3,435 research outputs found
Thermomagnetic generators with magnetocaloric materials for harvesting low grade waste heat
No full textTo date, there are very few technologies available for the conversion of low-temperature waste heat into electricity. Thermomagnetic generators are one approach proposed more than a century ago. Such devices are based on a cyclic change of magnetization with temperature. This switches a magnetic flux and, according to Faraday’s law, induces a voltage.
Here we give an overview on our research, covering both materials and systems. We demonstrate that guiding the magnetic flux with an appropriate topology of the magnetic circuit improves the performance of thermomagnetic generators by orders of magnitude. Through a combination of experiments and simulations, we show that a pretzel-like topology results in a sign reversal of the magnetic flux. This avoids the drawbacks of previous designs, namely, magnetic stray fields, hysteresis and complex geometries of the thermomagnetic material.
Though magnetocaloric materials had been the first choice also for thermomagnetic generators, they require some different properties, which we illustrate with Ashby plots for materials selection. Experimentally we compare La-Fe-Co-Si and Gd plates in the same thermomagnetic generator. Furthermore, we discuss corrosion and deterioration under cyclic use is a severe problem occurring during operation. To amend this, composite plates using polymer as a matrix have been suggested previously
Design guidelines for efficient thermoelastic harvesting of low-grade waste heat
No full textData publication for the FEM-simulation study entitled "Design guidelines for efficient thermoelastic harvesting of low-grade waste heat" by Bruno Neumann and Sebastian Fähler. The attached archive contains a readme file to explain the structure of the data and where it can be found
The power of thermoelastic harvesting of low-grade waste heat: A question of timing the heat exchange
No full textData publication for the journal article entitled "The power of thermoelastic harvesting of low-grade waste heat: A question of timing"
by Bruno Neumann, Giovanna Jocobi, Ali Izadi, Andreas Henschke and Sebastian Fähler
The power of thermoelastic harvesting of low-grade waste heat: A question of timing the heat exchange
No full textData publication for the journal article entitled "The power of thermoelastic harvesting of low-grade waste heat: A question of timing"
by Bruno Neumann, Giovanna Jocobi, Ali Izadi, Andreas Henschke and Sebastian Fähler
Data Publication: Growth and Martensitic Transformation of Ferromagnetic Co-Cr-Ga-Si Epitaxial Films
No full textRaw data of a paper done by Yuru Ge. The paper title is finally signed as: Growth and Martensitic Transformation of Ferromagnetic Co-Cr-Ga-Si Epitaxial Films. The authors are Yuru Ge, Klara Lünser, Lukas Fink, Fabian Ganss, and Sebastian Fähler. The raw data will be for the first time online published here in Rodare. The raw data order matches the order of the Figures of the so-called final draft which will be together uploaded with the raw data folders
Mechanisms of stress generation and relaxation during pulsed laser deposition of epitaxial Fe-Pd magnetic shape memory alloy films on MgO
No full textMechanical stress generation during epitaxial growth of Fe-Pd thin films on MgO from pulsed laser deposition is a key parameter for the suitability in shape memory applications. By employing in situ substrate curvature measurements, we determine the stress states as a function of film thickness and composition. Depending on composition, different stress states are observed during initial film growth, which can be attributed to different misfits. Compressive stress generation by atomic peening is observed in the later stages of growth. Comparison with ex situ x-ray based strain measurements allows integral and local stress to be distinguished and yields heterogeneities of the stress state between coherent and incoherent regions. In combination with cross-sectional TEM measurements the relevant stress relaxation mechanism is identified to be stress-induced martensite formation with (111) twinning
Episode 35: Alexis Castellanos, Author of “Isla to Island”, and Her Panel Presentation during the Operación Pedro Pan Two-Day Event
No full textIn Part 1 of “Operación Pedro Pan: The Voices and Stories of Cuba’s Child Exodus—A Knights HistoryCast Mini-Series,” the Department of History’s Sebastian Garcia talked with Alexis Castellanos, an author, illustrator, graphic novelist, and a panelist at the esteemed, conspicuous, and powerful “Operación Pedro Pan: Honoring the Cultural, Historical Legacy of Cuba’s Child Exodus” Two-Day Program that Florida Humanities, UCF’s Department of English and Department of Modern Languages and Literatures sponsored (see https://cah.ucf.edu/pedro-pan/ for more details on sponsors and the program in general).
Sebastian structured this specific episode on Alexis Castellanos’ Isla to Island, a wordless graphic novel grounded by her personal family history and the history of Operación Pedro Pan (Operation Peter Pan). By analyzing such a historic event through the medium of fiction, Sebastian argued that this is one of the most unique Knights HistoryCast episodes of all time. Naturally, their conversation expanded to what she talked about during her panel presentation in Panel One, Day 1 of the event that featured “internationally renowned scholars that discussed the political, historical, and cultural legacy of Operación Pedro Pan (1960-1962).” (https://cah.ucf.edu/pedro-pan/)
To purchase Isla to Island (strongly recommend), check out: https://islatoisland.com/.
To find out more about Alexis and her professional work, check out her website at https://alexiscastellanos.com/https://stars.library.ucf.edu/knightshistorycast/1034/thumbnail.jp
"Cronica der Turckey" Sebastian Franck's Translation of the "Tractatus de Moribus, Condicionibus et Nequitia Turcorum" by Georgius de Hungaria
Full text linkThe Tractatus de moribus, condicionibus et nequitia Turcorum is one of the most important first-hand accounts of life in fifteenth-century Turkey known to modern scholarship. It is the work of a Christian former slave of the Turks, writing after his return to the West. Although the author does not name himself, he can be identified as a
Dominican priest, Georgius de Hungaria, who died in Rome in 1502. His Tractatus is conceived as a work of anti-Islamic polemic, yet it contains a surprisingly unbiased appraisal of Turkish customs.
First printed c.1480 when European apprehension in the face of Ottoman expansion was at its height, the Tractatus was reprinted in numerous editions, and was widely used as a
source by other authors. Luther edited the text in 1530, using the positive account of Turkish customs and religious observance as a weapon in his polemic against the Roman
Catholic Church: if heathens could perform such exemplary works, who could fail to doubt the efficacy of works as a means of salvation?
Sebastian Franck in his German translation of the Tractatus went further: replacing Georgius' commentary with his own, he used the text to attack institutional religion as a
whole and to promote his concept of a non-dogmatic, spiritual Church of individuals united with each other only through their union with God -a Church which was not closed to Moslems or members of any other creed. This translation or adaptation, the Cronica der Türckey, marks Franck's decisive break with the Lutheran cause and the beginning of his lonely path as a 'spiritual individualist'. Franck reworked his translation of the Tractatus for his major geographical work, the Weltbuch of 1534.
This thesis concerns itself primarily with Franck's Cronica, providing the first modern critical edition of this text, in a near-diplomatic transcription with an extensive glossary. The thesis also includes transcriptions of the Tractatus; of Türckei, an anonymous translation of the Tractatus, and of relevant additional material from Franck's Weltbuch. None of these texts has been published in full in a modern edition.
In the Introduction Franck's Cronica is compared in detail with the Tractatus, highlighting the changes that occur in translation; the character and the significance of these changes are then discussed. It is established that Franck, whilst being unwilling to reverse any of Georgius' value judgements on Islam and Turkish culture, is highly selective in his choice of material for translation, and frequently gives the text new nuances and adds his own
comment. The question of the Tractatus' influence on Franck's further development as a writer and thinker is also raised.
The investigation then turns to Franck's use of the Tractatus material in his Weltbuch. His eclecticism becomes apparent in this text, in which Georgius' account is juxtaposed - but not synthesised - with material from other sources, often of lesser veracity and greater anti-Islamic bias. Franck's distortion of the Tractatus material to suit his own line of argument is clearly discernible: from the unique phenomenon presented in the Tractatus the Turks
become one more example of the general human tendency to externalise and dogmatise faith.
In addition, the transmission of Cronica and Türckei is examined, and the relationship between these two translations is clarified: Franck certainly used Türckei in writing his Cronica, but is unlikely to be the author of the anonymous work
2. A Human Being to Be Remembered | The 2024 UCF VLP Podcast Series
No full textIn Episode Two, Andrew Carroll’s herculean efforts to seek and collect over 210,000 war letters—that span since the American Revolution—demonstrate how others are as seriously committed to preserving the legacies of the men and women who served and fought for their country. Andrew shares several letters from his impressive collection, allowing us to be as close as possible to the Veterans—engaging with their own words, thoughts, and emotions. Indeed, themes central to UCF VLP are often exemplified in the 210,000 war letters Andrew has preserved for over twenty-five years.
Andrew Carroll is an award-winning historian and author and is the founder and director of the Center for American War Letters at Chapman University. Andrew was the second keynote speaker invited to share his extraordinary work during the 2024 UCF VLP Institute.
This episode was directed, produced, written, edited, and hosted by Sebastian Garcia and featured Andrew Carroll.
Executive Producers: Sebastian Garcia and Dr. Amelia Lyons.
Music: “Honor and Glory” and “Real Heroes” by SergePavkinMusic (Pixabay)
Podcast Cover Artwork: Sebastian Garcia
The 2024 UCF VLP Podcast Series is brought to you by the UCF History Department Podcast Network and UCF’s Veterans Legacy Program—a partnership with the U.S. Department of Veterans Affairs’ National Cemetery Administration.https://stars.library.ucf.edu/knightshistorycast/1051/thumbnail.jp
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