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%ما هو (من)٪ 1 - تعريف
A Charge to Keep
A Charge to Keep is a 1999 book written by then-Governor of Texas George W. Bush, with a foreword by Karen Hughes.
specific charge
![Beam of electrons moving in a circle in a [[Teltron tube]], due to the presence of a [[magnetic field]]. Purple light is emitted along the electron path, due to the electrons colliding with gas molecules in the bulb. Mass-to-charge ratio of the electron can be measured in this apparatus by comparing the radius of the purple circle, the strength of the magnetic field, and the voltage on the electron gun. The mass and charge ''cannot'' be ''separately'' measured this way—only their ratio.](https://commons.wikimedia.org/wiki/Special:FilePath/Cyclotron motion.jpg?width=200 "Beam of electrons moving in a circle in a [[Teltron tube]], due to the presence of a [[magnetic field]]. Purple light is emitted along the electron path, due to the electrons colliding with gas molecules in the bulb. Mass-to-charge ratio of the electron can be measured in this apparatus by comparing the radius of the purple circle, the strength of the magnetic field, and the voltage on the electron gun. The mass and charge ''cannot'' be ''separately'' measured this way—only their ratio.")
PHYSICAL QUANTITY OF INTEREST IN CHEMISTRY AND ELECTRODYNAMICS
Charge-to-mass ratio; M/q; M/z; Mass to charge ratio; Charge to mass ratio; Dunnington's Method; Mass-to-charge ratios; Specific charge; Mass-charge ratio; Q/m
¦ noun Physics the ratio of the charge of an ion or subatomic particle to its mass.
keep
![Reconstructed wooden keep at [[Saint-Sylvain-d'Anjou]]](https://commons.wikimedia.org/wiki/Special:FilePath/Donjon chateau a motte saint sylvain.jpg?width=200 "Reconstructed wooden keep at [[Saint-Sylvain-d'Anjou]]")
![A 19th-century reconstruction of the keep at [[Château d'Étampes]]](https://commons.wikimedia.org/wiki/Special:FilePath/Etampes Donjon - enhanced.png?width=200 "A 19th-century reconstruction of the keep at [[Château d'Étampes]]")
![colony]] of [[Bermuda]], with its Keep at the northern (right) end](https://commons.wikimedia.org/wiki/Special:FilePath/Royal Naval Dockyard Bermuda circa 1899 Ordnance Survey map by Lieutenant Arthur Johnson Savage, RE.jpg?width=200 "colony]] of [[Bermuda]], with its Keep at the northern (right) end")
TYPE OF FORTIFIED TOWER BUILT WITHIN CASTLES DURING THE MIDDLE AGES BY EUROPEAN NOBILITY
Donjon; Keeps; Keep (architecture); Keep (tower); Keep (castle); Castle keep
I
n.
maintenance
to earn one's keep
II
v.
1) (D; tr.) ('to have') to keep about (esp. BE), around (do you keep a screwdriver around the house?)
2) (d; intr.) to keep after ('to keep persuading') (keep after the children; they are still too untidy)
3) (d; tr.) to keep at ('to hold') (she kept them at their studies)
4) (d; tr.) ('to hold') to keep for (the librarian will keep the book for you)
5) (d; intr., refl.) to keep from ('to refrain') (she could not keep from talking)
6) (d; tr.) ('to conceal') to keep from (to keep a secret from smb.)
7) (d; tr.) ('to hold back'); ('to prevent') to keep from (the rain kept us from going; don't keep her from her work)
8) (d; intr.) ('to remain') to keep off (keep off the grass)
9) (d; tr.) ('to hold') to keep off (keep the children off the street)
10) (d; intr.) ('to remain') to keep out of (keep out of my way; I kept out of their quarrel)
11) (d; tr.) ('to hold') to keep out of (keep the guests out of the house)
12) (d; intr.) ('to be confined') to keep to (she kept to her room)
13) (d; intr.) ('to continue') to keep to (to keep to the right)
14) (D; tr.) ('to reserve') to keep to (to keep a secret to oneself)
15) (G) ('to continue') she kept reading
16) (J) ('to cause') he kept us waiting
17) (N; used with an adjective, noun, past participle) (to maintain'); ('to hold') she kept us busy; they kept him prisoner; the fire kept us warm; she kept the children amused with her stories
18) (P; intr., tr.) ('to continue'); ('to hold') to keep right; to keep a car in a garage
19) (s) ('to remain') to keep quiet; to keep warm
