Topological domain states and magnetoelectric properties in multiferroic nanostructures

Multiferroic nanostructures have been attracting tremendous attention over the past decade, due to their rich cross-coupling effects and prospective electronic applications. In particular, the emergence of some exotic phenomena in size-confined multiferroic systems, including topological domain states such as vortices, center domains, and skyrmion bubble domains, has opened a new avenue to a number of intriguing physical properties and functionalities, and thus underpins a wide range of applications in future nanoelectronic devices. It is also highly appreciated that nano-domain engineering provides a pathway to control the magnetoelectric properties, which is promising for future energy-efficient spintronic devices. In recent years, this field, still in its infancy, has witnessed a rapid development and a number of challenges too. In this article, we shall review the recent advances in the emergent domain-related exotic phenomena in multiferroic nanostructures. Specific attention is paid to the topological domain structures and related novel physical behaviors as well as the electric-field-driven magnetic switching via domain engineering. This review will end with a discussion of future challenges and potential directions.     

Superintendent’s leadership: the cultural aspects of the role enactment

This qualitative study seeks to create a better understanding of the work of school superintendents. This study was conducted using ethnographic techniques as a way to describe the practice of a Latino superintendent in a borderland community in south Texas. Guiding questions for this study were: What goes on in the workday life of a superintendent? and how does the superintendent enact his role as superintendent? Field study for this qualitative inquiry occurred over a period of seven months. Data for this study, including transgressive data, were collected primarily through participant observations, semi-structured ethnographic interviews, from artefacts and journal notes.     

Learning to select the correct answer in multi-stream question answering

Question answering (QA) is the task of automatically answering a question posed in natural language. Currently, there exists several QA approaches, and, according to recent evaluation results, most of them are complementary. That is, different systems are relevant for different kinds of questions. Somehow, this fact indicates that a pertinent combination of various systems should allow to improve the individual results. This paper focuses on this problem, namely, the selection of the correct answer from a given set of responses corresponding to different QA systems. In particular, it proposes a supervised multi-stream approach that decides about the correctness of answers based on a set of features that describe: (i) the compatibility between question and answer types, (ii) the redundancy of answers across streams, as well as (iii) the overlap and non-overlap information between the question–answer pair and the support text. Experimental results are encouraging; evaluated over a set of 190 questions in Spanish and using answers from 17 different QA systems, our multi-stream QA approach could reach an estimated QA performance of 0.74, significantly outperforming the estimated performance from the best individual system (0.53) as well as the result from best traditional multi-stream QA approach (0.60).     

Stereotyped Identification: How Identifying with Fictional Latina Characters Increases Acceptance and Stereotyping

This article applies the concept of stereotyped identification—the idea that cognitively and emotionally identifying with fictional minority characters can simultaneously increase acceptance of minorities while reinforcing stereotypes about how they look, act, and talk—to the context of Latina television characters. Specifically, we employed a national survey measuring participants’ exposure to Latina TV characters; levels of identification with TV characters; and attitudes toward, and stereotypes about, Latinas. Results are consistent with the prediction that through identification, exposure to Latina TV characters is related to more favorable feelings toward Latinas, as well as higher levels of stereotyped views of Latinas as sexualized and melodramatic.     

Does students’ heritage matter in their performance on and perceptions of historical reasoning tasks?

This mixed methods study explores how high school students (N = 35) enrolled in a US charter school with a high Latino/a population perform on and perceive (in terms of interest and relevance) document-based type historical reasoning tasks: one about the Dust Bowl in the 1930s and the other about the experiences of Mexicans and Mexican Americans in the 1920s. Students wrote essay responses and completed perception inventories about the tasks. We also interviewed 10 focal students to delve more deeply into students’ thinking regarding the tasks and their interest levels in the two topics. We scored students’ responses along the criteria of historical claims, substantiation of claims, use of evidence from documents, sourcing of documents and contextualization. Our hypotheses were that students would perform better on, and be more interested in, tasks that were culturally relevant to them. We found that although students did not perform differently on the two tasks overall, students’ perceptions of the tasks differed, with a significantly greater interest in the task about Mexicans and Mexican Americans. We address the complexity of these findings and discuss implications for curriculum and practise.     

History of Spanish Mathematics Education Focusing on PhD Theses

This article offers an overview of mathematics education in Spain, analyzing the production of PhD theses over the last 30 years. This period has been divided into four cycles that describe the evolution of Spanish research in the field of mathematics education, together with changes in university and social politics. This paper also includes a forecast of the number of theses that will be produced over the next 7 years, thus predicting the future progress and development of this area of research.