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Träfflista för sökning "WFRF:(Nakamura R.) "

Sökning: WFRF:(Nakamura R.)

  • Resultat 1-10 av 931
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1.
  • Aad, G., et al. (författare)
  • 2011
  • swepub:Mat__t (refereegranskat)
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  • ÖZEN, MUSTAFA, 1984, et al. (författare)
  • Continuous Class-E Power Amplifier Modes
  • 2012
  • Ingår i: IEEE Transactions on Circuits and Systems II: Express Briefs. - 1549-7747 .- 1558-3791. ; 59:11, s. 731-735
  • Tidskriftsartikel (refereegranskat)abstract
    • In this brief, a continuum of novel closed-form solutions is derived for class-E power amplifiers (PAs). It is analytically proven that the class-E zero voltage/zero voltage derivative switching conditions can be satisfied for an arbitrarily selected reactive second harmonic switch impedance (Z 2 S ). The higher order harmonic currents are terminated capacitively. The conventional class-E, class- E/F 2 , and class-EF 2 modes are thus subsets of the continuum. The arbitrary selection of Z 2 S enables robust waveform engineering for performance optimization in specific applications. Furthermore, the theoretical derivation provides important possibilities for wideband class-E PA synthesis. © 2004-2012 IEEE.
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  • Özgünoglu, Mehmet, 1989, et al. (författare)
  • Numerical Assessment of Cavitation Erosion for a Nozzle Flow Configuration
  • 2021
  • Ingår i: 11th International Symposium on Cavitation (CAV2021).
  • Konferensbidrag (refereegranskat)abstract
    • The main purpose of this study is to numerically investigate and predict the cavitation erosion mechanisms in a nozzle flow configuration. To do this, an injector type geometry is numerically investigated with the open-source CFD package OpenFOAM. A compressible Euler approached is applied for two operating conditions, where results are compared with other studies from the literature. Spectral statistics and maximum surface pressure results are compared with experiments. Results show that the proposed modelling approach is capable to explain main cavitation structures that promotes erosion.
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  • Özgün, Imre (författare)
  • Learning by negotiation - Stake and salience in implementing a journal management system
  • 2015
  • Konferensbidrag (refereegranskat)abstract
    • This research investigates how an international academic journal implements a new journal management system to overcome their knowledge management issues. By adopting a case study approach, the stakeholders involved within the project are identified and their salience for the organisation is mapped. By providing an account of how these stakeholders negotiated each other, the case highlights how these negotiations are learning processes, showing that learning process is not a conflict-free process. The case also shows that the stakeholder salience changes throughout the project, thus raising the importance of viewing these negotiations as learning platforms rather than just arenas of power struggles, and to use them as opportunities to identify possible future stakeholders
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  • Özgümüs, Türküler, et al. (författare)
  • Starvation to Glucose Reprograms Development of Neurovascular Unit in Embryonic Retinal Cells
  • 2021
  • Ingår i: Frontiers in Cell and Developmental Biology. - : Frontiers Media SA. - 2296-634X. ; 9, s. 1-11
  • Tidskriftsartikel (refereegranskat)abstract
    • Perinatal exposure to starvation is a risk factor for development of severe retinopathy in adult patients with diabetes. However, the underlying mechanisms are not completely understood. In the present study, we shed light on molecular consequences of exposure to short-time glucose starvation on the transcriptome profile of mouse embryonic retinal cells. We found a profound downregulation of genes regulating development of retinal neurons, which was accompanied by reduced expression of genes encoding for glycolytic enzymes and glutamatergic signaling. At the same time, glial and vascular markers were upregulated, mimicking the diabetes-associated increase of angiogenesis-a hallmark of pathogenic features in diabetic retinopathy. Energy deprivation as a consequence of starvation to glucose seems to be compensated by upregulation of genes involved in fatty acid elongation. Results from the present study demonstrate that short-term glucose deprivation during early fetal life differentially alters expression of metabolism- and function-related genes and could have detrimental and lasting effects on gene expression in the retinal neurons, glial cells, and vascular elements and thus potentially disrupting gene regulatory networks essential for the formation of the retinal neurovascular unit. Abnormal developmental programming during retinogenesis may serve as a trigger of reactive gliosis, accelerated neurodegeneration, and increased vascularization, which may promote development of severe retinopathy in patients with diabetes later in life.
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