Academic literature on the topic 'Class-D'

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Journal articles on the topic "Class-D"

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Morishima, Morito. "Class D amplifier." Journal of the Acoustical Society of America 126, no. 5 (2009): 2830. http://dx.doi.org/10.1121/1.3262539.

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Morishima, Morito. "Class D amplifier." Journal of the Acoustical Society of America 127, no. 3 (2010): 1704. http://dx.doi.org/10.1121/1.3359223.

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Chen, Ming-Hsiung. "Class D Amplifier." Journal of the Acoustical Society of America 130, no. 5 (2011): 3174. http://dx.doi.org/10.1121/1.3662352.

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Mikotajewski, M. "Class D synchronous rectifiers." IEEE Transactions on Circuits and Systems 38, no. 7 (July 1991): 694–97. http://dx.doi.org/10.1109/31.135741.

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Fanori, Luca, and Pietro Andreani. "Class-D CMOS Oscillators." IEEE Journal of Solid-State Circuits 48, no. 12 (December 2013): 3105–19. http://dx.doi.org/10.1109/jssc.2013.2271531.

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Kim, Young-Woong, Jong-Gyun Lim, Won-Shil Kang, and Hyun-Chul Ku. "Design of Current-Mode Class-D 900 MHz RF Power Amplifier Using Inverse Class-F Technology." Journal of Korean Institute of Electromagnetic Engineering and Science 22, no. 12 (December 31, 2011): 1060–68. http://dx.doi.org/10.5515/kjkiees.2011.22.12.1060.

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Husar, B., V. Kovalyshyn, V. Marych, R. Lozynskyi, and P. Pastukhov. "COMBINED EXTINGUISHING OF CLASS D, CLASS A AND CLASS B FIRES." Fire Safety 35 (February 26, 2020): 30–34. http://dx.doi.org/10.32447/20786662.35.2019.05.

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The scope of magnesium and aluminium and their alloys in industry, construction and life are expanding over time. As a rule, there are no clean fires of class D, which include combustion of magnesium, aluminium and their alloys. The problem is that the temperature of combustion of magnesium and its alloys can rise above 2800 Celsius degree. Magnesium burns even in the atmosphere of nitrogen and carbon dioxide and such fire is very difficult to extinguish. When water contacts the magnesium or other light metals, the area of fire expands. The main purpose of this work is to study the combined extinguishing of light metals fires, Class A fires and class B fires with a special dry chemical powder and high resistance foaming agent. The problem of extinguishing fires at objects with the using of light metals (magnesium, aluminium) and their alloys has been explored. Class D fires usually lead to class A and class B fires. They occur at high temperatures, and may cause explosions. Scenarios for the development of fires can be as follows: burning of light metals or solid combustible materials ad initium and light metal fire that requires combined extinguishing methods afterwards. Dry chemical powder formulation for extinguishing class A, B, D and and electrical installations under voltage, which includes: sodium chloride, blast furnace slag, ammophos, aerosol has been developed. Testing of this powder has been carried out in the laboratory using chips of magnesium and aluminium alloys. The combustion area in all experiments has been equal to 2.85 × 10-2 sq. m. The quality of the powder has been evaluated by the intensity of the D class fire and the extinguishing time of the B class fier. Dry chemical powder KM-2 has been tested for extinguishing fires 21B, 1A. and for magnesium alloy chips fires. Combined extinguishing tests were conducted on class D, class A and class B fires in field conditions. Method of combined extinguishing with the dry chemical powder followed by covering the entire burning area with high-expansion foam has been proposed (the fire with total area of 2.5 square meters has been extinguished for 45 s). Extinguishing methods have been tested on model fires. Safety measures for light metal extinguishing have been developed. Conclusions: formulation for universal KM 2 dry chemical powder for extinguishing class D, A, B fires, which consists of sodium chloride, ammophos, slag, aerosil, has been developed. Successful extinguishing of class D and B fires has been carried out succesfully; technology of combined fire fighting D and A has been substantiated.
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Antunes, Nuno, and Jed Fisher. "Acquired Class D β-Lactamases." Antibiotics 3, no. 3 (August 21, 2014): 398–434. http://dx.doi.org/10.3390/antibiotics3030398.

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Killion, Mead C. "Class D hearing aid amplifier." Journal of the Acoustical Society of America 81, no. 1 (January 1987): 207–8. http://dx.doi.org/10.1121/1.395007.

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Killion, Mead C. "Class D hearing aid amplifier." Journal of the Acoustical Society of America 83, no. 5 (May 1988): 1991. http://dx.doi.org/10.1121/1.396469.

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Dissertations / Theses on the topic "Class-D"

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Caballero, Angel A. 1981. "A class-D-tracking-rail class-A audio power amplifier." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28384.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.
Includes bibliographical references (p. 63-64).
A tracking-rail power audio amplifier was designed and partially implemented to deliver up to 100W into an 8Q load with very low signal distortion and high power efficiency. The design uses a class-A amplifier, known for its low signal distortion but low power efficiency (less than 50%), to amplify the audio signal. Class-D amplifiers, known for their high power efficiency (greater than 85%) but high signal distortion, provide a signal output that will serve as the supply voltages of the output stage of the class-A amplifier. Thus, the rails will track the audio signal, highly increasing the power efficiency of the Class-A amplifier. This amplifier can achieve a theoretical efficiency of 80%, but, in practice, it is closer to 70%.
by Angel A. Caballero.
M.Eng.
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Hall, Fenella T. H. "Mathematical models for class-D amplifiers." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11891/.

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We here analyse a number of class-D amplifier topologies. Class-D amplifiers operate by converting an audio input signal into a high-frequency square wave output, whose lower-frequency components can accurately reproduce the input. Their high power efficiency and potential for low distortion makes them suitable for use in a wide variety of electronic devices. By calculating the outputs from a classical class-D design implementing different sampling schemes we demonstrate that a more recent method, called the Fourier transform/Poisson resummation method, has many advantages over the double Fourier series method, which is the traditional technique employed for this analysis. We thereby show that when natural sampling is used the input signal is reproduced exactly in the low-frequency part of the output, with no distortion. Although this is a known result, our calculations present the method and notation that we later develop. The classical class-D design is prone to noise, and therefore negative feedback is often included in the circuit. Subsequently we incorporate the Fourier transform/Poisson resummation method into a formalised and succinct analysis of a first-order negative feedback amplifier. Using perturbation expansions we derive the audio-frequency part of the output, demonstrating that negative feedback introduces undesirable distortion. Here we reveal the next order terms in the output compared with previous work, giving further insight into the nonlinear distortion. We then further extend the analysis to examine two more complex negative feedback topologies, namely a second-order and a derivative negative feedback design. Modelling each of these amplifiers presents an increased challenge due to the differences in their respective circuit designs, and in addition, for the derivative negative feedback amplifier we must consider scaling regimes based on the relative magnitudes of the frequencies involved. For both designs we establish novel expressions for the output, including the most significant distortion terms.
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Burrow, Stephen George. "Low power, high efficiency Class D amplifiers." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271779.

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Goodfellow, John Kevin. "D-class amplifiers for current waveform generation." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/7266.

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Pettersson, Robin, and Sahag Normanian. "Low-Consuming Class D Amplifier For Rough Environments." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12272.

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Quibell, Jason. "Digital control of a Class-D Audio Amplifier." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/1116.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2011
Modern technologies have led to extensive digital music reproduction and distribution. It is fitting then that digital audio be amplified directly from its source rather than being converted to an analogue waveform before amplification. The benefits of using a digital controller for audio processing include being able to easily reconfigure the system and to add additional functions at a later stage.Digital audio is primarily stored as Pulse Code Modulation (PCM) while Pulse Width Modulation (PWM) is the most popular scheme used to drive a class-D amplifier. The class-D amplifier is selected in many applications due to its very high energy efficiency. Conventional PCM to PWM conversion is inherently nonlinear. Various interpolation schemes are presented in this research project which help to address the nonlinearity.Digitally generated PWM has a limited resolution which is constrained by the system clock. This thesis presents noise shaping techniques which increase the effective resolution of the PWM process without having to use an excessively high system clock. Noise shaping allows a low resolution modulator to be used to reproduce high resolution audio.
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Kong, Youxin. "Structural studies of Class A and D plexins." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:e5e4aa99-e348-4dd9-97a8-bc5825c79a69.

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Semaphorin signalling via the plexin receptors, important in the nervous, cardiovascular, immune and skeletal systems, requires cytoplasmic domain dimerisation but its extracellular regulation and activation mechanisms remain unclear. In the thesis I conducted structural characterisation for two particular classes of verterbrate plexins, PlxnAs and PlxnD1. Here I present crystal structures of PlxnA1, PlxnA2 and PlxnA4 full ectodomains. The first nine domains of PlxnAs forma 230 Å long ring-like stalk fromwhich the tenth C-terminal domain points away. In agreement, negative stain electron microscopy of the PlxnA1 ectodomain reveals a predominant ring-like conformation and a minor twisted-open conformation of the stalk. All PlxnA crystal structures also make intermolecular "head-to-stalk" (domain 1 to domain 4-5) interactions, which are confirmed by structure-guided biophysical assays and live cell fluorescence microscopy. Functional assays performed in COS-7 cell and dentate gyrus growth cones revealed an autoinhibitory mechanism for PlxnAs based on this head-to-stalk interface. My results reveal a two-fold role for the PlxnA ectodomains: imposing a presignalling autoinhibitory separation of the PlxnA membrane proximal domains via a head-to-stalk, intermolecular interaction and supporting PlxnA cytoplasmic domain dimerisation post semaphorin-binding. For PlxnD1, I present high-resolution crystal structures of its semaphorinbinding segment (domains 1-2) as well as an initial structural model of its complete ectodomain (domains 1-10). The sema (domain 1) of PlxnD1 has the classic fold of a plexin sema domain as well as distinct insertions potentially important for its ligand-binding specificity. The PlxnD1 ectodomain adopts a closed-ring conformation in its crystal structure, in which the tail (domain 9) interacts with the sema domain head. In-solution experiments suggest structural variability and potential weak oligomerization for the PlxnD1 ectodomain. These new structures shed light on the unique and previously uncharacterised structural basis for PlxnD1 signalling.
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BURRA, RAVIKANTH. "DESIGN METHODOLOGIES OF CLASS D AUDIO SWITCHING AMPLIFIERS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1123767048.

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Stark, Stefan. "Direct Digital Pulse Width Modulation for Class D Amplifiers." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8476.

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Class D amplifiers are becoming increasingly popular in audio devices. The strongest reason is the high efficiency which makes it advantageous for portable battery-driven products.

Infineon Technologies is developing products in this area, and has recently filed a patent application regarding an implementation of a part of the class D amplifier. The aim of this Master’s thesis is to evaluate a digital open-loop implementation of a class D amplifier, using the pending patent solution, and discuss the differences from an analog closed-loop implementation.

The focus has been on generating a high resolution PWM signal with a relatively low clock frequency. To achieve this, a hybrid of a counter and a self-calibrating tapped delay-line are used as a pulse generator. A model of the pulse generator was developed which made it possible to study how sampling frequency and different types of quantization affected quality parameters such as THD and SNR. With the results from the model two systems were implemented and simulated in HDL and as circuit schematics.

The proposed digital open-loop class D amplifier was found to be useful in voice-band applications and for music. Since the open-loop structure suffers from poor rejection of power supply ripple, either error correction or a regulated power supply is needed. If much effort is put on the different parts of the amplifier the result can be really good but, depending on other constraints on the system, it may be simpler and less time consuming to use the analog circuit with feedback to achieve hi-fi quality.

In summary, the combination of a counter and a self-calibrating tapped delay-line as a pulse generator is very useful in high resolution low-power systems. To avoid errors the delay-line and calibration can be made very accurate but with the expense of higher power consumption and area. However, the technique benefits from the small and fast logic devices available in deep sub-micron process technologies, which may finally lead to an advantage in power consumption and cost over the closed-loop analog solution.

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Jacobs, Deon. "Digital pulse width modulation for Class-D audio amplifiers." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1574.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
Digital audio data storage mediums have long been used within the consumer market. Today, because of the advancement of processor clock speeds and increased MOSFET switching capabilities, digital audio data formats can be directly amplified using power electronic inverters. These amplifiers known as Class-D have an advantage over there analogue counterparts because of their high efficiency. This thesis deals with the signal processing algorithms necessary to convert the digital audio data obtained from the source to a digital pulse width modulated signal which controls a full bridge inverter for audio amplification. These algorithms address difficulties experienced in the past which prevented high fidelity digital pulse width modulators to be implemented. The signal processing algorithms are divided into modular blocks, each of which are defined in theory, designed and simulated in Matlab® and then implemented within VHDL firmware. These firmware blocks are then used to realize a Class-D audio amplifier.
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Books on the topic "Class-D"

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Division, Library of Congress Subject Cataloging. Class D, history: General and old world. 2nd ed. Detroit, Mich: Gale Research Co., 1987.

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Classification. Class D. Subclass DS. History of Asia. 3rd ed. Washington: Library of Congress, 1987.

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Classification. Class D. Subclasses D-DJ. History (general). History of Europe, part 1. 3rd ed. Washington: Library of Congress, 1990.

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Classification. Class D. Subclasses DL-DR. History of Europe, part 2. 3rd ed. Washington: Library of Congress, 1990.

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Classification. Class D. Subclasses DT-DX. History of Africa, Australia, New Zealand, etc. 3rd ed. Washington: Library of Congress, 1989.

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Popielarz, Edward D. Guardian of your soul: A class in acceptance : notes of Edward D. Popielarz. Boca Raton, Fla: Jeremiah Press, 1997.

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Classification. Class D. Subclasses DJK-DK. History of Eastern Europe (general), Soviet Union, Poland. 3rd ed. Washington: Library of Congress, 1987.

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Practices, LLC Best. Incorporating biomarker research for R&D success: Access and intelligence for achieving world-class excellence. Chapel Hill, NC: Best Practices, LLC, 2004.

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Pereira, Nuno, and Nuno Paulino. Design and Implementation of Sigma Delta Modulators (ΣΔM) for Class D Audio Amplifiers using Differential Pairs. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-11638-9.

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Varona, Salazar Jorge. A low-voltage fully-monolithic delta-sigma based class-D audio amplifier in 0.18[mu]m CMOS. Ottawa: National Library of Canada, 2002.

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Book chapters on the topic "Class-D"

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Danel, Franck, Malcolm G. P. Page, and David M. Livermore. "Class D β-Lactamases." In Enzyme-Mediated Resistance to Antibiotics, 163–94. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815615.ch11.

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Sedighi, Art, and Milton Smith. "Class D Results and Simulations." In Fair Scheduling in High Performance Computing Environments, 111–22. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14568-2_13.

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Piessens, Tim, and Michiel Steyaert. "Class D Self-Oscillating Line Drivers." In Analog Circuit Design, 309–31. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/0-306-48707-1_15.

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Ballan, Hussein, and Michel Declercq. "12V Delta-Sigma Class-D Audio Amplifier." In High Voltage Devices and Circuits in Standard CMOS Technologies, 227–66. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4757-5404-9_7.

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McCloy-Stevens, Mark, Toru Ido, Hamed Sadati, Yu Tamura, and Paul Lesso. "A Deep Sub-micron Class D Amplifier." In Low-Power Analog Techniques, Sensors for Mobile Devices, and Energy Efficient Amplifiers, 339–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97870-3_16.

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Robič, Borut. "The Class $$ \mathcal{D} $$ of Degrees of Unsolvability." In The Foundations of Computability Theory, 255–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44808-3_13.

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Robič, Borut. "The Class $$ \mathcal{D} $$ of Degrees of Unsolvability." In The Foundations of Computability Theory, 273–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-62421-0_13.

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Zhao, Fei, Yong Xu, Cheng Hu, Yuanliang Wu, and Limei Ma. "Key Techniques of Class D Audio Power Amplifier." In Recent Advances in Computer Science and Information Engineering, 605–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25792-6_92.

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Pereira, Nuno, and Nuno Paulino. "Class D Audio Amplifiers and Data Conversion Fundamentals." In SpringerBriefs in Electrical and Computer Engineering, 5–24. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11638-9_2.

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Moreno-Díaz, Arminda, Gabriel de Blasio, and Roberto Moreno-Díaz. "A Class of 3-D Distributed Modular Computing Nets." In Computer Aided Systems Theory – EUROCAST 2015, 103–9. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-27340-2_14.

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Conference papers on the topic "Class-D"

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Kiri, Akito, Kouta Ohara, Yoshihiro Tomita, Seiji Shukuri, Takeshi Yasukouchi, and Tadashi Suetsugu. "Class D and class E selectable power amplifier." In INTELEC 2009 - 2009 International Telecommunications Energy Conference. IEEE, 2009. http://dx.doi.org/10.1109/intlec.2009.5351909.

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Balmelli, Pio, John Khoury, Eduardo Viegas, Paulo Santos, and Vitor Pereira. "Linearization of class D amplifiers." In 2012 IEEE Custom Integrated Circuits Conference - CICC 2012. IEEE, 2012. http://dx.doi.org/10.1109/cicc.2012.6330567.

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Ginzburg, N. S., E. R. Kocharovskaya, and A. S. Sergeev. "Class D lasers vs. class B lasers: Dynamical spectra analysis." In 2013 IEEE 12th International Conference on Laser and Fiber-Optical Networks Modeling (LFNM). IEEE, 2013. http://dx.doi.org/10.1109/lfnm.2013.6644821.

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Zhang, Peikun, and ZhiGuo Lu. "Dynamic behavior of class D lasers." In OE/LASE '94, edited by Vern N. Smiley and Frank K. Tittel. SPIE, 1994. http://dx.doi.org/10.1117/12.176656.

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Edelmoser and Himmelstoss. "High Dynamic Class-D Power Amplifier." In 1998 International Conference on Consumer Electronics. IEEE, 1997. http://dx.doi.org/10.1109/icce.1997.625974.

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Mendenhall, Eric. "Class D Amplifier with Ripple Steering." In PEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition. IEEE, 2007. http://dx.doi.org/10.1109/apex.2007.357745.

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Raab, F. H. "Frequency-agile class-D power amplifier." In Ninth International Conference on HF Radio Systems and Techniques. IEE, 2003. http://dx.doi.org/10.1049/cp:20030434.

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Randall, Robert C., and David Brown. "Velocity control with class D amplifiers." In ICA 2013 Montreal. ASA, 2013. http://dx.doi.org/10.1121/1.4799161.

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Kang, Yang, Tong Ge, Huiqiao He, and Joseph S. Chang. "A review of audio Class D amplifiers." In 2016 International Symposium on Integrated Circuits (ISIC). IEEE, 2016. http://dx.doi.org/10.1109/isicir.2016.7829693.

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Berkhout, Marco. "Class-D audio amplifiers in mobile applications." In 2009 IEEE International Symposium on Circuits and Systems - ISCAS 2009. IEEE, 2009. http://dx.doi.org/10.1109/iscas.2009.5117969.

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Reports on the topic "Class-D"

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Nielsen, R. J. Noise Generation in Class A-D Amplifiers. Fort Belvoir, VA: Defense Technical Information Center, August 1988. http://dx.doi.org/10.21236/ada203259.

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Author, Not Given. The CALS Test Network MIL-D-28000 Class II reference drawing packet: Revision C. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6187929.

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Author, Not Given. Engineering drawing transfer test with Douglas Aircraft Company: MIL-D-28000 Class II (IGES). Office of Scientific and Technical Information (OSTI), May 1989. http://dx.doi.org/10.2172/6032847.

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Fish, L. W. Greater-than-Class C low-level radioactive waste characterization. Appendix D-3: Characterization of greater-than-Class C low-level radioactive waste from other generators. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/132664.

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Bonzon, L., D. Hente, B. Kukreti, J. Schendel, J. Tulk, W. Janis, D. Black, G. Paulsen, and B. Aucoin. Test Series 3: seismic-fragility tests of naturally-aged Class 1E C and D LCU-13 battery cells. Office of Scientific and Technical Information (OSTI), March 1985. http://dx.doi.org/10.2172/5533663.

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Broidy, Frank, Ralph Clayton, Brandon Troc, and Joseph Mirabal. Development of a Nitrogen and Magnesium Oxide based Class A, B & D Suffocating Fire System (SFSS) for Gloveboxes. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1773318.

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LAWRENCE LIVERMORE NATIONAL LAB CA. Technical Publication Transfer Test with Texas Instruments: MIL-M-28001 (SGML) and MIL-D-28000 Class I (IGES): Quick Short Test Report. Fort Belvoir, VA: Defense Technical Information Center, September 1990. http://dx.doi.org/10.21236/ada267878.

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CALIFORNIA UNIV LIVERMORE RADIATION LAB. Technical Publication Transfer Test with Pratt and Whitney: MIL-M-2800O1 (SGML) and MIL-D-28000 Class I (IGES). Quick Short Test Report. Fort Belvoir, VA: Defense Technical Information Center, February 1990. http://dx.doi.org/10.21236/ada313481.

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Annette Schafer, Arthur S. Rood, and A. Jeffrey Sondrup. Explanation of Significant Differences Between Models used to Assess Groundwater Impacts for the Disposal of Greater-Than-Class C Low-Level Radioactive Waste and Greater-Than-Class C-Like Waste Environmental Impact Statement (DOE/EIS-0375-D) and the. Office of Scientific and Technical Information (OSTI), August 2011. http://dx.doi.org/10.2172/1031698.

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Martínez Álvarez, Silvia, and Ana Lorena De Varela. Aprendamos todos a leer: Fascículo 19: Toda la familia lee y escribe conmigo. Inter-American Development Bank, November 2020. http://dx.doi.org/10.18235/0002990.

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"Aprendamos todos a leer" es la iniciativa para la enseñanza de lectura y escritura inicial del BID, donde a través de materiales para el alumno, el maestro y el aula de clase, pretende brindar herramientas para apoyar el proceso de alfabetización inicial. El programa se organiza a partir de una cartelera fonológica presentando para cada fonema (sonido de letra) un personaje caracterizado por un animal. En respuesta al COVID-19, se desarrollaron fascículos para apoyar el trabajo en casa. Este fascículo contiene orientaciones para enseñar el sonido y escritura de la letra C-c y su combinación con las vocales, especialmente la A-a, E-e, I-i, O-o y U-u y las consonantes M-m, N-n, L-l, S-s, F-f, T-t, B-b y D-d.
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