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Selected AbstractsNot by Rent Alone: Analysing the Pro-Poor Functions of Small-Scale Fisheries in Developing CountriesDEVELOPMENT POLICY REVIEW, Issue 3 2010Christophe Béné The dominant view in academic and policy arenas is increasingly one in which the major contribution of capture fisheries to development should be derived from the capacity of society to maximise the economic rent of fishery resources. Drawing upon empirical experience from the South, this article highlights the potentially disastrous consequences that a universal implementation of the rent-maximisation model would have in developing countries, and argues that a more gradual approach would be preferable. The welfare function of small-scale fisheries, namely, their capacities to provide labour and cash income to resource-poor households, should be preserved until the appropriate macroeconomic conditions for rent-maximisation and redistribution are fulfilled. [source] Safety Nets and Opportunity Ladders: Addressing Vulnerability and Enhancing Productivity in South AsiaDEVELOPMENT POLICY REVIEW, Issue 5 2002Naila Kabeer As patterns of poverty and vulnerability in South Asia change, households have to balance immediate needs and long,term goals. For the poor, these choices, and the costs of precautionary measures, are particularly acute and call for suitable government policies. While policy,makers face a number of trade,offs between promotion, prevention and protection goals, careful design can maximise the potential to reconcile these objectives. A review of experience suggests a number of lessons regarding the relative benefits of targeted and universal programmes; the need to differentiate microfinance products for different groups amongst the poor; ways of basing the self,targeting of public works on rights rather than stigma; and the influence of political processes (such as decentralisation) for the overall effectiveness of social protection. [source] Models of policy-making and their relevance for drug researchDRUG AND ALCOHOL REVIEW, Issue 4 2010ALISON RITTER Abstract Introduction and Aims. Researchers are often frustrated by their inability to influence policy. We describe models of policy-making to provide new insights and a more realistic assessment of research impacts on policy. Design and Methods. We describe five prominent models of policy-making and illustrate them with examples from the alcohol and drugs field, before drawing lessons for researchers. Results. Policy-making is a complex and messy process, with different models describing different elements. We start with the incrementalist model, which highlights small amendments to policy, as occurs in school-based drug education. A technical/rational approach then outlines the key steps in a policy process from identification of problems and their causes, through to examination and choice of response options, and subsequent implementation and evaluation. There is a clear role for research, as we illustrate with the introduction of new medications, but this model largely ignores the dominant political aspects of policy-making. Such political aspects include the influence of interest groups, and we describe models about power and pressure groups, as well as advocacy coalitions, and the challenges they pose for researchers. These are illustrated with reference to the alcohol industry, and interest group conflicts in establishing a Medically Supervised Injecting Centre. Finally, we describe the multiple streams framework, which alerts researchers to ,windows of opportunity', and we show how these were effectively exploited in policy for cannabis law reform in Western Australia. Discussion and Conclusions. Understanding models of policy-making can help researchers maximise the uptake of their work and advance evidence-informed policy.[Ritter A, Bammer G. Models of policy-making and their relevance for drug research. Drug Alcohol Rev 2010] [source] Evidence-based policy or policy-based evidence?DRUG AND ALCOHOL REVIEW, Issue 4 2007The role of evidence in the development, implementation of the Illicit Drug Diversion Initiative Abstract Issues. Evidence-based policy is promoted as the ideal in drug policy, yet public policy theorists suggest that policy-based evidence may be a more fitting analogy, where evidence is used selectively to support a predetermined policy direction. Approach. The following paper assesses the resonance of this notion to the development of the Illicit Drug Diversion Initiative (IDDI), an apparently pragmatic reform adopted in Australia in 1999 through the Federal Coalition ,Tough on Drugs' strategy. It utilises interviews with key informants from the Australian drug policy arena conducted in 2005 to assess the role of evidence in the design and implementation of the IDDI. Key Findings. The current paper shows that while policy-makers were generally supportive of the IDDI and viewed drug diversion as a more pragmatic response to drug users, they contend that implementation has suffered through a selective and variable emphasis upon evidence. Most notably, the IDDI is not premised upon best-practice objectives of reducing harm from drug use, but instead on ,Tough on Drugs' objectives of reducing drug use and crime. Implications. This paper contends that policy-based evidence may facilitate the adoption of pragmatic reforms, but reduce the capacity for effective reform. It therefore has both functional and dysfunctional elements. Conclusion. The paper concludes that greater attention is needed to understanding how to mesh political and pragmatic objectives, and hence to maximise the benefits from policy-based evidence. [Hughes CE. Evidence-based policy or policy-based evidence? The role of evidence in the development and implementation of the Illicit Drug Diversion Initiative. Drug Alcohol Rev 2007;26:363,368] [source] Mismatch between the timing of oviposition and the seasonal optimum.ECOLOGICAL ENTOMOLOGY, Issue 3 2010The stochastic phenology of Mediterranean acorn weevils 1. The timing of reproduction is predicted to match the period of maximum food availability. In this sense, the case of many phytophagous insects in temperate regions is very illustrative, as their larvae usually depend on a resource only available for a limited period of time each year. 2. For 3 years the interactions between the weevil Curculio elephas and the Mediterranean Holm oak Quercus ilex were studied. Weevil larvae grow within the acorns, feeding on the cotyledons. The timing of oviposition will determine food availability for the larvae, as acorns stop growing once they are attacked. 3. Acorn temporal growing patterns did not change between years and food availability for larvae was at its highest in October, when temperature was still suitable for larval development. However, oviposition phenology did change between years. In 2002 females oviposited later, larvae grew within larger acorns, and their body mass was significantly higher than in 2003 or 2004, when females oviposited into early acorns. 4. Thus, weevils do not always adjust oviposition to the best possible feeding conditions for their offspring. Rather, they seem to maximise their own lifetime fitness, ovipositing as soon as they emerge in late summer. Emergence, in turn, depends strongly on stochastic events such as summer storms in the Mediterranean region. 5. Under a climate change perspective, the trend towards higher August rainfall recorded in our study area may alter oviposition phenology, with the subsequent cascade effects on weevil body size and fitness [source] Age-dependent clutch size in a koinobiont parasitoidECOLOGICAL ENTOMOLOGY, Issue 1 2005Jelmer A. Elzinga Abstract., 1. The Lack clutch size theory predicts how many eggs a female should lay to maximise her fitness gain per clutch. However, for parasitoids that lay multiple clutches it can overestimate optimal clutch size because it does not take into account the future reproductive success of the parasitoid. 2. From egg-limitation and time-limitation models, it is theoretically expected that (i) clutch size decreases with age if host encounter rate is constant, and (ii) clutch size should increase with host deprivation and hence with age in host-deprived individuals. 3. Clutch sizes produced by ageing females of the koinobiont gregarious parasitoid Microplitis tristis Nees (Hymenoptera: Braconidae) that were provided daily with hosts, and of females ageing with different periods of host deprivation were measured. 4. Contrary to expectations, during the first 2 weeks, clutch size did not change with the age of the female parasitoid, neither with nor without increasing host-deprivation time. 5. After the age of 2 weeks, clutch size decreased for parasitoids that parasitised hosts daily. The decrease was accompanied by a strong decrease in available eggs. However, a similar decrease occurred in host-deprived parasitoids that did not experience egg depletion, suggesting that egg limitation was not the only factor causing the decrease in clutch size. 6. For koinobiont parasitoids like M. tristis that have low natural host encounter rates and short oviposition times, the costs of reproduction due to egg limitation, time limitation, or other factors are relatively small, if the natural lifespan is relatively short. 7. Koinobiont parasitoid species that in natural situations experience little variation in host density and host quality might not have strongly evolved the ability to adjust clutch size. [source] The effect of training on stride parameters in a cohort of National Hunt racing Thoroughbreds: A preliminary studyEQUINE VETERINARY JOURNAL, Issue 5 2009M. FERRARI Summary Reasons for performing study: The influence of training on stride parameters is controversial and to date there is no information on how training influences stride parameters during high-speed locomotion in the field. Objective: To determine the influence of training on stride variables during high-speed locomotion in Thoroughbred racehorses. Methods: Speed, stride frequency, stance and protraction times were quantified in 8 Thoroughbreds with foot mounted accelerometers and GPS sensors during their first week of canter after the summer break and 6 months into training. Results: At a speed of 11 m/s, stride frequency was (mean ± s.d.) 2.160 ± 0.120 strides/s pre- and 2.167 ± 0.083 strides/s post training; mean stance time was 125.3 ± 9 ms pre- and 125.9 ± 7 ms post training; protraction time was 340.7 ± 20.4 ms pre- and 337.2 ± 14.3 ms post training. The increase in stride frequency and the decrease in protraction time after training were significant. There was no statistically significant difference in the maximum speed reached by each horse pre- and post training. Conclusions: Stance time stayed constant throughout the training season in the tested horses. A significant decrease in protraction time and a corresponding significant increase in stride frequency were observed after training. Potential relevance: Training of racehorses could be adapted to maximise the effect on modifiable parameters and reduce the risk of training-induced pathologies. Further research will be conducted to investigate the effect of different training protocols on a large number of horses. [source] Value Maximisation, Stakeholder Theory, and the Corporate Objective FunctionEUROPEAN FINANCIAL MANAGEMENT, Issue 3 2001Michael Jensen This paper examines the role of the corporate objective function in corporate productivity and efficiency, social welfare, and the accountability of managers and directors. I argue that since it is logically impossible to maximise in more than one dimension, purposeful behaviour requires a single valued objective function. Two hundred years of work in economics and finance implies that in the absence of externalities and monopoly (and when all goods are priced), social welfare is maximised when each firm in an economy maximises its total market value. Total value is not just the value of the equity but also includes the market values of all other financial claims including debt, preferred stock, and warrants. In sharp contrast stakeholder theory, argues that managers should make decisions so as to take account of the interests of all stakeholders in a firm (including not only financial claimants, but also employees, customers, communities, governmental officials and under some interpretations the environment, terrorists and blackmailers). Because the advocates of stakeholder theory refuse to specify how to make the necessary tradeoffs among these competing interests they leave managers with a theory that makes it impossible for them to make purposeful decisions. With no way to keep score, stakeholder theory makes managers unaccountable for their actions. It seems clear that such a theory can be attractive to the self interest of managers and directors. Creating value takes more than acceptance of value maximisation as the organisational objective. As a statement of corporate purpose or vision, value maximisation is not likely to tap into the energy and enthusiasm of employees and managers to create value. Seen in this light, change in long-term market value becomes the scorecard that managers, directors, and others use to assess success or failure of the organisation. The choice of value maximisation as the corporate scorecard must be complemented by a corporate vision, strategy and tactics that unite participants in the organisation in its struggle for dominance in its competitive arena. A firm cannot maximise value if it ignores the interest of its stakeholders. I offer a proposal to clarify what I believe is the proper relation between value maximisation and stakeholder theory. I call it enlightened value maximisation, and it is identical to what I call enlightened stakeholder theory. Enlightened value maximisation utilises much of the structure of stakeholder theory but accepts maximisation of the long run value of the firm as the criterion for making the requisite tradeoffs among its stakeholders. Managers, directors, strategists, and management scientists can benefit from enlightened stakeholder theory. Enlightened stakeholder theory specifies long-term value maximisation or value seeking as the firm's objective and therefore solves the problems that arise from the multiple objectives that accompany traditional stakeholder theory. I also discuss the Balanced Scorecard, the managerial equivalent of stakeholder theory. The same conclusions hold. Balanced Scorecard theory is flawed because it presents managers with a scorecard which gives no score,that is, no single-valued measure of how they have performed. Thus managers evaluated with such a system (which can easily have two dozen measures and provides no information on the tradeoffs between them) have no way to make principled or purposeful decisions. The solution is to define a true (single dimensional) score for measuring performance for the organisation or division (and it must be consistent with the organisation's strategy). Given this we then encourage managers to use measures of the drivers of performance to understand better how to maximise their score. And as long as their score is defined properly, (and for lower levels in the organisation it will generally not be value) this will enhance their contribution to the firm. [source] A retrospective study of shared learning on the BMedSci Dental Technology course at The University of SheffieldEUROPEAN JOURNAL OF DENTAL EDUCATION, Issue 4 2000Giuseppe Cannavina The aim of this study was to identify the level of shared learning on a Bachelor of Medical Science in Dental Technology (BMedSci) course at the University of Sheffield, School of Clinical Dentistry. A summative evaluation of the course was carried out, using semi-structured nominal group interviews. BMedSci students, BDS students and recent graduates were questioned and their answers analysed to identify shared learning activities. The results revealed that different levels of shared learning opportunities occurred within the different departments which delivered the course modules. Shared learning was viewed favourably by the students. It has the potential to maximise the use of resources and offers the opportunity for developing an integrated dental team. [source] The Illegal Way In and The Moral Way OutEUROPEAN JOURNAL OF PHILOSOPHY, Issue 2 2007Gerhard Øverland At the heart of the current debate about immigration we find a conflict of convictions. Many people seem to believe that a country has a right to decide who to let in and who to keep out, but quite often they appear equally committed to the view that it is morally wrong to expel someone from within the borders of their country if that would seriously jeopardise the person in question. While the first conviction leads to stricter border controls in an attempt to prevent would-be immigrants from entering the country illegally, the latter conviction ensures that aliens with a legitimate claim on protection will not be removed forcibly. It is not strange, therefore, that the task of pinning down a morally sound immigration policy is such an elusive enterprise. In this paper I take it for granted that no electorate would be prepared to accept the kind of policy they ought to, and that we in consequence will continue to let in as few immigrants as is currently the case. Given this constraint I argue against two common assumptions concerning a viable immigration policy. First, granted that certain conditions are satisfied, professional smugglers should not face legal sanctions for bringing asylum seekers to a potential host country. Second, countries that limit immigration should not treat people seeking family reunion preferentially or on a par with other immigrants, but rather act so as to maximise the number of refugees allowed to enter. [source] Variable-length channel coding with noisy feedbackEUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 4 2008Stark C. Draper It is known that perfect noiseless feedback can be used to improve the reliability of communication systems. We show how to make those gains robust to noise on the feedback link. We focus on feedback links that are themselves discrete memoryless channels. We demonstrate that Forney's erasure-decoding exponent is achievable given any positive-capacity feedback channel. We also demonstrate that as the desired rate of communication approaches the capacity of the forward channel, the Burnashev upper bound on the reliability function is achievable given any positive-capacity noisy feedback channel. Finally, we demonstrate that our scheme dominates the erasure-decoding exponent at all rates and, for instance, at zero rate can achieve up to three-quarters of Burnashev's zero-rate reliability. This implies that in a shared medium, to maximise the reliability function some degrees of freedom should be allocated to feedback. Copyright © 2008 John Wiley & Sons, Ltd. [source] Choosing the parameters of multiple-repetition strategies,EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 3 2007Thijs Veugen The class of multiple-repetition strategies is known to achieve capacity for specific discrete memoryless channels with noiseless feedback. We show, given an arbitrary discrete memoryless channel with noiseless feedback, that the repetition parameters should be chosen close to the self information of a transmission error to maximise the transmission rate. Furthermore, it is indicated how close the channel capacity can be approached in the general case. Finally, we compare some results on a related problem: the capacity of a discrete noiseless channel with constraints on the input symbols. Copyright © 2006 AEIT [source] Fish utilisation of managed realignmentsFISHERIES MANAGEMENT & ECOLOGY, Issue 6 2005S. COLCLOUGH Abstract, One area of ecological benefit not yet fully evaluated in European waters is the utilisation of restored saltmarsh habitats by fish species. This study examines the utilisation of managed realignments and relic saltmarsh by fish species. Factors affecting habitat heterogeneity and fish populations are discussed, and recommendations are made with respect to scheme design and management that will maximise the biological and socio-economic values. Fish populations in the high intertidal areas were assessed using a suite of techniques, including observations on feeding behaviour. Each microhabitat was discussed as a function of the extent of fish colonisation. A positive relationship between the degree of fish utilisation and habitat heterogeneity was ascertained using species richness, abundance and behavioural observations. This study will aid habitat valuation for economic justification of managed realignments, over and above existing drivers, such as compensatory habitat for encroachment, flood defence and the European Union Habitats Directive. The work now forms part of a wider European Interreg IIIb project, COMCOAST. [source] An audit of intra-oral digital radiographs for endodonticsINTERNATIONAL ENDODONTIC JOURNAL, Issue 4 2010R. Austin Aim, The aim of this study was to improve the quality of digital radiographs taken during endodontic treatment at King's College Hospital Dental Institute, UK. There were three phases. The first phase compared the Schick CDR system with Digora Optime. The second and third phases involved ways of improving the quality of the digital radiographs produced by the Schick CDR system. Methodology, The Faculty of General Dental Practitioners Royal College of Surgeons of England (FGDP) guidelines on Selection Criteria for Dental Radiography and Guidance Notes for Dental Practitioners on the Safe Use of X-Ray Equipment-National Radiological Protection Board enabled the use of a three point quality scale (one excellent, two diagnostically acceptable, three unacceptable), which took into consideration sensor angulation, positioning, contrast and focusing. The recommended FGDP guidelines are not less than 70% images scoring excellent. For the first phase 50 exposures recorded with the Schick CDR system were compared with 50 recorded using Digora Optime. For the second and third phases 50 radiographs for each phase were evaluated with images generated by the Schick system with training provided between the phases. Results, Images produced by the Schick system showed an inferior quality compared with the images generated by the Digora method. Both systems failed to reach the desired quality FGDP standard of 70% excellent (Schick 55% Digora 69%). Comparison of the results in the second and third phases showed that training the operator improved the quality but recommended the purchase of a size 1 or 0 Schick sensors to improve positioning errors. Conclusions, This study was carried out in order to minimise the ionising radiation dose to patients and to maximise the clinical and administrative benefits of using a digital system. It demonstrated an improvement in the quality of radiographs across all criteria measured up to and beyond the desired standard, from 55% of radiographs scoring excellent in the first phase to 80% in the third phase. As a result of the study it was decided to install the Schick CDR system because of the speed it produced images even though the first phase of this study demonstrated inferior image quality. The audit had clear, measurable standards with explicit targets. The audits have been through the entire audit cycle, data collection, change and a further data collection to provide evidence of the benefit of the change. A third data collection, demonstrated an ongoing commitment to quality. [source] Follicular thyroid carcinoma: metastasis to the sternum, 13 years after total thyroidectomyINTERNATIONAL JOURNAL OF CLINICAL PRACTICE, Issue 11 2006A. EROGLU Summary Primary and metastatic malignancies of the sternum are uncommon. Secondary lesions to the sternum occur more commonly in patients with lung and breast cancer, and only a few cases of sternal metastasis arising from a follicular thyroid carcinoma have been reported in the literature. Rarely, metastases to the sternum present in the guise of primary sternal tumours may be treated surgically with that diagnosis in mind. We describe a case of a sternal mass treated by radical surgery, which ultimately proved to be a solitary metastasis from a follicular carcinoma of the thyroid, appearing 13 years after total thyroidectomy and radioactive iodine therapy. Late metastatic thyroid carcinoma to the sternum should be kept in mind in the differential diagnosis of sternal lesions. For patients with thyroid carcinoma and sternal metastasis, we recommend surgical resection of the metastasis, not only as a curative or palliative measure but also to maximise the effect of subsequent radioiodine treatment. [source] Fat, wheat bran and salt effects on cooking properties of meat patties studied by response surface methodologyINTERNATIONAL JOURNAL OF FOOD SCIENCE & TECHNOLOGY, Issue 10 2010Hasibe Tekin Summary Response surface methodology was used to investigate the main effects and interactions of composition (processing) variables such as fat (10,30%), wheat bran (5,15%) and NaCl (0,2%) on cooking properties of beef patties. In addition, the ridge analysis was conducted to find the values of processing variables that maximise and minimise the cooking parameters (moisture retention, fat retention, reduction in thickness, reduction in diameter, cooking yield, shrinkage and water-holding capacity). It was found that the moisture and fat retention, reduction in thickness and cooking yield values decreased; however, reduction in diameter and shrinkage values increased, respectively, as the amount of fat increased. However, wheat bran addition increased fat retention, moisture retention, cooking yield and water-holding capacity values of the patties. Increasing NaCl levels decreased water-holding capacity value by its quadratic effect and moisture and fat retention value by its interaction effect with wheat bran. [source] The marketing effectiveness of UK environmental charity websites compared to best practiceINTERNATIONAL JOURNAL OF NONPROFIT & VOLUNTARY SECTOR MARKETING, Issue 3 2003Kate Wenham All nonprofit organisations need to give attention to their marketing strategies in order to maximise the funding and support they receive and the numbers using their services. The web offers a new communications medium with which to achieve this. This paper compares suggested best practice approaches to web marketing using the websites of UK environmental charities as a type of nonprofit organisation. Copyright © 2003 Henry Stewart Publications [source] Relationship marketing, audience retention and performing arts organisation viabilityINTERNATIONAL JOURNAL OF NONPROFIT & VOLUNTARY SECTOR MARKETING, Issue 2 2002Ruth Rentschler Marketing strategy in performing arts organisations has become particularly important in the increasingly competitive environment in which the arts operate. Since the late 1980s there has been a necessary shift in focus to audience development away from product development. This change in focus is being encouraged to ensure the long-term viability of performing arts organisations (PAOs) and micro-economic reform. While government reports have recommended strategies aimed at building audience-based recognition, this is an expensive approach for many PAOs and does not produce short-term returns. Little attention has been paid to building enduring relationships with existing audiences as a way of having a more dramatic impact on PAOs' long-term viability. This paper explores this theme through relationship marketing and the implication of retaining existing audiences. The paper identifies the changing cultural environment which has led to the importance of marketing. It then explains the concepts of relationship marketing and its pertinence to PAOs' viability by presenting a loyalty ladder. The structure is modelled as a dynamic conceptualisation of the relationships (audience and organisation) to assist arts managers to decide whether to focus their efforts on catching or keeping customers to maximise earned income. Copyright © 2002 Henry Stewart Publications [source] Information and Economics in Fisher's Design of ExperimentsINTERNATIONAL STATISTICAL REVIEW, Issue 2 2007John Aldrich Summary In 1951 R. A. Fisher described what had been achieved in the 20th century so far: "we have learnt (i) To conserve in its statistical reduction the scientific information latent in any body of observations. (ii) To conduct experimental and observational inquiries so as to maximise the information obtained for a given expenditure." This paper asks what Fisher meant and, in particular, how he saw his work on experimental design as contributing to the objective of maximizing information for a given expenditure. The material examined ranges from detailed work on issues like "the information lost in measurement of error" to polemics against decision theory. Résumé En 1951 R.A. Fisher décrivait ce qui avait été accompli jusque là au 20ème siécle: "nous avons appris (i) à conserver dans sa réduction statistique l'information scientifique latente dans tout ensemble d'observations (ii) de conduire des investigations expérimentales et observationnelles de façon à maximiser l'information obtenue pour une dépense donnée." Cet article se demande ce que Fisher voulait dire et, en particulier, comment il voyait son travail de conception expérimentale comme contribution à l'objectif de maximiser l'information pour une dépense donnée. Les matériaux examinés vont des travaux détaillés sur des questions telles que "l'information perdue dans la mesure de l'erreur" jusqu'aux polémiques contre la théorie de la décision. [source] Repeated grazing of a salt marsh grass by moulting greylag geese Anser anser, does sequential harvesting optimise biomass or protein gain?JOURNAL OF AVIAN BIOLOGY, Issue 1 2003Anthony D. Fox The effects of simulated goose grazing on common saltmarsh-grass Puccinellia maritima plants were tested on a Danish salt marsh during the flightless moulting period of greylag geese Anser anser (3,21 June 1998). Plants in an area exclosed from the influence of grazing and the nutrient effects of goose faeces were subject to removal of youngest lamina at 3-, 6-, 9- and 18-day intervals during this period. Average biomass and protein accumulation between harvests was highest at defoliation intervals of 9 days or more. Field observations from two separate study areas demonstrated geese returned to regraze the Puccinellia sward after 6,8 days and oesophageal contents from feeding geese showed selection for lamina lengths consistent with the results of clipping every 6 days. Geese therefore regrazed Puccinellia patches at shorter intervals than expected were they to maximise their intake of biomass or protein at each visit. However, total cumulative lamina elongation, equivalent to the long term gain during the entire moult period, showed no significant difference between the three most intensive defoliation treatments, which were significantly greater than those of plants defoliated at 18 day intervals. Highest overall lamina protein levels were maintained at 6- and 9-day defoliation intervals. This suggests geese regrazed Puccinellia patches at a rate that maximised their number of harvests during the flightless period, but maintained highest protein levels and overall biomass in the sward. This suggests, in line with earlier studies, that moulting greylag geese combine dietary selection, reduced nitrogen excretion and regrazing patterns to meet protein demands during regrowth of flight feathers. [source] Integration of colour and textural information in multivariate image analysis: defect detection and classification issuesJOURNAL OF CHEMOMETRICS, Issue 1-2 2007J. M. Prats-Montalbán Abstract In industrial processes, the detection and visualisation of defects and the development of efficient automated classification tools are strategic issues, especially when dealing with random colour textures (RCTs). This paper discusses the benefits of integrating colour and spatial (i.e. textural) information of digital RGB colour images in multivariate image analysis (MIA) to deal with these topics. Regarding the first one, a simple and computational cost-effective monitoring procedure based on colour-textural MIA merged with multivariate statistical process control (MSPC) ideas is outlined. Two novel computed images: T2 and RSS Images are proposed. The procedure is applied on digital RGB colour images from artificial stone plates. With respect to the second issue, when colour-textural MIA is used for image classification a lot of factors (e.g. pre-processing, modelling,,,) likely affecting the success rate in the classification (SRC) show up. This paper presents a methodology based on the combination of experimental design and logistic regression for choosing the best combination of factors to maximise the SRC of different types of images. Digital RGB colour images from ceramic tiles and orange fruits are used to illustrate the potential of the proposed methodology. Copyright © 2007 John Wiley & Sons, Ltd. [source] Promoting the health of people with chronic obstructive pulmonary disease: patients' and carers' viewsJOURNAL OF CLINICAL NURSING, Issue 3-4 2010Ann Caress Aims and objectives., The aim of this study was to generate in-depth insights into patients' and family members' understanding of the causation, progression and prevention of chronic obstructive pulmonary disease and the role of health promotion with this population. In particular, we were interested in identifying the ways patients and family members considered that they could maximise their (patients') health, in the presence of this disease. Background., Chronic obstructive pulmonary disease is highly prevalent and a significant cause of morbidity and mortality, impacting on quality of life and healthcare expenditure. Health promotion is, therefore, an important consideration. There are few examples in the literature of health promotion programmes for this population, including those directed at smoking cessation, which also focus on the family or significant others. Design., An exploratory, descriptive design was employed. Method., Semi-structured, audio-recorded interviews were conducted with 14 patients and 12 family caregivers. Interviews were transcribed verbatim and thematically analysed using content analysis procedures which captured the meaning of the data. Results., The three main themes were ,health promotion: what's that?', ,community resources for health promotion' and ,it wasn't just the smoking'. Many participants seemed unaware that their health might benefit from a healthier life style and provided little spontaneous information on any activities they carried out to maintain or improve their health. Conclusions., This study highlighted a dearth of health promoting activity amongst people affected by chronic obstructive pulmonary disease. The reality for most patients was to manage the day-to-day demands that the symptoms of the disease imposed on them. Our data suggest that a more wide-ranging approach, encompassing aspects of health promotion, might be welcomed by many patients and their family carers. Relevance to clinical practice., The findings from this study highlight gaps in patients' and carers' understanding of the potential role of health promotion in chronic obstructive pulmonary disease and areas for intervention by health professionals. With the increase in smoking rates of women and predicted future increases in chronic obstructive pulmonary disease, it is imperative that health professionals find effective ways to provide support and health promotive care for patients and families. [source] An Economist's Perspective on Probability MatchingJOURNAL OF ECONOMIC SURVEYS, Issue 1 2000Nir Vulkan The experimental phenomenon known as ,probability matching' is often offered as evidence in support of adaptive learning models and against the idea that people maximise their expected utility. Recent interest in dynamic-based equilibrium theories means the term re-appears in Economics. However, there seems to be conflicting views on what is actually meant by the term and about the validity of the data. The purpose of this paper is therefore threefold: First, to introduce today's readers to what is meant by probability matching, and in particular to clarify which aspects of this phenomenon challenge the utility-maximisation hypothesis. Second, to familiarise the reader with the different theoretical approaches to behaviour in such circumstances, and to focus on the differences in predictions between these theories in light of recent advances. Third, to provide a comprehensive survey of repeated, binary choice experiments. [source] LIPOXYGENASE ACTIVITY IN PRICKLY PEAR FRUIT (OPUNTIA FICUS INDICA [L.] MILL.JOURNAL OF FOOD BIOCHEMISTRY, Issue 2 2010CACTACEAE) ABSTRACT Prickly pear LOX activity was detected in the membrane fractions of the fruit extracts at various stages of ripening. LOX specific activity was very low in the fruit of wild plants at the green stage (0.49 ± 0.04) and increased with fruit ripening, more than doubling in the ripened fruit (1.22 ± 0.06). Moreover, it was not influenced by the cultivar, whereas it was considerably increased (13.3 ± 1.4) by agronomic processes to which prickly pear plants are submitted to improve the organoleptic properties of fruits. The apparent molecular mass of the enzyme was estimated to be 96 kDa. The enzyme had an optimum pH value of 5.5 and a clear specificity for linolenic acid, which was oxidized at a rate one and a half times that of linoleic acid, under the same reaction conditions. The involvement of prickly pear LOX in the flavor biosynthesis of the fruit is supposed. PRACTICAL APPLICATIONS Over the last decade in particular, prickly pear fruits have been widely used as food, not only the whole fruit but also processed to make juices, jams and liquors popular the world over. Prickly pear production has therefore risen considerably and consequently both the labor force employed and revenues generated have increased. For those engaged in this sector it is therefore a prime objective to maximise the profile and thereby profitability of the fruit. It is here that our research into lipoxygenase activity can play a part, as it is known that this enzyme is responsible for the organoleptic properties of fruits and vegetables. The results are presented below. The relationship between lipoxygenase specific activity and specific agronomic processes utilized to improve the fruit quality is also addressed. [source] Migration and welfare: a very simple modelJOURNAL OF INTERNATIONAL DEVELOPMENT, Issue 7 2007Roberto Cellini Abstract The paper presents a very simple model of migration, relying on three widely accepted points: first, labour productivity and wages in a country depend on the present average human capital; second, agents maximise their utility, so that migration decisions depend on the wage gap across economies; third, the larger the personal human capital, the higher the propensity is to migrate (ceteris paribus). The model shows that migration through its external effects always lowers the welfare in the sending country, while the effects on the receiving country can be positive or negative. As a consequence, selfish developed economies could desire a larger migration than the optimal level for a benevolent World Planner. This calls for international coordination concerning the regulation of migration flows. Copyright © 2007 John Wiley & Sons, Ltd. [source] Effect of slice thickness on liver lesion detection and characterisation by multidetector CTJOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY, Issue 3 2010JT Smith Summary The purpose of our study was to compare the effectiveness of 3.2 mm, 5 mm and 7.5 mm slice thicknesses in the detection and characterisation of liver lesions found on CT in patients with known or suspected malignant disease. 110 patients underwent portal phase imaging using four-slice MDCT. Two blinded observers independently read hard copy images at each slice thickness. The size and location of each lesion detected was recorded by each observer on a diagram of liver segmental anatomy. Each lesion was characterised as benign, malignant or indeterminate in nature. A diagnostic confidence score was allocated for each lesion on a scale of 1,4. The pathology or behaviour of lesions was assessed using surgery with intra-operative ultrasound (IOUS) and histology, or interval imaging with MRI, CT, or sonography. 294 lesions were detected, 64 (22%) of which were malignant. Both observers detected significantly more lesions on the 3.2 mm versus 7.5 mm slice thickness (p < 0.0001). Both observers detected more malignant lesions on 3.2 mm and 5 mm slice thicknesses versus 7.5 mm. As slice thickness decreased there was a significant increase in the sensitivity of malignant lesion detection for observer 1 (p < 0.001) and borderline significance for observer 2 (p = 0.07). As slice thickness decreased the proportion of lesions characterised as indeterminate by both observers fell. With thinner slices, both detection and characterisation of liver lesions were improved. A slice thickness no greater than 5 mm should be used to maximise both detection and correct characterisation of liver lesions. [source] Identifying and implementing prevention programmes for childhood mental health problemsJOURNAL OF PAEDIATRICS AND CHILD HEALTH, Issue 12 2007Femke Giesen Abstract: A substantial number of children and adolescents in Australia have mental health problems. This review provides guidance to service providers for selecting prevention programmes designed to reduce mental health problems experienced by children. It addresses three issues. First, it highlights the importance of utilising programmes that focus on risk and protective factors which have a causal relationship with mental health problems. Second, it describes approaches that can be used to assess the quality of programme evaluations, and identifies common characteristics of more effective programmes. Finally, it identifies general factors which influence the uptake of innovations, such as new prevention programmes, in health services. These features include, for example, compatibility with potential providers' values, norms and perceived needs, and some flexibility which allows potential providers to adapt programmes to suit their specific needs and context. Addressing these general issues is important to maximise the uptake of effective new prevention programmes. [source] Seasonal patterns of sucrose concentration in relation to other quality parameters of sugar beet (Beta vulgaris L.)JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 1 2006Christine Kenter Abstract The chemical composition of sugar beet is the most important parameter affecting its processing. Sugar factories require beet with high concentrations of sucrose and low concentrations of melassigenic substances to maximise the amount of extractable sugar. In order to plan the processing campaign, forecasts of root and sugar yield by prediction models are possible but there are no means to predict the technical quality of the beet. In the present study, the seasonal development and physiological relationships of different parameters of sugar beet quality were analysed. In order to estimate possibilities for quality forecasts, the concentrations of beet quality variables in October were correlated with corresponding quality measurements in late summer and to weather variables during the growing season by linear regressions. In 2000 and 2001, 27 field trials were conducted on commercial farm fields in all sugar beet growing areas in Germany. From June to October, sequential samples were taken every 4 weeks and the concentrations of sucrose, potassium, sodium, total soluble nitrogen, ,-amino nitrogen, nitrate, betaine, reducing sugars and marc in the beet were determined. The sucrose concentration increased progressively until the final harvest date in autumn, whereas the concentrations of the melassigenic substances decreased markedly until late summer and remained fairly constant as the season progressed. Marc concentration was the most stable of the parameters analysed. The sucrose concentration was positively correlated with the concentrations of dry matter, betaine and marc, but negatively with nitrate concentration and leaf yield throughout the season. The correlation between the concentrations of sucrose and nitrogenous compounds measured in summer and their final concentrations in autumn was rather weak. However, it was close for potassium, sodium and marc and a satisfactory prediction of their final concentrations was possible by the end of August. Based on weather data, beet quality was not predictable. Therefore, it seems to be difficult to integrate beet quality parameters into prediction models. Copyright © 2005 Society of Chemical Industry [source] ,Can you take a student this morning?' Maximising effective teaching by practice nursesMEDICAL EDUCATION, Issue 5 2009Pat Smith Objectives, Little is known about the contribution nurses make to medical student learning. This study set out to explore the nature of practice nurse teaching during the general practice clerkship and to investigate ways in which the teacher and learner (the practice nurse and the medical student) can be best supported to maximise learning. Methods, Mixed focus groups were conducted with general practitioner educational supervisors and practice nurses. Further focus groups were conducted with students on completion of clerkships. Results, There is wide variation in the delivery, organisation and expectations of practice nurse teaching. Although there is some evidence of a passive learning experience, the learning dynamic and the student,nurse relationship are regarded highly. Conclusions, Time spent with practice nurses is an important part of the clerkship in general practice. The nature of the practice nurse,medical student relationship differs from that of the educational supervisor,medical student relationship and can be built upon to maximise learning during the clerkship. The experience for the practice nurse, medical student and supervisor can be enhanced through formal preparation for delivering teaching. [source] Gap-crossing movements predict species occupancy in Amazonian forest fragmentsOIKOS, Issue 2 2009Alexander C. Lees In fragmented landscapes, species persistence within isolated habitat patches is governed by a myriad of species life-history, habitat patch and landscape characteristics. We investigated the inter-specific variation in non-forest gap-crossing abilities of an entire tropical forest-dependent avifauna. We then related this measure of dispersal ability to species life-history characteristics and occupancy data from 31 variable-sized forest patches sampled within the same fragmented forest landscape. A total of 5436 gap-crossing movements of 231 forest-dependent bird species were observed across ten linear forest gaps of varying widths, adjacent to large areas of undisturbed forest. Species persistence in isolated fragments was strongly linked to gap-crossing ability. The most capable gap-crossers were medium to large-bodied species in the large insectivore, frugivore and granivore guilds, matching the most prevalent subset of species in small forest patches. However, some competent gap-crossing species failed to occur in small patches, and minimum forest-patch area requirements were more important in determining patch occupancy for these species. Narrow forest gaps (4,70 m) created by roads and power-lines may become territory boundaries, thereby eliminating home-range gap-crossing movements for many forest species, but permit rarer dispersal events. Wider gaps (>70 m) may inhibit gap-crossing behaviour for all but the most vagile species. Although patch size and quality may be the most important factors in structuring species assemblages in forest fragments, our results show that the degree of patch isolation and permeability of the surrounding matrix also explain which species can persist in forest isolates. Reducing the number and width of forest-dividing gaps; maintaining and/or creating forest corridors and increasing matrix permeability through the creation and maintenance of ,stepping-stone' structures will maximise the species retention in fragmented tropical forest landscapes. [source] | |||||||||||||||||||||||||||||||