations of the Navier-Stokes equations using the nite element method. Several choices of nite element spaces are discussed. First, the conforming spaces (TH, SV) are used. Second, the nonconforming equal order choice of P1/P1 elements is made. For the latter case the discrete equations are solved by a pressure correction scheme for the Taylor-Hood and Scott-Vogelius elements, the arising system is solved by a direct solver. The numerical results are compared to experimental and reference data. Methods are applied for the flow over the backward-facing step and for the flow around the cylinder.
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Silva, Jonathan Esteban Arroyo, Felipe Dos Santos Loureiro, and Webe João Mansur. "Application of the spectral nite element method for elastic wave propagation problems in functionally graded materials." In III CMAC-SE - Congresso de Matemática Aplicada e Computacional Sudeste. SBMAC, 2015. http://dx.doi.org/10.5540/03.2015.003.02.0033.

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Senalp, Zafer A., and Bilgin Kaftanoglu. "Prediction of Wrinkling Behavior for Nonaxisymmetric Sheet Metal Parts by the Use of Finite Element Method." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/dac-14539.

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Abstract Wrinkling is a defect occurring in the flange part of the blank during the metal forming operation. There is not much previous work related with the wrinkling of nonaxisymmetric parts. In this work finite element method is used to obtain the wrinkled behavior of nonaxisymmetric parts. Shell element with five degrees of freedom is formulated and used in the program. The developed nite element program can both be used with and without blank holder application. The permanent deformed shape after wrinkling is also obtained. The theoretical results are compared with the experimental values.
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Valášek, Jan, and Petr Sváček. "Dynamic Mode Decompositions of Phonation Onset – Comparison of Different Methods." In Topical Problems of Fluid Mechanics 2022. Institute of Thermomechanics of the Czech Academy of Sciences, 2022. http://dx.doi.org/10.14311/tpfm.2022.024.

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Four dynamic mode decomposition (DMD) methods are used to analyze a simulation of the phonation onset carried out by in-house solver based on the nite element method. The dataset consists of several last periods of the flow-induced vibrations of vocal folds (VFs). The DMD is a data-driven and model-free method typically used for finding a low-rank representation of a high-dimensional system. In general, the DMD decomposes a given dataset to modes with mono-frequency content and associated complex eigenvalues providing the growth/decay rate that allows a favourable physical interpretation and in some cases also a short-term prediction of system behaviour. The disadvantages of the standard DMD are non-orthogonal modes and sensitivity to an increased noise level which are addressed by following DMD variants. The recursive DMD (rDMD) is an iterative DMD decomposition producing orthogonal modes. The total least-square DMD and the higher order DMD (hoDMD) are methods substantially reducing a high DMD sensitivity to noise. All methods identi ed very similar DMD modes as well as frequency spectra. Substantial difference was found in the real part of the spectra. The nal dataset reconstruction is the most accurate in the case of the recursive variant. The higher order DMD method also outperforms the standard DMD. Thus the rDMD and the hoDMD decompositions are promising to be used further for the parametrization of a VF motion.
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Subramaniam, Kalavathi, Albert Victor Kordesch, and Mazlina Esa. "Nine-Element Lumped Metal Finger Capacitor Model Extraction Method for RF Applications." In 2006 4th Student Conference on Research and Development. IEEE, 2006. http://dx.doi.org/10.1109/scored.2006.4339301.

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Papadopoulos, Michael, and Ephrahim Garcia. "Finite Element Error Localization Using the Error Matrix Method." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4169.

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Abstract A higher order version of the Error Matrix Method is proposed to increase the accuracy in the finite element error localization. The method retains a user specified number of terms from the appropriate binomial expansion. Jacobi’s iterative method is then proposed to solve the set of nonlinear equations. It is hypothesized that keeping the higher order terms will improve the error identification for the same number of coordinate degrees-of-freedom and modes. The method is implemented on a nine degree-of-freedom and an Euler-Bernoulli beam numerical examples. It is shown that while there needs to be a large number of measured coordinates and modes, the magnitude of the errors are more accurately identified.
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Zhu, Ying-Min, Chun-Yue Huang, Jian-Yuan Jia, and Kang-Qi Fan. "Simulation on Dynamic Characteristics of Micro Magnetic Acceleration Switch Based on Finite Element Method." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21204.

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According to the characteristic that the force between a permanent magnetic couple changes nonlinearly with the magnetic displacement, a novel micro acceleration switch of permanent magnetic force is designed. The stiffness of the beam suspension, the module mass in the micro switch, and the magnetic force of the permanent magnet couple are selected as the major structure parameters and nine acceleration switches with every kind of combinations of the structure parameters were designed by using an orthogonal array. A Finite Element Method (FEM) model is built to simulate the contact force between the module and the contactors and the operation of the nine switches under a preset excitation wave of the environmental acceleration. The first 6 order natural frequencies and the vibration modals of the micro acceleration switch are obtained. The range analysis is given based on the simulation results of the contact forces. The results reveal that, in the three major structure parameters, the stiffness of the beam suspension W affects the electrical contact reliability the best with the permanent magnetic force F secondly and the mass G the least. The combination of structure factors that results in the best electrical reliability is W1G2F2, namely, the beam suspension stiffness W of 2134N/m, the module mass of 1.99g and the permanent magnetic force of 0.21N.
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Wang, Jielong. "Nonlinear Finite Element Based Contact Modeling for Bolted Joints in Composite Laminates." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-68501.

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Abstract The paper developed a new numerical joint model based on nonlinear finite element method for the multiple bolted joints in composite laminates. The new joint model consists of the geometrically exact beam and shell elements, as well as the new Hertz contact elements. The geometrically exact elements, beams and shells, are used to model the bolts and laminates with nonlinear deformations, respectively. Meanwhile, the new contact elements apply the Hertz model to simulate the contact, slippage and bolt-laminate interaction. This contact element combined with the multi-point constraints to transfer the shear forces from one shell through beam to another shell element. As an essential part of the bolted joint model, a new type of geometrically exact shell element was developed with second-order accuracy and nine nodes. The strain-displacement relationship of this shell element was formulated according to the rotation-free Green-Lagrange strain tensor. This shell element approximated the higher-order components of strain tensor, ensuring it can accurately describes the real deformation of thin-walled composite laminates. Application of this joint model to a three-bolt, single-shear joint in composite laminates was presented, and its predictions are compared with those of commercial code ABAQUS. Numerical simulation results show that the new joint model is suitable for the design of bolted joints in composite laminates with good accuracy and high efficiency.
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Zhang, Sheguang, Kenneth M. Weems, Woei-Min Lin, Hongmei Yan, and Yuming Liu. "Application of a Quadratic Boundary Element Method to Ship Hydrodynamic Problems." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57187.

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This paper describes the implementation and application of a Quadratic Boundary Element Method (QBEM) to the 3-D, time domain potential flow solution of ship-wave hydrodynamic interaction problems. In QBEM, the geometry, singularity, and solution distributions on each panel are represented by bi-quadratic parametric functions defined by nine nodal values. QBEM has been shown to provide many theoretical advantages in accuracy and convergence versus the more conventional Constant Panel Method (CPM), but its application to real ship flow problems presents many challenges. This paper describes the implementation of QBEM into an existing time-domain ship motion and wave load prediction code, the Large Amplitude Motions Program (LAMP), and identifies and addresses some important numerical issues related to QBEM, such as mismatched grid points between neighboring panels, surface normal calculation on degenerate QBEM panels, the stability of the free surface and the solution and treatment of QBEM panels for body-nonlinear calculations. A number of practical cases are provided to compare QBEM with CPM and to validate QBEM against analytical solutions and experiments. The advantages of using QBEM for ship hydrodynamic problems and associated/unresolved numerical issues are also discussed.
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Kar, Vishesh Ranjan, and Subrata Kumar Panda. "Free Vibration Responses of Functionally Graded Spherical Shell Panels Using Finite Element Method." In ASME 2013 Gas Turbine India Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gtindia2013-3693.

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Free vibration responses of functionally graded spherical shell panels are investigated in the present article. A general mathematical model is developed based on higher order shear deformation theory mid-plane kinematics. The effective material properties are graded in the thickness direction according to a power-law distribution and it varies continuously from metal (bottom surface) to ceramic (top surface). The model is discretized using a nine noded quadrilateral Lagrangian element. A convergence test has been done with different mesh refinement and compared with the available published results. In addition to that the present study includes an ANSYS model check with the developed mathematical model to show the efficacy. New results are computed for different parameters such as volume fraction, thickness ratio, curvature ratio and support conditions which indicates the effect of parametric study on non-dimensional frequency parameters.
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Звіти організацій з теми "Nite element method"

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Chauhan. L52134 Development of Methods For Assessing Corrosion Metal Loss Defects In Casing Strings. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), July 2003. http://dx.doi.org/10.55274/r0010892.

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An industry survey, dominated by PRCI member companies, was undertaken to gather key information regarding the design, operation and inspection of well bore casing strings. The aim of the survey was to gather information regarding the design standards, fields, gas composition, completion configuration, operational details, inspection methods and type of damage found. Survey results representing 67 storage facilities with a total of 4724 wells were received. This represents approximately 16% of US gas storage facilities. Facilities with initial completion dates between 1920 and 1990 were represented within the survey. The date of conversion from production to gas storage of the responding facilities ranged from the 1920�s to 2000. Non-linear finite element analysis has been used to determine the significance of an isolated pit corrosion metal loss defect in tubing/casing strings subject to the bounding load cases. Pit defects of depths up to 80% of the wall thickness (t) and diameter 2t were investigated to determine the failure behavior under the nineteen bounding load cases. Nine full-scale burst tests were undertaken in order to determine whether existing assessment methods could be used to predict failure of casing and tubing. Failure loci of 2t diameter and 80% deep defects have been derived for casing subject to combined loading. Full scale testing has only been undertaken with internal pressure loading to validate the approach taken to predict failure.
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Łapińska, Justyna, Agata Sudolska, Joanna Górka, Iwona Escher, Grzegorz Kądzielawski, and Paweł Brzustewicz. Zaufanie pracowników do sztucznej inteligencji w przedsiębiorstwach przemysłowych funkcjonujących w Polsce. Raport z badania. Institute of Economic Research, July 2020. http://dx.doi.org/10.24136/eep.rep.2020.1.

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Анотація:
Sztuczna inteligencja (SI) coraz częściej wpływa na życie jednostek oraz funkcjonowanie społeczeństw jako całości. W ostatnim czasie rośnie również znaczenie sztucznej inteligencji w biznesie, w którym posiada ona coraz szerszy zakres zastosowań. Definicje sztucznej inteligencji różnią się w zależności od kontekstu, w którym to pojęcie jest używane. W najprostszym ujęciu przez sztuczną inteligencję rozumie się systemy lub maszyny na nich oparte, które naśladują ludzką inteligencję podczas wykonywania określonych zadań i dodatkowo mogą się interaktywnie doskonalić (uczyć) na podstawie zbieranych informacji. Postrzegane korzyści i zagrożenia związane z wdrażaniem w przedsiębiorstwach rozwiązań z zakresu sztucznej inteligencji mogą różnić się w zależności od tego, kto dokonuje oceny zjawiska. To, co dla pracodawcy stanowi korzyść (np. obniżenie kosztów pracy), przez pracowników może być postrzegane jako realne zagrożenie związane z utratą pracy (zastąpienie pracownika przez rozwiązania oparte o sztuczną inteligencję). Ograniczenie wspomnianych obaw będzie możliwe tylko wówczas, gdy sztuczna inteligencja będzie rozwijana i wdrażana w firmach w sposób właściwy, pozwalający zdobyć zaufanie pracowników. Zaufanie ukierunkowane na technologię jawi się jako niezwykle ważna i interesująca poznawczo kategoria. Zaufanie do technologii przejawia się w gotowości człowieka do bycia pod wpływem technologii, wynikającej z użyteczności tej technologii, przewidywalności skutków jej działania a także wiarygodności jej dostawców. Pojęcie zaufania do technologii odnosi się zatem do wiary, iż druga strona relacji – w tym przypadku technologia – będzie działać w sposób przewidywalny i niezawodny, zapewniający pozytywne rezultaty. Nie bez znaczenia jest tu również indywidualna skłonność jednostki do korzystania z technologii, będąca efektem jej cech osobowościowych, związanych m.in. z wcześniejszymi doświadczeniami, otwarciem na nowe doświadczania, chęcią ciągłego poznawania i uczenia się. Identyfikacja oraz pomiar zaufania do sztucznej inteligencji, rozumianej jako najbardziej zaawansowanej formy rozwoju technologii, jest swoistym wyzwaniem z uwagi na latentną naturę rozważanej zmiennej. Biorąc pod uwagę, że zaufanie pracowników do sztucznej inteligencji w przedsiębiorstwie jest konstruktem złożonym, wielowymiarowym i nieidentyfikowalnym bezpośrednio w zrealizowanym badaniu podjęto próbę jego opisu poprzez inne konstrukty badawcze złożone z elementów (zmiennych) identyfikowalnych, które odnoszą się do obserwowalnych cech. Konstrukty badawcze niższego szczebla to: ogólne zaufanie technologiczne, zaufanie do zaawansowanej technologii w przedsiębiorstwie, zaufanie wewnątrzorganizacyjne, indywidualne zaufanie kompetencyjne. Celem przeprowadzonego badania była ocena poziomu zaufania do sztucznej inteligencji pracowników przedsiębiorstw przemysłowych funkcjonujących w Polsce. Poziom wspomnianego zaufania zbadano w oparciu o cztery, wymienione wyżej, konstrukty badawcze niższego szczebla. Z uwagi na stosunkowo niski stopień rozpoznania w teorii i praktyce problematyki zaufania pracowników do sztucznej inteligencji, przeprowadzone badanie miało charakter eksploracyjny. Zostało zrealizowane w okresie luty–kwiecień 2020 r. w 29 przedsiębiorstwach funkcjonujących na terenie Polski. Ich dobór miał charakter celowy i wynikał z możliwości uzyskania w nich zgody na realizację pomiaru. Dobór respondentów w każdym z przedsiębiorstw miał także charakter celowy. Pomiar z udziałem wybranych w ten sposób osób zrealizowano metodą ankiety bezpośredniej. Wzięło w nim udział łącznie 792 respondentów. Opisane jednostki poddano pomiarowi w miejscu pracy. Stosownie do zaproponowanej metody zbierania danych, instrumentem pomiarowym wykorzystanym w badaniu był kwestionariusz ankietowy. Uzyskane wyniki poddano analizie w każdym z czterech zaproponowanych obszarów (konstruktów badawczych niższego rzędu), dokonano także syntetycznej oceny konstruktu złożonego, jakim jest zaufanie pracowników do sztucznej inteligencji w przedsiębiorstwie. Ocena syntetyczna wyniosła S=6,63 (w skali od 0 do 10) . Wynik ten należy interpretować z ostrożnym optymizmem, świadczy bowiem o umiarkowanie wysokim ogólnym zaufaniu pracowników do zaawansowanej technologii, w tym sztucznej inteligencji. Odwołując się do ocen cząstkowych dotyczących poszczególnych obszarów warto podkreślić, że owo zaufanie jest wspierane głównie przez indywidualne zaufanie kompetencyjne oraz zaufanie wewnątrzorganizacyjne. Te dwa komponenty zaufania są ze sobą ściśle powiązane. Wyniki badania wskazują jednocześnie na niższy poziom ocen uzyskanych w dwóch pozostałych komponentach opisywanego konstruktu, jakimi są ogólne zaufanie technologiczne oraz zaufanie do zaawansowanej technologii w przedsiębiorstwie.
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