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#detector

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The Department of Homeland Security has administered
#lie #detector tests to about
50 staffers in recent weeks,
including FEMA’s acting administrator
and roughly a dozen officials at the disaster relief agency,
as part of an intensifying effort to root out what the department alleges are leaks of national security information

msn.com/en-us/news/us/dozens-o

www.msn.comMSN

Smoke alarm (optical) from #AliExpress failed the smoke test. It feeps loudly when pushing the test button, but when held into some nice fire smoke, it does exactly nothing, despite patience.

So always test with a real life scenario. The test button only checks the batteries and the beeper are working, not the actual sensor.

I sent them a nice video and expect a refund. This isn't because it's from China, the same can happen with any.

#Harvard #Natural #Sciences #Cloud #Chamber

…"The trajectories of individual charged #particles leave behind #cloudy trails as they #ionize the cooled, supersaturated air-alcohol vapor inside this diffusion #cloudChamber. Alpha particles from the #radioactiveDecay of an inserted 2% #thorium alloy rod form dense condensation trails nearby"…

(Read the entire text on the Youtube page.)

🔗 youtube.com/watch?v=e3fi6uyyrE 06 Mar 2014
🔗 en.wikipedia.org/wiki/Cloud_ch

Replied in thread

$20 Tankpower 1650lb Break Strenth Ratchet Tie Down Straps (Blue or Green)
amazon.com/dp/B0CBDRS1DJ

$17 1 gallon Rust-Oleum #Jomax 308764 Spray Once
dealigg.com/story-Rust-Oleum-J

$14 Vevor 60-Piece Carbon Steel Pipe #Threader #Tap&Die Set
amazon.com/dp/B0CLTVY3K7

$40 VEVOR WI-FI Smart Water Monitor & Automatic Shutoff Detector,
3/4" NPT Dia Pipe #WaterLeak #Detector, 2.0-4000 L/H Range w/App Alerts
amazon.com/gp/product/B0D2KKC8

We have a new winner in terms of #AI content detection accuracy! The https://contentatscale.ai/ai-content-detector/ #detector is impressive in its accuracy, despite being more than 200x slower than #ZipPy. Also shown in this new #ROC chart is the comparison between #zlib at maximum compression setting vs. #LZMA at a low preset (2). zlib is faster (especially in the #browser with native #CompressionStream support), but not quite as performant.

Gravitational waves produce a background hum across the whole universe |

The fabric of the universe is constantly rippling, according to astronomers who have discovered a background buzz of #gravitational #waves. These waves may be produced by #supermassive #black #holes merging across the universe, but they might also have more exotic origins, such as leftover ripples in space-time created shortly after the #big #bang.

Pinning down their true nature could tell us about how supermassive black holes grow and affect their host galaxies, or even about how the universe evolved in its first moments.

To find this mysterious hum, astronomers have been tracking rapidly rotating neutron stars called #pulsars that blast out light with extreme regularity. By looking at different pulsars across the Milky Way, astronomers can effectively use them as a galaxy-sized gravitational-wave #detector called a pulsar #timing #array.

While individual gravitational waves, which are ripples in space-time created by massive objects colliding, have been seen regularly since the first detection in 2015, the object of this search is different. Those previous gravitational waves all have a #localised origin and rise and fall hundreds of times a second, but the newly-discovered signal is more like a gravitational wave #background that would permeate the entire universe at much #lower #frequencies, similar in concept to the cosmic microwave background, which is radiation left over by the big bang and seen all over the universe today.

newscientist.com/article/23804

New ScientistGravitational waves produce a background hum across the whole universeBy Alex Wilkins
Continued thread

Here's a #photo (ultra-#wideangle #16mm), taken from within the #GINIX #Synchrotron #Experiment @DESY into the crowd of visitors.

On the left, Prof. Salditt explains the setup and the measurement scheme. In the bottom part, left of the yellow knob, is the sample tower; slightly left from the centre, parts of the #detector (blue camera labelled “PCO”) are visible; towards the rear, a big evacuated flight tube help the #XRays to reach the second detector bench.

Also, lots of #cables hang around.

On the track of the #BigBang: The most sensitive #detector for measuring #radioactivity is now in Dresden - What is #darkmatter? What are #neutrinos all about? How do #stars work and what was actually going on in the #universe in the first minutes after the #BigBang? To answer these questions, you need very sensitive detectors and a lot of skill.

phys.org/news/2023-02-track-bi

Phys.orgOn the track of the Big Bang: The most sensitive detector for measuring radioactivity is now in DresdenBy Science X