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Éviter la récursivité : une version itérative (Vidéo)

La fonction récursive que nous avons obtenue est d'un code assez compact et plutôt élégant, mais effectivement peu efficace. Pourquoi ? Rappelons son fonctionnement. Cette fonction est d'abord appelée pour calculer le coût de ce nœud-là. Nécessitant le coût optimal de ce nœud, celui-ci et celui-là, elle est ré appliquée, ...
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3.4 Stereoscopic vision

DA explains that ancestral monkeys had to 'decide whether a branch was within reach of a stretch or a jump - or beyond either' [p.248]. Individuals that were able to judge distances between themselves and branches more accurately had a competitive edge over other individuals, which led to the development in primates of stereoscopic vision. Stereoscopic vision evolved convergently in carnivores that judge distances to capture fast-moving prey.

The field of view of a single eye is termed
Author(s): The Open University

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A new world order
Kevin Roberts, CEO of Saatchi & Saatchi, believes we are seeing not a global recession but a global catastrophe and a radical restructuring of the world. The leaders who emerge from this will be those who are able to emotionally inspire others, and re-introduce trust in a world of uncertainty and fear; they will be able to capture the power of language, they will be, like Barack Obama, the storytellers. Kevin Roberts explains why he believes the revolution will begin with language.
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Representing Reflective Practice in a Remote Design Collaboration Process
This paper addresses a new method to describe the remote collaborative design process from the perspective of reflective practice. We aim at understanding the mutual effect between internal and external structures in remote collaborative design. According to the cognitive coding scheme of Suwa et al., we encoded the process into a set of indices?new, continual and revisited?that describe each primitive design move. In a case study which involved the authors as design collaborators, we identified
Author(s): Abdelmohsen, Sherif; El-Khouly, Tamer

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4.2 The terrestrial carbon cycle

Figure 1.10 shows the rates of natural carbon exchange between the terrestrial system and the atmosphere.

A Revolution in the Energy Sector
2014 University of Virginia Investing Conference Robert S. Craine, President and Founder of Lynx Production Company Inc. and Lynx LNG LLC, and W. Barnes Hauptfuhrer, Chief Executive Officer of Chapter IV Investors LLC, join Professor Elena Loutskina in the Darden School of Business studio to discuss hot topics in the energy sector, including the shale gas revolution. Mr. Craine and Mr. Haupthfurer spoke at the 7th Annual University of Virginia Investing Conference at the Darden School of Busin
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1.4.1 Introduction

Up to now I have focused on the claims of the antisweatshop movement and the counter-claims of those who contest the purely negative conclusions drawn about the exploitation of another country's poor. To that end, I have, at various moments, touched on issues of demands to take responsibility: whether, for instance, responsibility for sweatshops should be divided up in some way between all those connected to the market system which gives rise to them, or placed firmly at the door of the big r
Author(s): The Open University

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English & Linguistics: An Evening with Doug Johnstone
The rising star of Tartan Noir, Scottish author Doug Johnstone reads from his new novel, 'Gone Again' (Faber, 2013), answers questions from the audience and even sings a few songs. Doug Johnstone's previous novel was described as "a great slice of noir" by Ian Rankin, and "a grisly parable of our times" by Irvine Welsh. 28 August 2013
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To Model or Not to Model? Formalizing the Conceptual Modeling Thought Process to Benefit Engineers a
Conceptual modeling began informally. As human beings evolved and began to make sense of the world, many constructed mental models of themselves as agents in a hostile environment. These models enabled them to make predictions and test hypotheses about behaviors that might increase their survival rate. Similarly, engineers today develop mental models of the systems they design, and scientists construct such models to understand, explain, and predict natural phenomena. Conceptual models are bo
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Did Tariffs Make America Great?

A
A
Tags Money and BanksU.S. History
Home |
Author(s): Mises Institute

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1 Hibernation and torpor: An introduction

This course examines hibernation, a special form of adaptation that animals can make to the ecological demands of remaining in a chosen habitat in winter. Hibernation is a state which enables energy-efficient survival when ambient temperatures are so low that foraging or simply maintaining normal core body temperature and basal metabolic rate are either energetically too costly or impossible.

Polar endotherms can maintain a high T b even when living actively at sub-ze
Author(s): The Open University

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Sommen oefenen via een doolhof : Lesidee
doolhof.png

Een lesideetje waarbij leerlingen sommen oefenen via een doolhof.

De leerlingen moeten de ridder naar zijn kasteel brengen. Ondertussen komen ze sommen of vermenigvuldigingen tegen. Deze moeten ze oplossen en de uitkomst in de vakjes bovenaan …


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Further reading

Doblhofer, Ernst, Voices in Stone (Paladin, 1973; orig. edn. 1957). Not especially mathematical, but a good account of the decipherment of hieroglyphs and cuneiform texts if you want to follow that up.
Flegg, Graham, Numbers (Penguin, 1984; orig. edn. 1983). A book packed with much more information about numbers and their history than we have time for during the course.
Author(s): The Open University

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2.1 Political responses to climate change and the environment

Not for the first time in this book, you are faced with a term that is important but difficult to define precisely. Although the fact that plenty of people from different standpoints are using the term ‘globalisation’ is some measure of its importance, it can be confusing to find that there are different ways of framing what it means for humans and the environment today and in the future. In this section, the range of political responses to climate change and environment–economy interac
Author(s): The Open University

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This Sahara Railway Is One of the Most Extreme in the World | Short Film Showcase
At more than 430 miles long, the Mauritania Railway has been transporting iron ore across the blistering heat of the Sahara Desert since 1963. (12:49)
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London College of Fashion : Cordwainers College historic shoe collection
This database is a resource of approximately 650 digital images of historic shoes (1780s-1990s) and associated tools from the Cordwainers College Historic Shoe Collection. The shoe collection was built up as a teaching aid, and it consists mainly of women's shoes with some men's and a few children's, the majority being British 'fashion' footwear with some orthopaedic, some prize and exhibition work, lasts and shoemaker's tools and some ethnic footwear. A number of items are unfinished, or cut to
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"Kafka Comes to America: Fighting for Justice in the War on Terror"
wax book cover"Our government can make you disappear." Those were the words Steven Wax never imagined he would hear himself say. In his twenty-nine years as a public defender, Wax had never had to warn a client that he or she might be taken away to a military brig, or worse, a "black site", one of our country's dreaded secret prisons. How had our country come to this? The disappearance of people happens in places ruled by t
Author(s): The Center for International Studies at the Univer

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1.3.2 β pleated sheets

Another common secondary structure is the β pleated sheet, which contains extended stretches of polypeptide chain with hydrogen bonds between neighbouring strands. In parallel β pleated sheet, polypeptide strands run in the same direction (i.e. from N- to C-terminus) whereas in antiparallel β pleated sheet, neighbouring strands extend in opposite directions (Author(s): The Open University

3.5.2 Bacteria

Bacteria are organisms of special significance to the study of clean and polluted waters because they break down organic matter. While most of them are not harmful to humans, some bacteria (e.g. Clostridium) are pathogenic. Most bacteria are retained on a filter of pore size 0.45 μm and all bacteria are trapped on a filter of 0.22 μm. They are important in sewage treatment, and in solid waste disposal. They are extremely abundant in almost all parts of the aquatic en
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