2,484 research outputs found
Vertex critical 4-dichromatic circulant tournaments
No full textAbstractAn infinite family of vertex critical 4-dichromatic circulant tournaments is presented, answering a problem posed by Neumann-Lara and Urrutia (1984)
A conjecture of Neumann-Lara on infinite families of r-dichromatic circulant tournaments
No full textAbstractIn this paper, we exhibit infinite families of vertex critical r-dichromatic circulant tournaments for all r≥3. The existence of these infinite families was conjectured by Neumann-Lara [V. Neumann-Lara, Note on vertex critical 4-dichromatic circulant tournaments, Discrete Math. 170 (1997) 289–291], who later proved it for all r≥3 and r≠7. Using different methods, we provide new constructions of such infinite families for all r≥3, which covers the case r=7 and thus settles the conjecture
Negative correlation between Nosema ceranae spore loads and deformed wing virus infection levels in adult honey bee workers
No full textInteractions between pathogens might contribute to honey bee colony losses. Here we investigated if there is an association between the microsporidian Nosema ceranae and the deformed wing virus (DWV) in different body sections of individual honey bee workers (Apis mellifera ligustica) under exclusion of the vector Varroa destructor. Our data provide correlational evidence for antagonistic interactions between the two pathogens in the midgut of the bees
On clique-divergent graphs
No full textThis article presents results on expansive graphs that Víctor Neumann-Lara obtained in the late 1970’s and reported mostly without proofs in [8] and [9]. The untimely death of Víctor left us to complete this project, which had started in [7]. We had at hand [8, 9] and the manuscript [10] that, using his old notebooks
Clique divergent clockwork graphs and partial orders
No full textAbstractS. Hazan and V. Neumann-Lara proved in 1996 that every finite partially ordered set whose comparability graph is clique null has the fixed point property and they asked whether there is a finite poset with the fixed point property whose comparability graph is clique divergent. In this work we answer that question by exhibiting such a finite poset. This is achieved by developing further the theory of clockwork graphs. We also show that there are polynomial time algorithms that recognize clockwork graphs and decide whether they are clique divergent
ChatGPT-Based Learning And Reading Assistant (C-LARA): Second Report
No full textChatGPT-based Learning And Reading Assistant (C-LARA – pronounced “Clara”) is an AIbasedplatform which allows users to create multimodal texts designed to improve reading skillsin second languages. GPT-4/ChatGPT-4 is central to the project: as well as being the corelanguage processing component, it has in collaboration with a human partner developed thegreater part of the codebase.Following on from the initial progress report, released in July 2023, we focus on new workcarried out during the period August 2023 – March 2024. The platform is far more usable. CLARAis now packaged with a wizard-style interface (“Simple C-LARA”) that allows the nonexpertuser to create a complete illustrated multimodal text by entering a prompt and approvingdefault choices a few times, and the software is deployed on a fast dedicated server maintained bythe University of South Australia. Other substantial new pieces of functionality are support for“phonetic texts”, where words are automatically divided up into units associated with phoneticvalues; “reading histories”, which support the combination of several texts into a single virtualdocument; and the social network, rudimentary in the first version, which now includes supportfor friending, an update feed, and email alerts.To investigate the AI’s abilities as a language processor, we present an experiment where wecreated six texts for each of five languages, using the same prompts for each language, andevaluated the accuracy of the language processing. We also give the results when some of theexperiments were repeated five months later with a newer version of GPT-4, in the case ofEnglish revealing a dramatic reduction in error rates. A small questionnaire-based study probesusers’ subjective views of C-LARA projects they have created: in general, people are pleasedwith the results, to the extent that they are often sharing them.With regard to GPT-4/ChatGPT-4’s software engineer role, we present a breakdown of thevarious modules and functionalities, indicating the AI’s contribution. It is capable of writing thesimpler modules on its own or with minimal human assistance, and only had serious problemswith a small number of top-level functionalities, in particular “Simple C-LARA”, which directlyor indirectly involved most of the codebase.We describe initial use cases, including trialling of C-LARA in a school classroom, integratingit into the experimental CALL platform Basm, and creating multimodal texts in the Oceaniclanguages Drehu and Iaai. A short section summarises our policy on ethical issues concerningthe crediting of the AI as an author. The appendices present examples illustrating use of theSimple C-LARA and Advanced C-LARA versions of the platform, list functionalities and codefiles, and reproduce conversations with the AI about various aspects of the project
Nosema ceranae and Deformed Wing Virus infections ofhoney bees in a hoarding cage experiment
No full textThe multifactorial nature of colony losses is widely accepted, although synergistic effects of possible causative factors are not completely understood. To investigate interactions between two serious and wide-spread pathogens of honey bee colonies, Deformed Wing Virus and Nosema ceranae, an experiment was set up in which worker bees were infected with known amounts of N. ceranae spores. To reduce the impact of Varroa destructor an apiary was established in an isolated mountain area and mitelevels kept as low as possible. Newly emerged worker bees were kept in 14 hoarding cages (30 bees each). Each cage was provided with 0.2 ml 50% w/v sucrose solution containing20106 N. ceranae spores per ml. Oral infection was therefore obtained via bulk feeding. The number of dead bees in each cage was recorded for ~30 days. After 14 days from beginning of experiment, five live worker bees were removed from each cage. Midguts were removed for spore counts and at the same time, head and thorax of each worker were removed and subsequentlyanalysed for quantitative DWV analyses using standard RT PCR protocols. The data show a strong positive correlation between the number of N. ceranae spores and the number of DWV copies, suggesting that the two pathogens may interact synergistically. N. ceranae may enable oral infection by the virus by perforation of the midgut epithelium, or increase replication of the virus by suppression of the immune system
Letter from The Dominguez Estate Company to Mr. B. Lara, November 24, 1943
No full textInforming Mr. Lara of the change in acreage on his lease with an attached statement
Does Lara Croft Ware Fake Polygons
No full textAn analysis of the role of gender in the 1996 video game, Tomb Raider , using multiple theoretical approaches to discuss issues of gender roles and gender identity. The author argues that prior to Tomb Raider, popular games revolved around a male protagonist, but with the introduction of Lara Croft, the gaming world has changed. The article explores the implications of the female protagonist in Tomb Raider, characterizing Lara Croft as a techno-puppet to the male-gaze, a drag queen, a dominatrix, and a powerful feminist role model. Artistic and creative game patches provide an “opportunity for feminists to influence the formation of new computer game gender configurations”
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