نتایج جستجو برای: pulse modulation

تعداد نتایج: 231550  

2015
Xiangzheng Xu

This paper analyzes the mechanism of the fast response characteristic of a magnetically controlled reactor and response characteristic of magnetically controlled reactor in semi-limit saturated. A model of fast response is established based on pulse width modulation technology, and the simulation analysis is completed. The simulation results show that the response speed of magnetically controll...

2015
Konstantin Kozlov Vitaly Gursky Arina Dymova Ivan Kulakovskiy Maria Samsonova

Table S1: PWM for Hb # A C G T 1 0.28286611155278 0.592185569462781 -0.136145867625823 -1.76751293532056 2 0.254213296764319 -0.279058161264544 0.435320237208231 -0.718027195298608 3 -3.04079579883957 0.805679778784623 -0.405565047598881 0.250334015567387 4 1.15434963541116 -2.77466891653729 -1.26870528382949 -2.98624111976211 5 1.18718322170129 -2.77466891653729 -2.77466891653729 -2.2434402482...

2010
W. Shi S. Malinovskaya

We show that a single femtosecond optical frequency comb may be used to induce two-photon transitions between molecular vibrational levels to form ultracold molecules (e.g., KRb). The phase across an individual pulse in the pulse train is sinusoidally modulated with a carefully chosen modulation amplitude and frequency. Piecewise adiabatic population transfer is fulfilled to the final state by ...

2013
K. Benamrane T. Abdelkrim

This paper presents a comparison between two Pulse Width Modulation (PWM) algorithms applied to a three-level Neutral Point Clamped (NPC) Voltage Source Inverter (VSI). The first algorithm applied is the triangular-sinusoidal strategy; the second is the Space Vector Pulse Width Modulation (SVPWM) strategy. In the first part, we present a topology of three-level NCP VSI. After that, we develop t...

This paper proposes a single-phase five-level inverter with a modified pulse width-modulated (PWM)control scheme. The modified pulse width-modulation technique is developed to reduce switching loss.Also, the proposed multilevel inverter can reduce the requirement of power switches compared to aconventional cascaded multilevel inverter. The modes of operation, control signals, and operatingprinc...

Journal: :Int. J. Communication Systems 2000
Zabih Ghassemlooy A. R. Hayes

This paper presents a brief review of infrared communications systems, modulation techniques and in particular, a digital pulse modulation scheme known as digital pulse interval modulation (DPIM) for infrared (IR) communication systems employing intensity modulation with direct detection (IM/DD). DPIM code characteristics, power spectral density and error probability in terms of the packet erro...

2012
Risanuri Hidayat

BER analysis of Impulse Radio Ultra Wideband (IRUWB) pulse modulations over S-V channel model is proposed in this paper. The UWB pulse is Gaussian monocycle pulse modulated using Pulse Amplitude Modulation (PAM) and Pulse Position Modulation (PPM). The channel model is generated from a modified S-V model. Bit-error rate (BER) is measured over several of bit rates. The result shows that all modu...

2013
B. Bezza

This paper presents a comparison between two Pulse Width Modulation (PWM) algorithms applied to a three-level Neutral Point Clamped (NPC) Voltage Source Inverter (VSI). The first algorithm applied is the triangular-sinusoidal strategy; the second is the Space Vector Pulse Width Modulation (SVPWM) strategy. In the first part, we present a topology of three-level NCP VSI. After that, we develop t...

2004
Mark Lowry Corey Bennett

Most of the experiments planned for LCLS will require accurate measurements of xray pulse temporal history, including pulse shape and relative timing with optical lasers. These requirements are particularly daunting given the recent demands for shorter pulse-widths (< 50 fs), some of which are discussed at the LCLS workshop[1]. This LOI addresses a novel approach to these measurements. There ar...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی برق 1386

بیشترین تعداد مورد استفاده در حال حاضر از ماشینهای چند فاز، ماشین القایی فاز شکسته (spim) می باشد. spim دارای دو مجموعه سیم پیچی استاتور سه فاز می باشد که با هم از نظر الکتریکی 30 درجه اختلاف فاز دارند. عیب اصلی spim وجود جریانهای هارمونیکی هستند که در تولید شار فاصله هوایی نقشی ندارند و فقط در استاتور ماشین می چرخند. به منظور بدست آوردن پاسخ سریع گشتاور ابتدا روش کنترل مستقیم گشتاور (dtc) بر ا...

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