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High magnification SEM image of open cell polyurethane foam
If a gas is injected into a liquid it forms a cellular foam structure. When a thermoset prepolymer of low viscosity is foamed, the polymer can drain from the cell walls (driven by surface tension) before it sets at the cell edges, leaving an open-celled foam. The cell edges have three concave sides, and some remnants of collapsed cell walls can be seen at the cell edges.
Author(s): DoITPoMS, University of Cambridge,J A Curran, Depa

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3.1 Introduction

In this section the focus turns towards the supply side of the market, towards firms and industries, exploring the importance of costs and technological change in the organisation of production. The objective is to understand some of the different kinds of change in industrial structure, namely changes in the number and size of firms in an industry. One such change saw the emergence of Ford, initially one among many similar firms jostling for position in the US automobile industry, as the ind
Author(s): The Open University

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What Happens If U.S. Supreme Court Decisions End In A Tie?
(03:54)
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Cleaning a Personal Computer Keyboard
Learn from our expert some great techniques for cleaning your computer keyboard.
 
You need some electronic wipes, a can of air and a toothbrush to clean the keyboard.  This video takes you through the steps to be able to clean out your keyboard.

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1.2 Balanced energy intake

There is a need for a certain daily energy intake to allow metabolism to occur in the body. Metabolism means all the chemical reactions occurring in the body and there are two types of process involved: catabolism breaks down larger molecules into smaller ones often with energy release and anabolism is the building up of larger molecules from smaller precursors, often requiring energy. The body requires energy to power anabolic, mechanical (for example, muscle contraction
Author(s): The Open University

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Meat-Eating Sundew Plant
This is a segment from Nature Walks with Mark about the carnivorous Sundew plant. (03:30)
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Elektrische energieopslag : Een kijk naar de toekomst
battery.png

In deze cursus een overzicht van de huidige soorten batterijen en wat in de toekomst de mogelijke uitbreidingen kunnen zijn voor wat betreft elektrische energieopslag.


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Hong Kong police dismantle protest site
Hong Kong police have dismantled the city's main pro-democracy protest site after hauling away protesters, ending more than two months of street demonstrations. Rough Cut (no reporter narration). Subscribe: http://smarturl.it/reuterssubscribe More updates and breaking news: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, fin
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Building Simple Machines:  Plant Quencher
How difficult can it be to water a plant? Pretty difficult when your objective is to build the most complicated machine possible to complete this simple task. In this video segment from ZOOM, Jillian demonstrates the use of ramps, wheels, pulleys, and other simple machines to construct her "plant quencher." Closed captioning included. 
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Introduction to Work with Examples
An introduction to the physics equation for work, including a few basic examples of positive vs. negative work. (07:09)
Want Lecture Notes? This is an AP Physics 1 topic.

Content Times:
0:07 The Work Equation
0:45 Physics work is not what you normally think of as work
2:07 Example #1
2:46 Example #2
3:35 Example #3
4:10 Example #4
5:05 Joules, J, the units for work
5:43

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Climate Change: What it Means to Plants and Animals
Climate Change: What it Means to Plants and Animals
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Dr. Guido Tricot, Part One: Exploring Myeloma (Video)
Dr. Guido Tricot, the director of the Utah Blood and Marrow Transplant and Myeloma Program, gives an overview of multiple myeloma. He discusses the history, causes and risks factors, incidence rates, diagnosis, and treatment of this type of cancer.
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Future of the Union: Northern Ireland [Audio]
Speaker(s): Martin McGuinness MP MLA | Editor's note: The recording comprises the lecture only, it does not include the the question and answer session. There was a short interruption 11 minutes into the lecture owing to fire alarm, this section has been edited out of the recording. The deputy first minister of Northern Ireland will discuss his view of Northern Ireland’s position in the future of the Union. Martin McGuinness is a Sinn Féin politician and the current deputy first minister of N
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1.11 Addition and subtraction in practice - fluid balance

A common healthcare example that uses addition and subtraction involves calculating the fluid balance of a patient.

Fluid balance is a simple but very useful way to estimate whether a patient is either becoming dehydrated or overfilled with liquids. It is calculated, on a daily basis, by adding up the total volume of liquid that has gone into their body (drinks, oral liquid medicines, intravenous drips, transfusions), then adding up the total volume of liquid that has come out of their
Author(s): The Open University

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5.6 Modernity – challenging tradition

Delacroix also challenged tradition in paintings like Greece on the Ruins of Missolonghi (1826) and Liberty Leading the People (1830) (Plates 29 and 30), in which he mixes conventional, classical allegory with realism: the leading women in these paintings are both antique ideal and fleshy reality. (This rejection of traditional boundaries and categories was a hallmark of the Romantic mindset.) Greece on the Ruins of Missolonghi commemorates the death in 1824 of Byron at M
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4 Additional resources

Click on 'View document' to read Grammar glossary (PDF, 0.1 MB).

View document.

Click on 'View document' to read Irregular verb table (PDF, 0.2 MB).

View document.

Click on 'View document' to read Phonectic alphab
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1.6.4 Blogs

The founder of Technorati claims that the number of ‘blogs’ doubles every five months and that the creation rate is approaching two per second. One estimate I read in July 2010 put the number at 400 million ‘blogs’. Because these online diaries offer instant publishing opportunities, you potentially have access to a wealth of knowledge from commentators and experts (if they blog
Author(s): The Open University

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2.1 The problems of iron uptake

Iron has a high natural abundance. It is the second most abundant metallic element by mass in the Earth's crust (7.1 per cent).

Activity 1

What are the main oxidation states of iron?

Author(s): The Open University

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Authentic Italian Pizza
A chef demonstrates how to make pizza.  He shows how to make the dough by mixing water, sugar, salt, spices, and then making a well out of flour and adding wet ingredients to it.  He then kneads the dough, and lets it rise.  He forms the crust and adds tomato sauce. 
(9:56)

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