Search results

Mechanical properties testing of the hyperelastic thermoplastic polyurethane (TPU) produced by the continuous digital light processing (CDLP) method of additive manufacturing. Primarily, this paper aims to verify that 3D printed TPU still satisfies commonly assumed volumetric incompressibility and material isotropy in elastic range. The secondary aim is to investigate the accuracy and reproducibility of the CDLP method.

Cylindrical samples were printed and subjected to a volumetric compression test to reveal their bulk modulus K and maximal theoretical porosity (MTP). Dog bone specimens were oriented along different axes and printed. Their dimensions were measured, and they were subjected to cyclic uniaxial tests up to 100% strain to reveal the level of stress softening and possible anisotropy. The hyperelastic Yeoh model was fitted to the mean response.

The authors measured the bulk modulus of K = 1851 ± 184 MPa. The mean MTP was 0.9 ± 0.5%. The mean response was identical in both directions and the data could be fitted by the isotropic third order Yeoh function with R^2 = 0.996. The dimensions measurement revealed the largest error (above 5%) in the direction perpendicular to the direction of the digital light projection while the dimensions in other two dimensions were much more accurate (0.75 and 1%, respectively).

The TPU printed by CDLP can be considered and modelled as isotropic and practically volumetrically incompressible. The parts in the printing chamber should be positioned in a way that the important dimensions are not parallel to the direction of the digital light projection.

The authors experimentally confirmed the volumetric incompressibility and mechanical isotropy of the TPU printed using the CDLP method.

The purpose of this article is to give an overview of scholarly monographs on rock music from 1980 to the present. It aims to provide an overview to the literature for practical purposes of collection development as well as giving the reader insight into key issues and trends related to a interdisciplinary topic that attracts scholars from many disciplines in the humanities and social sciences.

This bibliographic essay, focusing on works related to American culture and of a general nature, includes an overview and historical background; a discussion of how music and ethnomusiciological scholars approach the topic; geographic approaches; literature on four key icons (Elvis, Dylan, Springsteen, and Madonna); American studies; subcultures and genres; other methodologies; and concludes by discussing notable recent works.

The scholarly literature on rock incorporates a wide variety of approaches and methodologies. Many music‐related scholars appropriate methodology from other disciplines and some non‐music‐related scholars use the formalistic analysis of music scholars. Authenticity is a major theme in the literature on rock.

This essay covers the widest range of monographs on the topic, providing insight into not only the key scholars but also the diversity of approaches to the topic. The historical approach to the literature gives the reader a sense of how the academic discourse on rock has evolved. This essay is of interest to librarians, scholars of rock music, and others concerned with how American scholarship in the humanities and the social sciences has grown since the advent of cultural studies.

The Australian Football League (AFL) is the premier sporting competition in Australia in terms of capital outlay, breadth of industry associations, public consumption, and arguably cultural significance. The AFL competition is now a domain of specialisations and interests, which provides vast opportunity for both sporting and non-sporting institutions seeking to utilise the game to capitalise on a society of consumption, entertainment and risk. AFL officials expect high standards of their players both on and off the field. These standards are expressed in various forms of Codes and Policies. Off field player misconduct is an ongoing concern not escaping media attention, which is a resounding indication more needs to be done by the AFL to improve responsible player character development. Whether the current education programmes are sufficient to meet the AFL’s own expectations is the central issue addressed in this chapter. As it stands AFL governance is deficient on several counts. In this chapter I will focus on three governance deficiencies: firstly, the AFL Illicit Drug Policy (IDP) contains unnecessary inconsistencies relative to its primary purpose; secondly, the present measures undertaken to ensure players have appropriate education to achieve the expected character development are far from efficacious and so arguably can be vastly improved; and thirdly, the promotion of live-odds gambling during televised games is culturally problematic and inconsistent with its own demands. The ethical grounds central to this investigation are ‘fairness’ and ‘cultural influence’. In order to resolve some of its governance concerns I will explain why the AFL should be characterised as a practice-community and as such should adopt a comprehensive virtue and value-based compliance ethical education programme consistent with its own vision and conduct expectation of its players and officials. I will argue that the AFL as a practice community is much more than simply a game, given its cultural influence, commercial associations and community programmes.

To review the literature and identify research gaps in the role and influence boards of directors of companies have in occupational health and safety (OHS).

This was done in a scoping review built on a structured search in MEDLINE (PubMed), EMBASE, PsycINFO, Sociological Abstracts, CCInfoWeb, EconLit, Web of Science, CINAHL and gray literature. Citations and reference lists were tracked. Inclusion criteria were publication in English. Exclusion criteria were studies covering companies using subcontractors to arrange OHS, or with <250 employees.

Forty-nine studies were included. The majority contained empirical data (n = 28; 57%), some were entirely normative (n = 16; 33%), and a few contained normative claims far beyond empirical data (n = 5; 10%). Empirical studies gave no insight into the scope of impact of board activities on OHS, and no studies assess the causal mechanisms by which board activities influence OHS outcomes. Most studies focused on both health and safety (n = 20; 41%) or only safety (n = 15; 31%). Context might explain the focus on safety rather than health, but is not clearly elucidated by the studies. Several studies are describing leadership behavior, although not framed as such. A narrative summary is presented to facilitate future research.

Future research should include: (1) which board activities influence OHS, (2) how board activities influence OHS, (3) the influence of context and (4) the leadership role of boards of directors.

This study identifies a total lack of research on the basic mechanics of the relationship between boards and OHS.

Organizational change in an evolving technological age is reconsidered here. Extant organization theory focuses largely on technologically‐induced transformation. This paper argues that this focus is inappropriate. With the proliferation of information technology in the workplace, change literature propounds a particular view of the organization: a lean, flat and networked organization. Reevaluating future change and future shock literature prediction, we establish a more realistic account of technology and the organization and question the accuracy of the “altered organization” expectation. In developing a conceptualization of a “limited reality of change,” we imply that predicted changes are not as clear cut as certain proponents would have us believe. Though there is a willingness throughout technology change literature to slip into the language of organizational transformation, this paper indicates that the reality of change is far more restrictive than has largely been previously acknowledged We conclude by proposing the coexistent organization as an alternative—arguing that hierarchical organizational forms can coexist with a networked organization—and discuss implications for organization change theory.

The purpose of this paper was to assess two different leader development interventions by comparing their effects on leadership behaviour and evaluating their combined impact after two years, from the viewpoints of both the participating managers and external raters.

The study was a longitudinal randomised controlled trial with a cross-over design. Health care managers (n = 177) were first randomised to either of two 10-month interventions and a year later were switched to the other intervention. Leadership behaviour was rated at pre-test and 12 and 24 months by participating managers and their superiors, colleagues and subordinates using a 360-degree instrument. Analysis of variance and multilevel regression analysis was performed.

No difference in effect on leadership behaviour was found between the two interventions. The evaluation of the combined effect of the interventions on leadership behaviour showed inconsistent (i.e. both increased and decreased) ratings by the various rater sources.

This study provides some evidence that participation in leadership development programmes can improve managers’ leadership behaviours, but the results also highlight the interpretive challenges connected with using a 360-degree instrument to evaluate such development.

The longitudinal randomised controlled design and the large sample comprising both managers and external raters make this study unusually rigorous in the field of leadership development evaluations.

The purpose of this study is to investigate the relationship between leadership profiles and differences in managers’ own levels of work stress symptoms and perceptions of work stressors causing stress.

Cross-sectional data were used. Healthcare managers (n = 188) rated three dimensions of their leadership behavior and levels of work stressors and stress. Hierarchical cluster analysis was performed to identify leadership profiles based on leadership behaviors. Differences in stress-related outcomes between profiles were assessed using one-way analysis of variance.

Four distinct clusters of leadership profiles were found. They discriminated in perception of work stressors and stress: the profile distinguished by the lowest mean in all behavior dimensions, exhibited a pattern with significantly more negative ratings compared to the other profiles.

This paper proposes that leadership profile is an individual factor involved in the stress process, including work stressors and stress, which may inform targeted health promoting interventions for healthcare managers.

This is the first study to investigate the relationship between leadership profiles and work stressors and stress in healthcare managers.

The purpose of this paper is to examine and synthesize Argyris and Schön's Theory of Action and Kegan and Lahey's theory of Immunity to Change in order to produce an integrated model.

Literature discussing Argyris and Schön's Theory of Action (Model I and Model II), single and double‐loop learning, espoused theory and theory‐in‐use; and Kegan and Lahey's theory of Immunity to Change was examined. The two theories were then summarized, analyzed, compared and synthesized into an integrated model.

Within Kegan and Lahey's model of an immunity system, the Argyris and Schön Model I Unilateral Control Model should be considered a competing commitment. Kegan and Lahey's theory identifies a critical causal element (underlying assumption) not previously identified by the Argyris and Schön Theory of Action, thus opening the potential for expanded effectiveness by practioners of Argyris and Schön's theory.

Little attention has been given in the literature to comparing or integrating these two theories. The synthesis of the two theories opens the possibility of overcoming limitations experienced by practitioners promoting double‐loop learning in organizations.

It is well known that information behaviour can be biased in countless ways and that users of web search engines have difficulty in assessing the credibility of results. Yet, little is known about how search engine result page (SERP) listings are used to judge credibility and in which if any way such judgements are biased. The paper aims to discuss these issues.

Two studies are presented. The first collects data by means of a controlled, web-based user study (N=105). Studying judgements for three controversial topics, the paper examines the extent to which users agree on credibility, the extent to which judgements relate to those applied by objective assessors and to what extent judgements can be predicted by the users’ position on and prior knowledge of the topic. A second, qualitative study (N=9) utilises the same setup; however, transcribed think-aloud protocols provide an understanding of the cues participants use to estimate credibility.

The first study reveals that users are very uncertain when assessing credibility and their impressions often diverge from objective judges who have fact checked the sources. Little evidence is found indicating that judgements are biased by prior beliefs or knowledge, but differences are observed in the accuracy of judgements across topics. Qualitatively analysing think-aloud transcripts from participants think-aloud reveals ten categories of cues, which participants used to determine the credibility of results. Despite short listings, participants utilised diverse cues for the same listings. Even when the same cues were identified and utilised, different participants often interpreted these differently. Example transcripts show how participants reach varying conclusions, illustrate common mistakes made and highlight problems with existing SERP listings.

This study offers a novel perspective on how the credibility of SERP listings is interpreted when assessing search results. Especially striking is how the same short snippets provide diverse informational cues and how these cues can be interpreted differently depending on the user and his or her background. This finding is significant in terms of how search engine results should be presented and opens up the new challenge of discovering technological solutions, which allow users to better judge the credibility of information sources on the web.