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🧵 Like clouds, #contrails form when water (H2O) condenses on tiny particles in the air. 💦☁️ Gas turbine (jet) engine exhaust 💨contains particles (carbon/soot)🚬 from the combustion of fuel & oxygen. This exhaust plume is about 400C 🔥 rushing out into -50C❄️ ambient air…..

106,652 views • 1 year ago •via X (Twitter)

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Jet Fuel is a fascinating story. We don’t measure it in litres, we measure it in weight, because fuel expands/contracts with temperature while weight stays constant. Jet fuel’s specific gravity is ~0.8, so 1 litre ≈ 0.8 kg (lighter than water). It’s also worth noting that jet fuel is essentially a highly refined kerosene, far less volatile than gasoline, which makes it safer to handle in large quantities. On a long-haul, fuel can be close to half the aircraft’s total weight at departure. On the A350-1000, that can be ~129 tonnes. At most major international airports, this much fuel doesn’t turn up in a tanker. It’s stored in a depot and delivered through a network of underground hydrant pipes to each stand. The “tanker” you see is really a pump truck connecting the hydrant to the aircraft and metering the exact uplift. When I moved from the A340-600 to the A350-1000, one of the things that struck me most was just how much simpler and smarter the fuel system became and how much less fuel we required for the same journeys. On the A340-600, we needed a rear trim tank in the tail to keep the aircraft in balance during cruise. It worked beautifully, but it added complexity. The A350 doesn’t need that, instead, it uses tiny fractions of flap in cruise, together with the latest wing aerodynamics, to keep perfectly in trim. London → New York comparison (typical figures): - A340-600: ~80–90 tonnes of trip fuel - A350-1000: ~50–60 tonnes of trip fuel That’s roughly 30–40% less fuel, saving ~25–30 tonnes on a single flight, which also means about 80–95 tonnes less CO₂ (rule of thumb: 1 tonne of jet fuel ≈ 3.16 tonnes CO₂) 📸 by ig/captainchris

aircraftmaintenancengineer

509,252 views • 10 months ago

:Scientists Capture the Birth of Water, Atom by AtomFor the first time ever, researchers have directly observed hydrogen and oxygen atoms combining in real time to form tiny nanoscale bubbles of water—essentially witnessing one of chemistry’s most fundamental reactions at the molecular early 2024, a team from Northwestern University unveiled a groundbreaking imaging technique that traps gas molecules inside tiny, honeycomb-shaped nanoreactors sealed by ultra-thin glassy membranes. This innovation allows scientists to observe chemical processes in real time using high-vacuum transmission electron microscopes, something previously impossible for gaseous reactions.The team, led by Professor Vinayak Dravid and including first author Yukun Liu, turned their attention to a century-old puzzle: how palladium—a rare metallic element—acts as a powerful catalyst to rapidly combine hydrogen and oxygen into water As Yukun Liu explained: “It’s a known phenomenon, but it was never fully understood. You really need both direct visualization of the reaction and atomic-level structural analysis to figure out exactly what’s happening.”What they saw was astonishing.Using their nanoreactor platform, the researchers watched hydrogen atoms diffuse into a palladium nanocube, causing its crystal lattice to expand slightly. Then, when oxygen was introduced, the gases reacted at the surface. Suddenly, tiny water bubbles began to nucleate and grow right before their eyes on the palladium surface.“We think it might be the smallest bubble ever formed that has been directly viewed,” said Liu. “It’s not what we were expecting. Luckily, we were recording it—so we could prove to others that we weren’t crazy.” The bubbles were confirmed to be water using electron energy-loss spectroscopy and heating experiments. Remarkably, the reaction occurs efficiently at room temperature, and palladium itself is recyclable—it doesn’t get consumed in the process. The order in which the gases are introduced also plays a key role in the speed of water formation.This direct, atomic-scale observation not only solves a long-standing mystery in catalysis but could also inspire new technologies: from more efficient ways to generate clean water in remote or arid environments to improved hydrogen fuel cells and even systems for producing water in space.What once seemed like “water from thin air” is now literally visible—captured in stunning detail at the nanoscale. This breakthrough highlights how advanced imaging tools are unlocking secrets of matter that have remained hidden for generations.The study was published in the Proceedings of the National Academy of Sciences (PNAS) in 2024.

Black Hole

31,895 views • 2 months ago

There's a bacteriophage that turns bacteria into “liquid crystals.” Specifically, Pseudomonas aeruginosa bacteria make Pf phages, which are rod-shaped, negatively-charged, and measure about 2 micrometers in length (roughly the length of an E. coli cell). These phages leave the cells and enter their surroundings. There, they mix with polymers, also secreted by the cells, to form a crystalline matrix. Surprisingly, this is good for the cells. Although the phages kill some of them, it also makes their biofilms stickier and able to withstand certain antibiotics. These bacteria + phages are prevalent in cystic fibrosis patients; they've formed a sort of symbiotic relationship. The Pf phages are made from thousands of repeating copies of a coat protein, called CoaB, which wraps around a single-stranded, circular DNA genome. These genes are integrated directly on the bacterial chromosome. The bacteria “turn on” these phage genes when placed in a viscous environment with low oxygen levels. This is like a trigger to start forming a biofilm. And the cells make a lot of phages; about 100 billion per milliliter. These liquid crystals form because of a physics principle called “depletion attraction.” If you just mix a bunch of loose or flexible polymers together (such as long carbon chains) they will not form a liquid crystal. But if you mix stiff rods (the phages) with loose polymers at a high enough concentration, the polymers will force the phages close together to create a material that flows like a liquid despite being ordered like a crystal. See the video below. These liquid crystal biofilms are hard to get rid of. The negatively-charged phages block many antibiotics (like aminoglycosides, which are positively-charged) from entering cells. Liquid crystals also retain water, so these biofilms can survive on drier surfaces. I first heard about this from Malmesbury’s excellent newsletter, called “Telescopic Turnip.”

Niko McCarty.

50,029 views • 6 months ago

A Change of Plan…🌍 A little insight into the realities of airline flying: sometimes the route you see on your flight tracker isn’t the one we originally planned. That’s because flight planning is a mix of science, safety, and flexibility. 🌐 One reason for changes is ATC flow management. Think of it like traffic lights in the sky, with thousands of aircraft moving through shared corridors, air traffic control sometimes adjusts our routes to keep the system flowing smoothly and safely. But today’s change wasn’t about traffic. It was about performance planning. Departing Delhi, our A350 was heavy with fuel and passengers, and the original routing led straight into an area of very high terrain. With a twin-engine aircraft, we always consider the “what if”: if one engine were to fail, how would the aircraft perform? Safety means ensuring we can still fly clear of terrain even under those conditions. That’s where ETOPS (Extended-range Twin-engine Operations) and drift down procedures come in. ETOPS rules let two-engine aircraft fly long oceanic and remote routes, but only with strict planning to guarantee diversion options. Drift down is the scenario where, after losing one engine, we calculate how the aircraft can descend to a level where it can safely continue flight and clear terrain. These are baked into every flight plan, and sometimes, the numbers don’t add up and they mean taking the longer way around. So today, instead of climbing northwest out of India, we turned south. The routing took us over Oman and the UAE, up the length of the Gulf, across Iraq, and back into our original track over western Turkey. That’s also where we passed one of my favourite places: the airfield named Batman 🦇. 👨‍✈️ It’s a great reminder that flying isn’t just point-to-point. Every route is carefully designed with safety, performance, and the flow of global air traffic in mind. It also means that we had a great opportunity to get some air-to-air pics of other aircraft. Will share these during the week 🙌🏻 #AvGeek #PilotLife #AirbusA350 #FlightDeckLife #ETOPS #FlightOps #AirlinePilot #AviationSafety #ProfessionalPilot #FromTheFlightDeck #FlyingTheWorld #SingleEngineDriftDown #AviationDaily #AvgeekCommunity #SkyHighViews

Scott Bateman MBE

33,180 views • 10 months ago

Copepods, could stop climate change 5 gigatons of these 1mm-sized zooplankton called COPEPODS live in all the world’s Oceans. This is equivalent to 17 million 747 jets, and if you laid the jets end to end, they would go around the planet 31 times. The copepods migrate from around 200m below the ocean surface every night to feed on plants (phytoplankton) at the surface. It is the greatest mass migration of animals on the planet, and it happens twice a day. The vertical motion of the copepods moves just about as much water as the moon and the tides. The copepods eat 30 times more carbon than humanity generates from burning fossil fuels, and about 6%, or 3 gigatons, of their dead bodies and poop end up in the world’s largest carbon bank, the Abyss. The Abyss contains 500m to 1000’s of meters thick layer of organic carbon / mineral sludge with an area greater area than dry land on the planet. Yet humanity has wiped out more than 50% of marine plankton productivity over the last 70 years due to chemical and particle pollution. We have also wiped out 50% of Arctic krill, which are just as important. and we are now even contemplating dredging the ocean floor! We would not have had climate change if we had not poisoned and destroyed most of the world’s oceans. By 2045, the destruction will be complete unless we act now to stop the inevitable annihilation of nature and life on Earth. Let’s put things into perspective, in comparison to protecting nature, carbon mitigation, windmills and electric cars are almost a joke. Copepods churn the oceans; Bioclimatic climate change: this report provides what we consider to be the most accurate mechanism for climate disruption, and it’s not(only) carbon dioxide; via Howard Dryden

Thomas Reis

23,622 views • 7 months ago

This guy built a visual scanner that reads 468 points on his face and 42 points on his hands from a regular webcam and turns them into a cloud of thousands of particles right between his palms. Inside, MediaPipe and TouchDesigner are linked: the first captures hands and face from the webcam with high accuracy, the second turns those coordinates into a live plane and feeds it into a POP system that instantly generates a swarm of particles in the shape of a head. No studio, no render farmer, no VR headset. Just a laptop, a webcam, and 1 TouchDesigner session. And traditional VJ studios keep teams of 5 people on a setup with lighting, custom hardware, and commercial plugins, while his expenses are only a TouchDesigner subscription and a regular USB camera. One laptop runs MediaPipe and TouchDesigner simultaneously, holds the camera stream at 60 FPS without drops, and in parallel processes 468 face points + 21 points on each hand. The camera captures frame after frame, MediaPipe in real time sends TouchDesigner the finger coordinates and face geometry, and the POP operator inside the engine translates those numbers into thousands of particle points with colors from bright pink to gold. This setup immediately defines the role of the tool and the limits of its autonomy. It knows where the fingertips are at every moment of the frame. It knows how to read the face geometry at any angle to the camera. It knows how to draw a swarm of particles between them with the right color and contour. → MediaPipe pulls 468 points from the face and 21 points from each hand, 60 times per second → TouchDesigner receives those coordinates, builds a virtual rectangle between the fingertips, and feeds it into the POP system → POP generates thousands of particle points in the shape of a head, coloring them in a gradient from bright pink to gold → The HUD layer adds green corners and a blue neon frame, styling the image like an AR interface → All layers assemble into 1 real-time frame that projects back onto the video in the camera window → The final image is recorded to a file or broadcast to a projector for a live installation And only when the guy spreads his hands wider does the plane between the palms stretch; brings them together, it narrows. Otherwise the system runs on its own. And when he moves from his home room to a concert hall, the same laptop with the same webcam launches the same TouchDesigner session in just 5 minutes, without reconfiguration, without a new team, and without a single line of new code. In his work setup there is no studio of his own and no team for assembly. On the desk sits a laptop with a webcam, on top run MediaPipe and TouchDesigner with POP operators, and the same setup through a USB camera moves to any concert without a new configuration. Out of everything I have seen this year, this is the cleanest Creative Coding setup on 1 laptop: 0 render farms, 0 studio lighting, and between them 3 libraries, thousands of particle points, and 1 webcam.

Blaze

38,242 views • 2 months ago

Let's go on Adventure with Seedance 2.0 🔥✨ on Higgsfield AI 🧩 Prompt: Subject: Downhill Kart Race Style: Hyper-realistic, Action Adventure, GoPro Aesthetic Action: A fast downhill race following a lead pack of kids on go-karts. They speed down a grassy slope, drifting through uneven terrain with dust and grass clippings flying. The "insane" twist: As the karts reach the edge of the valley, the lead racer pulls a hidden lever. Suddenly, the karts deploy makeshift, rocket-powered thrusters and makeshift gliders. The karts don't stop at the cliff’s edge; they launch into the air, soaring over the village below as the engines roar and blue flames erupt from the exhaust. Camera Movement: Dynamic Chase Cam. The camera moves forward rapidly, weaving between racers. As they hit the cliff edge, the camera performs a seamless transition into a dizzying free-fall perspective, tilting downward to show the massive drop before leveling out to follow the karts gliding through the air. Environment: Sunny rural landscape, vibrant greens and blues. The peaceful valley floor is now a mile below, with the village looking like a miniature model set. Details: Motion blur on the edges, intense vibration of the karts. New details: Heat haze shimmering from the rocket thrusters, lens flares as the sun hits the metallic gliders, and the visible shock on the racers' faces through their goggles as they break the sound of wind with a sudden sonic pop. Higgsfield Collaborators

Iqra Saifi

13,539 views • 2 months ago