Surging from the ontopoietic vital timing of life, human self-consciousness prompts the innermost desire to rise above its brute facts. Imaginatio creatrix inspires us to fabulate these facts into ...events and plots with personal significance attempting to delineate a life-course in life-stories within the ever-flowing stream – existence. Seeking their deep motivations, causes and concatenations, we fabulate relatively stabilized networks of interconnecting meaning – history. But to understand the meaning and sense of these networks’ reconfigurations call for the purpose and telos of our endless undertaking, they remain always incomplete, carried onwards with the current of life, while fluctuating with personal experience in the play of memory. Facts and life stories, subjective desires and propensities, the circumambient world in its historical moves, creative logos and mythos, personal freedom and inward stirrings thrown in an enigmatic interplay, prompt our imperative thirst for the meaning of this course, its purpose and its fulfillment – the sense of it all. To disentangle all this animates the passions of the literary genius. The focus of this collection is to isolate the main arteries running through the intermingled forces prompting our quest to endow life with meaning. Papers by: Jadwiga Smith, Lawrence Kimmel, Alira Ashvo-Munoz, William D. Melaney, Imafedia Okhamafe, Michel Dion, Franck Dalmas, Ludmila Molodkina, Victor Gerald Rivas, Rebecca M. Painter, Matti Itkonen, Raymond J. Wilson III, Christopher S. Schreiner, Bruce Ross, Bernadette Prochaska, Tsung-I Dow, Jerre Collins, Cezary Jozef Olbromski, Victor Kocay, Roberto Verolini
The theoretical advantage of InterCell transformers over separate inductors is demonstrated in an interleaved power converter. Different practical ways to build InterCell transformers are described. ...A theoretical approach dedicated to interleaved converters and InterCell Transformers analysis is presented. This analysis tool is used to understand and overcome the main drawback of InterCell transformers. It is shown how the phase shifts between two adjacent phases must be modified to reduce the maximum flux density that influences core sizing and core losses.
The recent COVID-19 pandemic has propelled the field of aerosol science to the forefront, particularly the central role of virus-laden respiratory droplets and aerosols. The pandemic has also ...highlighted the critical need, and value for,
(that inform policymakers to develop public health responses)
(that inform the public and health care providers how individuals develop respiratory infections). Here, we review existing data and models of generation of respiratory droplets and aerosols, their exhalation and inhalation, and the fate of infectious droplet transport and deposition throughout the respiratory tract. We then articulate how aerosol transport modeling can serve as a bridge between and guide calibration of within-host and epidemiological models, forming a comprehensive tool to formulate and test hypotheses about respiratory tract exposure and infection within and between individuals.
This paper proposes a converter topology dedicated to the interconnection between low voltage and high voltage networks or power sources. This topology uses the interleaving principle whose ...advantages are well known at this point. Its originality stems from the implementation of an isolating intercell transformer (ICT) that provides isolation, filtering, and intercell coupling through a single magnetic stage. The first section of this paper presents two ways to build bidirectional multicell converters, based on classic buck (or boost) cells on one hand, and buck-boost cells on the other. From the nonisolated versions of these two families, the synthesis of isolated versions is achieved by introducing classic two-winding coupled-inductors or transformers. A nonbidirectional isolated ICT version derived from the buck-boost family, the multicell ICT flyback converter, has already been studied and tested. Therefore, the second section describes the isolated multicell ICT converter derived from the buck (or boost) family and constitutes the main contribution of this paper. Its very interesting features regarding high step-up ratio requirements are emphasized, particularly by considering some limitations of the ICT flyback converter. Finally, a 10-kW test bench is presented. This test bench includes eight cells and an ICT created with separated transformers, making it possible to validate converter operations under realistic power conditions.
Multicell converters were introduced ten years ago and, over this period, their properties have been thoroughly analyzed. Since then, this concept has lead to some other innovative topologies which ...are briefly presented in this paper. Different ways to introduce soft switching in multicell converters are investigated. The concept of distributing power over several switches, giving more degrees of freedom and using less passive components, is extended further with the stacked multicell topology. Finally, direct AC-AC converters using the multicell approach are described.
The test and the characterization of medium or high-power electronic converters, under nominal operating conditions, are made difficult by the requirement of high-power electrical source and load. In ...addition, the energy lost during the test may be very significant. The opposition method, which consists of an association of two identical converters supplied by the same source, one operating as a generator, the other as a receptor, can be a better way to do these test. Another advantage is the possibility to realize accurate measurements of the different losses in the converters under test. In the first part of this paper, the characteristics of the method concerning loss measurements are compared to those of the electrical or calorimetric methods, then it is shown how it can be applied to different types of power electronic converters, choppers, switched mode power supplies, and pulsewidth modulation inverters. In the second part, different examples of studies conducted by the authors, and using this method, are presented. They have varying goals, from the test of soft-switching inverters to the characterization of integrated gate-commutated thyristor (IGCT) devices mounted into 2-MW choppers.
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