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Chemical process produces critical battery metals with no waste

https://spectrum.ieee.org/nmc-battery-aspiring-materials
45•stubish•2h ago•3 comments

Fast and cheap bulk storage: using LVM to cache HDDs on SSDs

https://quantum5.ca/2025/05/11/fast-cheap-bulk-storage-using-lvm-to-cache-hdds-on-ssds/
50•todsacerdoti•3h ago•11 comments

Smallest particulate matter sensor revolutionizes air quality measurement

https://www.bosch-sensortec.com/news/worlds-smallest-particulate-matter-sensor-bmv080.html
27•Liftyee•3h ago•4 comments

Resizable structs in Zig

https://tristanpemble.com/resizable-structs-in-zig/
109•rvrb•9h ago•48 comments

A low power 1U Raspberry Pi cluster server for inexpensive colocation

https://github.com/pawl/raspberry-pi-1u-server
16•LorenDB•3d ago•6 comments

Show HN: QuickTunes: Apple Music player for Mac with iPod vibes

https://furnacecreek.org/quicktunes/
70•albertru90•7h ago•18 comments

How we rooted Copilot

https://research.eye.security/how-we-rooted-copilot/
289•uponasmile•14h ago•110 comments

Purple Earth hypothesis

https://en.wikipedia.org/wiki/Purple_Earth_hypothesis
211•colinprince•3d ago•58 comments

Low cost mmWave 60GHz radar sensor for advanced sensing

https://www.infineon.com/part/BGT60TR13C
58•teleforce•3d ago•22 comments

Personal aviation is about to get interesting (2023)

https://www.elidourado.com/p/personal-aviation
81•JumpCrisscross•7h ago•80 comments

Rust running on every GPU

https://rust-gpu.github.io/blog/2025/07/25/rust-on-every-gpu/
523•littlestymaar•20h ago•176 comments

Paul Dirac and the religion of mathematical beauty (2011) [video]

https://www.youtube.com/watch?v=jPwo1XsKKXg
55•magnifique•8h ago•4 comments

16colo.rs: ANSI/ASCII art archive

https://16colo.rs/
20•debo_•3d ago•4 comments

Coronary artery calcium testing can reveal plaque in arteries, but is underused

https://www.nytimes.com/2025/07/26/health/coronary-artery-calcium-heart.html
67•brandonb•9h ago•57 comments

What went wrong for Yahoo

https://dfarq.homeip.net/what-went-wrong-for-yahoo/
155•giuliomagnifico•12h ago•149 comments

Getting decent error reports in Bash when you're using 'set -e'

https://utcc.utoronto.ca/~cks/space/blog/programming/BashGoodSetEReports
101•zdw•3d ago•30 comments

The natural diamond industry is getting rocked. Thank the lab-grown variety

https://www.cbc.ca/news/business/lab-grown-diamonds-1.7592336
183•geox•18h ago•224 comments

Teach Yourself Programming in Ten Years (1998)

https://norvig.com/21-days.html
70•smartmic•9h ago•24 comments

Torqued Accelerator Using Radiation from the Sun (Tars) for Interstellar Payload

https://arxiv.org/abs/2507.17615
47•virgildotcodes•8h ago•4 comments

Tinyio: A tiny (~200 line) event loop for Python

https://github.com/patrick-kidger/tinyio
66•tehnub•4d ago•14 comments

Where are vacation homes located in the US?

https://www.construction-physics.com/p/where-are-vacation-homes-located
86•rufus_foreman•12h ago•69 comments

Arvo Pärt at 90

https://www.theguardian.com/music/2025/jul/24/the-god-of-small-things-celebrating-arvo-part-at-90
66•merrier•9h ago•19 comments

Shallow water is dangerous too

https://www.jefftk.com/p/shallow-water-is-dangerous-too
109•surprisetalk•3d ago•66 comments

Janet: Lightweight, Expressive, Modern Lisp

https://janet-lang.org
18•veqq•5h ago•2 comments

Test Results for AMD Zen 5

https://www.agner.org/forum/viewtopic.php?t=287&start=10
220•matt_d•12h ago•42 comments

Large ancient Hawaiian petroglyphs uncovered by waves on Oahu

https://www.sfgate.com/hawaii/article/hawaii-petroglyphs-uncovered-20780579.php
79•c420•4d ago•23 comments

Asyncio: A library with too many sharp corners

https://sailor.li/asyncio
84•chubot•7h ago•67 comments

Millet mystery: A staple crop failed to take root in ancient Japanese kitchens

https://phys.org/news/2025-07-millet-mystery-staple-crop-root.html
25•PaulHoule•3d ago•9 comments

Open Sauce is a confoundingly brilliant Bay Area event

https://www.jeffgeerling.com/blog/2025/open-sauce-confoundingly-brilliant-bay-area-event
329•rbanffy•3d ago•186 comments

Font-size-adjust Is Useful

https://matklad.github.io/2025/07/16/font-size-adjust.html
164•Bogdanp•3d ago•51 comments
Open in hackernews

Algorithm for simulating phosphor persistence of analog oscilloscopes

https://richardandersson.net/?p=350
23•pillars•2d ago

Comments

jwrallie•7h ago
That looks very cool. I have fond memories of working with analog oscilloscopes.

I started college in 2007, and they handled us newbies in EE analog oscilloscopes for learning, as it does not have the (in)famous auto-scale button.

Working with other engineers, I’m still the one that can handle an oscilloscope the best.

We can derive many parallels in education challenges arising from introduction of new automated functions in tech.

jeffbee•6h ago
There were analog scopes with auto scale, though. My Tek 2465A has the AUTO button prominently featured. Analog scopes and computerized/automated scopes overlapped in history. The 2465A even had firmware updates.
kevin_thibedeau•5h ago
Auto setup was introduced on the 2465B. A-series has the updated buttons and unlabeled timebase knobs.
jeffbee•5h ago
My 2465A clearly has auto-scaling. I would know since I've owned it for thirty years. I believe the differences to the B are 350 vs. 400MHz, and the Sony CRT.

You can get the 2465A operator manual online to see for yourself.

analog31•3h ago
As a grad student in 1986, I was a TA for freshman physics lab, and an obligatory rite of passage was the notorious "oscilloscope lab." The other TA, and the professor, were both theoreticians. I was the only grad student with any electronics experience, because it was my hobby. Still is.

We had a large lab room full of about 30 scopes and signal generators, most of which had flaky controls. No explanation was given beforehand (that any of the students read, at least), and there wasn't time to explain things like how or why the scope shows a stable display of a time-varying waveform.

And because of the behavior of the controls, no explanation was believable.

It was a debacle.

As for phosphor-like digital displays, I wonder how many patents Tektronix has on the concept. Many of them are probably expired by now.

Dwedit•7h ago
Don't forget the "Youscope" scene demo, another XY mode signal made to be displayed on oscilloscopes.

https://www.pouet.net/prod.php?which=31592

Unlike the "Oscillofun" song though, the scope signal is not the same as the audio signal.

gus_massa•6h ago
In my secondary school, we had two contiguous rooms with computers. One has the modern one, color screen with Windows 3.1 or something.

The other room had the old computers, a monochrome white monitor, perhaps an orange Hercules monitor and also the old green one. In the green monitor the phosphorus took a looong time to fade away. When you turn it off, you can still read the content of the screen for like five seconds.

Keyframe•3h ago
Cool! I tried to put it into my experimental tetris-like game here https://www.susmel.com/stacky/ - you can press R to have it rendered as such, toggle R once again for amber on black more and R again to normal render mode.
Dwedit•3h ago
Is the phosphor supposed to take an entire second to fade from solid?
Keyframe•3h ago
It depends on multiple factors from substrate to the strength of the beam. I've seen older age oscilloscopes that took even more. The beauty of those machines, no two alike.