A dressing method for soliton solutions of the Camassa-Holm equation

The soliton solutions of the Camassa-Holm equation are derived by the implementation of the dressing method. The form of the one and two soliton solutions coincides with the form obtained by other methods.Comment: 18 pages, 2 figure

Technical Assistance to UXO Clearance Operations in Savannakhet Province, Lao PDR

The needs of the communities vary depending on their location. The communities close to the main access routes have few needs in relation to UXO action as they have access to most services already and many have already received UXO clearance support. The communities in the inaccessible areas need safe land to grow food, but in many cases access is required to permit UXO clearance and other development activities to take place. For these areas UXO clearance in support of access is most important with clearance for agriculture required once access is achieved. UXO clearance to reduce accidents are not a priority as the communities are accustomed to living with UXO

A Dressing Method for Soliton Solutions of the Camass-Holm Equation

The soliton solutions of the Camassa-Holm equation are derived by the implementation of the dressing method. The form of the one and two soliton solutions coincides with the form obtained by other methods

Camassa-Holm cuspons, solitons and their interactions via the dressing method

A dressing method is applied to a matrix Lax pair for the Camassa-Holm equation, thereby allowing for the construction of several global solutions of the system. In particular solutions of system of soliton and cuspon type are constructed explicitly. The interactions between soliton and cuspon solutions of the system are investigated. The geometric aspects of the Camassa-Holm equation ar re-examined in terms of quantities which can be explicitly constructed via the inverse scattering method.Comment: 35 pages, 10 figures. arXiv admin note: text overlap with arXiv:1702.0112

Heavy-ion reaction studies of nuclei far from stability

Heavy-ion multi-nucleon transfer reactions have been used to investigate a number of nuclei far from stability in the mass range A= 20 to 39. Measurements of the masses and excited states have been made for the nuclei 20N, 22.23F, 35,36,37P and 39Sc. The 39Sc mass determination is the first reported measurement and indicates that the nucleus is unbound to ground state proton emission by 580±30 keV. The first information on the level schemes of 23F, 37P and 39Sc has also been forthcoming, whiie a substantial amount of new data has been obtained for the other nuclei investigated. The probable structure of many of the new and previously reported levels observed in the present work are. deduced through comparison with shell model and DWBA calculations and by analogy with similar reactions. Where comparison is possible, the results presented here are in general in good agreement with those obtained by earlier studies. The mass evaluations for 20N and 37P are, however, notable exceptions. There is evidence that 37p may be ~0.7 MeV more bound than previously accepted, although further work will be required to confirm this. In contrast, 20N appears to be ~1 MeV less bound than previous determinations suggest. A possible explanation for this discrepancy is advanced. A number of techniques have been developed in the course of the work described here to aid in the detection of very low yield reaction products. These comprise a system to measure the time-of-flight of ions around a magnetic spectrograph, a normal incidence focal plane detector and a system for the production of very pure isotopic targets via ion implantation. Descriptions of these systems and associated techniques are presented

Blinded by gold:Toronto sports community ignores negative legacies of 2015 Pan Am Games

Event organizers and city officials often justify the high costs of hosting an event by highlighting its legacies. Legacies are a topic of contentious discourse among event researchers, over definition, measurement, and significance. The bid for the Toronto 2015 Pan Am Games highlighted sport legacies as a priority. Thirteen semistructured qualitative interviews were conducted with organizers, city officials, and members of the Toronto sports community. These interviews were analyzed using a thematic coding method. The degree of familiarity with "event legacies" among respondents varied, as did the definitions they offered. Multiple positive legacies were highlighted, most frequently: new or improved sports facilities and equipment (11/13 respondents), increased awareness of sport and sport opportunities (9/13), and inspiration factor (7/13). No respondent named negative legacies. Two major themes emerged: 1) there is no universal understanding of legacies as a term or concept; and 2) organizers are biased when asked about legacies, favoring the positive, and ignoring the negative.</jats:p

Cascade of Complexity in Evolving Predator-Prey Dynamics

We simulate an individual-based model that represents both the phenotype and genome of digital organisms with predator-prey interactions. We show how open-ended growth of complexity arises from the invariance of genetic evolution operators with respect to changes in the complexity, and that the dynamics which emerges is controlled by a non-equilibrium critical point. The mechanism is analogous to the development of the cascade in fluid turbulence.Comment: 5 pages, 3 figures; added comments on system size scaling and turbulence analogy, added error estimates of data collapse parameters. Slightly enhanced from the version which will appear in PR

Mark report satellite tags (mrPATs) to detail large-scale horizontal movements of deep water species: First results for the Greenland shark (Somniosus microcephalus)

The deep-sea is increasingly viewed as a lucrative environment for the growth of resource extraction industries. To date, our ability to study deep-sea species lags behind that of those inhabiting the photic zone limiting scientific data available for management. In particular, knowledge of horizontal movements is restricted to two locations; capture and recapture, with no temporal information on absolute animal locations between endpoints. To elucidate the horizontal movements of a large deep-sea fish, a novel tagging approach was adopted using the smallest available prototype satellite tag – the mark-report satellite tag (mrPAT). Five Greenland sharks (Somniosus microcephalus) were equipped with multiple mrPATs as well as an archival satellite tag (miniPAT) that were programmed to release in sequence at 8–10 day intervals. The performance of the mrPATs was quantified. The tagging approach provided multiple locations per individual and revealed a previously unknown directed migration of Greenland sharks from the Canadian high Arctic to Northwest Greenland. All tags reported locations, however the accuracy and time from expected release were variable among tags (average time to an accurate location from expected release = 30.8 h, range: 4.9 – 227.6 h). Average mrPAT drift rate estimated from best quality messages (LQ1,2,3) was 0.37 ± 0.09 m/s indicating tags were on average 41.1 ± 63.4 km (range: 6.5–303.1 km from the location of the animal when they transmitted. mrPATs provided daily temperature values that were highly correlated among tags and with the miniPAT (70.8% of tag pairs were significant). In contrast, daily tilt sensor data were variable among tags on the same animal (12.5% of tag pairs were significant). Tracking large-scale movements of deep-sea fish has historically been limited by the remote environment they inhabit. The current study provides a new approach to document reliable coarse scale horizontal movements to understand migrations, stock structure and habitat use of large species. Opportunities to apply mrPATs to understand the movements of medium size fish, marine mammals and to validate retrospective movement modelling approaches based on archival data are presented

Offshore renewables - social impact : two way conversation with the people of Scotland

Findings from a piece of participatory research into the social impacts of offshore wind farms (OWFS) in Scotland. It describes innovative methods used to develop a conceptual framework, based on social values, that enables a better understanding of the social impacts of OWFs

A New Threat to Honey Bees, the Parasitic Phorid Fly Apocephalus borealis

Honey bee colonies are subject to numerous pathogens and parasites. Interaction among multiple pathogens and parasites is the proposed cause for Colony Collapse Disorder (CCD), a syndrome characterized by worker bees abandoning their hive. Here we provide the first documentation that the phorid fly Apocephalus borealis, previously known to parasitize bumble bees, also infects and eventually kills honey bees and may pose an emerging threat to North American apiculture. Parasitized honey bees show hive abandonment behavior, leaving their hives at night and dying shortly thereafter. On average, seven days later up to 13 phorid larvae emerge from each dead bee and pupate away from the bee. Using DNA barcoding, we confirmed that phorids that emerged from honey bees and bumble bees were the same species. Microarray analyses of honey bees from infected hives revealed that these bees are often infected with deformed wing virus and Nosema ceranae. Larvae and adult phorids also tested positive for these pathogens, implicating the fly as a potential vector or reservoir of these honey bee pathogens. Phorid parasitism may affect hive viability since 77% of sites sampled in the San Francisco Bay Area were infected by the fly and microarray analyses detected phorids in commercial hives in South Dakota and California's Central Valley. Understanding details of phorid infection may shed light on similar hive abandonment behaviors seen in CCD