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Article
Publication date: 27 April 2010

David Nicholas, Ian Rowlands, Paul Huntington, Hamid R. Jamali and Patricia Hernández Salazar

The purpose of this paper is to present some of the results of the project “Evaluating the usage and impact of e‐journals in the UK”. The particular research reported here…

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Abstract

Purpose

The purpose of this paper is to present some of the results of the project “Evaluating the usage and impact of e‐journals in the UK”. The particular research reported here evaluated the use of the ScienceDirect journals database with regard to Life Sciences, Economics, Chemistry, Earth & Environmental Sciences and Physics by ten major UK research institutions. The aim of the study is to investigate researchers' digital behaviour, and to ascertain whether their use and behaviours varied by subjects and disciplines, or in relation to the institutions in which they worked.

Design/methodology/approach

Raw logs for ScienceDirect were obtained for the period January to April 2007, were subject to deep log techniques and analysed using the Software Package for Social Sciences (SPSS).

Findings

Typically, 5 per cent of the ScienceDirect journals viewed accounted for a third to half of all use. A high proportion of researchers entered the ScienceDirect site via a third‐party site, and this was especially so in the case of the Life Sciences and in the highest‐ranked research institutions. There were significant institutional and subject differences in information‐seeking behaviour. In the most research‐intensive institutions, per capita journal use was highest and their users spent much less time on each visit. There were significant differences of the order of 100‐300 per cent in the age of material viewed between subjects and institutions. Just four months after ScienceDirect content was opened to Google indexing, a third of traffic to the site's Physics journals came via that route.

Originality/value

The research is one of the very few studies to investigate subject and institutional differences with regard to the information seeking and use of UK researchers, something UK academic librarians should particularly welcome.

Details

Journal of Documentation, vol. 66 no. 3
Type: Research Article
ISSN: 0022-0418

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Publication date: 1 April 2004

Joshua M Price

Critical race theory is a contemporary legal movement composed of progressive scholars, primarily people who identify as people of color, who seek to challenge racism in American…

Abstract

Critical race theory is a contemporary legal movement composed of progressive scholars, primarily people who identify as people of color, who seek to challenge racism in American society. In their writing, they explore the many ways in which racism infuses American institutions, popular culture, commonsense beliefs, pervades interaction and cuts to the core of the American psyche. One of the central challenges that any person, scholar, activist faces in the U.S. is the peculiar nature of contemporary discourse on race. Often times, much of white America treats racism as if it were a thing of the past, an article of a time when the racial caste system was explicitly upheld and defended, either in the form of slavery, explicitly racist immigration laws (like the Chinese Exclusion Act), the Jim Crow laws, or when Native Americans were massacred by Union soldiers. Contemporary anti-racist work constantly confronts this denial of racism from a large segment of America.2 This denial of racism is one in which many people seem to have developed something of a psychic investment. Since the critical race theorists are working in a scholar-activist anti-racist vein, they also have to confront this massive self-delusion or mythic self-understanding.

Details

Studies in Law, Politics and Society
Type: Book
ISBN: 978-1-84950-262-7

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Article
Publication date: 30 April 2024

Ana Júlia Souto Carvalho, Jhonatan Rafael Zárate-Salazar, Michelle Cristine Medeiros Jacob, Patrícia Lima Araújo, Sávio Marcelino Gomes and Fillipe De Oliveira Pereira

This study aims to examine the role of edible mushrooms in the Brazilian diet, considering their strategic significance in meeting nutritional goals within sustainable…

134

Abstract

Purpose

This study aims to examine the role of edible mushrooms in the Brazilian diet, considering their strategic significance in meeting nutritional goals within sustainable development. Despite their potential in the nutrition of the Brazilian population, significant knowledge gaps still exist. To address this, the authors formulated this study into five main sections: the consumption of edible mushrooms in Brazil, the factors influencing the consumption, the occurrence of edible mushrooms in Brazil, the nutritional contribution of mushrooms consumed in Brazil and sustainable mushroom production in Brazil.

Design/methodology/approach

The authors compiled current literature to develop this viewpoint paper using systematic review, systematic search and narrative review search methods.

Findings

Mushrooms are sporadically consumed in Brazil, primarily by the urban population, with challenges in estimating the most used species. Social, economic and cultural factors, health considerations and reduced meat consumption influence mushroom consumption behavior. While Pleurotus ostreatus, Lentinula edodes and Agaricus bisporus are primary species, ethnomycological studies highlight a more diverse consumption among traditional indigenous communities. Brazil hosts approximately 133 wild mushroom species safe for human consumption. Some can be sustainably cultivated using substrates derived from agricultural and urban waste, offering high-protein, high-fiber, low-fat foods with bioactive compounds holding antioxidant and prebiotic potential.

Originality/value

To the best of the authors’ knowledge, no previous study has investigated how edible mushrooms contribute to the food and nutrition of the Brazilian population. This study emphasizes the crucial role of edible mushrooms in preserving Brazil’s cultural heritage, contributing to food and nutritional security and enhancing the overall diet quality.

Details

Nutrition & Food Science , vol. 54 no. 4
Type: Research Article
ISSN: 0034-6659

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Book part
Publication date: 6 May 2008

Alan R. Sandstrom

Nahua ritual specialists of northern Veracruz, Mexico, portray spirit entities by cutting their images from paper. Paper cutting is an ancient craft in Mesoamerica that traces…

Abstract

Nahua ritual specialists of northern Veracruz, Mexico, portray spirit entities by cutting their images from paper. Paper cutting is an ancient craft in Mesoamerica that traces back to the pre-Hispanic era. The impetus to materialize the spirits in this way is the result of the highly abstract and pantheistic nature of the Nahua religious system. In pantheistic thought, the cosmos itself is the deity and all apparent diversity can be seen as different aspects or manifestations of a seamless sacred unity. The Nahua ritual specialist places the paper figures on elaborate altars where he or she dedicates special offerings to them. The fundamentally economic nature of Nahua ritual exchange is revealed – with the aid of ritual economy – through examination of multiple factors: the symbolic meanings of sacred chanting and altar construction, the role of religion in constituting Nahua ethnic identity in the face of domination by mestizo elites, and the ecological context that renders life precarious for indigenous horticulturalists of this region of Mexico.

Details

Dimensions of Ritual Economy
Type: Book
ISBN: 978-1-84950-546-8

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Article
Publication date: 11 June 2020

José Francisco Villarreal Valderrama, Luis Takano, Eduardo Liceaga-Castro, Diana Hernandez-Alcantara, Patricia Del Carmen Zambrano-Robledo and Luis Amezquita-Brooks

Aircraft pitch control is fundamental for the performance of micro aerial vehicles (MAVs). The purpose of this paper is to establish a simple experimental procedure to calibrate…

245

Abstract

Purpose

Aircraft pitch control is fundamental for the performance of micro aerial vehicles (MAVs). The purpose of this paper is to establish a simple experimental procedure to calibrate pitch instrumentation and classical control algorithms. This includes developing an efficient pitch angle observer with optimal estimation and evaluating controllers under uncertainty and external disturbances.

Design/methodology/approach

A wind tunnel test bench is designed to simulate fixed-wing aircraft dynamics. Key elements of the instrumentation commonly found in MAVs are characterized in a gyroscopic test bench. A data fusion algorithm is calibrated to match the gyroscopic test bench measurements and is then integrated into the autopilot platform. The elevator-angle to pitch-angle dynamic model is obtained experimentally. Two different control algorithms, based on model-free and model-based approaches, are designed. These controllers are analyzed in terms of parametric uncertainties due to wind speed variations and external perturbation because of sudden weight distribution changes. A series of experimental tests is performed in wind-tunnel facilities to highlight the main features of each control approach.

Findings

With regard to the instrumentation algorithms, a simple experimental methodology for the design of optimal pitch angle observer is presented and validated experimentally. In the context of the platform design and identification, the similitude among the theoretical and experimental responses shows that the platform is suitable for typical pitch control assessment. The wind tunnel experiments show that a fixed linear controller, designed using classical frequency domain concepts, is able to provide adequate responses in scenarios that approximate the operation of MAVs.

Research limitations/implications

The aircraft orientation observer can be used for both pitch and roll angles. However, for simultaneousyaw angle estimation the proposed design method requires further research. The model analysis considers a wind speed range of 6-18 m/s, with a nominal operation of 12 m/s. The maximum experimentally tested reference for the pitch angle controller was 20°. Further operating conditions may require more complex control approaches (e.g. scheduling, non-linear, etc.). However, this operating range is enough for typical MAV missions.

Originality/value

The study shows the design of an effective pitch angle observer, based on a simple experimental approach, which achieved locally optimum estimates at the test conditions. Additionally, the instrumentation and design of a test bench for typical pitch control assessment in wind tunnel facilities is presented. Finally, the study presents the development of a simple controller that provides adequate responses in scenarios that approximate the operation of MAVs, including perturbations that resemble package delivery and parametric uncertainty due to wind speed variations.

Details

Aircraft Engineering and Aerospace Technology, vol. 92 no. 7
Type: Research Article
ISSN: 1748-8842

Keywords

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Book part
Publication date: 27 September 2019

Cristina Salazar Gallardo and Consuelo Murillo

Latin American countries have encountered multiple challenges to implement meaningful transformations to their national educational systems (Baten, 2016). Through a mixed-methods…

Abstract

Latin American countries have encountered multiple challenges to implement meaningful transformations to their national educational systems (Baten, 2016). Through a mixed-methods approach (Maxwell, 1992), this chapter aims to present the significance of professional development for teachers and principals in public schools in Latin America. Specifically, the authors explore the significance of professional development that allows these educators to develop a student-centered approach (Gibbs, 1981) in their daily work.

By presenting qualitative and quantitative data from three programs implemented by the non-profit organization Educando by Worldfund, this chapter seeks to showcase how the challenges that Latin America currently faces can be improved through a methodology that focuses on building capacity and that helps educators with concrete practices to foster a student-centered approach in their practice.

The findings in this study showcase the significance of educational interventions that are grounded and tailored to the sociopolitical context in which they will be implemented and it will also posit that, according to the authors’ findings, the students in public schools feel empowered and motivated after their teachers and principals participate in one of these three programs. The larger impact from the cases explored in this chapter will hopefully contribute to a larger conversation regarding how to implement public policies that can empower principals and teachers across Latin America.

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Book part
Publication date: 6 May 2008

Patricia A. McAnany

The most powerful and effective forces of hierarchizing are those that naturalize difference so that it is beyond dispute and something to be tacitly accepted. In the Classic Maya…

Abstract

The most powerful and effective forces of hierarchizing are those that naturalize difference so that it is beyond dispute and something to be tacitly accepted. In the Classic Maya world, this “social speciation” was materialized and naturalized through a complex web of ritual practice, deity emulation, enhancement of body aesthetics, and the fabrication and possession of hypertrophic goods. The architecture of Classic Maya royal courts broke with an older Maya residential pattern of accretional construction filled with ancestral burials in order to materialize more effectively social difference, to provide space for exclusive ritual performance, and to showcase the highly valued and gendered labor of textile production. Such instruments of authority are “weapons of exclusion” that can be wielded to fend off assaults on hierarchy. From this perspective, informed by the ritual economy approach, the profound transformations of the 9th century in the Maya lowlands are considered an assault that was not defendable.

Details

Dimensions of Ritual Economy
Type: Book
ISBN: 978-1-84950-546-8

Available. Content available
Book part
Publication date: 11 May 2007

Abstract

Details

Education for All
Type: Book
ISBN: 978-0-7623-1441-6

Available. Content available
Article
Publication date: 1 February 2016

24

Abstract

Details

Personnel Review, vol. 45 no. 1
Type: Research Article
ISSN: 0048-3486

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Book part
Publication date: 3 July 2007

Edward J. McCaughan

This paper presents a comparative analysis of artwork produced in the context of social movements waged by Mexicans and Chicanos (U.S. inhabitants of Mexican descent) during the…

Abstract

This paper presents a comparative analysis of artwork produced in the context of social movements waged by Mexicans and Chicanos (U.S. inhabitants of Mexican descent) during the two decades between the mid-1960s and the mid-1980s. Despite the fact that activists in these movements shared many elements of Mexican culture and history, were part of the same generation of radical social movements born in the 1960s, and experienced some significant interchange among movement participants from each side of the U.S.-Mexico border, an examination of movement art reveals significant differences in key elements of the movements’ collective identity and expression of political citizenship. Analysis of the artwork also highlights different aesthetic choices made by movement artists, particularly with regard to the deployment of formal elements associated with the “Mexican School” of art made famous by artists associated with the Mexican Revolution of the early 20th century. Variations in the representational strategies developed by movement artists reflect the distinct relationship of movement constituents in Mexico and the U.S. to each nation's prevailing regimes of accumulation and modes of regulation. The analysis is based on an examination of 374 pieces of art.

Details

Research in Social Movements, Conflicts and Change
Type: Book
ISBN: 978-0-7623-1318-1

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