Overtures to the pulsational instability of ZZ Ceti variables

Results of nonradial, nonadiabatic pulsation calculations on hydrogen-rich white dwarf models are presented. In contrast to earlier attempts, the modeling builds on hydrodynamically simulated convective surface layers supplemented with standard interior models. Based on our stellar models and despite of various simple attempts to couple convection and pulsation we could not reproduce theoretically the presently adopted location of the observed blue edge of the ZZ Ceti variables. When the convective efficiency is high enough we found a sensitive dependence of the stability properties of the g-modes on the pulsational treatment of shear within the convection zone.Comment: 13 pages, postscript figures included in text, uuencoded gzipped ps-file. Submitted for publication in Astron.&Astrophy

Authority with the Force of Law: Statutory Interpretation as Policymaking in Gonzales v. Oregon

The Oregon Death with Dignity Act was enacted in 1994 by the State of Oregon to allow physicians to aid terminally ill patients who wished to end their lives in a controlled manner. In 2001, Attorney General John Ashcroft issued an Interpretive Rule stating that prescribing a controlled substance for the purpose of physician-assisted suicide would not qualify as a requisite legitimate medical purpose under the federal Controlled Substances Act, and that any physician who prescribed a controlled substance for the purpose of ending a patient\u27s life faced deregistration. In Gonzales v. Oregon, the Supreme Court of the United States ruled that the Attorney General\u27s Interpretive Rule was invalid because it was outside of the scope of his authority delegated by Congress. Because the issue of physician-assisted suicide is one that generates so much controversy, this case has received a large amount of publicity and comment from many spheres of public life. However, neither the Court nor the dissent spent much time discussing the issue of physician-assisted suicide, and instead, both of the opinions based their arguments in the framework of administrative law. Within this structure, two competing jurisprudential philosophies collide; as a result, Gonzales v. Oregon offers insight into how such disputes will be debated and resolved in the foreseeable future. This note examines the Court\u27s decision, the accompanying jurisprudential doctrines, and the potential ramifications of both this ruling and Justice Scalia\u27s dissent in light of an ongoing debate regarding physician-assisted suicide and the scope of agency rulemaking authority

Special Statutes of Limitation and the Servicemembers Civil Relief Act: Case Closed

The Servicemembers Civil Relief Act (SCRA) was enacted by Congress to provide for the temporary suspension of judicial and administrative proceedings and transactions that may adversely affect the civil rights of servicemembers during their military service. To this end, the SCRA prevents any period of military service from being included in computing any period limited by law, regulation, or order . . . by or against the servicemember or the servicemember\u27s heirs, executors, administrators, or assigns. In State ex rel. Estate of Perry v. Roper, the Court of Appeals for the Western District of Missouri applied the SCRA to prevent the application of a special statute of limitations contained in Missouri\u27s Probate Code. This note examines the court\u27s decision and the policy implications thereof in light of the history of the SCRA and Missouri Revised Statutes section 473.050, the statute of limitations on presentment of wills under Missouri law

Zwei markante Stauchmoränen: Peski/Belorussland und Jasmund, Ostseeinsel Rügen/Nordostdeutschland - Gemeinsame Merkmale und Unterschiede

Strukturen, Architektur und Genese der Stauchmoräne Peski/ Belorussland werden beschrieben und mit der Stauchmoräne Jasmund/Rügen verglichen. In beiden Stauchmoränen sind Oberkreide- und Pleistozänfolgen, bei Peski zusätzlich tertiäre Sande, glazigen gefaltet und verschuppt worden. Die Falten und Schuppen gleichen sich in beiden Stauchzonen in den Formen und Ausmaßen weitgehend. In ihrer Architektur unterscheiden sich beide Großstrukturen jedoch prinzipiell voneinander: Bei Peski ist eine bogenförmige Stauchzone an der Stirn eines ausgedehnten Eislobus entstanden; auf Jasmund ist der Eisstrom, der der Ostseesenke gefolgt war, durch ein höher liegendes Areal zweigeteilt worden und hat dieses samt den ersten Stauchwällen zunächst umflossen. Hier ist die Stauchung von den Flanken zweier Eiszungen ausgegangen. Der Interpretation als einer spitzwinkligen Kerbstauchung wird die Vorstellung einer in der Anlage schlingenförmig gerafften Stauchung gegenübergestellt, die später vom Eis überprägt worden ist. Die Lagebeziehungen beider Stauchmoränen zu den Bruchstrukturen im präquartären Untergrund der Region und zu deren neotektonischen Mobilität werden diskutiert. Die glazigene Stauchung bei Peski wird dem Sosch-(Warthe-)eis zugeschrieben, die auf Jasmund der Weichselvereisung. Beide Stauchungen sind nach dem Höhepunkt einer Vereisung, nach der maximalen Eisausbreitung, erfolgt. Diese rückläufigen Kälteperioden boten besonders günstige Voraussetzungen für Einwirkungen des Inlandeises auf den Untergrund.researc

A mean field approximation for hopping transport in disordered materials

By a mean field aproximation a macroscopic charge transport equation is derived from a hopping model with long range interaction. The transport coefficients are calculated from microscopic hopping characteristics of the disordered medium

Computationally accelerated experimental materials characterization -- drawing inspiration from high-throughput simulation workflows

Computational materials science is increasingly benefitting from data management, automation, and algorithm-based decision-making in controlling simulations. Experimental materials science is also undergoing a change and increasingly more `machine learning' is incorporated in materials discovery campaigns. The obvious benefits include automation, reproducibility, data provenance, and reusability of managed data, however, is not widely available. We demonstrate an implementation of a Gaussian Process Regression directly controlling an experimental measurement device in pyiron, a framework designed for high-throughput simulations, as a first step to increasingly combine experimental and simulated data in one framework. With data from both in the same framework, a heretofore untapped and much-needed potential for the acceleration of materials characterization and materials discovery campaigns becomes available.Comment: 17 pages, 4 figures, preprin