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08:56 Leibniz Universität Hannover (LUH) German 2012

Raum-Zeit-Forschung

  • Published: 2012
  • Publisher: Leibniz Universität Hannover (LUH)
  • Language: German
08:12 IWF (Göttingen) German 1978

Einstufige Schubzentrifuge - Trennung von Feststoff und Flüssigkeit unter verschiedenen Betriebsbedingungen

Beim Zentrifugieren einer Suspension werden Kuchenbildung und Transport unter Variation der Trommellänge, Drehzahl, Schubfrequenz und Vorschublänge mit stroboskopischen Filmaufnahmen gezeigt.
  • Published: 1978
  • Publisher: IWF (Göttingen)
  • Language: German
06:36 IWF (Göttingen) German 1978

Einstufige Schubzentrifuge - Gestörte Trennung von Feststoff und Flüssigkeit unter verschiedenen Betriebsbedingungen

A homogeneous distribution of the solid cake in the barrel will be prevented by an unsteady and poorly adapted supply of suspension to the running conditions. Shown will be the following particularities at the formation and the transport of the cake: the obstucted starting process, the disturbed areas in the form of a channel caused by four bolts of a distance cage, flooding an spitting. By means of synchronization device and a stroboscopical lighting the rotation barrel of the centrifuge apparently comes to a standstill.
  • Published: 1978
  • Publisher: IWF (Göttingen)
  • Language: German
04:10 IWF (Göttingen) German 1978

Einstufige Schubzentrifuge - Kuchenkalibrierung beim Trennen von Feststoff und Flüssigkeit unter verschiedenen Betriebsbedingungen

The calibration of a solid cake will be shown in a single stage pusher centrifuge at starting and under variation of the mass flow of the suspension, the frequency of the pusher and the number of revolutions. By means of a synchronization device and stroboscopical lighting the rotating barrel of the centrifuge apparently comes to a standstill.
  • Published: 1978
  • Publisher: IWF (Göttingen)
  • Language: German
13:34 IWF (Göttingen) German 1979

Zweistufige Schubzentrifuge - Trennung von Feststoff und Flüssigkeit unter verschiedenen Betriebsbedingungen

During the mechanical separation of a liquid in a two-stage pusher centrifuge the starting process, the formation and the transport of a solid cake will be shown with the variations of the mass flow of the suspension, the number of revolutions, the frequency of the pusher plate and the length of the conveyance. By means of a synchronization device and a stroboscopical lighting the rotating barrels of the centrifuge apparently come to a standstill.
  • Published: 1979
  • Publisher: IWF (Göttingen)
  • Language: German
09:06 Bundesanstalt für Wasserbau (BAW) German 2014

Tracerversuche zur Erkundung der Grundwasserströmung an der Neckar-Staustufe Hessigheim

Um die Schifffahrt auf dem Neckar zukunftsfähig zu machen, soll die Schleuse Hessigheim in den kommenden Jahren modernisiert und nach dem Stand der Technik neu ausgerüstet werden. Aufgrund des inhomogenen Baugrundes im Bereich der Schleuse sind hierzu umfangreiche Voruntersuchungen notwendig. Zur Erkundung der Grundwasserströmungsverhältnisse wurden von der Bundesanstalt für Wasserbau (BAW) in Zusammenarbeit mit dem Karlsruher Institut für Technologie (KIT) sogenannte Tracerversuche durchgeführt.
  • Published: 2014
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: German
11:38 Bundesanstalt für Wasserbau (BAW) German 2013

Beratung beim Neubau von Wasserbauwerken

Der Schwerpunkt des Films zeigt die Arbeit des Referats "Baustoffe" der Abteilung Bautechnik in der BAW. Viele Wasserbauwerke sind bereits über hundert Jahre alt und lassen sich nicht mehr instand setzen. Sie müssen deshalb nach und nach durch Neubauten ersetzt werden.
  • Published: 2013
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: German
06:26 Bundesanstalt für Wasserbau (BAW) No linguistic content; Not applicable 2014

100 Jahre Edertalsperre

Die Edertalsperre lässt wie kaum ein anderes großes Wasserbauwerk Höhen und Tiefen deutscher Geschichte des 20. Jahrhunderts erkennbar werden. Dieses Video dokumentiert technische Meisterleistung, Bombenterror, Zwangsarbeitereinsatz und Wiederaufbau im Rahmen der hundertjährigen Geschichte dieses imposanten Bauwerks.
  • Published: 2014
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: No linguistic content; Not applicable
08:52 Leibniz Universität Hannover (LUH) English 2012

Space-Time Research

  • Published: 2012
  • Publisher: Leibniz Universität Hannover (LUH)
  • Language: English
03:55 IWF (Göttingen) Silent film 1972

Kristallumwandlung - Temperaturgesteuerte Strukturveränderung in Vanadiumdioxid-Einkristallen

At a critical temperature of 65,5°C, vanadium oxide crystals exhibit a structural transformation which is associated with a semiconductor-to-metal transition. The double-refractive, low-temperature phase is split up into differently oriented domains which can be rendered visible under a polarization microscope. Filmed through such a microscope, the film shows the transitions between semiconducting and metallic phases of vanadium oxide monocrystal needles. The transformations are caused by the external application of heat or by current flow with defined angles resulting between the domain walls and the crystal axes. In the case of current passing through the crystals there are, in addition, domain migrations which are due to the Peltier Effect and depend upon the direction of the current flow.
  • Published: 1972
  • Publisher: IWF (Göttingen)
  • Language: Silent film
08:23 IWF (Göttingen) Silent film 1970

Umwandlung des Zinns - Fortschreiten der Umwandlungsfront

Transformation of white into grey tin at experiment temperatures of approx. -25°C and reconversion at approx. +20°C. Formation of the transformation front. Demonstration of the deformations, which result during the growth of grey or white tin. Front form along one grain boundary. With time-lapse.
  • Published: 1970
  • Publisher: IWF (Göttingen)
  • Language: Silent film
10:25 IWF (Göttingen) Silent film 1972

Erstarren von Metallschmelzen - Kristallisation der Aluminium-Silizium-Legierungen AlSi 18 und AlSi 12,5

The crystallization process of aluminium-silicon alloys is observed and filmed through a high-temperature microscope. The film shows the growth of primary silicon crystals in hyper-eutectic melts under slow and rapid cooling and with doping of melt with phosphorus. The eutetic reaction which concludes solidification is also shown, and investigated further, at varying cooling rates in the subsequent sequences. Solidification of an aluminium-silicon alloy modified by sodium salts addition, whose crystallization behaviour is comparable to that of a rapidly cooled unmodified alloy, concludes the film.
  • Published: 1972
  • Publisher: IWF (Göttingen)
  • Language: Silent film
03:45 IWF (Göttingen) German 1982

Diffusion in Abhängigkeit vom Molekulargewicht am Beispiel verschiedener Farbstoffe

The dyes chrysoidin (mol. wt. 249), orange G (452), acid fuchsin (586), light green (793) diffuse through 10% gelatine columns. The diffusion velocity decreases with increasing molecular weight and continuous experimental duration (8 days at room temperature).
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: German
05:47 IWF (Göttingen) Silent film 1983

Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen

The thermal history of a crystal plays a very important part in the visual and electrical examination of alkali halides. For this reason, crystal surfaces are examined at high temperatures. During evaporation in air the fracture planes show characteristic changes. Thus, below the melting point of 770°C, various surface structures are observed. Rectangular lamella structures form within narrowly defined temperature ranges below 720°C. Between 720°C and 740°C intermediate structures occur and circular lamella structures appear between 740°C and 770°C. The observations were carried out with the aid of a phase contrast microscope. The micro-cinematographic exposures were made using time lapse photography with ratios of 3:1 to 144:1.
  • Published: 1983
  • Publisher: IWF (Göttingen)
  • Language: Silent film
07:42 IWF (Göttingen) Silent film 1967

Rostbildung auf Reineisen - Anfangsstadien

The film shows the initial stages of rust formation on a polished surface of pure iron at microscopic magnifications. The experiments were made in an atmosphere of 75 per cent relative humidity with small additions of hydrochlorid acid acting to accelerate corrosion. Using the fast motion technique it is possible to observe the individual stages of rust formation: First, corrosion points occur which, as corrosion proceeds further, grow into filament-type shapes spreading all over the iron surface. In some instances, the dependence of the direction of filament growth on the polishing direction can be observed. Also, scratches on the metal surface display a greater affinity to corrosion in some places.
  • Published: 1967
  • Publisher: IWF (Göttingen)
  • Language: Silent film
17:21 IWF (Göttingen) English 1983

Evaporation of Crystals - Evaporation of Germanium-mono-sulfide Cleavage Plane

With the interference-contrast-microscope it is possible to observe low steps which occur on a GeS-cleavage face during evaporation. The surface evaporates at locations where the crystal structure is disturbed: at the cleavage steps and at distinct dislocations. At first the cleavage steps are completely evaporated if they are not oxidized. Subsequently terraced pits are formed. Steps spread from the center of the pits over the surface homogeneously. The origins of the steps are locally fixed (at dislocations) or appear at random locations when the steps are formed by dislocation loops or by stacking faults. The shape of the pits is rhombic at low temperatures and oval at high temperatures. In addition, rectangular pits randomly appear at different locations at high temperatures. With increasing temperature stationary rhombic step patterns appear temporarily dendritic. Herringbones are formed by intersecting steps of different stationary centers. Precipitated impurities (GeS[2]) affect the spreading steps if the surface deviates from the ideal cleavage plane. Many details of the step patterns are explained by still pictures which show chemically etched examples. A ball model and an animation illustrate the relation between evaporation patterns and the crystal structure.
  • Published: 1983
  • Publisher: IWF (Göttingen)
  • Language: English
17:25 IWF (Göttingen) German 1983

Kristallverdampfung - Verdampfung der Germaniummonosulfid-Spaltfläche

Germaniummonosulfid-Verdampfung zwischen 660 und 800 K an ebenen Spaltflächen im Auflicht-Interferenzkontrast in Heizkammer mit Argon-Schutzgas. Probendicke 0,5 bis 1 mm. Mikro- und REM-Aufnahmen. Kristallgitterabbau im Modell und Zeichentrick: kovalente Bindungen, Stufen- und Schraubenversetzungen, Halbkristallagen. Verdampfungsmuster: rhombisch und dendritisch. Bildung von Grübchen und Inseln. Ausscheidung von Germaniumdisulfid.
  • Published: 1983
  • Publisher: IWF (Göttingen)
  • Language: German
37:27 Michigan State University English 1963

Liquid Helium II - The Superfluid

Demonstrates the elementary properties of the superfluid. Shows and discusses the lambda point of transition, a super leak, a bulk viscosity demonstration and a measurement of the speed of a second sound.
  • Published: 1963
  • Publisher: Michigan State University
  • Language: English
1:18:12 CityTV.nl, Foundation for Fundamental Research on Matter (FOM) English 2011

Master class I with Bart van Wees

I will give basic introduction into the physics and technology of graphene, a one atom thick hexagonal lattice of carbon atoms. Starting from the elementary electronic sp2 bonding states between adjacent carbon atoms, I will show how the two-dimensional electronic bandstructure of graphene is be obtained. The role of the Schrodinger equation is replaced by the so-called Dirac equation, which decribes a two-component wave function. This leads to very rich physics and a interesting analogy with high energy physics. From an experimental point of view I will give a demonstration of the Scotch tape technique which made it possible to obtain single graphene layers for the first time. This made it possible to observed new effects, such as the anomalous quantum Hall effect, in field effect transistors based on single graphene layers. Various techniques to improve the quality and/or the quantity of the graphene layers will be discussed, including suspended graphene and techniques to grow graphene on various substrates. Finally a future outlook will be given.
  • Published: 2011
  • Publisher: CityTV.nl, Foundation for Fundamental Research on Matter (FOM)
  • Language: English
10:51 IWF (Göttingen) English 1982

Metal Cutting of Forging Grade Steel and Nodular Iron - Cutting Process in the Microstructure; Comparison of the Materials Ck 45 V, Ck 45 N, Ck 45 BY; 49 MnVS 3 BY and GGG-60

The influence of three different thermal treatments on the machinability of steel Ck 45 and also a comparison of machinability between a microalloyed steel and nodular iron. Flow chips, shear chips, shear plane, flow zone, shear angle, chip thickness ratio, built-up edge, plastic deformation. (Microcinematography, slow-motion.)
  • Published: 1982
  • Publisher: IWF (Göttingen)
  • Language: English
09:03 IWF (Göttingen) Silent film 1957

Teilchenbewegungen in feststoffbeladenen Luftströmungen

Motion paths of quartz and lime particles which are moved by an airflow of high velocity (45 m/s, 90 m/s) in a straight pipe, blast pipe, pipe-bend. Collisional behaviour of particles with various wall materials (steel, glass, lead, rubber). Slow-motion.
  • Published: 1957
  • Publisher: IWF (Göttingen)
  • Language: Silent film
09:42 IWF (Göttingen) Silent film 1962

Schwingungsverhalten von Beton bei der Rüttelverdichtung

"Liquefaction" of stiff fresh concrete with the vibrating compactor. The vibrations transform the concrete into a viscous, thixotropic state. Movement of the material under the influence of gravity with reduced inner friction. Outer and inner vibration compactor. With slow-motion.
  • Published: 1962
  • Publisher: IWF (Göttingen)
  • Language: Silent film
03:43 IWF (Göttingen) Silent film 1976

Bruchvorgänge - Bruchgabelung in Glasscheiben unter Zugbeanspruchung (Funkenkinematographische Aufnahmen)

With growing tensile stress the bifurcations of fractures multiply and get more and more complex (dependent on the form of the nick or notch). The primary shots were done with the help of a 24 spark camera after Cranz-Schardin.
  • Published: 1976
  • Publisher: IWF (Göttingen)
  • Language: Silent film
03:08 Deutsches Zentrum für Luft- und Raumfahrt (DLR) German 2012

Der Krabbler

Der DLR-Krabbler ist ein sechsbeiniger Laufroboter, der auf Basis der Fingermodule der DLR-Hand II entwickelt wurde. Er dient als Testplattform für die Entwicklung und Beurteilung verschiedener Lauf- und Regelstrategien sowie als Vorstufe zukünftiger laufender Explorationsroboter.
  • Published: 2012
  • Publisher: Deutsches Zentrum für Luft- und Raumfahrt (DLR)
  • Language: German
00:53 Deutsches Zentrum für Luft- und Raumfahrt (DLR) Silent film 2011

Marsmond Phobos

Phobos ist rund 9.400 Kilometer vom Marsmittelpunkt entfernt und umkreist den Mars in 7,6 Stunden etwa 6.000 Kilometer über dessen Oberfläche. Er ist der größere der beiden Marsmonde.
  • Published: 2011
  • Publisher: Deutsches Zentrum für Luft- und Raumfahrt (DLR)
  • Language: Silent film
06:06 Deutsches Zentrum für Luft- und Raumfahrt (DLR) German 2010

40 Jahre Mondlandung

Am 20. Juli 1969 stand die ganze Welt Kopf. Ein Jahrtausendtraum ging in Erfüllung. Erstmals landete eine bemannte Raumkapsel (Eagle) auf der Mondoberfläche. Im DLR-Webcast erinnert sich Raumfahrtjournalist Anatol Johansen an das historische Ereignis.
  • Published: 2010
  • Publisher: Deutsches Zentrum für Luft- und Raumfahrt (DLR)
  • Language: German
04:03 Deutsches Zentrum für Luft- und Raumfahrt (DLR) German 2009

Virtueller Flug zum Roten Planeten

Wie kann die physische und psychische Leistungsfähigkeit eines Menschen unter den extremen Flugbedingungen zum Mars erhalten werden? Diese Frage steht im Mittelpunkt der Isolationsstudie "Mars500". Bei dem Isolationsexperiment, das am 31. März 2009 in Moskau startet, werden sechs Menschen, darunter auch der deutsche ESA-Teilnehmer Oliver Knickel, für 105 Tage in einen Container eingeschlossen. Im russischen Institut für Biomedizinische Probleme (IBMP) trainieren die Teilnehmer in einem abgeschirmten Komplex die verschiedenen Aspekte eines simulierten Marsflugs, bei dem auch Experimente des Deutschen Zentrums für Luft- und Raumfahrt (DLR) durchgeführt werden.
  • Published: 2009
  • Publisher: Deutsches Zentrum für Luft- und Raumfahrt (DLR)
  • Language: German
06:51 IWF (Göttingen) Silent film 1971

Zerspanen der Aluminium-Legierung AlCuMgPb

The film shows how chippings are produced from a polished and etched testing workpiece made of the aluminium forging alloy AlCuMgPb during orthogonal cutting. Because of the coarse-crystalline structure with grains considerably larger than the maximum chip thickness, cutting causes the formation of chippings of varying appearances in individual crystals of differing orientation. The shearing area, chip-producing mechanism and visible deformation of the workpiece change with the different types of chip, from flowing chip to shearing chip. The influence of the cutting speed (0,01 to 10 m/min.), which is sometimes indicated by secondary shearing on the true rake, is usually concealed by the fact that the irregular chip-formation is a direct result of the structure orientation in this coarse, poly-crystalline material.
  • Published: 1971
  • Publisher: IWF (Göttingen)
  • Language: Silent film
06:19 IWF (Göttingen) Silent film 1971

Zerspanen von Stahl 9 S 20

The film shows how chippings are produced from a polished and etched testing workpiece made of the free-cutting steel 9 S 20 during orthogonal cutting. In the predominantly ferritic structure the chip formation is generally intermittent, as regards the primary and secondary deformation of shearing, the visible deformation of the workpiece and the chipping shapes. The effect of the cutting speed (0.01 to 5 m/min.) is indicated both by the formation of pick-up on the cutting edge and by secondary shearing on the true rake, with the formation of flow layers and the effect on the chipping curvature.
  • Published: 1971
  • Publisher: IWF (Göttingen)
  • Language: Silent film
10:12 IWF (Göttingen) Silent film 1975

Zerspanen von Stahl C 45 W 3

The film shows the process of chip formation on a polished and etched specimen of C 45 W 3 unalloyed tool steel. The various phenomena of chip formation and the individual deformation processes can be observed particularly well in the perlitic-ferritic structure of the material. The high compressive strain and the marked deformation of the material in the cutting edge zone caused by it have a strong effect on the build-up of material at the cutting edge. Approach and scraping cuts demonstrate the extreme stresses and straines imposed on that part of the cutting edge which determines the quality of the machined surface.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
06:07 IWF (Göttingen) Silent film 1970

Zerspanen von Stahl 16 MnCr 5

The film shows how chippings are produced from a polished and etched testing workpiece made of casehardening steel 16MnCr 5 during orthogonal cutting. The individual areas and stages of deformation during the formation of flowing chips are particularly worth watching in this markedly ferrito-perlitic structure. The effect of the cutting speed (0.01 to 5 m/min.) is shown firstly in the formation of pick-up on the cutting edge, which assumes unusual shapes particularly with large items, so that the formation of chips is also affected by the changed geometry of the cutting edges.
  • Published: 1970
  • Publisher: IWF (Göttingen)
  • Language: Silent film
04:31 IWF (Göttingen) Silent film 1975

Zerspanen von Stahl C 45 W 3

The film shows the process of chip formation on a polished and etched specimen of C 45 W 3 unalloyed tool steel. The various phenomena of chip formation and the individual deformation processes can be observed particularly well in the perlitic-ferritic structure of the material. The rake angle affects the type and extent of the stresses and strains to which the material is subjected in that the upsetting action and hence the shear strain increase as the positive rake angle becomes smaller and eventually turns negative. From this results the change from uniform flow chips at +45 degrees to irregular shear chips (curl chips) at -20 degrees.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
09:10 IWF (Göttingen) Silent film 1975

Zerspanen von Stahl C 45 W 3

The film shows the process of chip formation on a polished and etched specimen of C 45 W 3 unalloyed tool steel. The various phenomena of chip formation and the individual deformation processes can be observed particularly well in the perlitic-ferritic structure of the material. The central significance to the cutting process of the factor "cutting speed" becomes particularly evident in the build-up of material on the cutting edge which increase more and more at cutting speeds in the range of 5 to 60 metres per minute and in concequence fundamentally alters the cutting conditions at the cutting edge. the shape, size, and also the formation mechanism of such build-up are varied and unusual according to hitherto customary views.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
06:11 IWF (Göttingen) Silent film 1975

Zerspanen der Aluminium-Legierung AlCuMgPb

The film shows the process of chip formation in the orthogonal cutting of a polished and etched specimen consisting of the forging alloy AlCuMgPb. Owing to the coarse-crystalline structure of the alloy and the randomly oriented crystallites whose grain sizes are, in part, many times the thickness of individual chips, there is a correspondingly irregular variation in the resultant chip formation with the rake angle affecting the type of stresses and strains imposed on the material, that is to say the ratio of upsetting action to wedge action so that, with smaller and eventually negative rake angles, the chips become more irregular and change with increasing width of variation from flow chips to shear chips.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
07:35 IWF (Göttingen) Silent film 1975

Zerspanen von Gußeisen GG 20

The film shows the process of chip formation on a polished and etched or etch-polished specimen of GG 20 lamellar cast iron. Chip formation in the perlitic structure which is shot through with graphite lamellae, is characterised by a multiplicity of typical tear chips which are lifted out of, and detached from, the structure of the material in haphazard fashion, particularly at the graphite lamellae, and thus produce the peculiar surface characteristic of this particular engineering material.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
08:33 IWF (Göttingen) Silent film 1975

Zerspanen von Gußeisen GG 20

The film shows the process of chip formation on a polished and etched or etch-polished specimen of GG 20 lamellar cast iron. The formation of tear chips is typical of this material whose perlitic structure is shot through with graphite lamellae. Despite increasingly plastic deformation of the material at increasing cutting speeds with distinctly incipient build-up at the cutting edge, the chips formed in the cutting of this material retain nevertheless their irregular tear chip character.
  • Published: 1975
  • Publisher: IWF (Göttingen)
  • Language: Silent film
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