Search results

1 – 10 of 108
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 3 February 2023

Josué Costa-Baptista, Edith Roland Fotsing, Jacky Mardjono, Daniel Therriault and Annie Ross

The purpose of this paper is the design and experimental investigation of compact hybrid sound-absorbing materials presenting low-frequency and broadband sound absorption.

184

Abstract

Purpose

The purpose of this paper is the design and experimental investigation of compact hybrid sound-absorbing materials presenting low-frequency and broadband sound absorption.

Design/methodology/approach

The hybrid materials combine microchannels and helical tubes. Microchannels provide broadband sound absorption in the middle frequency range. Helical tubes provide low-frequency absorption. Optimal configurations of microchannels are used and analytical equations are developed to guide the design of the helical tubes. Nine hybrid materials with 30 mm thickness are produced via additive manufacturing. They are combinations of one-, two- and four-layer microchannels and helical tubes with 110, 151 and 250 mm length. The sound absorption coefficient of the hybrid materials is measured using an impedance tube.

Findings

The type of microchannels (i.e. one, two or four layers), the number of rotations and the number of tubes are key parameters affecting the acoustic performance. For instance, in the 500 Hz octave band (α500), sound absorption of a 30 mm thick hybrid material can reach 0.52 which is 5.7 times higher than the α500 of a typical periodic porous material with the same thickness. Moreover, the broadband sound absorption for mid-frequencies is reasonably high with and α1000 > 0.7. The ratio of first absorption peak wavelength to structure thickness λ/T can reach 17, which is characteristic of deep-subwavelength behaviour.

Originality/value

The concept and experimental validation of a compact hybrid material combining a periodic porous structure such as microchannels and long helical tubes are original. The ability to increase low-frequency sound absorption at constant depth is an asset for applications where volume and weight are constraints.

Details

Rapid Prototyping Journal, vol. 29 no. 6
Type: Research Article
ISSN: 1355-2546

Keywords

Access Restricted. View access options
Article
Publication date: 23 January 2020

Dorothy Kass and Martin Sullivan

Originally written in the 1990s but unpublished, the paper is now revised; the purpose of this paper is to examine the context of the formation of the Educational Workers League…

128

Abstract

Purpose

Originally written in the 1990s but unpublished, the paper is now revised; the purpose of this paper is to examine the context of the formation of the Educational Workers League of NSW in 1931 with particular emphasis on the NSW Crown Employees (Teachers) Conciliation Committee and the enactment of its agreement in the worsening economic conditions of the Depression. The aims, reception and possible influence of the League on Federation policy and practice are addressed.

Design/methodology/approach

Primary source material consulted includes the minutes of the Conciliation Committee’s sittings from September 1927 to July 1929; papers relating to the Educational Workers League held in the Teachers Federation Library; and the Teachers Federation journal, Education.

Findings

The Conciliation Committee’s proceedings and outcomes had far reaching implications. The resultant salary agreement received a hostile reception from assistant teachers and fuelled distrust between assistants and headmasters. As economic depression deepened, dissatisfaction with the conservative leadership and tactics of the Federation increased. One outcome was the formation of the radical, leftist Educational Workers League by teachers, including Sam Lewis, who would later play key roles within the Federation itself.

Originality/value

While acknowledging the extensive earlier work of Bruce Mitchell, the paper contributes to a deeper understanding of teacher unionism and teacher activism in the 1920s and 1930s. Apart from brief attention by Federation historians in the 1960s and 1970s, there has been no history of the formation, reception and significance of the Educational Workers League.

Access Restricted. View access options
Book part
Publication date: 1 July 2017

Peter K. Ross, Susan Ressia and Elizabeth J. Sander

Abstract

Details

Work in the 21st Century
Type: Book
ISBN: 978-1-78714-578-8

Available. Content available
Book part
Publication date: 1 July 2017

Peter K. Ross, Susan Ressia and Elizabeth J. Sander

Free Access. Free Access

Abstract

Details

Work in the 21st Century
Type: Book
ISBN: 978-1-78714-578-8

Access Restricted. View access options
Book part
Publication date: 15 November 2018

Bev Orton

During the apartheid era many women, such as Albertina Sisulu and Lilian Ngoyi to name only two, spent time in solitary confinement. Women were punished for taking part in…

Abstract

During the apartheid era many women, such as Albertina Sisulu and Lilian Ngoyi to name only two, spent time in solitary confinement. Women were punished for taking part in political activities by being issued with banning orders or placed under house arrest. Women placed under banning orders were treated differently to men. At the Special Hearings which were organised by the Truth and Reconciliation Commission (TRC) women were provided with an opportunity to talk about their experiences as women living under apartheid instead of talking about what had happened to someone in their family. The silencing of women continued even after the new government came to power. This is clearly illustrated in the negligible space allotted to the experiences of women’s oppression and human rights violations in the hearings before the TRC. My concern that an understanding and appreciation of the suffering, oppression, political activism and contribution by South African women during apartheid will be lost to future generations is shared by Annie Coombes’s statement in her book History After Apartheid: Visual Culture and Public Memory in a Democratic South Africa (2003).

Details

Women, Activism and Apartheid South Africa: Using Play Texts to Document the Herstory of South Africa
Type: Book
ISBN: 978-1-78754-526-7

Access Restricted. View access options
Article
Publication date: 1 December 2002

Tessa Trappes‐Lomax, Annie Ellis and Mary Fox

This is the third in a series of articles about trying to develop better evidence for a service on the health/social care interface. All are based on our experiences of carrying…

38

Abstract

This is the third in a series of articles about trying to develop better evidence for a service on the health/social care interface. All are based on our experiences of carrying out a comparative study of residential rehabilitation for older people. The first two dealt with methodology and implementation. Now we reflect on the completion of the project and the first stages of dissemination.

Details

Journal of Integrated Care, vol. 10 no. 6
Type: Research Article
ISSN: 1476-9018

Keywords

Access Restricted. View access options
Article
Publication date: 26 August 2024

Paula R. Dempsey, Glenda M. Insua, Annie R. Armstrong, Holly Joy Hudson, Kristyn Caragher and Mariah McGregor

This analysis of chat reference transcripts assesses differences in how librarians and graduate assistants (GAs) incorporate teaching strategies in responding to chat reference…

107

Abstract

Purpose

This analysis of chat reference transcripts assesses differences in how librarians and graduate assistants (GAs) incorporate teaching strategies in responding to chat reference inquiries in social sciences, health sciences, humanities, STEM and business/economics at a large, public R1 university in the United States.

Design/methodology/approach

Researchers with disciplinary assignments in five different subject domains conducted qualitative analysis of a purposive sample of 982 transcripts of chat interactions during four semesters in 2021 and 2022.

Findings

Some form of information literacy instruction (ILI) occurred in 58% of the transcripts, with slightly less teaching occurring in social sciences inquiries than in other subject areas. Of transcripts that included teaching strategies, search procedures predominated, followed by a mix of concepts and procedures, and the least with concepts only. Chat providers taught concepts specific to social sciences, health sciences and humanities, but not to STEM or business.

Research limitations/implications

The study compares transcripts at one institution; findings may be most applicable to large, research institutions that seek to incorporate ILI in online reference services.

Practical implications

Chat reference training should include best practices for ILI relevant to specific subject domains for providers without background in those disciplines and recommendations for referrals to subject specialists.

Originality/value

Existing ILI literature does not address the question of how chat providers teach concepts rooted in a specific subject domain or offer a comparison of teaching strategies employed in different disciplines, by librarians versus GAs or staff.

Access Restricted. View access options
Article
Publication date: 1 June 2001

Tessa Trappes‐Lomax and Annie Ellis

This is the first of two articles about evaluating a residential rehabilitation service for older people. It highlights some key principles about research on the health/social…

54

Abstract

This is the first of two articles about evaluating a residential rehabilitation service for older people. It highlights some key principles about research on the health/social care interface, which may be useful to others doing similar work. Here we describe the methodology and how it was chosen. In the next article we will discuss the baseline data findings.

Details

Journal of Integrated Care, vol. 9 no. 3
Type: Research Article
ISSN: 1476-9018

Access Restricted. View access options
Article
Publication date: 1 January 1983

Janet L. Sims‐Wood

Life studies are a rich source for further research on the role of the Afro‐American woman in society. They are especially useful to gain a better understanding of the…

313

Abstract

Life studies are a rich source for further research on the role of the Afro‐American woman in society. They are especially useful to gain a better understanding of the Afro‐American experience and to show the joys, sorrows, needs, and ideals of the Afro‐American woman as she struggles from day to day.

Details

Reference Services Review, vol. 11 no. 1
Type: Research Article
ISSN: 0090-7324

Access Restricted. View access options
Article
Publication date: 6 September 2011

Kamy Ooi and Chern Li Liew

This study seeks to examine, from the viewpoint of 12 adult fiction readers who are members of book clubs, how they go about selecting fiction books to borrow from the public…

3499

Abstract

Purpose

This study seeks to examine, from the viewpoint of 12 adult fiction readers who are members of book clubs, how they go about selecting fiction books to borrow from the public library.

Design/methodology/approach

Each participant took part in an individual, semi‐structured, face‐to‐face interview. Using Williamson's Ecological Model of Information Seeking and Use as the conceptual framework, the study examined the role that fiction readers' “internal environments” and “external contexts” played in their book choices.

Findings

The selection of fiction books at the public library occurred, to a large extent, outside it. Fiction books were selected as part of everyday life information seeking, influenced by study participants' personal characteristics and circumstances as well as sources from their everyday lives, which typically included family, friends, book club and the mass media. While the public library was the main means by which study participants obtained their fiction books, it was not the first source to which they turned for ideas on what to read.

Originality/value

The study moves from a preoccupation of readers' actions at the public library to examine, more holistically, how everyday life information sources influence their choices of fiction books at the public library. It highlights the purposive and serendipitous dimensions of book selections and also underscores the importance of recognizing trust as a determining factor in book selection.

Details

Journal of Documentation, vol. 67 no. 5
Type: Research Article
ISSN: 0022-0418

Keywords

1 – 10 of 108
Per page
102050