Category: transportation – Page 211
In the pre-industrial age, people only needed to measure years and months to a fair amount of accuracy. The position of the sun in the sky was good enough to break up the day. Timing at the level of fractions of a second was simply not needed.
Eventually, modern industry arose. Fast-moving machines came to dominate human activity, and clocks required hands that could measure seconds. In the current era of digital technology, the timing of electronic circuitry means that millionths or billionths of a second actually matter. None of the high-tech stuff we need, from our phones to our cars, can be controlled or manipulated if we cannot keep close track of it. To make technology work, we need clocks that are faster than the timing of the machines we need to control. For today’s technology, that means we must be able to measure seconds, milliseconds, or even nanoseconds with astonishing accuracy.
Every timekeeping device works via a version of a pendulum. Something must swing back and forth to beat out a basic unit of time. Mechanical clocks used gears and springs. But metal changes shape as it heats or cools, and friction wears down mechanical parts. All of this limits the accuracy of these timekeeping machines. As the speed of human culture climbed higher, it demanded a kind of hyper-fast pendulum that would never wear down.
Wow!
Posted in transportation
The Ingenuity helicopter flew over the leftovers of Perseverance’s backshell and parachute and it looks soooo cool!
Source: https://twitter.com/NASAJPL/status/1519401118152888321
If you look at Amtrak’s route map, you’ll notice that the service isn’t really geared toward serving rural areas and smaller cities. Sure, they do stop at some smaller cities along existing rail routes, but those aren’t the point as much as a place to get fuel and let people get onto connecting services. On top of that issue, Amtrak largely uses the same tracks as freight trains, and the freight lines have been placed according to freight needs and not the needs of potential passengers. In one particularly weird case, it completely skips the Phoenix metro area, with the nearest station in Maricopa.
But I’m getting off topic a bit with that last one. The main point to gather from the map is that it’s designed mostly to connect larger cities with other large cities. Going from New York to Los Angeles isn’t a big deal. Going from El Paso to Albuquerque, well, even Amtrak tells you on the map that you’re getting on a Greyhound. Public transit really isn’t a priority in the United States, though. So maybe this isn’t a fair comparison. Let’s look at some maps in other countries for a minute:
Money manager Invesco on Wednesday launched an exchange-traded fund aimed at providing exposure to industrial metals needed to make electric vehicles, as commodity prices have surged and the market for EVs continues to expand.
The Invesco Electric Vehicle Metals Commodity Strategy No K-1 ETF began trading Wednesday under the EVMT ticker and is the first of its kind, with the non-equity fund offering investors access to key metals needed by all EV manufacturers, the company said in a press statement.
EVMT will invest in derivatives and other instruments financially linked to exposure to aluminum, cobalt, copper, iron ore, nickel, and zinc. EVMT is the “only ETF that considers metals necessary for whole car production, rather than a focus on battery production,” said Jason Bloom, head of fixed income and alternatives ETF strategy at Invesco, in the statement.
Cooper Bikes, the company behind the Mini Cooper car, has just unveiled four new electric bicycle models that comprise the brand’s second generation e-bikes.
Cooper Bikes is the two-wheeler division of Cooper Car Company, which was the original designer of the Mini Cooper, itself a segment of BMC’s iconic Mini.
But while the Mini Cooper helped create a name for the company as far back as 1961, today it is Cooper Bikes that is stealing the headlines with four interesting new models.
Despite nearly a decade of effort, no one has been able to design a working prototype.
North Virginia will make multi-billion dollar decisions this year on the region’s transportation future—decisions that are only going to induce more driving.
BHL Cryotanks have demonstrated a 75% mass reduction compared to existing state-of-the-art aerospace cryotanks (metal or composite), enabling hydrogen aircraft and eVTOL makers to store as much as 10 times more liquid hydrogen fuel without adding mass. As a result, aircraft can travel longer distances without refueling.
GTL has fabricated and tested multiple BHL Cryotanks at a range of scales and has been demonstrated to be leak-tight even after repeated cryo-thermal pressure cycles. This technology has achieved TRL 5+ and is compatible with a variety of cryogenic propellants, including liquid oxygen, liquid methane, and liquid hydrogen.
The BHL Cryotank pictured here measures 2.4 meters long with a 1.2-meter diameter and weighs 12 kilograms (roughly 26 pounds). With the addition of a skirt and vacuum dewar shell, the total system weight is 67 kilograms. This particular tank system can hold over 150 kilograms of liquid hydrogen, giving it a hydrogen storage ratio of at least 50% (the weight of stored hydrogen fuel relative to total system weight), which is as much as 10 times greater than current state-of-the-art fuel tanks. HyPoint estimated that an aircraft equipped with GTL dewar tank technology could achieve as much as four times the range of a conventional aircraft using aviation fuel, cutting aircraft operating costs by an estimated 50% on a dollar-per-passenger-mile basis.