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42:12 IWF (Göttingen) English 1986

The 1984 South Tibet and Mount Everest Expedition - Geographical Investigations in Upland Asia

Physical geographic investigations (geomorphological, glaciological, climatological) in South Tibet: Trans-Himalaya, Tibetan Himalaya, Northern Slope of the Great Himalaya (Shisha Pangma 8,046 m, Mount Everest 8,848 m) on a German-Chinese joint enterprise, the first scientific expedition in which researches from the West reached the Northern flank of Mount Everest. As well as following the expedition (climbing with pack-animals, setting up high-altitude camps etc.), the film shows the working techniques of modern field research and how measurement data are obtained.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
10:31 IWF (Göttingen) German 1986

Freier Drehfall und Bruchverhalten seitlich umgelegter Schornsteine

A chimney is brought down laterally by blasting, fracture mechanics: acceleration in free rotation fall, tensile stress and compressive strain, inertial forces (animated cartoon), stability limit, computer simulation of the change in forces with time, slow motion pictures of blasts. Model experiments: falling beam with a golfball and collecting beaker, also partly in slow motion.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1986

Elektroortung und -Kommunikation beim Tapirfisch Gnathonemus petersii

Discharges from the electrical organ of the weakly electrical fish Gnathonemus petersii are recorded through electrodes in an aquarium, they are displayed on an oscilloscope synchronously with the fishes' activities and are rendered audible. Trick pictures show the fish's electrical streamline field as well as it locating good and poor conductors of electricity. While behaving aggressively, the fishes' discharges are recorded and shown in the film.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
18:04 IWF (Göttingen) German 1986

Die Rotbuche (Fagus sylvatica) im Ablauf des Jahres

Außenaufnahmen im Buchenwald: Verjüngung und Schattenwuchs der Rotbuche, Bodenkräuter, Bodenprofil, Mykorrhiza und Wurzelsymphysen zwischen verschiedenen Baumindividuen. Entfaltung von Laub- und Blütenknospen, Anthese männlicher und weiblicher Blüten, Öffnung der Fruchtbecher mit Entlassung von Bucheckern, Laubverfärbung, Keimung der Buchecker und Entfaltung der Primärblätter. Morphologische Details und ökologische Zusammenhänge werden angesprochen. Mit Zeitraffung.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) German 1986

Das Langhaus; Dorfleben in Tumbang Gagu - Ngadju-Dayak (Indonesien, Zentralkalimantan)

The film shows the architecture and the interior decoration of a longhouse built in 1873 (50 metres long, 14 metres wide, constructed upon 30 ironwood girders 15 metres above the ground) and the daily life of its inhabitans: rice cultivation, collecting and processing rotan, village life on the river bank, aspects of the veneration of the dead. During a welcome festival, in which the whole village takes part, different dances are performed.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
12:08 IWF (Göttingen) Silent film 1986

Syrphus balteatus (Syrphidae) - Beutefangverhalten der Larve

Larvae of Syrphus balteatus exhibit three strategies when seizing their prey: 1. passive waiting for single aphid, 2. active seizing of a single aphid, 3. active seizing of a colony of aphids (refers to larvae of 3rd and 4th stage).
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
04:47 IWF (Göttingen) Silent film 1986

Aphis fabae (Aphididae) - Geburt

Two examples document the birth process. With several quick thrusts the virgo forces the young louse out of oviduct with its abdomen forward. With the head remaining in the oviduct of the virgo, the young louse bursts open the embryonal sheath along the preformed dorsal suture. The embryonal sheath is stripped off by continous displacement of the haemolymph. After the legs of the young louse have been freed from the sheath and have a hold on the back of a conspecific, the virgo disconnects itself from the newly born larva by a twishing movement of the abdominal tip.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1986

Polygordius appendiculatus (Archiannelida) - Metamorphose

The film begins with the metatrochophora (endolarva) of Polygordius, which already shows a few involvations of the annelid body, and it ends with the juvenile archiannelid.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
02:07 IWF (Göttingen) Silent film 1986

Farbige Schatten

"Coloured" shadows were thought to exist and were physically interpreted for a long time. In Rumford's experiment a "coloured" shadow proves to be achromatic-grey if the inducing, objective comlementarily-coloured background is completely or even partly withdrawn.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
13:40 IWF (Göttingen) English 1986

Heathland Beekeeping - 2. Central Europe, Northern Lower Saxony - Preparations for the Swarming Period in a Heather Skep Apiary

After first flowering the bees are collected and returned to the premises of beekeeper Georg Klindworth (Langenfelde bei Sittensen) where they receive artificial food. Tools are inspected and repaired in preparation for swarming. Nets, boxes for sending the animals, basket hives are repaired and sealed in cow dung.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
12:17 IWF (Göttingen) English 1986

Heathland Beekeeping - 3. Central Europe, Northern Lower Saxony - Work in a Heather Skep Apiary during the Prime Swarming Period

Swarming time for the bees on the heath lands starts an the beginning of june and lasts several weeks. Instantly a pre-swarm with the old queen leaves the hive they are caught in a net. When the bees in the bag have made a stable ball, they are placed in boxes and sent for sale.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
42:05 IWF (Göttingen) German 1986

Die Südtibet- und Mt. Everest-Expedition 1984 - Geographische Untersuchungen in Hochasien

Physisch-geographische Untersuchungen (geomorphologisch, glaziologisch, klimatologisch) in Südtibet: Transhimalaya, Tibetischer Himalaya, Nordabdachung des Hohen Himalaya (Shisha Pangma 8046 m, Mt. Everest 8848 m) bei einer deutsch-chinesischen Gemeinschaftsunternehmung, der ersten wissenschaftlichen Expedition, auf der westliche Forscher in die Mt. Everest-Nordflanke gelangen. Neben dem Expeditionsablauf (Aufstiege mit Tragtieren, Aufbau von Hochlagern etc.) werden Arbeitstechniken moderner Feldforschung und die Gewinnung von Meßdaten gezeigt.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
11:08 IWF (Göttingen) English 1986

Heterodera schachtii (Nematoda) - Behaviour Inside the Root (Rape)

In vivo observation of the reaction of infected cells and the behaviour of nematodes during salivation deep inside the host root. Salivation following food intake into the bowel. Formation of salivary ducts. Use of 875-line video equipment. Presentation includes quick-motion sequences.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
11:10 IWF (Göttingen) German 1986

Heterodera schachtii (Nematoda) - Verhalten im Innern von Wurzeln (Raps)

In-vivo-Beobachtungen der Reaktion infizierter Zellen und des Verhaltens des Nematoden bei der Speichelabgabe tief in der Wirtswurzel. Speichelabgabe nach beendeter Nahrungsaufnahme in den Darm. Bildung von Speichelröhrchen. Unter Verwendung einer 875-Zeilen-Videotechnik. Mit Zeitraffung.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
13:07 IWF (Göttingen) German 1986

Langzeitverhalten von spritzgegossenem Standard-Polystyrol - Fließzonenbildung (Crazing)

Polystyrene shouldered rods (DIN 53455 No. 3) are observed under tensile strain (46 to 177 h) in polarised light and with time-lapse photography as a function of its injection temperature (180 to 240° C). As a result of specific loading conditions, elongation without necking and inhomogeneous deformation in the form of a craze (flow zone) (see Film B 1614 on necking) occur.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
11:59 IWF (Göttingen) German 1986

Langzeitverhalten von spritzgegossenem Standard-Polystyrol - Einschnürungen

Polystyrene shouldered rods (DIN 53455 No. 3) are observed under tensile strain (46 to 177 h) in polarised light and with time-lapse photography as a function of its injection temperature (180 to 240° C). As a result of specific loading conditions, elongation without necking and inhomogeneous deformation in the form of an elongation without necking (see Film B 1613 on crazing).
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
10:12 IWF (Göttingen) Silent film 1986

Castor fiber canadensis (Castoridae) - Verhalten in der Burg. Mutter und Jungtiere

In a dan, a female brings up two cubs. Patterns of behavious of the mother and of the cubs during different stages of life are shown. The animals are always in the main room at the pool of the "lodge". Here, the mother combs her own and the cubs' fur. With the cleaning claw of the hind foot, she combs thoroughly the fur of the flanks, the neck and the head. One of the cubs tries to comb itself dry too. It succeeds in doing that already very well, without the mother's help, because it has already grown up a little. The mother and the cubs are gnawing willow twigs.The bark is peeled by turning the twig around and the leaves are eaten, one after the other. During this period of tasting solid food the cubs are still suckled.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
15:50 IWF (Göttingen) German 1986

Ascus- und Fruchtkörperentwicklung bei Ascomyceten

Kerngeschehen bis zur Ascosporenentlassung bei Dipodascus, Haken- und Ascusbildung bei Byssochlamys (vgl. C 1423, K 146, K 162), Kleistothezienbildung bei Eurotium, Apothezienbildung und Sporenabschuß aus operculaten Asci bei Ascobolus, Perithezienbildung bei Sordaria, Sporenabschuß bei Podospora, Sporenabschuß aus bitunicaten Asci von Pseudothezien bei Pleospora. Zeitraffung, REM.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
10:27 IWF (Göttingen) German 1986

Beutefang, Nahrungsaufnahme und Verdauung bei Actinophrys sol (Heliozoa)

The heliozoan Actinophrys captures its prey with the help of axopodia. Ingestion takes place by the growth of a bell-shaped pseudopodium which gradually surrounds, and finally, completely encloses the prey. Digestion then occurs. These events are demonstrated in computer animation together with electron micrographs. Time-lapse.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
10:27 IWF (Göttingen) English 1986

Prey-Catching, Food-intake and Digestion in Actinophrys sol (Heliozoa)

The heliozoan Actinophrys captures its prey with the help of axopodia. Ingestion takes place by the growth of a bell-shaped pseudopodium which gradually surrounds, and finally, completely encloses the prey. Digestion then occurs. These events are demonstrated in computer animation together with electron micrographs. Time-lapse.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
16:05 IWF (Göttingen) English 1986

Ascus and Fruitbody Development in Ascomycetes

Nuclear activity up to ascospore release in Dipodascus, ascogenous hyphae formation and ascus formation in Byssochlamys (compare C 1423, K 146, K 162), cleistothecia formation in Eurotium, apothecia formation and spore release from operculate asci in Ascobolus, perithecium formation in Sordaria, release of spores in Podospora, release of spores from bitunicate asci in pseudothecia of Pleospora. Time-lapse, REM.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
23:53 IWF (Göttingen) German 1986

Tribologie - Reibung, Verschleiß, Schmierung - Kurzfassung

Economic loss as a result of abrasion in traffic and domestic industries. Tribology in industry: tribo system, the influence of geometry, material, buffer, repair. Examples of minimization of friction and abrasion. Research and applied advice.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
38:58 IWF (Göttingen) German 1986

Tribologie - Reibung, Verschleiß, Schmierung

Volkswirtschaftliche Verluste durch Reibung auf dem Verkehrs-, Industrie- und Haushaltssektor. Der Tribologe in der Industrie. Tribosystem, Einflußbereiche; Geometrie, Werkstoff, Zwischenstoff, Instandhaltung. Beispiele zur Verringerung von Reibung und Verschleiß: Elastische Gleitlagerschalen, wellenförmige Gleitring-Dichtungsfläche, Baggerschaufelbeschichtung durch Auftragsschweißen, CVD-Beschichtung von Schneidplatten, Laserstrahlhärten von Großdieselzylinderbuchsen, Schmierölanalyse, Schmierfetttest, Hydraulikflüssigkeitsbrenntest, Schwingungsanalyse zum Aufspüren von Verschleiß. Tribologieforschung, Technologietransfer, anwendungsorientierte Beratung.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
06:15 IWF (Göttingen) Original sound, no spoken text 1986

Castor fiber canadensis (Castoridae) - Fällen und Zerteilen eines Baumes

At night an adult beaver is occupied with cutting down a 30 cm thick polar. The trunk is already half cut in. Small yellow bark chips and relatively big corewood chips are lying around the tree. The beaver is cutting right-sidedly (=the right side of the head is turned upwardly) and left-sidedly. It always keeps its head in the same angle to the vertical running wood fibre. It expands the notch beyond the centre of the trunk. During and between the gnawing periods, the bever wipes the chips off the notch with its hands. In short breaks, the gnawing teeh are whetted. Finally, the deep, one-sided notch makes the poplar fall down. The bever cuts off an arm-thick branch and trails it away. Then it divides a neck-thick trunk. The notch is widened only to head-size. By numerous bites the notch is deepened; then the beaver raises its head, clens its mouth from the wooden chips and sits up to look around. Having made a cut around the trunk, the beaver raises it and the trunk breaks into two parts. The bigger one is trailed away in a right-sided transport.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Original sound, no spoken text
Offline Collection IWF (Göttingen) Silent film 1986

Syrphus balteatus (Syrphidae) - Eiablageverhalten

Syrphus balteatus females which are ready to oviposit manoeuvre between bean plants (Vicia), which are densely infested with black bean lice (Aphis fabae). Rotations of up to 360 degrees made in whirring flight serve as visual orientation and the whirring flights underneath the colonies of plant-lice serve as olfactory orientation. The stream of scent from the plant-lice is drawn in. The following egg-laying behaviour is demonstrated with a number of examples.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1986

Syrphus balteatus (Syrphidae) - Schlüpfen aus der Puppe

Three examples show the eclosion process. The fly exerts pressure on the preformed fracture lines of the puparium when it is ready to hatch. The dorsal and ventral puparium lids are pressed apart as the head appears. The antennae, which were held tightly against the head in the puparium, are freed to take up their regular positions. They fly pushes itself further out of the puparium with peristaltic movements of the body. Shortly after the mesothorax is visible, the front legs are drawn out, assisting and accelerating the eclosion process with pulling movements. After the mid and hind legs are free, the fly leaves the puparium sidways. The wings are then unfolded and the colouring process is completed.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
Offline Collection IWF (Göttingen) Silent film 1986

Syrphus balteatus (Syrphidae) - Putzverhalten

The grooming behaviour of Syrphus balteatus is shown in numerous sequences of movement, some shot in slow-motion. The grooming organs are the tarsal and tibial hairs of the forelegs and hindlegs. The forelegs clean the head and antennae, the head turning up to 180 degrees in both directions to make all regions readily accessible. Particles of dirt collected by the tarsae during this activity are removed by reciprocal cleaning. The hindlegs clean the tergum, the upper and lower sides of the wings, the tip of the wings, the halteres and the upper side of the abdomen as well as themselves.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
07:20 IWF (Göttingen) German 1986

LKW-Blattfeder aus Glasfaserkunststoff auf dem Prüfstand

Federbelastungen und Radführungskräfte werden an einem LKW-Fahrwerk erläutert. Eine unidirektional glasfaserverstärkte Kunststoff-Blattfeder wird auf einem Mehrachsenprüfstand untersucht. Die Ermüdung der Feder aufgrund ungünstiger Krafteinleitung in der Federmitteneinspannung führt zum Schubbruch. Fail-safe-Verhalten. Erheblich spätere Ermüdung wird erreicht durch optimierte Mitteneinspannung. Anstelle des Schubbruchs tritt allmähliches Auffasern an der zugbelasteten Seite der Feder ein.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
15:15 IWF (Göttingen) English 1986

Falco fasciinucha (Falconidae) - Breeding Biology

The rare Taita Falcon lives in mountainous and riverside terrain in East and South Africa. It breeds in inaccessible rock cliffs. The young are fed almost exclusively with swallows and swifts. The shots were taken in the vicinity of the aerie, commencing with copulation and ending with young leaving the nest.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
15:15 IWF (Göttingen) German 1986

Falco fasciinucha (Falconidae) - Brutbiologie

Der seltene Taitafalke bewohnt Berg- und Flußlandschaften von Ost- und Südafrika. Er brütet in unzugänglichen Felswänden. Die Jungen werden fast ausschließlich mit Schwalben und Seglern gefüttert. Die Aufnahmen entstanden in Horstnähe vom Beginn der Begattungen an bis zum Ausfliegen der Jungen.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
07:20 IWF (Göttingen) English 1986

Truck Leaf Spring Made of Glass-Fibre Reinforced Plastics on Test Rig

In modern trucks the axle is generally steered by lengthwise positioned leaf springs. A model is used to display the different loads absorbed and transferred by this kind of spring. In order to reduce the structural weight, especially of unsprung masses, efforts are nowadays being made to replace the relatively heavy steel springs with light glass-fibre reinforced plastic springs.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
03:31 IWF (Göttingen) Silent film 1986

Columba livia domestica (Columbidae) - Flug der Rollertauben

The film shows various flight manoeuvres of roller pigeons taken at normal speed and in slow-motion: climbing and horizontal flight, complete rolling motion and several rolls backwards, one after the other. The clips are reduced by 20 times their normal speed so that we can clearly see the procedures necessary for this unusual manoeuvre.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: Silent film
13:41 IWF (Göttingen) German 1986

Heideimkerei - 2. Mitteleuropa, Nördliches Niedersachsen - Vorbereitungen auf die Schwarmzeit in einer Korbimkerei

After first flowering the bees are collected and returned to the premises of beekeeper Georg Klindworth (Langenfelde bei Sittensen) where they receive artificial food. Tools are inspected and repaired in preparation for swarming. Nets, boxes for sending the animals, basket hives are repaired and sealed in cow dung.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
12:19 IWF (Göttingen) German 1986

Heideimkerei - 3. Mitteleuropa, Nördliches Niedersachsen - Arbeiten zur Zeit der Vorschwärme in einer Korbimkerei

Swarming time for the bees on the heath lands starts an the beginning of june and lasts several weeks. Instantly a pre-swarm with the old queen leaves the hive they are caught in a net. When the bees in the bag have made a stable ball, they are placed in boxes and sent for sale.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: German
39:00 IWF (Göttingen) English 1986

Tribology - Friction, Abrasion, Lubrication

Examples taken from the traffic sector, from the household and from industry, especially heavy industry, show that movements occuring in technological processes are generally connected with friction. Friction always causes losses of energy and often also results in wear. Losses of this kind amount to about 40 billion West German Marks per annum in the Federal Republic of Germany. The obejctive of the scientific discipline of tribology is to reduce such losses. Tribology is the science and technology of surfaces moving against one another which are in contact with and interacting with one another and the processes involved in these movements (DIN 50 323). The work of a tribology staff division is shown working on the practical case of a broken down pinion mechanism on a rolling mill. That serves as an introduction to an explanation of the "Tribology System" (basic and counter body, with and without precursor, environmental medium, strain collective, loss of energy, abrasion, capability of being influenced). The film shows how the tribosystem can be carefully developed towards better and longer operability by: geometric design (calculating friction bearings, testing rotating mechanical seal); selection of tools for basic and counter body (dredging shovel with layer of welding, CVD coating on slipping beds, laser hardening on cylinder liners; choice of lubricant (spectral analysis of lubricating substances, compatibility of plastics with lubricating oils, examination of lubricating grease, poorly combustible hydraulic fluids). The operability of a tribosystem applied over a longer period of time must be maintained by: maintaince (checking lubricating substances, analysis of oscillation frequency). Research and development is done in all areas of tribology. The Federal Department for Research and Technology assists by encouraging a number of research projects of which a few are mentioned. In order to reduce the large losses caused by friction, the knowledge already available on tribology must be passed on, particularly to small and middle-scale industrial enterprises, by means of technology transfer and innovation. The task of the Society for Tribology-Consulting is to be of help here. The Society and its work are introduced at the end of the film.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
18:05 IWF (Göttingen) English 1986

The Common Beech (Fagus sylvatica) in the Course of the Year

Filming in a beech forest: Rejuvenation and shade growth of beech, ground-covering herbs, soil profile, mycorrhiza and root-connections between different individual trees. Expansion of leaf and flower buds, maturation of male and female flowers, opening of cupules with release of fruits, autumnal leaf colouration, germination of beech fruits and expansion of primary leaves. The film discribes morphological details in an ecological context.
  • Published: 1986
  • Publisher: IWF (Göttingen)
  • Language: English
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