Vector product and composition algebras in braided monoidal additive categories

This is an account of some work of Markus Rost and his students Dominik Boos and Susanne Maurer. We adapt it to the braided monoidal setting.Comment: 23 page

Mitos Maskulinitas Pada Tokoh Utama (Analisis Semiotika Roland Barthes Dalam Film Jakarta Vs Everybody)

Using Roland Barthes' semiotic techniques, this research focuses on examining the myth of masculinity in the 2020 film "Jakarta Vs Everybody". By using the critical paradigm and Barthes' semiotic theory to determine denotation, connotation and myth, the approach used is a qualitative descriptive study. The purpose of this research is to examine how Dominik, the main character, represents the myth of masculinity in various film scenes using verbal, visual and nonverbal cues. Research findings show that this film has a latent (invisible) myth of masculinity. As the main character, Dominik is symbolized by a number of symbols that, in addition to spoken words and nonverbal cues, physically depict what it means to be a man. Several myths about masculinity emerged from this research, such as the need to be tough in facing life's challenges, have a positive attitude towards self-development, and be persistent in achieving goals. The results of this research provide a new perspective on the mythical conception of masculinity in Indonesian society, especially in the action drama film genre. This film strengthens previous research findings that show how, semiotically, films can depict social myths. As a result, the film “Jakarta Vs. Everybody” in 2020 makes a positive contribution by displaying the characteristics of the myth of masculinity which can encourage the next generation to endure life's challenges, develop themselves and pursue their dreams

Beautiful destruction: The aesthetic of apocalypse in Hans Dominik's early science fiction

Though the term ‘science fiction’ was coined somewhat later, the early twentieth century saw an enormous rise in an interest in technological tales set in the near future, mirroring a general awareness of the growing importance of science. Hans Dominik was one of the most prolific – and successful – German authors of this kind of popular literature. According to estimates millions of copies of his books have been sold, making Dominik’s work an interesting case study illustrating the sorts of ideas about science that German-speaking audiences entertained. Being a trained engineer and a public relations officer by profession, Dominik drew heavily on scientific topics that were headline news at the time and yet he also managed to create something new on the basis of these. One of the methods he employed was the use of religious motifs and topoi. Dominik magnified the relevance of scientific enterprises and depicted the consequences of science – or scientific misconduct, rather – as the beginning of a catastrophe, or even an apocalypse. By the same token, Dominik often introduced the figure of the scientist as a protagonist who would save the world. Thus Dominik was able to draw the attention of a large audience to concepts of the use of atomic energy or nuclear weapons – to name only two – and their creative or destructive potential, decades before such devices were technically feasible

Rapid planetesimal formation in turbulent circumstellar discs

The initial stages of planet formation in circumstellar gas discs proceed via dust grains that collide and build up larger and larger bodies (Safronov 1969). How this process continues from metre-sized boulders to kilometre-scale planetesimals is a major unsolved problem (Dominik et al. 2007): boulders stick together poorly (Benz 2000), and spiral into the protostar in a few hundred orbits due to a head wind from the slower rotating gas (Weidenschilling 1977). Gravitational collapse of the solid component has been suggested to overcome this barrier (Safronov 1969, Goldreich & Ward 1973, Youdin & Shu 2002). Even low levels of turbulence, however, inhibit sedimentation of solids to a sufficiently dense midplane layer (Weidenschilling & Cuzzi 1993, Dominik et al. 2007), but turbulence must be present to explain observed gas accretion in protostellar discs (Hartmann 1998). Here we report the discovery of efficient gravitational collapse of boulders in locally overdense regions in the midplane. The boulders concentrate initially in transient high pressures in the turbulent gas (Johansen, Klahr, & Henning 2006), and these concentrations are augmented a further order of magnitude by a streaming instability (Youdin & Goodman 2005, Johansen, Henning, & Klahr 2006, Johansen & Youdin 2007) driven by the relative flow of gas and solids. We find that gravitationally bound clusters form with masses comparable to dwarf planets and containing a distribution of boulder sizes. Gravitational collapse happens much faster than radial drift, offering a possible path to planetesimal formation in accreting circumstellar discs.Comment: To appear in Nature (30 August 2007 issue). 18 pages (in referee mode), 3 figures. Supplementary Information can be found at 0708.389

RECENZIJA KNJIGE Marcin Będkowski, Anna Brożek, Alicja Chybińska, Stepan Ivanyk, and Dominik Traczykowski (ur.) FORMAL AND INFORMAL METHODS IN PHILOSOPHY, Brill | Rodopi, 2020

BOOK REVIEW: Marcin Będkowski, Anna Brożek, Alicja Chybińska, Stepan Ivanyk, and Dominik Traczykowski (Eds.), FORMAL AND INFORMAL METHODS IN PHILOSOPHY, Brill | Rodopi, 2020, pp. vii + 320, ISBN-10: 9004420495, ISBN-13: 978-90-04-42050-2, Hardback, €149.00 / $179.00RECENZIJA KNJIGE: Marcin Będkowski, Anna Brożek, Alicja Chybińska, Stepan Ivanyk, and Dominik Traczykowski (Eds.) FORMAL AND INFORMAL METHODS IN PHILOSOPHY, Brill | Rodopi, 2020, str. vii + 320, ISBN-10: 9004420495, ISBN-13: 978-90-04-42050-2, Tvrdi uvez, €149.00 /$179.0

RECENZIJA KNJIGE Marcin Będkowski, Anna Brożek, Alicja Chybińska, Stepan Ivanyk, and Dominik Traczykowski (ur.) FORMAL AND INFORMAL METHODS IN PHILOSOPHY, Brill | Rodopi, 2020

BOOK REVIEW: Marcin Będkowski, Anna Brożek, Alicja Chybińska, Stepan Ivanyk, and Dominik Traczykowski (Eds.), FORMAL AND INFORMAL METHODS IN PHILOSOPHY, Brill | Rodopi, 2020, pp. vii + 320, ISBN-10: 9004420495, ISBN-13: 978-90-04-42050-2, Hardback, €149.00 / $179.00RECENZIJA KNJIGE: Marcin Będkowski, Anna Brożek, Alicja Chybińska, Stepan Ivanyk, and Dominik Traczykowski (Eds.) FORMAL AND INFORMAL METHODS IN PHILOSOPHY, Brill | Rodopi, 2020, str. vii + 320, ISBN-10: 9004420495, ISBN-13: 978-90-04-42050-2, Tvrdi uvez, €149.00 /$179.0

Mediendidaktik zwischen Wissenschaft und Praxis

Rezension zu: Petko, Dominik. 2014. Einführung in die Mediendidaktik: Lehren und Lernen mit digitalen Medien. Bildungswissen Lehramt 25. Weinheim: Beltz

Implications of binary black hole detections on the merger rates of double neutron stars and neutron star-black holes

We show that the inferred merger rate and chirp masses of binary black holes (BBHs) detected by advanced LIGO (aLIGO) can be used to constrain the rate of double neutron star (DNS) and neutron star - black hole (NSBH) mergers in the universe. We explicitly demonstrate this by considering a set of publicly available population synthesis models of \citet{Dominik:2012kk} and show that if all the BBH mergers, GW150914, LVT151012, GW151226, and GW170104, observed by aLIGO arise from isolated binary evolution, the predicted DNS merger rate may be constrained to be $2.3-471.0$~\rate~ and that of NSBH mergers will be constrained to $0.2-48.5$~\rate. The DNS merger rates are not constrained much but the NSBH rates are tightened by a factor of $\sim 4$ as compared to their previous rates. Note that these constrained DNS and NSBH rates are extremely model dependent and are compared to the unconstrained values $2.3-472.5$ \rate~ and $0.2-218$ \rate, respectively, using the same models of \citet{Dominik:2012kk}. These rate estimates may have implications for short Gamma Ray Burst progenitor models assuming they are powered (solely) by DNS or NSBH mergers. While these results are based on a set of open access population synthesis models which may not necessarily be the representative ones, the proposed method is very general and can be applied to any number of models thereby yielding more realistic constraints on the DNS and NSBH merger rates from the inferred BBH merger rate and chirp mass.Comment: 5 pages, no figures, 4 tables, v2: matches published versio