The South China Morning Post shares an update on the status of an experimental tower in northern China, dubbed the world’s biggest air purifier by its operators. According to the scientist leading the project, the tower — which stands over 328 feet (100 meters) tall — has brought a noticeable improvement in air quality. From the report: The head of the research, Cao Junji, said improvements in air quality had been observed over an area of 10 square kilometers (3.86 square miles) in the city over the past few months and the tower has managed to produce more than 10 million cubic meters (353 million cubic feet) of clean air a day since its launch. Cao added that on severely polluted days the tower was able to reduce smog close to moderate levels. The system works through greenhouses covering about half the size of a soccer field around the base of the tower. Polluted air is sucked into the glasshouses and heated up by solar energy. The hot air then rises through the tower and passes through multiple layers of cleaning filters. The average reduction in PM2.5 — the fine particles in smog deemed most harmful to health — fell 15 per cent during heavy pollution. Cao said the results were preliminary because the experiment is still ongoing. The team plans to release more detailed data in March with a full scientific assessment of the facility’s overall performance. Read more of this story at Slashdot.
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China Builds ‘World’s Biggest Air Purifier’ That Actually Works
Engineers have figured out how to make antennas for wireless communication 100 times smaller than their current size, an advance that could lead to tiny brain implants, micro-medical devices, or phones you can wear on your finger. Science Magazine reports: The new mini-antennas play off the difference between electromagnetic (EM) waves, such as light and radio waves, and acoustic waves, such as sound and inaudible vibrations. EM waves are fluctuations in an electromagnetic field, and they travel at light speed — an astounding 300, 000, 000 meters per second. Acoustic waves are the jiggling of matter, and they travel at the much slower speed of sound — in a solid, typically a few thousand meters per second. So, at any given frequency, an EM wave has a much longer wavelength than an acoustic wave. Antennas receive information by resonating with EM waves, which they convert into electrical voltage. For such resonance to occur, a traditional antenna’s length must roughly match the wavelength of the EM wave it receives, meaning that the antenna must be relatively big. However, like a guitar string, an antenna can also resonate with acoustic waves. The new antennas take advantage of this fact. They will pick up EM waves of a given frequency if its size matches the wavelength of the much shorter acoustic waves of the same frequency. That means that that for any given signal frequency, the antennas can be much smaller. The trick is, of course, to quickly turn the incoming EM waves into acoustic waves. The team created two kinds of acoustic antennas. One has a circular membrane, which works for frequencies in the gigahertz range, including those for WiFi. The other has a rectangular membrane, suitable for megahertz frequencies used for TV and radio. Each is less than a millimeter across, and both can be manufactured together on a single chip. When researchers tested one of the antennas in a specially insulated room, they found that compared to a conventional ring antenna of the same size, it sent and received 2.5 gigahertz signals about 100, 000 times more efficiently, they report in Nature Communications. Read more of this story at Slashdot. 
After being switched on for the first time last Friday, the UK’s newest fusion reactor has successfully generated a molten mass of electrically-charged gas, or plasma, inside its core. Futurism reports: Called the ST40, the reactor was constructed by Tokamak Energy, one of the leading private fusion energy companies in the world. The company was founded in 2009 with the express purpose of designing and developing small fusion reactors to introduce fusion power into the grid by 2030. Now that the ST40 is running, the company will commission and install the complete set of magnetic coils needed to reach fusion temperatures. The ST40 should be creating a plasma temperature as hot as the center of the Sun — 15 million degrees Celsius (27 million degrees Fahrenheit) — by Autumn 2017. By 2018, the ST40 will produce plasma temperatures of 100 million degrees Celsius (180 million degrees Fahrenheit), another record-breaker for a privately owned and funded fusion reactor. That temperature threshold is important, as it is the minimum temperature for inducing the controlled fusion reaction. Assuming the ST40 succeeds, it will prove that its novel design can produce commercially viable fusion power. Read more of this story at Slashdot. 
tomhath writes: Once the fastest ocean liner ever built, the SS United States has been mothballed for almost 50 years. An ambitious project to refurbish the SS United States as a luxury liner has been abandoned due to insurmountable technical and commercial obstacles. Plan B, to turn it into a floating hotel/convention center, might go forward. Miami Herald provides some history of the SS United States in its report: “The iconic 1950s vessel, which was bigger than the Titanic and once carried celebrities across the Atlantic Ocean, was set for a $700 million overhaul by the Los Angeles-based luxury line, which also has offices in Miami. The SS United States was decommissioned in 1969 and has been gutted and docked in Philadelphia for two decades on the Delaware River. On its maiden voyage in 1952, the ship traversed the Atlantic in three days, 10 hours and 42 minutes — a record it held until 1990.” Read more of this story at Slashdot.