period pulse width and frequency measurements

... are dominant in iP and iN In other words, the ripple currents can be reduced by increasing the carrier frequency and the buffer inductance value Carefully looking into v∗ and iP in Fig reveals ... commands of chopper-cells and 2, v∗ and v∗ as follows: v∗ = v∗ − v∗ E + , (17) where a reasonable approximation of v∗ = v∗ = v∗ was A B1 B2 made Equation (17) implies that chopper-cells and were ... 70 V, and the ∗ dc voltage command of each chopper-cell was vC = 70 V The ac voltage command of the load was given by: √ v∗ = 2V0 sin 2π f t V0 = 25 V f = 50 Hz (20) The circuit parameters and...

Ngày tải lên: 15/10/2013, 16:24

... Martino Negri and Dr Sandak Jakub for the development of the device used during this mission Online control of wood peeling process: Acoustical and vibratory measurements of lathe checks frequency ... veneer samples were numbered and stored underwater before being characterized in IVALSA-CNR A specific device was designed and realised by Dr Martino Negri and Dr Jakub Sandak to measure synchronously ... control of wood peeling process: Acoustical and vibratory measurements of lathe checks frequency Figure Peaks detected on both preset vibration signal Xc and veneer profile from laser sensor for the...

Ngày tải lên: 07/08/2014, 16:21

... fluxes ψg and ψc φ Power factor angle xxvi List of Abbreviations DSP Digital Signal Processor PWM Pulse Width Modulation SPWM Sin Triangle Pulse Width Modulation SVPWM Space Vector Pulse Width Modulation ... =0.87 (a1 ) VU V and IW for NV scheme (a2 ) npf and FFT for NV scheme (b1 ) VU V and IW for SV scheme (b2 ) npf and FFT for SV scheme (c1 ) VU V and IW for NV + SV scheme (c2 ) npf and FFT for NV ... =0.93 (a1 ) VU V and IW for NV scheme (a2 ) npf and FFT for NV scheme (b1 ) VU V and IW for SV scheme (b2 ) npf and FFT for SV scheme (c1 ) VU V and IW for NV + SV scheme (c2 ) npf and FFT for NV...

Ngày tải lên: 14/09/2015, 08:37

... the future of our planet if we want to ensure a better world (10) our grandchildren A with B without C and D but A and B however C so D moreover A Where B When C Why D What A up B to C on D ... (3) can each of us do? We can not clean (4) our polluted rivers and seas overnight Nor we can stop the (5) of plants and animals But we can stop adding to the problem (6) scientists look ... _ I / like / use / internet / free time  _ My younger sister and brother / love / watch / cartoons / much _ III Complete the...

Ngày tải lên: 29/07/2013, 01:25

... any jokes, as I'm really bad at telling jokes So I'll no more than wish Jim and Sandra luck and hope they have a long and happy life together Business conversation Paula: David: David, I wonder ... drove at breakneck speed along the m o t o r w a y and was soon stopped by the police (carelessly fast and dangerous] Slow m o v e m e n t and stopping It was fascinating to see the winning goal ... the traffic slowed to a crawl and then finally came to a standstill He always does everything in an unhurried manner, (slow; implies slight criticism] We got up late and had a leisurely breakfast,...

Ngày tải lên: 01/11/2013, 11:20

... designed to monitor bearing, polarization, and frequency of AM or FM radiated signals A frequency discriminator uses a phase discriminator and adds a power divider and delay line at the RF input as shown ... reference and delay path The differential delay (T) creates a phase difference (2) between Signal "A" at the two signals which is a linear function of Frequency "f " frequency (f) and is given ... LO even harmonics Very Good: can reject all LO and RF even harmonics Used in various circuits, mixers can act as modulators, phase detectors, and frequency discriminators The phase discriminators...

Ngày tải lên: 23/01/2014, 01:20

... 3¢UTRs of Per1, and 3, respectively, in both the wild-type and mutated form Values represent a triplicate assay, in which the data are represented as the standardized mean ± standard error of ... and transcription of Drosophila period and timeless Cell 93, 805–814 Ripperger JA & Schibler U (2006) Rhythmic CLOCKBMAL1 binding to multiple E-box motifs drives circadian Dbp transcription and ... phosphorylation and degradation of Per proteins have been suggested to control timing of the mammalian clock [8] Moreover, BMAL1 and Cry proteins are subject to phosphorylation, SUMOylation and proteasomal...

Ngày tải lên: 18/02/2014, 06:20

... wife and husband seem to have closer and more intimate relationship than in American one so that Vietnamese people are more comfortable criticizing their spouses Of the family members, grandparents ... have everyday contact with their grandparents, and hence they seldom criticize them In summary, the investigation in the frequency of criticizing by the Vietnamese and the American reveals the fact ... govern its occurrence and forms of expression are culture dependent The topics of criticism, frequency of criticizing and factors that affect people’s decision to criticize and their criticizing...

Ngày tải lên: 28/03/2014, 11:20

... relationship between the frequency of a word, f , and its rank, z.6 He suggests that the frequency of a word is inversely proportional to its rank Mandelbrot has refined Zipf’s formula, and suggests a more ... are plotted in Figures and for different sizes of the Finnish and English corpora The search algorithm used in the probabilistic method and Recursive MDL involve randomness and therefore every value ... (Deligne and Bimbot, 1995) Nevertheless, in the near future we wish to explore possibilities of using complementary and more standard evaluation measures, such as precision, recall, and F-measure...

Ngày tải lên: 31/03/2014, 03:20

... breakpoints in the Chinese and Thai viruses were located in AV1, AV2, AC1 and AC4, whereas ORFs AV1 and AV2 were identified to be cold spots in the Bangladeshi viruses The frequency and locations of recombination ... recombinant forms, recombination hot spots and frequency of recombination documented in this study would provide new information for understanding the diversity and evolution of tomato-infecting begomoviruses ... Tomato yellow leaf curl Thailand virus-[1] Tomato yellow leaf curl Thailand virus-[2] Tomato yellow leaf curl Thailand virus-[Myanmar] Tomato yellow leaf curl Thailand virus-[Y72] Z48182 AF165098...

Ngày tải lên: 18/06/2014, 18:20

... Harmonics Analysis and Real Measurements Data Crectifier and Cac_cable are the capacitive couplings of the rectifier side and underground cable, respectively, with ground Rac_cable and Lac_cable make ... compatibility (EMC) Part 4-7: Testing and measurement techniques General guide on harmonics and interharmonics measurements and instrumentation for power supply and equipment connected thereto, International ... (a) current waveform and (b) FFT analysis of the waveform obtained, at node - - Adjustment of the firing pulses frequencies and control strategies to reduce or avoid resonance and capacitive currents...

Ngày tải lên: 18/06/2014, 22:20

... Spain XI Part Measurements Electric Power Systems Harmonics Identification and Measurements Soliman Abdelhady Soliman1 and Ahmad Mohammad Alkandari2 1Misr University for Science and Technology, ... fundamental frequency component and harmonic components with order of integral multiples of the fundamental frequency It is also assumed that the frequency is known and constant during the estimation period ... Quality Harmonics Analysis and Real Measurements Data Sources and problems of harmonics [2] Harmonic sources are divided into two categories: Established and known New and Future A review of the...

Ngày tải lên: 19/06/2014, 08:20

... and varied These parameters are the standard 14 Power Quality Harmonics Analysis and Real Measurements Data deviation of the noise, the number of samples, and the sampling frequency A Gaussiandistributed ... examination of the current and voltage waveforms indicated that the waveforms consist of (1) harmonics of 60 Hz and (2) a decaying periodic high -frequency transients The high -frequency transients were ... sampling interval and the oldest sample is discarded The new [A]+ for the latest m samples is calculated and the estimates of [] are 12 Power Quality Harmonics Analysis and Real Measurements Data...

Ngày tải lên: 19/06/2014, 08:20

... of the proposed filter for X1 and Y1 using models and Fig 28 Estimated magnitudes of 60 Hz and third harmonic for frequency drifts using models and   For a small frequency drift, f = -0.10 Hz, ... Identification and Measurements 33 drift both phase angles have large changes and the estimates produced are of bad quality Fig 29 Estimated phase angles for frequency drifts using models and To overcome ... decaying period high -frequency transients, and harmonics of less than 60 Hz (sub-harmonics) The waveform was originally sampled at a 118 ms time 34 Power Quality Harmonics Analysis and Real Measurements...

Ngày tải lên: 19/06/2014, 08:20

... El-Naggar, and A Al-Kandari, “Kalman Filtering Based Algorithm for Low Frequency Power Systems Sub-harmonics Identification,” Int Jr of Power and Energy Systems, Vol 17, No 1, pp 38-43, 1998 A Al-Kandari, ... high frequency transients, IEEE Trans On Inst And Meas., 38(6) (1989) 1057-1062 A A Girgis, M C Clapp, E B Makram, J Qiu, J G Dalton and R C Satoe, Measurement and characterization of harmonic and ... Electric Power Systems Harmonics - Identification and Measurements 67 P J Moore, J H Allmeling and A T Johns, “ Frequency Relaying Based on Instantaneous Frequency Measurement”, IEEE Transaction on...

Ngày tải lên: 19/06/2014, 08:20

... with a primary frequency between 300 and 900 Hz and magnitude of 1.3-1.5 p.u., and not longer than two 60Hz cycles Fig shows typical transient waveforms and frequency contents due to a capacitor ... [%] Power Quality Harmonics Analysis and Real Measurements Data Frequency Hz Fig Indices in function of frequency: (a) energy level, (b) coherence, (c) standard deviation, (d) quantization error ... The main interharmonic sources are adjustable speed drives (ASDs) with a p1 -pulse rectifier and a p2 -pulse inverter and periodically varying loads such as arc furnaces Their interharmonic generation...

Ngày tải lên: 19/06/2014, 08:20

... Fig.2 where low corner frequency of pass band flow and high corner frequency of pass band fhigh can be defined based on dB transfer ratio decrease margin assumption Low and high frequency response ... magnetizing and leakage impedances is presented in Fig 13, where characteristic resonance frequencies fr1, fr2, fr3 and related to them frequency bands B1, B2, and B3 are emphasized The frequency band ... noticeably VT pass band in high frequency range Fig Influence of source and load impedance on the VT pass band Broadband modelling of voltage transformers Modelling of VT in a wide frequency range...

Ngày tải lên: 19/06/2014, 08:20

... stages 1,2 and or 5,6 and The transistors conduct for the time of stages and 5, the freewheeling diodes – for the time of stages 3, 4, and 8, and the rectifier diodes – for the time of stages and The ... consideration and at regulation by changing the operating frequency Such characteristics are shown in fig 7-а for ν = 3.0; 3.3165; 3.6 and а1=0.1; а2=0.2 and in fig 7-b for ν =1.5; 1.6; 1.8 and а1=0.1; ... designed and made without a matching transformer and with the following parameters: power supply voltage U d = 500 V; output power P0 = 2.6 кW, output voltage U = 500 V; operating frequency and frequency...

Ngày tải lên: 19/06/2014, 08:20

... semiconductor devices The measurements have been done both for the firing angle values of 60, 90 and 1200 el., and load inductance values of 0.1, 10 and 50mH The results are shown in Fig 20 and Fig 21 750V ... Increasing triangle pulse series input power A series of increasing triangle pulses is shown in Fig and the equation which describes this series is given in (7) Fig Increasing triangle pulse series ... the graphics P1, P2 and P3 mean input powers and T1, T2 and T3 temperatures, respectively 3.1 Single-phase uncontrolled bridge rectifier The waveforms of the input powers and junction temperatures...

Ngày tải lên: 19/06/2014, 08:20

... series device, L1 and C make low-pass filter (LPF) to filter output voltage of Inverter because power electronics devices in Inverter open and close in high frequency and generate high frequency disturbances ... principle and the theory about the high power UPQC, some fundamental knowledge about harmonic and harmonic elimination equipments are list below 154 Power Quality Harmonics Analysis and Real Measurements ... in different forms and form many types of HAPF Because of its low cost, HAPF attracts more and more eyes and has been developing very quickly 2.3 UPQC: Combined shunt APF and series APF Unified...

Ngày tải lên: 19/06/2014, 08:20