7,929 research outputs found
Exploring the role of Facebook in re-shaping backpacker’s social interactions
The recent Facebook launch of Timeline, Social Graph Search, and the increased use of the mobile Facebook apps has resulted in some important implications for the use of Facebook by backpackers. The purpose of this paper is to (re) explore how Facebook has impacted social relationships between backpackers and their personal, professional, and ‘fellow traveller’ networks, particularly in-light of these recent changes to Facebook and the increased reduction of anonymity while travelling. An exploratory survey was administered to 216 backpackers through social media. Descriptive analysis was conducted to explore the perceived social risks and benefits of Facebook in the context of the backpacking experience
Marginal states of the resistive tearing mode with flow in cylindrical geometry
The linear stability of tearing modes in a cylindrical plasma subject to a sub-Alfvénic equilibrium shear flow along the equilibrium magnetic field is considered. The equations in the resistive boundary layer at the rational surface are solved numerically using a Fourier transform combined with a finite-element approach. The behaviour of the growth rate as a function of the flow and the various parameters (including a perpendicular fluid viscosity) is obtained. Marginal stability curves showing the dependence of the familiar matching parameter Δ' with flow and shear are also given
Nonlocal compensation of pure phase objects with entangled photons
We suggest and demonstrate a scheme for coherent nonlocal compensation of
pure phase objects based on two-photon polarization and momentum entangled
states. The insertion of a single phase object on one of the beams reduces the
purity of the state and the amount of shared entanglement, whereas the original
entanglement can be retrieved by adding a suitable phase object on the other
beam. In our setup polarization and momentum entangled states are generated by
spontaneous parametric downconversion and then purified using a programmable
spatial light modulator, which may be also used to impose arbitrary space
dependent phase functions to the beams. As a possible application, we suggest
and demonstrate a quantum key distribution protocol based on nonlocal phase
compensation.Comment: 7 pages, 5 figure
Phase transitions related to the pigeonhole principle
Since Paris introduced them in the late seventies (Paris1978), densities turned out to be useful for studying independence results. Motivated by their simplicity and surprising strength we investigate the combinatorial complexity of two such densities which are strongly related to the pigeonhole principle. The aim is to miniaturise Ramsey's Theorem for -tuples. The first principle uses an unlimited amount of colours, whereas the second has a fixed number of two colours. We show that these principles give rise to Ackermannian growth. After parameterising these statements with respect to a function f:N->N, we investigate for which functions f Ackermannian growth is still preserved
Probing neutrino physics with a self-consistent treatment of the weak decoupling, nucleosynthesis, and photon decoupling epochs
We show that a self-consistent and coupled treatment of the weak decoupling,
big bang nucleosynthesis, and photon decoupling epochs can be used to provide
new insights and constraints on neutrino sector physics from high-precision
measurements of light element abundances and cosmic microwave background
observables. Implications of beyond-standard-model physics in cosmology,
especially within the neutrino sector, are assessed by comparing predictions
against five observables: the baryon energy density, helium abundance,
deuterium abundance, effective number of neutrinos, and sum of the light
neutrino mass eigenstates. We give examples for constraints on dark radiation,
neutrino rest mass, lepton numbers, and scenarios for light and heavy sterile
neutrinos.Comment: 29 pages, 10 figure
Exploring the influence of Facebook on backpacker's social experience in hostels
The primary purpose of this study was to explore the relationship between Facebook usage and the corresponding impact on travel relationships within the hostel and backpacker community. An online survey was administered to backpackers which were both hostel and Facebook users by way of travel-centric online communities. The impact of Facebook on backpacker behaviors, decision making, and relationships was examined. Analysis indicates that Facebook is shaping the evolution of social, behavioral, and communicative norms within the backpacker hostel environment and that there is still a gap in the research that examines the impact of social networking websites on the hostel experience
Book Review: In the Presence of Butterflies: The Story of the Original Butterfly Project
Review of the book In the Presence of Butterflies: The Story of the Original Butterfly Project, by Arielle A Aaron. Bloomington, IN: AuthorHouse, 2011
Book Review: Kentucky Hauntings: Homespun Ghost Stories & Unexplained History
Review of the book Kentucky Hauntings: Homespun Ghost Stories & Unexplained History. Brown, Roberta Simpson & Lonnie E. Brown. Lexington, KY: University Press of Kentucky, 2013. ISBN 978-0-8131-4320-0
English Ethnicity and Culture in North America
English Ethnicity and Culture in North America. David T. Gleeson, ed. Columbia: The University of South Carolina Press, 2017. ISBN: 978-1-61117-786-2 (Hardback); ISBN: 978-1-61117-787-9 (ebook). $49.99. 240 p
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