63 research outputs found
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 ,
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 flieĂfähiges Komposit im Vergleich
Ziel dieser Dissertation ist der Vergleich des selbstadhäsiven, flieĂfähigen Komposits Vertise⢠Flow (Kerrâ˘) hinsichtlich seiner Eigenschaften. Im Bereich der werkstoffkundlichen Eigenschaften wurden Elastizitätsmodul, Biegefestigkeit und Vickershärte fĂźr Vertise⢠Flow (Kerrâ˘), drei flieĂfähige Komposite und acht Befestigungskomposite ermittelt und anschlieĂend 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 fĂźr Vertise⢠Flow (Kerrâ˘), sieben Adhäsivsysteme, drei flieĂfähige Komposite und acht Befestigungskomposite ermittelt und anschlieĂend verglichen. Bei der PrĂźfung der Verbundfestigkeit an humanen Zähnen wurden zylindrische PrĂźfkĂśrper verwendet, welche auĂer bei Vertise⢠Flow und den flieĂfähigen Kompositen aus dem Komposit Ceramâ˘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 durchgefĂźhrt. Die Ergebnisse der Arbeit entsprechen den eng gesteckten Indikationen fĂźr Vertise⢠Flow des Herstellers, eine direkte Anwendungsempfehlung ist fĂźr Vertise⢠Flow nicht auszusprechen
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Along the Spectrum of Women\u27s Rights Advocacy: A Cross-Cultural Comparison of Sexual Harassment Law in the United States and India
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Singleâuse technology for the production of cellular agricultural products : where are we today?
A group of the DECHEMA working group âSingle-Use Technology in Biopharmaceutical Manufactureâ 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
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