On the Suprema Distribution of Gaussian Processes with Stationary Increment and Drift

In this report we study the suprema distribution of a class of Gaussian processes having stationary increments and negative drift using key results from ~Txtrerne Value Theory. We focus on deriving an asymptotic upper bound to the tail of the suprema distribution of such processes. Our bound is valid for both discrete- and continuous-time processes. VVe discuss the importance of the bound, its applicability to queueing problems, and show numerical examples to illustrate its performance

Understanding Students is the Key to Be a Good Professor

Unlike many writings about the quality of a “good professor” by educators in higher education, the authors attempt to identify the key attributes of good professors from the point of view of students, not professors. Through the open ended questionnaires administered without notification in business and economics classes with respondents remaining anonymous, the study reveals that the four most important attributes of being a good professor are understanding the students, organized presentations, enthusiastic excitement, and knowledge on the teaching subject. This data was gathered from business students of a state university in mid-west, USA. Based on the findings, the authors present strategies for success in classroom teaching along with practical suggestions for new aspiring professors who are eager to launch their teaching career as well as those that are eager to improve teaching performance in higher education

Forbidden ordinal patterns in higher dimensional dynamics

Forbidden ordinal patterns are ordinal patterns (or `rank blocks') that cannot appear in the orbits generated by a map taking values on a linearly ordered space, in which case we say that the map has forbidden patterns. Once a map has a forbidden pattern of a given length $L_{0}$, it has forbidden patterns of any length $L\ge L_{0}$ and their number grows superexponentially with $L$. Using recent results on topological permutation entropy, we study in this paper the existence and some basic properties of forbidden ordinal patterns for self maps on n-dimensional intervals. Our most applicable conclusion is that expansive interval maps with finite topological entropy have necessarily forbidden patterns, although we conjecture that this is also the case under more general conditions. The theoretical results are nicely illustrated for n=2 both using the naive counting estimator for forbidden patterns and Chao's estimator for the number of classes in a population. The robustness of forbidden ordinal patterns against observational white noise is also illustrated.Comment: 19 pages, 6 figure

Ascaroside Signaling Is Widely Conserved among Nematodes

Background: Nematodes are among the most successful animals on earth and include important human pathogens, yet little is known about nematode pheromone systems. A group of small molecules called ascarosides has been found to mediate mate finding, aggregation, and developmental diapause in Caenorhabditis elegans, but it is unknown whether ascaroside signaling exists outside of the genus Caenorhabditis. Results: To determine whether ascarosides are used as signaling molecules by other nematode species, we performed a mass spectrometry-based screen for ascarosides in secretions from a variety of both free-living and parasitic (plant, insect, and animal) nematodes. We found that most of the species analyzed, including nematodes from several different clades, produce species-specific ascaroside mixtures. In some cases, ascaroside biosynthesis patterns appear to correlate with phylogeny, whereas in other cases, biosynthesis seems to correlate with lifestyle and ecological niche. We further show that ascarosides mediate distinct nematode behaviors, such as retention, avoidance, and long-range attraction, and that different nematode species respond to distinct, but overlapping, sets of ascarosides. Conclusions: Our findings indicate that nematodes utilize a conserved family of signaling molecules despite having evolved to occupy diverse ecologies. Their structural features and level of conservation are evocative of bacterial quorum sensing, where acyl homoserine lactones (AHLs) are both produced and sensed by many species of gram-negative bacteria. The identification of species-specific ascaroside profiles may enable pheromone-based approaches to interfere with reproduction and survival of parasitic nematodes, which are responsible for significant agricultural losses and many human diseases worldwide

Unpacking overtourism as a discursive formation through interdiscursivity

Purpose As tourism destinations grapple with declines in tourist arrivals due to COVID-19 measures, scholarly debate on overtourism remains active, with discussions on solutions that could be enacted to contain the excessive regrowth of tourism and the return of “overtourism”. As social science holds an important role and responsibility to inform the debate on overtourism, this paper aims to understand overtourism by examining it as a discursive formation. Design/methodology/approach The paper explores recurring thematic threads in scholarly overtourism texts, given the phrases coherence as a nodal-point is partially held in place by a collective body of texts authored by a network of scholars who have invested in it. The paper uses interdiscursivity as an interpretative framework to identify overlapping thematic trajectories found in existing discourses. Findings Overtourism, as a discursive formation, determines what can and should be said about the self-evident “truths” of excessive tourist arrivals, the changes tourists bring to destinations and the range of discursive solutions available to manage or end overtourism. As the interpellation of these thematic threads into scholarly texts is based on a sense of crisis and urgency, the authors find that the themes contain rhetoric, arguments and metaphors that problematise tourists and construct them as objects in need of control and correction. Originality/value While the persistence of the discursive formation will be determined by the degree to which scholarly and other actors recognise themselves in it, this paper may enable overtourism scholars to become aware of the limits of their discursive domain and help them to expand the discourse or weave a new one. 设计/方法论/方法 本文探讨了过度旅游研究文本中反复出现的主题线索, 鉴于这些短语连贯性作为一个节点, 由学者们组成的网络所研究的一组文本所组成。本文将互辩作为一个解释框架来识别现有语篇中重叠的主题轨迹。 目的 随着旅游目的地应对因新冠病毒−19措施而导致的游客人数下降, 关于过度旅游的学术辩论仍然活跃, 通过讨论可以制定的解决方案, 以遏制旅游业的过度再生和“过度旅游”的再现。由于社会科学在有关过度旅游的辩论中扮演着重要的角色和责任, 本文试图通过将其作为一种话语形式进行考察来理解过度旅游。 结果 作为一种话语形式, 过度旅游展现了过量游客所带来的不言而喻的“真相”、游客给目的地带来的变化以及可用于管理或结束过度旅游的一系列解决方案。由于这些主题线索在学术文本中的质询是基于危机感和紧迫感, 我们发现这些主题包含修辞、论据和隐喻, 使游客感到困惑, 并将其构建为需要控制和纠正的对象。 创新/价值 尽管话语形成的持续性将取决于学者和其他参与者在其中认识到自己的程度, 但本文可能会使过度旅游学者意识到其话语领域的局限性, 并帮助他们扩展话语或构建新的话语。 Propósito A medida que los destinos turísticos lidian con la disminución de las llegadas de turistas debido a las medidas del COVID-19, el debate académico sobre el “sobreturismo” permanece activo, con discusiones sobre soluciones que podrían promulgarse para contener el crecimiento excesivo del turismo y el regreso del “sobreturismo”. La ciencia tiene un papel importante y una responsabilidad en informar sobre el debate del “sobreturismo”, este artículo busca entender el constructo de “sobreturismo”, examinándolo como una formación discursiva. Diseño/metodología/enfoque El artículo explora los hilos temáticos recurrentes en los textos académicos sobre el “sobreturismo”, dada la coherencia de las frases como un punto nodal, mantenida parcialmente en su lugar, por un cuerpo colectivo de textos escritos por una red de académicos, los cuales han invertido tiempo en ellos. El artículo utiliza la inter-discursividad como marco interpretativo a la hora de identificar trayectorias temáticas superpuestas que se encuentran en las disertaciones existentes. Hallazgos El sobreturismo, como formación discursiva, determina lo que puede y debe decirse sobre las “verdades” evidentes de la llegada excesiva de turistas, los cambios que los turistas traen a los destinos y la gama de soluciones discursivas disponibles para gestionar o acabar con el “sobreturismo”. Como la interpelación de estos hilos temáticos en textos académicos se basa en un sentido de crisis y urgencia, encontramos que los temas contienen retórica, argumentos y metáforas que problematizan a los turistas y los construyen como objetos que necesitan control y corrección. Originalidad/valor Si bien la persistencia de la formación discursiva estará determinada por el grado en que los académicos y otros actores se reconozcan en ella, este artículo puede permitir a los estudiosos del “sobreturismo” tomar conciencia de los límites de su dominio discursivo y ayudarlos a expandir el discurso o tejer un discurso nuevo.Purpose As tourism destinations grapple with declines in tourist arrivals due to COVID-19 measures, scholarly debate on overtourism remains active, with discussions on solutions that could be enacted to contain the excessive regrowth of tourism and the return of “overtourism”. As social science holds an important role and responsibility to inform the debate on overtourism, this paper aims to understand overtourism by examining it as a discursive formation. Design/methodology/approach The paper explores recurring thematic threads in scholarly overtourism texts, given the phrases coherence as a nodal-point is partially held in place by a collective body of texts authored by a network of scholars who have invested in it. The paper uses interdiscursivity as an interpretative framework to identify overlapping thematic trajectories found in existing discourses. Findings Overtourism, as a discursive formation, determines what can and should be said about the self-evident “truths” of excessive tourist arrivals, the changes tourists bring to destinations and the range of discursive solutions available to manage or end overtourism. As the interpellation of these thematic threads into scholarly texts is based on a sense of crisis and urgency, the authors find that the themes contain rhetoric, arguments and metaphors that problematise tourists and construct them as objects in need of control and correction. Originality/value While the persistence of the discursive formation will be determined by the degree to which scholarly and other actors recognise themselves in it, this paper may enable overtourism scholars to become aware of the limits of their discursive domain and help them to expand the discourse or weave a new one. 设计/方法论/方法 本文探讨了过度旅游研究文本中反复出现的主题线索, 鉴于这些短语连贯性作为一个节点, 由学者们组成的网络所研究的一组文本所组成。本文将互辩作为一个解释框架来识别现有语篇中重叠的主题轨迹。 目的 随着旅游目的地应对因新冠病毒−19措施而导致的游客人数下降, 关于过度旅游的学术辩论仍然活跃, 通过讨论可以制定的解决方案, 以遏制旅游业的过度再生和“过度旅游”的再现。由于社会科学在有关过度旅游的辩论中扮演着重要的角色和责任, 本文试图通过将其作为一种话语形式进行考察来理解过度旅游。 结果 作为一种话语形式, 过度旅游展现了过量游客所带来的不言而喻的“真相”、游客给目的地带来的变化以及可用于管理或结束过度旅游的一系列解决方案。由于这些主题线索在学术文本中的质询是基于危机感和紧迫感, 我们发现这些主题包含修辞、论据和隐喻, 使游客感到困惑, 并将其构建为需要控制和纠正的对象。 创新/价值 尽管话语形成的持续性将取决于学者和其他参与者在其中认识到自己的程度, 但本文可能会使过度旅游学者意识到其话语领域的局限性, 并帮助他们扩展话语或构建新的话语。 Propósito A medida que los destinos turísticos lidian con la disminución de las llegadas de turistas debido a las medidas del COVID-19, el debate académico sobre el “sobreturismo” permanece activo, con discusiones sobre soluciones que podrían promulgarse para contener el crecimiento excesivo del turismo y el regreso del “sobreturismo”. La ciencia tiene un papel importante y una responsabilidad en informar sobre el debate del “sobreturismo”, este artículo busca entender el constructo de “sobreturismo”, examinándolo como una formación discursiva. Diseño/metodología/enfoque El artículo explora los hilos temáticos recurrentes en los textos académicos sobre el “sobreturismo”, dada la coherencia de las frases como un punto nodal, mantenida parcialmente en su lugar, por un cuerpo colectivo de textos escritos por una red de académicos, los cuales han invertido tiempo en ellos. El artículo utiliza la inter-discursividad como marco interpretativo a la hora de identificar trayectorias temáticas superpuestas que se encuentran en las disertaciones existentes. Hallazgos El sobreturismo, como formación discursiva, determina lo que puede y debe decirse sobre las “verdades” evidentes de la llegada excesiva de turistas, los cambios que los turistas traen a los destinos y la gama de soluciones discursivas disponibles para gestionar o acabar con el “sobreturismo”. Como la interpelación de estos hilos temáticos en textos académicos se basa en un sentido de crisis y urgencia, encontramos que los temas contienen retórica, argumentos y metáforas que problematizan a los turistas y los construyen como objetos que necesitan control y corrección. Originalidad/valor Si bien la persistencia de la formación discursiva estará determinada por el grado en que los académicos y otros actores se reconozcan en ella, este artículo puede permitir a los estudiosos del “sobreturismo” tomar conciencia de los límites de su dominio discursivo y ayudarlos a expandir el discurso o tejer un discurso nuevo.status: Published onlin

Spin-3/2 Baryons in Lattice QCD

We present first results for masses of spin-3/2 baryons in lattice QCD, using a novel fat-link clover fermion action in which only the irrelevant operators are constructed using fat links. In the isospin-1/2 sector, we observe, after appropriate spin and parity projection, a strong signal for the J^P=3/2^- state, and find good agreement between the 1/2^+ mass and earlier nucleon mass simulations with a spin-1/2 interpolating field. For the isospin-3/2 Delta states, clear mass splittings are observed between the various 1/2^+/- and 3/2^+/- channels, with the calculated level orderings in good agreement with those observed empirically