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3.3 Petrochemical intermediates and monomers

About 80 per cent of all petrochemicals end up in polymers, the most important building blocks being ethylene, propylene, butadiene and benzene. The first three can be polymerized directly but an important slice of their production is used to create more complex monomers. Ethylene is the progenitor of most vinyl monomers (Figure 35), so the pressure on ethylene supply is particularly strong compared for example to propyle
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3.2.2 Ethane cracking

Although ethane can be cracked thermally, the reaction is slow and does not necessarily yield ethylene at high severity. Careful control of reaction conditions, however, allows the reaction to occur

The yield of ethylene is typically nearly 50 wt% with the rest composed of unreacted ethane (40 per cent) and some methane and hydrogen (10 per cent). T
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3.2.1 Thermal cracking

The bulk of the major monomer and intermediate, ethylene (C2H4), is still produced in the UK by steam cracking without the use of catalysts. Paraffinic feedstocks are best for optimising ethylene yields, and the severity of cracking is specified by the rate of disappearance of a marker compound, usually n-pentane. The severity of the reaction can then be defined as follows:

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2.1.1 Memorising
How do we learn? Understanding ‘how’ is the key to learning more effectively. This unit looks at the three main categories of theories: the acquisitive, constructivist and experiential models of learning. There is no right way to learn but developing an active approach will ensure that you are open to new ideas.
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2 1 Different conceptions of learning
How do we learn? Understanding ‘how’ is the key to learning more effectively. This unit looks at the three main categories of theories: the acquisitive, constructivist and experiential models of learning. There is no right way to learn but developing an active approach will ensure that you are open to new ideas.
Author(s): The Open University

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1.3 The realities of war – a protest
In this unit we will consider how language can be used in different ways for different purposes. To do this we will use the theme of memorial and commemoration. In the first section we briefly discuss the life of the poet Siegfried Sassoon before examining both his poetry and prose. Through this we will see how he conveys meaning in different ways for different audiences using different forms. Following this we discuss more generally how different meanings can be conveyed using prose and poetic
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9.7 Debate 4: representation of Scotland
Sunset Song was written in the early 1930s and is still one of the best-known and most-debated Scottish novels. In this unit, we discuss whether Sunset Song succeeds as critique of capitalism and whether it has value as a work of literature separate from its propagandistic ambitions.
Author(s): The Open University

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8.2 Reviews of the first edition
Sunset Song was written in the early 1930s and is still one of the best-known and most-debated Scottish novels. In this unit, we discuss whether Sunset Song succeeds as critique of capitalism and whether it has value as a work of literature separate from its propagandistic ambitions.
Author(s): The Open University

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Financial Markets
Financial institutions are a pillar of civilized society, supporting people in their productive ventures and managing the economic risks they take on. The workings of these institutions are important to comprehend if we are to predict their actions today and their evolution in the coming information age. The course strives to offer understanding of the theory of finance and its relation to the history, strengths and imperfections of such institutions as banking, insurance, securities, futures, a
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Introduction to Political Philosophy
This course is intended as an introduction to political philosophy as seen through an examination of some of the major texts and thinkers of the Western political tradition. Three broad themes that are central to understanding political life are focused upon: the polis experience (Plato, Aristotle), the sovereign state (Machiavelli, Hobbes), constitutional government (Locke), and democracy (Rousseau, Tocqueville). The way in which different political philosophies have given expression to various
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Computer Games and Simulations for Investigation and Education, Spring 2005
Project-based subject in which students from multiple disciplines are encouraged to develop and investigate systems and ideas from their fields of study as they explore the process of building and testing models and simulations. Explores various modeling software packages, criteria for developing the most appropriate simulation for a given situation, and methods for evaluating the success and utility of models. Students with an education focus consider what and how people learn from simulations,
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Module 7: Short-term Financing
This area of financing provides many options for an exporter and in some cases desirable financing options for an importer. It is important to remember that all options carry risk and the greater the risk the higher the cost. When evaluating risk, the associated costs must be a factor in the cost equation. The financing tools that have been presented in other sections merge at this point into potential financing options. MSU Global has teamed with experts in the international finance field to c
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Adult learners drop to lowest level under Labour
Newspaper article citing evidence from the Learning as Work TLRP research project,1740,1737,1726,24
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Timelines and Afghanistan
General Petraeus expresses confidence that Afghan security forces are on track to take on security for their country. Deborah Lutterbeck reports.
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IL CORPO COME POTENZIALITA’ SIMBOLICA ED ESPRESSIVA NELLA RICERCA ARTISTICA CONTEMPORANEA
IL CORPO COME POTENZIALITA’ SIMBOLICA ED ESPRESSIVA NELLA RICERCA ARTISTICA CONTEMPORANEA,Istituzione universitaria di secondo e terzo livello (ciclo II e III) per la formazione degli insegnanti e/o dei formatori,Progettare,Spiegare,Alta formazione universitaria (secondo e terzo livello),Ente ministeriale a supporto dell'innovazione e della valutazione del sistema educativo/formativo,Storia dell'arte,Teoria dell'arte,Misto (blended),Interazione con il contenuto,Guidato,Risorsa per studenti,App
Author(s): Nonveiller, Giorgio

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7.2 Developing a strategy
Skills in information technology (IT) cover a broad range, from using software packages effectively to developing a critical understanding of the strengths and weaknesses of IT solutions. Developing your IT skills means planning your work, practising your skills, seeking feedback from others and reviewing your approach. In developing and assessing your IT skills, you will learn to use and adapt your skills effectively and confidently in different situations and contexts. This unit is designed to
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Frontiers and Controversies in Astrophysics
This course focuses on three particularly interesting areas of astronomy that are advancing very rapidly: Extra-Solar Planets, Black Holes, and Dark Energy. Particular attention is paid to current projects that promise to improve our understanding significantly over the next few years. The course explores not just what is known, but what is currently not known, and how astronomers are going about trying to find out.
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Ping 84: Visual Search WP7 apps, Kinect Art, Lync, Facebook & Office

On this episode of Ping, Laura is joined by special guest Adam DePue to give their insight into the top stories from Microsoft this week. Here's a sampling of the dishes served:

Facebook & Office

Visual search for WP7 apps- COOOL!
Author(s): Laura Foy

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Open Wide and Trek Inside
Open Wide and Trek Inside has several objectives. The first is to help students understand major concepts related to oral health. By focusing on the science of the oral environment, the module goes beyond the traditional "brushing and flossing" curriculum and presents to students the ways science has helped people understand how to take proper care of their mouths and the structures within. The second objective of the module is to engage students in the nature of science through inquiry. As st
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