|Ken Novak's Weblog
Purpose of this blog: to retain annotated bookmarks for my future reference, and to offer others my filter technology and other news. Note that this blog is categorized. Use the category links to find items that match your interests.
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Monday, October 06, 2003
Aljazeera: Arab firms win Iraqi mobile phone contracts:
"Shunning Western bidders, Iraq has awarded two-year GSM mobile phone contracts to three Arab firms: Orascom, Atheer Tel and Asia Cell. The licences are among the most potentially lucrative and high-profile contracts to be offered in post-war Iraq. .. As many as 100 bids were received from interested parties in the contracts. Abbadi did not reveal who the other candidates were but Orascom's Sawiris said there were “more than four or five US firms” in the race." An Australian report
: "IRAQ has awarded its first national mobile telephone network contracts to Egypt's Orascom, Atheer Tel and Asia Cell, both largely Kuwaiti owned, saying it expected the long-awaited GSM service to begin by the end of the month." 6:30:26 PM
Lockheed Martin wins airship competition
: The PV-powered helium UAV can "loiter with a 4,000lb (1,814kg) multimission payload in quasi geostationary orbit at altitudes around 65,000ft for periods much greater than contemporary unmanned air vehicles. This could be up to a month with a planned prototype unit and approaching a year for an operational variant. Yet, unlike a satellite, the airship could return to base for maintenance.
Lockheed Martin's highly autonomous, helium-filled design is 152.4m long, 48.7m in diameter, with a volume of 1.5 million m3, said Ronald Browning, the company's director of surveillance systems business development. It carries four electric motors with vectorable large twin-bladed propellers, two on each side of the vehicle [with] high strength-to-weight ratio materials for the airship's skin and thin-film photovoltaic cells to generate power [for] propulsion and the 10 kilowatts necessary to operate the airship's payload.
The company is now under a $40 million contract to mature its airship design through a critical design review in mid-2004. " 5:44:46 PM
Hybrid lighting uses fiber optics to bring daylight inside:
"Hybrid solar lighting, which is nearly 10 times more efficient than the most affordable solar cells today, is a concept being developed at ORNL. Jeff Muhs, who leads the research effort, notes .. "hybrid lighting uses sunlight directly," Muhs said. "Roof-mounted collectors concentrate sunlight into optical fibers that carry the light inside buildings to hybrid light fixtures that also contain electric lamps."
Control systems keep rooms at a constant lighting level by dimming the electric lights when the sunlight is bright and turning them up as clouds move in or as the sun sets. The result is a dramatic improvement over conventional approaches to bring sunlight into buildings.
The hybrid solar lighting system also overcomes a number of limitations of conventional approaches. "Daylit buildings are comparatively more costly to design, more constrained in terms of space utility, more difficult to cool during the summer, more difficult to evenly illuminate and more likely to develop maintenance problems caused by large roof penetrations," Muhs said.
From an economic perspective, a study for Department of Energy by the Antares Group concluded that up to 1 million hybrid solar lighting systems could be in use by 2020, saving rate payers billions of dollars annually. " 5:39:55 PM
Further details about ST organic dye PV research: "the Graetzel cell, known as the Dye-Sensitized Solar Cell (DSSC), mimics the mechanism that plants use to convert sunlight into energy, where each function is performed by different substances. The DSSC cell uses an organic dye (photosensitizer) to absorb the light and create electron-hole pairs, a nanoporous (high surface area) metal oxide layer to transport the electrons, and a hole-transporting material, which is typically a liquid electrolyte. "One of the most exciting avenues we are exploring is the replacement of the liquid electrolytes that are mostly used today for the hole-transport function by conductive polymers. This could lead to further reductions in cost per Watt"...
The ST team is also developing low cost solar cells using a full organic approach, in which a mixture of electron-acceptor and electron-donor organic materials is sandwiched between two electrodes. The nanostructure of this blend is crucial for the cell performance because the electron-donor and electron-acceptor materials have to be in an intimate contact at distances below 10 nm. ST plans to use Fullerene (C60) as the electron-acceptor material and an organic copper compound as the electron-donor." 5:31:51 PM
: features many small and medium-sized solar energy projects in developing countries. 2:16:52 PM
Spam Fighters Turn to Identifying Legitimate E-Mail
: Partial summary of standards-based anti-spam efforts. "Put simply, these efforts are trying to develop the Internet equivalent of caller ID, a technology that will let the receiver of an e-mail message verify the identity of the sender. As with caller ID for telephones, senders will be able to choose whether to remain anonymous. But also like caller ID, recipients may presume that those who do not identify themselves are sending junk. The loudest calls for such a system are coming from the banks, travel companies and online stores that are finding that much of their e-mail is getting caught in spam filters." Per-message and per-MTA authentication methods compete for attention. 10:30:06 AM
Korean Housewives Want Speedy Net: "Most [S Korean homes] pay about $33 monthly for an 8 megabit-per-second connection. Wireless access, which allows subscribers to access numerous public Wi-Fi networks, costs an extra $8.50 a month. Koreans spend an average of 16 hours a week on the Internet -- compared to 10 hours for Americans and four hours for the British ..
Such broadband vitality didn't come out of nowhere. The Korean government sank over $1.5 billion into helping create the world's most advanced telecommunications network, according to a report from Britain's Brunel University. The government also offered a range of "soft loans" -- very low-interest loans -- to operators ready to build out infrastructure. ..
"Initially Internet traffic went overseas, 98 percent of it," Son said. "There was no Korean content. But this has changed completely. Domestic traffic is now about 85 percent, and overseas, 15 percent. However, this does not mean that overseas traffic has decreased. Instead, domestic traffic has increased." ..
"So many people are trying to see first what the killer application will be for broadband. In our experience, broadband itself is the killer application," Son said" 2:56:46 AM