femto

68 ms·

931.
by femto 9y ago
Harmonics are multiples of the fundamental, so in this case they will also be ultrasonic. Equation 2 in the paper and the subsequent paragraph shows what is going on. They use an ultrasonic carrier with modulation. The non-linearity cause
932.
by femto 9y ago
Yes it does: https://makezine.com/2008/10/08/homebrew-parametric-speak/ http://www.soundlazer.com/ It's reasonably consistent. Differences in non-linearity will result in different
933.
by femto 9y ago
It's happening at the hardware level, so there is potentially limited scope to fix it in software. My guess is that when the author refers to "harmonics" they are really talking about intermodulation. The idea is that if you
934.
by femto 9y ago
A layman's explanation in the press release: https://newsroom.unsw.edu.au/news/science-tech/flip-flop-qub... Edit: Also being backed by a new company: "Silicon Quantum Computing Pty Ltd". https:&#x
935.
by femto 9y ago
There's a story there... Yes, the antenna made famous by "The Dish", as the antenna that received the first footsteps from the Moon is 300km away at Parkes. However, the movie took some license with the truth so the antenna
936.
by femto 9y ago
I'd say it's unclear rather than wrong, and what you say is perfectly correct. Decibels are useful when dealing with exponential decay, meaning that the output of a process is always proportional to its input. An inverse square
937.
by femto 9y ago
Neat to see that optical is the new RF, in that it is using coherent modulation techniques that were once restricted to radio. In a similar vein, RF is also the new baseband (like audio and video before), in that the lower ends of RF (VHF
938.
by femto 9y ago
The "Internet Mobile Host Protocol" (IMHP) was written as a draft RFC in 1994. As far as I know it was never adopted, but is it still relevant, even as an inspiration for IPv6? [1] https://www.cs.rice.edu/~dbj&#x2
939.
by femto 9y ago
A largely independent analysis of the implications of the study, putting to rest some of the hype: http://www.abc.net.au/news/2017-08-10/what-the-news-about-b3... A key quote: "most miscarriages are caused by
940.
by femto 9y ago
The Science article: http://www.sciencemag.org/news/2017/08/vitamin-b3-could-help... is less breathless, with the comment: "Of course, more human studies are needed before doctors could recommend B3 supp
941.
by femto 9y ago
The paper: http://www.nejm.org/doi/full/10.1056/NEJMoa1616361
942.
Historic Discovery Promises to Prevent Miscarriages and Birth Defects Globally(victorchang.edu.au)
1 points by femto 9y ago|4 comments
943.
by femto 9y ago
Thanks. That makes sense, as a licensee signs a contract, so they will be governed by the terms of the contract, and the contract can presumably be written to outlast the patent. It suggests to me that when a patent expires then licensees
944.
by femto 9y ago
I've never understood why some people say a license is needed for something on which patents have expired. What's the legal basis, or is it bluff? I can understand that copyright exists in the documentation that describes AXI, bu
945.
by femto 9y ago
If there is a licensing problem with AXI, would Wishbone be a viable alternative [1]? [1] https://en.wikipedia.org/wiki/Wishbone_(computer_bus)
946.
by femto 9y ago
Seeing the parallels with Australia [1] [2], I'd suggest that the Chinese Student and Scholar's Associations are exacerbating the situation for Chinese students. The CSSA's influence puts the locals on the defensive and make
947.
by femto 9y ago
I've sent an email to the address in your profile.
948.
G20 summit: Malcolm Turnbull to urge Donald Trump to act against tech terrorists(smh.com.au)
3 points by femto 9y ago|0 comments
949.
by femto 9y ago
I struggled for ages with trying to keep "good posture", trying to position each part of my body correctly (shoulders back, etc). Once the importance of core muscles was pointed out to me, I saw that all I need to do was "tu
950.
by femto 9y ago
Agree that weight/load is an issue. In my experience, a measurable side effect of a daily routine is some weight loss, which if nothing else provides motivation for continuing.
951.
by femto 9y ago
I can personally vouch for the effectiveness of a morning routine of 15 minutes of exercise at home, targeting the pelvic muscles. The only equipment required is a floor mat, if the floor is hard. I started gently and naturally progressed
952.
by femto 9y ago
I'd encourage Australians to submit a privacy complaint. Every chance it will be "just for laughs", but never know, it might get a coherent response. The URL with the Department of Human Services is: https://www.h
953.
by femto 9y ago
There is an option on the page for those without a MyGov ID. The direct link is: https://feedback.humanservices.gov.au/mcasite_feedback/feedb...
954.
by femto 9y ago
Submit your privacy complaint here: https://www.humanservices.gov.au/customer/contact-us/submit-... When you don't get a satisfactory response from the Department of Human Services within 30 days, escalate yo
955.
by femto 9y ago
There are ways to mitigate such attacks at the operating system level, as explored in the following link? https://ts.data61.csiro.au/projects/TS/timingchannels.pml
956.
Volvo's Driverless Cars Can't Figure Out Kangaroos(gizmodo.com.au)
4 points by femto 9y ago|0 comments
957.
by femto 9y ago
US based only? A pity. People had a pretty good go at this in the early 2000s, when WiFi arrived on the scene. Most of those networks died and the ones that remain never took over the world [1]. The sticking points in the efforts that I
958.
by femto 9y ago
Best thing is to just jump in and do it. You don't even need hardware to start with. If you're seriously interested, download Octave (Matlab replacement) and write a program from scratch to simulate a BPSK system and generate a &
959.
by femto 9y ago
Virtually every professional radio is software defined to some extent these days, so every company that designs radios wants signal processing and information theory skills, more so if they are doing proprietary protocols rather than implem
960.
by femto 9y ago
But...if a public that doesn't understand the nature of backdoors is fearful of the consequences of backdoors being cracked, it's a short step to turn attempts to crack the backdoor into something terrifying, in which case an atte

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