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Search Results: 1 - 10 of 3583 matches for " Colin Webb "
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Acetate in Oz: Some Strategic Moves
Colin Webb
Liber Quarterly : The Journal of European Research Libraries , 2005,
Abstract: I would like to add my voice to the words of congratulations and thanks to the British Library for organising this forum, and for their generosity in making it possible for me to come across the world to be part of it. The issues we are discussing today have an importance extending beyond cellulose acetate, as they reflect our ability as custodians to deal with common threats to the documentary heritage we are charged with preserving. As I will argue later, we need to see this situation in the context of the full range of preservation management issues that face our institutions. While it imposes a burden and a challenge on us as preservation managers, it also presents opportunities to sort out some things that have needed attention for some time. I have been asked to talk about problems with cellulose acetate microfilm collections in Australia, and specifically the strategies – both national and local – that have been adopted or at least explored in response to those problems. In the time I have I will not be going into any of these in great detail, but I hope I can give you some sense of the situation down under, and perhaps draw out a few issues that might make this more than just an ‘us too’ session! One thing to emphasise from the start is that we have had a number of goes at dealing with acetate microfilm collections: it is not a newly discovered problem in Australia. One significant context in which we have been working is that of a national strategy for all kinds of cellulose acetate collection materials. Explaining this national strategy will form a major part of my presentation, with issues and approaches specific to microfilm discussed towards the end.
Evaluation of Recycle Grinding Performance in Flour Milling
Siti Mazlina Mustapa Kamal,Colin Webb
Journal of Applied Sciences , 2007,
Abstract: A typical flour milling process is a very linear operation that is almost entirely void of recycled streams where separate fractions from each operation go ahead as new streams to the next operation. In some cases, there are opportunities for combining some streams, for recycling particles that have been insufficiently broken to go back to the same roller mill. This study introduces this recycle concept in flour milling process at second break system. The recycle grinding assessment was made using a Satake STR-100 test roller mill. The recycle process was started after the second break system and the number of recycle grinding was up to 7 regrinds. The particle size distribution and ash analysis were produced to describe the behaviour of the recycle grinding performance. The material release was sifted on a range of sieves and the ash content was analysed using a laboratory furnace. The performance for each recycle stage was investigated. It was determined that it is possible for some coarse particles that contain only bran to keep being recycled in the recycle circuit. A purging operation was recommended to be included in the recycle system, to separate the unwanted particles.
The Good, the Bad, and the Ugly: Agonistic Behaviour in Juvenile Crocodilians
Matthew L. Brien, Jeffrey W. Lang, Grahame J. Webb, Colin Stevenson, Keith A. Christian
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0080872
Abstract: We examined agonistic behaviour in seven species of hatchling and juvenile crocodilians held in small groups (N = 4) under similar laboratory conditions. Agonistic interactions occurred in all seven species, typically involved two individuals, were short in duration (5–15 seconds), and occurred between 1600–2200 h in open water. The nature and extent of agonistic interactions, the behaviours displayed, and the level of conspecific tolerance varied among species. Discrete postures, non-contact and contact movements are described. Three of these were species-specific: push downs by C. johnstoni; inflated tail sweeping by C. novaeguineae; and, side head striking combined with tail wagging by C. porosus. The two long-snouted species (C. johnstoni and G. gangeticus) avoided contact involving the head and often raised the head up out of the way during agonistic interactions. Several behaviours not associated with aggression are also described, including snout rubbing, raising the head up high while at rest, and the use of vocalizations. The two most aggressive species (C. porosus, C. novaeguineae) appeared to form dominance hierarchies, whereas the less aggressive species did not. Interspecific differences in agonistic behaviour may reflect evolutionary divergence associated with morphology, ecology, general life history and responses to interspecific conflict in areas where multiple species have co-existed. Understanding species-specific traits in agonistic behaviour and social tolerance has implications for the controlled raising of different species of hatchlings for conservation, management or production purposes.
Agency at Work: A Dynamic Interpretive Approach  [PDF]
Colin Campbell
Sociology Mind (SM) , 2012, DOI: 10.4236/sm.2012.24047
Abstract: Roy’s 1950s paper “Banana Time” is used as the basis for an exploration of the nature and relationship of agency and action. Roy’s activity in playing his “game of work” is shown to be a feature of individual conduct that, despite possessing subjective meaning, is largely neglected by contemporary sociologists, mainly because of its covert character. What an examination of this aspect of his conduct suggests is the need to revise the conventional observational approach to the definition of the unit act by recognising that there may well be an additional actor’s covert definition sitting within the accepted social definition and that it is therefore necessary to use the criterion of attentionality to identify the unit act. An analysis of Roy’s game of work also helps to shed light on the possible relationship between action and agency, revealing that while the power of agency enables individuals to act, it is also frequently necessary for individuals to act in order to maintain or restore their power of agency. Finally, a consideration of the function fulfilled by Roy’s game of work shows that a behaviourist-style stimulus-response analysis of conduct is not at odds either with voluntarism or the adoption of the actor’s standpoint. This is because Roy demonstrates how actors are themselves lay behaviourists, fully aware of how they need to manipulate stimuli in order to produce desired responses in themselves.
Saving Lives: Timely Flash Flood Warnings in the UK  [PDF]
Colin Clark
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.52005
Flash floods are a major cause of death and destruction to property on a worldwide scale. In the UK sudden flooding has been the cause of the loss of over 60 lives during the last century. Forecasting these events to give enough warning is a major concern: after the 2004 flood at Boscastle, Cornwall UK the Environment Agency (2004) stated that it was not possible to provide a warning in such a fast reacting and small catchment. This is untrue since the Agency had already implemented a real time non-linear flow model as part of a flood warning system on the upper Brue in Somerset UK. This model is described in this paper as it has been applied to the Lynmouth flood of 1952, and briefly for the Boscastle catchment, both of which have an area of about 20 km2. The model uses locally measured SMD and saturated hydraulic conductivity data. With the addition of further parameters the model has been successfully used nationwide.
The Value of Using Unofficial Measurements of Rainfall: The Dublin Storm and Flood of June 1963  [PDF]
Colin Clark
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.72006
Abstract: Rainfall measurements are vital for the design of hydraulic structures, climate change studies, irrigation and land drainage works. The most important source of design rainfall data comes from convective storms. Accurate assessment of the storm rainfall requires a fairly dense network of raingauges. In 1963, such a storm took place over Dublin in Ireland. However, the existing raingauge network was insufficient to identify both the depth and pattern of rainfall. An appeal was made by Met Eireann for additional unofficial rainfall data. The result was remarkable in that the estimated maximum rainfall depth was found to be more than double the official value and that the resulting depth area analysis suggested a rainfall volume over a large area much bigger than the original isohyet map indicated. This result has huge implications for the estimation of maximum rainfall and dam safety assessment, especially in countries where the raingauge network has a low density. This paper first provides a description of the synoptic conditions that led to the storm, second an analysis of the rainfall data and how the unofficial measurements produced a very different depth area relationship; third, the social consequences of the resulting flood are described. Fourth, the storm is then placed in the context of other storms in the British Isles Finally the implications for rainfall measurement, gauge density and an example of how revised estimates of probable maximum precipitation (PMP) have been used to improve the safety and design standard of a flood detention dam are discussed.
Introducing discussion into multilingual mathematics classrooms: An issue of code switching?
Lyn Webb,Paul Webb
Pythagoras , 2011, DOI: 10.4102/pythagoras.v0i67.71
Abstract: The Department of Education in South Africa advocates collaborative and constructivist learning; however, observations indicate that little discussion occurs in most multilingual mathematics classes. In this paper we draw on a pilot study set in the Eastern Cape where teachers were introduced to the theory and practice of exploratory talk, and then tasked to perform an action research project on introducing discussion in their own multilingual mathematics classrooms. The results of the study suggest some successes in terms of teachers initiating exploratory talk and highlight the fact that these successes were only achieved where code switching between English and isiXhosa formed an integral part of the process.
A snapshot in time: Beliefs and practices of a pre-service mathematics teacher through the lens of changing contexts and situations
Lyn Webb,Paul Webb
Pythagoras , 2011, DOI: 10.4102/pythagoras.v33i68.66
Abstract: For the last decade research on teachers’ beliefs has made a distinction between mathematics teachers’ professed and attributed beliefs (practice) and studies have either found some or no correlation between the two. In this paper we investigate the beliefs and practices of a novice teacher and conclude that inconsistency between beliefs and practices may be an observer’s perspective that is not necessarily shared by the teacher, and that the view that there is a possible disjuncture does not do justice to the complexity of the practitioner’s tasks nor to the rapidly changing contexts and situations that may occur within a single lesson.
Eastern Cape teachers’ beliefs of the nature of mathematics: Implications for the introduction of in-service mathematical literacy programmes for teachers
Lyn Webb,Paul Webb
Pythagoras , 2011, DOI: 10.4102/pythagoras.v33i4.122
Abstract: Various studies have shown that what teachers consider to be optimal ways of teaching mathematics is influenced by their beliefs about the nature of mathematics, and that it is advantageous to determine teachers’ conceptions of the nature of mathematics before developing curriculum interventions. With the imminent introduction of Mathematical Literacy in the FET phase in South Africa this study provides a snapshot of beliefs of teachers in the Eastern Cape, South Africa. Various methods were employed to stimulate teachers to both reflect on their beliefs and to make them explicit. A questionnaire was administered to 339 in-service teachers in urban and rural areas of the Eastern Cape. A sample of ninety-five of these teachers completed a second questionnaire based on videotapes of lessons recorded during the TIMSS (1995) study that they had viewed. These teachers also ranked their own teaching on a continuum ranging from traditional to constructivist approaches and provided explanations for their ranking. A further sub-sample of thirty-six teachers participated in individual interviews, which explored their perceptions of the nature of mathematics and their own teaching practice. In order to investigate whether these beliefs were mirrored in practice, four teachers were observed and videotaped in their classrooms. The data generated by this study suggest that the participating teachers’ espoused beliefs of the nature of mathematics tended to be innovative, and correlated with innovative views of teaching and learning; however these views were often not reflected in their practice. The implications that the apparent inability of teachers to translate their beliefs into practice have for the introduction of a contextual, problem-based Mathematical Literacy curriculum for teachers is explored.
On Some Numbers Related to the Erdös-Szekeres Theorem  [PDF]
Mark J. Nielsen, William Webb
Open Journal of Discrete Mathematics (OJDM) , 2013, DOI: 10.4236/ojdm.2013.33030

A crossing family of segments is a collection of segments each pair of which crosses. Given positive integers j and k,a(j,k) grid is the union of two pairwise-disjoint collections of segments (with j and k members, respectively) such that each segment in the first collection crosses all members of the other. Let c(k) be the least integer such that any planar set of c(k) points in general position generates a crossing family of k segments. Also let #(j,k) be the least integer such that any planar set of #(j,k) points in general position generates a (j,k)-grid. We establish here the facts 9≤c(3)≤16 and #(1,2)=8.

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