196,978 research outputs found
On a Unique Nondegenerate Distribution of Agents in the Huggett Model
No full textA theoretical curiosity remains in the Huggett [1993] model as to the possible existence of a unique and degenerate stationary distribution of agent types. This coincides with the possibility that an equilibrium individual state space may turn out to be trivial in the sense that every agent never escapes the binding common borrowing constraint. In this note, we extend and reinforce the proof of Lemma 3 in Huggett [1993]. By invoking a simple comparative-static argument, we establish that Huggett's result of a unique stationary equilibrium distribution of agents must be one that is nontrivial or nondegenerate.Compactness, Individual state space, Stationary distribution
Correlation of Eocene-Oligocene marine and continental records: orbital cyclicity, magnetostratigraphy and sequence stratigraphy of the Solent Group, Isle of Wight, UK
No full textThe magnetostratigraphy, clay mineralogy, cyclostratigraphy and sequence stratigraphy of the estuarine and continental Solent Group (Isle of Wight, Hampshire Basin, UK), which is of Late Eocene–Early Oligocene age, were investigated. A new magnetostratigraphy for the Solent Group is correlated to the chronostratigraphic standard using limited biostratigraphical data, and it is concluded that the base of the Oligocene falls close to the base of the Bembridge Limestone Formation. A long time-series of clay mineral XRD data was generated, which shows striking variation in illitic clay abundance. Illite is interpreted to have formed in gley palaeosols through repeated wetting and drying in response to high seasonality. High illitic clay values are tuned to c. 400 ka eccentricity maxima to develop an age model. In addition to a very strong c. 400 ka signal in the data, spectral analysis of the clay data also confirms the influence of short eccentricity (c. 100 ka) and obliquity (c. 40 ka) cycles. The succession displays seven conspicuous 10–20 m thick sequences, which represent transitions from transgressive estuarine environments through highstand floodplains to freshwater lakes. The sequences correspond exactly to the long eccentricity (c. 400 ka) cycles. A sea-level curve is derived using the amount of incision as a minimum measure of eustatic fall, but there is no evidence of a major eustatic drop of 30–90 m corresponding to the early Oligocene glaciation of Antarctica. It is likely that incision was suppressed by rapid rates of subsidence
Comparison of in situ and laboratory acoustic measurements on Lough Hyne marine sediments
No full textCompressional wave velocity and attenuation were measured at frequencies of 200–1500 Hz on seafloor sediments at Lough Hyne, Ireland, using a mini-boomer source and hydrophone array. Velocity and attenuation were also measured in the laboratory at 200–800 kHz on a 1 m long sediment core taken from the site. The in situ results indicate an average sediment phase velocity of about 1600 m/s and sediment quality factor of 10–20. The laboratory core measurements give an average phase velocity of 1793±26 m/s and quality factor of 16±5. The poorly sorted, Lough Hyne sediments are highly attenuating and highly dispersive when compared to values published in the literature for well-sorted, marine sediments such as clean sands and marine clays. The results are consistent with the few published data for poorly sorted sediments, and indicate that intrinsic attenuation is highest when the mass ratio of mud (clay + silt) to sand grade particles is close to unity. It is proposed that compliance heterogeneities are most abundant when mud and sand grade particles are present in roughly equal proportions, and that the observations support local viscous fluid flow as the most likely loss mechanism
The role of sediments in the storage, movement and biological uptake of Kepone in estuarine environments : annual report to the Environmental Protection Agency for the period 10/20/76 to 10/20/77
No full textIncluded in this document are three sections which describe the efforts of the Virginia Institute of Marine Science's staff on the Role of Sediments in the Storage, Movement,and Biological Uptake of Kepone in Estuarine Environments. The first section is entitled: "Kepone in James River Sediment," by Maynard M. Nichols and Richard C. Trotman. The second, "Kepone Water-Sediment Elutriates," by Robert J. Huggett and the third, ''Uptake of Kepone From Suspended Sediments by Oysters, Rangia and Macoma," is by Dexter S. Haven and Reinaldo Morales-Alamo. Also attached is a progress report on the EPA funded James River Hydrographical Survey Study which was conducted in the late summer of 1977.Virginia Institute of Marine Scienc
Modelling the influence of riverine inputs on the circulation and flushing times of small shallow estuaries
No full textSimple flushing time calculations for estuarine systems can be used as proxies for eutrophication susceptibility. However, more complex methods are required to better understand entire systems. Understanding of the hydrodynamics driving circulation and flushing times in small, eutrophic, temperate estuaries is less advanced than larger counterparts due to lack of data and difficulties in accurately modelling small-scale systems. This paper uses the microtidal Christchurch Harbour estuary in Southern UK as a case study to elucidate the physical controls on eutrophication susceptibility in small shallow basins. A depth-averaged hydrodynamic model has been configured of the estuary to investigate the physical processes driving circulation with particular emphasis on understanding the impact of riverine inputs to this system. Results indicate circulation control changes from tidally to fluvially driven as riverine inputs increase. Flushing times, calculated using a particle tracking method, indicate that the system can take as long as 132 h to flush when river flow is low, or as short as 12 h when riverine input is exceptionally high. When total river flow into the estuary is less than 30 m
3 s
−1, tidal flux is the dominant hydrodynamic control, which results in high flushing times during neap tides. Conversely, when riverine input is greater than 30 m
3 s
−1, the dominant hydrodynamic control is fluvial flux, and flushing times during spring tides are longer than at neaps. The methodology presented here shows that modelling at small spatial scales is possible but highlights the importance of particle tracking methods to determine flushing time variability across a system.
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Une nouvelle encyclopédie de géographie ou une copie de l'encyclopédie de Saint-Dié-des-Vosges ? Douglas I., Huggett R., Robinson M., Companion encyclopedia of Geography. The environment and humanland
No full textBailly Antoine S. Une nouvelle encyclopédie de géographie ou une copie de l'encyclopédie de Saint-Dié-des-Vosges ? Douglas I., Huggett R., Robinson M., Companion encyclopedia of Geography. The environment and humanland. In: Annales de Géographie, t. 106, n°596, 1997. pp. 435-437
Love under occupation: A personal journey through war, marriage and white Australia
No full textIn 1946, a devastated and defeated Japan was occupied by Australian forces based in the prefecture of Hiroshima. Noel Huggett, a young twenty-four year old fresh from fighting the Japanese in Bougainville during the Asia-Pacific War, was part of the first group of Australian troops to arrive with the tasks of demilitarising and democratising Japan. During Noel’s time there something unexpected happened. He met and fell in love with a Japanese woman, Reiko (Ruth)
Are the rights of people with disabilities included in international guidance on WASH during the COVID-19 pandemic? Briefing note
No full textThis briefing note is supported by the Australian Aid program Water for Women Fund. It draws on the article, currently under peer review: Scherer, N., Mactaggart, I., Huggett, C, Pheng, P., Rahman, M., Wilbur, J., Are the rights of people with disabilities included in international guidance on WASH during the COVID-19 pandemic? Content analysis using EquiFrame; BMJ Open 2021
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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