A Novel Energy and Momentum Consistent Mixed Formulation for Coupled Nonlinear Electro‐Thermo‐Elastodynamics

In the present contribution, a novel mixed formulation aimed at the energy-momentum consistent simulation of coupled nonlinear electro-thermo-elastodynamic systems, in particular dielectric elastomer actuators, is proposed. It is essentially based on a mixed framework for elastodynamics in the case of polyconvex stored energy functions. In accordance with this framework, the properties of the rediscovered tensor cross product are exploited in a first step to derive a mixed formulation via a Hu-Washizu type extension of the stored energy function. Afterwards, the corresponding strong form is derived and supplemented with the (initial) boundary value problems of thermodynamics and electrostatics. By additionally choosing an appropriate polyconvexity-inspired energy density function, this procedure leads to a fully coupled electro-thermo-elastodynamic formulation that benefits from the properties of the underlying mixed framework. Furthermore, an energy-momentum consistent time integration scheme is proposed for the novel framework, where discrete derivatives in the sense of Gonzalez are employed. The formulation is second-order accurate and stable even for large time step sizes. Eventually, the performance of the novel formulation is illustrated in a numerical example

Entfernung eines Gebisses aus der Speiseröhre ohne deren Eröffnung nach seitlichem Halsschnitt (Tracheotomia lateralis)

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End states and subgap structure in proximity-coupled chains of magnetic adatoms

A recent experiment [Nadj-Perge et al., Science 346, 602 (2014)] provides evidence for Majorana zero modes in iron (Fe) chains on the superconducting Pb(110) surface. Here, we study this system by scanning tunneling microscopy using superconducting tips. This high-resolution technique resolves a rich subgap structure, including zero-energy excitations in some chains. We compare the symmetry properties of the data under voltage reversal against theoretical expectations and provide evidence that the putative Majorana signature overlaps with a previously unresolved low-energy resonance. Interpreting the data within a Majorana framework suggests that the topological gap is significantly smaller than previously believed. Aided by model calculations, we also analyze higher-energy features of the subgap spectrum and their relation to high-bias peaks which we associate with the Fe d-bands.Comment: 5+5 pages, 5+6 figure

PENGARUH BRAND IMAGE, KUALITAS PRODUK DAN PROMOSI PENJUALAN TERHADAP KEPUTUSAN PEMBELIAN SEPEDA MOTOR HONDA PADA PT CAPELLA DINAMIK NUSANTARA

The purpose of this study analyze the effect of Brand Image, Product Quality, and Sales Promotion on Purchase Decisions for Honda Motorcycles at PT Capella Dinamik Nusantara. This research uses quantitative descriptive research and the sampling technique in this study uses the slovin formula with a total of 70 respondents. Primary data in this study were taken by means of interviews and distributing questionnaires. The data processing technique used is descriptive analysis method and multiple linear regression analysis, classical assumption test, instrument test (validity and reliability), hypothesis testing, and coefficient of determination using SPSS for Windows program. The results of this study indicate that simultaneously brand image, product quality and promotion have a positive and significant effect on purchasing decisions for motorcycles at PT Capella Dinamik Nusantara. Promotion is the most dominant variable influencing motorcycle purchasing decisions at PT Capella Dinamik Nusantara. Adjusted R Square value of 0.253 which means 25.3% of purchasing decisions can be explained by variations of the three independent variables (brand image, product quality and promotion) while the remaining 74.7% is influenced by other variables not discussed in this study

Quantum Yu-Shiba-Rusinov dimers

Magnetic adatoms on a superconducting substrate undergo a quantum phase transition as their exchange coupling to the conduction electrons increases. For quantum spins, this transition is accompanied by screening of the adatom spin. Here, we explore the consequences of this screening for the phase diagrams and subgap excitation spectra of dimers of magnetic adatoms coupled by hybridization of their Yu-Shiba-Rusinov states and spin-spin interactions. We specifically account for higher spins, single-ion anisotropy, Ruderman-Kittel-Kasuya-Yosida coupling, and Dzyaloshinsky-Moriya interactions relevant in transition-metal and rare-earth systems. Our flexible approach based on a zero-bandwidth approximation provides detailed physical insight and is in excellent qualitative agreement with available numerical-renormalization group calculations on monomers and dimers. Remarkably, we find that even in the limit of large impurity spins or strong single-ion anisotropy, the phase diagrams for dimers of quantum spins remain qualitatively distinct from phase diagrams based on classical spins, highlighting the need for a theory of quantum Yu-Shiba-Rusinov dimers.Comment: 17 pages, 12 figure