tỷ lệ vốn đầu tư so với doanh thu của một số nước
Tài liệu Báo cáo khoa học: "Asynchronous Binarization for Synchronous Grammars" pptx
... symbols Binarization choice can also improve monolingual parsing efficiency (Song et al., 2008) The parsing stage of our decoder proceeds by first converting the source-side projection of the translation ... rebinarized (a) A source-binarized forest constructed while parsing the source sentence with the translation grammar (b) A flat n-ary forest constructed by collapsing out the source-side binarization ... node often share some substructures For instance, the two rules in Figure both begin with PRP followed by VBD In addition, these symbols are anchored to the same source-side spans Thus, binarizing...
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Tài liệu Báo cáo khoa học: "A module that computes coordinative ellipsis for language generators that don’t" pdf
... Finally, in Section 4, we discuss the prospects of extending the module to additional constructions Some theoretical background ELLEIPO is loosely based on Kempen’s (subm.) psycholinguistically motivated ... The module needs a formalism-dependent interface that converts gen1 The strategic component is also supposed to apply rules of logical inference yielding the conceptual structures that underlie ... is supposed to arise in the strategic, not the (syn)tactical component of the generator This also applies to simpler cases without respectively, such as John is skating and Peter is skating versus...
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Báo cáo khoa học: "A Tree Transducer Model for Synchronous Tree-Adjoining Grammars" pdf
... different For each k ≥ 0, we let Xk = {x1 , , xk } We can also form trees over the alphabet Σ To allow some more flexibility, we will also allow leaves from a special set V Formally, a Σ-tree over ... Σ} be the extended set of labels containing also the substition symbols The substitution of Figure can then be ex2 A-proper trees are sometimes also called A-context in the literature This remains ... (2008) More precisely, every extended tree transducer computes such a set, so that also this step is a characterization Thus we obtain that τ is an evaluation of a tree transformation computed...
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synchronous generators chuong (1)
... wind power resources of the planet are estimated at 15,000 terra watthours (TWh), so much more work in this area is to be expected in the near future Another indirect means of using solar energy, ... energy conversion Solar radiation may be used either through heat solar collectors or through direct conversion to electricity in photovoltaic cells From an average of kW/m2 of solar radiation, ... has become not only a technical issue, but also an ever-increasing social (public acceptance) problem Even hydro- and wind-energy conversion pose some environmental problems, though much smaller...
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synchronous generators chuong (2)
... forces by rings of highly resilient resin materials, thus becomes necessary Also, the DC rotor current airgap field distribution is closer to a sinusoid Consequently, the Stator open uniform slotting ... the socalled homopolar (or inductor) synchronous machine (generator and motor; see Figure 2.14a through Figure 2.14c) The rather rugged rotor with solid (even laminated) salient poles and solid ... system so as to work not only on the power grid, but also to separate itself smoothly to operate as a stand-alone or to wait on standby and then be reconnected smoothly to the power grid Thus,...
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synchronous generators chuong (3)
... off-highway vehicles), autonomous power sources Large and distributed electric power systems, autonomous power sources Distributed power systems, autonomous power sources Gas turbines, diesel engines, ... direction, thus exerting a tangential force on the turbine rotor blades Torque on the shaft and, thus, mechanical power, are produced The pressure along the turbine stages decreases, and thus, the ... is characteristic of this delay [4] The crossover piping also introduces a delay that may be characterized by another time constant TCO We should also consider that the HP, IP, and LP stages produce...
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synchronous generators chuong (4)
... reactive power absorption (Q1 < 0) This phenomenon is so strong because the retaining ring solid iron eddy currents (produced solely by the stator end-windings currents) are small and thus incapable ... X0, we refer to some experiments to measure them so that we get some confidence in using the above theory of symmetrical components 4.12 Measuring Xd, Xq, Z–, Z0 We will treat here some basic measurement ... all losses, the phasor diagram in Figure 4.16a, for cos ϕ1 = 1, can be shown -jXd Id E1 -jXq Iq V1 δv = δ i = 30 Iq I1 If Id Phasor diagram for cos ϕ1 = and zero losses The phasor diagram uses...
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synchronous generators chuong (5)
... are nonzero; thus, Equation 5.166 has to be solved as it is: H d Δδ V K as Δδ V + d + t es Δδ V = ΣΔt shν cos ( Ω ν t − Ψ ν ) ω b dt ωb dt (5.176) Again, the steady-state solution is sought: Δδ ... lqm)Iq0 δV0 −jωrψs0 Generator torque VS0 − rsIso FIGURE 5.5 The space-phasor (vector) diagram of synchronous generators We may now introduce space phasors for the stator quantities: Ψ s = Ψ d + ... 1fD1 Axis d Axis d Solid rotor pole Eddy currents 1fD1 Solid rotor body (a) (b) FIGURE 5.15 The leakage coupling inductance lfDl: (a) salient-pole and (b) nonsalient-pole solid rotor d θe = ω...
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synchronous generators chuong (6)
... made along this path so far are very encouraging In what follows, the basics of speed and voltage control are given, while ample reference to the newest solutions is made, with some sample results ... integral action is slow and thus overrides the effects of the composite frequency regulation characteristics of the isolated power system (made of all SGs in parallel) Thus, the generation share ... J.C Agee, Comparison of power system stabilizers for damping local mode oscillations, IEEE Trans., EC-8, 3, 1993, pp 533–538 12 A Murdoch, S Venkataraman, R.A Lawson, and W.R Pearson, Integral of...
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synchronous generators chuong (7)
... power systems Their prime function is to produce the active power However, they are also required to provide (or absorb) reactive power both, in a refined controlled manner, to maintain frequency and ... (class B, in general, ΔT = 130°), more excitation mmf means a larger rotor volume and, thus, a larger SG Also, the SCR has an impact on SG efficiency An increase of SCR from 0.4 to 0.5 tends to ... critical clearing time and so does a large inertia Air-cooled SGs tend to have a larger inertia/MW than hydrogen-cooled SGs, as their rotor size is relatively larger and so is their inertia 7.2.3...
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synchronous generators chuong (8)
... solve the problem of saturation influences on the identified model DC premagnetization is required only for frequencies above Hz Thus, the time to apply large DC currents is somewhat limited, so ... machine or to an infinite power source 8.1.14 A14: Acoustic Noise Airborne sound tests are given in IEEE standard 85-1973 and in ANSI standard C50.12-1982 Noise is undesired sound The duration in hours ... field current is also acquired, the stator armature time constant Ta may also be determined The DC decay stator short-circuit current components from all three phases may also be extracted from...
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synchronous generators chuong (9)
... from authentic and highly regarded sources Reprinted material is quoted with permission, and sources are indicated A wide variety of references are listed Reasonable efforts have been made to ... ION BOLDEA Polytechnical Institute Timisoara, Romania © 2006 by Taylor & Francis Group, LLC Published in 2006 by CRC Press Taylor & Francis Group 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, ... kinetic energy and wind energy are also converted to mechanical energy in a prime mover (turbine) that, in turn, drives an electric generator All primary energy resources are limited, and they have...
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Báo cáo khoa học: "Efficient Multi-pass Decoding for Synchronous Context Free Grammars" pdf
... requests for the k-bests of some of its children and grandchildren and so on, because re-ranking at each node is needed to get the top ones Venugopal et al (2007) also take a two-pass decoding ... boosting the search for the higher-order model By doing so, we hope the intrinsic metric of our model agrees with the extrinsic metric of evaluation so that fast search for the model is equivalent to ... to achieve early stopping as suggested by Huang and Chiang (2007) Also, we did not have a translation-model-only pruning pass So the results shown in this paper for the lazy cube pruning method...
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An Object Behavioral Pattern for Demultiplexing and Dispatching Handles for Synchronous Events docx
... server The SOCK Acceptor and SOCK Stream classes used to implement the logging server are part of the C++ socket wrapper library provided by ACE [9] These socket wrappers encapsulate the SOCK Stream ... Gamma, R Helm, R Johnson, and J Vlissides, Design Patterns: Elements of Reusable Object-Oriented Software Reading, MA: Addison-Wesley, 1995 [6] D C Schmidt and P Stephenson, “Experiences Using ... occurs on a source of events The Reactor pattern is generally used to demultiplex events from multiple sources to their associated event handlers, whereas an Observer is often associated with...
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Altivar 71Variable speed drives for synchronous motors and asynchronous motors Installation pptx
... page, so you can access the slot for the encoder feedback card • If an I/O or communication option card or a "Controller Inside" programmable card has already been installed, remove it so you ... PA, PB RO, SO, TO (1) x 100 mm2/24Nm x 150 mm2/41 Nm 60 mm2 /12 Nm 5.5 mm2/1.4 Nm x 250 MCM/212 lb.in x 250 MCM/360 lb.in 250 MCM/106 lb.in AWG 10/12 lb.in (1) Fan power supply, compulsory if the ... PA, PB RO, SO, TO (1) x 120 mm2/24 Nm x 120 mm2/24 Nm 120 mm2/24 Nm 5.5 mm2/1.4 Nm x 250 MCM/212 lb.in x 250 MCM/212 lb.in 250 MCM/212 lb.in AWG 10/12 lb.in (1) Fan power supply, compulsory if the...
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Schneider Electric-Altivar 71 Variable speed drives for synchronous motors and asynchronous motors potx
... RS422-compatible differential outputs with encoder emulation Resolver absolute encoder SinCos incremental, SinCosHiperface absolute, EnDat absolute, SSI absolute encoders The VW3 A3 408, VW3 A3 409 encoder ... SW1 LI1 Int A1 Source ATVp1Hppppp +24 Sink A1 Ext +24 Source SW1 • Switch SW1 set to “Source” position and use of an external power supply for the LIs LI1 • Switch SW1 set to “Source” position ... in “Source” position • Switch in “Source” position and use of an external +24 Vc supply source SW3 or SW4 SW3 or SW4 VW3 A3 20p Int CLO Ext LOp CLO LOp +24 Int LIp Sink LIp Ext 0V Sink A1 Source...
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VCM 2012 11 Đề xuất phương pháp kích từ cho máy phát đồng trục sử dụng máy điện dị bộ nguồn kép trong trạm phát điện tàu thủy A novel excitation method for shaft generators using doublyfed induction machines on power –station on shipboards
... lưới điện đơn giản hiệu quả: thành phần công suất tác dụng P tỷ lệ với hệ số Kp, thành phần công suất phản kháng Q tỷ lệ thu n với số Kq, việc thiết kế khiển thành phần công suất sau đơn giản ... tác dụng tạo tín hiệu đầu đồng dạng với tín hiệu đầu vào cách ly với tín hiệu đầu vào đó, tức dòng tải tín hiệu đầu không gây ảnh hưởng méo hay nhiễu cho tín hiệu đầu vào Đầu khâu đồng dạng đưa ... lai máy Vì độ lệch pha với góc α cố định nên để giải việc triệt tiêu góc lệch pha ta cần xoay lệch trục máy điện máy điện góc α để bù lại lệch pha chí thành phần R s i sf nhỏ so với điện áp lưới...
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Tài liệu Manual for induction motors and generators ppt
... shall be carried out by responsible skilled persons (in conformity with EN 50 110-1 / DIN VDE 0105 / IEC 60364) Improper handling may cause serious personal injury and damage to property Danger! ... instructions Installation Make sure of even support, solid foot or flange mounting and exact alignment in case of direct coupling Avoid resonances with rotational frequency and double mains frequency ... obstructed and the exhaust air, also of neighbouring sets, not taken in directly Electrical connection All operations must be carried out only by skilled persons on the machine at rest Before...
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Tài liệu Báo cáo khoa học: "A Gibbs Sampler for Phrasal Synchronous Grammar Induction" docx
... between each source word sampling whether a terminal boundary should exist at that position (Figure 2) If the source position |s| VX where the PP oisson (k; 1) is the probability under a Poisson distribution ... terminals sharing the same parent The dashed line indicates the source position being sampled, boxes indicate source and target tokens, while a solid line is a null alignment the Split/Join operator ... al., 2008b; Blunsom et al., 2008) However this asymptotic time complexity is of high enough order (O(|f |3 |e|3 )) that inference is impractical for real translation data Proposed solutions to this...
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Tài liệu Báo cáo khoa học: "A Flexible Pragmatics-driven Language Generator for Animated Agents" doc
... to whether the generator was asked to produce exactly one solution or select at random a solution from a set of at most ten generated solutions (the latter strategy was implemented to obtain more ... the attribute currentAct is passed on from the mother node to the daughter nodes Thus any pragmatic information (personality, politeness, emotion, etc.) is passed on through the tree and can be ... representation of a tree is of the That is, PROLOG with some sugaring for the representation of feature structures Feature structures are also used in the FUF/SURGE generator It is different from...
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