Recent content by Carrock

There is one exception: standard frequency transmitters where the aim is to minimise the noise i.e. frequency drift. The only one I know anything much about is MSF, which has been transmitting at 60 kHz for decades, complete with a once state of the art 1 bit/s modulation giving the date and...

I am impressed by your logic and skill in this devastating refutation of everything I said. I shall of course recuse myself from this thread. Congratulations on your win.

A quick edit as my browser crashed during my first attempt..... You need to justify claiming that an apparently cost effective solution will not be useful in the future. From https://www.vox.com/2016/4/28/11524958/energy-storage-rail "And rail storage is faster, with lower capital costs, than...

From https://aresnorthamerica.com/gravityline/ "GravityLineTM systems can be sited in a wide variety of locations due to an ability to operate effectively on elevation differentials as low as 200 feet." Possibly the facility I mentioned in my first post was actually 1 GWh, but it is still...

https://www.ediweekly.com/energy-storage-uses-rail-cars-gravity-to-mimic-benefits-of-hydro/ https://aresnorthamerica.com/gravityline/ https://aresnorthamerica.com/las-vegas-business-press-deal-watch-ares-nevada-builds-energy-storage-facility-in-pahrump/

There's also rail-based gravity storage, with at least one facility in Nevada being built, with an 'artist's impression' suggesting it stores about 0.5GWh, with plans for 16–24GWh capacity. It can ramp up power output faster than gas, but slower than hydroelectric. A pilot project using an...

Perhaps they should have gone for William Morris' adult and much less prolix The Well at the World's End. Prince Ralph goes on a quest on his horse Shadowfax to find the Well, which confers renewed youth but not immortality, heals all wounds and provides heart's ease, the only thing he needs...

I haven't seen "Destination Moon" (1950) in a long time but I think the science was pretty accurate. R. A. Heinlein was a writer and technical adviser on the film. He wrote "The man who sold the moon" around the same time and I can't think of any other pre Apollo SF that described fairly...

Um, have you read the post you quoted from? ( https://www.physicsforums.com/threads/photon-states-should-not-evolve.925675/page-4#post-5847397 ) Carrock: Saying that 'the concept of "time" does not apply to them' also often leads to incorrect inferences. PeterDonis: How So? Carrock: Hard to...

Hard to find a reference, but I've seen claims that photons experience change in some way, but time does not pass for them. It's usually harder to understand when time is implicitly avoided but a vaguely similar concept is used. Often isn't necessarily. There's no problem e.g. in moving a clock...

'Saying that the concept of "time" does not apply to them' also often leads to incorrect inferences; I subjectively find the latter more annoying. I was simply trying to indicate that it's never necessary to have photons' energy, momentum etc change. It's often useful to think the photon is...

The general view, I think, is that time isn't an applicable concept for a photon, since a reference frame 'moving with' a photon isn't possible. To go from this to saying that photons are timeless (i.e. without defined time) is OK IMO. Whether or not their 'time' 'stands still' is semantics...

I'm wondering if you want the LED power or (LED + dropping resistor) power. I plugged some values into https://www.vishay.com/resistors/pulse-energy-calculator/ Pulse width 0.04 sec Voltage 2V Current 0.005A and got Pulse Energy = 0.4mJ Then cycle time = 2S gave 0.2mW I'm guessing you had a...

Seems like ~9W during the pulse - very high for one LED. You need to give the voltage drop across the LED, and whether the voltage during each pulse varies for a useful answer. Also I presume you want the energy used during the ten hours.

There do seem to be some elements where electron capture and presumably electric fields are significant. "Around the elements in the middle of the periodic table, isotopes that are lighter than stable isotopes of the same element tend to decay through electron capture, while isotopes heavier...