Dictionary of Meaning
<<Back
Please select a letter:
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
M |
N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
0-9
Click here for Shopping
EAST
*** Shopping-Tip: EAST
Image:CompassRose16_E.png thumb|350px|right|A compass rose with east highlighted
:''For other uses, see
East (disambiguation).''
'''East''' is most commonly a
noun,
adjective, or
adverb indicating
direction or
geography.
East is one of the four
cardinal directions or
compass points. It is the opposite of
west and at right angles to
north and
south.
By
convention, the right side of a terrestrial (ordinary)
map is east. On the contrary, the ''left'' side of a star chart (a map of the skies) is east. (This is because we look upwards to the sky and downwards on the earth - a change of perspective.) This convention dates from the
Renaissance; many
medieval maps place the east on the top of the map - hence the verb ''
Wiktionary:orient orient.''
To go east using a compass for
navigation, set a
Bearing (navigation) bearing or
azimuth of 090°.
East is the direction from which the
sun rises at the
equinox, and therefore the direction in which the Earth rotates about its axis. Another consequence is that it is the preferred direction of space launches, because of the saving of
delta-v.
Moving continuously east is following a
circle of latitude, which, except in the case of the
equator, is not a
great circle.
Whenever there is a
rotational motion, the four directions can be defined. When one side of the
plane of motion is taken as north, then observed from north, the anticlockwise direction is east, considering north as "up".
The etymology of "east" is from an old
Indo-European word for
dawn. ''Cf''.
Latin ''aurora'' and
Greek language Greek ''eÅ?s''. ''
Eostre'', a Germanic goddess of dawn, might have been a personification of both dawn and the cardinal point—her actual existence is highly disputed, however.
Category:Orientation
als:Osten
ar:شرق (اتجاه)
br:Reter
bg:Изток
ca:Est
da:Øst
de:Osten
es:Este
eo:Oriento
fa:خاور
fr:Est
gl:Leste
id:Timur
is:Austur
it:Est
he:מזרח
lt:Rytai
nl:Oost
ja:æ?±
no:Øst
nn:Aust
pl:Wschód
pt:Leste
ru:ВоÑ?ток
simple:East
sl:Vzhod
sr:ИÑ?ток
fi:Itä
sv:Öster
ta:கிழக�க�
zh:æ?±
The '''Experimental Advanced Superconducting Tokamak''' (EAST, internally called HT-7U) is a project being undertaken to create a
superconducting tokamak magnetic fusion energy reactor in
Hefei, capital city of
Anhui Province, in east
China. The experiment is being conducted by the Hefei-based
Institute of Plasma Physics under the
Chinese Academy of Sciences. The project was proposed in 1996 and approved in 1998. According to a 2003 schedule, buildings and site facilities were to be constructed by 2003, and tokamak assembly to take place from 2003 through 2005.
In March 2006 Xinhua News reported that construction was complete. EAST is to conduct its initial test discharge sometime during July and August 2006. The first experiments of the reactor will be to create an ohmic plasma. Scientists will study the properties of this type of plasma for further research in the field of plasma physics.
The reactor is an improvement over China's first superconducting Tokamak device, dubbed
HT-7, also built by the Institute of Plasma Physics in partnership with
Russia in the early
1990s.
According to official reports, the project's budget is a relatively small 300 million
Renminbi yuan, approximately 37 million
U.S. dollars.
Physics objectives
China is a member of the
ITER consortium, and EAST will be a testbed for technologies proposed for the ITER project.
EAST will test:
*Superconducting NbTi poloidal field magnets, making it the first tokamak with superconducting toroidal and poloidal magnets
*Non-inductive current drive
*Pulses of up to 1000 seconds with 0.5 MA plasma current
*Schemes for controlling plasma instabilities through real-time diagnostics
*Materials for divertors and Plasma Facing Components
*Operation with ''β''
N = 2 and ''H''
89 > 2
Tokamak parameters
{| border="1" cellspacing="0"
| Toroidal field, ''B''
θ || 3.5 T
|-
| Plasma current, ''I''
P || 0.5 MA
|-
|Major radius, ''R''
0 || 1.7 m
|-
|Minor radius, ''a'' || 0.4 m
|-
|Aspect ratio, ''R''/''a'' || 4.25
|-
|Elongation, ''κ'' || 1.6 - 2
|-
|Triangularity, ''δ'' || 0.6 - 0.8 　
|-
|Ion cyclotron resonance heating (ICRH) || 3 MW
|-
|Lower hybrid current drive (LHCD) || 4 MW
|-
|Electron cyclotron resonance heating (ECRH) || 0.5 MW
|-
|Neutral beam injection (NBI) || None currently
|-
|Pulse length || 1-1000 s
|-
|Configuration || Double-null divertor
Pump limiter
Single null divertor
|}
{{fusion power}}
External links
-
Chinese Academy of Sciences Institute of Plasma Physics - EAST
-
People's Daily article
-
Xinhua article Mar 1 2006 - Note that EAST is obviously not the "world's first experimental nuclear fusion device".
-
Xinhua article Mar 24, 2006 Nuke fusion reactor completes test
{{nuclear-stub}}
Category:Fusion reactors
*** Shopping-Tip: EAST
