generuso

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61.
by generuso 1y ago
The author said somewhere, (maybe in the comments) that they had purchased ready made iron oxide of required particle size.
62.
by generuso 1y ago
If the chip is subjected to a few thousand g's of shock the wires can bend and short. This failure mode is quite low on the list among others, but it is something that people did investigate. For example: "Swing Touch Risk Assessm
63.
by generuso 2y ago
Jonathan is very knowledgeable and is usually right. But in this specific instance, everything points out that this is indeed a component of a rocket. The eyewitnesses describe that the object fell with a high velocity, with a loud noise, a
64.
by generuso 2y ago
Vishay is one of the large manufacturers of discrete semiconductors and passive electronic components. They maintain a significant manufacturing presence in the USA, with about a dozen of factories. The legendary ATC (American Technical Cer
65.
by generuso 2y ago
There is additional nuance here. Not all of the MRI machines are the same. The USA typically uses machines with higher magnetic field strength, which are more expensive but produce higher spatial resolution. These machines are based on larg
66.
by generuso 2y ago
That is a rare level of cunning! A simpler, somewhat common version is when one dog pretends that there is something interesting outside, so that the other dog would drop the toy and would run to the window hoping to bark at the mailman, wh
67.
by generuso 2y ago
Dogs are amazing. And human brains/minds are without doubt even more complex than those of dogs. But it is typical for humans to not be aware of the true reasons of behaving or even feeling in the way they do. When asked about causes o
68.
by generuso 2y ago
CRT tubes usually have stern safety labels warning to not exceed specified voltage, not because there will be an electric breakdown, but because this will generate vastly more X-rays. So the quotation "glass formulation limits the volt
69.
by generuso 2y ago
Indeed. My mistake.
70.
by generuso 2y ago
The author is Peter Bloem, and the html is compiled from these sources: https://github.com/pbloem/gestalt.ink with the help of mathjax: https://www.mathjax.org/ The font seems to be Georgia.
71.
by generuso 2y ago
Making any kind of a rocket that works is already nontrivial (once one goes beyond Estes models), but in terms of complexity of the challenge, making some kind of a hopper that goes up and down is a task that ambitious amateur groups with a
72.
by generuso 2y ago
It is great that the author of the video helps to introduce the topic to the general audience. This is a vast and a fascinating subject with lots of material available for a further more systematic study. It becomes more technical, if one i
73.
by generuso 2y ago
As the article explains, with a well designed procedure, the required navigation accuracy is quite modest. Even the latest consumer IMUs and GPS would do, and SpaceX is using even slightly more accurate "tactical grade" units, typ
74.
by generuso 2y ago
Falcon-9 uses radar altimeters for determining vertical "distance to go" during landing. While a sideways position error of even ten meters is not fatal, it is critical for the rocket to be quite close to zero altitude when decele
75.
by generuso 2y ago
Starlink satellites use on-board GPS receivers for extremely accurate (centimeter level) measurements of their position. The orbits which SpaceX reports to the world (for collision avoidance) are based on these measurements.
76.
by generuso 2y ago
Maybe the flare on the side started as purposeful. But there was also a fire inside, between the engines, with flaming pieces of some pipes or cables raining down from the rocket. You can see one example of this just after this timestamp:
77.
by generuso 2y ago
It helps enormously that unlike Falcon-9 this rocket can dial down the thrust of its engines low enough to be able to actually hover or to move arbitrarily slowly in the final meters before touchdown. It can arrive to the designated interme
78.
by generuso 2y ago
Falcon-9 relies on GPS and a couple of altimeters. (Filtered, as others have already said, with the help of data from the inertial sensors.) Compared to Falcon-9, Starship/Superheavy additionally has a command link from the ground. Whe
79.
by generuso 2y ago
Usually it is a small telescope on a nice motorized mount weighing a ton. NASA had several of those around Cape Canaveral [1]. [1] https://www.youtube.com/watch?v=xig3sL_rRH8
80.
by generuso 2y ago
It is common for Starship prototypes to have uncontrolled fires, but it is obviously not a good thing. For example, prototype number 10 exploded 8 minutes after landing [1] because of a seemingly insignificant fire at the bottom. After toda
81.
by generuso 2y ago
The researchers have taken a very simple idealized mathematical model of a neuron, assumed that all synaptic weights were the same, ignored modulation, ignored base level inhibitory inputs, and have shown that even in such a crude setting,
82.
by generuso 2y ago
Unfortunately, not. We get the graph of the connections, but there are tons of essential parameters that are not captured. Such as the synaptic weights, the complex non-linear dynamics of the real neurons, their intricate modulation by vari
83.
by generuso 2y ago
Norton Sales [1] used to be a legendary source of surplus rocket and aviation parts, but these days they seem to mostly rent stuff out. There is a story how Peter Beck bought there an LR101 vernier thruster from Atlas ICBM, and then smuggle
84.
by generuso 2y ago
Not just a bit. All materials can be compressed quite a lot, given high enough pressure. For example, at the extreme pressures in inertially confined fusion, solid deuterium starts with 0.2 g/mL density and for a brief moment is squish
85.
by generuso 2y ago
If they get some traction, it might be interesting. It reminded me of another project which I have almost forgotten about. David Doty is a respected name in a narrow circle of nuclear magnetic resonance scientists for the hardware that his
86.
by generuso 2y ago
If I remember this correctly, NASA is allowed to settle only very tiny damage claims on their own. Above a few thousand dollars they are required to defer to the Attorney General, whose office settles the larger claims against federal agenc
87.
by generuso 2y ago
It is not that we do not teach this anywhere at all, but we certainly do not teach this in the introductory science classes, where the goal is to provide an accessible path to the already available "shrink wrapped" conceptual fram
88.
by generuso 2y ago
The article refers to a prior work where an ion implanter used mass-spectrometry to prepare an isotopically pure beam. I think it is common for ion implanters to have a mass filter to keep various impurities out. The mentioned in the articl
89.
by generuso 2y ago
It depends. On the lower end of the spectrum, there are high volume products that offer somewhat better performance for just a tiny increase in cost, as mentioned in other comments. On the higher end of the spectrum there are laboratory-gra
90.
by generuso 2y ago
The material costs (the $300 per kg of titanium suggested in another comment) are only a small part of the overall expense. Electron beam sintering printer time typically costs $100-$200 per hour, and a large build can easily take multiple

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