femto

73 ms·

721.
by femto 6y ago
But if they are limited the same radiated power (an important caveat placed on the "free for all", in the form of a class license) the MIMO system will be able to get more power focused on its receiver, and within that spatial reg
722.
by femto 6y ago
The rule of thumb I use is that the utilisation of the spectrum is 5%. This is based on a conference that I went to (20 years ago granted) where an Australian group had actually measured the utilisation of the spectrum. This was in the co
723.
by femto 6y ago
CSIRO's Ngara aims to solve the same problem of rural access [1]. It was designed about 10 years ago, with a view to being the rural segment of Australia's National Broadband Network, but the NBN passed on the technology. Ngara w
724.
by femto 6y ago
"Sharrows" are cynically known as "dead cyclists" in sections of the Australian bike community, with an analogy to the chalk body outlines one finds in crime dramas. They save the police having to draw the outline when
725.
by femto 6y ago
The main reason the plasma needs to be kept away from the walls is that they will conduct the heat away from the plasma and the hot gas will cease being a plasma. It has analogies with static electricity. Static electricity might have a vo
726.
by femto 6y ago
I'll be interested to see the advertising associated with its Q4 2020 Australian release [1]. Anything sold in Australia that makes a claim relating to COVID-19 is counted as a Therapeutic Good and must be approved by Australia's
727.
by femto 6y ago
Ninjam might also be of interest? It works on a similar principle, but it explicitly sets the delay to an integral number of beats or bars so everyone is synchronised. It was released in 2005 and is GPL licensed. https://en.wik
728.
Tech giants part of a 'galactic empire': Home Affairs boss(smh.com.au)
2 points by femto 6y ago|0 comments
729.
by femto 6y ago
Thanks for the respect! I understand your points and I think you are correct in light of today's technology, but respectfully I think you're being a bit pessimistic about the future. (I'm an Electrical Engineer, qualified to
730.
by femto 6y ago
Enphase's claim to fame is the "microinverter". In most solar systems the direct current from all the panels is combined and sent to one big inverter. With microinverters, there is an inverter per solar panel and the power
731.
by femto 6y ago
One interpretation of the "Internet of Energy" is that it is the use of data networks to improve the control of energy networks. I think there is another level beyond this though. The revolution in data networks happened when the
732.
Let’s Build a Global Power Grid (2015)(spectrum.ieee.org)
57 points by femto 6y ago|23 comments
733.
by femto 6y ago
Or (more likely?) a network of HVDC cables encircling the Earth, much as the world is currently enmeshed with optical fibre. The sun never sets on the solar network. It's actually a real thing with the gradual roll out of HVDC between
734.
by femto 6y ago
If DIYing, choose your UV wavelength wisely. UVC (around 254nm wavelength) is germicidal and doesn't produce ozone (it actually dissociates ozone). "Vacuum UV" (in the range 185nm) converts oxygen in the air to ozone, which
735.
by femto 6y ago
How general is the maths at work here? Is "pulse shaping" another way of saying "controlling the wavefront"? In that case is the maths similar to that used in massive MIMO in communications systems (which in turn is co
736.
by femto 6y ago
Why use lasers? Why not just monitor input power and output power, and if the difference is too great infer that the power is being lost somewhere (ie. being absorbed by an obstruction) and back the power off until the losses/obstruct
737.
by femto 6y ago
Isn't a "fleet-wide hack of autonomous vehicles" an oxymoron? They clearly aren't autonomous if they are controlled by an outside force that can be hacked. Maybe it depends on perspective, with the manufacturer seeing o
738.
Scientists slash dengue fever in Indonesia by infecting mosquitoes with bacteria(abc.net.au)
1 points by femto 6y ago|1 comments
739.
by femto 6y ago
Details here for the curious: https://www.who.int/westernpacific/news/q-a-detail/what-is-v... Summary: Whilst initial immunity is developing after vaccination, attenuated polio viruses can be excreted and cau
740.
The Just-In-Time supply chain theory conquered the world – has it gone too far?(abc.net.au)
3 points by femto 6y ago|0 comments
741.
by femto 6y ago
Clone the srsLTE repository [1], and use it to set up a demonstration system with a core network (srsEPC), base station (srsENB) and a mobile phone (srsUE). It's several hours work to set up a system that runs on a couple of Virtual M
742.
by femto 6y ago
Perhaps the cost-benefit analysis should also include improvements in the technology to develop vaccines as a benefit? There's a good chance that the injection of resources into the development of COVID-19 vaccines will put us in a be
743.
by femto 6y ago
It's got multiple personalities, which are at battle with each other. The party was founded as a party of social liberals (with conservative economics), but for the last 3 decades has been eaten from the inside by a socially conservati
744.
Solar farm in Australia could power Singapore via 4,500km undersea cable(abc.net.au)
22 points by femto 6y ago|20 comments
745.
by femto 6y ago
I notice that the padlocks generally have laminated steel bodies, and are not solid brass. Presumably the procedure is to remove the rivets in the body, separate the laminations and feed each one in separately, then reassemble everything i
746.
by femto 6y ago
Meanwhile New Zealand looks at Australia, pulls out their own biosecurity system and says "That's not a biosecurity system. That's a biosecurity system.
747.
by femto 6y ago
Are those numbers correct? In the worst case, the chord would be the diameter and the great circle would be half the circumference, so the ratio would be (pi.d/2)/d = pi/2 = 1.57. For fun the cos rule can be used to derive a
748.
by femto 6y ago
And the related, more general, risk of an additional external dependency: what happens if the service disappears, changes or goes wrong?
749.
by femto 6y ago
Look at some of the narrow band radio standards. P25 standards are not freely available, but DMR standards can be freely downloaded from ETSI [1]. P25 with 56-bit DES is well and truly broken, but I gather 256-bit AES is still okay. Also
750.
by femto 6y ago
Can VLBI be done with a single moving telescope, with a very precise clock? I'm thinking of a single frequency point source in space. The received signal will be periodic. Thus we can move the receiver to a new point in space and sti

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