| golden handcuffs by Celia Warren (Limerick #109365) | The boss grabbed me, not quite by the sleeve;
Said, "You know we don't want you to leave."
In his voice, loud and posh,
He discussed deferred dosh:
Golden handcuffs. I'm not that naive. | dosh: (British informal) money |
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| grafter by Celia Warren (Limerick #109364) | Our Gary works hard — he's a grafter.
Job's demanding, although filled with laughter:
Comic-acting each day
And each night in some play.
He won't stop, even in the hereafter. | grafter: (British informal) one who works hard |
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| Bastos, Dário by John Critten (Limerick #109363) | The poetry here perforce terse is.
A poet of empty words worse is,
With no feeling, no heart,
Nor humanity's part.
—It's not nearly enough to write verses! | This is based on some of the themes in the poem "Ser Poeta" by Portuguese poet Dário Bastos (1903–2001), in which he outlines that without the elements of emotion, humanity and sensitivity, poetry is merely empty words. To quote the first and final lines: "Ser poeta ... —Não basta fazer versos!" (To be a poet ... —It is not enough to write verses!) |
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| aerobraking, aerocapture, atmospheric drag by GalFisk (Limerick #109361) | A Mars orbit's a huge undertaking.
Atmospheric drag, that's what we're staking
On: the gas of the globe
Helps to slow down our probe.
Aerobraking (hope not aerobreaking). | Aerobraking (or the more violent aerocapture) can be used to slow down from a flyby trajectory, and enter into orbit around a planet or moon with an atmosphere. Aerobraking uses several passes through the upper atmosphere to gradually reshape the orbit, while aerocapture uses a single, lower pass to bleed off a lot of speed in one go. The latter maneuver requires a heat shield. Objects in low Earth orbit, including the International Space Station, also need to periodically raise their orbits with rockets due to faint atmospheric drag. |
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| go-around by GalFisk (Limerick #109360) | There's an issue on final approach,
As some birds on the airstrip encroach.
My face, it turns violet —
"Make a go-around, pilot!"
I yell from seat 9D in coach. | A go-around is flown in order to make a new attempt at landing, if the current attempt is aborted. |
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| convergent-divergent nozzle, con-di nozzle, CD nozzle, de Laval nozzle by GalFisk (Limerick #109359) | It's convergent-divergent, this nozzle
De Laval is inventing. His cause'll
Be making choked flow
Of hot steam, which will go
Supersonic, like rockets, fo' shozzle! | The CD nozzle was first invented for driving steam turbines, but it also turned out to be perfect for rocket engines. The convergent section forces a flowing gas to compress and speed up. When the gas reaches its own speed of sound (which rises with rising pressure and temperature), a choked flow is produced. The divergent section then allows the gas to expand, trading pressure and temperature for even more speed. The gas exits the nozzle with relatively low pressure but supersonic velocity. |
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| ground loop, earth loop by GalFisk (Limerick #109357) | "A ground loop? Avoid it you must!
The electrical currents need just
One clear path to the ground;
When you looped it around,
You induced this damn buzzing!" he cussed. | Ground loops are a major cause of noise, hum, and interference in audio, video, and computer systems. They're most often formed unintentionally when connecting several pieces of equipment together. |
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| ammonium perchlorate, AP by GalFisk (Limerick #109356) | The ammonium ion is there,
With a bond to perchlorate, but tear
Them apart, and they're free —
Then an oxygen spree
Can contribute to rockets' red glare. | Ammonium perchlorate is a powerful oxidizer used in rockets of all sizes, including solid rocket boosters for space launches. It's also used in some colored fireworks. It decomposes when heated and can explode violently in the right conditions. The 1988 PEPCON disaster was a fire that caused a series of powerful explosions in the Pacific Engineering and Production Company of Nevada perchlorate plant, which supplied civilian and military rocket manufacturers. |
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| ground plane by GalFisk (Limerick #109355) | When designing a circuit for print,
Make a ground plane. I'll give you a hint:
Interference you'll beat
With a big copper sheet,
And the layout's a cinch. Make a mint! | The transmission antennae need, too,
Other ground planes, created by you.
For the long-wave, the girth
Must be huge (use the Earth).
For the UHF, mesh screen will do.
In printed circuit board design, the ground plane is a layer of copper covering most of the board, which prevents interference and makes grounding components simple. In antenna design, a ground plane acts to reflect the radio waves and make the antenna directional. It needs to be conductive and mostly flat, and at least a quarter of the wavelength in diameter. |
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