Seriál několika článečků popisující postup broušení a leštění zrcadla pro astronomický dalekohled tak, jak se provádí na kurzech pravidelně pořádaných Hvězdárnou v Rokycanech.
V běžné praxi se používají karborundová nebo korundová brusiva. Označují se číslem případně písmenem M následovaným číslem. Číslo udává maximální velikost zrn brusiva, a to v mikrometrech u brusiv M a v desítkách mikrometrů u brusiv bez M. Tedy například označení 16 nese brusivo se zrny 160 mikrometrů, M32 brusivo se zrny 32 mikrometrů. V sadě, kterou jsme dostli byla brusiva od 16 do M1, ale při práci jsme používali pouze brusiva od 10 do M7 a někteří ještě i M3.
I made a google spreadsheet with past and future SpaceX launches. Some guesses about booster reuse and revenue. It's mostly based on airider7's powerpoint and wikipedia. Let me know what you think
Elon crunching the cost to manufacture a rocket in a spreadsheet during a plane ride in 2002 and realizing SpaceX could do it at 1/50th the cost is the most productive use of a spreadsheet on a plane ride ever
Rocket Avionics - Building Lumineer Rocket Motor Assembly - Building Lumineer How To Build a Thrust Vectored Model Rocket - National Rocketry Conference 2020
I started https://t.co/vCxsyQYHo2 almost 7 years ago in the fall of 2015 with the goal to propulsively land a model rocket. I had no background in aero, EE, coding, etc so it took a lot of trial and error, but today I finally stuck the landing 🚀🎉 pic.twitter.com/z3MZfqQWxc
Pipe
Booster Pump Flow Switch Carries Out on-off Control Over Sensing
Elements through a Water Flow Type Magnetic Control Device, Thus
Achieving the Effects of Starting and Shutting Down Water Pumps.
This
water Flow Switch is to Protect the CO2 Laser Tube. When the Water Pump
is not Working, the Water Sensor will Detective, and Shut Down the
Laser Machine. So the Laser Tube will not be broken.
It can be used with a Water Pump, REPLACING water chiller.
Lift:3.2m, Flow:3000L/H, for 40w/60w/80w laser tube. For the Water Nozzles, Caliber: 8mm
RDWorks Learning Lab 96 The Ultimate Air Assist from 29 min
náramek - s přímým měřením tepu ze zápěstí, krokoměr, výpočet kalorií, monitoring spánku, měření rychlosti, měření tempa, měření EKG, připojení pomocí Bluetooth
The multibillion-euro navigation system Galileo went dark over the weekend.
Things began to wobble last Thursday, 11 July, as the European Global Navigation Satellite Systems Agency (EGSA) issued an advisory at 14:45 UTC warning of "service degradation".
At the time, sat-nav mag Inside GNSS reported that sources within the agency reckoned things would be back to normal over the weekend.
Unless normal service equals "borked beyond belief", things went downhill rapidly as a subsequent advisory issued on Saturday upped the designation to "service outage", noting that the event, which affects all satellites, actually started at 01:50 UTC on 12 July.
The European Union’s geolocation and navigation satellite system—known as Galileo—is offline due to issues with ground infrastructure. Galileo has been in operation since 2016 and consists of 22 satellites. It was created to offer an alternative to the US’s GPS system. No timeline has been given for getting the satellites back online, so Galileo is relying on GPS satellites in the interim.
source:
aspi strategist
www.aspistrategist.org.au
Scientists in the Emergent Photonics Lab (EPic Lab) at the University of Sussex have made a breakthrough to a crucial element of an atomic clock -- devices which could reduce our reliance on satellite mapping in the future -- using cutting-edge laser beam technology. Their development greatly improves the efficiency of the lancet (which in a traditional clock is responsible for counting), by 80% -- something which scientists around the world have been racing to achieve...
...For ZTE, which like Huawei is restricted in its business dealings in the U.S. due to security concerns, it is important to expand business in Japan and Europe, where massive investments in 5G are expected...
" 1982 -
Ren Zhengfei, China’s deputy director of the People’s Liberation Army engineering corps, leaves his senior officer post in the Information Engineering Academy. Ren, in his late 30s, was married to Meng Jun, daughter of a senior PLA officer who became the Communist Party of China’s high-ranking secretary in Sichuan province.
1987 -
Ren, five years out of the military, founds Huawei Technologies Co. Ltd. in the southern Chinese city of Shenzhen. The name “Hauwei” can be translated roughly as “Chinese achievements.” The firm describes itself as a “private company wholly owned by its employees” and over the next 30 years will grow to nearly 200,000 workers. That description has been disputed, as Ren holds more than one per cent of its shares and reportedly holds veto over decisions...
"
An arrest of an executive at China’s telecommunications giant Huawei in British Columbia has put Canada in a strained position between two global superpowers, the U.S. and China...
... Podle úřadu se stačí na operátora obrátit s „žádostí o přístup k osobním údajům ve smyslu čl. 15 nařízení (EU) 2016/679,
dle kterého můžete žádat jak podrobné informace o osobních údajích,
které jsou o Vás zpracovávány, tak i potvrzení o tom, že (určité) osobní
údaje zpracovávány nejsou“. Operátor pak ze zákona musí poskytnout
všechny detaily. A se stejným dotazem se rovněž možné se obrátit na
Společnost pro informační databáze ...
Pokud domyslíte Systém sociálního kreditu + spirály mlčení
In 2018, the New Economics Foundation compared the Chinese citizen score to other rating systems in the United Kingdom. These included using data from a citizen's credit score,
phone usage, rent payment, etc. to filter job applications, determine
access to social services, determine advertisements served, etc.[43][44] A similar score and blacklists affecting one's jobs, family life, and finances is measured in the UK Disclosure and Barring Service database.
Germany
In February 2018, Handelsblatt Global
reported that Germany may be "sleep walking" towards a system
comparable to China's. Using data from the universal credit rating
system, Schufa, geolocation and health records to determine access to credit and health insurance.[45]
