Zn, cold rolled - mechanical twins
This sample was cold rolled. Zinc has a hexagonal structure so it contains only two independent slip systems. However, for slip to occur, five slip systems are required so zinc does not undergo general plasticity. Instead it forms mechanical twins as an alternative to dislocation motion to accommodate the deformation.
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
Cu 55, Zn 45 (wt%) brass, as cast, dendritic
A cast alloy of high zinc brass, consisting of β dendrites. The α precipitates out of solution at the crystal boundaries, forming a structure of β dendrites surrounded by α. This is known as a Widmanstätten structure because a geometrical pattern of α forms on certain crystallographic orientations of the β lattice.
Al 67, Cu 33 (wt%), eutectic alloy
This alloy is of the eutectic composition and has solidified with a lamellae eutectic structure. The Al and θ phases form co-operatively. The eutectic lamellae grows in the principal direction of heat flow; the lamellae structure is stabilised by the high temperature gradient. In the lower part of the micrograph the lamellae structure breaks down.
Grain growth in the shot model
The behaviour of the shot model as it is rearranged by tapping, starting from a polycrystalline state with many small grains and ending with much larger grains. Note the presence of vacancies in the structure. From TLP: Atomic Scale Structure of Materials, http://www.msm.cam.ac.uk/doitpoms/tlplib/atomic-scale-structure/index.php
Modeling grain growth with soap bubbles
A box containing some soap solution is used to simulate a grain structure. Rigorous agitation will produce an initial structure of many small bubbles (grains), whose evolution can be recorded. The soap film that separates bubbles has a surface energy, and the area of this will tend to be minimised.
Phase transformation from an isotropic liquid to a chiral nematic liquid crystal
Phase transformation (20x magnification, 3x speed) for an isotropic liquid to chiral nematic liquid crystal. Although nucleation begins in a similar fashion to the regular nematic, we can see the different regions merge with one another to form the final 'fingerprint structure' that is characteristic of chiral nematics with their helical axis parallel to the surface of the slide. From TLP: Liquid Crystals, http://www.doitpoms.ac.uk/tlplib/liquid_crystals/phase_transitions.php
Growth of a two-dimensional grain structure
A Voronoi diagram is created using Surface Evolver, from a random set of (N=1000) points to represent the grain structure. The boundary length is then minimised, subject to the constraint of constant area. The video shows the growth of a two-dimensional grain structure: From TLP: Grain growth, http://www.doitpoms.ac.uk/tlplib/grainGrowth/2dcomputersimulation.php
5.61 Physical Chemistry (MIT)
This course presents an introduction to quantum mechanics. It begins with an examination of the historical development of quantum theory, properties of particles and waves, wave mechanics and applications to simple systems — the particle in a box, the harmonic oscillator, the rigid rotor and the hydrogen atom. The lectures continue with a discussion of atomic structure and the Periodic Table. The final lectures cover applications to chemical bonding including valence bond and molecular orb
International Classification of Function, Disability and Health
This package was originally designed for undergraduates in Medicine at the University of Nottingham. It will also be useful to students in nursing, allied health professions and pharmacy. Practitioners in these fields, who are new to the ICF, will also find it a useful introduction. It describes the International Classification of Functioning, Disability and Health (ICF), a classification system published by the World Health Organisation to describe health status. This system is widely used in r
Ashes of Roses Evening Dress
'Ashes of Roses' synthetic chiffon dress, long batwing sleeves, deep cuffs fastened with five self-covered buttons. Bodice and skirt lined, sleeves unlined. Bodice is blouson style, skirt is full and cut in panels. Lining has long zip fastener, bodice back is secured with four self-covered buttons (slightly larger than those on cuffs). Neck is bound in chiffon, hem is overlocked. - from the The Betty Smithers Design Collection at Staffordshire University.
Carbon-carbon composite
Carbon-carbon composites are manufactured from continuous carbon fibres which are woven in a two or three dimensional pattern. The fibres are then impregnated with a polymeric resin. After the component has been shaped and cured the matrix is pyrolysed by heating in an inert atmosphere. This converts the matrix to carbon chain molecules which are densified by further heat treatments. The resulting composite consists of the original carbon fibres in a carbon matrix. Carbon-carbon composites have
Carbon-carbon composite
Carbon-carbon composites are manufactured from continuous carbon fibres which are woven in a two or three dimensional pattern. The fibres are then impregnated with a polymeric resin. After the component has been shaped and cured the matrix is pyrolysed by heating in an inert atmosphere. This converts the matrix to carbon chain molecules which are densified by further heat treatments. The resulting composite consists of the original carbon fibres in a carbon matrix. Carbon-carbon composites have
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
Dissolved Oxygen and Biochemical Oxygen Demand
This EPA website provides general information about dissolved oxygen, including what it is, sampling and equipment considerations, and sampling and analysis protocols. The site also features a chart of dissolved oxygen solubility as a function of temperature.
Article :: Adobe® Flash® Catalyst™ CS5 Classroom in a Book: Preparing a Design Documen
The way you approach the design and organization of your artwork has a significant impact on the structure of the project in Flash Catalyst and the underlying code. This excerpt from Adobe® Flash® Catalyst™ CS5 Classroom in a Book will help protect the integrity of your design and minimize re-working or re-structuring assets after bringing them into Flash Catalyst.
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
6.912 Introduction to Copyright Law (MIT)
This course is an introduction to copyright law and American law in general. Topics covered include: structure of federal law; basics of legal research; legal citations; how to use LexisNexis®; the 1976 Copyright Act; copyright as applied to music, computers, broadcasting, and education; fair use; Napster®, Grokster®, and Peer-to-Peer file-sharing; Library Access to Music Project; The 1998 Digital Millennium Copyright Act; DVDs and encryption; software licensing; the GNU® General
21W.765J Interactive and Non-Linear Narrative: Theory and Practice (MIT)
This course covers techniques of creating narratives that take advantage of the flexibility of form offered by the computer. The course studies the structural properties of book-based narratives that experiment with digression, multiple points of view, disruptions of time and of storyline. The class analyzes the structure and evaluates the literary qualities of computer-based narratives including hypertexts, adventure games, and classic artificial intelligence programs like Eliza. With this base
11.301J Introduction to Urban Design and Development (MIT)
This course examines both the structure of cities and ways they can be changed. Its scope includes historical forces that have produced cities, models of urban analysis, contemporary theories of urban design, and implementation strategies. Core lectures are supplemented by discussion sessions focusing on student work and field trips. Guest speakers present cases involving current projects illustrating the scope and methods of urban design practice.
