122,104 research outputs found
The fate of binary stars hosting planets upon interaction with Sgr A* black hole
No full textOur Galaxy hosts a very massive object at its centre, often referred to as the supermassive black hole Sgr A*. Its gravitational tidal field is so intense that it can strip apart a binary star passing its vicinity and accelerate one of the components of the binary as hypervelocity star (HVS) and grab the other star as S-star. Taking into consideration that many binary star systems are known to host planets, in this paper we aim to broaden the study of the close interaction of binary stars and their planetary systems with Sgr A* massive object. Results are obtained via a high-precision N-body code including post-Newtonian approximation. We quantify the likelihood of capture and ejection of stars and planets after interaction with Sgr A*, finding that the fraction of stars captured around it is about three times that of the planets (∼49.4 per cent versus ∼14.5 per cent) and the fraction of hypervelocity planet ejection is about twice that of HVSs (∼21.7 per cent versus ∼9.0 per cent). The actual possibility of observational counterparts deserves further investigation
Stability of planetary systems within the S-star cluster: The Solar system analogues
No full textA dynamically relaxed dense cluster comprised of about 40 stars (the so-called S-stars) inhabits the central region of our Galaxy. Their stars revolve around the Sgr A∗ massive object. To understand the dynamical evolution of planetary systems in a particular environment like that around Sgr A∗, we carry out direct N-body simulations of planetary systems embedded in the S-star cluster. In this work, we investigate the short-term stability of the planets orbiting around S-stars after their close interactions with the central massive black hole of our Galaxy. We find that planetary systems go through encounters with the supermassive black hole (SMBH) and the nearby stars. We determine the frequency and the strength of planetary systems' encounters with the nearby stars as these encounters remarkably increase for systems assigned to S-stars closer to the SMBH. The SMBH severely destabilizes the planetary systems, though we noted that the small oscillations in the mutual eccentricity and inclination of the planetary system could be caused by the planet-planet coupling and the near-resonance effect between the two planets. We obtain estimates of the fraction of survivor planets (∼ 51 per cent), and find that planets stripped from their hosting star are generally captured on close orbits around Sgr A∗. We notify while gas giants are tidally disrupted, terrestrial planets do not. We estimate that Sgr A∗ flares can be due to the tidal disruption events of starless giant planets
Imparipes dilatatus Mahunka & Zaki 1982
No full text<i>Imparipes dilatatus</i> Mahunka & Zaki, 1982 <p> <b>World distribution</b> – This species was described from Hungary and reported from Ukraine (Khaustov 2008).</p> <p> <b>Material examined</b> – Two females were found in soil sample of Galogah-Damghan forestry road, 36.38° N, 53.49° E, and altitude 1000 m a.s.l., June 12, 2021, coll. M. Davari.</p> <p> <b>Remarks</b> – This species is new for mite fauna of Iran.</p>Published as part of <i>Rahiminejad, Vahid, Hakimitabar, Masoud, Davari, Milad & Yahyapour, Eliye, 2023, Scutacarid mites (Acari: Heterostigmata: Scutacaroidea) of Mazandaran province, northern Iran, pp. 159-163 in Persian Journal of Acarology 13 (1)</i> on page 160, DOI: 10.22073/pja.v13i1.84210, <a href="http://zenodo.org/record/10943170">http://zenodo.org/record/10943170</a>
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Ustekinumab for the treatment of psoriatic arthritis: an update
No full textParastoo Davari, Michael S Leo, Faranak Kamangar, Nasim Fazel Department of Dermatology, University of California, Davis, CA, USA Abstract: Psoriatic arthritis occurs in 30% of psoriasis patients, and the treatment can be challenging in some patients. Recently, the US Food and Drug Administration approved ustekinumab, a fully human monoclonal antibody, for the management of psoriatic arthritis. In this article, we review large-scale randomized clinical trials addressing the efficacy and safety profile of ustekinumab for the treatment of psoriatic arthritis. Keywords: psoriatic arthritis, psoriasis, ustekinumab 
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Advanced sustainable floating photocatalysts for wastewater remediation
No full textWater is one of Earth’s most important molecules: it is essential for life in our world. Climate change is reshaping water access by causing both droughts and floods: there is not enough water, and the amount that is available is usually tainted with some level of pollutants [1]. In this drastic scenario, treating wastewater contaminated by different pollutants is of crucial environmental and commercial importance and urgently requires fast and highly efficient solutions. Heterogeneous photocatalysis has emerged as an interesting strategy for its ability to degrade mixtures of pollutants without the addition of chemical oxidants under mild conditions [2]. However, photocatalytic processes are less effective when used to treat trace concentrations of pollutants in a large volume of contaminated matrices due to the large reactor sizes, the limited light penetration, the high energy cost, and the difficulties in recycling/reusing the photocatalysts. To facilitate the degradation of pollutants traces, different composites have been studied [3]. However, they are nano-sized materials that, although common, raises concerns about nanotoxicity. The ideal photocatalyst should possess activity, selectivity, stability, non-toxicity, cheapness, and easy handling. Achieving all these requirements is a difficult task.
Herein, we present our results related to the development of sustainable photoactive materials obtained by immobilizing innovative adsorptive photocatalysts (i.e., bismuth oxyhalides), on eco-friendly floating supports (e.g., alginate spheres, and Lightweight Expanded Clay Aggregate, LECA). Their obtained performances in the degradation of different pollutants (e.g., dyes, drugs, polyphenols) after exposure to solar light irradiation will be illustrated. A targeted study of the role of water matrix (ultrapure or simulated drinking water), catalyst dosage, type of floating support and recycling tests, approaching the actual application, will be presented with the aim to provide an insight on potential and limitations of each floating device selected for the real application. The promising results obtained open the view toward the future real use of these innovative systems, acting as a bridge between environmental remediation and water reuse.
[1] https://www.who.int/news-room/fact-sheets/detail/drinking-water.
[2] Djellabi, R. et al., Curr. Opin. Chem. Eng., 2021, 1, 100696.
[3] Galloni, M.G. et al., Catalysts 2022, 12(8), 923
The vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
Scutacarus (Scutacarus) echidna Soil
No full text<i>Scutacarus</i> (<i>Scutacarus</i>) <i>echidna</i> (Berlese, 1905) <p> <b>World distribution</b> – Previously, this species was recorded from Italy, Germany, Greece, Hungary, France, Russia, Korea and Ukraine (Khaustov 2008).</p> <p> <b>Material examined</b> – Four females were extracted from soil samples and forest litter under old trees of Galogah-Damghan forestry road, 36.08° N, 53.48° E, and altitude 1000 m a.s.l., June 12, 2021, coll. M. Davari.</p> <p> <b>Remarks</b> – This species is new for mite fauna of Iran.</p>Published as part of <i>Rahiminejad, Vahid, Hakimitabar, Masoud, Davari, Milad & Yahyapour, Eliye, 2023, Scutacarid mites (Acari: Heterostigmata: Scutacaroidea) of Mazandaran province, northern Iran, pp. 159-163 in Persian Journal of Acarology 13 (1)</i> on page 160, DOI: 10.22073/pja.v13i1.84210, <a href="http://zenodo.org/record/10943170">http://zenodo.org/record/10943170</a>
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
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