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11:59 IWF (Göttingen) German 1986
Found in:

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
13:07 IWF (Göttingen) German 1986
Found in:

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
12:25 IWF (Göttingen) German 2001
Found in:

Schlagzugbeanspruchung von spritzgegossenem Standard-Polystyrol

Initiation and growth of inhomogenous deformations and cracks in injection moulded transparent polystrene. The specimens are exposed to sudden tensile stress at room temperature showing stretch velocities of up to 10 %/min at the start. Due to fabrication dependent movable internal stress and orientation distributions the fracture inducing deformations always start inside the specimens.
  • Published: 2001
  • Publisher: IWF (Göttingen)
  • Language: German
10:11 IWF (Göttingen) German 1979
Found in:

Deformations- und Bruchverhalten von spritzgegossenem Standard-Polystyrol - Einfluß der Verformungsgeschwindigkeit bei Zugbeanspruchung

Kunststoffe werden mit unterschiedlichen Geschwindigkeiten belastet. Die verschiedenen Versagensmechanismen werden an spritzgegossenem Polystyrol mit zügiger, schlagartiger und konstanter Zugbeanspruchung demonstriert. Fließzonen, Sprödbruch, duktiler Bruch, Scherbänder, Scherdehnung, Normalspannungsanrisse. Zeitgleiche Aufnahmen, Zeitdehner- u. Zeitrafferaufnahmen.
  • Published: 1979
  • Publisher: IWF (Göttingen)
  • Language: German
09:41 IWF (Göttingen) Silent film 1976
Found in:

Zugbeanspruchung von spritzgegossenem Standard-Polystyrol

Initiation and propagation of crazes and the nucleation of cracking processes in injection moulded transparent polystyrene subjected to uniaxial tensile load at room temperature. The elongation speed effect on deformation behaviour is described. With slow-motion.
  • Published: 1976
  • Publisher: IWF (Göttingen)
  • Language: Silent film
09:12 IWF (Göttingen) Silent film 1976
Found in:

Zugbeanspruchung von spritzgegossenem Standard-Polystyrol

Initiation and propagation of crazes and the nucleation of cracking processes in injection moulded transparent polystyrene subjected to uniaxial tensile load at room temperature. The of bulk temperature used by injection moulding on deformation behaviour is described. With slow-motion.
  • Published: 1976
  • Publisher: IWF (Göttingen)
  • Language: Silent film
10:09 IWF (Göttingen) English 1979
Found in:

Craze-kinetics and Fracture Processes in Injection Moulded Standard polystyrene - Tensile Stress at Different Strain Rates

Plastics are subjected to tensiletensile stress at different strain rates. The different flaw mechanisms are demonstrated on the example of injection moulded polystyrene with quick, impact, and constant tensile load. Flow zones, brittle fracture, ductile fracture, shear bands, shear elongation, normal stress crazes. Simultaneous shots, slow-motion and time-lapse.
  • Published: 1979
  • Publisher: IWF (Göttingen)
  • Language: English
03:43 SciFox German 2013
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Berechnung des thermischen Gleichgewichts mit der Grundgleichung der Kalorimetrie

  • Published: 2013
  • Publisher: SciFox
  • Language: German
16:14 Bundesanstalt für Wasserbau (BAW) German 2010
Found in:

Wasserbauliches Versuchswesen

The Federal Waterways Engineering and Research Institute (BAW) is the central technical and scientific governmental agency of the German Federal Waterways and Shipping Administration (WSV) which is part of the German Federal Ministry of Transport, Building and Urban Affairs (BMVBS). This institute works with and does research on highly developed modelling and measuring techniques. In a model of the Elbe River near Schönberg the BAW investigates current flows behind groynes and in groyne fields. 3D Particle Tracking Velocimetry (PTV) records velocities and the conditions of the water surface. In the model of the Oder River near Hohenwutzen different groyne geometries are examined for improving the navigation conditions. Photogrammetric measuring during the experiment creates 3D images of the dune movement on the riverbed. The BAW also examines structures such as barrages and locks in models. The model of the weir Obernau (on the Main River) shows the effects of structural measures on navigation during high water. A principle model illustrates the mode of operation of an inflatable weir. Recuperation locks into canals reduce the water consumption. The BAW optimizes the functionality of the recuperation lock Minden in a model before construction is begun.
  • Published: 2010
  • Publisher: Bundesanstalt für Wasserbau (BAW)
  • Language: German
04:43 SciFox German 2013
Found in:

Mechanismus von Kettenreaktionen - Quasistationarität für alle reaktiven Zwischenprodukte

  • Published: 2013
  • Publisher: SciFox
  • Language: German
51:29 re:publica German 2013
Found in:

Marvin und der Blues

Musikroboter bieten eine neue Rezeptions und in diesem Fall Interaktionsstufe für die Wahrnehmung von Klang. Der hier beispielhaft vorgestellte Drumroboter MR-808 ist ein Replikat der stilprägenden analogen 80er Drum Machine TR-808 -- allerdings mit mechanischer Klangerzeugung! Wie Roboterinstrumente zum Musik machen benutzt werden können. Autonomer Drumroboter, mobiler Soundpanzer oder Smartphone gesteuerte Klanginstallation: Musikinstrumente selbstzubauen und neue Interfaces zu entwickeln bietet die Möglichkeit, vorgefertigten Klang-Setups und gewohnten Interaktionsweisen etwas eigenständiges entgegenzusetzen. Drumroboter und Klanginstallationen üben dabei sowohl physisch, optisch als auch von der Interaktion her einen besonderen Reiz aus: die Quelle des Klangs wird entdeckt und begreifbarer angesteuert. Ich habe mich in den letzten zwei Jahren mit der Entwicklung und dem Bau des mechanischen Drumroboters MR-808 beschäftigt.
  • Published: 2013
  • Publisher: re:publica
  • Language: German
01:53 Universität Bayreuth (UBT), Macromolecular Chemistry II No linguistic content; Not applicable 2013
Found in:

Functionalization of gold nanoparticles in two-phase system

The short video shows the well-established method of ligand-exchange, which is used for the introduction of ligands to nanoparticles in one-phase and two-phase systems. Here is shown ligand exchange of citric acid ligands on gold nanoparticles against vinyl-pyridine functionalized polystyrene.
  • Published: 2013
  • Publisher: Universität Bayreuth (UBT), Macromolecular Chemistry II
  • Language: No linguistic content; Not applicable
1:53:30 OpenWebcast.nl, Foundation for Fundamental Research on Matter (FOM) English 2013
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Master class with Sibylle Günter

Nuclear fusion could play a major role in the energy mix during the second half of this century. The advantages of nuclear fusion, in particular for base load power stations, are obvious: the fuel is nearly unlimited and widely available, and - in contrast to fission - there is no possibility of a runaway reaction or meltdown. After more than 50 years of research, fusion has advanced to the decisive step on the way to a power plant: the international tokamak experiment ITER is designed to demonstrate the feasibility of net energy production from nuclear fusion reactions. For a fusion reactor, matter has to be heated up to extremely high temperatures: more than 100 million degrees - about a factor of 10 hotter than the sun's core. At these temperatures the material is fully ionized. The charged particles can be confined by magnetic fields, which are also able to provide the required efficient heat insulation. For magnetic fusion reactions to be self-sustaining, the thermal insulation has to be a factor of 100 better than that of polystyrene - at temperatures, where the velocity of particles approaches one fifth of the velocity of light! The physics basis of such magnetic confinement will be discussed. The two alternative concepts on the way to a fusion power plant: the tokamak and the stellarator will be introduced and the remaining scientific challenges for magnetic fusion will be discussed.
  • Published: 2013
  • Publisher: OpenWebcast.nl, Foundation for Fundamental Research on Matter (FOM)
  • Language: English
04:01 Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG) English 2017
Found in:

Large scale micro-photometry for high resolution pH-characterization during electro-osmotic pumping and modular micro-swimming

Micro-fluidic pumps as well as artificial micro-swimmers are conveniently realized exploiting phoretic solvent flows based on local gradients of temperature, electrolyte concentration or pH. We here present a facile micro-photometric method for monitoring pH gradients and demonstrate its performance and scope on different experimental situations including an electro-osmotic pump and modular micro-swimmers assembled from ion exchange resin beads and polystyrene colloids. In combination with the present microscope and DSLR camera our method offers a 2 μm spatial resolution at video frame rate over a field of view of 3920 × 2602 μm2. Under optimal conditions we achieve a pH-resolution of 0.05 with about equal contributions from statistical and systematical uncertainties. Our quantitative micro-photometric characterization of pH gradients which develop in time and reach out several mm is anticipated to provide valuable input for reliable modeling and simulations of a large variety of complex flow situations involving pH-gradients including artificial micro-swimmers, microfluidic pumping or even electro-convection.
  • Published: 2017
  • Publisher: Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG)
  • Language: English
02:39 Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG) English 2015
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Surface rippling induced by periodic instabilities on a polymer surface

When the shear stress on a compliant surface exceeds the yield strength of the material, a periodic wrinkle pattern is often observed. This phenomenon has been also recognized at the nanometer scale on polymers, metals, ionic crystals and semiconductors. In those cases, the mechanical stress can be efficiently provided by a sharp indenter elastically driven at constant velocity along the surface. Here we suggest that the formation of such surface ripples can be explained by the competition between the driving spring force and the plastic response of the substrate. In particular, we show how the ripples are expected to disappear when the indentation rate is below a critical value or, alternatively, when the sliding velocity or the lateral stiffness of the contact are too high. The model results are compared to atomic force microscopy experiments on a solvent-enriched polystyrene surface, where the rippling formation is enhanced at room temperature, compared to bulk melts. A similar approach could be employed to describe rippling phenomena on larger scales.
  • Published: 2015
  • Publisher: Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG)
  • Language: English
1:12:21 Phillies, George English 2012
Found in:

14 Probe Diffusion, Part 1

Lecture 14 - Probe diffusion, part 1. George Phillies lectures on polymer solution dynamics, based on his book "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:11:27 Phillies, George English 2012
Found in:

15 Even More Probe Diffusion

Lecture 15 - more on probe diffusion. Lectures are based on my book "Phenomenology of Polymer Solution Dynamics", Cambridge University Press 2011.
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:12:42 Phillies, George English 2012
Found in:

12 Self and Tracer Diffusion, Part 2

Lecture 12 - Polymer self and tracer diffusion, part 2. George Phillies lectures on polymer dynamics based on his book "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:18:50 Phillies, George English 2012
Found in:

9 Dielectric Relaxation, Part 2

Lecture 9 - dielectric relaxation, part 2. George Phillies lectures on polymer dynamics, based on his book "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:04:56 University of California Irvine (UCI) English 2012
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Lecture 18. Amino Acids, Peptides, and Proteins.

This is the third quarter course in the organic chemistry series. Topics covered include: Fundamental concepts relating to carbon compounds with emphasis on structural theory and the nature of chemical bonding, stereochemistry, reaction mechanisms, and spectroscopic, physical, and chemical properties of the principal classes of carbon compounds. Index of Topics: 2:49-Amino Acid Structure 5:55-Examples of Polypeptides 12:18-20 Common Amino Acids 17:03-Polar & Charged Amino Acids 22:35-Chemical Synthesis of Peptides and Proteins 27:49-Protecting Groups 31:54-DCC 40:07-Boch Deprotection Mechanism 42:44-Special Amino Acids 43:33-Additional Protecting Groups 46:42-Modern Solid-Phase Peptide Synthesis 54:20-Boch Opolystyrene Example 59:54-Fmoc Group
  • Published: 2012
  • Publisher: University of California Irvine (UCI)
  • Language: English
1:13:48 Phillies, George English 2012
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21 QELSS from non-dilute solutions

Lecture 21 - the polymer slow mode; thermal diffusion and Soret coefficients. George Phillies lectures on polymer dynamics based on his book "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:07:19 Phillies, George English 2012
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22 Viscosity

Lecture 22 - viscosity. George Phillies lectures on polymer dynamics, based on his book "Phenomenology of Polymer Solution Dynamics"
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:02:31 Phillies, George English 2012
Found in:

11 Self and Tracer Diffusion, Part 1

Lecture 11 - self and tracer polymer diffusion. George Phillies lectures on polymer Dynamics, based on his book "Phenomenology of Polymer Solution Dynamics". At about the 20 minute mark, there is indeed a slight gap. I decided there was a better way to present something, and will do so at some point in a retake, something not possible in live lectures.
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
50:50 Phillies, George English 2012
Found in:

6 Small-Molecule Motion

Lecture 6 - small-molecule motion. George Phillies lectures on polymer dynamics based on his book "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:32:57 Phillies, George English 2012
Found in:

30 The Hydrodynamic Scaling Model

Lecture 30 and last - The Hydrodynamic Scaling Model. George Phillies lectures from his text "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
30:49 Chaos Computer Club e.V. English 2015
Found in:

A practical prototyping primer

This will be a rapid-fire, tips-and-tricks lecture on practical prototyping. It will cover a series of practical tips, strategies & techniques, illustrated with all the mistakes I made over the past 10 years designing & building stuff. The lecture is intended for a non-specialized audience with a basic understanding of what a lasercutter, a 3D-printer and a milling machine does.
  • Published: 2015
  • Publisher: Chaos Computer Club e.V.
  • Language: English
1:17:58 Phillies, George English 2012
Found in:

1 Course Introduction

Lecture 1 -- course introduction. George Phillies lectures a series of graduate classes, based on his book "Phenomenology of Polymer Solution Dynamics" Cambridge University Press, 2011.
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:10:49 Phillies, George English 2012
Found in:

13 Self and Tracer Diffusion Part 3

Lecture 13 - polymer self and tracer diffusion, part 3, the last. George Phillies lectures on polymer dynamics, based on his book "Phenomenology of Polymer Solution dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:16:41 Phillies, George English 2012
Found in:

16 Yet More Probe Diffusion

Lecture 16 - yet more on probe diffusion. George Phillies lectures on polymer dynamics from his book "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:25:17 Phillies, George English 2012
Found in:

4 Electrophoresis

Lecture 4 - electrophoresis. George Phillies lectures on polymer dynamics based on his book "Phenomenology of Polymer Solution Dynamics" (Cambridge University Press, 2011).
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:17:31 Phillies, George English 2012
Found in:

28 Inferences from Phenomenology

Lecture 28 - Inferences from Phenomenology. George Phillies lectures from his text "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
20:53 Technical University of Denmark (DTU), The Department of Energy Conversion and Storage English 2015
Found in:

Contactless web cleaning

  • Published: 2015
  • Publisher: Technical University of Denmark (DTU), The Department of Energy Conversion and Storage
  • Language: English
1:12:45 Phillies, George English 2012
Found in:

8 Dielectric Relaxation, Part 1

Lecture 8 - dielectric relaxation, part 1. George Phillies lectures on polymer dynamics based on his book "Phenomenology of Polymer Solution Dynamics" (Cambridge University Press, 2011)
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
1:08:07 Phillies, George English 2012
Found in:

29 More Inferences from Phenomenology

Lecture 29 - More Inferences from Phenomenology. George Phillies lectures from his text "Phenomenology of Polymer Solution Dynamics".
  • Published: 2012
  • Publisher: Phillies, George
  • Language: English
37:13 Chaos Computer Club e.V. English 2017
Found in:

Drones of Power: Airborne Wind Energy

Airborne wind energy is the attempt to bring the digital revolution to the production of energy. It means that we convert the power of high-altitude winds into electricity by autonomously controlled aircraft which are connected to the ground via a tether. This technology can be a key element to finally power the world by clean energy only. In this talk we will explain the physical foundations, give an overview of the current status and show you how to build an experimental system by yourself: it involves hacking an off-the-shelf model aircraft and its autopilot based on the open and free Ardupilot framework.
  • Published: 2017
  • Publisher: Chaos Computer Club e.V.
  • Language: English
1:20:56 University of California Irvine (UCI) English 2012
Found in:

Lecture 08. The Chemistry of the Carboxylic Acid Family.

This is the third quarter course in the organic chemistry series. Topics covered include: Fundamental concepts relating to carbon compounds with emphasis on structural theory and the nature of chemical bonding, stereochemistry, reaction mechanisms, and spectroscopic, physical, and chemical properties of the principal classes of carbon compounds. Index of Topics: 2:00-Carboxylic Acid Derivatives 5:54-Nomenclature 17:44-Acid Chlorides and Anhydrides 22:28-Boiling Points of Esters Versus Alkanes 26:22-Resonance Structures 28:59-Properties of Amides 35:12-IR Spectroscopy 43:51-Reaction of Acid Chloride and Anhydride in Water 45:05-Reaction of Esters and Amides in Water 51:58-NMR of Carbonyls 54:51-Carboxylic Acid Derivatives and Nucleophiles 58:08-Weakly Basic Nucleophiles 1:00:49-Balanced Equation Example 1:05:19-Student Question 1:09:28-Acid Chloride Reaction Example 1:14:11-Relative Reactivity of Carboxylic Acid Derivatives 1:17:44-Anhydride Reaction
  • Published: 2012
  • Publisher: University of California Irvine (UCI)
  • Language: English
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