high frequency matrix converter

Ngày tải lên: 13/08/2014, 14:04

Ngày tải lên: 06/08/2014, 10:20

Ngày tải lên: 07/08/2013, 15:34

... and frequency in a wide range is achieved by means of suitable power converter and corresponding controller. The range of amplitude oscillation for most EVCD is 0.1mm-100mm, while the frequency ... the power supply network is fixed frequency, with PAC is only possible to adjust amplitude oscillations of EVCD but not their frequency. With transistor power converter it is possible to achieve ... the current control with a relatively high switching frequency, while the generation of triangular wave is based on the programmed current control at lower frequency. This second method has the...

Ngày tải lên: 03/01/2014, 19:15

... existence. extinguish To render extinct. extirpate To root out; to eradicate. extol To praise in the highest terms. extort To obtain by violence, threats, compulsion, or the subjection of another...

Ngày tải lên: 17/01/2014, 05:20

... between conversation partners: the use of high- frequency words, the most frequent words in the dialogue or corpus. In Section 2 we describe ex- periments on high- frequency word entrainment and perceived ... the degree of entrainment in high- frequency word usage, we examined 48 dialogues. We computed the correlation coefficient between the game score (nor- malized by the highest achieved score for the ... pages 169–172, Columbus, Ohio, USA, June 2008. c 2008 Association for Computational Linguistics High Frequency Word Entrainment in Spoken Dialogue Ani Nenkova Dept. of Computer and Information Science University...

Ngày tải lên: 08/03/2014, 01:20

... of the ab- sorption band at a higher -frequency side [3]. Among these absorption bands, the intensity of 1070 cm À1 is much stronger than the features at its high- frequency side even when the structural ... the higher -frequency side around 1170– 1200 cm À1 . In order to understand clearly the in- fluence of Si–O bond stretching on the shape and intensity of the spectra of samples B and C at a higher ... High- frequency FTIR absorption of SiO 2 /Si nanowires Quanli Hu * , Hiroshi Suzuki, Hong Gao, Hiroshi...

Ngày tải lên: 16/03/2014, 15:05

... these results appear to be new in the statistical literature of high frequency data. The problem of finding the MLE based on very high frequency data remains a challenging numerical problem, even ... that neither high frequency sampling nor maximum likelihood Contents vii part Two Long Range Dependence Models 117 6 Long Correlations Applied to the Study of Memory Effects in High Frequency (TICK) ... neither MLE nor high frequency data seem to do better than standard moment estimators and daily data. For κ, the estimation error can be reduced as much as 4 times when using high frequency data...

Ngày tải lên: 22/03/2014, 09:20

... RESEARCH Healthy Aging & Clinical Care in the Elderly 2011:3 1 High Degree of Adherence to Statin Therapy Among the Elderly Despite High Frequency of Side Effects Fadi Chedid 1 and Magnus Falk 2,3 1 Ljungsbro ... conclusion, elderly patients appear to exhibit a high degree of adherence to statin treatment despite a high incidence of side effects. Simvastatin is used in higher doses in hospital clinics compared ... symptoms as side effects, the overall rate was 15%. Adherence related to side effect frequency Adherence was higher (92%) among the patients who reported no side effects from their medication...

Ngày tải lên: 22/03/2014, 14:20

... Computational Linguistics Efficient Unsupervised Discovery of Word Categories Using Symmetric Patterns and High Frequency Words Dmitry Davidov ICNC The Hebrew University Jerusalem 91904, Israel dmitry@alice.nc.huji.ac.il Ari ... sets of words shar- ing a significant aspect of their mean- ing. We utilize meta-patterns of high- frequency words and content words in or- der to discover pattern candidates. Sym- metric patterns ... re- lationships. We do this in a fully unsuper- vised manner, using meta-patterns comprised of high frequency words and content words. 2. Identification of pattern candidates that give rise to symmetric...

Ngày tải lên: 23/03/2014, 18:20

... Human bile salt-stimulated lipase has a high frequency of size variation due to a hypervariable region in exon 11 Susanne Lindquist 1 , Lars ... gene encodes 16 proline-rich repeats is an oversimpli®cation and needs to be revisited. This high frequency of variation in the BSSL gene corresponds very well with a previous study on incidence of ... donors, digested with PstI and hybridized to probe A (Fig. 3) in Southern blot experiments. A high frequency of variation was found. Only 131 out of the 295 (44%) DNA samples showed a restriction...

Ngày tải lên: 24/03/2014, 03:21

... bandwidth (bw) is defined as the highest frequency minus the lowest frequency. In this case, it is (f c + f m ) – (f c – f m ) = 2f m where f m is the highest modulation frequency. Hence, a radio receiver ... (min) (1.5) According to Carson’s rule, the frequency bandwidth required for wideband FM is approx- imately 2 × (maximum frequency deviation + highest frequency present in the message signal) or bw ... sections. The first i.f. section operates at a much higher i.f. frequency than the second i.f. section. This choice is deliberate because a higher 1st i.f. frequency gives better image channel rejection....

Ngày tải lên: 18/04/2014, 12:24

... be treated with caution since, very high frequency observations bring with it new factors that introduce noise for analysis. In this paper, we have used high frequency price data in a variance ... This high frequency data (HF data) constitutes price and volumes data that can be observed at intervals that are as small as a second. The analysis of serial correlations with such high frequency ... well as trading intensity. Keywords: Variance-Ratios, High Frequency Data, Market Liquidity Contents 1 Introduction 3 2 Issues 5 2.1 Choice of frequency for the price data . . . . . . . . . . ....

Ngày tải lên: 24/04/2014, 00:23

... come 24 HIGH- FREQUENCY TRADING orders that may or may not be placed algorithmically. Similarly, while most high- frequency trading systems are algorithmic, many algorithms are not high- frequency. “Low-latency ... 19:8 Printer: Yet to come 28 HIGH- FREQUENCY TRADING Cost Time in development and use High- frequency trading Traditional trading FIGURE 3.3 The economics of high- frequency versus traditional trading ... the Business of High- Frequency Trading 31 standard approach for designing and implementing high- frequency trading systems. The implementation of the run-time components of the high- frequency trading...

Ngày tải lên: 03/05/2014, 13:09

... for the matrix converter fault tolerance problem. Index Terms—Fault diagnosis, fault tolerance, matrix converter, pulsewidth modulation, reliability. NOMENCLATURE V A ,V B ,V C Matrix converter ... next. The matrix converter can be modeled as a two-stage rectifier/ inverter converter with no dc-link storage, as shown in Fig. 2. The relationship of the switching patterns between matrix converter ... a, NGUYEN-DUY et al.: IMPROVEMENT OF MATRIX CONVERTER DRIVE RELIABILITY 247 Fig. 2. Equivalent two-stage converter topology. Fig. 3. Virtual dc-link voltages for a matrix converter. where x denotes the...

Ngày tải lên: 13/05/2014, 00:55

... matrix converter is proposed for telecommunication ap- plications. In the proposed approach, the matrix converter directly converts the low frequency (50/60 Hz, three-phase) input to a high frequency ... shown that matrix converter output can be found from (18) Equation (18), the transfer function, , is representing the matrix converter switching function. Thus, switching function of matrix converter ... input source voltage is converted to high frequency voltage through operation of three-phase to one- phase matrix converter. From (1) and (2), the matrix converter output voltage is given by (21) From...

Ngày tải lên: 13/05/2014, 00:55

... This paper discloses a novel matrix topology with advantages over the usual matrix converter topology. Firstly, it has the same performance as a conventional matrix converter in terms of voltage ... The matrix converter, first introduced in 1980 [1], has experienced revived attention recently. The matrix converter topology is shown in Fig. 1. Compared with the conventional AC/DC/AC converter, ... a matrix converter topology is developed which has not yet been previously reported. The new converter has following advantages: • It has the same performance as the conventional matrix converter, ...

Ngày tải lên: 13/05/2014, 00:55

... a conventional 2-level drive (Figure 3a) and the AC7 Matrix Converter (Figure 3b). The distance between the motor and drive is 328 ft. (100 m). The AC7 Matrix Converter suppresses surge voltage by 20 to ... Specifications Major specifications for the AC7 Matrix Converter are given in Table 1 with product photos shown in Figure 6. Table 1: AC7 Matrix Converter Product Specifications Figure 6: AC7 ... "Motor Drives Using Matrix Converter Technology" (in Japanese), Yaskawa Technical Review, Vol. 64, No. 247, P. 111 (2000, No. 2). [3] J-K.Kang, H.Hara, et al., "The Matrix Converter drive...

Ngày tải lên: 13/05/2014, 00:55

Ngày tải lên: 13/05/2014, 00:55

Ngày tải lên: 13/05/2014, 00:55