Impact of lightweight and conventional jackhammers on the operator

Jackhammer manufacturers have recently developed lightweight (45-60 lbs) jackhammers intended to reduce the required lifting and pushing forces during operation. However, the vibration characteristics of the lightweight jackhammers and their effect on muscle activity are currently unknown. The objective of this study was to compare the measured vibration and muscle activity between: (i) conventional (90 lb) and light weight (60 lb) jackhammers, (ii) different pavement type/thickness combinations, and (iii) pneumatic and hydraulic jackhammers. Five jackhammers were tested on 4 and 6 inch thick asphalt and concrete pavements by four experienced operators. Analysis of the results revealed that both weight classes averaged 9.7 m/s(2) at the 20 Hz weighted 1/3 octave band frequency, and the TLV of daily exposure for either weight class of jackhammer was less than 1.5 hours/per day. There was an approximately 33% difference in vibration measured on the hand of the operators due to pavement thickness, 30% due pavement type, and no difference due to power source. Conventional jackhammers overall produced higher muscle activity than lightweight jackhammers. Although selection of the correct jackhammer for the job involves many factors including pavement type and thickness, the results of this research can be used to assist in selecting the appropriate jackhammer.     

“Let’s Talk About Children” resource: A parallel mixed method evaluation

Psycho-education interventions for families affected by parental mental illness have been found to be effective. This study aimed to assess the feasibility of a psycho-educational resource for parents, designed to initiate family discussions about parental mental illness and educate parents about the impact of their illness on children. In a mixed methods design, 19 parents read the “Let’s Talk About Children” psycho-educational resource and completed pre-and-post questionnaires measuring their perspectives of mental illness and awareness of the impact of mental illness on their children and family. 18 of these participated in a follow-up, one hour, individual interview to obtain further feedback on the resource. After viewing the resource, changes in parents’ attitudes and/or behavior in relation to mental illness and parenting were recorded. Interview findings indicate that the resource gave parents an awareness of the skills and knowledge needed for initiating family discussions about parental mental illness. The results of this study can be used to inform future interventions targeting parents who experience mental illness.     

Workplace aggression against health care workers,law enforcement officials,and bus drivers: Differences in prevalence,perceptions, and psychological consequences

Investigations into workplace aggression (WPA) remain largely occupation specific, with few studies using a comparative approach. The aim of the present study was to compare the health care, law enforcement, and public transportation sectors with regards to the prevalence of different types of WPA, the perceptions of workers toward WPA, and the psychological consequences of such acts. A cross-sectional survey was completed by 1,774 workers in Canada. Multinomial regressions were utilized to address the objectives. Findings revealed that verbal abuse victimization was particularly common in bus drivers, witnessing death threats was most frequent among law enforcement officials, and witnessing all types of WPA was most common among health care workers. Although bus drivers did not normalize WPA, they feared complaining about violence to their employer and thought it useless to talk it about unless wounds were visible. Fear of complaining about violence to colleagues was prevalent in health care and law enforcement, both sectors in which WPA was normalized. Finally, flashbacks and irritability following WPA were most likely to affect bus drivers whereas health care workers experienced hypervigilance to a greater extent. Strategies to tailor primary, secondary, and tertiary prevention according to these distinctions are suggested to offer a better-informed response to WPA.     

Computing A-optimal and E-optimal designs for regression models via semidefinite programming

In semidefinite programming (SDP), we minimize a linear objective function subject to a linear matrix being positive semidefinite. A powerful program, SeDuMi, has been developed in MATLAB to solve SDP problems. In this article, we show in detail how to formulate A-optimal and E-optimal design problems as SDP problems and solve them by SeDuMi. This technique can be used to construct approximate A-optimal and E-optimal designs for all linear and nonlinear regression models with discrete design spaces. In addition, the results on discrete design spaces provide useful guidance for finding optimal designs on any continuous design space, and a convergence result is derived. Moreover, restrictions in the designs can be easily incorporated in the SDP problems and solved by SeDuMi. Several representative examples and one MATLAB program are given.     

Fetal movements: What are we telling women?

Problem

Information that women receive about the importance of monitoring fetal movements and what to do if there are changes is inconsistent and may not be evidence based.

Creativity in social work education and practice: reflections on a Survivor Arts Project

This article, written by survivor artists, practitioners and academics (each moving between these different identities and associated voices), will explore a creative arts approach to social work (SW) education within the context of service user and carer involvement. In addition to building upon a developing literature base, the writers will draw upon their own experience and the experience of other service user and carer contributors as well as student and practitioner feedback. In doing so, this article will seek to analyse some of the ways the creative arts can be harnessed as a tool for a more radical, creative and critical approach to professional education and how this in turn can help develop more empathic, critically self-reflective and creative (in the broadest sense of the word) practitioners. In critiquing the more traditional service user and carer involvement approach, this article will attempt to show how the more innovative approach of the Survivor Arts Project can move us beyond an arguably more limiting ‘expertise through experience’ model. In outlining an emancipatory model which recognises the relevance of lived experience and places this within the context of survivor movements, focusing also on the skills and insights survivors bring to SW education, this article will detail the ways we can work towards developing a more vibrant and dynamic learning environment which values our life stories and recognises our strengths as well as the many different and overlapping identities which place us along a continuum that connects our lives and informs our practice.     

Report on the implementation and evaluation of an interprofessional learning programme for inter‐agency child protection teams

Effective collaborative working between the different professions and agencies working to safeguard children is essential. Lack of knowledge of others' roles, perceived differences in status and expertise, and negative stereotypes are examples of why this can be difficult to achieve. A facilitated interprofessional learning (IPL) programme was implemented to assess if such an intervention could overcome some of the barriers to effective interprofessional and inter‐agency team working. Six teams based in primary and secondary care trusts took part with participants from health, education, police and social services. Quantitative and qualitative data were collected from individual participants using a pre‐validated team climate inventory and reflective statements. Findings from this study demonstrate statistically significant changes in five out of six categories in the inventory. Reflective statements suggested that overall the programme offered a positive learning experience at both an individual and team level. The importance of outside facilitation to maintain the team's momentum was acknowledged, as was the difficulty of maintaining a good level of activity once the programme had ended. Nevertheless, the IPL programme provided a timely opportunity to reflect upon the interprofessional and inter‐agency team working needed within Children's Trusts and the implications for staff involved with regard to skills development. Copyright © 2009 John Wiley & Sons, Ltd.