title: Hemp fibre reinforced poly(lactic acid) composites

authors: Sawpan, Moyeenuddin Ahmad

subjects: hemp fibre

abstract: The potential of hemp fibre as a reinforcing material for Poly(lactic acid) (PLA) was investigated. Good interaction between hemp fibre and PLA resulted in increases of 100% for Young’s modulus and 30% for tensile strength of composites containing 30 wt% fibre. Different predictive ‘rule of mixtures’ models (e.g. Parallel, Series and Hirsch) were assessed regarding the dependence of tensile properties on fibre loading. Limited agreement with models was observed. Differential scanning calorimetry (DSC) and x-ray diffraction (XRD) studies showed that hemp fibre increased the degree of crystallinity in PLA composites.

text: Hemp fibre reinforced poly(lactic acid) composites The potential of hemp fibre as a reinforcing material for Poly(lactic acid) (PLA) was investigated. Good interaction between hemp fibre and PLA resulted in increases of 100% for Young’s modulus and 30% for tensile strength of composites containing 30 wt% fibre. Different predictive ‘rule of mixtures’ models (e.g. Parallel, Series and Hirsch) were assessed regarding the dependence of tensile properties on fibre loading. Limited agreement with models was observed. Differential scanning calorimetry (DSC) and x-ray diffraction (XRD) studies showed that hemp fibre increased the degree of crystallinity in PLA composites.

year: 2007

title: Using physical clocks for replication in MANETs

authors: Scholz, Manuel

subjects: computer science

abstract: When update-anywhere data replication is performed in a MANET, operations on replicated data are often executed concurrently. To achieve a global total ordering of all operations, we propose a hybrid timestamp mechanism that combines physical clocks and logical timestamps. Our approach overcomes the ordering problem that arises from imprecisely synchronized physical clocks. We overlay the timestamps of operations with a grid of time-slots. To order the operations, we use physical clocks for operations in different time-slots and logical clocks for operations within the same time-slot. We prove that our method guarantees a total ordering when using an appropriate grid width.

text: Using physical clocks for replication in MANETs When update-anywhere data replication is performed in a MANET, operations on replicated data are often executed concurrently. To achieve a global total ordering of all operations, we propose a hybrid timestamp mechanism that combines physical clocks and logical timestamps. Our approach overcomes the ordering problem that arises from imprecisely synchronized physical clocks. We overlay the timestamps of operations with a grid of time-slots. To order the operations, we use physical clocks for operations in different time-slots and logical clocks for operations within the same time-slot. We prove that our method guarantees a total ordering when using an appropriate grid width.

year: 2007

title: Race, culture and ethnicity: Organisation of Maori social groups: A working paper

authors: Nikora, Linda Waimarie

subjects: Maori

abstract: Three concepts have guided the conceptual orientation to studies of human groups within the social sciences. They are those concepts of race, culture, and ethnicity. These are discussed with specific reference to Maori peoples and their development in Te Aohurihuri.

text: Race, culture and ethnicity: Organisation of Maori social groups: A working paper Three concepts have guided the conceptual orientation to studies of human groups within the social sciences. They are those concepts of race, culture, and ethnicity. These are discussed with specific reference to Maori peoples and their development in Te Aohurihuri.

year: 1995-06-01