Google Tech Talk February 17, 2010 ABSTRACT Presented by Ambassador Charles Ries. What are the challenges and benefits of economic development in a country like Iraq? What is the shape of today’s economy in Iraq and how does a country prosper during a transition from war to economic development? Ambassador Charles Ries will provide a view from the front-lines of Iraq’s past and present economic development, as well as a perspective on what we can expect to see in Iraq’s future. As the most recent Minister for Economic Affairs and Coordinator for Economic Transition in Iraq at the US Embassy in Baghdad, Ries is an authority on the challenges and benefits of economic development. About the Speaker: Ambassador Charles Ries is a senior fellow at RAND. He most recently served as the Minister for Economic Affairs and Coordinator for Economic Transition in Iraq at the US Embassy in Baghdad. Before that, he was US Ambassador to Greece and Principal Deputy Assistant Secretary of State for European and Eurasian Affairs. In earlier state department assignments, Ries was the Minister Counselor for Economic Affairs at the US Embassy in London and Minister Counselor for Economic Affairs at the US Mission to the EU. He served as Deputy Assistant US Trade Representative for North American Affairs and as a member of the NAFTA negotiating team.

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A flat screen TV with hidden wires looks great, but it is a bit of an art form to get your TV successfully mounted so that no wires are showing. You can use the outside of the wall system, where you buy color coded wires that match the wall. However, most people want the cables completely hidden and out of view. Here are a few things that you can do to make sure that your TV wall mount appears wire free.

1. Before you begin the installation process make sure that the particular wall where you want to place your TV is suitable for hiding wires. It should be an interior wall made of drywall, and should also have limited amounts of insulation.

2. Place small holes in the precise location or you can use a template provided by the wall plate manufacturer where you want to the wires to enter and exit. The holes should only be big enough for the wire to fit through; however be careful not to cut the holes too small. This often times leads people to try and “squeeze” wires into the wall, which can damage the wall further.

3. Get covers for where the wires enter and exit the wall. This keeps your wall from being damaged any further, and is also an excellent safety prevention measure for small children.

4. Measure the distance from the back of your television to any AV systems or gaming systems that you have. You want to make sure that your TV is at the right height for a wall mount, meaning that the cables reach from the back of the TV to the floor.

5. Hire an electrician to install a recessed plug right behind your TV wall mount. You do not want to run the power wire through the wall, so you either need to do this step or have one wire exposed.

6. Find the most direct route from the back of the television to the floor, and run the wires to the proper locations through the previously cut holes. Congratulations! Now you are ready to view your flat panel TV with no wires hanging from your TV wall mount.

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My longest video yet and starts out like a normal playthrough/ commentary. However, it slowly evolves into a brew of pure hate and anger. CasaAnbu = www.youtube.com Also this video took 22 Hours, 52 Minutes, and 34 Seconds to render. Annoying as hell.

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On May 18, 2010, FTA Administrator Peter Rogoff served as a keynote speaker at the conference “Next Stop: A Summit on the Future of Transit” at the Federal Reserve Bank of Boston. The purpose of the summit was two-fold: to elevate the need for soundly-funded and efficient transportation from a local issue to one of greater national importance and to engage communities as key stakeholders in ensuring continued reliable transit. [The speech as prepared is available until full transcription can be made available].

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Speakers are one of the most essential parts of any electrical audio system. A speaker or a speaker system actually comprises of electromechanical transducers that convert an electrical signal into sound. Depending on a lot of factors such as functioning dynamics and structural variations, speakers come in several types. Each type has got its own set of features and characteristics.

Loudspeakers have come a long way from the days of 1876 when Alexander Graham Bell patented the first electrical loudspeaker as part of his telephone. With the unprecedented improvement in technology since then, speakers have also evolved from a simple metal horn to the present day hi fi plasma arc speakers. But the basic technology is in fact rather simple and has not altered much for nearly 50 years. However modern speakers sound much better than they did 50 years ago.

The word loudspeaker usually denotes individual devices or drivers, and the entire system consisting of an enclosure integrating one or more drivers and additional electronics. Based on such structural qualities as well as the dynamics of working some of the popular types of speakers are as followed.

The monopole is a box speaker with its collection of speaker drivers generally set together on one side of the box. Sound transmission is achieved usually when all drivers are operated with the help of the movement of air in the same direction.

Bipole speakers have two cones, one facing the room, and the other facing backwards to produce one half of the total sound quantity as a direct sound and the other reflects off the wall.

Dipole speakers are of two types. One is physically similar to bipoles, but the speakers are out of phase, the front cone and the rear cone move in opposite directions. And the other with both speakers almost in front, but pointed 90 degree off from each other, so if the speaker is mounted on the wall, the speakers are aimed along the wall.

Speakers are also categorized based on the operating technology and other specifications as well. Accordingly there are several types available in the market.

Based on impedance speakers can be 4 ohms or 8 ohms type. Again the baffle or enclosure types are responsible for names such as sealed speaker, bass reflex speaker etc. The number of drivers a speaker has got also decides its classification such as 2 ways, 3 ways etc.

There is a full range single driver speaker, which attempts to cover the entire audible frequency spectrum with only one driver unit. Therefore, there is no need of an electronic crossover network.

The other is the midrange, which has the capability to produce frequency ranging from approximately 300 to 5000 hertz. They are also called, less commonly, squawkers.

Piezoelectric speakers are commonly found in watches used as beepers. They produce single high frequency sound.

Electrostatic loudspeakers produce sound by using high voltage electric field to drive a thin membrane between two perforated conductive plates called stators.

Ribbon speakers, just as the name suggests, consist a thin metal film ribbon suspended in a magnetic field. When electrical signal is applied to the ribbon it produces the sound.

Planar magnetic loudspeakers have flat roughly rectangular shaped radiating surfaces, with a flexible membrane and a voice coil printed or mounted on them. The current flowing through the coil interacts with the magnetic field of carefully placed magnets on either side of the diaphragm. This causes the membrane to vibrate more or less uniformly and without much bending or wrinkling.

Bending wave loudspeakers use a diaphragm that is intentionally flexible.

Plasma arc speakers use electrical plasma as drivers. It has minimal mass, but it can be charged and manipulated by an electric field, the result is a very linear output at frequencies far higher than the audible range.

Apart from the above mentioned speaker types, one can find other classifications of speakers, based on various other features and functionalities, such as woofers, subwoofers, tweeters, etc.

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