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826 results on '"Britton, S"'

8. Bluetongue disease in sheep in New South Wales – April 2023.

Author

Kirkland, PD, Finlaison, DS, Biddle, A, Parsons, M, Austin, H, Boland, S, Roach, G, McKinnon, R, Braddon, E, and Britton, S

Subjects
SHEEP diseases, BLUETONGUE, BLUETONGUE virus, EWES, SHEEP ranches, SYMPTOMS, EXERCISE tolerance
Abstract

In 2016, bluetongue virus (BTV), serotype 16 (BTV‐16), was detected in New South Wales (NSW) in sentinel cattle for the first time. Over the next 6 years, BTV‐16 has been detected regularly and over an increasing area of the BTV zone in NSW. In April 2023, disease was reported in sheep on two farms on the Northern Tablelands of NSW. The consistent clinical signs included reduced exercise tolerance, facial swelling, serous nasal discharges with encrustation of the nasal plane, subcutaneous oedema of the neck and brisket and variable congestion of the coronary band. Affected sheep were mainly mature ewes and rams, with an estimated morbidity of 20% over a period of 6–8 weeks. Although there were several unexpected deaths, no veterinary examination was sought. Predominantly BTV‐16 RNA was detected in sick sheep, with an incidence of infection of approximately 40% in a cross section of one flock. These events represent the first confirmation of disease due to bluetongue virus in NSW. As these cases occurred in a region with a high density of sheep, if there is ongoing transmission of BTV‐16 during subsequent summers, further disease might be expected. [ABSTRACT FROM AUTHOR]

Published
2024
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10. An Index to Measure the Ability of First Year Science Students to Transfer Mathematics

Author

Roberts, A. L., Sharma, M. D., Britton, S., and New, P. B.

Abstract

This project aimed to quantitatively measure the ability of first year science students to transfer their mathematical skills and knowledge to a physical context. An instrument used in earlier studies to measure transfer of mathematical knowledge was modified for this project, and tested with 49 student volunteers. This paper presents the Transfer Index, a novel way of measuring the degree of transfer of the students' mathematics skills and knowledge. It is demonstrated that the Transfer Index is a useful way of quantifying transfer and that it has predictive validity in a natural educational setting. (Contains 7 tables, 4 figures and 5 footnotes.)

Published
2007
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11. A Case Study of the Transfer of Mathematics Skills by University Students

Author

Britton, S., New, P. B., and Sharma, M. D.

Abstract

This paper describes the development of a procedure for investigating the ability of university students to employ their mathematical skills in a range of scientific contexts. This ability is called transfer. An instrument (consisting of a set of questions) to test transfer was designed jointly by three scientists and a mathematician and attempted by 47 students studying first-year science subjects at the University of Sydney. The instrument is described, and some of its strengths and weaknesses are discussed. The performances of the students on the instrument are analysed and interpreted, and a method by which each student's overall transfer ability may be quantified is suggested. Methods for determining a student's ability to transfer specific skills or items of mathematical knowledge are also described.

Published
2005

25. Recent Advances in Thermoplastic Puncture-Healing Polymers

Author

Gordon, K. L, Working, D. C, Wise, K. E, Bogert, P. B, Britton, S. M, Topping, C.C, Smith, J. Y, and Siochi, E. J

Subjects
Nonmetallic Materials
Abstract

Self-healing materials provide a route for enhanced damage tolerance in materials for aerospace applications. In particular, puncture-healing upon impact has the potential to mitigate significant damage caused by high velocity micrometeoroid impacts. This type of material also has the potential to improve damage tolerance in load bearing structures to enhance vehicle health and aircraft durability. The materials being studied are those capable of instantaneous puncture healing, providing a mechanism for mechanical property retention in lightweight structures. These systems have demonstrated healing capability following penetration of fast moving projectiles -- velocities that range from 9 mm bullets shot from a gun (approx.330 m/sec) to close to micrometeoroid debris velocities of 4800 m/sec. In this presentation, we report on a suite of polymeric materials possessing this characteristic. Figure 1 illustrates the puncture healing concept. Puncture healing in these materials is dependent upon how the combination of a polymer's viscoelastic properties responds to the energy input resulting from the puncture event. Projectile penetration increases the temperature in the vicinity of the impact. Self-healing behavior occurs following puncture, whereby energy must be transferred to the material during impact both elastically and inelastically, thus establishing two requirements for puncture healing to occur: a.) The need for the puncture event to produce a local melt state in the polymer material and b.) The molten material has to have sufficient melt elasticity to snap back and close the hole. 1,2 Previous ballistic testing studies revealed that Surlyn materials warmed up to a temperature approx.98 C during projectile puncture (3 C higher than it s melting temperature). 1,2 The temperature increase produces a localized flow state and the melt elasticity to snap back thus sealing the hole. Table 1 lists the commercially polymers studied here, together with their physical properties. The polymers were selected based on chemical structure, tensile strengths, tensile moduli, glass transition temperature, melting temperatures, and impact strength. The thermal properties of the polymers were characterized by Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA). Mechanical properties were assessed by a Sintech 2W instron according to ASTM D1708 or D638 at crosshead speeds of 5.08 cm/min. 7.6 cm x 7.6 cm panels of the different materials were prepared and ballistic testing was performed at various temperatures. The panels were shot with a .223 caliber semiautomatic rifle from a distance of 23 meters at various temperatures. Chronographs were used to measure initial and final bullet velocity. Temperatures at the site of impact were measured using a FLIR ThermaCAM S60 thermal camera. A Vision Research model Phantom 9 high speed video camera was used to capture high speed video footage of ballistics testing.

Published
2009

27. Group Study of the Middle East (Rebuttal).

Author

Britton, S. C.

Abstract

Offers a rebuttal to the cooperative-learning practices described in an earlier article in this journal which presented a Middle East history unit. Discusses students' basic lack of historical background, student expectations, the unit's organizational problems, and the way in which the students were overevaluated. Presents a rebuttal by the authors of the earlier article. (PRA)

Published
1992

45. Editorial Acknowledgment

Author

Aarvak, T., Abedi-Valugerdi, M., Abrahamsen, T., Akdis, C., Akuffo, H.O., Alarcon-Riquelme, M., Andersen, P., Arstila, P., Austgulen, R., Baecker-Allan, C., Baggiolini, M., Baker, B.S., Bakke, O., Bakken, V., Barclay, A.N., Bemark, M., Benestad, H.B., Berzins, K., Bjerkvik, R., Bjørge, L., Bland, P., Bolstad, A.I., Born, W., Bowman, S., Brinchmann, J., Britton, S., Brokstad, K.A., Brunet, L.R., Bruserud, Ø., Cardona, P.J., Ceyppens, J.L., Cirino, G., Cohn, M., Cox, R.J., Cunliffe, J., Dahlgren, U., Dellacasagrande, J., Ditzel, H., Dobryszycka, E., Dyrhol-Riise, A.M., Edwards, J.C., Egeland, T., Elsayed, S., Eray, M., Erb, K.J., Esch, T., Eugen-Olsen, J., Everse, L.A., Fagerhol, M., Farstad, I., Feldmann, M., Fernandez, C., Fleck, M., Franksson, R., Freitas, A., Garred, P., Gidlund, M., Gilhus, N.E., Goldbach-Mansky, R., Gordon, J., Gordon, T., Grandien, A., Gregerson, P., Grewal, H., Hakulinen, J., Halstensen, T., Haneberg, B., Hanej, S.H.E., Hansen, T., Harley, J.B., Haukenes, G., Hengartner, H., Henz, B.M., Holen, E., Hurme, M., Husby, G., Husby, S., Hörnqvist-Hultgren, E., Haaheim, L.R., Isenberg, D., Jahnson, F., Jakobsen, H., James, J.A., Jansson, J.O., Jarva, H., Jeansson, S., Johannessen, A.C., Johansen, F.E., Julkunen, I., Kalland, K.H., Kaye, J., Kazatchkine, M., Kihlström, E., Kohler, L., Konttinen, Y., Kotenko, S., Koutzov, S., Krammer, P., Kristoffersen, E., Kunzendorf, U., Lachmann, P., Langman, R., Langner, J., Lanzavecchia, L., Lappalainen, M., Laskay, T., Lea, T., Lefvert, A.K., Lehmann, A.C., Louka, A, Lúdviksson, B.R., Mariette, X., Marion, T., Marker-Herrmann, E., Mattsson, R., McAdam, S., Mellbye, O.J., Mellgren, G., Mellgren, S.I., Mestecky, J., Michaelsen, T., Michalek, S., Miettinen, A., Moestrup, S.K., Moretta, A., Moser, M., Mountz, J., Moutsopoulos, H., Munthe, L.A., Mustafa, T., Myrmel, H., Nannemark, G., Netea, M.G., Nilsen, R., Notarangelo, L.D., Ögmundsdóttir, H., Olsson, I., Olweus, J., Osland, A., Paludan, S.R., Parsons, K.R., Patarroyo, M., Paul, W.E., Perlman, P., Pollock, J.M., Puolakkainen, M., Quale, A., Rajewsky, K., Raman, C., Reichlin, M., Renkonen, R., Rese Shadidi, K., Ricciardi-Castagnoli, P., Rickinson, A.B., Ringdén, O., Risto, R., Rodinov, D., Rosenkrands, I., Rottenberg, M., Russel, M., Rygaard, J., Rødahl, E., Röllinghof, M., Sandberg, M., Schenk, K., Seppälä, I., Shevach, E., Shortman, K., Siegrist, C.A., Sigurdardóttir, S., Silvennoinen, O., Sinigaglia, F., Sistonen, L., Skarstein, K., Skogh, T., Smith, E., Spurkland, A., Stendahl, O., Sugden, B., Suri-Payer, E., Svennerholm, A.M., Szodoray, P., Theofilopoulos, A., Thorley-Lawson, D.A., Timonen, T., Trowsdale, J., Tuomo, T., Ulmer, A.J., Ulvestad, E., Ulvik, R., Vaerman, J.P., van, der Merwe J.P., van Eden, W., Vedeler, C., Vintermyr, O.K., Vyse, J., Wahlgren, M., Wahren-Herlenius, M., Walsh, L.J., Weetman, A.P., Westermark, P., Wiker, H., Yang, J., Yewdell, J.W., Youinou, P., and Zouali, M.

Published
2002

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