Science desk | ||
---|---|---|
< January 23 | << Dec | January | Feb >> | Current desk > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
What's the procedure for firing up (from cold and dark) a steam train fitted with a mechanical stoker (in particular, the Russian P36 engine)? How is it different from firing up a hand-stoked engine? 2601:646:8A00:A0B3:C513:DCE6:D87B:6555 ( talk) 03:27, 24 January 2019 (UTC)
I have been watching youtube videos about seagulls recently and it seems to me that in coastal areas in most parts of the world, there are to be found at least one local species of gull that fits the 'standard basic large seagull' description. Chicken sized, white body and head, wings that are various shades of gray/black, yellow beak, communictes with squawks and squeals, has a trumpeting territorrial call, etc. A bunch of them look like palette swaps. Considering their global distibution I was wondering if they evolved from their shared ancestor fairly recently and then spread across the globe quickly, as they don't seem to have changed much in appearance in various locations. This may also be the case with the small hooded gulls (the other common 'design') but I didn't look at them that closely. Thanks. — Preceding unsigned comment added by 146.200.128.175 ( talk) 11:02, 24 January 2019 (UTC)
Nil Einne ( talk) 11:32, 24 January 2019 (UTC)The taxonomy of gulls is confused by their widespread distribution zones of hybridization leading to geneflow. Some have traditionally been considered ring species, but recent evidence suggests that this assumption is questionable.[22] <snipped> Some English names refer to species complexes within the group:
Large white-headed gull is used to describe the 18 or so herring gull-like species from California gull to lesser black-backed gull
<Snipped> Hybridisation between species of gull occurs quite frequently, although to varying degrees depending on the species involved. The taxonomy of the large white-headed gulls is particularly complicated.
magnetic moment is product of pole strength and magnetic length.atom is a magnetic dipole of magnetic moment equal to product of electric current and area of current loop.if magnetic length is less than 1.4 fm then resulting moment is of di or monopole? — Preceding unsigned comment added by 42.110.136.86 ( talk) 15:20, 24 January 2019 (UTC)
This article, based on this paper describes the case of quasiparticles which can be separated from dipoles into monopoles. While these aren't real monopoles, it seems like the math can accommodate shifting from one to the other somehow. I mean, how do we know that all our real particles aren't quasiparticles in some other system beyond at least my comprehension, though perhaps known to some bright physics professionals out there? Wnt ( talk) 19:26, 29 January 2019 (UTC)
What financial gain can be obtained from household garbage? Without the gov forcing it to be profitable, either by subsidies or regulation, without causing some collateral damage, like burning some toxic material and without cheating (like starting with a pile of already sorted plastic). Can something be mined from a pile of random garbage? -- Doroletho ( talk) 17:49, 24 January 2019 (UTC)
Science desk | ||
---|---|---|
< January 23 | << Dec | January | Feb >> | Current desk > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
What's the procedure for firing up (from cold and dark) a steam train fitted with a mechanical stoker (in particular, the Russian P36 engine)? How is it different from firing up a hand-stoked engine? 2601:646:8A00:A0B3:C513:DCE6:D87B:6555 ( talk) 03:27, 24 January 2019 (UTC)
I have been watching youtube videos about seagulls recently and it seems to me that in coastal areas in most parts of the world, there are to be found at least one local species of gull that fits the 'standard basic large seagull' description. Chicken sized, white body and head, wings that are various shades of gray/black, yellow beak, communictes with squawks and squeals, has a trumpeting territorrial call, etc. A bunch of them look like palette swaps. Considering their global distibution I was wondering if they evolved from their shared ancestor fairly recently and then spread across the globe quickly, as they don't seem to have changed much in appearance in various locations. This may also be the case with the small hooded gulls (the other common 'design') but I didn't look at them that closely. Thanks. — Preceding unsigned comment added by 146.200.128.175 ( talk) 11:02, 24 January 2019 (UTC)
Nil Einne ( talk) 11:32, 24 January 2019 (UTC)The taxonomy of gulls is confused by their widespread distribution zones of hybridization leading to geneflow. Some have traditionally been considered ring species, but recent evidence suggests that this assumption is questionable.[22] <snipped> Some English names refer to species complexes within the group:
Large white-headed gull is used to describe the 18 or so herring gull-like species from California gull to lesser black-backed gull
<Snipped> Hybridisation between species of gull occurs quite frequently, although to varying degrees depending on the species involved. The taxonomy of the large white-headed gulls is particularly complicated.
magnetic moment is product of pole strength and magnetic length.atom is a magnetic dipole of magnetic moment equal to product of electric current and area of current loop.if magnetic length is less than 1.4 fm then resulting moment is of di or monopole? — Preceding unsigned comment added by 42.110.136.86 ( talk) 15:20, 24 January 2019 (UTC)
This article, based on this paper describes the case of quasiparticles which can be separated from dipoles into monopoles. While these aren't real monopoles, it seems like the math can accommodate shifting from one to the other somehow. I mean, how do we know that all our real particles aren't quasiparticles in some other system beyond at least my comprehension, though perhaps known to some bright physics professionals out there? Wnt ( talk) 19:26, 29 January 2019 (UTC)
What financial gain can be obtained from household garbage? Without the gov forcing it to be profitable, either by subsidies or regulation, without causing some collateral damage, like burning some toxic material and without cheating (like starting with a pile of already sorted plastic). Can something be mined from a pile of random garbage? -- Doroletho ( talk) 17:49, 24 January 2019 (UTC)