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Spring and autumn are considered ideal seasons for sightseeing and all kinds of outdoor activities. Summers can be particularly hot The average daytime maximum temperature for the month of July is 33.5 °C(92.3 °F) and heatwaves are relatively common, occurring generally during the months of July and August, when hot air masses sweep across Greece from the south or the southwest. On such days temperatures soar over 37.8 °C(100 °F).
“The Acropolis is the one historical site you can't miss. You can take a tour or wander up there yourself, go early or late in the day will be a historical adventure”
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SOFTWARE “Microsoft Confirms Windows 7 Pre-Beta Launch”
Microsoft has confirmed it will release the first pre-beta version of Windows 7 to developers in Octuber. Windows 7 is the next major version of the Windows client operating system. Developers will get their first look at an alpha version of the operating system at the Professional Developers Conference (PDC) in October. Microsoft plans to demonstrate its progress on Windows 7 at the annual event. But the operating system itself won't debut in retail stores until 2010. Source: http://news.yahoo.com/
ENVIRONMENT “Chemistry for the climate” Dan Nocera, a chemist at the Massachusetts Institute of Technology (MIT), Cambridge, made a bold statement at the American Chemical Society's fall meeting in Philadelphia last month. He claimed that within five years he could build a device capable of producing locally sourced hydrogen gas, which could power all the world's houses, fill people's car batteries and revolutionize energy supply in the developing world. "I guarantee, in under five years, you'll see this," he said. Nocera's innovation, reported in July this year, is a simple catalyst that can produce oxygen from water under benign conditions.Such a system could boost solar power's contribution to the future mix of energy technologies, as the gases are produced using light during daytime and combined using a fuel cell to produce clean energy after dark.
PHOTOGRAPHY Kodak introduces advanced CCD sensors for Professionals
Kodak has designed a new line of advanced CCD (charge-coupled device) image sensors to power the latest medium format DSLRs, including the Leica S2, Sinar HY6-65 and Hasselblad H3DII-50. The Leica S2 features the KAF-37500 37.5MP sensor with an imaging area of 45mm x 30mm, bringing in a completely new format; interestingly it also includes a novel slimline infrared filter, which we'd guess could eventually find its way into a future Leica M sensor. The Sinar Hy6-65 sports the KAF-31600 34.6MP sensor with an imaging area of 46mm x 35mm, and the Hasselblad H3DII-50's KAF-50100 50MP, 48mm x 36mm sensor sets a new benchmark in medium format camera resolution. Source: http://www.dpreview.com
AUTOMOBILE “Chevrolet Volt Unveiled, As GM Turns 100” The Chevrolet Volt is undoubtedly the most popular car in the world that doesn’t yet exist. From the January 2007 unveiling of the concept through last week’s “leaked” photos of the production version, it routinely draws huge traffic and passionate comments to any website.
Assuming the Volt goes on sale in November 2010, lately GM has spent much less time qualifying that goal with, “If the batteries are ready”—it will be the world’s first production series hybrid. GM calls it an extended-range electric vehicle, or E-REV. That means it will run up to 40 miles on electricity from a 400-pound, 16-kWh lithium ion battery pack that powers a 150-hp electric motor driving the front wheels. Two-thirds of Americans drive less than 40 miles a day, so if they plug in the car to recharge it every night, they may never use any gasoline. GM quotes a cost of just 80 cents for that 40-mile recharge. But 40 miles isn’t enough to make a car practical, so the Volt also carries a 1.4-liter flex-fuel engine. Crucially, that engine doesn’t drive the wheels, it only kicks in to power a generator that recharges the battery enough to give the car another 300 miles of range. That range comes from an 8 gallon gas tank, mind you, so when the engine is running, the car gets close to 40 miles per gallon showing just how efficient electric cars are.. Sources: http://gm-volt.com, http://www.hybridcars.com
How Charging of the Battery Works in the Chevy Volt The battery is recharged by the engine, but only as little as possible. The point is to avoid petroleum use. Here’s how it works. For the first 40 miles, the fully charged battery (80% state of charge) powers the electric motor. Regenerative braking can help recharge the battery to a certain extent. When the vehicle drives past 40 miles, the battery reaches a 30% or so state of charge. So called “the customer depletion point”, preventing the battery from going below that sustains the batteries longevity. Lithium-ion cells don’t survive as long when they are deep discharged, and GM has the goal of 10 years/150,000 miles.
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