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Category: transportation – Page 446

Boston University researchers, Xin Zhang, a professor at the College of Engineering, and Reza Ghaffarivardavagh, a Ph.D. student in the Department of Mechanical Engineering, released a paper in Physical Review B demonstrating it’s possible to silence noise using an open, ringlike structure, created to mathematically perfect specifications, for cutting out sounds while maintaining airflow.

“Today’s barriers are literally thick heavy walls,” says Ghaffarivardavagh. Although noise-mitigating barricades, called sound baffles, can help drown out the whoosh of rush hour traffic or contain the symphony of music within concert hall walls, they are a clunky approach not well suited to situations where airflow is also critical. Imagine barricading a jet engine’s exhaust vent—the plane would never leave the ground. Instead, workers on the tarmac wear earplugs to protect their hearing from the deafening roar.

Ghaffarivardavagh and Zhang let mathematics—a shared passion that has buoyed both of their engineering careers and made them well-suited research partners—guide them toward a workable design for what the acoustic metamaterial would look like.

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Japan, March 12, 2019—The Japan Aerospace Exploration Agency (JAXA) and Toyota Motor Corporation (Toyota) agreed today to study the possibility of collaborating on international space exploration. As a first step, JAXA and Toyota agreed to further cooperate on and accelerate their ongoing joint study*1 of a manned, pressurized rover*2 that employs fuel cell vehicle technologies. Such a form of mobility is deemed necessary for human exploration activities on the lunar surface. Even with the limited amount of energy that can be transported to the moon, the pressurized rover would have a total lunar-surface cruising range of more than 10,000 km.

International space exploration, aiming to achieve sustainable prosperity for all of humankind by expanding the domain of human activity and giving rise to intellectual properties, has its sights set on the moon and Mars. To achieve the goals of such exploration, coordination between unmanned missions, such as the recent successful touchdown by the asteroid probe Hayabusa2 on the asteroid Ryugu, and manned missions, such as those involving humans using pressurized rovers to conduct activities on the moon, is essential. When it comes to challenging missions such as lunar or Martian exploration, while various countries are competing in advancing their technologies, they are also advancing their cooperative efforts.

JAXA President Hiroshi Yamakawa had this to say today about the agreement between JAXA and Toyota: “At JAXA, we are pursuing international coordination and technological studies toward Japan’s participation in international space exploration. We aim to contribute through leading Japanese technologies that can potentially generate spin-off benefits. Having Toyota join us in the challenge of international space exploration greatly strengthens our confidence. Manned rovers with pressurized cabins are an element that will play an important role in full-fledged exploration and use of the lunar surface. For this, we would like to concentrate our country’s technological abilities and conduct technological studies. Through our joint studies going forward, we would like to put to use Toyota’s excellent technological abilities related to mobility, and we look forward to the acceleration of our technological studies for the realization of a manned, pressurized rover.”

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So far, no one has commercialized nuclear fusion, but the race is on to be the first to figure it out. Whoever does will be able to bring power to the more than 1 billion who don’t have access to electricity, power cars and help companies operate businesses without having to create harmful emissions.

Jeff Bezos and others have sunk more than $127 million into General Fusion, a start-up trying to commercialize fusion energy. Microsoft is partnering with the company. The goal: to provide energy to 1 billion people that don’t have electricity.

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In the wake of the October 29 Indonesian crash of a brand new Boeing 737 MAX 8 that took the lives of 189 passengers, the FAA has issued Emergency Airworthiness Directive (AD) 2018−23−51. The 737 is the most widely flown aircraft in the world, This tragedy opens an important conversation between regulators, operators and pilots.

Lion Air, an experienced 737 operator, was the launch carrier last year for the 737 MAX 8 and the MAX 9 in March. While it will take a long time to analyze the Lion Air 610 accident, the AD points out that current system architecture has created vulnerabilities.

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Already, 1,000 smart city pilots are under construction or in their final urban planning stages across the globe, driving forward countless visions of the future.

As data becomes the gold of the 21st century, centralized databases and hyper-connected infrastructures will enable everything from sentient cities that respond to data inputs in real time to smart public services that revolutionize modern governance.

Connecting countless industries—real estate, energy, sensors and networks, and transportation, among others—tomorrow’s cities pose no end of creative possibilities and stand to completely transform the human experience.

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An air-to-air imaging technology developed by NASA has resulted in the first images ever taken of interacting shockwaves produced by in-flight supersonic jets. The new images, in addition to being beautiful, will help NASA design jets capable of producing gentle rumbles instead of loud sonic booms when breaking the sound barrier.

The project, called AirBOS, or Air-to-Air Background Oriented Schlieren flights, recently took place at NASA’s Armstrong Flight Research Center in Edwards, California, reports NASA in a press release. A new imaging system used during the test is now the first to capture high-quality images of interacting shockwaves produced by two different aircraft.

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