2.1.3 Reflective diffraction gratings

Although the above description of diffraction has been in terms of light passing through a series of slits in a (transmission) diffraction grating, the type of grating which is currently most common in astronomy is a reflective diffraction grating or reflection grating. This again exploits the wave properties of light, in this case by making adjacent sections of a wavefront travel extra distances as it is reflected off a non-uniform surface. The non-uniform surface is actually a
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

MIT Commencement 2008 Part 1
Description not set
Author(s): No creator set

License information
Related content

Making Comparisons with Adjectives and Adverbs in Spanish
In this student-created video, two students explain using adjectives and adverbs to make comparisons in Spanish.  Many examples are given including irregular forms and use of adjectives and adverbs in sentences. ( 6:50)
Author(s): No creator set

License information
Related content

1.4 Extra help

If you are new to studying or haven't done this kind of thing for a long time, you may want more practice at reading and note taking than is provided here. There are additional materials that have been developed for use by any student and you may find these helpful. They are not specific to technology, so some of the examples they use might seem unfamiliar to you. They have been intentionally developed to suit students of any subject area. Click on the link below to view materials on taking n
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Greek far-right rally draws response in anti-fascism march
A rally by hundreds of supporters of Greece's far-right Golden Dawn, one of Europe's most ardent anti-immigrant parties, draws thousands to respond with an anti-fascism march on the same day. 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
Author(s): No creator set

License information
Related content

Nuclear Magnetic Resonance - Big Ben
Andrew Hall compares the sounds of bells to the frequencies of chemicals captured by a Nuclear Magnetic Resonance spectrometer. http://blogs.bath.ac.uk/csct/2016/a-chemical-chorus/
Author(s): No creator set

License information
Related content

Student Diversity Workshop 5
The varied viewpoints necessary for valuable class discussions are
celebrated in this program. The group talks about the diversity of their students and how their interactions with literature are shaped in part by their life experiences, unique thoughts, and previous reading
experiences. They examine the worth of using the lens of multiple
perspectives to examine a work of literature, and offer suggestions for ways to encourage each student to contribute to the ongoing class

Author(s): No creator set

License information
Related content

Making sense of the EU-Turkey deal
A panel discuss the deal between the EU and Turkey regarding immigration
Author(s): No creator set

License information
Related content

Relations

We shall use the symbol (known as tilde or twiddle) to represent a relation between two elements of a set.

Some texts use ρ, rather than Author(s): The Open University

License information
Related content

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

ESD.932 Technology Policy Organizations (MIT)
Technology Policy Organizations and its sequel, ESD.933, Technology Policy Negotiations and Dispute Resolution, form a sequence on Organizational Processes in Technology Policy. This course features an overall framework for understanding the increasingly networked, flat, flexible and diverse nature of organizations, as well as a close look at the many relevant types of organizations, including regulatory, entrepreneurial, multi-national, and non-governmental non-profit. Key organizational proces
Author(s): Cutcher-Gershenfeld, Joel

License information
Related content

Content within individual OCW courses is (c) by the individual authors unless otherwise noted. MIT OpenCourseWare materials are licensed by the Massachusetts Institute of Technology under a Creative C

¿Qué hora es? – Telling Time (part 3)
Some practice with telling time. This video starts out with a quick refresher quiz that you can pause and have the students answer in class. This video is a good one to use to review everything together and get some quick practice telling time. (2:21)
Author(s): No creator set

License information
Related content

1.8 Protein–protein interactions in signal transduction

Many signalling proteins have both a catalytic domain and sometimes several binding domains.Some only have binding domains, enabling their proteins to act as adaptor, scaffold or anchoring proteins to bring other proteins together. Because of this multiplicity of binding domains, signalling proteins can potentially combine to form complexes with many other proteins; these complexes may be either transient (e.g. in response to stimulation by a growth factor), or stable (to target a protein to
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

EHS 665/HBEHED 665: Communicating Science Through Social Media

Content Type: 
Course


Author(s): tkpaul

License information
Related content

Rights not set

3.4.7 Induced earthquakes

Some reservoirs cause earthquakes to occur. This is perhaps not so surprising, as earthquakes are caused by stress in rocks, and the addition of a large mass of water in a reservoir on top of the rocks at the Earth's surface stresses the rocks and can trigger an earthquake. Not all reservoirs induce earthquakes: it is in general only the larger reservoirs, or the deeper ones (over 100m deep), and only if the reservoir is built in an earthquake area, releasing stress already stored in t
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Open Notebook Science in 15 minutes
update: transcript is available

On October 10, 2008 Jean-Claude Bradley presented a 15 minute summary of Open Notebook Science and its application to the synthesis of anti-malarial compounds as part of a mini-symposium on faculty research in the Chemistry department

Author(s): No creator set

License information
Related content

5.5 Other forms of diabetes

By far the three most common types of diabetes are Type 1, Type 2 and gestational. There are other forms of diabetes but we will not be covering them in any more detail. These are forms due to:

  • disease of the pancreas (pancreatitis)

  • an excess of hormones that increase blood glucose levels, e.g. excess growth hormone

  • drugs, for example, steroid therapy, which tend to oppose the action of insulin

  • abnorm
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

4.1 Introduction

Nuclear power generation involves concentrated fissionable fuels which, after fission, leave significant quantities of fission-product isotopes, some of which are highly radioactive. Much of the criticism levelled against the industry falls under four main headings to which we have alluded in preceding sections:

  1. the operational safety of nuclear reactors;

  2. the biological effects of abnormal radiation levels arising from fuel transport,
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

This Week@Minnesota: 2011 Recap Part 1
In "This Week @Minnesota" for the week of Dec. 19-23, we take the first of a two-part look back at 2011. [Music courtesy Kevin MacLeod]
Author(s): No creator set

License information
Related content