408 research outputs found
About geometrical convergence of general iterative methods applied to nonunique solvable convex problems, Part I
AbstractGeneral conditions are given in a Hilbert space setting ensuring the geometrical convergence of a sequence (xk) to a fixed element xâ of a convex and closed subset M. A thorough discussion to improve the occurring error estimates is added.The results are applied to the approximate solution of convex problems, where M is constituted by the solution set and (xk) is generated by a corresponding general iterative method
Schwingungen als dynamische Systeme aus mathematischer Sicht
Schwingungen sind ein zentraler Gegenstand der Ingenieurausbildung. Sie spielen in allen Ingenieurdisziplinen eine wichtige Rolle. In mathematischen Lehrveranstaltungen kann man Studentenprojekte einbauen, in denen Programmsysteme zur Simulation des dynamischen Verhaltens von Schwingern entwickelt werden. Die Studenten sollen dabei auch lernen, die Korrektheit von Ergebnissen einzuschĂ€tzen. Dazu mĂŒssen sie die Fehlerquellen und ihre möglichen Auswirkungen kennen
Positionen zur Mathematikausbildung von Ingenieuren
In den vom Gottlob-Frege-Zentrum initiierten Workshops Mathematik fĂŒr Ingenieure werden regelmĂ€Ăig Ideen und Erfahrungen zur StĂ€rkung und Modernisierung der Mathematikausbildung ausgetauscht. Die folgenden Positionen sind nicht neu, harren aber immer noch einer erfolgreichen Umsetzung. Sie sollen den vielfĂ€ltigen BemĂŒhungen Nachdruck verleihen und das BĂŒndnis aller Betroffenen organisieren
âEs fĂŒhrt ĂŒber den Main eine BrĂŒcke von Steinâ. Die BrĂŒcken von Frankfurt am Main im langen 19. Jahrhundert
Der Beitrag untersucht, wie die Alte BrĂŒcke in Frankfurt am Main im 19. Jahrhundert in verkehrstechnischer Hinsicht durch andere BrĂŒcken ergĂ€nzt und teilweise substituiert wurde. Beim Neubau dieser BrĂŒcke im frĂŒhen 20. Jahrhundert, der wegen der Behinderung der Schifffahrt und mangelnder LeistungsfĂ€higkeit fĂŒr den StraĂenverkehr notwendig wurde, verzichtete man auf eine Ă€uĂerlich sichtbare moderne Gestaltung und knĂŒpfte durch BrĂŒckendesign und Formensprache am historischen Vorbild an. Die groĂ dimensionierte BrĂŒckenweihe 1926 nutzte die Stadt Frankfurt, um ihre reichsweite Bedeutung und ihren Anspruch als âVerkehrsstadtâ zum Ausdruck zu bringen.âA stone bridge leads across the Mainâ: Bridges in Frankfurt am Main in the long 19th centuryThe article analyzes how, from the point of view of road traffic organization, the Old Bridge in Frankfurt am Main was completed and in the 19th c. partly replaced by other bridges. During the reconstruction of this bridge in the early 20th century, necessary due to ship traffic jams and inefficiencies of urban traffic, modern design was abandoned for the style and form of the bridge referring to the historical prototype. The grand opening of the bridge in 1926 was used by Frankfurt to emphasize the cityâs importance and its claims for the role of a communication centre. Translated by Anna MaleszkaâPrzez Men prowadzi most z kamieniaâ. Mosty we Frankfurcie nad Menem w dĆugim XIX wiekuW artykule przeanalizowano, w jaki sposĂłb z punktu widzenia organizacji ruchu drogowego Stary Most we Frankfurcie nad Menem zostaĆ uzupeĆniony i czÄĆciowo zastÄ
piony w XIX wieku innymi mostami. Podczas przebudowy tego mostu na poczÄ
tku XX wieku, koniecznej z powodu utrudnieĆ w ruchu statkĂłw oraz maĆej wydajnoĆci w ruchu drogowym, zrezygnowano z wyraĆșnie nowoczesnego projektu i nawiÄ
zano poprzez stylistykÄ oraz formÄ mostu do historycznego pierwowzoru. Przeprowadzone z rozmachem uroczyste otwarcie mostu w 1926 roku zostaĆo przez Frankfurt wykorzystane do podkreĆlenia paĆstwowego znaczenia tego miasta i jego roszczeĆ do roli centrum komunikacyjnego. TĆumaczenie Renata SkowroĆsk
Moderne Mathematikausbildung fĂŒr Ingeneure
Wir brauchen gut ausgebildete und flexibel einsetzbare Ingenieure, um die KonkurrenzfĂ€higkeit unserer Region zu sichern. Eine fundierte und moderne Mathematikausbildung fĂŒr Ingenieure ist daher unverzichtbar. Da die mathematischen Vorkenntnisse der StudienanfĂ€nger schlecht sind und tendenziell weiter sinken, mĂŒssen wir uns Gedanken sowohl zur Verbesserung der Vorkenntnisse als auch zur weiteren Qualifizierung der Mathematikausbildung durch Einsatz neuer Lehrformen und neuer Hilfsmittel machen. Die VortrĂ€ge des Minisymposiums stellen einen guten Querschnitt zu dieser Problematik dar. Sie knĂŒpfen an das an, was im norddeutschen Raum in den Workshops "Mathematik fĂŒr Ingenieure" seit dem Jahre 2000 diskutiert und ausgewertet wird. Da die Probleme in ganz Deutschland und Europa Ă€hnlich sind, gibt es von Anfang an BemĂŒhungen, den Erfahrungsaustausch mit anderen Zentren zu vernetzen. Das Gottlob-Frege-Zentrum der Hochschule Wismar ist Sattelite Centre of UICEE (siehe Literatur). Das Minisymposium stellt ein wichtiges Bindeglied auf diesem Wege dar. Die Organisatoren werden auch auf kĂŒnftigen Jahrestagungen eine moderne Mathematikausbildung fĂŒr Ingenieure propagieren
Conflicts of interest in medicine and their management: current challenges and initiatives in Germany
Conflicts of interest (COI) in healthcare have increasingly gained attention in the lay press as well as among healthcare professionals. COIs increase the risk of undue influence on professional decision making and may have far-reaching consequences in healthcare. Therefore, it is essential to develop strategies to deal with such risk situations in order to prevent negative outcomes for patients and the health care system. This article describes recent research on COIs in Germany as well as initiatives aiming at more transparency and better management of COIs in Germany
Quantification of large and middle proteins of hepatitis B virus surface antigen (HBsAg) as a novel tool for the identification of inactive HBV carriers
Objective Among individuals with chronic hepatitis B, those with hepatitis B e-antigen (HBeAg)-negative chronic hepatitis (CHB) can be difficult to distinguish from those with HBeAg-negative chronic HBV infection, also referred to as inactive HBV carriers (ICs), but both require different medical management. The level of HBV surface antigen (HBsAg) has been proposed as a marker to discriminate between chronic infection and hepatitis stages. HBsAg consists of large, middle and small HBs. The aim of this study was to determine whether the composition of HBsAg improved the identification of ICs among HBsAg-positive subjects with different phases of HBV infections. Design HBV large surface proteins (LHBs) and HBV middle surface proteins (MHBs) were quantified in serum samples from 183 clinically well-characterised untreated patients with acute (n=14) HBV infection, ICs (n=44), CHBs (n=46), chronic HBeAg-positive phase (n=68) and hepatitis delta coinfection (n=11) using an ELISA, with well-defined monoclonal antibodies against the preS1 domain (LHBs) and the preS2-domain (MHBs). A Western blot analysis was used to verify the quantitation of the components of HBsAg. Total HBsAg was quantified using a modified commercially available assay (HBsAg V. 6.0, Enzygnost, Siemens, Erlangen). Results The composition of HBsAg showed specific patterns across different phases of hepatitis B. Individuals in the IC phase had significantly lower proportions of LHBs and MHBs than patients in acute or chronic phases irrespective of their HBV e-antigen status (p< 0.0001) or HBsAg level. Both LHBs and MHBs ratios better predicted the IC phase than total HBsAg levels. Conclusion Quantification of MHBs, particularly LHBs represents a novel tool for the identification of the IC stage
Global Standards in Action: Insights from Anti-Money Laundering Regulation
As organizations have come under the increasing influence of global rules of all sorts, organization scholars have started studying the dynamics of global regulation. The purpose of this article is to identify and evaluate the contribution to this interdisciplinary field by the âStockholm Centre for Organisational Researchâ. The latterâs key proposition is that while global regulation often consists of voluntary best practice rules it can nevertheless become highly influential under certain conditions. We assess how innovative this approach is using as a benchmark the state of the art in another field of relevance to the study of global regulation, i.e. âInternational Relationsâ. Our discussion is primarily theoretical but we draw on the case of global anti-money laundering regulation to illustrate our arguments and for inspirations of how to further elaborate the approach
Field-free deterministic ultra fast creation of skyrmions by spin orbit torques
Magnetic skyrmions are currently the most promising option to realize
current-driven magnetic shift registers. A variety of concepts to create
skyrmions were proposed and demonstrated. However, none of the reported
experiments show controlled creation of single skyrmions using integrated
designs. Here, we demonstrate that skyrmions can be generated deterministically
on subnanosecond timescales in magnetic racetracks at artificial or natural
defects using spin orbit torque (SOT) pulses. The mechanism is largely similar
to SOT-induced switching of uniformly magnetized elements, but due to the
effect of the Dzyaloshinskii-Moriya interaction (DMI), external fields are not
required. Our observations provide a simple and reliable means for skyrmion
writing that can be readily integrated into racetrack devices
Consensus recommendations of the german consortium for hereditary breast and ovarian cancer
BACKGROUND: The German Consortium for Hereditary Breast and Ovarian Cancer (GC-HBOC) has established a multigene panel (TruRiskÂź) for the analysis of risk genes for familial breast and ovarian cancer. SUMMARY: An interdisciplinary team of experts from the GC-HBOC has evaluated the available data on risk modification in the presence of pathogenic mutations in these genes based on a structured literature search and through a formal consensus process. KEY MESSAGES: The goal of this work is to better assess individual disease risk and, on this basis, to derive clinical recommendations for patient counseling and care at the centers of the GC-HBOC from the initial consultation prior to genetic testing to the use of individual risk-adapted preventive/therapeutic measures
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