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Rocket Lab Unveils Battery-Powered Turbomachinery
Rocket Lab Unveils Battery-Powered Turbomachinery
"""
Rocket Lab, a sounding rocket and launch vehicle company co-located in the U.S. and New Zealand, is preparing to begin testing a smallsat launcher dubbed Electron that would use battery-powered turbomachinery and other innovations to hold the cost per mission below $5 million.
The company, which received U.S. Defense Department funding before branching into commercial development, unveiled its Rutherford engine [...] uses high-performance brushless DC electric motors to drive its liquid oxygen and kerosene turbomachinery, drawing power from lithium polymer batteries.
[...].
Each Rutherford engine has two electric motors the size of a soda can, Beck says, one for each propellant. The small motors generate 50 hp while spinning at 40,000 rpm, “not a trivial problem,” he says.
“The battery technology is also a little bit special,” Beck says. “We’re drawing huge currents and huge energies from those batteries to provide the energy, [...] business model, which foresees customers with payloads weighing as much as 100 kg (220 lb.) launching into 500-km (310-mi.) Sun-synchronous orbits or to inclinations as low as 46 deg. [...] Beck says the company has about 30 “commitments” from customers.
[...]
“In 2009, we launched R-1, our first sounding rocket, on a suborbital ballistic arc,” Beck says. “That got the attention of agencies in the U.S., particularly Darpa.”
"""
http://m.aviationweek.com/space/rocket-lab-unveils-battery-powered-turbomachinery
http://m.aviationweek.com/space/rocket-lab-unveils-battery-powered-turbomachinery
Labels: Oleg Zabluda
- posted by Oleg Zabluda @ 5:45 PM | permalink | | | technorati | bloglines | feedster
google books: что произошло и что делать?
google books: что произошло и что делать?
"""
По всей видимости, около 4 недель назад разработчики внесли в код поисковой машины изменения, которые затронули определенные функции поиска. После этого количество результатов поиска (при неизменных запросах) уменьшилось в разы, или даже на порядки. В выдачу попадают, в основном, недавно изданные книги в режиме доступа preview.
Книги в режиме доступа snippet view в выдачу попадают в крайне ограниченном (по сравнению с ситуацией до октября 2016 года) количестве.
На микро-уровне проблема выглядит так, что практически перестал работать поиск внутри книг.
"""
http://labas.livejournal.com/1158059.html
http://labas.livejournal.com/1158059.html
Labels: Oleg Zabluda
- posted by Oleg Zabluda @ 8:32 AM | permalink | | | technorati | bloglines | feedster
