Letteratura scientifica selezionata sul tema "Toric domains"
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Articoli di riviste sul tema "Toric domains"
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Hind, Richard, e Jun Zhang. "Hamiltonian knottedness and lifting paths from the shape invariant". Compositio Mathematica 159, n. 11 (18 settembre 2023): 2416–57. http://dx.doi.org/10.1112/s0010437x23007479.
Testo completoAbstract (sommario):
The Hamiltonian shape invariant of a domain $X \subset \mathbb {R}^4$ , as a subset of $\mathbb {R}^2$ , describes the product Lagrangian tori which may be embedded in $X$ . We provide necessary and sufficient conditions to determine whether or not a path in the shape invariant can lift, that is, be realized as a smooth family of embedded Lagrangian tori, when $X$ is a basic $4$ -dimensional toric domain such as a ball $B^4(R)$ , an ellipsoid $E(a,b)$ with ${b}/{a} \in \mathbb {N}_{\geq ~2}$ , or a polydisk $P(c,d)$ . As applications, via the path lifting, we can detect knotted embeddings of product Lagrangian tori in many toric $X$ . We also obtain novel obstructions to symplectic embeddings between domains that are more general than toric concave or toric convex.
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Chuah, Meng-Kiat. "Reinhardt domains and toric models". Michigan Mathematical Journal 51, n. 1 (aprile 2003): 73–92. http://dx.doi.org/10.1307/mmj/1049832894.
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Landry, Michael, Matthew McMillan e Emmanuel Tsukerman. "On symplectic capacities of toric domains". Involve, a Journal of Mathematics 8, n. 4 (23 giugno 2015): 665–76. http://dx.doi.org/10.2140/involve.2015.8.665.
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Marinković, Aleksandra. "Examples of Weinstein Domains in the Complement of Smoothed Total Toric Divisors". Mathematica Slovaca 73, n. 4 (1 agosto 2023): 997–1012. http://dx.doi.org/10.1515/ms-2023-0074.
Testo completoAbstract (sommario):
ABSTRACT In [ACG+1] and [ACG+2], it is shown that a complement of a neighborhood of a partially smoothed total toric divisor of a closed toric symplectic 4-manifold is a Weinstein domain. In this article, we extend the family of Weinstein domains that can be realized as such complements by producing an infinite family of new examples.
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Choi, Keon, Michael Hutchings, Daniel Cristofaro-Gardiner, David Frenkel e Vinicius Gripp Barros Ramos. "Symplectic embeddings into four-dimensional concave toric domains". Journal of Topology 7, n. 4 (22 maggio 2014): 1054–76. http://dx.doi.org/10.1112/jtopol/jtu008.
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Sparavigna, A., A. Mello e B. Montrucchio. "Growth of toric domains in mesophases of oxadiazoles". Phase Transitions 81, n. 5 (maggio 2008): 471–77. http://dx.doi.org/10.1080/01411590701854938.
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McDuff, Dusa, e Kyler Siegel. "Symplectic capacities, unperturbed curves and convex toric domains". Geometry & Topology 28, n. 3 (10 maggio 2024): 1213–85. http://dx.doi.org/10.2140/gt.2024.28.1213.
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Blanc, Christophe, e Maurice Kleman. "Tiling the plane with noncongruent toric focal conic domains". Physical Review E 62, n. 5 (1 novembre 2000): 6739–48. http://dx.doi.org/10.1103/physreve.62.6739.
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Cristofaro-Gardiner, Dan. "Symplectic embeddings from concave toric domains into convex ones". Journal of Differential Geometry 112, n. 2 (giugno 2019): 199–232. http://dx.doi.org/10.4310/jdg/1559786421.
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Munteanu, Mihai. "Noncontractible loops of symplectic embeddings between convex toric domains". Journal of Symplectic Geometry 18, n. 4 (2020): 1169–96. http://dx.doi.org/10.4310/jsg.2020.v18.n4.a8.
Testo completoTesi sul tema "Toric domains"
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Dardennes, Julien. "Non-convexité symplectique des domaines toriques". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES102.
Testo completoAbstract (sommario):
La convexité joue un rôle particulier en géométrie symplectique, pourtant ce n'est pas une notion invariante par symplectomorphisme. Dans un article fondateur, Hofer, Wysocki et Zehnder ont montré que tout domaine fortement convexe est dynamiquement convexe, une notion, qui elle, est invariante par symplectomorphisme. Depuis plus de vingt ans, l'existence ou non de domaines dynamiquement convexes qui ne sont pas symplectomorphes à un convexe est restée une question ouverte. Récemment, Chaidez et Edtmair ont répondu à cette question en dimension 4. Ils ont établi un critère "quantitatif" de convexité symplectique puis ont construit des domaines dynamiquement convexes qui ne vérifient pas ce critère. Dans cette thèse, nous utilisons ce critère pour construire de nouveaux exemples de tels domaines en dimension 4, qui ont la propriété additionnelle d'être torique. De plus, nous estimons les constantes intervenant dans ce critère. Ce travail en collaboration avec Jean Gutt et Jun Zhang a été ensuite utilisé par Chaidez et Edtmair pour résoudre la question initiale en toute dimension. Dans un second temps, en collaboration avec Jean Gutt, Vinicius G.B.Ramos et Jun Zhang, nous étudions la distance des domaines dynamiquement convexes aux domaines symplectiquement convexes. Nous montrons qu'en dimension 4, celle-ci est arbitrairement grande aux yeux d'un analogue symplectique de la distance de Banach-Mazur. Au passage, nous reprouvons de manière indépendante l'existence de domaines dynamiquement convexes non symplectiquement convexes en dimension 4Convexity plays a special role in symplectic geometry, but it is not a notion that is invariant by symplectomorphism. In a seminal work, Hofer, Wysocki and Zehnder showed that any strongly convex domain is dynamically convex, a notion that is invariant by symplectomorphism. For more than twenty years, the existence or not of dynamically convex domains that are not symplectomorphic to a convex domain has remained an open question. Recently, Chaidez and Edtmair answered this question in dimension 4. They established a "quantitative" criterion of symplectic convexity and constructed dynamically convex domains that do not satisfy this criterion. In this thesis, we use this criterion to construct new examples of such domains in dimension 4, which have the additional property of being toric. Moreover, we estimate the constants involved in this criterion. This work in collaboration with Jean Gutt and Jun Zhang was later used by Chaidez and Edtmair to solve the initial question in all dimensions. Furthermore, in collaboration with Jean Gutt, Vinicius G.B.Ramos and Jun Zhang, we study the distance from dynamically convex domains to symplectically convex domains. We show that in dimension 4, this distance is arbitrarily large with respect to a symplectic analogue of the Banach-Mazur distance. Additionally, we independently reprove the existence of dynamically convex domains that are not symplectically convex in dimension 4
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Yang, Li. "Improving Topic Tracking with Domain Chaining". Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4274/.
Testo completoAbstract (sommario):
Topic Detection and Tracking (TDT) research has produced some successful statistical tracking systems. While lexical chaining, a non-statistical approach, has also been applied to the task of tracking by Carthy and Stokes for the 2001 TDT evaluation, an efficient tracking system based on this technology has yet to be developed. In thesis we investigate two new techniques which can improve Carthy's original design. First, at the core of our system is a semantic domain chainer. This chainer relies not only on the WordNet database for semantic relationships but also on Magnini's semantic domain database, which is an extension of WordNet. The domain-chaining algorithm is a linear algorithm. Second, to handle proper nouns, we gather all of the ones that occur in a news story together in a chain reserved for proper nouns. In this thesis we also discuss the linguistic limitations of lexical chainers to represent textual meaning.
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Ahn, Kisuh. "Topic indexing and retrieval for open domain factoid question answering". Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3794.
Testo completoAbstract (sommario):
Factoid Question Answering is an exciting area of Natural Language Engineering that has the potential to replace one major use of search engines today. In this dissertation, I introduce a new method of handling factoid questions whose answers are proper names. The method, Topic Indexing and Retrieval, addresses two issues that prevent current factoid QA system from realising this potential: They can’t satisfy users’ demand for almost immediate answers, and they can’t produce answers based on evidence distributed across a corpus. The first issue arises because the architecture common to QA systems is not easily scaled to heavy use because so much of the work is done on-line: Text retrieved by information retrieval (IR) undergoes expensive and time-consuming answer extraction while the user awaits an answer. If QA systems are to become as heavily used as popular web search engines, this massive process bottle-neck must be overcome. The second issue of how to make use of the distributed evidence in a corpus is relevant when no single passage in the corpus provides sufficient evidence for an answer to a given question. QA systems commonly look for a text span that contains sufficient evidence to both locate and justify an answer. But this will fail in the case of questions that require evidence from more than one passage in the corpus. Topic Indexing and Retrieval method developed in this thesis addresses both these issues for factoid questions with proper name answers by restructuring the corpus in such a way that it enables direct retrieval of answers using off-the-shelf IR. The method has been evaluated on 377 TREC questions with proper name answers and 41 questions that require multiple pieces of evidence from different parts of the TREC AQUAINT corpus. With regards to the first evaluation, scores of 0.340 in Accuracy and 0.395 in Mean Reciprocal Rank (MRR) show that the Topic Indexing and Retrieval performs well for this type of questions. A second evaluation compares performance on a corpus of 41 multi-evidence questions by a question-factoring baseline method that can be used with the standard QA architecture and by my Topic Indexing and Retrieval method. The superior performance of the latter (MRR of 0.454 against 0.341) demonstrates its value in answering such questions.
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Selcuk, Dogan Gonca Hulya. "Expert Finding In Domains With Unclear Topics". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614259/index.pdf.
Testo completoAbstract (sommario):
Expert finding is an Information Retrieval (IR) task that is used to find the needed experts. To find the needed experts is a noticeable problem in many commercial, educational or governmental organizations. It is highly crucial to find the appropriate experts, when seeking referees for a paper submitted to a conference or when looking for a consultant for a software project. It is also important to find the similar experts in case of the absence or the inability of the selected expert. Traditional expert finding methods are modeled based on three components which are a supporting document collection, a list of candidate experts and a set of pre-defined topics. In reality, most of the time pre-defined topics are not available. In this study, we propose an expert finding system which generates a semantic layer between domains and experts using Latent Dirichlet Allocation (LDA). A traditional expert finding method (voting approach) is used in order to match the domains and the experts as the baseline method. In case similar experts are needed, the system recommends experts matching the qualities of the selected experts. The proposed model is applied to a semi-synthetic data set to prove the concept and it performs better than the baseline method. The proposed model is also applied to the projects of the Technology and Innovation Funding Programs Directorate (TEYDEB) of The Scientific and Technological Research Council of Turkey (TÜB
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Lane, Ian Richard. "Flexible spoken language understanding based on topic classification and domain detection". 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/143888.
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Arbogast, Matthew S. "Egos Gone Wild: Threat Detection and the Domains Indicative of Toxic Leadership". Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7664.
Testo completoAbstract (sommario):
Toxic leaders are a serious problem, but shockingly, there is no standard detection tool that is both efficient and accurate. Compounding the problem are the various definitions and descriptions used to operationalize toxic leadership. This research sought to align the literature, offer a concise definition, and assess the domains indicative of toxic leadership through two conceptually compatible studies. Study 1 involved development of a toxic leader threat detection scale. Results using a variable-centered approach indicated that follower perceptions (n = 357) of leader empathy (4-item scale; α = .93) and the need for achievement recognition (4-item scale; α = .83) significantly predicted the egoistic dominance behaviors (5-item scale; α = .93) employed by toxic leaders (R2 = .647, p < .001). Using a person-centered approach, the scale scores also revealed latent clusters of distinct behavioral patterns, representing significantly different toxic leader threat levels (low, medium, and high). Study 2 assessed whether followers (n = 357), without access to behavioral information, would infer toxic characteristics simply from a leader’s physical appearance. Participants perceived images of male leaders (η2 = .131) with masculine facial structures (η2 = .596) as most likely to behave aggressively, while feminine facial structures (η2 = .400) and female images (η2 = .104) created the highest perceptions of empathy. The subjects also selected male leaders with masculine faces (η2 = .044; η2 = .015) as more likely to desire recognition, but with an inverse relationship (η2 = .073) such that feminine looking males earned the lowest scores. Overall, these results supported the idea that empathy and the need for achievement recognition create an “ego gone wild” condition and, not only can we measure the behavioral tendencies of toxic leaders, but perhaps we can “see” them as well.
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Zhang, Tong. "A topic model-based approach for ontology extension in the computational materials science domain". Thesis, Linköpings universitet, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-172281.
Testo completoAbstract (sommario):
With the continuous development and progress of human society, the demand for advanced materials in all walks of life is increasing day by day. No matter in the agrarian age or the information age, human beings have always been tireless in the study of materials science, and the field of computational materials science has been the exploration of computational methods in materials science. However, with the deepening of the research, the scale of research data related to materials science is getting larger and larger, and each research institution establishes their own material information management system. The diversity of the materials data structure and storage form causes the fuzziness of the data structure and the complexity of the integrated data. In order to make data findable and reusable, scientists introduce the concept of ontology in philosophy to generalize the context and structure of data. An ontology is mainly by the field representative extremely, including meaningful concepts and the relationship between concepts. There are a few ontologies found in the computational materials science domain, called Materials Design Ontology (MDO). This thesis mined the representative concepts and relations to extend the MDO. In order to achieve this goal, an improved Topmine framework was deployed, containing a new frequent phrase mining algorithm and an improved phrase-based Latent Dirichlet Allocation (LDA) topic model. The improved Topmine framework introduced the Part-of-Speech Tagging and defined weighted coefficients. The time and space complexity had been reduced from quadratic to linear. And the perplexity of the phrase-based LDA was reduced 26.7%, which means the results are more concentrated and accurate. Meanwhile, the concept lattice is constructed with the idea of formal concept analysis to extend the relations of the domain ontology. In brief, this paper studied the titles and abstracts of more than 9000 pieces of field literature collected to extend MDO, and demonstrate the practicability and practicality of this framework by comparing the experimental results with the existing algorithms.
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Netterberg, Max, e Simon Wahlström. "Design and training of a recommendersystem on an educational domain using Topic & Term-Frequency modeling". Thesis, Uppsala universitet, Avdelningen för visuell information och interaktion, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445986.
Testo completoAbstract (sommario):
This thesis investigates the possibility to create a machine learning powered recommendersystem from educational material supplied by a media provider company. By limiting theinvestigation to a single company's data the thesis provides insights into how a limited datasupply can be utilized in creating a first iteration recommender system. The methods includesemi structured interviews with system experts, constructing a model-building pipeline andtesting the models on system experts via a web interface. The study paints a good picture ofwhat kind of actions you can take when designing content based filtering recommender systemand what actions to take when moving on to further iterations. The study showed that userpreferences may be decisive for the relevancy of the provided recommendations for a specificmedia content. Furthermore, the study showed that Term Frequency Inverse DocumentFrequency modeling was significantly better than using an Elasticsearch database to serverecommendations. Testing also indicated that using term frequency document inversefrequency created a better model than using topic modeling techniques such as latent dirichletallocation. However as testing was only conducted on system experts in a controlledenvironment, further iterations of testing is necessary to statistically conclude that these modelswould lead to an increase in user experience.
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Ellouze, Nebrasse. "Approche de recherche intelligente fondée sur le modèle des Topic Maps : application au domaine de la construction durable". Phd thesis, Conservatoire national des arts et metiers - CNAM, 2010. http://tel.archives-ouvertes.fr/tel-00555929.
Testo completoAbstract (sommario):
Cette thèse aborde les problématiques liées à la construction de Topic Maps et à leur utilisation pour la recherche d'information dans le cadre défini par le Web sémantique (WS). Le WS a pour objectif de structurer les informations disponibles sur le Web. Pour cela, les ressources doivent être sémantiquement étiquetées par des métadonnées afin de permettre d'optimiser l'accès à ces ressources. Ces métadonnées sont actuellement spécifiées à l'aide des deux standards qui utilisent le langage XML : RDF et les Topic Maps. Un contenu à organiser étant très souvent volumineux et sujet à enrichissement perpétuel, il est pratiquement impossible d'envisager une création et gestion d'une Topic Map, le décrivant, de façon manuelle. Plusieurs travaux de recherche ont concerné la construction de Topic Maps à partir de documents textuels [Ellouze et al. 2008a]. Cependant, aucune d'elles ne permet de traiter un contenu multilingue. De plus, bien que les Topic Maps soient, par définition, orientées utilisation (recherche d'information), peu d'entre elles prennent en compte les requêtes des utilisateurs.Dans le cadre de cette thèse, nous avons donc conçu une approche que nous avons nommée ACTOM pour " Approche de Construction d'une TOpic Map Multilingue ". Cette dernière sert à organiser un contenu multilingue composé de documents textuels. Elle a pour avantage de faciliter la recherche d'information dans ce contenu. Notre approche est incrémentale et évolutive, elle est basée sur un processus automatisé, qui prend en compte des documents multilingues et l'évolution de la Topic Map selon le changement du contenu en entrée et l'usage de la Topic Map. Elle prend comme entrée un référentiel de documents que nous construisons suite à la segmentation thématique et à l'indexation sémantique de ces documents et un thésaurus du domaine pour l'ajout de liens ontologiques. Pour enrichir la Topic Map, nous nous basons sur deux ontologies générales et nous explorons toutes les questions potentielles relatives aux documents sources. Dans ACTOM, en plus des liens d'occurrences reliant un Topic à ses ressources, nous catégorisons les liens en deux catégories: (a) les liens ontologiques et (b) les liens d'usage. Nous proposons également d'étendre le modèle des Topic Maps défini par l'ISO en rajoutant aux caractéristiques d'un Topic des méta-propriétés servant à mesurer la pertinence des Topics plus précisément pour l'évaluation de la qualité et l'élagage dynamique de la Topic Map.
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Ellouze, Nebrasse. "Approche de recherche intelligente fondée sur le modèle des Topic Maps : application au domaine de la construction durable". Electronic Thesis or Diss., Paris, CNAM, 2010. http://www.theses.fr/2010CNAM0736.
Testo completoAbstract (sommario):
Cette thèse aborde les problématiques liées à la construction de Topic Maps et à leur utilisation pour la recherche d’information dans le cadre défini par le Web sémantique (WS). Le WS a pour objectif de structurer les informations disponibles sur le Web. Pour cela, les ressources doivent être sémantiquement étiquetées par des métadonnées afin de permettre d'optimiser l'accès à ces ressources. Ces métadonnées sont actuellement spécifiées à l'aide des deux standards qui utilisent le langage XML : RDF et les Topic Maps. Un contenu à organiser étant très souvent volumineux et sujet à enrichissement perpétuel, il est pratiquement impossible d’envisager une création et gestion d’une Topic Map, le décrivant, de façon manuelle. Plusieurs travaux de recherche ont concerné la construction de Topic Maps à partir de documents textuels [Ellouze et al. 2008a]. Cependant, aucune d’elles ne permet de traiter un contenu multilingue. De plus, bien que les Topic Maps soient, par définition, orientées utilisation (recherche d’information), peu d’entre elles prennent en compte les requêtes des utilisateurs.Dans le cadre de cette thèse, nous avons donc conçu une approche que nous avons nommée ACTOM pour « Approche de Construction d’une TOpic Map Multilingue ». Cette dernière sert à organiser un contenu multilingue composé de documents textuels. Elle a pour avantage de faciliter la recherche d’information dans ce contenu. Notre approche est incrémentale et évolutive, elle est basée sur un processus automatisé, qui prend en compte des documents multilingues et l’évolution de la Topic Map selon le changement du contenu en entrée et l’usage de la Topic Map. Elle prend comme entrée un référentiel de documents que nous construisons suite à la segmentation thématique et à l’indexation sémantique de ces documents et un thésaurus du domaine pour l’ajout de liens ontologiques. Pour enrichir la Topic Map, nous nous basons sur deux ontologies générales et nous explorons toutes les questions potentielles relatives aux documents sources. Dans ACTOM, en plus des liens d’occurrences reliant un Topic à ses ressources, nous catégorisons les liens en deux catégories: (a) les liens ontologiques et (b) les liens d’usage. Nous proposons également d’étendre le modèle des Topic Maps défini par l’ISO en rajoutant aux caractéristiques d’un Topic des méta-propriétés servant à mesurer la pertinence des Topics plus précisément pour l’évaluation de la qualité et l’élagage dynamique de la Topic MapThe research work in this thesis is related to Topic Map construction and their use in semantic annotation of web resources in order to help users find relevant information in these resources. The amount of information sources available today is very huge and continuously increasing, for that, it is impossible to create and maintain manually a Topic Map to represent and organize all these information. Many Topic Maps building approaches can be found in the literature [Ellouze et al. 2008a]. However, none of these approaches takes as input multilingual document content. In addition, although Topic Maps are basically dedicated to users navigation and information search, no one approach takes into consideration users requests in the Topic Map building process. In this context, we have proposed ACTOM, a Topic Map building approach based on an automated process taking into account multilingual documents and Topic Map evolution according to content and usage changes. To enrich the Topic Map, we are based on a domain thesaurus and we propose also to explore all potential questions related to source documents in order to represent usage in the Topic Map. In our approach, we extend the Topic Map model that already exists by defining the usage links and a list of meta-properties associated to each Topic, these meta-properties are used in the Topic Map pruning process. In our approach ACTOM, we propose also to precise and enrich semantics of Topic Map links so, except occurrences links between Topics and resources, we classify Topic Map links in two different classes, those that we have called “ontological links” and those that we have named “usage links”
Libri sul tema "Toric domains"
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Esi, Eyong Lucas. Topic, management: Domain, personnel management in Cameroon (1800-1988) : case study, Ministry of Public Service. [Yaoundé?]: London College of Management, Dept. of Management, 1988.
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M¨uhlherr, Bernhard, Holger P. Petersson e Richard M. Weiss. Linked Tori, II. Princeton University Press, 2017. http://dx.doi.org/10.23943/princeton/9780691166902.003.0006.
Testo completoAbstract (sommario):
This chapter proves several more results about weak isomorphisms between Moufang sets arising from quadratic forms and involutory sets. It first fixes a non-trivial anisotropic quadratic space Λ = (K, L, q) before considering two proper anisotropic pseudo-quadratic spaces. It then describes a quaternion division algebra and its standard involution, a second quaternion division algebra and its standard involution, and an involutory set with a quaternion division algebra and its standard involution. It concludes with one more small observation regarding a pointed anisotropic quadratic space and shows that there is a unique multiplication on L that turns L into an integral domain with a multiplicative identity.
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Strada, E. Alessandra. The First Domain of Palliative Care. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199798551.003.0002.
Testo completoAbstract (sommario):
This chapter proposes palliative psychology competencies in the first domain of palliative care based on the framework of the Clinical Practice Guidelines for Quality Palliative Care. Competencies are conceptualized as comprising knowledge, skills, and attitudes. The role of palliative psychologists is presented through the discussion of clinical case scenarios. These roles for psychologists are discussed in the context of different palliative care settings (inpatient; outpatient, home-based palliative care, hospice). The relevant application of clinical skills is discussed. The difference between palliative care and hospice is also presented. Finally, this chapter approaches the topic of professional self-care, which is conceptualized as a necessary competence for palliative psychologists. The discussion presents risk factors, protective factors, and interventions especially relevant to palliative psychologists.
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Pratt, Michael W., e M. Kyle Matsuba. Civic Engagement and Environmentalism in Emerging Adulthood. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199934263.003.0009.
Testo completoAbstract (sommario):
Chapter 9 focuses on contexts of positive engagement in the domain of the wider society among emerging adults. The authors examine the growing research literature on civic engagement and volunteering, covering patterns of development and change during emerging to young adulthood, describing how this development is linked to the three personality levels of the McAdams and Pals model. They also describe work on one salient contemporary type of civic engagement, environmentalism, and review what is known on this particular topic in youth. The authors cover the evidence on both of these domains from their Futures Study sample, using both questionnaire and narrative material to expand these findings. As a way of illuminating the key points, the chapter ends with a case study of the early life story of John Muir, an important founder of the environmental and conservation movement in the United States.
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Hwui, Chan Sane, e Lay Yoon Fah. Affective Domains Contributing to Behavioural Intention in Teaching Science. UMS Press, 2020. http://dx.doi.org/10.51200/affectivedomainsumspress2020-978-967-2962--27-4.
Testo completoAbstract (sommario):
The teaching profession is a highly stressful occupation and susceptible to burnout due to high levels of workload compared to other contact occupations. In Malaysia, the majority of science teachers are experiencing physical and mental drain after long periods of teaching service and mundane routine year in and year out. Despite the general assumptions of a teacher’s job is merely teaching from a textbook, a teacher’s workload includes teaching-related (class preparation and classroom management) and non-teaching related (administration and meetings). All these challenges required teachers to possess high self-efficacy beliefs, great teaching motivation, and positive attitudes toward teaching science. When the development of the affective domain is neglected during pre-service years, teachers’ behavioural intention in teaching science will subside gradually. This may cause emotional exhaustion, feelings of ineffectiveness, and job burnout when the pre-service teachers start to work in a high-pressure environment. The prime focus of this book includes the use of Partial Least Square-Structural Equation Modelling (PLS-SEM) approach in studying the mediating effect of attitudes toward teaching science in the relationship between teacher self-efficacy beliefs and teaching motivation on behavioural intention in teaching science. This book provides insights for policymakers to formulate courses on managing personal affective domains in the teacher education curriculum. It is also hoped that this book will be of interest to academicians and researchers on the topic related to teacher education and teaching professional development.
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Olson-Buchanan, Julie B., Wendy R. Boswell e Timothy J. Morgan. The Role of Technology in Managing the Work and Nonwork Interface. A cura di Tammy D. Allen e Lillian T. Eby. Oxford University Press, 2015. http://dx.doi.org/10.1093/oxfordhb/9780199337538.013.26.
Testo completoAbstract (sommario):
Technology has markedly changed the work and nonwork domains as well as the way in which individuals navigate between them. This chapter offers a review of the literature on the role of information communication technology (ICT) in the work–nonwork interface. The key theoretical grounding in the literature, boundary theory and boundary management, is presented, particularly as it relates to technology. The predictors, consequences, and moderating factors of ICT use across role domains are examined. Relevant literature within the teleworking context is also discussed. The chapter concludes with a discussion of future research avenues on the topic to enhance our understanding of the role of communication technologies within the work–nonwork domains.
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Feldhaus, Michael, e Karsten Speck, a cura di. Herkunftsfamilie, Partnerschaft und Studienerfolg. Ergon – ein Verlag in der Nomos Verlagsgesellschaft, 2020. http://dx.doi.org/10.5771/9783956507526.
Testo completoAbstract (sommario):
In international and national studies on the topic of academic success and drop-outs, the conditions of the university context were given priority in addition to individual competences. Other life domains of the students were rather neglected. This book analyses the influence of important life domains such as the family of origin, friends and possibly existing partnerships on the students' academic success and drop-out tendency. Based on panel data, quantitative and qualitative approaches are used. The results support the thesis that academic success must be considered as a multidimensional challenge.
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MacIntosh, Robert, e Kevin D. O'Gorman, a cura di. Introducing Management in a Global Context. Goodfellow Publishers, 2015. http://dx.doi.org/10.23912/978-1-910158-47-0-2734.
Testo completoAbstract (sommario):
Covering the major management disciplines, Introducing Management in a Global Context provides an introductory overview of key topic areas and to glimpse the latest research in domains such as strategy, technology and change, economics and development, politics and the social world, marketing, ethics and corporate decision making.
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Kaplan, David M., a cura di. Explanation and Integration in Mind and Brain Science. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199685509.001.0001.
Testo completoAbstract (sommario):
While it has long been a topic of discussion among philosophers and scientists alike, there is growing appreciation that understanding the complex relationship between neuroscience and psychological science is of fundamental importance to achieving progress across these scientific domains. Is the relationship between them one of complete independence or autonomy—like two great ships passing in the night? Or is the relationship one of total dependence—where one is entirely subordinate to the other? Or perhaps the correct picture is one of mutually beneficial interaction and integration—lying somewhere in the middle of these two extremes? We argue that one primary strategy for addressing this issue centers around understanding the nature of explanation in these different domains. By deepening our understanding of the similarities and differences between the explanatory patterns employed across these scientific domains, the contributed chapters in this volume shed valuable light on the relationship between neuroscience and psychology.
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Byros, Vasili. Topics and Harmonic Schemata. A cura di Danuta Mirka. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199841578.013.0015.
Testo completoAbstract (sommario):
Topics and harmonic schemata powerfully interact in the late eighteenth-century communicative channel. This chapter illustrates both a categorial and pragmatic interfacing of the two domains in Beethoven’s “Eroica” Symphony, where a particular schema, thele–sol–fi–sol(Byros 2012, 2009), enables the communication of a powerful philosophical message involving the spiritual consequences of suffering, self-sacrifice, and death. Thele–sol–fi–sol, as an instance of harmonic grammar, is closely related to theombratopic with mortal, funereal, and sacrificial connotations. As a hybrid symbolic structure, this schema–topic amalgam is the basis for establishing a number of correlations of oppositions in the structural and expressive domains of the symphony, which communicate a “tragic-to-transcendent” expressive genre and the cultural unit of “abnegation” (Hatten 1994).
Capitoli di libri sul tema "Toric domains"
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Flynn, Cormac, e John Dunnion. "Domain-Informed Topic Detection". In Computational Linguistics and Intelligent Text Processing, 617–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-24630-5_76.
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Kejriwal, Mayank. "Advanced Topic: Knowledge Graph Completion". In Domain-Specific Knowledge Graph Construction, 59–74. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12375-8_4.
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Schouten, Stefan F., Baran Barbarestani, Wondimagegnhue Tufa, Piek Vossen e Ilia Markov. "Cross-Domain Toxic Spans Detection". In Natural Language Processing and Information Systems, 533–45. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-35320-8_40.
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Röder, Michael, Axel-Cyrille Ngonga Ngomo, Ivan Ermilov e Andreas Both. "Detecting Similar Linked Datasets Using Topic Modelling". In The Semantic Web. Latest Advances and New Domains, 3–19. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34129-3_1.
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Sawer, Marian, e Maria Maley. "Introduction". In Toxic Parliaments, 1–16. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-48328-8_1.
Testo completoAbstract (sommario):
AbstractAlmost 100 years after the arrival of women in the masculine domain of parliament they began breaking the silence about sexual harassment and bullying they experienced. This chapter introduces concepts relating to this experience, including toxic parliaments, sexual and sex-based harassment and bullying, as well as the broader concept of violence against women in politics and its disproportionate impact on those from minority backgrounds. Characteristics particularly associated with Westminster parliaments such as adversarialism and conventions of parliamentary privilege are briefly introduced, along with the distinctive nature of the parliamentary workforce. Feminist institutionalism provides the theoretical framework for the overall argument—that in Australia parliamentary reform took longer than in other Westminster parliaments but that a combination of timing and local mobilisation created a critical juncture and powerful momentum. The chapter ends with an overview of the rest of the book.
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Cano, Amparo Elizabeth, Hassan Saif, Harith Alani e Enrico Motta. "Semantic Topic Compass – Classification Based on Unsupervised Feature Ambiguity Gradation". In The Semantic Web. Latest Advances and New Domains, 350–67. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-34129-3_22.
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Kosa, Victoria, Oles Dobosevych e Vadim Ermolayev. "Terminology Saturation Analysis: Refinements and Applications". In AI, Data, and Digitalization, 25–41. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53770-7_3.
Testo completoAbstract (sommario):
AbstractIn this paper, we outline the results of our recent research on terminology saturation analysis (TSA) in subject domain-bounded textual corpora. We present the developed TSA method. We further report about the two use cases that proved the validity, efficiency, and effectiveness of TSA. Based on our experience of TSA use, we analyse the shortcomings of the method and figure out the ways to refinement and improvement. Further, we share our prognoses on how TSA could be used for: (i) generating quality datasets of minimal size for training large language models for performing better in scientific domains; (ii) iteratively constructing domain ontologies and knowledge graphs that representatively describe a subject domain, or topic; or (iii) detecting and predicting events based on the TSA of textual streams data.
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Durst, Susanne, e Thomas Henschel. "Introduction to the Research Topic and Its Domains". In Small and Medium-Sized Enterprise (SME) Resilience, 3–16. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-50836-3_1.
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Schüttengruber, Victoria, Franciska Krings e Alexandra M. Freund. "Positive and Negative Spillover Effects: Managing Multiple Goals in Middle Adulthood". In Withstanding Vulnerability throughout Adult Life, 31–47. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-4567-0_3.
Testo completoAbstract (sommario):
AbstractBoth in the research literature as well as in popular media, the topic of “work-life” balance receives much attention, particularly for the age group of middle-aged adults. There is evidence for both, positive and negative spillover effects across life domains. This chapter provides a theoretical and empirical overview of the different types of inter-domain relationships, concepts of boundary management, and models of spillover effects on health and well-being. Adopting a lifespan perspective, we review the literature on spillover effects by focusing on multiple goal pursuit in the life domains of work, family, and leisure in middle adulthood. During this “rush hour” of life, middle-aged adults face the challenge of managing their scarce resources (e.g., time, energy) in order to achieve a successful “work-life balance.” Accordingly, we present empirical studies addressing the interplay between goal pursuit, boundary management, inter-domain conflict and facilitation, as well as spill- and crossover effects at the work-family interface. In addition, this chapter considers both exhaustion and recovery as key outcomes of spillover effects across life domains and highlights recommendations for boundary management in middle adulthood. Finally, this chapter outlines promising routes for future research on spillover effects between work, family, and leisure.
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Liu, Zhiyuan, e Maosong Sun. "Domain-Specific Term Rankings Using Topic Models". In Information Retrieval Technology, 454–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17187-1_44.
Testo completoAtti di convegni sul tema "Toric domains"
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Tang, Rui, e Cheng Yang. "A Cross-Domain Latent Topic Model for Item Tagging and Recommendation Systems". In 2024 International Conference on Culture-Oriented Science & Technology (CoST), 373–78. IEEE, 2024. http://dx.doi.org/10.1109/cost64302.2024.00080.
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Kim, Sejeong, Baek-Sik Son, Hee-Tae Jung e Yong-Hee Lee. "Generation of optical vortex array from Toric Focal Conic Domains (TFCDs)". In 2012 Opto-Electronics and Communications Conference (OECC). IEEE, 2012. http://dx.doi.org/10.1109/oecc.2012.6276389.
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Lin, Chen, Piush Kumar Singh, Yourong Xu, Eitan Lees, Rachna Saxena, Sasidhar Donaparthi e Hui Su. "Domain Adaptation Regularized LayoutLM with Automatic Domain Discovery from Topic Modelling". In 5th International Conference on Artificial Intelligence and Big Data. Academy & Industry Research Collaboration Center, 2024. http://dx.doi.org/10.5121/csit.2024.140422.
Testo completoAbstract (sommario):
In this paper, we propose using domain adaptation to improve the generalizability and performance of LayoutLM, a pre-trained language model that incorporates layout information of a document image. Our approach uses topic modelling to automatically discover the underlying domains in a document image dataset where domain information is unknown. We evaluate our approach on the challenging RVL-CDIP dataset and demonstrate that it significantly improves the performance of LayoutLM on this dataset. Our approach can be applied to other NLP models to improve their generalization capabilities, making them more applicable in real-world scenarios, where data is often collected from a variety of domains.
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Sun, Zhishu, Zhifeng Shen, Luojun Lin, Yuanlong Yu, Zhifeng Yang, Shicai Yang e Weijie Chen. "Dynamic Domain Generalization". In Thirty-First International Joint Conference on Artificial Intelligence {IJCAI-22}. California: International Joint Conferences on Artificial Intelligence Organization, 2022. http://dx.doi.org/10.24963/ijcai.2022/187.
Testo completoAbstract (sommario):
Domain generalization (DG) is a fundamental yet very challenging research topic in machine learning. The existing arts mainly focus on learning domain-invariant features with limited source domains in a static model. Unfortunately, there is a lack of training-free mechanism to adjust the model when generalized to the agnostic target domains. To tackle this problem, we develop a brand-new DG variant, namely Dynamic Domain Generalization (DDG), in which the model learns to twist the network parameters to adapt to the data from different domains. Specifically, we leverage a meta-adjuster to twist the network parameters based on the static model with respect to different data from different domains. In this way, the static model is optimized to learn domain-shared features, while the meta-adjuster is designed to learn domain-specific features. To enable this process, DomainMix is exploited to simulate data from diverse domains during teaching the meta-adjuster to adapt to the agnostic target domains. This learning mechanism urges the model to generalize to different agnostic target domains via adjusting the model without training. Extensive experiments demonstrate the effectiveness of our proposed method. Code is available: https://github.com/MetaVisionLab/DDG
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Zhao, Xingchen, Chang Liu, Anthony Sicilia, Seong Jae Hwang e Yun Fu. "Test-time Fourier Style Calibration for Domain Generalization". In Thirty-First International Joint Conference on Artificial Intelligence {IJCAI-22}. California: International Joint Conferences on Artificial Intelligence Organization, 2022. http://dx.doi.org/10.24963/ijcai.2022/240.
Testo completoAbstract (sommario):
The topic of generalizing machine learning models learned on a collection of source domains to unknown target domains is challenging. While many domain generalization (DG) methods have achieved promising results, they primarily rely on the source domains at train-time without manipulating the target domains at test-time. Thus, it is still possible that those methods can overfit to source domains and perform poorly on target domains. Driven by the observation that domains are strongly related to styles, we argue that reducing the gap between source and target styles can boost models’ generalizability. To solve the dilemma of having no access to the target domain during training, we introduce Test-time Fourier Style Calibration (TF-Cal) for calibrating the target domain style on the fly during testing. To access styles, we utilize Fourier transformation to decompose features into amplitude (style) features and phase (semantic) features. Furthermore, we present an effective technique to Augment Amplitude Features (AAF) to complement TF-Cal. Extensive experiments on several popular DG benchmarks and a segmentation dataset for medical images demonstrate that our method outperforms state-of-the-art methods.
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Chen, Cheng, Jesse Mullis e Beshoy Morkos. "A Topic Modeling Approach to Study Design Requirements". In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-72151.
Testo completoAbstract (sommario):
Abstract Risk management is vital to a product’s lifecycle. The current practice of reducing risks relies on domain experts or management tools to identify unexpected engineering changes, where such approaches are prone to human errors and laborious operations. However, this study presents a framework to contribute to requirements management by implementing a generative probabilistic model, the supervised latent Dirichlet allocation (LDA) with collapsed Gibbs sampling (CGS), to study the topic composition within three unlabeled and unstructured industrial requirements documents. As finding the preferred number of topics remains an open-ended question, a case study estimates an appropriate number of topics to represent each requirements document based on both perplexity and coherence values. Using human evaluations and interpretable visualizations, the result demonstrates the different level of design details by varying the number of topics. Further, a relevance measurement provides the flexibility to improve the quality of topics. Designers can increase design efficiency by understanding, organizing, and analyzing high-volume requirements documents in confirmation management based on topics across different domains. With domain knowledge and purposeful interpretation of topics, designers can make informed decisions on product evolution and mitigate the risks of unexpected engineering changes.
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Ding, Hantian, Jinrui Yang, Yuqian Deng, Hongming Zhang e Dan Roth. "Towards Open-Domain Topic Classification". In Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies: System Demonstrations. Stroudsburg, PA, USA: Association for Computational Linguistics, 2022. http://dx.doi.org/10.18653/v1/2022.naacl-demo.10.
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Huang, Peisong, Peijie Huang, Wencheng Ai, Jiande Ding e Jinchuan Zhang. "Latent Topic Attention for Domain Classification". In Interspeech 2019. ISCA: ISCA, 2019. http://dx.doi.org/10.21437/interspeech.2019-2228.
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Zahabi, Samira Tofighi, Somayeh Bakhshaei e Shahram Khadivi. "Using topic models in domain adaptation". In 2014 7th International Symposium on Telecommunications (IST). IEEE, 2014. http://dx.doi.org/10.1109/istel.2014.7000763.
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Kim, Sejeong, Baek-Sik Son, Hee-Tae Jung e Yong-Hee Lee. "Analysis of an Optical Vortex from Toric Focal Conic Domain". In Frontiers in Optics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/fio.2012.ftu3a.12.
Testo completoRapporti di organizzazioni sul tema "Toric domains"
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Durik, Amanda, Steven McGee, Linda Huber e Jennifer Duck. The Cat is Alive and Well: Curiosity Motivates Exploration for High Interest Learners. The Learning Partnership, aprile 2015. http://dx.doi.org/10.51420/conf.2015.1.
Testo completoAbstract (sommario):
Two studies were conducted to examine how individual interest predicts interactions with domain content and subsequent free-choice exploration. Particular focus was on learners’ acquisition of knowledge and identification of content that triggered curiosity. College student participants reported their individual interest, learned about a topic in ecology (Study 1, N = 85) and astronomy (Study 2, N = 184), responded to prompts for memory of the learning content and curiosity questions, and then had the opportunity to explore additional content related to the topic. In both studies individual interest interacted with whether students’ curiosity was triggered by particular content. In academic domains, individual interest in conjunction with curiosity may be the best predictor of continued behavioral exploration. The results are discussed in the context of the four-phase model of interest development.
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Baader, Franz, Stefan Borgwardt e Marcel Lippmann. Query Rewriting for DL-Lite with n-ary Concrete Domains (Extended Version). Technische Universität Dresden, 2017. http://dx.doi.org/10.25368/2022.234.
Testo completoAbstract (sommario):
We investigate ontology-based query answering (OBQA) in a setting where both the ontology and the query can refer to concrete values such as numbers and strings. In contrast to previous work on this topic, the built-in predicates used to compare values are not restricted to being unary. We introduce restrictions on these predicates and on the ontology language that allow us to reduce OBQA to query answering in databases using the so-called combined rewriting approach. Though at first sight our restrictions are different from the ones used in previous work, we show that our results strictly subsume some of the existing first-order rewritability results for unary predicates.
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Rafaeli, Ada, e Russell Jurenka. Molecular Characterization of PBAN G-protein Coupled Receptors in Moth Pest Species: Design of Antagonists. United States Department of Agriculture, dicembre 2012. http://dx.doi.org/10.32747/2012.7593390.bard.
Testo completoAbstract (sommario):
The proposed research was directed at determining the activation/binding domains and gene regulation of the PBAN-R’s thereby providing information for the design and screening of potential PBAN-R-blockers and to indicate possible ways of preventing the process from proceeding to its completion. Our specific aims included: (1) The identification of the PBAN-R binding domain by a combination of: (a) in silico modeling studies for identifying specific amino-acid side chains that are likely to be involved in binding PBAN with the receptor and; (b) bioassays to verify the modeling studies using mutant receptors, cell lines and pheromone glands (at tissue and organism levels) against selected, designed compounds to confirm if compounds are agonists or antagonists. (2) The elucidation ofthemolecular regulationmechanisms of PBAN-R by:(a) age-dependence of gene expression; (b) the effect of hormones and; (c) PBAN-R characterization in male hair-pencil complexes. Background to the topic Insects have several closely related G protein-coupled receptors (GPCRs) belonging to the pyrokinin/PBAN family, one with the ligand pheromone biosynthesis activating neuropeptide or pyrokinin-2 and another with diapause hormone or pyrokinin-1 as a ligand. We were unable to identify the diapause hormone receptor from Helicoverpa zea despite considerable effort. A third, related receptor is activated by a product of the capa gene, periviscerokinins. The pyrokinin/PBAN family of GPCRs and their ligands has been identified in various insects, such as Drosophila, several moth species, mosquitoes, Triboliumcastaneum, Apis mellifera, Nasoniavitripennis, and Acyrthosiphon pisum. Physiological functions of pyrokinin peptides include muscle contraction, whereas PBAN regulates pheromone production in moths plus other functions indicating the pleiotropic nature of these ligands. Based on the alignment of annotated genomic sequences, the primary and secondary structures of the pyrokinin/PBAN family of receptors have similarity with the corresponding structures of the capa or periviscerokinin receptors of insects and the neuromedin U receptors found in vertebrates. Major conclusions, solutions, achievements Evolutionary trace analysisof receptor extracellular domains exhibited several class-specific amino acid residues, which could indicate putative domains for activation of these receptors by ligand recognition and binding. Through site-directed point mutations, the 3rd extracellular domain of PBAN-R was shown to be critical for ligand selection. We identified three receptors that belong to the PBAN family of GPCRs and a partial sequence for the periviscerokinin receptor from the European corn borer, Ostrinianubilalis. Functional expression studies confirmed that only the C-variant of the PBAN-R is active. We identified a non-peptide agonist that will activate the PBAN-receptor from H. zea. We determined that there is transcriptional control of the PBAN-R in two moth species during the development of the pupa to adult, and we demonstrated that this transcriptional regulation is independent of juvenile hormone biosynthesis. This transcriptional control also occurs in male hair-pencil gland complexes of both moth species indicating a regulatory role for PBAN in males. Ultimate confirmation for PBAN's function in the male tissue was revealed through knockdown of the PBAN-R using RNAi-mediated gene-silencing. Implications, both scientific and agricultural The identification of a non-peptide agonist can be exploited in the future for the design of additional compounds that will activate the receptor and to elucidate the binding properties of this receptor. The increase in expression levels of the PBAN-R transcript was delineated to occur at a critical period of 5 hours post-eclosion and its regulation can now be studied. The mysterious role of PBAN in the males was elucidated by using a combination of physiological, biochemical and molecular genetics techniques.
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Wandeler, Christian, e Steve Hunt. The Fresno State Transportation Challenge. Mineta Transportation Institute, gennaio 2022. http://dx.doi.org/10.31979/mti.2022.2009.
Testo completoAbstract (sommario):
The Fresno State Transportation Challenge uses an action civics approach to support K-12 students in developing transportation-related projects that have a positive impact on the community. In 2020 the goal was to expand, refine, and create structures to sustain the implementation of the Transportation Challenge across subsequent years. As a result of the COVID pandemic, the process and goals of the project were adapted. The project was extended into April 2021 and was entirely conducted through remote participation. The focus was on two high schools. The expansion into the high school age bracket was successful and the experience with these two projects will allow for easier expansion in additional high schools in the future. One high school focused on the topic of active mobility, specifically biking, and addressed the challenge of how to get more students to bike to school. The other high school combined the transportation challenge with an economic vitalization project. The students were asked to also develop a modern transportation concept. Both projects exposed high school students to the topic of transportation and expanded awareness of transportation careers. Students also developed important competencies in the domains of problem solving, collaboration, communication, and leadership.
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Gurevitz, Michael, Michael E. Adams, Boaz Shaanan, Oren Froy, Dalia Gordon, Daewoo Lee e Yong Zhao. Interacting Domains of Anti-Insect Scorpion Toxins and their Sodium Channel Binding Sites: Structure, Cooperative Interactions with Agrochemicals, and Application. United States Department of Agriculture, dicembre 2001. http://dx.doi.org/10.32747/2001.7585190.bard.
Testo completoAbstract (sommario):
Integrated pest management in modern crop protection may combine chemical and biological insecticides, particularly due to the risks to the environment and livestock arising from the massive use of non-selective chemicals. Thus, there is a need for safer alternatives, which target insects more specifically. Scorpions produce anti-insect selective polypeptide toxins that are biodegradable and non-toxic to warm-blooded animals. Therefore, integration of these substances into insect pest control strategies is of major importance. Moreover, clarification of the molecular basis of this selectivity may provide valuable information pertinent to their receptor sites and to the future design of peptidomimetic anti-insect specific substances. These toxins may also be important for reducing the current overuse of chemical insecticides if they produce a synergistic effect with conventional pesticides. Based on these considerations, our major objectives were: 1) To elucidate the three-dimensional structure and toxic-site of scorpion excitatory, "depressant, and anti-insect alpha toxins. 2) To obtain an initial view to the sodium channel recognition sites of the above toxins by generating peptide decoys through a phage display system. 3) To investigate the synergism between toxins and chemical insecticides. Our approach was to develop a suitable expression system for toxin production in a recombinant form and for elucidation of toxin bioactive sites via mutagenesis. In parallel, the mode of action and synergistic effects of scorpion insecticidal toxins with pyrethroids were studied at the sodium channel level using electrophysiological methods. Objective 1 was achieved for the alpha toxin, LqhaIT Zilberberg et al., 1996, 1997; Tugarinov et al., 1997; Froy et al., 2002), and the excitatory toxin, Bj-xtrIT (Oren et al., 1998; Froy et al., 1999; unpublished data). The bioactive surface of the depressant toxin, LqhIT2, has been clarified and a crystal of the toxin is now being analyzed (unpublished). Objective 2 was not successful thus far as no phages that recognize the toxins were obtained. We therefore initiated recently an alternative approach, which is introduction of mutations into recombinant channels and creation of channel chimeras. Objective 3 was undertaken at Riverside and the results demonstrated synergism between LqhaIT or AaIT and pyrethroids (Lee et al., 2002). Furthermore, negative cross-resistance between pyrethroids and scorpion toxins (LqhaIT and AaIT) was demonstrated at the molecular level. Although our study did not yield a product, it paves the way for future design of selective pesticides by capitalizing on the natural competence of scorpion toxins to distinguish between sodium channels of insects and vertebrates. We also show that future application of anti-insect toxins may enable to decrease the amounts of chemical pesticides due to their synergism.
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McHugh, Grainne, Aidan Clerkin, Rachel Perkins e Rachel Cunningham. An in-depth analysis of the relative strengths and weaknesses of students in Ireland in mathematics and science in TIMSS 2019. Educational Research Centre, luglio 2024. http://dx.doi.org/10.70092/2091319.0724.
Testo completoAbstract (sommario):
This report draws on the Trends in International Mathematics and Science Study (TIMSS) 2019 data to explore the areas in mathematics and science where students in Ireland perform particularly strongly and areas where they do less well. It is aimed at informing the work of teachers, school leaders, teacher educators, and curriculum developers in Ireland. It describes, in detail, the performance of Fourth Class (primary) and Second Year (post-primary) students on a range of mathematics and science topics and on specific test items which are shown as presented to students in the test. Students’ performance is discussed with reference to relevant aspects of the Irish curricula for mathematics and science, and to international comparisons of student performance. The findings presented here build on previous findings from TIMSS 2019 in Ireland by providing a detailed examination of Fourth Class and Second Year students’ performance on the TIMSS content domains and, for the first time in detail, on their constituent subdomains and topic areas.
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Alonso-Robisco, Andres, Jose Manuel Carbo, Emily Kormanyos e Elena Triebskorn. Houston, we have a problem: can satellite information bridge the climate-related data gap? Madrid: Banco de España, settembre 2024. http://dx.doi.org/10.53479/37572.
Testo completoAbstract (sommario):
Central banks and international supervisors have identified the difficulty of obtaining climate information as one of the key obstacles to the development of green financial products and markets. To bridge this data gap, the use of satellite information from Earth Observation (EO) systems may be necessary. To better understand this process, we analyse the potential of applying satellite data to green finance. First, we summarise the policy debate from a central banking perspective. We then briefly describe the main challenges for economists in dealing with the EO data format and quantitative methodologies for measuring its economic materiality. Finally, using topic modelling, we perform a systematic literature review of recent academic studies to identify the research areas in which satellite data are currently being used in green finance. We find the following topics: physical risk materialisation (including both acute and chronic risk), deforestation, energy and emissions, agricultural risk and land use and land cover. We conclude with a comprehensive analysis on the financial materiality of this alternative data source, a mapping of these application domains to new green financial instruments and markets under development, such as thematic bonds or carbon credits, and some key considerations for policy discussion.
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Sela, Shlomo, e Michael McClelland. Investigation of a new mechanism of desiccation-stress tolerance in Salmonella. United States Department of Agriculture, gennaio 2013. http://dx.doi.org/10.32747/2013.7598155.bard.
Testo completoAbstract (sommario):
Low-moisture foods (LMF) are increasingly involved in foodborne illness. While bacteria cannot grow in LMF due to the low water content, pathogens such as Salmonella can still survive in dry foods and pose health risks to consumer. We recently found that Salmonella secretes a proteinaceous compound during desiccation, which we identified as OsmY, an osmotic stress response protein of 177 amino acids. To elucidate the role of OsmY in conferring tolerance against desiccation and other stresses in Salmonella entericaserovarTyphimurium (STm), our specific objectives were: (1) Characterize the involvement of OsmY in desiccation tolerance; (2) Perform structure-function analysis of OsmY; (3) Study OsmY expression under various growth- and environmental conditions of relevance to agriculture; (4) Examine the involvement of OsmY in response to other stresses of relevance to agriculture; and (5) Elucidate regulatory pathways involved in controlling osmY expression. We demonstrated that an osmY-mutant strain is impaired in both desiccation tolerance (DT) and in long-term persistence during cold storage (LTP). Genetic complementation and addition of a recombinantOsmY (rOsmY) restored the mutant survival back to that of the wild type (wt). To analyze the function of specific domains we have generated a recombinantOsmY (rOsmY) protein. A dose-response DT study showed that rOsmY has the highest protection at a concentration of 0.5 nM. This effect was protein- specific as a comparable amount of bovine serum albumin, an unrelated protein, had a three-time lower protection level. Further characterization of OsmY revealed that the protein has a surfactant activity and is involved in swarming motility. OsmY was shown to facilitate biofilm formation during dehydration but not during bacterial growth under optimal growth conditions. This finding suggests that expression and secretion of OsmY under stress conditions was potentially associated with facilitating biofilm production. OsmY contains two conserved BON domains. To better understand the role of the BON sites in OsmY-mediated dehydration tolerance, we have generated two additional rOsmY constructs, lacking either BON1 or BON2 sites. BON1-minus (but not BON2) protein has decreased dehydration tolerance compared to intact rOsmY, suggesting that BON1 is required for maximal OsmY-mediated activity. Addition of BON1-peptide at concentration below 0.4 µM did not affect STm survival. Interestingly, a toxic effect of BON1 peptide was observed in concentration as low as 0.4 µM. Higher concentrations resulted in complete abrogation of the rOsmY effect, supporting the notion that BON-mediated interaction is essential for rOsmY activity. We performed extensive analysis of RNA expression of STm undergoing desiccation after exponential and stationary growth, identifying all categories of genes that are differentially expressed during this process. We also performed massively in-parallel screening of all genes in which mutation caused changes in fitness during drying, identifying over 400 such genes, which are now undergoing confirmation. As expected OsmY is one of these genes. In conclusion, this is the first study to identify that OsmY protein secreted during dehydration contributes to desiccation tolerance in Salmonella by facilitating dehydration- mediated biofilm formation. Expression of OsmY also enhances swarming motility, apparently through its surfactant activity. The BON1 domain is required for full OsmY activity, demonstrating a potential intervention to reduce pathogen survival in food processing. Expression and fitness screens have begun to elucidate the processes of desiccation, with the potential to uncover additional specific targets for efforts to mitigate pathogen survival in desiccation.
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Alonso-Robisco, Andrés, José Manuel Carbó e José Manuel Carbó. Machine Learning methods in climate finance: a systematic review. Madrid: Banco de España, febbraio 2023. http://dx.doi.org/10.53479/29594.
Testo completoAbstract (sommario):
Preventing the materialization of climate change is one of the main challenges of our time. The involvement of the financial sector is a fundamental pillar in this task, which has led to the emergence of a new field in the literature, climate finance. In turn, the use of Machine Learning (ML) as a tool to analyze climate finance is on the rise, due to the need to use big data to collect new climate-related information and model complex non-linear relationships. Considering the proliferation of articles in this field, and the potential for the use of ML, we propose a review of the academic literature to assess how ML is enabling climate finance to scale up. The main contribution of this paper is to provide a structure of application domains in a highly fragmented research field, aiming to spur further innovative work from ML experts. To pursue this objective, first we perform a systematic search of three scientific databases to assemble a corpus of relevant studies. Using topic modeling (Latent Dirichlet Allocation) we uncover representative thematic clusters. This allows us to statistically identify seven granular areas where ML is playing a significant role in climate finance literature: natural hazards, biodiversity, agricultural risk, carbon markets, energy economics, ESG factors & investing, and climate data. Second, we perform an analysis highlighting publication trends; and thirdly, we show a breakdown of ML methods applied by research area.
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Cachalia, Firoz, e Jonathan Klaaren. Digitalisation, the ‘Fourth Industrial Revolution’ and the Constitutional Law of Privacy in South Africa: Towards a public law perspective on constitutional privacy in the era of digitalisation. Digital Pathways at Oxford, luglio 2021. http://dx.doi.org/10.35489/bsg-dp-wp_2021/04.
Testo completoAbstract (sommario):
In this working paper, our focus is on the constitutional debates and case law regarding the right to privacy, adopting a method that is largely theoretical. In an accompanying separate working paper, A South African Public Law Perspective on Digitalisation in the Health Sector, we employ the analysis developed here and focus on the specific case of digital technologies in the health sector. The topic and task of these papers lie at the confluence of many areas of contemporary society. To demonstrate and apply the argument of this paper, it would be possible and valuable to extend its analysis into any of numerous spheres of social life, from energy to education to policing to child care. In our accompanying separate paper, we focus on only one policy domain – the health sector. Our aim is to demonstrate our argument about the significance of a public law perspective on the constitutional right to privacy in the age of digitalisation, and attend to several issues raised by digitalisation’s impact in the health sector. For the most part, we focus on technologies that have health benefits and privacy costs, but we also recognise that certain technologies have health costs and privacy benefits. We also briefly outline the recent establishment (and subsequent events) in South Africa of a contact tracing database responding to the COVID-19 pandemic – the COVID-19 Tracing Database – a development at the interface of the law enforcement and health sectors. Our main point in this accompanying paper is to demonstrate the value that a constitutional right to privacy can bring to the regulation of digital technologies in a variety of legal frameworks and technological settings – from public to private, and from the law of the constitution to the ‘law’ of computer coding.