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Introduction The voltage stability is the ability to keep or recover the power voltage within the limits of safety without voltage collapse after the power system suffers small or large disturbances[1].
Tab.1 The corresponding relationship of VCCT and line power in receiver system VCCT（s） Line active power（MW） VCCT margin VTTC margin 0.079 0.087 0.097 0.107 0.12 0.13 0.144 0.161 0.179 0.242 0.34 0.496 510. 495. 479. 464. 450. 434. 419. 404. 389. 345. 290. 198. -0.519 -0.379 -0.237 -0.121 0.000 0.077 0.167 0.255 0.330 0.504 0.647 0.758 -0.120 -0.093 -0.063 -0.032 0.000 0.035 0.072 0.111 0.154 0.301 0.548 1.268 Two indexes of VCCT margin and VTTC margin are defined as follows: (1) (2) The simulation result shows that when transmitted power is less than 180MW, VCCTs are basically the same no matter how large transmitted power is; when transmitted power is larger than 550MW, the voltage of receiver system will always lose stability no matter how small the failure clearing time is.
References [1] IEEE/CI GRE Joint Task Force on Stability Terms and Definition．Definition and classification of power system stability[J]．IEEE Trans on Power Systems，2004，l9(2)：1387- 1401
Electric Power Systems Research，1991，21(1)：9-16
Automation of Electric Power System 2005．33（7）: 1-5．

The mass ratio of ball and mixed powder was 30:1 and steel balls with 12 mm diameter were introduced.
As shown in Fig. 1, the grain size of α-Fe is larger than the calculated value.
Reference [1] E.F.
Xie: Materials Science Forum, Vols 475-479 (2005), p.2165 [5] M.
Street: Journal of Alloys and Compounds, Vol. 240 (1996) No.1, p.200 [10] R.

Convergence criteria are determined by the energy, stress and displacement of each atom, which are set as less than 1×10-4 Ha, 0.02 Ha/Å and 5×10-3Å.
Fig.1 Models for CSi (a) and SiC (b) of defects in a (6,2) SiCNT.
The Brillouin zone sampling is performed using special k points generated by the Monkhorst-Pack grid with a value of 1×1×8, which is suitable to one dimensional materials[20].
References [1] S.
Mater. 6 (2007) 479

Pure copper is represented by UNS numbers C10100 to C13000 [1-2].
Results and Discussions Microstructure of ingot and billet of copper M2 are shown in Fig. 1.
a b c d Fig. 1.
References [1] K.J.A.
Chikova, The forming mechanism of ultradispersed phases in rapidly solidified aluminium alloys, Nanostructured Materials, 6(1-4) (1995) 477-479

And the atomic ratio of Y and Sb in the mixture of Y2O3 and Sb2O3 are designed as 0, 1:5, 1:2, 1:1, 2:1, 5:1 and ∞.
When it increased up to 1:1, except the dominant ZnO phase, Y2O3 phase would appear, the spinel phase disappear, and an Y-Sb-O phase could also be detected.
(d) (c) (b) (a) (f) (e) (h) (g) Fig. 2 Typical SEM micrographs of samples with different ratios of Y:Sb: (a) 0, (b) 1:5, (c) 1:2, (d) 1:1, (e) 2:1, (f) 5:1, and (g) ∞.
References [1] F.
Mater. 368-372 (2008) 479-482

Table 1: The preliminary experimental campaign.
Table 3: The 2k-1 fractional factorial experimental plane
# A B C D 1 -1 -1 -1 -1 2 -1 1 1 -1 3 1 1 -1 -1 4 1 1 1 1 5 -1 -1 1 1 6 1 -1 1 -1 7 1 -1 -1 1 8 -1 1 -1 1 Discussion of the results The preliminary experimental campaign highlighted the same performance at varying of the tool speed; in particular, for all the investigated materials, the amax angle was not sensitively dependent on the feed rate within the investigated range.
References [1] H.
Micari: Advanced Material Research, Vol. 6-8 (2005), pp. 479-486

Designing of Details Taking into Account Degradation of Structural Ceramics at Exploitation Valery Kuzin 1, a *, Sergey Grigoriev 1, b, Marina Volosova 1, c, Mike Fedorov 1, d 1 University «Stankin», Vadkovsky per. 3a, Moscow, Russia a kyzena@post.ru, b rector@stankin.ru, c science@stankin.ru, d miklef8@yandex.ru Keywords: Ceramics, Structural element, Microstress, Damage, Crack, Failure, Barrier, Designing Abstract.
The simplest stress distribution is formed under the action of concentrated force; stress intensity changes within the range σi = 97 – 149 MPа (КΔ = 1,53) и σi = 91 – 125 МPа (КΔ = 1,37) at the interfaces 1 and 2 respectively.
As a result of the heat flux stress intensity changes within the range σi = 83 – 464 МPа (КΔ = 5,59) и σi = 280 – 482 МPа (КΔ = 1,73) at the interfaces 1 and 2 respectively.
References [1] S.
Res. 31 (2011) 479-483

Rogoff [1] pointed out that it is very difficult to “reconcile the extremely high short-term volatility of real exchange rates with the glacial rate at which deviations from PPP seem to die out.”
References [1] Rogoff .K.
Journal of the Japanese and International Economies ,1997 , 11 (4) , 441 —479
Journal of International Money and Finance , 2005 , 24 (1) , 121 —138
Statist., vol. 41, no. 1, pp. 164–171, 1970

The stent model generated with the Pro/Engineer program is shown in Fig. 1.
Fig. 1.
Table 1.
References [1] W.
C 42 (2014) 479-488

Fig. 1.
Table 1.
References [1] Savin V.K.
Part 1.
P.479.