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6.3.3 Photomultiplier tubes and detection circuitry

The visible photons are collected by an array of photomultiplier tubes behind the crystal. These convert each visible photon to an electron and then multiply the number of electrons sufficiently to give a voltage pulse. Because the number of visible photons is proportional to the energy of the incoming gamma ray, the height of the pulse depends on this energy. This gives a method of counting the numbers of gamma photons at different energies that reach the crystal.

A resistive network c
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Public Conversation with Professor Erica Chenoweth
Erica Chenoweth is Professor & Associate Dean for Research at the Josef Korbel School of International Studies at the University of Denver. Professor Chenoweth is an internationally recognised authority on political violence and its alternatives, in 2014 she received the 2014 Karl Deutsch Award, given annually to the scholar under the age of 40 who has made the greatest impact on the field of international politics or peace research. In this conversation she discusses her life, influences and re
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LA DÉTECTION DU RAYONNEMENT GRAVITATIONNEL 100 ANS APRÈS EINSTEIN (audio)

Les détecteurs d'ondes gravitationnelles de la collaboration LIGO/VIRGO ont observé les signaux gravitationnels de la coalescence de systèmes binaires de trous noirs stellaires massifs à des grandes distances en astronomie. Cette découverte majeure, 100 ans après la formulation de la relativité générale par Einstein, ouvre la voie à une nouvelle ...
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The Ocean Floor - by StudyJams
Earth's most magnificent and enormous landforms are all on the ocean floor.  Volcanoes and earthquakes change the ocean floor, creating new landforms.  Erosion on land also deposits minerals and animal matter on the ocean floor.  Learn more about the ocean floor with this slide show from StudyJams.  Vibrant photos are set to music, with information written under each photo.  A short, self-checking quiz is also provided with this link.
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Living in a warmer world - Jim Salinger
Jim Salinger delivered this summary lecture as part of a tour to promote his book, Living in a Warmer World. The lecture covered the broader topics of human-generated climate change and the specific impacts we could expect in our part of the world. The lecture was given at Otago on the 31st of October
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French Costume: J'en Accepte L'Heureux Presage
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5.13 The final Act

In Act 3, Dan and Ned are back in Ned's flat and Ned is showing extreme signs of neurosis and paranoia. Dan can no longer bear Ned's rather dark and erratic behaviour, and he grabs the conversation by suddenly pouring out all the overwhelmingly negative aspects of his life as a dentist, father and lover. Some people might say that ethics is about how to live a ‘good’ life and, clearly, Dan needs a change. He recognises he is not leading a ‘good’ life. He knows all the things
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Licensed under a Creative Commons Attribution - NonCommercial-ShareAlike 2.0 Licence - see http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ - Original copyright The Open University

Zoologists and Wildlife Biologists Career Information
This 1:33 video explains the differences in these two careers. It is fast paced and does a good job of providing students with an overview and insights into what is required
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2.1 Preliminaries

To talk about how human language works, we need to establish the meaning of some key terms. The study of language and languages is called linguistics, and linguistics relates closely to biological psychology, as we shall see. Linguists talk about the grammar of a language. By this they don't mean a set of rules about how people should speak. They mean the set of subconscious rules we actually use in formulating phrases and sentences of speech. In this sense, there is no such thing as b
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EN-12. What determines the quality of urban biodiversity ? (Vidéo)

Nathalie Machon presents some factors influencing the quality of the urban biodiversity: climate, soil features, age of the habitat, fragmentation and heterogeneity of the green areas... She concludes with recommendations to favour this biodiversity, focusing on the management of gardens and green spaces.


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Si un chemin est optimal, tous ses chemins partiels sont optimaux (Vidéo)

Nous cherchons à concevoir un algorithme capable de déterminer l'alignement optimal de 2 séquences. Et nous avons vu que ça revient à chercher un algorithme qui recherche un chemin optimal dans une grille. Chemin optimal, c'est-à-dire de coût de score minimal.
Pour bâtir cet algorithme, nous allons nous appuyer sur ...
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2.3.1 Analysis

  • Have as the starting point the student teacher's perceptions and concerns about the lessons.

  • Consider the evidence collected and impressions formed.

  • Identify the various strengths of the lesson. This is particularly important, as student teachers can become demoralised if the discussion concentrates only on their weaknesses and suggestions for change.

  • Identify those aspects that could usefully have been don
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2.2 Environmental pragmatism: positioning expert support

I believe that the principal task for an environmental pragmatism is not to reengage the … debates in environmental ethics but rather to impress upon environmental philosophers the need to take up the largely empirical question of what morally motivates humans to change their attitudes, behaviours, and policy preferences toward those more supportive of long-term environmental sustainability.

(Light, 2002, p. 446)


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1.6.7 Pantothenic acid (vitamin B5)

The name ‘pantothenic acid’ is derived from the Greek pantothen which means ‘from all sides’, indicating that it is widely distributed in the diet. It plays a vital role in metabolism, particularly in the production of energy in cells. Naturally occurring pantothenic acid deficiency is very rare, since it is so widespread in the diet. However, during World War II, prisoners in the Philippines, Burma and Japan suffering from severe malnutrition did experience numbness, tingling
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Introduction

Most of the literature on the policy process focuses on how policy is made: the processes of negotiation and bargaining that take place, the struggle between rationality and politics, and the tension between ‘top-down’ and ‘bottom-up’ approaches. This unit is concerned with a rather different set of dynamics: the relationship between policy and what actually happens in the process of delivery. Formal, sequential descriptions of the policy process relegate this phase to the idea of imp
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Learning outcomes

After studying this unit you will:

  • have developed a systematic understanding of knowledge and a critical awareness of issues in inclusive education;

  • be able to reflect critically upon and analyse your own perspective, and that of others, regarding inclusion;

  • be able to analyse and develop successful inclusive learning practices;

  • be able to identify conceptual frameworks appropriate for investigating inclusion issues, examining the inc
    Author(s): The Open University

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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

The Europeanisation Of French Politics
The Europeanisation Of French Politics
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Speaker(s): Isabel Hilton, Dr Leigh Jenco, Professor Jeffrey Wasserstrom | In China, history isn't just about the past - it shapes the future. With the rise of China over the past four decades, people increasingly look to China's turbulent modern history for clues about what the world will be like in the 21st century. The panelists will discuss how the newly published book, The Oxford Illustrated History of Modern China, addresses such questions through an examination of the broad sweep of mode
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4H bike rodeo

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Arabi Elementary Bike Rodeo
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Dimensions of the Global Food Crisis: Session 2
Associate Professor Bill Pritchard, Department of Geography, University of Sydney presents "'Rewriting the global food equation', but to what script? Priorities and strategic choices in addressing food insecurity within vulnerable population". 44th Otago Foreign Policy School - Salmond Hall, Dunedin, New Zealand. Friday 26 June to Sunday 28 June 2009.
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