377 research outputs found
The contribution of cause-effect link to representing the core of scientific paperâThe role of Semantic Link Network
The Semantic Link Network is a general semantic model for modeling the structure and the evolution of complex systems. Various semantic links play different roles in rendering the semantics of complex system. One of the basic semantic links represents cause-effect relation, which plays an important role in representation and understanding. This paper verifies the role of the Semantic Link Network in representing the core of text by investigating the contribution of cause-effect link to representing the core of scientific papers. Research carries out with the following steps: (1) Two propositions on the contribution of cause-effect link in rendering the core of paper are proposed and verified through a statistical survey, which shows that the sentences on cause-effect links cover about 65% of key words within each paper on average. (2) An algorithm based on syntactic patterns is designed for automatically extracting cause-effect link from scientific papers, which recalls about 70% of manually annotated cause-effect links on average, indicating that the result adapts to the scale of data sets. (3) The effects of cause-effect link on four schemes of incorporating cause-effect link into the existing instances of the Semantic Link Network for enhancing the summarization of scientific papers are investigated. The experiments show that the quality of the summaries is significantly improved, which verifies the role of semantic links. The significance of this research lies in two aspects: (1) it verifies that the Semantic Link Network connects the important concepts to render the core of text; and, (2) it provides an evidence for realizing content services such as summarization, recommendation and question answering based on the Semantic Link Network, and it can inspire relevant research on content computing
An adaptable and personalised e-learning system based on free web resources
A personalised and adaptive E-Learning system architecture
is developed to provide a comprehensive learning environment for learners who cannot follow a conventional programme of study. The system extracts information from freely available resources on the Web, and taking into consideration the learners' background and requirements to design modules and a planner system to facilitate the learning process. The
process is supported by the development of an ontology to optimise the in-formation extraction process. An application in the computer science field is used to evaluate the proposed system based on the IEEE/ACM Computing curriculum
A Semantic Grid Oriented to E-Tourism
With increasing complexity of tourism business models and tasks, there is a
clear need of the next generation e-Tourism infrastructure to support flexible
automation, integration, computation, storage, and collaboration. Currently
several enabling technologies such as semantic Web, Web service, agent and grid
computing have been applied in the different e-Tourism applications, however
there is no a unified framework to be able to integrate all of them. So this
paper presents a promising e-Tourism framework based on emerging semantic grid,
in which a number of key design issues are discussed including architecture,
ontologies structure, semantic reconciliation, service and resource discovery,
role based authorization and intelligent agent. The paper finally provides the
implementation of the framework.Comment: 12 PAGES, 7 Figure
Binary Neutron-Star Systems: From the Newtonian Regime to the Last Stable Orbit
We report on the first calculations of fully relativistic binary circular
orbits to span a range of separation distances from the innermost stable
circular orbit (ISCO), deeply inside the strong field regime, to a distance
( 200 km) where the system is accurately described by Newtonian dynamics.
We consider a binary system composed of two identical corotating neutron stars,
with 1.43 gravitational mass each in isolation. Using a conformally
flat spatial metric we find solutions to the initial value equations that
correspond to semi-stable circular orbits. At large distance, our numerical
results agree exceedingly well with the Newtonian limit. We also present a self
consistent determination of the ISCO for different stellar masses.Comment: 4 pages, 3 postscript figures. Data points added to fig 2; some
issues clarified; references adde
Functionalized Copper Nanoparticles with Gold Nanoclusters: Part I. Highly Selective Electrosynthesis of Hydrogen Peroxide
© 2023 The Authors. Published by American Chemical Society. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/Copper nanoparticles (CuNPs) and gold nanoclusters (AuNCs) show a high catalytic performance in generating hydrogen peroxide (H2O2), a property that can be exploited to kill disease-causing microbes and to carry carbon-free energy. Some combinations of NPs/NCs can generate synergistic effects to produce stronger antiseptics, such as H2O2 or other reactive oxygen species (ROS). Herein, we demonstrate a novel facile AuNC surface decoration method on the surfaces of CuNPs using galvanic displacement. The CuâAu bimetallic NPs presented a high selective production of H2O2 via a two-electron (2eâ) oxygen reduction reaction (ORR). Their physicochemical analyses were conducted by scanning electron microscopy (SEM), transmitting electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). With the optimized CuâAu1.5NPs showing their particle sizes averaged in 53.8 nm, their electrochemical analysis indicated that the pristine AuNC structure exhibited the highest 2eâ selectivity in ORR, the CuNPs presented the weakest 2eâ selectivity, and the optimized CuâAu1.5NPs exhibited a high 2eâ selectivity of 95% for H2O2 production, along with excellent catalytic activity and durability. The optimized CuâAu1.5NPs demonstrated a novel pathway to balance the cost and catalytic performance through the appropriate combination of metal NPs/NCs.Peer reviewe
Gravitational radiation from corotating binary neutron stars of incompressible fluid in the first post-Newtonian approximation of general relativity
We analytically study gravitational radiation from corotating binary neutron
stars composed of incompressible, homogeneous fluid in circular orbits. The
energy and the angular momentum loss rates are derived up to the first
post-Newtonian (1PN) order beyond the quadrupole approximation including
effects of the finite size of each star of binary. It is found that the leading
term of finite size effects in the 1PN order is only smaller than that in the Newtonian order, where means the ratio of the gravitational radius to the mean radius of
each star of binary, and the 1PN term acts to decrease the Newtonian finite
size effect in gravitational radiation.Comment: 26 pages, revtex, 9 figures(eps), accepted for publication in Phys.
Rev.
COALESCING NEUTRON STARS AS GAMMA RAY BURSTERS ?
We investigate the dynamics and evolution of coalescing neutron stars. The
three-dimensional Newtonian equations of hydrodynamics are integrated by the
`Piecewise Parabolic Method' However, we do include the effects of the emission
of gravitational waves on the hydrodynamics. The properties of neutron star
matter are described by the equation of state of Lattimer & Swesty. In addition
to the fundamental hydrodynamic quantities, density, momentum, and energy, we
follow the time evolution of the electron density in the stellar gas. Energy
losses and changes of the electron abundance due to the emission of neutrinos
are taken into account by an elaborate ``neutrino leakage scheme'', which
employs a careful calculation of the lepton number and energy source terms of
all neutrino types. The grid is Cartesian and equidistant with a resolution of
64**3 or 128**3, which allows us to calculate the self-gravity via fast Fourier
transforms.Comment: extended abstract contribution to the proceedings of the 17th Texas
Symposium, 2 pages, uuencoded compressed postscript
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Evaluation of bus networks in China: From topology and transfer perspectives
With the development of the public transportation, bus network becomes complicated and hard to evaluate. Transfer time is a vital indicator to evaluate bus network. This paper proposed a method to calculate transfer times using Space P. Four bus networks in China have been studied in this paper. Some static properties based on graph theory and complex theory are used to evaluate bus topological structure. Moreover, a bus network evolution model to reduce transfer time is proposed by adding lines. The adding method includes four types among nodes with random choice, large transfer time, degree, and small degree. The results show that adding lines with nodes of small degree is most effective comparing with the other three types.Peer Reviewe
What Makes Theatrical Performances Successful in China's Tourism Industry?
This study aims to explore the factors affecting the success of a popular tourist product, namely, theatrical performance, within the context of China's tourism industry and develop a model based on previously successful productions. Using qualitative software, 22 Chinese-language articles on theatrical performances are analyzed to generate a list of success factors, classified as internal and external. The internal factors are storyline and performing, market positioning and marketing strategy, investment and financial support, operation and management, performing team, outdoor venue, indoor/outdoor stage supporting facilities, continuous improvement, and production team. The external factors are collaboration between cultural industries and local tourism, government support, privatization, and social and cultural effect. This study also provides suggestions for the future development of theatrical performances in China
Gravitational Radiation from Rotational Instabilities in Compact Stellar Cores with Stiff Equations of State
We carry out 3-D numerical simulations of the dynamical instability in
rapidly rotating stars initially modeled as polytropes with n = 1.5, 1.0, and
0.5. The calculations are done with a SPH code using Newtonian gravity, and the
gravitational radiation is calculated in the quadrupole limit. All models
develop the global m=2 bar mode, with mass and angular momentum being shed from
the ends of the bar in two trailing spiral arms. The models then undergo
successive episodes of core recontraction and spiral arm ejection, with the
number of these episodes increasing as n decreases: this results in
longer-lived gravitational wave signals for stiffer models. This instability
may operate in a stellar core that has expended its nuclear fuel and is
prevented from further collapse due to centrifugal forces. The actual values of
the gravitational radiation amplitudes and frequencies depend sensitively on
the radius of the star R_{eq} at which the instability develops.Comment: 39 pages, uses Latex 2.09. To be published in the Dec. 15, 1996 issue
of Physical Review D. 21 figures (bitmapped). Originals available in
compressed Postscript format at ftp://zonker.drexel.edu/papers/bars
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