femto

38 ms·

601.
by femto 5y ago
And if we get two photons above a certain energy and slam them together we get an electron and a positron. So where did they come from and where did the photons go? The electron emits a photon: photons from photons. And all those virtual
602.
by femto 5y ago
Thank you. I hope you all stay safe.
603.
by femto 5y ago
Maybe it's an inane question, but what's it like? Which aspects of your life have some normality and which don't?
604.
by femto 5y ago
Fair enough to create a device/vendor independent format for describing FPGA resources, but why not use EDIF [1] for the logical and physical netlists? [1] https://en.wikipedia.org/wiki/EDIF
605.
by femto 5y ago
Not twitter, but the same topic: https://www.abc.net.au/news/2022-01-18/returning-to-exercise...
606.
by femto 5y ago
I once worked with someone who went from "not rich" to "rich", who also ending up in a senior position at Cisco where he had the authority to spend lots of money. His observation was that a "normal" person has
607.
by femto 5y ago
Context: the case is being run by Andrew 'Twiggy' Forrest, a local billionaire, so there is a bottomless pit of money available for lawyers. A criminal breach of money laundering laws is being alleged. As an example of the possi
608.
by femto 5y ago
With decent processing a mm-wave picture would be good enough that you could recognise a person, so I don't think there is any inherent anonymity. The image resolution is a function of both wavelength and aperture and a mm-wave antenn
609.
by femto 5y ago
What’s your view on whether self-driving cars should automatically be 100% liable for any accidents? I ask this in the context of machines being governed by classical deterministic physics, so there is an argument that there is no such thin
610.
by femto 5y ago
Here's the Venera 14 audio, referred to in the article. https://www.youtube.com/watch?v=8jZDW53U8qQ https://youtu.be/P3Ife6iBdsU?t=132
611.
by femto 5y ago
Box girders in a concrete bridge are hollow, meaning a measurement system could be inside where it is dark.
612.
by femto 5y ago
A slightly dissonant title on the article, as the premise of the article is that the Old Internet never went away. Rather, more people are beginning to discover that the Old still exists as they reach the limits of the New and start lookin
613.
by femto 5y ago
I'd argue that incremental change strikes the balance between tearing something down and being paralysed by potential consequences. Also, you can only learn so much by passive observation. Eventually you have to apply a small stimulu
614.
by femto 5y ago
The 'z' key allows you to zoom to an arbitrary box, including magnifications that are not possible with scrolling. 'u' provides a URL for direct linking to a region. More keys are in the scripts, but these seem to be th
615.
by femto 5y ago
The implication is that the image tiles are overlapped, so the edge of one tile falls near the center of another. That might provide enough parallax information to do a 3D reconstruction. I wonder if the raw images and metadata are availa
616.
by femto 5y ago
It doesn't approach it from a thermodynamic perspective, but the following paper summarises the duality between electrics, hydraulics, acoustics and mechanics: SchÖnfeld, J. C. (1954). Analogy of hydraulic, mechanical, acoustic and ele
617.
by femto 5y ago
Electrics, Acoustics, Hydraulics, Mechanics, ... They are all mathematical duals of each other. Just the terminology is different in each field (pun?). James Clerk Maxwell, who wrote down the fundamental equations for electromagnetism, al
618.
by femto 5y ago
Aboriginal oral tradition is often an accurate historical record: https://www.abc.net.au/news/2015-10-16/research-gives-merit-... As the article notes, oral tradition has "error correction" built into it
619.
by femto 5y ago
Perhaps a solution is to put a detailed description of what is under the hood into the owner's manual (photos, block diagram, schematics, ...)? After all, the main reason for opening the hood is probably curiosity, to have a look. Sat
620.
by femto 5y ago
It currently costs €69. https://freedombox.org/buy/
621.
by femto 5y ago
Gavin Smith (Robots and Dinosaurs) has a theory that they are calendars. He has an interesting series of articles in which he tries to recreate their use. https://tinkerings.org/2020/06/17/roman-dodecahedrons
622.
by femto 5y ago
From a signal processing perspective: being able to recognise signals in the presence of interference, noise and distortion. For example, you might have a radio signal (such as WiFi) that you want to receive. First step is that you have to
623.
by femto 5y ago
From a purely theoretical point of view, if there was a perfect feedback control loop the energy of the explosion could be controlled to bring the front of both vehicles to a perfect stop. Both vehicles would then crumple about that statio
624.
by femto 5y ago
One wonders whether there is a place for "Active Crumple Zones"? Instead of a car having to weigh more that the opposition, it carries an explosive charge in it's nose, which is used to provide a burst of forward momentum to
625.
by femto 5y ago
Australia's Telstra has reversed its position on closing phone boxes, as they have now realised the value of the real estate they occupy. They are now placing 5G base stations and WiFi access points on phone boxes, and have a bonus re
626.
by femto 5y ago
A seal is supposed to be difficult to counterfeit: https://www.reddit.com/r/AskHistorians/comments/4xqfs0/how_w... As such, there is an argument that a seal refers to a physical object with physical impe
627.
by femto 5y ago
Here's the download link for the Without Hot Air book: http://www.withouthotair.com/download.html The parent's link was for his other book "Information Theory, Inference, and Learning Algorithms", which
628.
by femto 5y ago
You may be interested to know about Costas Group in Australia. They have gone the high tech route, cramming every bit of productive technology into their greenhouses. They are an established company listed on Australia's stock exchan
629.
by femto 5y ago
S/N for a cassette is variously given as 50dB, 58dB or 67dB [1,2]. Bandwidth is given as 12kHz (standard), 16kH (medium Fi), 19kHz (HiFi) for different quality cassette systems [3]. Let's simplify by assuming the frequency cutof
630.
by femto 5y ago
Hence the reason for standards. Here's an intro: "Classified Facility Communications Cabling Infrastructure Design Basics" https://www.bicsi.org/docs/default-source/conference-present...

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