LED Tom

Big Screen trainer, designer, fixer, mixer. Inventor of the ZEUS eco LED power system. ZEUS your screen!

[LED Tom @LED_Tom]

@saylor @LaDoger @Strategy Couldn’t help noticing on the BBC thing morning that Anne Boleyn was into the same thing! ( second photo ) https://t.co/tIj1VJOKmj

[Windpower Monthly @windpower_m]

Seven US states’ attorneys general are suing the Trump administration over what they call the government’s “unlawful” cancellation of TotalEnergies’ offshore wind lease off the coast of New York
#windpower #renewables #energytransition
https://t.co/nfoOGMOQqN

[Space Vulture ⚡️ @slvulture]

SpaceX Starship will launch Blue Moon Mk1 “Endurance” to help Blue Origin maintain their goals for the Artemis III mission in 2027

[Bull Theory @BullTheoryio]

BREAKING: Google is planning to release 32 million mosquitoes across Florida and California.

The company has asked the EPA for permission to proceed, with the public given until June 5 to respond.

The mosquitoes are infected with Wolbachia bacteria, which stops them from reproducing and slowly collapses the wild population from within.

Google's previous Debug Project trial in California's Central Valley nearly eliminated mosquitoes from three test sites entirely. A separate trial in Singapore cut dengue cases by 70% within 12 months.

Google has now released over 1 billion mosquitoes across four continents. This new proposal is the largest deployment in US history.

[SenhorZiborro @SenhorZiborro]

Quando você não tem pendrive ou rede e precisa transferir os arquivos de qualquer modo 🤯🤯🤯

[𐌁𐌉Ᏽ 𐌕𐌉𐌌𐌉 @OrevaZSN]

Idea: An anonymous “vote to end meeting” button on Teams where if 50% of people press it, the meeting ends immediately.

[Meg McNulty @meggmcnulty]

For decades, data center racks have been powered by three-phase AC, the same kind of power that runs industrial machinery. NVIDIA's next AI rack uses 800-volt DC instead, the same standard NVIDIA itself credits to the electric vehicle and solar industries.

The change re-architects how electricity moves from the grid to the GPU, and three things at the silicon level had to happen first.

1️⃣ Doubling the voltage halves the current for the same power delivered, which cuts resistive losses in copper by roughly 75 percent. NVIDIA's design partners estimate copper thickness can drop by up to 45 percent across the rack. A 1MW rack needs up to 200kg of copper busbars at the legacy 54-volt distribution standard. A single 1GW data center built that way would need up to 200,000kg of copper for rack busbars alone, per NVIDIA's own technical blog.

2️⃣ The power semiconductors needed to convert 800 VDC efficiently at the rack level matured only in the last few years. Silicon carbide handles the high-voltage front-end conversion from medium-voltage utility AC down to 800 VDC. Gallium nitride handles the high-frequency stepdown from 800V to intermediate buses (50V, 12V, or 6V) feeding the GPU. Both are wide-bandgap technologies. SiC scaled because of the EV industry, where Porsche, Hyundai, Kia, and BYD have built the 800V powertrain supply chain over the last five years. GaN scaled on the back of consumer fast-charging and is now being adapted for AI infrastructure.

3️⃣ AC-to-DC conversion moves out of the IT rack entirely. In a current GB200 NVL72 or GB300 NVL72, up to eight power shelves sit inside the rack converting AC to DC. At MW scale on the same standard, those shelves would consume up to 64U of rack space, leaving no room for compute. In the 800 VDC architecture, conversion happens once at a dedicated power shelf upstream, and the IT rack receives DC directly. NVIDIA estimates this delivers up to 5 percent end-to-end efficiency improvement and up to 70 percent reduction in PSU-related maintenance costs.

Power semiconductor content per rack grows substantially across this transition. SiC and GaN suppliers, high-voltage busbar and connector vendors, and rack-level DC-DC converter makers gain share. The legacy low-voltage and multi-stage AC conversion stack loses share.

Most colocation facilities today operate at 10 to 30 kW per rack. The 600kW Rubin Ultra rack is more than an order of magnitude above that. The math operators are working on for 2027 deployments is whether their existing PDUs, busways, and rack power shelves are even compatible with the new spec.

[TheNewPhysics @CharlesMullins2]

🚨 Scientists just built a refrigerator with NO compressor and NO refrigerant gas.

Just electricity.

Using a multilayer ceramic capacitor, researchers created a solid-state cooling system that changes temperature when an electric field is applied.

The result:
• ~3–4.5 K cooling swings
• works across room temperature
• survives >10 MILLION cycles
• no moving parts
• projected 70–90% Carnot efficiency

This is electrocaloric cooling and it may become one of the biggest threats to conventional refrigeration in decades.

Older materials only worked ABOVE room temperature and needed a brutal 42-day annealing process.

This new PST–PMW material:
• cools down to ~230 K
• avoids the expensive anneal
• handles massive electric fields
• maintains strong entropy transitions

The physics is beautiful.

An electric field reorganizes the material’s internal dipole structure, reshaping entropy inside the lattice and producing a real temperature drop.

Not “cold generation.”
Controlled entropy engineering.

If this scales:
• silent refrigerators
• ultra-efficient chip cooling
• vibration-free scientific systems
• wearable thermal control
• next-gen EV cooling

We may be watching refrigeration evolve from mechanical compression…
to programmable matter.

Follow me if you want the future of physics before it hits mainstream.

[The EV Puzzle @EVPuzzle]

World’s Biggest Wind Farm off Norfolk coast has its fibre opic cable connected🤝, won't be long until it's powering 3.3m UK homes, linked up to one the biggest Tesla giga batteries just outside Norwich

Norfolk, a growing renewable hotspot in world news

https://t.co/G97mvsjEbT

[Founders Inc @fdotinc]

He reinvented the 3D printer

Introducing the polysynth mini:

[LED Tom @LED_Tom]

@British_Airways
You absolute puss-weeping gangrene sacks! You cancelled my Executive Club tier 1 month after letting me keep silver. That really is scumsuckingly bottom feeder of you.
FYI, my company’s work travel to Hong Kong, Australia and America: You’ve now lost. Goodbye.

[Brian Roemmele @BrianRoemmele]

Danael - Kebab Symphony.

Discovered by an accident while working at a gyro machine…

[SciTech Era @SciTechera]

This is big. Really big.

Scientists have just created a molecule that can store sunlight like a rechargeable battery.

In a new study published in Science, researchers designed a pyrimidone based system that captures solar energy and locks it into a high energy form called Dewar pyrimidone.

When exposed to UV light (~300 nm), the molecule undergoes photoisomerization, transforming into a strained structure that stores energy in its chemical bonds.

What makes this powerful is that the energy can be stored for years and then released on demand as heat, simply by triggering the molecule with heat or an acid catalyst 👀

The system achieves an energy density of ~1.6 MJ/kg, which is nearly 2× higher than lithium-ion batteries.

In experiments, the stored energy was strong enough to boil water in seconds, proving it’s not just theoretical.

The molecule is also inspired by DNA chemistry, designed to be compact, stable, and even work in water-based environments.

This is part of a growing field called Molecular Solar Thermal (MOST) energy storage, where the material itself acts as a solar battery.

Instead of converting sunlight into electricity, it stores it directly as chemical energy.

We’re starting to move toward a world where sunlight isn’t just used instantly.. but saved, transported, and released whenever we need it.

Welcome to fastest accelerating SciTech Era ♥️

[outside five sigma @jwt0625]

brutal difference between simulated and measured beam from an inverse designed universal grating coupler / emitter

(tantala on silica for visible wavelengths, universal in terms of polarization including its spatial distribution)

[LED Tom @LED_Tom]

@XFreeze And the real time voice translation from Grok is a game changer. I’ve just completed 2 weeks in China. For the first time in a hundred visits, I was able to naturally chat with locals - all through Grok. Total revelation !

[Math Files @Math_files]

The first formula that allows the calculation of the n-th decimal digit of π—without needing to compute all the previous digits—was discovered by Simon Plouffe in 2022.

[Akiyoshi Kitaoka @AkiyoshiKitaoka]

Who is it?

[Pieter Ibelings @ibelings]

Testing per-sample IQ Doppler correction in SpectraFlux. Satellite tracking software sends frequency updates via rigctld — instead of retuning the SDR (which causes PLL transients and audio glitches), the correction is applied as a phase-continuous NCO rotation on every IQ sample. SDR parks at a clean center frequency, Doppler offset handled entirely in the digital domain. Zero retune latency, no phase discontinuities. Here's a Python script driving a ±50 kHz sinusoidal S-curve through rigctld while the spectrum tracks it smoothly.

SpectraFluxのIQドップラー補正をテスト中。 衛星追尾ソフトからrigctldで周波数更新を受信し、SDRの再チューニングではなく、IQサンプルごとにNCO位相回転で補正を適用。PLLの過渡応答やオーディオの途切れがゼロ。Pythonスクリプトで±50kHzの正弦波ドップラーカーブをシミュレーションしています。