vốn bình quân sử dụng trong kỳ

Ngày tải lên: 20/02/2014, 09:20

Ngày tải lên: 22/02/2014, 02:20

... problem and certain dependency problems, Shieber and Schabes (1990) and Shieber (2007) suggest a stronger model called synchronous tree-adjoining grammar (STAG), which in addition to the substitution...

Ngày tải lên: 17/03/2014, 00:20

Ngày tải lên: 21/03/2014, 12:12

... that house copper bars short-circuited by copper rings to form a rather complete squirrel cage A stronger damper cage was thus obtained © 2006 by Taylor & Francis Group, LLC 2-6 Synchronous Generators ... rotor may self-excite on a capacitor at its terminals (Figure 2.15b) For an IG connected to a strong (constant frequency and voltage) power grid, when the speed n increases (above f1/p1), the...

Ngày tải lên: 21/03/2014, 12:12

... in a constant voltage and frequency power system, the speed drop is very small, which implies strong strains on the speed governor due to inertia and so forth It also leads to slower power control ... is as follows: Cp = 8P ρπDr2 ⋅U (3.64) In general, Cp is a single maximum function of λ that strongly depends on the type of the turbine A classification of wind turbines is thus in order: • ... favors variablespeed wind turbines There are two methods (Figure 3.58) used to limit power during strong winds (U > Urated): • Stall control • Pitch control Stalled blades act as a “wall in the wind.”...

Ngày tải lên: 21/03/2014, 12:12

... slots (Figure 4.8a) are protected from centrifugal forces by slot wedges that are made either of strong resins or of conducting material (copper), and the end-windings need bandages © 2006 by Taylor ... characterized by very low flux density (Figure 4.23d) This is so because the armature reaction strongly reduces the resultant emf E1res to E1res = − jX1l ⋅ I sc = E1 − jX dm I sc (4.86) which ... and around 30 to 40° for salient pole rotor SGs The lower speed, higher relative inertia, and stronger damper cage of the latter might secure better stability, which justifies the lower power...

Ngày tải lên: 21/03/2014, 12:12

Ngày tải lên: 21/03/2014, 12:12

... B), and 100% power (point C) In strong power systems, the load reference signal changes the power output and not its speed, as the latter is determined by the strong power system © 2006 by Taylor ... 6-2 Synchronous Generators When a generator acts alone on a load, or it is by far the strongest in an area of a power system, its frequency may be controlled via generator speed, to remain ... LC circuit with negative resistance Electrical oscillations will self-excite at large levels A strong damper winding in the SG or an additional resistance in the power line would solve the problem...

Ngày tải lên: 21/03/2014, 12:12

... subject to agreement between vendors and purchasers of SGs, based on ′ operating conditions (weak or strong power system area exciter performance, etc.) To limit the peak short-circuit current and circuit...

Ngày tải lên: 21/03/2014, 12:12

... estimation for dynamics analysis is presented In addition, a few new (research) testing methods with strong potential to become standards in the future are also treated in some detail Note that the ... The saturation level is very low in SSFR tests, while in real SG transients, the rotor core is strongly DC magnetized, and the additional (transient) frequency currents in the solid iron occur ... cylindrical solid-rotor SGs, third-order models were introduced (Figure 8.34) There is still a strong debate over whether one or two leakage inductances are required to fully represent such a...

Ngày tải lên: 21/03/2014, 12:12

Ngày tải lên: 21/03/2014, 12:12

... cost using a trigram model since a bigram language model and a trigram language model must be strongly correlated Although we lose the guarantee that the bigram-pass outside estimate is admissible,...

Ngày tải lên: 23/03/2014, 17:20

Ngày tải lên: 30/03/2014, 16:20

... drive, please refer to the manual supplied with the kit Check that the back of the enclosure is strong enough to support the weight of the drive Use the dissipated power table on the previous page...

Ngày tải lên: 28/06/2014, 16:20

Ngày tải lên: 28/06/2014, 16:20

... kép công suất nhỏ có tác dụng tạo tín hiệu suất điện động cảm ứng đồng dạng rotor  Khâu đồng dạng cách ly sức điện động rotor máy điện 1: mạch khuếch đại tín hiệu sử dụng khuếch đại thuật toán ... máy (ME) thay đổi theo tình biển khả đồng máy phát đồng trục lưới điện lớn, để giải vấn đề ta sử dụng máy điện dị rotor dây quấn làm việc chế độ máy phát cấp nguồn từ hai phía (DFIG: Doubly – ... suất: Công suất tác dụng công suất phản kháng máy phát là:  P  3.2 U s I s cos    Q  3.2 U s I s sin   ( 22.a , b ) Với 2Us, 2Is điện áp cường độ dòng điện hiệu dụng pha máy phát, φ...

Ngày tải lên: 25/07/2015, 07:26

... nearby not heat the machine cooling air or constructions such as bearings The foundation must be strong, rigid, flat and free from external vibration The possibility of machine resonance with the...

Ngày tải lên: 26/01/2014, 09:20

... an expected length of 1, while VX is the vocabulary size of language X This distribution has a strong bias towards short strings In particular note that generally a string of length k will be ... translation pairs, such as Arabic-English, the benchmark GIZA++-based system is well suited due to its strong monotone bias (the sequential Markov model and diagonal growing heuristic) We conduct experiments ... scalable and effective method for performing inference over phrasal SCFG, without compromising the strong theoretical underpinnings of our model Discussion and Conclusion Table 4: NIST Arabic to English...

Ngày tải lên: 20/02/2014, 07:20

Ngày tải lên: 22/02/2014, 02:20