809 research outputs found

    Microcomputer Algorithms for Prime Number Testing

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    This paper gives a survey of different methods of prime number testing. Emphasis has been given to algorithms based upon Fermat\u27s Theorem: if p is an odd prime number, then p divides ap-a. All of the computer programs described in this paper have been written for use on microcomputers and so the feasibility of using microcomputers is also discussed. Finally, numbers of various forms have been considered for primality with special attention given to Mersenne and Fermat numbers. It is hoped that some of the information contained in this paper may provide worthwhile enrichment ideas for mathematics educators

    Cleaved end-face quality of microstructured polymer optical fibres

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    The cutting of a microstructured polymer optical fibre to form an optical end-face is studied. The effect of the temperature and speed of the cutting blade on the end-face is qualitatively assessed and it is found that for fibres at temperatures in the range 70–90 C, a blade at a similar temperature moving at a speed of less than 0.5 mm/s produces a good quality end-face. The nature of the damage caused by the cutting process was examined and found to vary with fibre temperature, blade quality and cut depth. Thermo-mechanical analysis showed that the drawn material was significantly more visco-elastic than the annealed raw material in the 70-90 C temperature range. The behaviour of the surface damage with cut depth was found to be consistent with the behaviour of a visco-elastic material

    When Personal Dreams Derail: Rural Cameroonian Women Aspire For Their Children

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    Data gathered from a convenience sample of 36 women who reside in rural villages lying on the outskirts of Buea, Cameroon is not consistent with the “culture of poverty” proposition which states that personal characteristics of the poor tie them to a life of poverty. These findings run counter to an assumed “culture of poverty” in which persons do not hold career aspirations and socialize their children with attitudes that assure the generational transmission of poverty. Respondents, as a case vignette illustrates, conveyed that besides marriage they had wanted a career in order to achieve a living wage. After their own career dreams were dashed, they devoted themselves to the hard work of farming and petty trading in the hope they could help their children escape subsistence living. Results of this study point away from policies that would seek to change the outlook and habits of mothers living in poverty and toward external changes that would permit them earnings commensurate with their persistent efforts

    Master Gardener Satisfaction and Intent to Remain After Training via Remote Delivery

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    One year after using remote delivery via video web conferencing (VWC) in training, we surveyed Delaware master gardeners to assess the remote delivery trainees\u27 satisfaction and intent to remain as compared to those characteristics in volunteers who had had face-to-face training. Although the remote delivery trainees were satisfied overall, they were significantly less satisfied than those who had participated in face-to-face trainings. A more positive perception of the VWC experience was associated with master gardeners\u27 increased satisfaction, suggesting the importance of VWC quality. However, volunteers trained via VWC did not report more or less of an intention to remain with the organization

    Tipping the scales: ambidexterity practices on e-HRM projects

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    Purpose: We examine and conceptualise the ways in which a balance can be achieved between optimising the efficiency and effectiveness of electronic HRM (e-HRM) systems for human resource management (HRM) and enabling innovation to occur during the system implementation. Design/methodology/approach: An intepretive case study of a UK local authority e-HRM system implementation is examined using the notion of ambidexterity as an analytical device. Ambidexterity relates to how an organisation develops the ability to operate efficiently in the now, while at the same time being able to adapt to environmental changes around and ahead of them in order to grow into the future. Findings: As an intra-organisational capability, ambidexterity is found to derive from the simultaneous interplay and balancing of dual capabilities: exploitation and exploration.. E-HRM exploitation concerned the capability to generate new knowledge with innovatory effects, created through the everyday practices performed by practitioners at all levels in the organisation. E-HRM exploration, rather than being a purposeful act, was found to be an accidental consequence of engaging in exploitation to maintain the status quo. Originality/value: There is a lack of detailed investigation of how organisations actually achieve ambidexterity, particularly in three under-researched areas: ambidexterity in the public sector, at HR functional level and e-HRM systems implementation. Bundling these three areas into an integrated examination allows us to both identify how exploitation and exploration play out in the ambidextrous practices of an e-HRM project and also to identify the dimensions of ambidexterity in balancing e-HRM work

    Reconstruction of haplotype-blocks selected during experimental evolution.

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    The genetic analysis of experimentally evolving populations typically relies on short reads from pooled individuals (Pool-Seq). While this method provides reliable allele frequency estimates, the underlying haplotype structure remains poorly characterized. With small population sizes and adaptive variants that start from low frequencies, the interpretation of selection signatures in most Evolve and Resequencing studies remains challenging. To facilitate the characterization of selection targets, we propose a new approach that reconstructs selected haplotypes from replicated time series, using Pool-Seq data. We identify selected haplotypes through the correlated frequencies of alleles carried by them. Computer simulations indicate that selected haplotype-blocks of several Mb can be reconstructed with high confidence and low error rates, even when allele frequencies change only by 20% across three replicates. Applying this method to real data from D. melanogaster populations adapting to a hot environment, we identify a selected haplotype-block of 6.93 Mb. We confirm the presence of this haplotype-block in evolved populations by experimental haplotyping, demonstrating the power and accuracy of our haplotype reconstruction from Pool-Seq data. We propose that the combination of allele frequency estimates with haplotype information will provide the key to understanding the dynamics of adaptive alleles

    Why we're all going on a summer holiday : the role of the working-class organisations in the development of popular tourism, 1850-1950

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    Includes bibliographical referencesAvailable from British Library Document Supply Centre- DSC:DX221347 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

    Laparoscopic hysterectomy with or without pelvic lymphadenectomy or sampling in a high-risk series of patients with endometrial cancer

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    BACKGROUND: The purpose of the study was to determine the outcome of all patients with endometrial adenocarcinoma cancer treated by laparoscopic hysterectomy at our institution, many of whom were high-risk for surgery. METHODS: Data was collected by a retrospective search of the case notes and Electronic Patient Records of the thirty eight patients who underwent laparoscopic hysterectomy for endometrial cancer at our institutions. RESULTS: The median body mass index was 30 (range 19–67). Comorbidities were present in 76% (29 patients); 40% (15 patients) had a single comorbid condition, whilst 18% (7 patients) had two, and a further 18% (7 patients) had more than two. Lymphadenectomy was performed in 45% (17 patients), and lymph node sampling in 21% (8 patients). Median operating time was 210 minutes (range 70–360 minutes). Median estimated blood loss was 200 ml (range 50–1000 ml). There were no intraoperative complications. Post-operative complications were seen in 21% (2 major, 6 minor). Blood transfusion was required in 5% (2 patients). The median stay was 4 post-operative nights (range 1–25 nights). In those patients undergoing lymphadenectomy, the mean number of nodes taken was fifteen (range 8–26 nodes). The pathological staging was FIGO stage I 76% (29 patients), stage II 8% (3 patients), stage III 16% (6 patients). The pathological grade was G1 31% (16 patients), G2 45% (17 patients), G3 24% (8 patients). CONCLUSION: Laparoscopic hysterectomy can be safely carried out in patients at high risk for surgery, with no compromise in terms of outcomes, whilst providing all the benefits inherent in minimal access surgery

    Extentions of Orderings of Higher Level on Rings

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