The bicycle: a land survey medium

At the end of the 19th century, the bicycle was a medium of land development, connection, sensing and routing. This article explores these features of the bicycle based on the League of American Wheelmen bulletins that were published between 1880 and 1902. The enquiry shows that the bicycle constitutes a rural geomedium since the first cyclists regarded themselves as land surveyors. Furthermore, the bicycle, as a vehicle that is connected to an individual, links the starting and end points of a route – without stops on the way and without changing vehicles. This continuity of movement is a highly essential property of the medium ‘bicycle’. Being awheel and making the countryside accessible cartographically are therefore closely linked to each other; they take place in one and the same procedure as part of the joint practice of land surveys. During this process, the bicycle proves to be an ideal instrument for the sensing of road surface conditions and therefore functions as a mediator between the road and the cyclist. It also serves as a mediator between urban and rural areas and as a connected device: The bicycle is the condition for cooperation for Bicycle Clubs, which enjoyed enormous popularity at the end of the 19th century. It facilitated the cooperative experiencing and exploring of the land that had yet not been documented cartographically and, in turn, yielded its own new form of representation: navigable maps in the form of route guides.At the end of the 19th century, the bicycle was a medium of land development, connection, sensing and routing. This article explores these features of the bicycle based on the League of American Wheelmen bulletins that were published between 1880 and 1902. The enquiry shows that the bicycle constitutes a rural geomedium since the first cyclists regarded themselves as land surveyors. Furthermore, the bicycle, as a vehicle that is connected to an individual, links the starting and end points of a route – without stops on the way and without changing vehicles. This continuity of movement is a highly essential property of the medium ‘bicycle’. Being awheel and making the countryside accessible cartographically are therefore closely linked to each other; they take place in one and the same procedure as part of the joint practice of land surveys. During this process, the bicycle proves to be an ideal instrument for the sensing of road surface conditions and therefore functions as a mediator between the road and the cyclist. It also serves as a mediator between urban and rural areas and as a connected device: The bicycle is the condition for cooperation for Bicycle Clubs, which enjoyed enormous popularity at the end of the 19th century. It facilitated the cooperative experiencing and exploring of the land that had yet not been documented cartographically and, in turn, yielded its own new form of representation: navigable maps in the form of route guides

Navigieren

Prof. Dr. Jens Schröter, Christoph Borbach, Max Kanderske und Prof. Dr. Benjamin Beil sind Herausgeber der Reihe. Die Herausgeber*innen der einzelnen Hefte sind renommierte Wissenschaftler*innen aus dem In- und Ausland.Navigieren ist längst kein Unikum professionalisierter Seefahrer:innen mehr, sondern als Smartphone- und Browser-Praktik fester Bestandteil des vernetzten digitalen Alltags. Da Wegfindungen durch On- und Offline-Räume navigationsspezifische Formen von Medienkompetenz voraussetzen und hervorbringen, fordern sie die Intensivierung der medienkulturwissenschaftlichen Beschäftigung mit den situierten und technisierten Medienpraktiken der Navigation geradezu heraus. Die Ausgabe nimmt diesen Befund zum Anlass, polyperspektivische Zugänge zum »Navigieren« vorzustellen. Die körper-, kultur- und medientechnischen Facetten des Navigierens stehen dabei ebenso im Fokus wie ihre historischen Ausgestaltungen, die Arbeit am und im Datenmaterial von Navigationsmedien und die Theoretisierung postdigitaler Sensor-Medien-Kulturen, die dem Umstand Rechnung trägt, dass es nicht allein Daten, Dinge und Körper sind, die es zu navigieren gilt, sondern zunehmend nicht-menschliche Akteure selbst zielgerichtete Raumdurchquerungen praktizieren. Fehlte es in der (deutschsprachigen) Medienkulturwissenschaft bislang an einer Bündelung heterogener navigationsspezifischer Forschungsarbeiten, gibt diese Ausgabe einen Überblick über das Feld, seine Forscher:innen und Fragestellungen. Denn trotz des Spatial Turns in den Humanities und der gegenwärtigen Konjunktur geomedialer Arbeiten, scheint die synthetisierende Fokussierung auf Medien und Praktiken des Navigierens in historischer, ethnografischer, technischer und theoretischer Perspektive bislang ein Desiderat darzustellen.Navigation is no longer unique to the context of professional seafaring, but has become an integral part of networked digital everyday life enabled through smartphones and web browsers. Indeed, finding one’s way through online and offline spaces increasingly presupposes and produces specific forms of media competence one could call »navigational«. In this, a ›media cultural studies‹ perspective on the situated and ›technologized‹ media practices of navigation becomes imperative to understanding the contemporary media landscape. Issue 1/22 of Navigationen answers this call by presenting polyperspectival approaches to »navigating«. The contributions discuss the bodily, cultural, and media-technical facets of navigation, as well as its historical forms, the work on and in the data produced by and with navigational media, and the theorization of post-digital ›sensor media cultures‹. In doing so, the issue acknowledges that not only do data, things, and bodies need to be ›navigated‹ in the context of logistics, but that the increasingly autonomous wayfinding processes of non-human actors change the notion of navigation itself. As (German language) media cultural studies has so far lacked a convincing compilation of heterogeneous approaches to studying navigation, this issue provides an overview of the field, its researchers and questions. Despite the spatial turn in the humanities and a recent surge in geomedia studies, an approach towards the media and practices of navigation that combines historical, ethnographic, technical and theoretical perspectives, has remained a desideratum until now. The issue fills this gap

Sensormedien : eine medien- und praxistheoretische Annäherung

Da gegenwärtig immer mehr Sensoren in Medien, Gebrauchsgegenständen und Infrastrukturen verbaut und diese so zu mobilen „Smart Devices“ transformiert werden, entstehen neue sozio-technische Bedingungen der Datenerfassung und -Verarbeitung, denen nicht mit etablierten Konzepten zur Informations- und Wissensgesellschaft begegnet werden kann. Sie zeichnen sich durch eine entgrenzte Datenerfassung aus, da wir mit Hilfe von Sensoren eine unaufhörliche Verbindung zur Umwelt eingehen. Das Konzept der Sensormedien erlaubt es daher, den Fokus darauf zu richten, was das Beständige medialer Environments ist und was unsere „digitale Gesellschaft“ zusammenhält. Die Grundidee des vorliegenden Working Papers ist, dass Sensormedien einen epistemischen Shift von der Informations- zur Sensorgesellschaft einleiten und nur in der wechselseitigen Verrechnung und Re-Sensibilisierung von Daten, Umwelten und Körpern zu verstehen sind. Sensormedien sind zudem prädestiniert für eine praxistheoretische Auseinandersetzung, da die mediale Erfassung und Darstellung der Körper-Umwelt-Beziehung durch neue Sensortechnologien ein Diversitätsniveau erreicht, welches der Komplexität praxeologischer Beschreibung besser gerecht wird. Umgekehrt lassen sich die kulturellen und gesellschaftlichen Auswirkungen der Sensormedien nur auf Grundlage methodologischer Innovationen wirklich adäquat beschreiben

Methodological Adequacy : Ein sozial-, wissenschafts- und medientheoretischer Beitrag zu Selektionspraktiken

publishe

Long term outcomes of transcatheter aortic valve implantation (TAVI): A systematic review of 5-year survival and beyond

BACKGROUND: Transcatheter aortic valve implantation/replacement (TAVI/TAVR) is becoming more frequently used to treat aortic stenosis (AS), with increasing push for the procedure in lower risk patients. Numerous randomized controlled trials have demonstrated that TAVI offers a suitable alternative to the current gold standard of surgical aortic valve replacement (SAVR) in terms of short-term outcomes. The present review evaluates long-term outcomes following TAVI procedures. METHODS: Literature search using three electronic databases was performed up to June 2017. Studies which included 20 or more patients undergoing TAVI procedures, either as a stand-alone or concomitant procedure and with a follow-up of at least 5 years, were included in the present review. Literature search and data extraction were performed by two independent researchers. Digitized survival data were extracted from Kaplan-Meier curves in order to re-create the original patient data using an iterative algorithm and subsequently aggregated for analysis. RESULTS: Thirty-one studies were included in the present analysis, with a total of 13,857 patients. Two studies were national registries, eight were multi-institutional collaborations and the remainder were institutional series. Overall, 45.7% of patients were male, with mean age of 81.5\ub17.0 years. Where reported, the mean Logistic EuroSCORE (LES) was 22.1\ub113.7 and the mean Society of Thoracic Surgeons (STS) score was 9.2\ub16.6. The pooled analysis found 30-day mortality, cerebrovascular accidents, acute kidney injury (AKI) and requirement for permanent pacemaker (PPM) implantation to be 8.4%, 2.8%, 14.4%, and 13.4%, respectively. Aggregated survival at 1-, 2-, 3-, 5- and 7-year were 83%, 75%, 65%, 48% and 28%, respectively. CONCLUSIONS: The present systematic review identified acceptable long-term survival results for TAVI procedures in an elderly population. Extended follow-up is required to assess long-term outcomes following TAVI, particularly before its application is extended into wider population groups

Coronal Heating as Determined by the Solar Flare Frequency Distribution Obtained by Aggregating Case Studies

Flare frequency distributions represent a key approach to addressing one of the largest problems in solar and stellar physics: determining the mechanism that counter-intuitively heats coronae to temperatures that are orders of magnitude hotter than the corresponding photospheres. It is widely accepted that the magnetic field is responsible for the heating, but there are two competing mechanisms that could explain it: nanoflares or Alfv\'en waves. To date, neither can be directly observed. Nanoflares are, by definition, extremely small, but their aggregate energy release could represent a substantial heating mechanism, presuming they are sufficiently abundant. One way to test this presumption is via the flare frequency distribution, which describes how often flares of various energies occur. If the slope of the power law fitting the flare frequency distribution is above a critical threshold, $\alpha=2$ as established in prior literature, then there should be a sufficient abundance of nanoflares to explain coronal heating. We performed $>$600 case studies of solar flares, made possible by an unprecedented number of data analysts via three semesters of an undergraduate physics laboratory course. This allowed us to include two crucial, but nontrivial, analysis methods: pre-flare baseline subtraction and computation of the flare energy, which requires determining flare start and stop times. We aggregated the results of these analyses into a statistical study to determine that $\alpha = 1.63 \pm 0.03$. This is below the critical threshold, suggesting that Alfv\'en waves are an important driver of coronal heating.Comment: 1,002 authors, 14 pages, 4 figures, 3 tables, published by The Astrophysical Journal on 2023-05-09, volume 948, page 7