Cu 21, Sn 79 (wt%), peritectic transformation
This microstructure is generated via a peritecticÃ¢â‚¬Â²s reaction (L+ÃŽÂµ = ÃŽÂ·), which bears some similarities to the more familiar eutectic reaction (L = ÃŽÂ±+ÃŽÂ²). Upon cooling from the liquid phase field, primary ÃŽÂµ is formed, which can be seen here as a slightly darker phase than the sheath of ÃŽÂ· surrounding it. The ÃŽÂ· sheath is the product of a peritectic reaction between ÃŽÂµ and liquid. The peritectic reaction rarely goes to completion, si
Fe, C 0.3 (wt%) steel, spheroidised carbide
A hypoeutectoid alloy (composition less than eutectoid). The first phase formed upon cooling from the austenite phase field is proeutectoid ferrite. Due to the lower solubility of carbon in ferrite, carbon is partitioned into the remaining austenite. At the eutectic point the remaining carbon-enriched austenite transforms to pearlite (a mixture of ferrite and cementite), which is the darker region of the micrograph. The proportion of pearlite is dependent upon the overall composition.Subsequent
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
Optical Tweezers and Applications
Did you ever imagine that you can use light to move a microscopic plastic bead? Explore the forces on the bead or slow time to see the interaction with the laser's electric field. Use the optical tweezers to manipulate a single strand of DNA and explore the physics of tiny molecular motors. Can you get the DNA completely straight or stop the molecular motor?
Lecture 5: William Froude - A Sacred Duty to Doubt
David Brown on "William Froude - A Sacred Duty to Doubt". William Froude was born in 1810, and in 1861 published the first theory of ship rolling. This led to studies of powering. Using models he showed that there was no one ideal form and models tested at the corresponding speed could predict accurately the performance of ships; the basis of all later tank testing.
How Courage and Care Transformed a High School
Strawberry Mansion was considered one of America’s most dangerous high schools until determined and compassionate leadership turned it around.
Internet Technology and Lifelong Learning
This is a text version of an online distance-learning course produced in 2004. It is deposited here now (July 2009) for archive purposes. It was originally intended for the professional development of staff involved in any way with the management, design and delivery of lifelong learning. It may be of interest to producers of new courses in this field, or to future historians of technology, or simply to educators who may like to be reminded of how different things were in 2004. Author: Martin Co
Internationalising the Curriculum: an annotated bibliography
This annotated bibliography comprises a selection of books, journal articles, conference papers and other resources on the subject of the internationalised curriculum. It has been compiled initially from a library of global sources originally brought together as part of the review of literature in the field, commissioned by the Higher Education Academy in 2006 (Caruana, V. and Spurling, N., 2007). This has been up-dated to include more recent work. The central criterion for selection of material
Internationalisation good practice: The inclusive curriculum and ‘Internationalisation at Home’
This theme includes papers and articles which explore the meanings attributed to key phrases and attempt to define key concepts within the field of internationalisation as it relates specifically to learning, teaching and assessment practice and curriculum design and delivery in higher education. Many contributions provide concrete examples of activities to support multicultural learning and embed international dimensions in curricula. The student voice is apparent in research that engages stude
14.147 Topics in Game Theory (MIT)
This course/workshop aims to provide an invigorating intellectual environment for graduate students and junior faculty who are interested in economic theory. We will discuss research ideas and explore topics in game theory and more broadly in economic theory.
Croatia accuses Serbia of genocide
Croatia accuses Serbia of genocide in Eastern Croatia in the early 1990s, as hearings in the case begin at the International Court of Justice. Sarah Toms reports. Subscribe: http://smarturl.it/reuterssubscribe More Breaking News: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, financial, national, and international news. For
Understanding illiteracy is all in the eyes
McMaster's Victor Kuperman uses innovative eye-tracking technology to better understand why some people have difficulty reading.
World Voice Day 2014
Duke Voice Care Center hosted their 8th annual World Voice Day Celebration April 27, 2014 at the North Carolina Museum of Art. They honored the band Delta Rae with the 2014 Patrick D. Kenan Award for Vocal Health and Wellness. After their performance, the bandparticipated in a panel discussion, and shared their habits for keeping their voices healthy. The audience had many opportunities to learn about how the voice works, what types of problems can occur with the voice, and tips for vocal heal
It is necessary to form a stable dispersion of nanotubes in order to properly integrate them into polymeric systems. This can be achieved by treating them with acid to oxidise the tube surfaces. The tubes will then spontaneously disperse in an aqueous medium. The viscosity of these suspensions is analogous to that of polymers; it increases gradually with concentration up to a critical point (at about 0.7 vol%) where entanglement occurs. However, their separation is determined more by surface
Predicting Future Climate Reading List
Predicting Future Climate - Reading List - Part One of Future Climate Change
Unreal Developers Kit level and demo bridge video tutorials
These are video tutorials showing the use of the free UNREAL Developer Kit (http://www.udk.com/) These videos show examples for creating new levels using the games engine, and importing meshes from other 3d modeling programmes. This is a link to where the videos can be viewed as a presentation. The included videos and associated example files are available to download from JorumOpen as: ‘Unreal Developers Kit level video tutorial’ and ‘Unreal Developers Kit demo bridge video tutoria
Rockets fire in Syria
Subscribe: http://smarturl.it/reuterssubscribe June 17 - Videos posted on a social media website purport to show fighting continuing between Syrian rebels and pro-Assad forces in Deraa and Aleppo. Gavino Garay reports. More from Syria: http://smarturl.it/SyriaAttack Subscribe: http://smarturl.it/reuterssubscribe Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including busin
We have a talk-show host, a foreign expert and the foreign expert's translator.