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Showing 1 to 20 of 26 for “"class D"”.

  1. Characterization of Class D VPS Proteins

    Friedberg, Andrew Seth2010

    … genetics of this system have revealed several classes of mutants, each defective in one transport step in the VPS pathway. The Class D VPS proteins are thought to control anterograde traffic between the late Golgi and late endosome. Although most of these proteins have homologues of known …

    utswmed Repository record

  2. A new mode of Class D amplification

    Cowett, Philip M.Virginia Polytechnic Institute and State University1971

    … a more efficient method of power amplification. Class D operation, in which the output transistors are either cut off or saturated and, hence, dissipate very little power, is one method of satisfying this need. This paper presents a study of a new mode of Class D amplification. In a conventional …

    vt Repository record

  3. Structure and activation of the class D GPCR dimer Ste2

    Velazhahan, VaithishUniversity of Cambridge2022

    … GPCRs are divided phylogenetically into six classes, A-F. Over 700 structures of mammalian GPCRs (classes A, B, C and F) have been determined thus far, which greatly illuminate the structural mechanisms of GPCR-mediated signalling. However, structures were lacking for class D GPCRs, which are …

    cambridge Repository record

  4. A class-D-tracking-rail class-A audio power amplifier

    Caballero, Angel A., 1981-Massachusetts Institute of Technology2004

    … 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 …

    mit Repository record

  5. A Distortion Suppression Technique for a Digital Class D Audio Power Amplifier with Pulse Density Modulation

    McKenzie, Robert Neil2022

    … Interference (EMI) generated. Switching audio Class D amplifiers can provide much better power efficiency than linear Class AB amplifiers due to a low voltage difference between the switching output node and the power supplies. Pulse Width Modulation (PWM) can provide over 100 dB THD at a …

    toronto-retro Repository record

  6. Radiation management, avionics development, and integrated testing of a Class-D space-based asteroid X-ray spectrometer

    Biswas, Pronoy K. (Pronoy Kumar)Massachusetts Institute of Technology2016

    … processor. Although the REXIS instrument is classified as a high-risk Class-D project by NASA, it must safely interface (in the manner of "do no harm") with the low-risk Class-B OSIRIS-REx spacecraft. Furthermore, REXIS must operate in the interplanetary space radiation environment of the …

    mit Repository record

  7. Integration and test of the REgolith X-ray Imaging Spectrometer and recommendations for low-cost, high-risk spaceflight programs

    Bayley, Laura C. (Laura Christine)Massachusetts Institute of Technology2016

    NASA Risk Class D programs must meet their technical goals with limited resources. The Regolith X-Ray Imaging Spectrometer (REXIS) is a Class D student collaboration instrument flying on the NASA OSIRIS-REx mission. This thesis describes and analyzes the NASA management and systems engineering …

    mit Repository record

  8. An Exploratory Study of Pulse Width and Delta Sigma Modulators

    Penrod, Logan B2020

    … self oscillating structure, has seen use in Class D Power Amplifiers, performing a similar function. It has been shown that the PWM in Class D Amplifiers outperforms the DSM [1], but could this advantage be used in DSADC use-cases? LTSpice simulation and printed circuit board implementation …

    calpoly Repository record

  9. Designing an Efficient Power/Control System for a Network of Piezoelectric Speakers

    Tang, Grace W.Massachusetts Institute of Technology2023

    … explored here: a common-emitter paired with a class AB amplifier, and a class D amplifier. Although testing was limited due to an unsuccessful 200V power supply design, the class D amplifier was found to be the more efficient solution with a wider voltage range. However, the class AB amplifier …

    mit Repository record

  10. Acoustic and non-acoustic performance of coal bottom ash as sound absorptive material for reducing railway noise level

    Ramzi Hannan, Nurul Izzati RaihanUniversiti Tun Hussein Onn Malaysia2019

    … 1997, it was found that CBA concrete can be classified as Class D (absorption). Class D materials are able to absorb more than 30% of sound by conducting impedance tube and reverberation time. In addition, the Noise Reduction Coefficient (NRC) performance for CBA concrete addresses more than …

    uthm Repository record

  11. Studies on the mode of action and beta-lactamase inhibitory properties of novel oxapenem compounds

    Jamieson, Conor E.Aston University2002

    … strains, including hyperproducers of class C enzymes and extended-spectrum ß-lactamase enzymes. A fixed 4µg/ml concentration of AM-112 protected a panel of eight cephalosporins against hydrolysis by class A and class C ß-lactamase producers. In vivo studies confirmed the protective …

    aston Repository record

  12. Activation mechanisms of non-class A G protein-coupled receptors

    Bansal, PrateekUniversity of Illinois Urbana-Champaign2025

    … entire body and are one of the most important classes of drug targets. While the majority of the recent literature on GPCRs focuses on Class A GPCRs, the structural and dynamic insights underlying the activation mechanism of non-Class A GPCRs are lacking. This thesis addresses this gap by …

    uiuc Repository record

  13. Piezoelectric Transformer Integration Possibility in High Power Density Applications

    Do, Manh CuongTechnische Universität Dresden

    … minimization of components (passive and active): class D and class E amplifiers. The operational characteristics of these amplifiers with the PT are then comparison. Methods to track the optimum frequency and discontinuous working mode of the PT are proposed as the approaches to improve the energy …

    qucosa-diss

  14. Geophysical assessment of soil and rock in the New Madrid seismic zone

    Eljabri, Faraj MohamedMissouri University of Science and Technology

    … earthquake hazards reduction program (NEHRP) class D was assigned to the site based on MASW and DHS data results. At the Arkansas site, borehole control, electrical resistivity tomography (ERT), seismic refraction tomography (SRT), and multichannel analysis of surface waves (MASW) data were …

    must-thes Repository record

  15. Efficiency improvement in nanometre CMOS outphasing power amplifiers

    Love, MatthewQueen's University Belfast2021

    … voltage-source CMOS PA, the complementary Class-D, suffers from shoot-through current losses where the supply voltage is shorted to ground during switching. The short-circuit can be prevented by driving the two transistors with dead-time-separated voltages to stop them from switching …

    qu-belfast Repository record

  16. Students’ Perceptions And Experiences: African American Students In Band And Orchestra Programs

    Pearson-Bush, Sharese2020

    … (d) student desirability of instrumental music classes, (e) teacher community and cultural consciousness, and (f) student outside perception and influence. Furthermore, qualitative data collected through individual interviews was used to develop a profound understanding of African American …

    une-thes Repository record

  17. Structures of Werner clathrates

    Taylor, Michael WilliamDepartment of Chemistry1989

    … The compounds are divided into four broad classes with the host complex of each as follows: Class A [Ni(NCS)₂(4-PhPy)₄]; Class B [NiCl₂(4-PhPy)₄]; Class c [Ni(NCS)₂(4-MePy)₂(4-PhPy)₂]; Class D [NiX₂(dmso)₂(4-PhPy)₂] where X= Ncs- or Cland [Ni(NCS)₂(4-RPy)₄] where R = 4-t-Bu or 4-Bz. The …

    cape-town Repository record

  18. Geotechnical Properties Of the Travis Peak (Hosston) Formation in East Texas: A Compressive and Tensile Strength Analysis using Regression Analysis.

    Kakarla, Pawan2016

    … values which were calculated, these samples were classified as medium strength rocks which belongs to Class D.</p> <p>Linear Regression analysis was performed using MATLAB software for predicting the strength of core rock samples. The equation for linear regression was in the form of , where y is …

    sfasu Repository record

  19. Inclusion properties of hydroxy host compounds

    Bourne, Susan AnnDepartment of Chemistry1991

    … The inclusion compounds were divided into four classes : Class A consisted of compounds of 1, 1,2,2-tetraphenylethane-1,2-diol, Class B consisted of compounds of triphenylmethanol, Class C consisted of compounds of triphenylsilanol and Class D consisted of compounds of tri-1-naphthylsilanol. A …

    cape-town Repository record

  20. Environmental Flow Determination in Headwater Catchments of Luvuvhu River in Limpopo Province, South Africa

    Gumbo, Anesu Dion2026

    … (referred to as A91CD_out in the thesis) under Class D environmental management class (EMC). Monthly distributions and variations of these flow regimes were generated by the RDRM in the SPATSIM framework. The GEFC model results, when applied with global datasets, produced identical e-flow values …

    venda Repository record

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