dr_orpheus

10 ms·

61.
by dr_orpheus 3y ago
Yeah I didn't find it there either, but there is an IEEE paper with testing [0]. Looks like they only did single event effect testing (SEE) and not total ionizing dose (TID) as well. The SEE is for looking and effects for individual me
62.
by dr_orpheus 3y ago
Goddard does do a lot of radiation testing on commercial chips. I believe they usually publish the results and should be able to look it up. Edit: database here, but I haven't looked for data on the chip: https://radhome.gsf
63.
by dr_orpheus 3y ago
Yes, most of the manned missions (at least Apollo and beyond as far as I'm aware) use the belt and suspenders approach of triple voting rad-hardened processors. So 3x RAD750s in a voting redundancy for main control systems.
64.
by dr_orpheus 3y ago
Near misses are absolutely like gifts from the heavens. I was part of a post-investigation for a near miss that would've looked like this if things had gone a bit differently: https://en.wikipedia.org/wiki/NOAA-19#
65.
by dr_orpheus 3y ago
This is essentially Hawkeye360's business model and to a lesser extent Aurora Insight. Both are satellite based analytics of RF signals. Hawkeye360 specifically lists Maritime Domain Awareness as one of their focuses: https:/&#x2
66.
by dr_orpheus 3y ago
They have filters in the air cycling that I assume include some sort of carbon filter for smell. However, astronauts have definitely noted that the ISS has "a smell" https://www.space.com/international-space-statio
67.
by dr_orpheus 3y ago
The beverages are not pre-made. Like most of the food that goes up to the space station it is all dehydrated so that you are launching as little water as possible (and therefore additional mass). Water is recycled on the station as much as
68.
by dr_orpheus 3y ago
They sell them here, but appear to be sold out: https://spaceware.co/ Although you can by the NASA flight-certified version for the low low price of $650
69.
by dr_orpheus 3y ago
> And then also things that are cut and dry worse for men (i.e. suicide rate) Not trying to dilute your point, because if you look at the "Data and Statistics" tab of the page you linked the disparity between male/female i
70.
by dr_orpheus 3y ago
Yes and no. So the slow/efficient acceleration is realized today with electric propulsion [0] which is very efficient in terms of fuel consumption because it accelerates the particles to such high speeds. But, it is very low thrust so
71.
by dr_orpheus 3y ago
For some context, I think some of the key legal points in here was that the he was fired because urinary analysis showed THC metabolites in his blood from the small amount of THC in the CBD. Part of the legal reasoning is that he knew the r
72.
by dr_orpheus 3y ago
Two individual ones. USA has individual bilateral security agreements with both. "Treaty of Mutual Cooperation and Security between the United States and Japan" or just the US-Japan Security treaty [0] "Mutual Defense Treaty
73.
by dr_orpheus 3y ago
In Mary Roach's book "Grunt" she talks about some of the poor decisions that went in to uniforms and how the style influences come full circle. Military camo influences fashion designers which influence commanders picking uni
74.
by dr_orpheus 3y ago
Yes and no. There are usage cost times for DSN stations [0]. That link is old and says it is on the order of $1000/hr in 2009. Inflation adjusted it would be more, but I think costs have actually risen to closer to a $5000/hr. The
75.
by dr_orpheus 3y ago
> Why cant they put a 4k lense on these things Bigger focal plane means more power, more data processing/storage means more power. More power means more solar arrays/batteries. More solar arrays/batteries means more mass.
76.
by dr_orpheus 3y ago
I've got a quote in front of me right now for a ~1 TB data recorder for just shy of $4 million. Also keep in mind this isn't even for the highest class parts, this is more in line for something like a NASA Explorers program level
77.
by dr_orpheus 3y ago
The DSN stations can receive from multiple spacecraft at the same time, but can only transmit to one. If you look at the DSN status station and click on the details sometimes you will see them in "MSPA (Multiple Spacecraft Per Antenna)
78.
by dr_orpheus 3y ago
"Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway." –Andrew Tanenbaum, 1981
79.
by dr_orpheus 3y ago
Also reminds me of the XKCD What-if: "When - if ever - will the bandwidth of the Internet surpass that of FedEx" https://what-if.xkcd.com/31/
80.
by dr_orpheus 3y ago
Seems likely, I had to keep going to work in person during COVID and my commute to work became very fast, and not just because of the empty roads. I also wonder if there was an uptick in fatality as people started returning to work and thos
81.
by dr_orpheus 3y ago
> Another question I'd like answered, do the Voyagers cycle down or turn off the heater during TX downtime? Turning it off risks metal/cycling fatigue, leaving it on risks reducing the cathode life—or even poisoning it from str
82.
by dr_orpheus 3y ago
> I'm surprised about is that there hasn't been much discussion about their componentry and why they've been so reliable I think part of this might be because it is still considered proprietary information. Kind of crazy,
83.
by dr_orpheus 3y ago
Theoretically, solid state amplifiers would have a longer service life. Vacuum tubes will always have cathode depletion causing them to degrade eventually (although this is pretty well controlled in most cases for long life). In space thoug
84.
by dr_orpheus 3y ago
Yes, and that is what most satellites due to estimate fuel. But any errors in that measurement can accumulate. See my other response on this thread for more details.
85.
by dr_orpheus 3y ago
No spacecraft has a "fuel gauge" in the traditional sense. You don't have gravity to for a float to work like any fuel gauge in a car or airplane. Fuel is driven by surface tension and pressure rather than any buoyancy/g
86.
by dr_orpheus 3y ago
Yes travelling wave tubes are still very common on modern satellites. They tend to be used most on high power (>50W RF power)/high frequency (K-band and higher) systems. I don't know the exact rationale, but for space systems i
87.
by dr_orpheus 3y ago
For me woodworking is also produced the coolest physical things that I've made. If I had to pick one, I think I would pick the kitchen island that I made. But I think my favorite moment came from the trim I did in the basement. We have
88.
by dr_orpheus 3y ago
Then sounds like you live in a place where the competition is driving down the prices. Where I lived before Comcast wanted ~$250/mo for something like 600/200. Now after I've moved (only like 20 miles) I live in a place where
89.
by dr_orpheus 3y ago
Second is "I pay $50 once to unlock heated seats in my car forever. This car now has heated seats and anyone that I sell it to also gets heated seats" Third is "I pay $5/month for heated seats for the entire time I own t
90.
by dr_orpheus 3y ago
"The amount of alcohol consumed by drinking historical beer brews is between 0.62 to 0.107, the % of alcohol in “small beer” is taken to be around 0.05 and the % in “strong beer” is taken to be around 0.135" Although it doesn&#x27

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