title: Dynamic equilibrium in applied geomorphology: Two case studies

authors: Douglas, Ian

abstract: Engineering works and agricultural activity which change the relationship between rainfall and river flow lead to modifications of river channels with attendant erosion and deposition problems. In the Swiss Jura Lakes area, the natural flooding of the River Aare became such an acute problem by the mid-nineteenth century that extensive engineering works were carried out to alleviate flooding. The land thus reclaimed became a valuable agricultural asset, but the fall of the water table following removal of the annual flood risk, led to a fall in the level of the land as peat was changed into humus. Renewed flooding occurred. The natural readjustment following the first series of flood alleviation works reproduced the original problem and a second series of engineering works has had to be undertaken to remedy the situation. On the Belgian coast, harbour construction and the spread of buildings over the sand dunes have resulted in severe beach erosion in the eastern seaside resorts. Extensive engineering works have had to be undertaken to restore the beach. These examples illustrate how man's challenges to nature are often recurrent phenomena, and how the alteration of one aspect of the physical environment may lead to a succession of readjustments. Each phase of engineering activity may be considered a break in natural equilibrium, and each period of natural erosion or deposition a trend towards a new equilibrium.

text: Dynamic equilibrium in applied geomorphology: Two case studies Engineering works and agricultural activity which change the relationship between rainfall and river flow lead to modifications of river channels with attendant erosion and deposition problems. In the Swiss Jura Lakes area, the natural flooding of the River Aare became such an acute problem by the mid-nineteenth century that extensive engineering works were carried out to alleviate flooding. The land thus reclaimed became a valuable agricultural asset, but the fall of the water table following removal of the annual flood risk, led to a fall in the level of the land as peat was changed into humus. Renewed flooding occurred. The natural readjustment following the first series of flood alleviation works reproduced the original problem and a second series of engineering works has had to be undertaken to remedy the situation. On the Belgian coast, harbour construction and the spread of buildings over the sand dunes have resulted in severe beach erosion in the eastern seaside resorts. Extensive engineering works have had to be undertaken to restore the beach. These examples illustrate how man's challenges to nature are often recurrent phenomena, and how the alteration of one aspect of the physical environment may lead to a succession of readjustments. Each phase of engineering activity may be considered a break in natural equilibrium, and each period of natural erosion or deposition a trend towards a new equilibrium.

year: 1971

title: Production and characterization of titanium based alloys with potential for antifouling and biofouling

authors: Alshammari, Yousef Namlan

subjects: Titanium

abstract: Biofouling is the settlement and accumulation of microorganisms on the surface of a material submerged in sea water, and most of the time is an unwanted phenomenon and constitutes a financial burden. Titanium is a lightweight high strength metal characterised by good corrosion resistance, better than stainless steel, and would be the ideal material to be used in marine applications. However, biofouling would still happen in structures made out of titanium.
The aim of this study is to gain understanding of the biofouling process to be able to design Ti-based materials with the potential to prevent, or conversely enhance, biofouling, as both scenarios could have relevant industrial applications. In particular, it was planned to manufacture the Ti-based materials via powder metallurgy to take advantage of the intrinsic benefits of these techniques which include the freedom of designing new alloys, without the limits imposed by binary phase diagrams.
From literature, it was found that Cu and Mn could have respectively, the ability to reduce or promote biofouling. Therefore, various binary Ti-xCu and Ti-yMn compositions, where x = 0.5%, 2.5%, 5%, and y = 1%, 5%, 10%, were targeted and successfully manufactured via the conventional powder metallurgy route of cold uniaxial pressing plus vacuum sintering, obtaining fully homogeneous materials. 
It is well known that residual porosity is still present in sintered Ti-based materials, and for that the binary Ti-xCu and Ti-yMn alloys were also a thermomechanical process via forging. This hot deformation process should reduce the amount of residual porosity, but it can also be used to tailor the microstructure, and thus the mechanical behaviour, which is paramount for many industrial applications. Along this line, it was decided to investigate the effect of the forging temperature (i.e. of the starting microfeatures) and thus forging from the β and within the α+β region was considered.
From the characterisation performed, the Ti-5Cu and Ti-5Mn alloys were chosen as the most promising alloys for the investigation of the antifouling and biofouling capability of the binary Ti-xCu and Ti-yMn alloys developed

text: Production and characterization of titanium based alloys with potential for antifouling and biofouling Biofouling is the settlement and accumulation of microorganisms on the surface of a material submerged in sea water, and most of the time is an unwanted phenomenon and constitutes a financial burden. Titanium is a lightweight high strength metal characterised by good corrosion resistance, better than stainless steel, and would be the ideal material to be used in marine applications. However, biofouling would still happen in structures made out of titanium.
The aim of this study is to gain understanding of the biofouling process to be able to design Ti-based materials with the potential to prevent, or conversely enhance, biofouling, as both scenarios could have relevant industrial applications. In particular, it was planned to manufacture the Ti-based materials via powder metallurgy to take advantage of the intrinsic benefits of these techniques which include the freedom of designing new alloys, without the limits imposed by binary phase diagrams.
From literature, it was found that Cu and Mn could have respectively, the ability to reduce or promote biofouling. Therefore, various binary Ti-xCu and Ti-yMn compositions, where x = 0.5%, 2.5%, 5%, and y = 1%, 5%, 10%, were targeted and successfully manufactured via the conventional powder metallurgy route of cold uniaxial pressing plus vacuum sintering, obtaining fully homogeneous materials. 
It is well known that residual porosity is still present in sintered Ti-based materials, and for that the binary Ti-xCu and Ti-yMn alloys were also a thermomechanical process via forging. This hot deformation process should reduce the amount of residual porosity, but it can also be used to tailor the microstructure, and thus the mechanical behaviour, which is paramount for many industrial applications. Along this line, it was decided to investigate the effect of the forging temperature (i.e. of the starting microfeatures) and thus forging from the β and within the α+β region was considered.
From the characterisation performed, the Ti-5Cu and Ti-5Mn alloys were chosen as the most promising alloys for the investigation of the antifouling and biofouling capability of the binary Ti-xCu and Ti-yMn alloys developed

year: 2017

title: Building capacity for sustainable Iwi development

authors: Bishop, Russell

subjects: Māori community development

abstract: Since 1998, four iwi groups have participated in a Māori Sustainable Development project with researchers from the University of Waikato. This project has sought to develop a better understanding of iwi aspirations for economic, social and cultural development. Based on this research, the project seeks to identify, in conjunction with iwi, capacity building models and options in order to provide sustainable economic, social and cultural development. One finding of the research, based on the responses from iwi who have participated in this project, identifies iwi values and identity as the basis for a capacity building model for Māori sustainable development. It is this that is the focus of this paper.

text: Building capacity for sustainable Iwi development Since 1998, four iwi groups have participated in a Māori Sustainable Development project with researchers from the University of Waikato. This project has sought to develop a better understanding of iwi aspirations for economic, social and cultural development. Based on this research, the project seeks to identify, in conjunction with iwi, capacity building models and options in order to provide sustainable economic, social and cultural development. One finding of the research, based on the responses from iwi who have participated in this project, identifies iwi values and identity as the basis for a capacity building model for Māori sustainable development. It is this that is the focus of this paper.

year: 2002-09