Spin Conduction in Anisotropic 3-D Topological Insulators

When topological insulators possess rotational symmetry their spin lifetime is tied to the scattering time. We show that in anisotropic TIs this tie can be broken and the spin lifetime can be very large. Two different mechanisms can obtain spin conduction over long distances. The first is tuning the Hamiltonian to conserve a spin operator $\cos \phi \, \sigma_x + \sin \phi \, \sigma_y$, while the second is tuning the Fermi energy to be near a local extremum of the energy dispersion. Both mechanisms can produce persistent spin helices. We report spin lifetimes and spin diffusion equations.Comment: Added a page of additional text and refined the presentation. Main content unchange

AReS and MaRS - Adversarial and MMD-Minimizing Regression for SDEs

Stochastic differential equations are an important modeling class in many disciplines. Consequently, there exist many methods relying on various discretization and numerical integration schemes. In this paper, we propose a novel, probabilistic model for estimating the drift and diffusion given noisy observations of the underlying stochastic system. Using state-of-the-art adversarial and moment matching inference techniques, we avoid the discretization schemes of classical approaches. This leads to significant improvements in parameter accuracy and robustness given random initial guesses. On four established benchmark systems, we compare the performance of our algorithms to state-of-the-art solutions based on extended Kalman filtering and Gaussian processes.Comment: Published at the Thirty-sixth International Conference on Machine Learning (ICML 2019

Ein selbstadhäsives fließfähiges Komposit im Vergleich

Ziel dieser Dissertation ist der Vergleich des selbstadhäsiven, fließfähigen Komposits Vertise™ Flow (Kerr™) hinsichtlich seiner Eigenschaften. Im Bereich der werkstoffkundlichen Eigenschaften wurden Elastizitätsmodul, Biegefestigkeit und Vickershärte für Vertise™ Flow (Kerr™), drei fließfähige Komposite und acht Befestigungskomposite ermittelt und anschließend in Beziehung zueinander gesetzt. Des Weiteren wurde die Druck-Scherfestigkeit an humanen Zähnen nach 24 Stunden und nach 25000 Thermolastwechseln zwischen 5°C und 55°C für Vertise™ Flow (Kerr™), sieben Adhäsivsysteme, drei fließfähige Komposite und acht Befestigungskomposite ermittelt und anschließend verglichen. Bei der Prüfung der Verbundfestigkeit an humanen Zähnen wurden zylindrische Prüfkörper verwendet, welche außer bei Vertise™ Flow und den fließfähigen Kompositen aus dem Komposit Ceram•X™ mono (Dentsply DeTrey) bestanden. Diese wurden mit einer Traversengeschwindigkeit von 1 mm/min parallel zur Dentin-/Schmelzfläche abgeschert. Zur Veranschaulichung der Ergebnisse wurden rasterelektronenmikroskopische Bilder angefertigt. Die Messwerte wurden statistisch ausgewertet und grafisch dargestellt. Zur statischen Absicherung der Ergebnisse wurde der t-Test nach Student durchgeführt. Die Ergebnisse der Arbeit entsprechen den eng gesteckten Indikationen für Vertise™ Flow des Herstellers, eine direkte Anwendungsempfehlung ist für Vertise™ Flow nicht auszusprechen

Reply to “Comment on ‘Temperature-dependent orientational ordering on a spherical surface modeled with a lattice spin model’ ”

A reply to the comment of S. Romano, Phys. Rev. E 2015 on our previous paper is provided

Along the Spectrum of Women\u27s Rights Advocacy: A Cross-Cultural Comparison of Sexual Harassment Law in the United States and India

This Comment compares the development of sexual harassment law in the United States and India. It strives to contribute to this global feminist debate by highlighting the successes and failures of each country\u27s respective anti-harassment protections. It also compares the United States\u27 and India\u27s legal approaches to the problem of workplace sexual harassment. The Comment also discusses the successes and failures of the U.S. and Indian protections in a manner that attempts to minimize the problems present in cross-cultural studies

Single‐use technology for the production of cellular agricultural products : where are we today?

A group of the DECHEMA working group “Single-Use Technology in Biopharmaceutical Manufacture” is investigating the potential use of single-use systems for cellular agricultural applications. The preliminary results are summarized in this article

LipidXplorer: A Software for Consensual Cross-Platform Lipidomics

LipidXplorer is the open source software that supports the quantitative characterization of complex lipidomes by interpreting large datasets of shotgun mass spectra. LipidXplorer processes spectra acquired on any type of tandem mass spectrometers; it identifies and quantifies molecular species of any ionizable lipid class by considering any known or assumed molecular fragmentation pathway independently of any resource of reference mass spectra. It also supports any shotgun profiling routine, from high throughput top-down screening for molecular diagnostic and biomarker discovery to the targeted absolute quantification of low abundant lipid species. Full documentation on installation and operation of LipidXplorer, including tutorial, collection of spectra interpretation scripts, FAQ and user forum are available through the wiki site at: https://wiki.mpi-cbg.de/wiki/lipidx/index.php/Main_Page