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Search Results: 1 - 10 of 4653 matches for " Wolfgang "
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On the Modal and Non-Modal Model Reduction of Metallic Structures with Variable Boundary Conditions  [PDF]
Wolfgang Witteveen
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.26037
Abstract: Vibration mode based model reduction methods like Component Mode Synthesis (CMS) will be compared to methods coming from control engineering, namely moment matching (MM) and balanced truncation (BT). Conclusions based on the theory together with a numerical demonstration will be presented. The key issues on which the paper is focused are the reduction of metallic structures, the sensitivity of the reduced model to varying boundary conditions, full system response, accurate statics and the possibility to determine “a priori” the number of needed modes (trial vectors). These are important topics for the use of reduction methods in general and in particular for the implementation of FE models in multi body system dynamics where model reduction is widely used. The intention of this paper is to give insight into the methods nature and to clarify the strengths and limitations of the three methods. It turns out, that in the considered framework CMS delivers the best results together with a clear strategy for an “a priori” selection of the modes (trial vectors).
Sequences and Limits  [PDF]
Wolfgang Mueckenheim
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.52007
Abstract: It is widely held that irrational numbers can be represented by infinite digit-sequences. We will show that this is not possible. A digit sequence is only an abbreviated notation for an infinite sequence of rational partial sums. As limits of sequences, irrational numbers are incommensurable with any grid of decimal fractions.
Flaporhexis: Alternative Way to Make a Femtosecond Laser Corneal Flap  [PDF]
Wolfgang A. Pfaeffl
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.43042
Abstract:

Flaporhexis, a technique to make the femtosecond laser corneal flap was developed primarily to reduce the mechanical trauma associated with separating the corneal tissue by taking advantage of the cornea’s natural anatomy and was first described in a peer reviewed artice in 2008. The anterior part of the cornea tends to be stronger, thereby allowing tearing (Greek “rhexis”) along the preformed cuts of the femtosecond photo disruption. Flaporhexis differs from Binder’s technique of “hinge opening as published in 2006 by opening the flap from the opposite side. If a femtosecond flap lift is performed correctly, the surgeon will find a virgin, uniform, dry stromal bed, which had not been manipulated by any surgical instrument and is therefore perfect for wavefront guided laser surgery as “Sub-Bowmans Keratomileusis”.

The COP9 Signalosome Controls Adipocyte Differentiation by Regulating CHOP Protein Stability  [PDF]
Xiaohua Huang, Wolfgang Dubiel
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B050
Abstract:

Obesity is a serious health problem of our time. Dysfunction of adipogenesis, the differentiation of adipocytes, is a hallmark of obesity. Therefore here we investigate the role of the COP9 signalosome and of CHOP in the differentiation of LiSa-2 preadipocytes.

The Development of a Data-Centred Conceptual Reference Model for Strategic GRC-Management  [PDF]
Volker Nissen, Wolfgang Marekfia
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.72007
Abstract:

Until now there are only few ideas for an integrated governance, risk and compliance (GRC) management available with these referring to the management process of GRC only. In literature, mainly specific questions at a detailed level, like the automation of different controls, are discussed in the GRC context. To be in the position to entirely realise benefit potentials (e.g. improvement of processes), it is necessary to have an integrated GRC-Management focusing on the strategic business objectives. Starting from the requirements, this article deals with general guidelines for strategic GRC-Management showing which aspects have to be considered in terms of an integral approach. On this basis, a data-centred reference model explicates the structural connections of GRC-related data, and lays the basis for the implementation in practice.

The marimba: musical and secret language of the political violence in Guatemala La marimba: lenguaje musical y secreto de la violencia política en Guatemala
Wolfgang DIETRICH,Wolfgang DIETRICH
América Latina Hoy , 2010,
Abstract: The author reflects the construction of national music while the arise of the nation State in Guatemala. This development begins formally while the first decades of the nineteenth century and has not finished yet. For the myth of the Nation state and those who use it for their project of domination it is crucial that national music can be distinguished externally from musics generated by other nations while it can be applied internally for the aim of national homogenisation. Since the middle of the nineteenth century the music is used in Guatemala for the dissemination of ideologies that help to construct this myth. The vernacular music of the Maya people does not follow this logic. Hence it is considered inferior or incorrect . For the myth of the nation State only the totality of the people as an abstract concept can understand and appreciate the national music, but not the concrete or individual group. Assuming this the music is converted into an important tool of a repressive mechanism and deculturation. The marimba thus is the symbol of the nation State in Guatemala. The dictatorships of the army, who were the main responsible of the genocide of the Maya people, declared the chromatic marimba symbol of the nation. After a long history of violence the marimba desindianizada and therefore ladinizada reached the status of the national instrument. While the period of violence the chromatic marimba never ceased to sound in the nightclubs and the elegant restaurants of the Capital. In the meanwhile the Mayas of the highlands hided their K’ojomes in caves and ca ons to protect them from the army. Therefore the anarchic and rebellious diversity of the k’ojom’s tuning continues to be the vernacular and secret language of groups and individuals who do not belong to the national reality of the chromatic marimba. El autor refleja la construcción de la música nacional en el proceso del devenir del Estado nacional guatemalteco. Este proceso comienza formalmente a principios del siglo XIX, pero no ha concluido aún. Para el mito del Estado nación y para aquellos que lo utilizan para su proyecto de dominación, es de importancia d
Radial solutions of equations and inequalities involving the p-Laplacian
Wolfgang Reichel,Wolfgang Walter
Journal of Inequalities and Applications , 1997, DOI: 10.1155/s1025583497000040
Abstract: Several problems for the differential equation Lp ±u=g(r,u) ¢ € with ¢ € Lp ±u=r ¢ ’ ±(r ±|u ¢ € 2|p ¢ ’2u ¢ € 2) ¢ € 2 are considered. For ±=N ¢ ’1, the operator Lp ± is the radially symmetric p-Laplacian in ¢ N. For the initial value problem with given data u(r0)=u0,u ¢ € 2(r0)=u ¢ € 20 various uniqueness conditions and counterexamples to uniqueness are given. For the case where g is increasing in u, a sharp comparison theorem is established; it leads to maximal solutions, nonuniqueness and uniqueness results, among others. Using these results, a strong comparison principle for the boundary value problem and a number of properties of blow-up solutions are proved under weak assumptions on the nonlinearity g(r,u).
Radial solutions of equations and inequalities involving the -Laplacian
Reichel Wolfgang,Walter Wolfgang
Journal of Inequalities and Applications , 1997,
Abstract: Several problems for the differential equation are considered. For , the operator is the radially symmetric -Laplacian in . For the initial value problem with given data various uniqueness conditions and counterexamples to uniqueness are given. For the case where is increasing in , a sharp comparison theorem is established; it leads to maximal solutions, nonuniqueness and uniqueness results, among others. Using these results, a strong comparison principle for the boundary value problem and a number of properties of blow-up solutions are proved under weak assumptions on the nonlinearity .
Relativistic Transport Approach for Nucleus-Nucleus Collisions from SIS to SPS Energies
Wolfgang Ehehalt,Wolfgang Cassing
Physics , 1995, DOI: 10.1016/0375-9474(96)00097-8
Abstract: We formulate a covariant transport approach for high energy nucleus-nucleus collisions where the real part of the nucleon selfenergies is fitted to nuclear matter properties which are evaluated on the basis of a NJL-type Lagrangian for the quark degrees of freedom. The parameters of the quark-model Lagrangian are fixed by the Gell-Mann, Oakes and Renner relation, the pion- nucleon $\Sigma$-term, the nucleon energy as well as the nuclear binding energy at saturation density $\rho_0$. We find the resulting scalar and vector selfenergies for nucleons to be well in line with either Dirac-Brueckner computations for $\rho \leq 2 \rho_0$ or those from the phenomenological optical potential when accounting for a swelling of the nucleon at finite nuclear matter density. The meson-baryon interaction density is modelled to describe a decrease of the meson mass with baryon density. The imaginary part of the hadron selfenergies is determined by a string fragmentation model which accounts for the in-medium mass of hadrons in line with the 'chiral' dynamics employed. The applicability of the transport approach is demonstrated in comparison with experimental data from SIS to SPS energies. The enhancement of the K$^+/\pi^+$ ratio in A + A collisions compared to p + A reactions at AGS energies is reproduced within the 'chiral' dynamics. Furthermore, detailed predictions for the stopping in Pb + Pb collisions at 153 GeV/A are presented.
Non-connective K- and Nil-spectra of additive categorie
Wolfgang Lueck,Wolfgang Steimle
Mathematics , 2013,
Abstract: We present an elementary construction of the non-connective algebraic K-theory spectrum associated to an additive category following the contracted functor approach due to Bass. It comes with a universal property that easily allows us to identify it with other constructions, for instance with the one of Pedersen-Weibel in terms of Z^i-graded objects and bounded homomorphisms.
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