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Physik

00:40

Microwave beam broadening due to turbulent plasma density fluctuations

Microwaves are widely used in fusion-relevant experiments for heating and diagnostic purposes. They suffer, however, from the problem that they have to traverse the plasma boundary, a region where substantial plasma density fluctuations are known to occur. This can significantly distort the beam and thus reduce heating efficiencies which rely on good localization of the injected microwaves (e.g. stabilization of neoclassical tearing modes). Geometrical-optics tools cannot be used to describe the interaction of the small-scale plasma density turbulence and the microwave. Instead, full-wave codes can be used which do not rely on any simplifying assumptions concerning the density variations. Here, we present a full-wave simulation (using the FDTD code IPF-FDMC) of a microwave beam with a frequency of 50 GHz injected onto a plasma with a linearly increasing background density (colour-coded in the video). A layer of turbulent plasma density has been added to, as can be seen from the video. Plotted is also the time-evolution of the absolute value of the wave electric field (the microwave is injected from the right-hand side).
  • Erscheinungsjahr: 2018
  • Herausgeber: University of Stuttgart
  • Sprache:

Mathematik

20:20

Conference recordings complement scholarly research communication in traditional conference proceedings

Traditionally, research results presented at scientific conferences are published in conference proceedings. Additionally, an increasing number of conferences are recorded and the videos are subsequently published. In most cases these videos are published by the organisers on commercial platforms or directly on the conference website. Therefore, a systematic search for conference recordings is difficult. Moreover, the videos are often lost after a short time e.g. because the URL changes or external links lead to nowhere. Usually, conference websites are not maintained on a long-term basis and commercial platforms may remove videos or change the conditions for access for a variety of reasons. Finally, to ensure an unproblematic re-use of the material questions of licencing, technical quality and formats have to be solved in advance. In order to prevent the loss of conference recordings the German National Library of Science and Technology (TIB) has developed the AV-Portal. The AV-Portal provides the ideal infrastructure to host, find and reuse scientific videos. It's a single access point for videos from different conferences and years. All videos are assigned a Digital Object Identifier (DOI). These persistent identifiers allow for reliable referencing both as stable online links and as correct citations in scholarly work. In this talk we describe how sharing scientific results via audio-visual media has become an important part of scientific communication and how conference recordings may complement the classical conference proceedings and add new value to the presented research. By discussing the whole process from pre-conference organisation to publishing and archiving the recordings we show pitfalls, best practices and opportunities of recordings for both conference organisers and participants.
  • Erscheinungsjahr: 2018
  • Herausgeber: Weierstraß-Institut für Angewandte Analysis und Stochastik (WIAS), Technische Informationsbibliothek (TIB)
  • Sprache:

Informatik

16:56

Einführung in Git(Hub/Lab): Wieso, weshalb, warum Versionskontrolle? Und wie?

  • Erscheinungsjahr: 2018
  • Herausgeber: Technische Informationsbibliothek (TIB)
  • Sprache:

Technik

14:54

Nutzung des Rauheitsmessgerätes Hommel-Etamatic W10 der Firma Jenoptic

Zwei Studierende des Masterstudienganges Lehramt an berufsbildenden Schulen für Ingenieure (Sprint-ING) haben im Rahmen einer Studienarbeit das vorliegende Erklärvideo erstellt (Held und Hasselmann 2018). Das Video erklärt die Nutzung des portablen Rauheitsmessgerätes „Hommel-Etamic W10“ der Firma Jenoptic und ermöglicht eine digital unterstützte Lehr- und Lernkonzepte (z.B. Blended Learning).
  • Erscheinungsjahr: 2019
  • Herausgeber: Leibniz Universität Hannover (LUH), Institut für Berufswissenschaften der Metalltechnik (IBM), Zentrum der Didaktik der Technik (ZDT)
  • Sprache:

Chemie

00:27

Movie S1

The microstructure of polycrystalline ice with a threading solution of brine controls its numerous characteristics, including the ice mechanical properties, ice-atmosphere interactions, sea-ice albedo, and (photo)chemical behavior in/on the ice. Ice samples were previously prepared in laboratories to study various facets of ice-impurities interactions and (photo)reactions to model natural ice-impurities behavior. We examine the impact of the freezing conditions and solute (CsCl used as a proxy for naturally occurring salts) concentrations on the microscopic structure of ice samples via an environmental scanning electron microscope. The method allows us to observe in detail the ice surfaces, namely, the free ice, brine puddles, brine-containing grain boundary grooves, individual ice crystals, and imprints left by entrapped air bubbles at temperatures higher than -25°C. The amount of brine on the external surface is found proportional to the solute concentration and is strongly dependent on the sample preparation method. Time-lapse images in the condition of slight sublimation reveal sub-surface association of air bubbles with brine. With rising temperature (up to – 14 °C), the brine surface coverage increases to remain enhanced during the subsequent cooling and until the final crystallization below the eutectic temperature. The ice recrystallization dynamics identifies the role of surface spikes in retarding the ice boundaries propagation (Zeener pining). The findings thus quantify the amounts of brine exposed to incoming radiation, available for the gas exchange, and influencing other mechanical and optical properties of ice. The results have straightforward implications for artificially prepared and naturally occurring salty ices.
  • Erscheinungsjahr: 2019
  • Herausgeber: Copernicus Publications
  • Sprache:

Architektur

1:00:08

Tomorrowland

  • Erscheinungsjahr: 2018
  • Herausgeber: Eidgenössische Technische Hochschule (ETH) Zürich
  • Sprache:

Biowissenschaften / Biologie

01:11

FIB-SEM video of two strongly encrusted cable bacteria

FIB-SEM video composed of 501 electron backscatter images. After each image a section of 10 nm was removed and a new section was imaged. The video shows two filaments with a horizontal cross-sectional view along the length of the filament that can be seen on the right at the start of the video. The filament that is visible on the left at the start of the video follows a different direction and therefore the cross-section shows different angles. The thick layer of mineral encrustation appears as a dark seal around the filament, the ridge compartments and the cell content appear white. The encrustation is only found around the filament and not within the periplasmic space. Both filaments are strongly encrusted and the mineral crust of both filaments is partly cemented together which can be observed from 0:06 till 0:26. The encrustation is heterogeneous with an average thickness of ˜500 nm.
  • Erscheinungsjahr: 2018
  • Herausgeber: Copernicus Publications
  • Sprache:

Umweltwissenschaften / Ökologie

43:13

Analyzing Mid-Latitude and Arctic Cirrus Clouds by means of large-scale simulations with the Lagrangian model CLaMs-Ice

  • Erscheinungsjahr: 2018
  • Herausgeber: Eidgenössische Technische Hochschule (ETH) Zürich
  • Sprache:

Geowissenschaften / Geographie

01:02

Simulation of the 1958 Lituya Bay mega-tsunami

TS2The 1958 Lituya Bay landslide-generated mega-tsunami is simulated using the Landslide-HySEA model, a recently developed finite-volume Savage–Hutter shallow water coupled numerical model. Two factors are cru- 5 cial if the main objective of the numerical simulation is to reproduce the maximal run-up with an accurate simulation of the inundated area and a precise recreation of the known trimline of the 1958 mega-tsunami of Lituya Bay: first, the accurate reconstruction of the initial slide and then the choice 10 of a suitable coupled landslide–fluid model able to reproduce how the energy released by the landslide is transmitted to the water and then propagated. Given the numerical model, the choice of parameters appears to be a point of major importance, which leads us to perform a sensitivity analysis. 15 Based on public domain topo-bathymetric data, and on information extracted from the work of Miller (1960), an approximation of Gilbert Inlet topo-bathymetry was set up and used for the numerical simulation of the mega-event. Once optimal model parameters were set, comparisons with ob20 servational data were performed in order to validate the numerical results. In the present work, we demonstrate that a shallow water type of model is able to accurately reproduce such an extreme event as the Lituya Bay mega-tsunami. The resulting numerical simulation is one of the first successful 25 attempts (if not the first) at numerically reproducing, in detail, the main features of this event in a realistic 3-D basin geometry, where no smoothing or other stabilizing factors in the bathymetric data are applied.
  • Erscheinungsjahr: 2019
  • Herausgeber: Copernicus Publications
  • Sprache:

Wirtschafts- und Sozialwissenschaft

25:56

Academic Leadership Development

  • Erscheinungsjahr: 2018
  • Herausgeber: Technische Informationsbibliothek (TIB)
  • Sprache:

Ethnologie

06:01

Lên đồng performed for tourists

  • Erscheinungsjahr: 2013
  • Herausgeber: Georg-August-Universität Göttingen, Institut für Ethnologie und Ethnologische Sammlung
  • Sprache:

Medizin

22:41

Skelettmuskel

Die DVD besteht aus den Filmen C 1245 "Aufbau und Funktion des Skelettmuskels" und C 1253 "Präparation einer einzelnen Skelettmuskelzelle".
  • Erscheinungsjahr: 2005
  • Herausgeber: IWF (Göttingen)
  • Sprache:

Information und Dokumentation

1:11:37

Principles of Information Seeking and Retrieval

This is a lecture about the principles of information seeking and retrieval. This lecture was held into the ESSIS 2018 (European Summer School of Information Science) under the EINFOSE european project funded by Erasmus+
  • Erscheinungsjahr: 2018
  • Herausgeber: Boté, Juan-José
  • Sprache:

Psychologie

04:35

SFX Optionen bei der Suche nach Büchern in PSYNDEX Direct

PSYNDEX Direct verzeichnet mehr als 70.000 Bücher, Sammelbände und Beiträge in Büchern. In dem Tutorial 'SFX Optionen bei der Suche nach Büchern in PSYNDEX Direct' wird demonstriert, welche Möglichkeiten es gibt, ausgehend von einem Suchtreffer in PSYNDEX Direct zu einer Bibliothek zu gelangen, die das gesuchte Buch in ihrem Bestand hat.
  • Erscheinungsjahr: 2008
  • Herausgeber: Leibniz Institute for Psychology Information
  • Sprache:

Geschichte

1:07:49

The Waried Transport Company - A Chapter from the History of German Technology

In the 1930s, the director of the Waried shipping company took a film camera with him on his travels. It was the era of the Great Depression - and it was also the early days of the National Socialist dictatorship in Germany. Amateur filmmaker Adolf Schneider took movies of ship christenings and launchings, their concomitant celebrations and sea trials. But he also filmed vacation trips and family outings. The movies he made render a portrait of an age and a society in transition, a society heading for a catastrophe of unimaginable proportions about which it obviously had no premonition whatever.
  • Erscheinungsjahr: 2009
  • Herausgeber: IWF (Göttingen), ZKM (Karlsruhe)
  • Sprache:

Sport

58:25

"Das war gar nicht so einfach" - Fritz Gödicke und der Fußball in der DDR

In einem mit zahlreichen Fotos illustrierten Interview erzählt der 85jährige Fritz Gödicke als Zeitzeuge von seinem Leben als Fußballspieler, Trainer und Sportfunktionär. Gödicke erlebte an verantwortlicher Stelle ab 1945 die Entwicklung des Sports in der DDR, insbesondere des Fußballs, ehe er sich 1985 ins Privatleben zurückzog. Seine Erinnerungen umfassen den Aufbau wichtiger DDR-Sportorganisationen und das Bemühen um ihre internationale Anerkennung in den 50er Jahren sowie die Entwicklung des DDR-Fußballs im gesamtdeutschen und internationalen Vergleich.
  • Erscheinungsjahr: 2007
  • Herausgeber: IWF (Göttingen)
  • Sprache:

Kunst und Medien

1:02:54

CELAN - Musiktheater in sieben Entwürfen (Teil 1)

Nach einer langen, intensiven Auseinandersetzung des Komponisten Peter Ruzicka mit Leben und Werk des jüdischen Dichters Paul Celan (1920 - 1970) entstand die Oper CELAN, die in der Dresdener Semperoper 2001 uraufgeführt wurde. Die Oper zeichnet die komplexe Metaphernwelt Celans sowie dessen tragisches Leben musikalisch nach. Die IWF konnte eine Vorstellung am 2. März 2002 in Dresden aufzeichnen, die hier in voller Länge in zwei Teilen präsentiert wird.
  • Erscheinungsjahr: 2007
  • Herausgeber: IWF (Göttingen)
  • Sprache:

Sonstige

01:31

TIB in 90 seconds

  • Erscheinungsjahr: 2018
  • Herausgeber: Technische Informationsbibliothek (TIB)
  • Sprache:

Das TIB AV-Portal bietet einen Zugang zu qualitätsgeprüften wissenschaftlichen Filmen aus Technik sowie Architektur, Chemie, Informatik, Mathematik und Physik.

Suchen

Innovative Such- und Analysewerkzeuge unterstützen Sie bei der Recherche.

Zitieren

Mit einem Digital Object Identifier (DOI) zitieren Sie wissenschaftliche Filme und Filmsegmente so einfach wie Texte.

Hochladen

Über das TIB AV-Portal machen Sie Ihre Videos und Begleitmaterialien für Bildung und Forschung nachhaltig nutzbar.

Artikel im TIB Blog

12.02.2019, Bastian Drees
Manfred Eigen (1927 – 2019)
Am 6. Februar verstarb der Chemie-Nobelpreisträger Manfred Eigen im Alter von 91 Jahren. Er begründete gleich zwei große wissenschaftliche Schulen, war ein begabter Musiker und begeisterter Skifahrer.
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27.10.2018, Bastian Drees
„Ich genieße die Fiestas und taste mich in Richtung filmische Dokumentation vor“
Ein Dorf in Mexiko und die Heilige Woche, ein Autounfall mit Fahrerflucht und ein Tequila trinkender Polizeichef und mittendrin ein Filmteam aus Göttingen. Sechs Aktenordner und viele Meter Filmmaterial erzählen die abenteuerliche Geschichte einer Mexikoexpedition vor 30 Jahren, und mit der „Bergung“ eines Ethnologischen Filmschatzes den vorläufigen Ausgang der Geschichte im Jahre 2018. Ein Beitrag zum Welttag des audiovisuellen Erbes 2018.
weiterlesen im TIB Blog ...
27.10.2018, Bastian Drees
“I’m enjoying the fiestas and gradually working towards a film documentary”
A village in Mexico and Holy Week, a hit-and-run car accident, and a tequila-drinking police chief – and a film team from Göttingen at the heart of it all. Six binder files and reels and reels of film material tell the adventure of an expedition to Mexico 30 years ago. With the “unearthing” of an ethnological film treasure, the preliminary end of the tale can be told in 2018. A contribution to the 2018 World Day for Audiovisual Heritage.
weiterlesen im TIB Blog ...
10.04.2018, Bastian Drees
New York, Rio, Bengaluru – The AV-Portal is turning 4 years old
The AV-Portal celebrates its 4th birthday! Today, more than 1,000 visitors from all over the world watch one or more of 14,000 scientific videos every day.
weiterlesen im TIB Blog ...
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