Category Archives: Technology

Environment, Science, Technology, United States

Ammonia is being developed as a low-carbon fuel

ENVIRONMENT

Intro: A start-up in America is developing world’s first ammonia-powered ships

THE Brooklyn Navy Yard’s sprawling industrial complex once employed 70,000 workers to build US battleships and aircraft carriers during the second world war. Almost 80 years later, it has become home to a New York city firm with a very different maritime mission – harnessing ammonia as a low-carbon fuel for the global shipping industry.

The start-up Amogy has already shown how ammonia-powered technology can work in a flying drone, a John Deere tractor and most recently a truck. Now, it is working on an ammonia-powered ship.

Most ships currently run on fossil fuels that emit greenhouse gases, accounting for 3 per cent of the world’s carbon emissions. One alternative involves converting vehicles to hydrogen power that would only emit water. But hydrogen gas needs to be compressed and liquified at -253°C for storage and transportation.

Ammonia could serve as an alternative hydrogen-bearing fuel that is more easily stored and transported in a stable liquid form at room temperature.

Hydrogen can be extracted by heating ammonia to high temperatures, which is a process that comes with its own energy cost. This is where Amogy’s technology comes in. To make ammonia power more viable, the company has developed what it describes as a more efficient and miniaturised “ammonia cracking” method that can chemically extract hydrogen from ammonia at a lower temperature. It uses a proprietary catalyst to speed up the process inside a chemical reactor that feeds into a hydrogen fuel cell.

A leading chemist at Saint Mary’s College of California says that what Amogy was able to bring to the table is that by having better catalytic technologies (all proprietary) they were able to miniaturise their ammonia cracking units and put them on board vehicles.

It was in July 2021 when Amogy first showed that its system could supply 5 kilowatts of power to a drone. By comparison, a standard ammonia cracking system for extracting that amount of hydrogen power is usually the size of a large shipping container. It also paved the way for a 100-kilowatt tractor demonstration in May 2022. That was followed by a 300-kilowatt truck demonstration in January 2023. The firm is now working towards demonstrating a 1-megawatt system in a tugboat.

Many countries already have pipelines and port facilities for handling ammonia that is produced industrially as fertiliser for agriculture. The US alone has more than 5000 kilometres of ammonia pipelines compared with 2500 kilometres of pipeline for transporting hydrogen – though it will need more to support ammonia-powered vehicles.

Another challenge is that ammonia still “has a carbon footprint associated with the production” because the standard industrial process uses natural gas. Low-carbon ammonia production would require use of carbon capture.

Cleaner alternative methods could ideally use electricity from renewable power sources to split water into hydrogen for conversion to ammonia.

. Science Book: Chemistry

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Britain, Defence, Government, National Security, Society, Technology, United States

Menacing spies in the sky

NATIONAL SECURITY

ABOVE our heads – some 80,000 feet up – a high-tech tussle is under way, with our most closely guarded secrets and our national security at stake. The shooting down of a number of intelligence balloons in recent days seems closer to a fictional tale rather than the serious threat they pose.

Four mysterious aircraft have been shot down in just nine days over North America, three by the US Air Force and one by the Royal Canadian Air Force.

The fictional perspective was primed when an American general sparked a storm of speculation when he said that he was not excluding extra-terrestrial origin for these intruders. General Glen VanHerck, commander of North American Aerospace Defence Command, when asked about the possibility of aliens, said: “I haven’t ruled out anything at this point.”

For these are – quite literally – unidentified flying objects. The language used to describe them recalls the unexplained sightings that, for decades, have puzzled even seasoned observers. UFO enthusiasts are enthralled. In 2021, the Pentagon set up the Airborne Object Identification and Management Synchronisation Group to investigate more than 100 incidents.

One of the aircraft, downed last week over Alaska, was described as “cylindrical and silverish gray”, about the “size of a small car” and with “no identifiable propulsion system”. Another, brought to earth on the US-Canadian border, was a “small, cylindrical object”.

Such intruders may also have crossed British territory. Rishi Sunak, newly enthused by military matters, says we can and will shoot them down if necessary.

Defence Secretary Ben Wallace has ordered a review. For now, the questions are multiplying. Are they Chinese? The West seems to think so. The regime in Beijing has protested about the downing of two of them – just peaceful weather balloons, it insists.

Security officials in the West say that China’s stratospheric surveillance programme has operated for many years, and over five continents. It is the brainchild of the Strategic Support Force, a secretive component of the People’s Liberation Army. So, why now? Why have we not noticed this before?

The short and probable answer is that we weren’t looking. These balloons and drones move incredibly slowly at great heights. Our air-defence radar works at lower altitudes. Our missile defence-systems track fast-moving rockets. US officials are now scouring data collected in previous years for signs of intrusions that they may have missed. So far, the Pentagon says, four previous instances have been identified.

In any case, malevolent intruders can easily be missed amid the thousand of innocent weather balloons launched every day. Gathering meteorological data provides perfect cover for covert missions. China counteracts claiming that the US has repeatedly sent spy balloons into Chinese airspace. The Americans deny this.

THREATENING

THE question looms as to why China would invest so much in these missions when it has more than 260 spy satellites? Being only 15 miles above the earth’s surface – satellites are seven times higher – gives them a clear edge in taking photographs and hoovering up electronic information, such as the ultra-sensitive “friend-or-foe” systems that prevent us shooting down our own warplanes.

These satellites can loiter over sensitive military installations, such as the RAF base at Boscombe Down in Wiltshire, used by American spy planes. Gathering information about the temperature and density of the air at high altitudes could also give a crucial advantage to missile-guidance systems. These spycraft may also be sent to test national defences.

Most worryingly, China published in 2018 a video showing a balloon being used as a platform to launch hypersonic weapons. These can travel vast distances at high speed, evading our defences and delivering either nuclear warheads, or electromagnetic pulse blasts that devastate all electrical and electronic devices.

What keeps these machines aloft and on course, thousands of miles from home, nothing is said.

Some clues, however, may come from here in Britain. We have Stratospheric Platforms, a company that offers internet access from a drone that can stay in the atmosphere for a week at a time, powered by a hydrogen engine. Another British start-up, Avealto, has a solar-powered craft in orbit that targets the same market.

Speculation abounds about even more advanced technologies. Aviation experts are eagerly awaiting news from the wreckage of the recent devices shot down.

Could, for example, the Chinese have cracked the difficulties of “ion propulsion”, which uses blasts of electrically charged air to stay aloft, and requires no combustion or moving parts like propellers or jets?

Prototypes of aircraft using this technology already fly, but they use too much electricity to be viable. Or so we think.

Whatever the case, the wreckage recovered from the recent incidents’ will be eagerly inspected by American military technologists hoping to gain an edge in the battle against spy wars in the sky. The results of their investigations will be classified secret. Why give clues to the enemy?

One thing in this extraordinary story is clear. These balloons are far from innocent and have caught the guardians of our security napping. Vigilance has been poor.

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Climate Change, Government, Science, Technology, United States

Nuclear fusion: A breakthrough that will lead to clean energy?

NUCLEAR FUSION

A REVOLUTIONARY scientific breakthrough is thought to have brought humanity a step closer towards limitless clean energy from nuclear fusion.

Since the 1950s, scientists and researchers have been working tirelessly towards the “holy grail” of creating more energy from nuclear fusion than they put in.

Now US government scientists in California have reportedly done it, by aiming the world’s largest laser at a nuclear target the size of a peppercorn.

The result, from a nuclear reaction reaching three million degrees Celsius, is apparently 2.5 megajoules of energy, from 2.1 megajoules of laser energy.

Nuclear fusion is preferable to nuclear fission, which is currently used to power the planet alongside fossil fuels and renewable power.

That is because nuclear fission splits heavy atoms like uranium or plutonium, to create energy, producing potentially dangerous radioactive waste that must be stored.

Nuclear fusion creates energy by bringing atoms together, instead of splitting them, and has no waste products, making it clean energy.

Unlike coal, the supply is limitless, usually requiring just two materials called deuterium and tritium, which are slightly different versions of hydrogen and found in sea water and mineral springs.

A small cup of this fuel could one day be used to power a house for hundreds of years.

The breakthrough at the federal Lawrence Livermore Laboratory in California was achieved using a laser pulse amplified a quadrillion (a million billion) times and split into 192 different pulses.

These enter a hohlraum – a gold container – and hit a tiny capsule of deuterium and tritium, creating shockwaves which produce vast amounts of  energy, in a process called inertial confinement fusion.

Significant engineering challenges remain, including how to cut the cost of nuclear fusion, harness the energy produced, run it through a turbine and get it into the National Grid.

Most experts believe this won’t be possible until 2045, but some say it could be done in a decade and is likely to be achieved using a different type of nuclear fusion called magnetic fusion.

But whether it is using magnets or lasers, the experts agree it is the main hope for escaping the climate crisis.

Sir Robin Grimes, professor of material physics at Imperial College London, said: “This is a key step towards commercial fusion – the technology which will ensure our survival on Earth, providing enough energy, with a low impact on the environment, to hugely reduce our contribution to climate change.”

Jeremy Chittenden, professor of plasma physics at Imperial, said: “If what has been reported is true and more energy has been released than was used to produce the plasma, that is a true breakthrough moment.”

Nuclear fusion, if it can be scaled up and made to run more continuously, could in future be almost zero-carbon.

However, some experts point out that the amount of energy used for the entire system containing the laser means, technically, scientists are unlikely to have yet produced more energy from nuclear fusion than was put into it.

The US energy secretary, Jennifer Granholm, made the announcement of a “major scientific breakthrough”.

– Diagrammatic representation of how nuclear fusion works. Source: BBC

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