Pay Attention to the Penguins
Think of penguins as ocean sentinels, says Dee Boersma -- they're on the frontlines of sea change. Sharing stories of penguin life and culture, she suggests that we start listening to what penguins are telling us. Dee Boersma considers penguins ocean sentinels, helping us understand the effects of pollution, overfishing and climate change on the marine environment. Run time 15:09.
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Radio Lingua Network News: 5 September 2008
The latest news from Radio Lingua including details of Coffee Break Spanish arrangements, new podcasts launched this autumn and the Radio Lingua video contest in which you can win an iPod.
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8.2 Wet etches: acids and bases

The simplest etches use a liquid solvent that converts the material into a soluble compound or a gas. Unfortunately, most materials used in micro-devices have few soluble compounds, so some very aggressive chemicals are needed to attack them. Here is a list of some of the most commonly used ones:

  • Hydrofluoric acid (chemical formula HF) is used to convert silicon dioxide into water-soluble H2SiF6 (plus some hydrogen and water). It
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בדיקה

Video link (see supported sites below). Please use the original link, not the shortcut, e.g. www.youtube.com/watch?v=abcde

Author(s): Taltola

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SP.2H3 Ancient Philosophy and Mathematics (MIT)
Western philosophy and theoretical mathematics were born together, and the cross-fertilization of ideas in the two disciplines was continuously acknowledged throughout antiquity. In this course, we read works of ancient Greek philosophy and mathematics, and investigate the way in which ideas of definition, reason, argument and proof, rationality and irrationality, number, quality and quantity, truth, and even the idea of an idea were shaped by the interplay of philosophic and mathematical inquir
Author(s): Perlman, Lee

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3.2 Some general properties of galaxies

Firstly, we note that galaxies tend to occur in clusters rather than singly. The mutual gravitational attraction of galaxies naturally tends to hold them on paths that remain close to each other. Typically a cluster contains tens or hundreds of galaxies. There are, however, large clusters with thousands of galaxies, and there are some solitary galaxies. Our own Galaxy is a member of a smallish cluster of about 36 galaxies called the Local Group (see Author(s): The Open University

3.016 Mathematics for Materials Scientists and Engineers (MIT)
This course covers the mathematical techniques necessary for understanding of materials science and engineering topics such as energetics, materials structure and symmetry, materials response to applied fields, mechanics and physics of solids and soft materials. The class uses examples from the materials science and engineering core courses (3.012 and 3.014) to introduce mathematical concepts and materials-related problem solving skills. Topics include linear algebra and orthonormal basis, eigen
Author(s): Carter, W. Craig

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USAWC celebrates Army Birthday
With a loud and thunderous, "Hooah," and a mighty, but controlled, swing of a 1902 cavalry saber replica, the U.S. Army War College cut a ceremonial cake and celebrated the Army's 237th Birthday by honoring Soldiers, veterans, and civilians and family members past and present today at the Army Heritage and Education Center.
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HMS Broadsword EAW582726

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HMS Broadsword (F88) off Plymouth. July 1990. This Type 22 frigate of the Royal Navy was commissioned in 1979. She was sold to the Brazilian Navy in 1995. Aerofilms Collection.
© Historic England


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7.3.4 Physical vapour deposition (PVD), sputtering

An ion hitting a metal surface after acceleration through more than 100 V will not stick or bounce off but will burrow into the surface, splashing atoms outwards. This is known as sputtering and provides a versatile alternative to thermal evaporation for metal-vapour deposition: more controllable, with adjustable uniformity, able to cope with alloys and high-melting-point metals and suitable for production-line automation. Given these advantages, it is also worth the effort to heat the
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SAT Prep: Test 5, Section 7, Part 1
Students, improve your math SAT score! The instructor uses an electronic chalkboard to model problems.  This video is appropriate for high school students. Uses a textbook (the official SAT study guide) commonly found in bookstores, but it is not absolutely necessary as the narrator does all work on the screen. Problems 1-5 starting on page 669.
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The Explorers - Lionfish hunting and night diving at Carrie Bow Cay, Belize
Georgia Tech researchers traveled to the Carrie Bow Cay field station in Belize for the coral spawning season. The team's goal was to collect coral larvae for their research. While there, they helped rid the reef of invasive lionfish. Read more at: www.rh.gatech.edu Special thanks to Moby for the music.
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Lesson 03 - One Minute Romanian
In lesson 3 of One Minute Romanian you will learn to say that you can speak a little Romanian. Remember - even a few phrases of a language can help you make friends and enjoy travel more. Find out more about One Minute Romanian at our website - http://www.oneminutelanguages.com. One Minute Romanian is brought to you by the Radio Lingua Network and is ©Copyright 2008.Author(s): No creator set

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3.5.1 Try some yourself

1 Answer the following questions

  • (a) What is 40% as a fraction?

  • (b) What is  Author(s): The Open University

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6 Further resources

Gilleard and Higgs (2000) more fully develop some of the ideas explored by Giddens (1994) in their useful and comprehensive introduction to post-structural readings of older age. Elder's (1977) life history account offers compelling insights into the intersections of class and gender through a socialist lens, and represents an early and interesting example of the life history and biographical method. Chamberlayne et al. (2000) provide comprehensive and thoughtful insights into biographical me
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Asia Week Ahead: Australia's growth set to sputter
Nov. 30 - Australia's Q3 GDP growth is likely to have slowed on weaker commodity prices, while Japan's economic gloom plays into upcoming elections.
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2.035 Special Topics in Mathematics with Applications: Linear Algebra and the Calculus of Variations
This course forms an introduction to a selection of mathematical topics that are not covered in traditional mechanical engineering curricula, such as differential geometry, integral geometry, discrete computational geometry, graph theory, optimization techniques, calculus of variations and linear algebra. The topics covered in any particular year depend on the interest of the students and instructor. Emphasis is on basic ideas and on applications in mechanical engineering. This year, the subject
Author(s): Abeyaratne, Rohan

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6.881 Representation and Modeling for Image Analysis (MIT)
Most algorithms in computer vision and image analysis can be understood in terms of two important components: a representation and a modeling/estimation algorithm. The representation defines what information is important about the objects and is used to describe them. The modeling techniques extract the information from images to instantiate the representation for the particular objects present in the scene. In this seminar, we will discuss popular representations (such as contours, level sets,
Author(s): Golland, Polina

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2.4 Homeomorphic surfaces

As we stated in Section 1, our aim is to classify surfaces up to homeomorphism. So it is worthwhile spending a little time examining what sorts of transformations of surfaces are homeomorphisms. We shall restrict the description to surfaces in space, as these are easier to deal with, though the result at the end of this subsection applies to all surfaces.

Recall that a homeomorphism between two topological spaces (such as surfaces in space) is a bijection with the property that b
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10.34 Numerical Methods Applied to Chemical Engineering (MIT)
This course focuses on the use of modern computational and mathematical techniques in chemical engineering. Starting from a discussion of linear systems as the basic computational unit in scientific computing, methods for solving sets of nonlinear algebraic equations, ordinary differential equations, and differential-algebraic (DAE) systems are presented. Probability theory and its use in physical modeling is covered, as is the statistical analysis of data and parameter estimation. The finite di
Author(s): Beers, Kenneth

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