Acoustic Approach in Converting Heat to Electricity
A promising approach in converting heat or waste heat to electricity is in using the thermoacoustic effect. When heat generates a temperature gradient along a stack of large-surface area material inside an acoustic resonator, an intense sound can be generated. This type of energy converter, which is a self-sustained oscillator, has been developed so that the sound can be converted inside the unit to electricity using a piezoelectric device. Such devices are simple, and they have essentially no
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Energy Efficiency In Buildings And Heat Supply Solutions: A German Perspective For The Nuclear Shutd
Beginning with some background information on the unique German position regarding the energy supply eliminating any nuclear power by 2022 but enforcing the use of renewable energy sources, the challenges for both the building and the power generation sector will be highlighted. The talk will introduce opportunities to improve energy performance of buildings by new and innovative HVAC concepts as well as for increasing the penetration of renewable and environmental energy sources for heat and po
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What is a Recession?
This two-minute video explains what a recession is, the basic economic terms, and the psychological factor that often fuels a recession. It is very fast-paced and may need to be replayed. Stresses the importance of the word fear and how it can result in negative influences on the economy. Several methods to end a recession are discussed and they need to be explained to most students.
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The Bill of Rights Song (Rap) - (Easy and Understandable
This video musical is a rap that attempts to explain the more important elements of the Bill of Rights. The students might like it or it can be used as an example of a way that they can use to learn material. (02:21)
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Greece's test & euro zone votes
Sept. 28 - Inspectors set their sights on Greece's austerity reforms, and euro zone governments decide whether or not to strengthen the region's bailout fund. Kirsty Bassett reports.
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Breakingviews: U.S. has chance to borrow long -- very long
Sept. 30 - Reuters Breakingviews Columnist Agnes Crane says that historically low yields allow the U.S. government to issue 50 or 100-year bonds at exceptionally low rates.
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CALPACT Training: Introduction to Systemic Racism (Part 1)
In this 2-part training, participants will be exposed to the "power definition" of racism and will observe a racially diverse group of people reflecting on the meaning of the definition, and the efficacy of using the definition to address racism in institutions. A rationale will be explored for developing a full analysis of racism, including understanding its historic and legal roots and contemporary functioning. Participants will be introduced to racism as a systemic and structural problem that
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A More Secure World - From Neighbourhood to Globe [Audio]
Speaker(s): William J. Bratton | From Tottenham to global terrorism, developing policies and implementing schemes that work across the range of fighting neighbourhood violence to combating international terrorism share common themes. Bill Bratton, CBE, will discuss his ideas about policing with purpose and collaborating to create a more secure future. William J. Bratton is the Chairman of Kroll the world's leading risk consulting company. He is known as one of America's premier police chiefs, th
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Discover Tokyo Part 2/3
This 3:46 minute video is a tourist oriented presentation that shows some of the unique features of this city especially its transportation.
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Cape Blanco Lighthouse
Standing solidly nearly a century-and-a-half after its completion, the Cape Blanco Lighthouse continues to serve as beacon for seamen. (05:18)
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3.3.1 Try some yourself

Activity 22

A friend has been quoted a price of £25.50 per square yard for tarmac surfacing of his yard. The yard measures 6 yards by 10 feet. Here is his calculation of the total cost. What is wrong with it?

cost =
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Copyright © 2016 The Open University

Economy pulling out of soft patch
Oct. 20 - A drop in weekly U.S. unemployment claims and a rebound in monthly regional business activity point to an economic recovery that is once again growing slowly, even though housing remains a problem. Conway G. Gittens reports.
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Economics of Food Security in Jamaica
Brenda Wyss is an economist who has been studying the Jamaican economy and its agriculture sector for three decades. She began her work in Kingston in the early 1980s when trade liberalization was beginning to really effect Jamaica's farming industries. In this video she explains what benefits and costs result when a nation like Jamaica begins to rely on cheap foreign imports for food. See related reporting from the project "Agriculture and Jamaica's Rural Poor" :http://pulitzercenter.org/proj
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Weekly ISS Recap - Oct. 17-21, 2011
The weekly International Space Station video recap for Oct. 17-21, 2011.
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Europe Week Ahead: Investors expect plan from EU meetings
Oct. 21 - EU leaders are expected to meet and endorse a plan to strengthen banks' capital bases over the weekend and complete a deal on the scale of the rescue fund and a Greek debt haircut on Wednesday.
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Germany's business morale drops
Oct. 21 - Morale amongst Germany's business community is at its lowest point since June 2010 - falling for the fourth month in a row in October. Penny Tweedie reports.
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People in Egypt and Lebanon react to Gaddafi's death
Oct.21 - Muammar Gaddafi's death provokes mixed reactions in Cairo and Beirut. Sunita Rappai reports.
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GE likely to hike dividend by 20 percent, says Blair analyst
Oct. 21 - William Blair & Co. analyst Nick Heymann says General Electric investors should see a dividend increase later this year from 60 cents a share to 72 cents.
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Winans get a Hollywood Walk star
Oct. 21 - Gospel duo BeBe and CeCe Winans get star.
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Writing exercise: The city lives
After this chapter you will be able to write a short, descriptive text about an aspect of city life.
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