title: AMS radiocarbon dating of Rattus Exulans bone from the Kokohuia Site (New Zealand)

authors: Higham, Thomas F.G.

abstract: We AMS radiocarbon dated rat bones (Pacific rat (Rattus exulans)) from the archaeological site of Kokohuia, in Northland, New Zealand. An initial series were up to 1200 years too old, but the reason for the offset remained obscure. We considered dietary foodwebs, post-depositional contamination and taphonomy as possible explanations. None provided robust answers. Finally, we identified a laboratory-related error, in which a small amount of old carbon derived from humectants (glycerin) used to moisten ultrafilters prior to the extraction of bone collagen, had become incorporated in the dated collagen. The glycerin humectant was present in amounts averaging 30-40 mg C per ultrafilter, which ordinarily is too small to significantly affect single dates obtained on bone collagen, but was significant in the case of small rat bones. Redating of bones from identical contexts produced a series of results which were within agreement with the age of the site as determined from other materials, including short-lived identified charcoal, and marine and estuarine shell. These results sound a warning for dating very small bone samples, and emphasise the need to consider all possible contaminants derived from laboratory preparation and chemical processing background. In addition, it emphasises the requirement for utilising standard samples of identical type (eg, bone, charcoal, wood etc) which range from young (1-2 half-lives) to background in age, as well as low and high sample mass, as QA laboratory checks on reproducibility (Bronk Ramsey et al., in press).

text: AMS radiocarbon dating of Rattus Exulans bone from the Kokohuia Site (New Zealand) We AMS radiocarbon dated rat bones (Pacific rat (Rattus exulans)) from the archaeological site of Kokohuia, in Northland, New Zealand. An initial series were up to 1200 years too old, but the reason for the offset remained obscure. We considered dietary foodwebs, post-depositional contamination and taphonomy as possible explanations. None provided robust answers. Finally, we identified a laboratory-related error, in which a small amount of old carbon derived from humectants (glycerin) used to moisten ultrafilters prior to the extraction of bone collagen, had become incorporated in the dated collagen. The glycerin humectant was present in amounts averaging 30-40 mg C per ultrafilter, which ordinarily is too small to significantly affect single dates obtained on bone collagen, but was significant in the case of small rat bones. Redating of bones from identical contexts produced a series of results which were within agreement with the age of the site as determined from other materials, including short-lived identified charcoal, and marine and estuarine shell. These results sound a warning for dating very small bone samples, and emphasise the need to consider all possible contaminants derived from laboratory preparation and chemical processing background. In addition, it emphasises the requirement for utilising standard samples of identical type (eg, bone, charcoal, wood etc) which range from young (1-2 half-lives) to background in age, as well as low and high sample mass, as QA laboratory checks on reproducibility (Bronk Ramsey et al., in press).

year: 2004

title: Journeys of Māori women in engineering and engineering trades: Navigating challenges and embracing identity

authors: Moridnejad, Maryam

subjects: engineering

abstract: CONTEXT 
This paper reports a study that explores the lived experiences of five Māori women in New Zealand who are engaged in engineering and engineering trades, aiming to inspire more Māori women to join these fields. Through in-depth interviews, three key phases of their lives are examined: upbringing, educational experiences, and professional encounters. The research identifies barriers and strategies these women employed, revealing themes such as identity development, stereotyping, cultural identity, determination, and support.  

PURPOSE OR GOAL
Diversity remains a persistent concern within traditionally male-dominated fields such as engineering and trades. Literature underscores the invaluable contributions of a diverse workforce, including fresh perspectives, insights, and innovative problem-solving approaches. Efforts to enhance diversity in engineering education must address systemic barriers across all levels of education. The aim of this study is to give voice to Māori women in engineers and engineering trades. The study explores participants' career choices, childhood, schooling, tertiary education, and workplace experiences.

APPROACH OR METHODOLOGY/METHODS
The study is underpinned by a feminist poststructuralist conceptual framework, emphasizing that knowledge is constructed rather than discovered, and power relations are shaped within cultural and societal contexts. Data collection involved an initial short questionnaire and two semi-structured interviews. Qualitative inductive analysis was used. Early thematic coding occurred during the analysis of initial questionnaires to identify key themes for the interviews. Interview data were coded inductively by research assistants and cross-checked by the main researchers to find common themes. In a further analysis phase, interview transcripts were loaded into ChatGPT to identify key commonalities, which were compared with researchers’ codes to finalize the themes. These themes framed the discussion and provided a basis for understanding the lived experiences of Māori women in engineering and engineering trades.

ACTUAL OR ANTICIPATED OUTCOMES
The lives and experiences the five Māori women in this study illuminate the unique experiences and challenges faced by indigenous women pursuing careers in engineering and engineering trades. By amplifying their voices, this research highlights their perspectives, celebrates their agency and resilience, and showcases how they assert themselves, overcome challenges, and advocate for gender equality in their professions. Common themes such as identity development, others’ beliefs and attitudes, cultural identity, determination, and support and encouragement frame the discussion, assisting in demystifying societal realities and gaining insight into their social realities. This research aims to empower and make these women visible. The findings highlight the need for timely career guidance in schools, dismantling gender stereotypes early, and integrating Māori culture into workplaces to foster equity and inclusion.

CONCLUSIONS/RECOMMENDATIONS/SUMMARY
Collaborative efforts from educators, researchers, and policymakers are needed to address systemic barriers and create inclusive pathways for indigenous women and other underrepresented groups into engineering. Flexible support services tailored to the diverse needs are essential for facilitating success in these fields. The researchers suggest further research should focus on longitudinal studies tracking the career trajectories of minority groups, exploring how cultural and gender identities influence educational experiences, evaluating the effectiveness of existing support programmes, and examining the role of mentorship and support networks in empowering minority students to succeed in engineering and trades careers.

text: Journeys of Māori women in engineering and engineering trades: Navigating challenges and embracing identity CONTEXT 
This paper reports a study that explores the lived experiences of five Māori women in New Zealand who are engaged in engineering and engineering trades, aiming to inspire more Māori women to join these fields. Through in-depth interviews, three key phases of their lives are examined: upbringing, educational experiences, and professional encounters. The research identifies barriers and strategies these women employed, revealing themes such as identity development, stereotyping, cultural identity, determination, and support.  

PURPOSE OR GOAL
Diversity remains a persistent concern within traditionally male-dominated fields such as engineering and trades. Literature underscores the invaluable contributions of a diverse workforce, including fresh perspectives, insights, and innovative problem-solving approaches. Efforts to enhance diversity in engineering education must address systemic barriers across all levels of education. The aim of this study is to give voice to Māori women in engineers and engineering trades. The study explores participants' career choices, childhood, schooling, tertiary education, and workplace experiences.

APPROACH OR METHODOLOGY/METHODS
The study is underpinned by a feminist poststructuralist conceptual framework, emphasizing that knowledge is constructed rather than discovered, and power relations are shaped within cultural and societal contexts. Data collection involved an initial short questionnaire and two semi-structured interviews. Qualitative inductive analysis was used. Early thematic coding occurred during the analysis of initial questionnaires to identify key themes for the interviews. Interview data were coded inductively by research assistants and cross-checked by the main researchers to find common themes. In a further analysis phase, interview transcripts were loaded into ChatGPT to identify key commonalities, which were compared with researchers’ codes to finalize the themes. These themes framed the discussion and provided a basis for understanding the lived experiences of Māori women in engineering and engineering trades.

ACTUAL OR ANTICIPATED OUTCOMES
The lives and experiences the five Māori women in this study illuminate the unique experiences and challenges faced by indigenous women pursuing careers in engineering and engineering trades. By amplifying their voices, this research highlights their perspectives, celebrates their agency and resilience, and showcases how they assert themselves, overcome challenges, and advocate for gender equality in their professions. Common themes such as identity development, others’ beliefs and attitudes, cultural identity, determination, and support and encouragement frame the discussion, assisting in demystifying societal realities and gaining insight into their social realities. This research aims to empower and make these women visible. The findings highlight the need for timely career guidance in schools, dismantling gender stereotypes early, and integrating Māori culture into workplaces to foster equity and inclusion.

CONCLUSIONS/RECOMMENDATIONS/SUMMARY
Collaborative efforts from educators, researchers, and policymakers are needed to address systemic barriers and create inclusive pathways for indigenous women and other underrepresented groups into engineering. Flexible support services tailored to the diverse needs are essential for facilitating success in these fields. The researchers suggest further research should focus on longitudinal studies tracking the career trajectories of minority groups, exploring how cultural and gender identities influence educational experiences, evaluating the effectiveness of existing support programmes, and examining the role of mentorship and support networks in empowering minority students to succeed in engineering and trades careers.

year: 2024

title: Thermoplastic Protein Nano-Composites Using Bloodmeal and Bentonite

authors: Verbeek, Casparus Johan R.

subjects: nano-composite

abstract: Bloodmeal is a low value meat industry product and can be converted into a thermoplastic material. These novel thermoplastics often have inferior mechanical properties and require some degree of reinforcement. Reinforcement using octadecylamine (OAmine) modified bentonite have shown an increase in tensile strength from 7.69 to 9.26 MPa by using 2 parts clay per hundred parts bloodmeal. Unmodified clay did not lead to the same increase in strength. High shear during extrusion was not sufficient to prevent agglomeration at higher clay content leading to modified clay composites showing reduced tensile strength. Particle size of unmodified clay composites was small enough to lead to dispersion reinforcement, whereas modified clay composites showed even greater agglomeration, leading to a decrease in strength. It was concluded that the physical nature of the thermoplastic protein requires careful consideration as to the level of clay modification required.

text: Thermoplastic Protein Nano-Composites Using Bloodmeal and Bentonite Bloodmeal is a low value meat industry product and can be converted into a thermoplastic material. These novel thermoplastics often have inferior mechanical properties and require some degree of reinforcement. Reinforcement using octadecylamine (OAmine) modified bentonite have shown an increase in tensile strength from 7.69 to 9.26 MPa by using 2 parts clay per hundred parts bloodmeal. Unmodified clay did not lead to the same increase in strength. High shear during extrusion was not sufficient to prevent agglomeration at higher clay content leading to modified clay composites showing reduced tensile strength. Particle size of unmodified clay composites was small enough to lead to dispersion reinforcement, whereas modified clay composites showed even greater agglomeration, leading to a decrease in strength. It was concluded that the physical nature of the thermoplastic protein requires careful consideration as to the level of clay modification required.

year: 2013