537 research outputs found

    Is colony attendance by shearwaters influenced by bright moonlight or inclement weather?

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    If nocturnal colony attendance is associated with avoidance of predators, fewer nests would be visited by parent shearwaters on moonlit nights, or nests would be visited later, than on dark nights. Additionally, if shearwaters foraged at night on certain prey species, feeds delivered to nestlings would be larger on dark nights. We found that feed size and the probability of a nest visit were both greater on moonlit nights, while food delivery after midnight was not. A minimal risk of predation concurs with the disregard for moonlight shown by Flesh-footed Shearwaters, Puffinus carneipes, but does not explain their apparent preference for it. While nocturnal foraging is unlikely, it is not clear why feeds were significantly larger on moonlit nights, or why colony attendance by this species is strictly nocturnal. Weather may impact the ability of seabirds to forage at sea, although this is difficult to confirm. It was likely that nest attendance by parent shearwaters would be lower if certain variables negatively influenced foraging, but such influences may not manifest themselves immediately. Nest visits were examined in relation to local weather conditions at time-lag intervals of up to seven days. While no significant cross correlations were determined between burrow entry and two wind-velocity variables, a significant positive correlation was determined when the study site experienced pronounced unseasonal rainfall events

    Robust low loss splicing of hollow core photonic bandgap fiber to itself

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    Robust, low loss (0.16dB) splicing of hollow core photonic band gap fiber to itself is presented. Modal content is negligibly affected by splicing, enabling penalty-free 40Gbit/s data transmission over > 200m of spliced PBGF

    30.7 Tb/s (96x320 Gb/s) DP-32QAM transmission over 19-cell photonic band gap fiber

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    We report for the first time coherently-detected, polarization-multiplexed transmission over a photonic band gap fiber. By transmitting 96 x 320-Gb/s DP-32QAM modulated channels, a net data rate of 24 Tb/s was obtained

    Hollow core fibres for high capacity data transmission

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    We review our progress in developing, characterizing and handling hollow-core photonic bandgap fibers with improved transmission properties, targeted at high-capacity, low-latency data transmission in the current telecoms window and at the potentially lower-loss 2µm wavelengths

    Exploring the Potential of Social Marketing to Encourage Sustainable Tourist Behaviour in South West England

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    In the South West of England tourism provides an extremely important form of economic revenue, with 92 million nights spent in the region, generating over £9 billion in visitor spending and 11% of the total workforce employed either directly or indirectly in the sector. However this additional seasonal influx of visitors inevitably places a strain on the natural environment, built resources, infrastructure and communities. In order to readdress the balance tourism as a sector needs to be more sustainable and the emphasis for change is now placed on the individual. Social marketing has been used successfully to encourage behaviour change in the health sector, and is beginning to be recognised for its potential in encouraging sustainable behaviour, but has never been specifically applied in a tourism context. Therefore this research evaluates the potential of applying a social marketing methodology to encourage sustainable behaviour amongst tourists in two case study areas in South West England. Social marketing focusses on changing behaviour by understanding individual perceptions of the barriers to and motivations for behaviour. A social methodology then works to segment individuals into groups that share similar attitudes and beliefs, those groups identified as most likely to respond, are targeted with an intervention to encourage behaviour change. This research identified the perceived and actual barriers to (cost, time, convenience), and motivations for sustainable tourist behaviour among participants from the case study areas and identified three distinct clusters of tourists, one of which was identified as suitable for targeting with a social marketing intervention. This research also revealed that even those most committed to range of sustainable behaviours in the home environment do not continue this behaviour when in the holiday environment. A further dimension was added to this research by exploring the use of an ecological footprint calculator (REAP for Tourism) to quantify the environmental impact of individual tourists and to explore whether pro-environmental attitudes and behaviour equate to lower environmental impact

    FRICTIONLESS ONBOARDING FOR END-TO-END ENCRYPTED COLLABORATIVE SYSTEMS

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    Many current systems require a user account to access system features or allow a guest mode to skip account creation. In collaboration software that includes a guest mode, there are two features that are currently supported: (1) Joining a meeting via a guest mode, and (2) Guest mode for an entire application using an anonymous token, which is a token for a particular session only and needs another guest session on re-entry; the guest session is not persisted on retry. As a result, it is critical to solve the problem of onboarding allowing users to enter the system easily in a Try Now or Guest Mode that provides a full-feature rich experience that a user would get if the user had signed-up for an account. The problem is even more challenging for collaboration software that utilizes end-to-end encryption. This proposal provides techniques to leverage the existing Open Authorization (OAuth) flow by deferring email verification and password creation to reduce the time involved to join a guest session in an end-to-end collaborative system. By utilizing techniques of this proposal, a persistent guest session can be facilitated on a given client device and a clear path can be provided to upgrade to a full free and/or paid account
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