Grey cast iron
Cast iron with a high carbon content is referred to as grey cast iron since the carbon is present in the form of graphite flakes giving rise to a grey colour when viewed. This form of cast iron has several technologically useful properties such as good machinability, low melting temperature, good wear resistance and good mould reproduction.
Silal
This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite w
Grey cast iron
Cast iron with a high carbon content is referred to as grey cast iron since the carbon is present in the form of graphite flakes giving rise to a grey colour when viewed. This form of cast iron has several technologically useful properties such as good machinability, low melting temperature, good wear resistance and good mould reproduction.
As cast white cast iron
An example of a white cast iron, so named due to its relatively low carbon content, which means that the carbon present is in the form of cementite. Upon cooling the melt initially forms austenite dendrites and ledeburite. The dendrites then transform to pearlite, and the ledeburite to ferrite and cementite.
21H.466 Imperial and Revolutionary Russia: Culture and Politics (MIT)
At the beginning of the eighteenth century Russia began to come into its own as a major European power. Members of the Russian intellectual classes increasingly compared themselves and their autocratic order to states and societies in the West. This comparison generated both a new sense of national consciousness and intense criticism of the existing order in Russia. In this course we will examine different perspectives on Russian history and literature in order to try to understand the Russian E
Energy resources: solar energy
Energy from sources other than fossil and nuclear fuels is to a large extent free of the concerns about environmental effects and renewability that characterize those two sources. Each alternative source supplies energy continuall, whether or not we use it, and most have their origins in energy generated outside the Earth, yet the potential of each is limited by its total supply set against its rate of use. The Sun will radiate energy until it ceases thermonuclear fusion, in around 5 billion yea
Cu 21, Sn 79 (wt%), peritectic transformation
This microstructure is generated via a peritectic′s reaction (L+ε = η), which bears some similarities to the more familiar eutectic reaction (L = α+β). Upon cooling from the liquid phase field, primary ε is formed, which can be seen here as a slightly darker phase than the sheath of η surrounding it. The η sheath is the product of a peritectic reaction between ε and liquid. The peritectic reaction rarely goes to completion, si
As-cast wrought-grade aluminium alloy
The micrograph shows Al-Mg-Fe-Si containing < 1wt.% of each solute. No addition of grain refinement particles (e.g. TiB2). This micrograph illustrates one of the possible growth morphologies that a solidifying metal can adopt (c.f. micrograph 712). The dendritic structure is the result of instabilities in the solid-liquid interface during growth due to the rejection of solute into the liquid phase. Dendritic grains are more prevalent in alloys of high solute content and larger grain sizes.The Ba
Entrepreneurship (undergraduate level)
As you read this, the managers of a new high-tech company, Optasite Inc., are striving to achieve the entrepreneurial dream. On a special website (www.amherst.umassonline.net) you will follow that company, and see their progress week by week. But you will do more than just watch. You will be actively engaged with the company, analyzing its problems, and making input. You will be participating in the world's first in-depth, real-time case study. Specific content will include the business plan, co
Skills needed for Project Management
This is the packaged content for a learning activity reflecting on the strengths and weaknesses of your own skills that could be relevant to project management
SCY-Science created by you: un environnement en ligne pour apprendre par l'investigation et la conce
Le projet SCY a pour objectif de mettre en place un environnement informatique novateur pour l'apprentissage des sciences par diverses démarches telles l'investigation, la conception, le jeu ou la collaboration. Le public visé est les élèves de collège et de lycée (12-18 ans). L'objectif de la communication est de présenter la mission 1 : "concevoir une maison qui émet peu de CO2" à l'aide de la plateforme SCY-Lab.
Article :: Using the Dreamweaver CS5 HTML5 Pack to Create CSS3 Transforms
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Article :: Adobe Acrobat 9 How-To #56: Selecting and Editing Text in a PDF
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Nottingham U-Now
University of Nottingham, Modern Languages and Cultures resources
8.02X Physics II: Electricity & Magnetism with an Experimental Focus (MIT)
This course is an introduction to electromagnetism and electrostatics. Topics include: electric charge, Coulomb's law, electric structure of matter, conductors and dielectrics, concepts of electrostatic field and potential, electrostatic energy, electric currents, magnetic fields, Ampere's law, magnetic materials, time-varying fields, Faraday's law of induction, basic electric circuits, electromagnetic waves, and Maxwell's equations. The course has an experimental focus, and includes several exp
6.828 Operating System Engineering (MIT)
6.828 teaches the fundamentals of engineering operating systems. The following topics are studied in detail: virtual memory, kernel and user mode, system calls, threads, context switches, interrupts, interprocess communication, coordination of concurrent activities, and the interface between software and hardware. Most importantly, the interactions between these concepts are examined. The course is divided into two blocks; the first block introduces an operating system, xv6, which runs on x
