title: Injection-Molding Performance and Mechanical Properties of Blood Meal-Based Thermoplastics

authors: Adamy, Maximilian

subjects: biodegradable

abstract: Protein-based thermoplastics offer an attractive alternative to petroleum-based plastics if their properties allow for large volume production using processes such as injection molding. A fractional factorial design was used to analyze the influence of injection-molding parameters (melt temperature, tool temperature, injection rate, holding pressure, and cooling time) on the injection-molding process (maximum injection pressure, injection pressure curve) and mechanical properties (tensile strength, elongation at break, secant modulus) of blood meal–based thermoplastics. Optimal mechanical properties were obtained at higher tool and melt temperatures while the injection rate was unimportant. The most important injection parameter was the holding pressure, which has to be lowered when using a higher melt temperature, which was preferred for better elongation at break. A lower holding pressure also produced moldings with a higher modulus, which could be good for demolding. Blood meal–based thermoplastics behaved mostly like standard thermoplastics, without any significant deviations. Within a workable processing window, its mechanical properties were largely unaffected by processing conditions, but as with any thermoplastic, care must be taken to select the best injection-molding parameter settings to achieve optimal part quality and high processability.

text: Injection-Molding Performance and Mechanical Properties of Blood Meal-Based Thermoplastics Protein-based thermoplastics offer an attractive alternative to petroleum-based plastics if their properties allow for large volume production using processes such as injection molding. A fractional factorial design was used to analyze the influence of injection-molding parameters (melt temperature, tool temperature, injection rate, holding pressure, and cooling time) on the injection-molding process (maximum injection pressure, injection pressure curve) and mechanical properties (tensile strength, elongation at break, secant modulus) of blood meal–based thermoplastics. Optimal mechanical properties were obtained at higher tool and melt temperatures while the injection rate was unimportant. The most important injection parameter was the holding pressure, which has to be lowered when using a higher melt temperature, which was preferred for better elongation at break. A lower holding pressure also produced moldings with a higher modulus, which could be good for demolding. Blood meal–based thermoplastics behaved mostly like standard thermoplastics, without any significant deviations. Within a workable processing window, its mechanical properties were largely unaffected by processing conditions, but as with any thermoplastic, care must be taken to select the best injection-molding parameter settings to achieve optimal part quality and high processability.

year: 2013

title: Contemporary pressures on school-based research: A cautionary tale for school leaders

authors: Smith, Megan

subjects: School-based research

abstract: School-based research has historically played an important role within the education system contributing to our understanding of the organisation and practice of formal education. Supported by relevant literature, this article reports on current challenges in conducting school-based research in Aotearoa New Zealand as experienced by one researcher. It suggests that conducting school-based research is becoming increasingly difficult, with possible explanations for this being the divergent workflows of researcher and school-based participant(s), the volume of demands on teachers and schools, and restricted roles for teachers and parents, which increase the risk of research fatigue. The article argues that although school-based research is rarely an immediate priority for school leaders, it is imperative that they support it if they want to be informed by its insights for policy and practice.

text: Contemporary pressures on school-based research: A cautionary tale for school leaders School-based research has historically played an important role within the education system contributing to our understanding of the organisation and practice of formal education. Supported by relevant literature, this article reports on current challenges in conducting school-based research in Aotearoa New Zealand as experienced by one researcher. It suggests that conducting school-based research is becoming increasingly difficult, with possible explanations for this being the divergent workflows of researcher and school-based participant(s), the volume of demands on teachers and schools, and restricted roles for teachers and parents, which increase the risk of research fatigue. The article argues that although school-based research is rarely an immediate priority for school leaders, it is imperative that they support it if they want to be informed by its insights for policy and practice.

year: 2020

title: Technology, culture and location in a recent New Zealand sonic art project

authors: Whalley, Ian

subjects: music

abstract: The HIEMPA (Hybrid Instruments from Electroacoustic Manipulation And Models of Pütorino and Aquascape) project combined a team of people with technical, artistic, environmental and cultural expertise toward the artistic outcome of extending the New Zealand sonic art tradition. The project involved collecting audio samples from the aquascape of the Ruakuri Caves and Nature Reserve in Waitomo, South Waikato, New Zealand; and samples of a variety of Pütorino – a New Zealand Mäori wind instrument. Following a machine learning analysis of this audio material and an analysis of the performance material, hybrid digital instruments were built and mapped to suitable hardware triggers. The new instruments are playable in real-time, along with the electroacoustic manipulation of Pütorino performances. The project takes into account the environmental and cultural significance of the source material, with the results to be released as a set of compositions. This paper discusses the research process.

text: Technology, culture and location in a recent New Zealand sonic art project The HIEMPA (Hybrid Instruments from Electroacoustic Manipulation And Models of Pütorino and Aquascape) project combined a team of people with technical, artistic, environmental and cultural expertise toward the artistic outcome of extending the New Zealand sonic art tradition. The project involved collecting audio samples from the aquascape of the Ruakuri Caves and Nature Reserve in Waitomo, South Waikato, New Zealand; and samples of a variety of Pütorino – a New Zealand Mäori wind instrument. Following a machine learning analysis of this audio material and an analysis of the performance material, hybrid digital instruments were built and mapped to suitable hardware triggers. The new instruments are playable in real-time, along with the electroacoustic manipulation of Pütorino performances. The project takes into account the environmental and cultural significance of the source material, with the results to be released as a set of compositions. This paper discusses the research process.

year: 2008