2.1.2 Diffraction and interference of light

When light, or indeed any type of wave, passes through a narrow aperture, it will spread out on the other side. This is the phenomenon of diffraction. For example Figure 17 shows the diffraction of water waves in a device called a ripple tank. The extent to which waves are diffracted depends on the size of the aperture re
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Juf Jannie : Kinderboerderij
jufjanniekinderboerderij.jpg

Juf Jannies kinderboerderij is een thematische, educatieve woordenschatapp voor kinderen van 1 tot 7 jaar rond verschillende gevisualiseerde thema’s waarin kinderen heel wat nieuwe woorden tegenkomen.
De bewegende beelden en …


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Google Scholar Can be a Starting Point for Research
A colleague once said that students can't use Google for research, because they don't know how to search properly. She was primarily concerned that inexperienced researchers do not know how to identify legitimate online resources. Google Scholar solves this problem by providing books, articles and even legal documents on virtually any subject. (There is no sound.) (01:53)
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1.1 Abbreviations used within this unit

While reading this subject you may come across the following abbreviations.

AAL – ATM adaptation layer

API – application program interface

ARP – address resolution protocol

ATM – asynchronous transfer mode

B-ISDN – broadband ISDN

CLP – cell loss priority

DNS – domain name system

FTP – file transfer protocol

HTTP – hypertext transfer protocol


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Know Learn how to read ABC Alphabet
Alphabet - watch this video again and again, your kids will familiar with ABCD within a week. It shows the kids their ABC's
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1.5.2 Ways of organizing yourself

How do you organize yourself?

Activity 12

Make a note of how you organise your:

  • emails

  • internet bookmarks or favorites

  • computer files


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2.3 Computer systems

So far, I have introduced the major components of a computer, namely a processor along with input and output devices, plus main and secondary memory. I now want to explore three of these components a little further, starting with input devices.

Input devices have to collect some information from outside the computer and present it to the computer as data which is in a form the processor can work with. (Strictly speaking, ‘data’ is the plural of the Latin word ‘datum’. But in the
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2.2.2 Hollow tubing surfaces

In their doughnut-shaped representation, toruses can be thought of as being hollow tubes. Many other surfaces in space can also be drawn as if they were made of hollow tubing. Figure 15 shows two such examples.

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6 Thermoregulation and mammalian fur

A coat of profuse mammalian body hair is commonly called fur. Fur provides insulation, which is a property that one first thinks of as useful for mammals to help retain body heat. Fur is a unique and fundamental feature of mammals, though not all living species possess it.

Question 12


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Evaluating Web Sites Tutorial
This tutorial covers how to evaluate websites for credibility. It discusses the differences between the different domains and how to check to get the best information.
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1.2.1 What evidence are we reading?

Although we live in a society where a huge amount of information is available in the form of numbers, some of us still feel a mental fog descend when we are asked to deal with them. This is because numerical information is information in a very condensed and abstract form. A number on its own means very little. You have to learn to read it. Numeracy (the ability to work with numbers) is a skill that we can learn. It is a very useful skill, because it allows us to understand very quickly the <
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LCS Litigation Panel
Professional litigators discuss the types of things they do in their daily work. Panelists represent both public and private sectors.
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Repatriation and returning remains
19th Century philosopher Jeremy Bentham allowed his body to be put on public display after he passed on but would you allow your body to be displayed after you die? The following video and audio collection examines specific cases in which the issue of display and ownership are raised and explores how museums have handled this question. Experts share reasons for their beliefs regarding repatriation and refer to specific examples on the topic of whether remains should be returned to their country
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Except for third party materials and otherwise stated (see http://www.open.ac.uk/conditions terms and conditions), this content is made available under a http://creativecommons.org/licenses/by-nc-sa/2

5.1 The medical background

Blood pressure is normally tightly controlled in the face of large variations in blood flow required by activities such as vigorous exercise. The diameter of the blood vessels is under the influence of the so-called sympathetic nervous system. Impulses from the brain stimulate the release of a chemical substance, noradrenaline (1), from the nerve-endings close to the vessel walls. The noradrenaline then diffuses to the blood vessel wall, where it interacts with a specific molecular sit
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Dave Mckean Draws For Fans
Dave McKean draws a picture for fans at Comicon in Naples, Italy.  This clip is busy with lots of background noise and talking and poor lighting but the camera stays focused on the drawing he is making.

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The Dark Ages
This three-minute video is about the the second century A.D. when the Roman Empire was the beacon of learning, trade, power and prosperity in the western world. It shows some images that may be offensive to some. Not much depth in terms of data, but it does paint a picture of what life was like. (03:05)
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How the Body Works : The Spleen
This is a brief video with narration spleen is a small organ located behind the stomach in the left, upper part of the abdomen.
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5.1 Energy services

Except in the form of food, no one needs or wants energy as such. That is to say, no one wants to eat coal or uranium, drink oil, breathe natural gas or be directly connected to an electricity supply. What people want is energy services – those services which energy uniquely can provide. Principally, these are: heat, for warming rooms, for washing and for processing materials; lighting, both interior and exterior; motive power, for a myriad of uses from pumping fluids to lifti
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3.4 The importance of understanding attitudes

One of the most important phenomena for a social marketer to understand is that of ‘attitudes’. Having said this, this is not a straightforward issue as there is much disagreement about the nature of attitudes, how they are formed, and how they determine our behaviour. Attitude theory research is a key focus for consumer behaviour theorists and derives from the field of psychology.

There are many definitions of attitude, for example, ‘the predisposition of the individual to evalua
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4.4 Manchester Literary & Philosophical Society and Board of Health

In the meantime Owen joined the town's social and intellectual elite, which like its politics was largely dominated by Dissenters. They were prominent in the Manchester Literary & Philosophical Society which Owen joined in 1793. There he associated with some significant reformers, heard papers on a wide range of intellectual, industrial and social topics, and himself presented papers dealing with such issues, including one on education.

The society was founded in 1781, the co-founders b
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