Electroscope
In this activity about electricity, learners suspend pieces of tape from a straw to construct an electroscope, a device that detects an electrical charge. Then, learners use a plastic comb to identify whether the pieces of tape are positively or negatively charged.
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Introduction

This course examines how small features can be etched and cut out of solid materials at a very small scale.

This OpenLearn course is an adapted extract from the Open University course T356 Engineering small worlds: micro and nano technologies.


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Date: 1870-1939




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Lesson 10 - One Minute Romanian
In lesson 10 of One Minute Romanian you will learn a few useful phrases which all learners want to learn. Remember - even a few phrases of a language can help you make friends and enjoy travel more. Find out more about One Minute Romanian at our website - http://www.oneminutelanguages.com. One Minute Romanian is brought to you by the Radio Lingua Network and is ©Copyright 2008.Author(s): No creator set

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Sneller klaar bundel : Allerlei opdrachten
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Kinderen van het eerste leerjaar die sneller klaar zijn, kunnen zelfstandig in deze bundel werken. Er komen heel wat rekenoefeningen aan bod zoals optellen, splitsen, aftrekken, de tafel van 2 en deze van 10. Dit afgewisseld met …


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Laser Scanning Christchurch Rockfalls
Garth Archibald uses a laser to scan cliffs that have been destabilized by earthquakes. This allows an assessment of potential rock fall hazards.  This is an interesting look at a geologist's work and shows aftermath of earthquakes.  (02:51)
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Educomics - Using digital comics in the classroom

Educomics is a European Union education project which will show educators how online comics can be used in the classroom. It has developed resource materials to support teachers in their use of digital comics.

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How Did English Evolve?
What is the difference between "a hearty welcome" and "a cordial reception"? In a brief, action-packed history of the English language, Kate Gardoqui explains why these semantically equal phrases evoke such different images.  (05:04)

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Music Visualization using Independent Component Analysis
Rene Castro
Elec 301 Project on Music Visualization Using Independent Component Analysis
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Shorty Award Campaign Video for @OleMissRebels
@OleMissRebels is nominated for a Shorty Award in the #BNcollege category! Launch us to the top by tweeting a nomination here: http://shortyawards.com/OleMissRebels.
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McMaster Welcome Speeches: Dr. Patrick Deane, President and Vice Chancellor
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Concert in Your Cranium
Watch here as experimental musician Mark Stewart of Polygraph Lounge plays a duet of every member of our audience. Using a small instrument of his own design, Mark teaches participants to use the bones in their skull as a resonator, creating 200 individual creative experiences.  (02:25)

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Public Perceptions of Privacy
Would you give somebody your bank PIN for a candy bar? Cryptanalyst Orr Dunkelman tells the cryptography panel about a surprising study that found that most people would. Why is that? Perhaps because this bit of information is just one part of a system that may also require their
name, address, card number, and so on, they assume it is safe to share this one detail. But in today’s information-based world, where much of one’s personal information is available at the click of a

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Market Pulse: 12/12/12, a red letter day for Greek bonds
It's perhaps fitting that today Greek bond yields have a 12% handle for the first time since April last year. And is 88 years enough for progress on the "fiscal cliff" talks?
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4.3.4 Wetlands

Wetlands can be used in a similar way to buffer strips as a pollution control mechanism. They often present a relatively cost-effective and practical option for treatment, particularly in environmentally sensitive areas where large waste-water treatment plants are not acceptable. For example, Lake Manzala in Egypt has been suffering from severe pollution problems for several years. This lake is located on the northeastern edge of the Nile Delta, between Damietta and Port Said. Land reclamatio
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4.4.1 Diversion of effluent

In some circumstances it may be possible to divert sewage effluent away from a water body in order to reduce nutrient loads. This was achieved at Lake Washington, near Seattle, USA, which is close to the sea. Lake Washington is surrounded by Seattle and its suburbs, and in 1955 a cyanobacterium, Oscitilloria rubescens, became dominant in the lake. The lake was receiving sewage effluent from about 70 000 people; this input represented about 56% of the total phosphorus load to the lake.
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3.3 Mechanisms of eutrophication

Direct effects of eutrophication occur when growth of organisms (usually the primary producers) is released from nutrient limitation. The resulting increased NPP becomes available for consumers, either as living biomass for herbivores or as detritus for detritivores. Associated indirect effects occur as eutrophication alters the food supply for other consumers. Changes in the amount, relative abundance, size or nutritional content of the food supply influence competitive relationships between
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3.2.5 Sediments

Sediments have a variable but complex role in nutrient cycling in most aquatic systems, and are a potential ‘internal’ source of pollutants. Release of phosphorus from lake sediment is a complex function of physical, biological and chemical processes and is not easy to predict for different systems. Nitrogen is not stored and released from sediments in the same way, so its turnover time within aquatic systems is quite rapid. Nitrogen concentrations tend to fall off relatively quickly foll
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Except for third party materials and/or otherwise stated (see terms and conditions) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Share