title: Preparation and tensile properties of guar gum hydrogel films

authors: Jussen, Daniel

abstract: Guar gum hydrogels may be dried to form polymer films which have the potential for use as biodegradable alternatives to polymers such as low-density polyethylene. In this study, the tensile strength and tensile modulus of guar gel films having moisture contents ranging between 15% and 18% (wet basis) were measured at a strain rate of 1 mm min⁻¹. Mean tensile strengths of the films ranged between 25 MPa and 40 MPa (dependent on composition) which is of similar magnitude to the tensile strength data for polyethylene and cellophane that are reported in the literature. The mean tensile modulus of the films (1.5–2.5 GPa) was higher than the tensile modulus values reported for low-density polyethylene but comparable to those for cellophane (3 GPa).

text: Preparation and tensile properties of guar gum hydrogel films Guar gum hydrogels may be dried to form polymer films which have the potential for use as biodegradable alternatives to polymers such as low-density polyethylene. In this study, the tensile strength and tensile modulus of guar gel films having moisture contents ranging between 15% and 18% (wet basis) were measured at a strain rate of 1 mm min⁻¹. Mean tensile strengths of the films ranged between 25 MPa and 40 MPa (dependent on composition) which is of similar magnitude to the tensile strength data for polyethylene and cellophane that are reported in the literature. The mean tensile modulus of the films (1.5–2.5 GPa) was higher than the tensile modulus values reported for low-density polyethylene but comparable to those for cellophane (3 GPa).

year: 2019

title: How an exchange of perspectives led to tentative ethical guidelines for visual ethnography

authors: Pope, Clive C.

subjects: visual ethics

abstract: Qualitative research, especially visual ethnography, is an iterative not a linear process, replete with good intentions, false starts, mistaken assumptions, miscommunication and a continually revised statement of the problem. That the camera freezes everything and everyone in the frame only complicates ethical considerations. This work, jointly authored by the researcher, the Research Ethics Committee (REC) chair and an informed outsider, walks the reader through the ethical challenges the researcher experienced seeking REC approval to conduct a visual ethnography of a secondary school's rowing event. Eventually, the researcher found the challenges and ambiguities of informed consent indicative of the current issues facing many researchers working with the visual medium. The account fleshes out a procedural ethics and ethics in practice dichotomy and ends with the researcher and REC chair retrospectively contemplating the iterative ethics of visual ethnography. We conclude our conversation by proposing five tentative guidelines for visual ethnography researchers and their research ethics committees.

text: How an exchange of perspectives led to tentative ethical guidelines for visual ethnography Qualitative research, especially visual ethnography, is an iterative not a linear process, replete with good intentions, false starts, mistaken assumptions, miscommunication and a continually revised statement of the problem. That the camera freezes everything and everyone in the frame only complicates ethical considerations. This work, jointly authored by the researcher, the Research Ethics Committee (REC) chair and an informed outsider, walks the reader through the ethical challenges the researcher experienced seeking REC approval to conduct a visual ethnography of a secondary school's rowing event. Eventually, the researcher found the challenges and ambiguities of informed consent indicative of the current issues facing many researchers working with the visual medium. The account fleshes out a procedural ethics and ethics in practice dichotomy and ends with the researcher and REC chair retrospectively contemplating the iterative ethics of visual ethnography. We conclude our conversation by proposing five tentative guidelines for visual ethnography researchers and their research ethics committees.

year: 2010

title: Looking at relationships between propositions in Maori language

authors: Houia, Waldo

subjects: Te reo Māori

abstract: This paper reports on an investigation into the various ways in which relationships of meaning, such as reason-result and temporal overlap, are encoded as clauses, sentences and groups of sentences in Māori. It also provides an indication of the relevance of this type of research to teachers and learners of Māori.

text: Looking at relationships between propositions in Maori language This paper reports on an investigation into the various ways in which relationships of meaning, such as reason-result and temporal overlap, are encoded as clauses, sentences and groups of sentences in Māori. It also provides an indication of the relevance of this type of research to teachers and learners of Māori.

year: 2001