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Littérature scientifique sur le sujet « Lie Derivative. eng »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 8 février 2022

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Articles de revues sur le sujet "Lie Derivative. eng"

Cervantes-Sánchez, J. J., J. M. Rico-Martínez, G. González-Montiel, and E. J. González-Galván. "The differential calculus of screws: Theory, geometrical interpretation, and applications." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 6 (2009): 1449–68. http://dx.doi.org/10.1243/09544062jmes1195.

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This article presents a novel and original formula for the higher-order time derivatives, and also for the partial derivatives of screws, which are successively computed in terms of Lie products, thus leading to the automation of the differentiation process. Through the process and, due to the pure geometric nature of the derivation approach, an enlightening physical interpretation of several screw derivatives is accomplished. Important applications for the proposed formula include higher-order kinematic analysis of open and closed kinematic chains and also the kinematic synthesis of serial an

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Zhou, Jia, Liangyun Chen, and Yao Ma. "Generalized derivations of Lie triple systems." Open Mathematics 14, no. 1 (2016): 260–71. http://dx.doi.org/10.1515/math-2016-0024.

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AbstractIn this paper, we present some basic properties concerning the derivation algebra Der (T), the quasiderivation algebra QDer (T) and the generalized derivation algebra GDer (T) of a Lie triple system T, with the relationship Der (T) ⊆ QDer (T) ⊆ GDer (T) ⊆ End (T). Furthermore, we completely determine those Lie triple systems T with condition QDer (T) = End (T). We also show that the quasiderivations of T can be embedded as derivations in a larger Lie triple system.

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Nigsch, E. A., and J. A. Vickers. "Nonlinear generalized functions on manifolds." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2244 (2020): 20200640. http://dx.doi.org/10.1098/rspa.2020.0640.

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In this work, we adopt a new approach to the construction of a global theory of algebras of generalized functions on manifolds based on the concept of smoothing operators. This produces a generalization of previous theories in a form which is suitable for applications to differential geometry. The generalized Lie derivative is introduced and shown to extend the Lie derivative of Schwartz distributions. A new feature of this theory is the ability to define a covariant derivative of generalized scalar fields which extends the covariant derivative of distributions at the level of association. We

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COLOMBO, LEONARDO, FERNANDO JIMÉNEZ, and DAVID MARTÍN DE DIEGO. "DISCRETE SECOND-ORDER EULER–POINCARÉ EQUATIONS: APPLICATIONS TO OPTIMAL CONTROL." International Journal of Geometric Methods in Modern Physics 09, no. 04 (2012): 1250037. http://dx.doi.org/10.1142/s0219887812500375.

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In this paper we will discuss some new developments in the design of numerical methods for optimal control problems of Lagrangian systems on Lie groups. We will construct these geometric integrators using discrete variational calculus on Lie groups, deriving a discrete version of the second-order Euler–Lagrange equations. Interesting applications as, for instance, a discrete derivation of the Euler–Poincaré equations for second-order Lagrangians and its application to optimal control of a rigid body, and of a Cosserat rod are shown at the end of the paper.

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Warner, Brian, and Liza Van Zyl. "Discovery of Non-Radial Pulsations in the White Dwarf Primary of a Cataclysmic Variable Star." Symposium - International Astronomical Union 185 (1998): 321–22. http://dx.doi.org/10.1017/s0074180900238886.

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Non-radial pulsations in isolated white dwarfs have been known for 25 years and it has been shown that the hydrogen-rich (DA) white dwarfs have a high probability of pulsating if they lie in the instability strip with effective temperature between 11500 and 13200 K - the ZZ Ceti stars (e.g. Kepler and Nelan 1993). Analysing techniques developed for such stars allow derivation of masses, luminosities, rotation periods, hydrogen surface layer masses and other properties (e.g. Kepler and Bradley 1995). A number of binary systems are known in which the primary is a white dwarf; dominant in this cl

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Klumpp, Gerson. "Functions of valency operators in Kamas." Lingua Posnaniensis 58, no. 2 (2016): 189–206. http://dx.doi.org/10.1515/linpo-2016-0014.

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AbstractThis article provides an account of the functional range of Kamas valency operators. Kamas is an extinct South Siberian language of the Samoyed branch of Uralic, which was in close contact with Turkic for many centuries. In the early 20th century, Kamas had two valency operators: (i) -Tə derived transitive from intransitive verbs as well as causative from transitive verbs; and (ii) -Ō derived intransitive from transitive verbs; in addition the intransitivizer, probably departing from pairs like edə- ‘hang up (tr.)’ > ed-ȫ- ‘hang (itr.)’, had acquired the function of specifying impe

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Piestrzeniewicz, Cezary, Dariusz Wrona, and Ewa Jadczuk-Tobjasz. "Apple rootstock trials at Warsaw University of Life Sciences-SGGW, Poland." Horticultural Science 45, No. 2 (2018): 69–75. http://dx.doi.org/10.17221/205/2016-hortsci.

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valuation of 22 dwarfing and semi-dwarfing apple rootstocks for several scion cultivars was conducted on fertile soil in the years 1995–2010. It was found that most of the new rootstocks performed similarly to M.9 EMLA with respect to vigour, yield, cropping efficiency and fruit mass. These rootstocks would not be, therefore, a good replacement for M.9 in Polish climatic conditions. The most promising rootstock was B 9 and some of its derivatives, e.g., B 146, B 396, P 59 and P 60. However, their suitability may be limited to particular cultivars grown under similar soil conditions.

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Wei Yang, Hong, Min Guo, and Hailun He. "Conservation Laws of Space-Time Fractional mZK Equation for Rossby Solitary Waves with Complete Coriolis Force." International Journal of Nonlinear Sciences and Numerical Simulation 20, no. 1 (2019): 17–32. http://dx.doi.org/10.1515/ijnsns-2018-0026.

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AbstractThe study of Rossby solitary waves are of great significance in physical oceanography, atmospheric physics, water conservancy project, military and communications engineering, etc. All the time, in the study of Rossby solitary waves, people have been focusing on integer order models. Recently, fractional calculus has become a new research hotspot, and it has opened a new door to research atmospheric and ocean. Thus, the fractional order model has the potential value in the study of Rossby solitary waves. In the present paper, according to the quasi-geostrophic potential vorticity equat

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Lazic, Anita, Natasa Valentic, Nemanja Trisovic, Slobodan Petrovic, and Gordana Uscumlic. "Synthesis, structure and biological properties of active spirohydantoin derivatives." Chemical Industry 70, no. 2 (2016): 177–99. http://dx.doi.org/10.2298/hemind150205025l.

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Spirohidantoins represent an pharmacologically important class of heterocycles since many derivatives have been recognized that display interesting activities against a wide range of biological targets. First synthesis of cycloalkanespiro-5-hydantoins was performed by Bucherer and Lieb 1934 by the reaction of cycloalkanone, potassium cyanide and ammonium-carbonate at reflux in a mixture of ethanol and water. QSAR (Quantitative Structure-Activity Relationship) studies showed that a wide range of biological activities of spirohydantoin derivatives strongly depend upon their structure. This paper

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BAVULA, V. V. "DIXMIER'S PROBLEM 6 FOR SOMEWHAT COMMUTATIVE ALGEBRAS AND DIXMIER'S PROBLEM 3 FOR THE RING OF DIFFERENTIAL OPERATORS ON A SMOOTH IRREDUCIBLE AFFINE CURVE." Journal of Algebra and Its Applications 04, no. 05 (2005): 577–86. http://dx.doi.org/10.1142/s0219498805001368.

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In [6], J. Dixmier posed six problems for the Weyl algebra A1 over a field K of characteristic zero. Problems 3, 5,and 6 were solved respectively by Joseph and Stein [7]; the author [1]; and Joseph [7]. Problems 1, 2, and 4 are still open. For an arbitrary algebra A, Dixmier's problem 6 is essentially aquestion: whether an inner derivation of the algebra A of the type ad f(a), a ∈ A, f(t) ∈ K[t], deg t(f(t)) > 1, has a nonzero eigenvalue. We prove that the answer is negative for many classes of algebras (e.g., rings of differential operators [Formula: see text] on smooth irreducible algebra

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Plus de sources

Thèses sur le sujet "Lie Derivative. eng"

Bairrada, Alexandre da Silva. "Controlabilidade de sistemas não lineares de equações diferenciais ordinárias /." São José do Rio Preto : [s.n.], 2009. http://hdl.handle.net/11449/94209.

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Orientador: Adalberto Spezamiglio<br>Banca: Rita de Cássia Pavani Lamas<br>Banca: Jair Silvério dos Santos<br>Resumo: Este trabalho estudamos a controlabilidade de sistemas de n equações dife renciais ordinárias não lineares de entrada única, via mudança local de coordenadas e retroalimentação, que levam o sistema a um linear controlável. O elemento fundamental e a existência de uma função de grau relativo n em relação ao sistema, conceito que envolve a Derivada de Lie de um campo de vetores, que se constitui numa condição necessária e suficiente para a controlabilidade.<br>Abstract: In this w

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Livres sur le sujet "Lie Derivative. eng"

Stephen, Connelly. 5 The Implementation of the EU Bank Recovery and Resolution Directive’s Derivative Bail-in Powers in the UK. Oxford University Press, 2016. http://dx.doi.org/10.1093/law/9780198754411.003.0005.

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This chapter explores the implementation of the EU Bank Recovery and Resolution Directive’s (BRRD) bail-in powers in the UK. Special bail-in powers have been in the legislative sights of HM Treasury (HMT) since the Independent Commission on Banking’s report in 2011. The chapter considers inter alia the following issues raised by the power to bail-in derivatives in the Banking Act 2009: what is a ‘derivative’ and does HMT agree with the BRRD’s definition; the critical role of close-out netting, and whether this is appropriate for all derivatives in the widest sense; the appropriateness of safeg

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Hu, Xuhui. The syntax and semantics of Chinese resultatives. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198808466.003.0004.

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This chapter investigates the syntactic derivation of Chinese resultatives. While in English resultatives the [uDiv] feature is valued with the mechanism of feature sharing, in Chinese resultatives it is valued by a verbal C-functor, by nature equivalent to en in flatten. The Chinese V–V resultative compound is a single de-adjectival verb: the first verb is a verbal C-functor and the second one is an adjective. The V–V resultative construction is therefore analyzed as a causative construction involving a de-adjectival verb. This single hypothesis provides a unified account of the seemingly mys

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Chapitres de livres sur le sujet "Lie Derivative. eng"

Tu, Loring W. "Differential Graded Algebras." In Introductory Lectures on Equivariant Cohomology. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691191751.003.0018.

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This chapter investigates differential graded algebras. Throughout the chapter, G will be a Lie group with Lie algebra g. On a manifold M, the de Rham complex is a differential graded algebra, a graded algebra that is also a differential complex. If the Lie group G acts smoothly on M, then the de Rham complex Ω‎(M) is more than a differential graded algebra. It has in addition two actions of the Lie algebra: interior multiplication and the Lie derivative. A differential graded algebra Ω‎ with an interior multiplication and a Lie derivative satisfying Cartan's homotopy formula is called a g-differential graded algebra. To construct an algebraic model for equivariant cohomology, the chapter first constructs an algebraic model for the total space EG of the universal G-bundle. It is a g-differential graded algebra called the Weil algebra.

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Gerber, Jane S. "Conclusion." In Cities of Splendour in the Shaping of Sephardi History. Liverpool University Press, 2020. http://dx.doi.org/10.3828/liverpool/9781904113300.003.0008.

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The last section of this chapter marks the end of one form of Jewish life and the beginning of another for the Jews of the Iberian peninsula. Like all other Jews, Sephardim collectively mourned the loss of Zion; as Sephardim, they also collectively mourned the loss of Spain. The chapter discusses the deportation of the Jews from their ancient homeland and how they produced the first diaspora in history, although the term was not applied to Jewish settlements outside the Land of Israel until Hellenistic time. Jewish life unfolded between exile and return. Some Jewish diasporas were ephemeral, others more enduring. Some diasporas were exceptionally creative, others merely derivative. Ultimately, the chapter illustrates how the Jewish communities tended to relate to each other through shared memories and common traditions and laws, regardless of the cultural level.

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Poonia, Amrita. "Antimicrobial Edible Films and Coatings for Fruits and Vegetables." In Food Science and Nutrition. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5207-9.ch009.

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Non-degradable packaging materials are doing much damage to the environment. So the interest has been developed in biodegradable films and coatings these days. Use of edible films and coatings is eco-friendly technology used for enhancing the shelf life of the fruits and vegetables. The use of antimicrobial compounds in edible coatings of proteins, starch, cellulose derivatives, chitosan, alginate, fruit puree, and egg albumin has been successfully added to the edible films and coatings. This chapter focuses on the development of edible films and coatings with antimicrobial activity, effect of these coatings on the target microorganisms, the influence of these antimicrobial agents on mechanical & barrier properties and application of antimicrobial edible coatings on the quality of fresh fruits and vegetables.

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Poonia, Amrita. "Antimicrobial Edible Films and Coatings for Fruits and Vegetables." In Advances in Environmental Engineering and Green Technologies. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0591-4.ch014.

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Schwartz, David G., Monica Divitini, and Terje Brasethvik. "On Knowledge Management in the Internet Age." In Internet-Based Organizational Memory and Knowledge Management. IGI Global, 2000. http://dx.doi.org/10.4018/978-1-878289-82-7.ch001.

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Knowledge management in general, and Internet-based knowledge management in particular, is one of the foremost strategic directions being investigated and adopted by corporations today. The promises of better decision making, faster turnaround times, improved organizational communication, and higher levels of cooperation and interaction among personnel, have all combined to create a holy grail kind of aura. Yet, like the grail the goals here are elusive, and the road to reaching them is long and fraught with pitfalls. Each of us, as individuals, performs a variety of functions that can be termed knowledge management. We remember things: names, numbers, experiences, and procedures. We know how to do things such as ride a bike; bake a cake; calculate a derivative; fix a flat tire. We know where to find information that we don’t remember on our own: we write things down; file them; enter them in a PDA. Some of us do it better, some of us are chronically disorganized, but at the end of the day each of us is performing his or her own knowledge management function.

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Goerlach, Christian, Anne-Katrin Brehm, and Bradley Lonnen. "FMIs – Knights in Shining Armour?" In Analyzing the Economics of Financial Market Infrastructures. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8745-5.ch004.

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Great hope is being pinned on FMIs. They lie at the heart of the financial system and enable the post-trading business by successfully completing trades and concentrating as well as mitigating risks. This end of the payment and securities settlement business does not usually attract much attention: It is expected to be there and function. In this respect, it is comparable to oxygen in the air – most people do not think about it, however, if something is wrong with it, things can turn bad extremely quickly. Such was the case with the Lehman crisis of 2008, playing a major role in the unfolding of the global crisis of the late 2000s. It became apparent just how vital these FMIs were in enabling the continuation of the globe's securities & derivatives exchanges. In particular, CCPs played a major role in keeping transaction processing ticking over. It became evident which knock on effects the downturn of one institution can have on the global financial landscape. As such, we all depend on those markets and on the performance of what can only be described as ‘knights in shining armour'.

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Goody, R. M., and Y. L. Yung. "Band Models." In Atmospheric Radiation. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195051346.003.0006.

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Radiative heating calculations in the atmosphere involve four distinguishable scales of frequency. First, there is the comparatively slow variation with frequency of the Planck function and its derivative with respect to temperature. About one-half of the radiation from a black body at terrestrial temperatures lies in a wave number range of 500 cm-1. The second scale is that of the unresolved contour of a band. For atmospheric molecules other than water vapor, the Planck function is effectively constant over a single band; water vapor bands must be divided into sections of the order of 50 cm-1 wide before this is so. For a rotating molecule, the next relevant scale of frequency is that of the spacing between rotation lines, approximately 1-5 cm-1. Finally, there is the monochromatic scale on which the absorption coefficient may be treated as a constant, and for which Lambert’s absorption law is obeyed: of the order of one-fifth of a line width ≃ 2 x 10-2 cm-1 for a gas at atmospheric pressure, down to 2 x 10-4cm-1 for a Doppler line in the middle atmosphere. This step takes us to a division of the frequency scale that, when taken together with other features of the calculation, presents a formidable computation task. Calculations can, of course, be made and are made at this limiting spectral resolution (line-by-line calculations) but, despite the fact that they are technically feasible with modern computers, such calculations are rare and are usually performed to provide a few reference cases. The great majority of investigations make use of averages over many lines, embracing spectral ranges that are small compared to a band contour (narrow-band models), or over complete bands (wide-band models), or over the entire thermal spectrum (emissivity models.) There are a number of reasons for working with spectral averages. Practical considerations are that important classes of laboratory measurements, and most atmospheric observations (e.g., satellite radiometry) are made with some spectral averaging, often comparable to that of narrow-band models.

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Coppens, Philip. "X-ray Diffraction and the Electrostatic Potential." In X-Ray Charge Densities and Chemical Bonding. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195098235.003.0010.

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The distribution of positive and negative charge in a crystal fully defines physical properties like the electrostatic potential and its derivatives, the electric field, and the gradient of the electric field. The electrostatic potential at a point in space, defined as the energy required to bring a positive unit of charge from infinite distance to that point, is an important function in the study of chemical reactivity. As electrostatic forces are relatively long-range forces, they determine the path along which an approaching reactant will travel towards a molecule. A nucleophilic reagent will first be attracted to the regions where the potential is positive, while an electrophilic reagent will approach the negative regions of the molecule. As the electrostatic potential is of importance in the study of intermolecular interactions, it has received considerable attention during the past two decades (see, e.g., articles on the molecular potential of biomolecules in Politzer and Truhlar 1981). It plays a key role in the process of molecular recognition, including drug-receptor interactions, and is an important function in the evaluation of the lattice energy, not only of ionic crystals. This chapter deals with the evaluation of the electrostatic potential and its derivatives by X-ray diffraction. This may be achieved either directly from the structure factors, or indirectly from the experimental electron density as described by the multipole formalism. The former method evaluates the properties in the crystal as a whole, while the latter gives the values for a molecule or fragment “lifted” out of the crystal. Like other properties derived from the charge distribution, the experimental electrostatic potential will be affected by the finite resolution of the experimental data set. But as the contribution of a structure factor F(H) to the potential is proportional to H−2, as shown below, convergence is readily achieved. A summary of the dependence of electrostatic properties of the magnitude of the scattering vector H is given in Table 8.1, which shows that the electrostatic potential is among the most accessible of the properties listed.

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Pierrus, J. "Some essential mathematics." In Solved Problems in Classical Electromagnetism. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198821915.003.0001.

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This chapter introduces most of the important mathematics that will be used repeatedly throughout this book. Whilst scalars like the electric potential Ф and the vector fields E and B are familiar quantities in electricity and magnetism, it is not always known that they are examples of a mathematical form termed a tensor. More sophisticated tensors are required in some descriptions and theories in electrodynamics. As tensor notation is compact and usually allows for a simple derivation of a result, the chapter begins with a series of questions involving Cartesian tensors. The results obtained here will facilitate the solution of many questions in subsequent chapters. Readers who are not familiar with tensors are advised to consult Appendix A before proceeding. Towards the end of this Appendix a ‘checklist for detecting errors when using tensor notation’ is given, which will hopefully provide some help for the uninitiated.

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Lærke, Mogens. "“De summa rerum”." In Leibniz's Key Philosophical Writings. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198844983.003.0003.

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This chapter is dedicated to a perplexing set of philosophical fragments today known as “De summa rerum”. Written by the young Leibniz in 1675–6, toward the end of his formative years in Paris, they deal with fundamental topics of philosophy including the first principles of philosophy, the nature of mind and perception, the nature and existence of God, the derivation of particular things from God, and modal philosophy. The “De summa rerum” fragments do not represent a unified philosophical attempt. Written at a time when Leibniz’s intellectual mindset had been both upset and profoundly stimulated by his encounter with the Parisian intellectual scene and his discovery of mathematics, they rather read like a set of philosophical test balloons flying in a great many directions. This chapter focuses on one particularly important strand of these reflections, informed by Spinoza and Spinozism via Leibniz’s exchanges with Ehrenfried Walther von Tschirnhaus.

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Actes de conférences sur le sujet "Lie Derivative. eng"

Murakami, H. "On the Vector-Valued Cauchy Stress 2-Form and Its Stress Rate." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41939.

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Using exterior differential forms, basic equations of continuum mechanics are presented in direct notation. To this end, Elie Cartan’s vector-valued Cauchy stress 2-form is introduced. Its Lie derivative along the world line becomes the Truesdell stress rate. In the presentation, the notation adopted by Theodore Frankel (The Geometry of Physics, Cambridge, New York, 1997) is utilized. With the use of exterior differential forms, complicated computations in tensor analyses in curvilinear coordinates are dramatically simplified. As specific examples, the following subjects are presented: (i) Pio

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Hamper, Martin B., Cheng Wei, and Ahmed A. Shabana. "Use of ANCF Surface Geometry in the Rigid Body Contact Problem: Application to Railroad Vehicle Dynamics." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35421.

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In the analysis of multibody system (MBS) dynamics, contact between two arbitrary rigid bodies is a fundamental feature in a variety of models. Many procedures have been proposed to solve the rigid body contact problem, most of which belong to one of two categories: off-line and on-line contact search methods. This investigation will focus on the development of a contact surface model for the rigid body contact problem in the case where an on-line three-dimensional non-conformal contact evaluation procedure, such as the elastic contact formulation - algebraic equations (ECF-A), is employed. It

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Zhong, Shuncong, and S. Olutunde Oyadiji. "Response-Only Frequency-Domain Method for Structural Damage Detection." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87650.

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This paper proposes a response-only method in frequency domain for structural damage detection by using the derivative of natural frequency curve of beam-like structures with a traversing auxiliary mass. The approach just uses the response time history of beam-like structures and does not need the external source of force excitation. The natural frequencies of a damaged beam with a traversing auxiliary mass change due to change in flexibility and inertia of the beam as the auxiliary mass is traversed along the beam. Therefore the auxiliary mass can enhance the effects of the crack on the dynam

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Walker, Isobel D., J. F. Davidson, D. J. Wheatley, K. MacArthur, and T. J. Spyt. "EFFECTS OF CONSTANT INFUSION OF ILOPROST, A STABLE PROSTACYCLIN DERIVATIVE DURING CARDIOPULMONARY BYPASS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643585.

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Prostacyclin (PGI2) is a potent inhibitor of platelet aggregation but it is highly unstable. Iloprost (Schering A.G.) is a stable carbacyclin derivative of PGI2 which is also a potent inhibitor of platelet aggregation. The effect of constant Iloprost infusion during cardiopulmonary bypass (CPB) on blood loss, platelet numbers, secretory proteins and platelet sequestration was studied in 50 adult males undergoing CPB for elective coronary vein bypass graft surgery.In a double-blind, randomised, placebo-controlled study (25 patients in each group) intravenous infusion of Iloprost was commenced a

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Ko¨nig, Thomas, Susanne Lehner, and Johannes Schulz-Stellenfleth. "Derivation of Sea Ice Parameters Using ENVISAT ASAR Data." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28300.

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This study presents methods for sea ice analysis which make use of SAR wave mode data products, so-called imagettes, to be provided by the European satellite ENVISAT every 100 km along the track, thus forming a particulary dense coverage of the polar regions. Prior to ENVISAT a reprocessed ERS-2 wave mode data set is used to derive sea ice variables like deformation energy. The results are compared to sea ice model runs and SSM/I data. Furthermore, ENVISAT data are of particular interest for observation of the damping of ocean waves by sea ice as pairs of high resolution images with different

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Kang, Changmuk, and Yoo S. Hong. "Dynamic Disassembly Planning for Remanufacturing of Multiple Types of Products." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28657.

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With the increased need for remanufacturing of end-of-life products, achieving economic efficiency in remanufacturing is urgently needed. The purpose of this study was to devise a cost-minimization plan for disassembly and remanufacturing of end-of-life products returned by consumers. A returned end-of-life product is disassembled into remanufacturable parts, which are supposed to be used for new products after being remanufactured. Each end-of-life product is disassembled into parts at variable levels as needed, taking into account not only disassembly but also manufacturing, remanufacturing,

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Brandt, Sascha, Matthias Fischer, Maria Gerges, Claudius Jähn, and Jan Berssenbrügge. "Automatic Derivation of Geometric Properties of Components From 3D Polygon Models." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67528.

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To detect errors or find potential for improvement during the CAD-supported development of a complex technical system like modern industrial machines, the system’s virtual prototype can be examined in virtual reality (VR) in the context of virtual design reviews. Besides exploring the static shape of the examined system, observing the machines’ mechanics (e.g., motor-driven mechanisms) and transport routes for the material transport (e.g., via conveyor belts or chains, or rail-based transport systems) can play an equally important role in such a review. In practice it is often the case, that t

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Holzinger, Stefan, and Johannes Gerstmayr. "Explicit Time Integration of Multibody Systems Modelled With Three Rotation Parameters." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22261.

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Abstract Rigid bodies are an essential part of multibody systems. As there are six degrees of freedom in rigid bodies, it is natural but also precarious to use three parameters for the displacement and three parameters for the rotation parameters — since there is no singularity-free description of spatial rotations based on three rotation parameters. Standard formulations based on three rotation parameters avoid singularities, e.g. by applying reparameterization strategies during the time integration of the rotational kinematic equations. Alternatively, Euler parameters are commonly used to av

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Toth, Michael J., Colby F. Lewallen, Joseph C. Hanson, Shenghai Wang, and William Singhose. "Crane Lift-Off Control of Inclined Payloads." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5203.

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It is difficult for crane operators to lift and maneuver payloads without causing significant, uncontrolled motion. Consequently, research in the area of crane operation has focused on designing controllers to minimize payload swing. However, lifting long and slender payloads (e.g., steel I-beams) from a non-level surface (e.g., like many outdoor construction sites) has not been addressed in much detail. This paper evaluates the amplitude of residual swing and robustness of two different control methodologies while hoisting a slender payload up into the air from an inclined surface. A semi-aut

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Dua, Dipankar, Mohammad Khajavi, and Matthew Hill. "Life Extension of Power Turbine Disks Exposed to In-Service Corrosion Damage." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63366.

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Siemens Energy has a large fleet of aero derivative gas turbines installed in oil & gas and power generation applications globally. Over the past several years, several incidents of disk corrosion damage have been observed during the power turbine overhauls especially for the units fielded in marine environment. Most of the corrosion attack has been observed at disk firtree (blade attachment features), gas washed disk faces and torque transmission features. In all of these cases the mechanism for corrosion has been identified as Low Temperature Hot Corrosion (LTHC) also known as Type-II su

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