Power distribution in data centers used to emulate the architecture of old telephone central offices. A “rectifier” would step down and rectify the ac from the power line and use it to charge banks of batteries that provided an unregulated 48 V dc, which was distributed around the facility to run the telephone equipment in the racks.
Since at least 2007, data-center engineers have been talking about distributing 400 V dc (sometimes 380 V). Data centers are bigger and use a lot more power than telco central offices. At a minimum, higher voltage distribution would mean lower I2R losses and/or thinner power-distribution cables.
I enjoyed this pilot’s story of how a broken APU on his aircraft caused a mess.
For more than 50 years of jet airliner operation, the APU has been an integral part of airplane independence. The APU is a small jet engine located within the structure of the fuselage. With today’s airliners, the unit is operable both on the ground and in flight. In flight, the APU provides both a backup source of electric power and a limited amount of air pressure at lower altitudes — usually below 20,000 feet.
On the ground, the APU is capable of being the sole source of electricity and the sole source of air pressure. Air pressure from the APU is the standard method utilized in starting the engines. When air is not available, starting becomes problematic. On this particular trip, an inoperative APU became more problematic than my copilot and I could have ever imagined.
Recently I had a scare when our home storage server went on the fritz. Years of photographs, videos, and files were suddenly in jeopardy as they appeared to vanish. Being a resourceful geek, once I caught my breath I was able to revive everything. Still, it was enough of a scare that I accelerated my quest for a good, offsite place to back up our files.
Part of this quest was getting gigabit fiber Internet at home, which I recently did when I could no longer wait for Google Fiber and signed up with AT&T Fiber. Untangling this brave new world has kept me busy recently, not leaving much time for blogging. I will have lots to say about this in the near future but suffice to say that having a fat pipe at home makes it easier to do any kind of backup to the cloud.
You know that cool footage of the drone flying at night over downtown Raleigh’s Metropolitan Apartments fire last month? Yeah, the guy who filmed it broke all kinds of FAA rules. Kyle Snyder of N.C. State’s NextGen center tells The Virginia Pilot why.
Examples of rogue drone flying are many. A man flew one over a large fire in downtown Raleigh last month, breaking several rules including flying at night and beyond his line of sight, Snyder said. The pilot posted the footage online along with his identity.No citations are known to have been issued to drone pilots in North Carolina so far, Snyder said.
While we’re at it, footage apparently sold to another “viral media” company of the flooding on Wake Forest Road late last month also could be in violation of FAA rules if the pilot shot it and sold it without being a licensed commercial drone pilot with a Remote Pilot Certificate.
I got another “Someone has your password” emails today from Google’s security team. These appear to be sent due to a flaw in the way Google geolocates the IP addresses used by our T-Mobile phones and are thus false alarms. That doesn’t keep me from freaking out every time I get one, however.
What’s more, it is exactly these emails that compromised John Podesta and the Democratic National Committee’s emails during the campaign. I consider myself fairly savvy at detecting phishing emails but I have to admit that the fake email the Russians sent was good enough to have had a chance of catching me.
I emailed a friend at Google to make sure the company knew their geolocation stuff was in need of serious work. My friend replied that Google is aware that their algorithm needs work and were working on a way to receive feedback from the message recipients. It appears Google’s “New sign in from …
I appreciate getting alerts when unauthorized activity is detected but I could certainly do without the false alarms.
This past Saturday was the day of the annual HKonJ rally and march (#HKonJ #MoralMarch hashtags). HKonJ stands for Historic Thousands on Jones Street. It was one of several HKonJ marches I’ve attended. Previous marches sometimes seemed overly optimistic calling themselves “thousands” as there didn’t seem to be a lot of interest. That certainly wasn’t the case Saturday as there was arguably the biggest demonstration I’ve ever seen in Raleigh.
Kelly, Hallie, and I attended but we were running late due to all the other things that happen in the Turner household on weekends. By the time we had made our signs and were in the car, it was close to 10:30 AM. We parked the car in the parking deck at Blount and Cabarrus and snapped a quick photo before heading off. Kelly and Hallie took their signs and joined the crowd marching towards Fayetteville Street, while I took advantage of the empty parking deck to launch my drone for some aerial footage of the crowd.
All day long, Chinese spammers have taken advantage of an apparent flaw in Automattic’s (the makers of WordPress) Jetpack plugin. This morning, I noticed a slew of email bounces in my inbox, all with Chinese letters in them and a link to one of my blog posts. It turns out that the spammer has been clicking on the post’s “Share This” link and somehow entering their spam as the resulting email’s “From” address. Each email goes to a “qq.com” address, which is a Chinese mail provider.
The only way I could stop these emails was to turn off Sharing under Jetpack’s settings. Upgrading to the latest Jetpack (4.6) didn’t seem to help.