title: Grain growth and kinetics for nanocrystalline magnesium alloy produced by mechanical alloying

authors: Cao, Peng

subjects: alloys

abstract: A study on the kinetics of grain growth of an Mg-12.1 wt%Cu alloy produced by mechanical alloying was carried out. The grain sizes of as-mechanically alloyed powder and of cold-compacted annealed powder were determined from the broadening of X-ray lines. The grain size deceases initially due to recrystallization and then increases gradually, and finally ceases to reach an ultimate value regardless of annealing time. From isothermal anneals, the grain growth kinetics can be described by Dn − D0n = ct, where n (n = 5 to 8) is a constant essentially dependent on the annealing temperature. The activation energy for grain growth Q has been determined to be 118 kJ/mol, which is longer by 26 kJ/mol than that for pure magnesium. Second-phase intermetallic particle Mg2Cu produced during ball-milling influences not only on activation energy but also on exponent of the kinetic equation.

text: Grain growth and kinetics for nanocrystalline magnesium alloy produced by mechanical alloying A study on the kinetics of grain growth of an Mg-12.1 wt%Cu alloy produced by mechanical alloying was carried out. The grain sizes of as-mechanically alloyed powder and of cold-compacted annealed powder were determined from the broadening of X-ray lines. The grain size deceases initially due to recrystallization and then increases gradually, and finally ceases to reach an ultimate value regardless of annealing time. From isothermal anneals, the grain growth kinetics can be described by Dn − D0n = ct, where n (n = 5 to 8) is a constant essentially dependent on the annealing temperature. The activation energy for grain growth Q has been determined to be 118 kJ/mol, which is longer by 26 kJ/mol than that for pure magnesium. Second-phase intermetallic particle Mg2Cu produced during ball-milling influences not only on activation energy but also on exponent of the kinetic equation.

year: 2001

title: Handing on Christ: Rediscovering the Gift of Christian Doctrine – By Richard Clutterbuck [Book review]

authors: Pratt, Douglas

subjects: book review

abstract: This article reviews the book: “Handing on Christ: Rediscovering the Gift of Christian Doctrine”, by Richard Clutterbuck.

text: Handing on Christ: Rediscovering the Gift of Christian Doctrine – By Richard Clutterbuck [Book review] This article reviews the book: “Handing on Christ: Rediscovering the Gift of Christian Doctrine”, by Richard Clutterbuck.

year: 2011

title: Wearable technology for hazardous remote environments: Smart shirt and Rugged IoT network for forestry worker health

authors: Hinze, Annika

subjects: software engineering

abstract: This paper introduces the architecture and details of our wearable IoT solution for workplace health and safety in rugged outdoor environments. We focus on the specific requirements defined by the New Zealand forestry environment as it is the industry with the most fatalities and highest accident rate in New Zealand. Neither consumer-level products nor professional wearables have been found to be suitable for forestry conditions. Furthermore, forestry workplaces cannot rely on existing networking infrastructure, and due to their remote and rugged nature, no permanent setup is possible.

We describe the Hakituri project in which we integrate wearable devices, networking, data analytics, and a buddy system into a novel monitoring solution for worker health and safety. Our wearable IoT solution includes a dynamic network set-up, wearables suitable for forestry conditions, contextual rule-based data analytics, and real-time alerts. A wearable smart shirt carries sensors for collecting personal data from forestry workers, while further environmental sensors capture contextual data. The IoT network is set up for communication in unreliable and rugged outdoor environments. We explore a variety of setups to achieve the best quality outcomes for health and safety in the forestry domain.

text: Wearable technology for hazardous remote environments: Smart shirt and Rugged IoT network for forestry worker health This paper introduces the architecture and details of our wearable IoT solution for workplace health and safety in rugged outdoor environments. We focus on the specific requirements defined by the New Zealand forestry environment as it is the industry with the most fatalities and highest accident rate in New Zealand. Neither consumer-level products nor professional wearables have been found to be suitable for forestry conditions. Furthermore, forestry workplaces cannot rely on existing networking infrastructure, and due to their remote and rugged nature, no permanent setup is possible.

We describe the Hakituri project in which we integrate wearable devices, networking, data analytics, and a buddy system into a novel monitoring solution for worker health and safety. Our wearable IoT solution includes a dynamic network set-up, wearables suitable for forestry conditions, contextual rule-based data analytics, and real-time alerts. A wearable smart shirt carries sensors for collecting personal data from forestry workers, while further environmental sensors capture contextual data. The IoT network is set up for communication in unreliable and rugged outdoor environments. We explore a variety of setups to achieve the best quality outcomes for health and safety in the forestry domain.

year: 2022