D_Alex

20 ms·

181.
by D_Alex 7y ago
This was okay, but if you want to see how the pros do it, try to apply for a Russian visa on their Australian web site. Things I remember: - Not being able to enter my correct date of birth. At all. So you enter an incorrect date to get to
182.
by D_Alex 7y ago
>better option than government regulation to afford that same protection What do you have in mind?
183.
by D_Alex 7y ago
>What are the alternatives? This is exactly the right question. Assuming that the goal is a reduction in atmospheric CO2, there are many alternatives that are at least an order of magnitude more cost-effective. Of those, more land based
184.
by D_Alex 7y ago
I don't have an aerospace degree, but I will nonetheless comment on a few of your comments: Engine cooling: diesel engines need substantially less cooling than petrol engines, hp-for-hp. Gearbox certification: you are generalizing from
185.
by D_Alex 7y ago
Oh, yesss. Also, bird poop. Seriously - it is already a problem for solar cells on unmanned offshore oil and gas platforms.
186.
by D_Alex 7y ago
> Is it made of Aluminum or other expansive metal? There are few metals as cheap as aluminium, actually I cannot think of any except iron. Bulk aluminium costs less than $1/pound. Of course if the legs were not hollow, they might be
187.
by D_Alex 7y ago
First of all, do not rely on that site to provide you accurate, unbiased advice. They have an agenda, and they are pushing it. Second, there is a huge difference between using small wind turbines in the city, where the alternative is reliab
188.
by D_Alex 7y ago
What clock speed do the human synapses run at though?
189.
by D_Alex 7y ago
>It is range that is the problem. I'm surprised... urban bus speeds in the US are below 15 mph, see below, so even a 180 mile range should give over 12 hrs operation. Electric buses are very efficient on hills and in stop-start cond
190.
by D_Alex 7y ago
A medical grade MRI scanner costs around $1 million, and maintenance costs are circa $100,000/year. With good utilisation, say 3000 hrs/year, the machine costs might be around $70/hr. The $550/hr you are paying may be
191.
by D_Alex 7y ago
I, of course, understand the "Puom" koan, but I am not sure how to explain it to my friend... can anyone help?
192.
by D_Alex 7y ago
$98/scan in Japan. https://www.pbs.org/wgbh/pages/frontline/sickaroundtheworld/...
193.
by D_Alex 7y ago
>If running the MRI machine cost $100, people would do it. There are different kinds of MRIs, but the actual direct costs for running an MRI without preparatory procedures is around $100 (preparatory dye injection may be another $50 cos
194.
by D_Alex 7y ago
> You can burn as much scanner time as you want chasing resolution/quality, but an hour seems reasonable. Out of curiosity, what determines the speed of the MRI scan? Are massive improvements theoretically possible?
195.
by D_Alex 7y ago
First sentence of the accompanying text: "The efforts of thousands of workers and billions of dollars spent on decontaminating the contaminated areas are beginning to bear fruit." This is hardly fearmongering. Also from the articl
196.
by D_Alex 7y ago
Photo Stealer Police 16 maja, 2019 at 12:04 pm These photos are stolen and uncredited from James Galbraith who took them in early 2018, if not earlier. Did you write this on the photographer's web site?
197.
by D_Alex 7y ago
Ugh... shame on you. Where is the fearmongering? And no, the photos were not stolen. The photographer has visited Fukushima on several occasions, you can see that on the rest of his site, and he appears himself on some of the earlier pictur
198.
by D_Alex 7y ago
It is amazing that both photographers took the same photos from almost the same location... but if you look closely the photo in the "photo essay" was actually taken from a slightly higher position. For example, you can see that t
199.
by D_Alex 7y ago
The other photo essays on the site are well worth checking out also. Especially the one on Buran shuttle!
200.
Fukushima 8 years on – photo essay(podniesinski.pl)
117 points by D_Alex 7y ago|85 comments
201.
by D_Alex 7y ago
"We cannot guarantee that any simple or complex message, even when recognized and correctly interpreted, will deter a human being from inappropriate action." From https://prod-ng.sandia.gov/techlib-noauth/acce
202.
by D_Alex 7y ago
This is very interesting, but note that in the diagram on the linked page, the "consumers" are "not controllable" - so it seems that this does not address the demand side management opportunity.
203.
by D_Alex 7y ago
I am not sure... where I live (Australia), the electricity supply policy is essentially aimed at avoiding brownouts on hot days, I suppose for the fear of losing building cooling (this has resulted in fatalities in the past). This incidenta
204.
by D_Alex 7y ago
Nice find! This is exactly what I had in mind! It is curious that this system is only compatible with Nissan leaf though. Perhaps we should work on a standard?
205.
by D_Alex 7y ago
The article lists three important solutions for transition to clean electricity. But there is also a fourth important solution, one that I think HN crowd can help with: demand side management systems. Essentially, this aims to match energy
206.
by D_Alex 7y ago
> we absorb CO2 and water vapor from the air into an aqueous electrolyte....to get the fuel out of the water...we have a carbon nanotube membrane Considering the partial pressure of CO2 in the atmosphere is miniscule, the eventual concen
207.
by D_Alex 7y ago
If you only reflect a portion of the power, say 80%, then only 10 kW is absorbed as heat. I suspect the flow of air around the missile provides effective cooling.
208.
by D_Alex 7y ago
I strongly suspect that the study, like many others before it, is flawed in the way it calculates the return on housing investment. In terms of capital gains, I see no evidence that like is compared with like, I suspect that a 1930s house i
209.
by D_Alex 7y ago
>I understand you perfectly. I don't think so. >I just don't agree with a single sentence of it.... The more costly fossil fuel gets, the more attractive Prometheus gets. As it is, they seem to be claiming to be cost effecti
210.
by D_Alex 7y ago
Yes, sometimes this is practicable. But many locations do not have sufficient renewable energy available, and nuclear has become unpalatable for a variety of reasons. Scrubbing CO2 from boiler or turbine exhaust takes a small fraction (5%-i

More ›