Mitchell, CA, Weise, R & Young, R 1998, 'Design of wastewater wetlands' in Constructed Wetlands Manual, Department of Land and Water Conservation, Sydney, NSW, pp. 256-289.
Plant, RAJ 1998, 'GIS-Based Extrapolation of Land Use-Related Nitrous Oxide Flux in the Atlantic Zone of Costa Rica' in Wieder, RK, Novak, M & Cerny (eds), Biogeochemical Investigations at Watershed, Landscape, and Regional Scales, Springer Netherlands, Netherlands, pp. 131-141.
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Abeysinghe, T & Lee, C 1998, 'Best linear unbiased disaggregation of annual GDP to quarterly figures: the case of Malaysia', Journal of Forecasting, vol. 17, no. 7, pp. 527-537.
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Arango, N, Jacobs, BC & Blumenthal, MJ 1998, 'Seed production of Lotus uliginosus cv. Sharnae in response to plant population density', Australian Journal of Experimental Agriculture, vol. 38, no. 8, pp. 837-837.
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Summary. An experiment was carried out under irrigationin the field to determine the influence of plant population density (7.5, 15,30 and 60 plants/m2) on growth, development andyield of the pasture legume Lotus uliginosuscv. Sharnae.Reproductive development (flowering, pod set and stages of pod development)was recorded from 79 days after establishment and harvests were taken on 3occasions during pod development: 118, 138 and 158 days after establishment.At each harvest, plants were divided into leaf, stem and pods. The pods werefurther separated into maturity classes on the basis of colour, and seednumber and weight measured for each class.Harvesting late (i.e. 158 days after establishment) maximised seed yield (113g/m2) and seed quality (27% immature, greenpods). Seed yield per unit area up to 158 days after establishment wasrelatively insensitive to plant population up to 60plants/m2 because the response of individual plantsof lotus was highly plastic. At 158 days after establishment, dry matter perplant declined from 985 g at 7.5 plants/m2 to 713 gat 60 plants/m2. At the same time, seed number perplant and seed weight per plant were reduced from 27 400 to 3230 seeds andfrom 15.5 to 1.65 g, respectively, across the range of population densities.Despite the lack of a clear optimum plant population for maximum seed yield,some aspects of seed quality declined at high population density. For example,single seed weight fell by about 10% from 0.563 mg and the proportionof the harvest contributed by seeds from immature pods rose from 18 to33%, as population density increased from 7.5 and 60plants/m2.Seed quality and ease of management, rather than yield, may be the mostimportant considerations when seed growers choose a sowing rate for aL. pedunculatus cv. Sharnae seed crop.
Carson, L & White, S 1998, 'Sydney water contamination crisis: manufacturing dissent', Science and Public Policy, vol. 25, no. 4, pp. 265-271.
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The widely publicised contamination of Sydney's water supply in July 1998 felt like a crisis to affected Sydney residents but the rhetoric did not match the reality. We are interested in the way our reality is constructed, the way we manufacture consent or dissent, the way in which some knowledge is privileged and the way that power is attached to this knowledge. The Sydney Water Contamination Crisis sparked our interest because it proved to be an excellent event to watch: we could daily track the construction of 'truth'. It was also a fascinating study in paternalism and an example of public exclusion from the decision-making process. We speculate on some alternative decision-making approaches which might help us avoid a recurrence of the Sydney case study.
Chaharsoghi, AT & Jacobs, B 1998, 'Manipulating dormancy of capeweed (Arctotheca calendulaL.) seed', Seed Science Research, vol. 8, no. 2, pp. 139-146.
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AbstractCapeweed (Arctotheca calendula) seeds were found to be dormant at harvest. Effects of duration and temperature of storage under ‘laboratory’ and ‘natural’ conditions, growth regulators, stratification and age of seeds, were studied on the germination of dormant seeds. Three factors imposed on seeds were found to promote germination of capeweed: (i) allowing seed to age, either in storage, buried in soil or during stratification (germination of 18-month-old seeds was up to 60% higher than that of fresh seeds); (ii) the presence of light (the average germination percentage of seeds exposed to light during storage was 3.2-fold greater than that of seed stored in the dark); and (iii) the application of growth regulators, particularly gibberellic acid, enhanced by scarification (GA3and ethephon promoted germination by up to 58% when applied to scarified seeds). Other factors, e.g. temperature and depth of storage, influenced germination but were less critical to its success. These results provide a preliminary assessment of the importance of these factors in controlling dormancy in seeds of capeweed.
Chaharsoghi, AT & Jacobs, B 1998, 'Manipulating dormancy of capeweed (Arctotheca calendula L.) seed', Seed Science Research, vol. 8, no. 2, pp. 139-146.
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Capeweed (Arctotheca calendula) seeds were found to be dormant at harvest. Effects of duration and temperature of storage under 'laboratory' and 'natural' conditions, growth regulators, stratification and age of seeds, were studied on the germination of dormant seeds. Three factors imposed on seeds were found to promote germination of capeweed: (i) allowing seed to age, either in storage, buried in soil or during stratification (germination of 18-month-old seeds was up to 60% higher than that of fresh seeds); (ii) the presence of light (the average germination percentage of seeds exposed to light during storage was 3.2-fold greater than that of seed stored in the dark); and (iii) the application of growth regulators, particularly gibberellic acid, enhanced by scarification (GA3 and ethephon promoted germination by up to 58% when applied to scarified seeds). Other factors, e.g. temperature and depth of storage, influenced germination but were less critical to its success. These results provide a preliminary assessment of the importance of these factors in controlling dormancy in seeds of capeweed.
Mitchell, CA 1998, 'Creativity Is About Being Free ...', European Journal of Engineering Education, vol. 23, no. 1, pp. 23-34.
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I began this journey with the notion that creativity is somehow linked to having the freedom to explore and discover and dissemble and reassemble in whatever form we choose. This notion is compared with the ideas of researchers in the field of creativity. As an engineer who believes in a holistic approach, I am most comfortable with the idea of creativity as a multifarious beast, influenced by both personality and the cultural, social and professional environment in which engineers, in this case, find themselves. This being the case, engineering educators therefore have some opportunity to influence these factors, and hence the development of creative thinking in our students. I then examine a case study of a design project in second-year chemical and environmental engineering in an attempt to ground these ideas about creativity in engineering education practice, and present the lessons learned from this experience.
Plant, RAJ 1998, 'GIS-based extrapolation of land use-related nitrous oxide flux in the Atlantic Zone of Costa Rica', Water, Air, and Soil Pollution, vol. 105, no. 1/2, pp. 131-141.
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I estimated the regional nitrous oxide (N2O) flux from 281,347 ha of Costa Rican lowland, covered with primary and secondary forest, pastures, and banana plantations, by linking the DeNitrification-DeComposition (DNDC) model with a Geographic Information System (GIS). Generalized soil, texture, and land use maps were overlaid to yield unique combinations of N2O flux control factors. Overlay patches were associated with the nearest of seven available meteorological stations. Monte Carlo-based sensitivity analysis was used to identify DNDCâs key driving variables and required map attributes. Clay content, initial soil organic carbon (SOC), bulk density, and pH were selected as key driving variables. For 217 patch classes, DNDC simulations were carried out with climate data for seven different years. The estimated average regional flux was 6.8 kg N2O-N ha-1 yr-1. Possible applications of the GIS-DNDC interface presented include estimation of long-term regional flux dynamics from a changing land use mosaic, and prediction of regional fluxes resulting from alternative land use scenarios.
Crofton, FS & Mitchell, CA 1970, 'Role models and environmental education: the good, the bad, and the MIA', ASEE Annual Conference Proceedings, p. 10.
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This report considers the various ways by which faculty members do and could impact students. The context is environmental education in a broad sense. Examples of some good and not-so-good role model behaviors are given, and areas where better or more role models are needed are identified. Suggestions are also given for identifying, supporting, encouraging and/or developing role models of the environmental engineer and engineering educator of the future.
Mitchell, CA, Edgerton, BD & Barford, JP 1970, 'Strategies for dealing with piggery effluent in Australia', Environmental Engineering Research Event, Environmental Engineering Research Event, Avoca Beach, pp. 189-194.
Mitchell, CA, King, A, Cossins, R & Howes, T 1970, 'Quantifying transverse dispersion of waste water flows in a subsurface flow wetland to predict surface reaeration rates', Chemeca 98: Australasian Chemical Engineering Conference, Port Douglas, Australia.
Mitchell, CA, Simi, AL, Marshall, PR & De Bruyn, BP 1970, 'Environmental performance benefits arising from the installation of a constructed wetlands to polish oil refinery waste water', Chemeca 98: Australasian Chemical Engineering Conference, Port Dougals, Australia.
Willetts, J, Ashbolt, N & Moosbrugger, R 1970, 'Thermophilic anaerobic systems for treatment of industrial wastewaters', Proceedings of Environmental Engineering Research Event, Avoca, NSW.
