10,291 research outputs found
Satellite Broadcasting Enabled Blockchain Protocol: A Preliminary Study
Low throughput has been the biggest obstacle of large-scale blockchain
applications. During the past few years, researchers have proposed various
schemes to improve the systems' throughput. However, due to the inherent
inefficiency and defects of the Internet, especially in data broadcasting
tasks, these efforts all rendered unsatisfactory. In this paper, we propose a
novel blockchain protocol which utilizes the satellite broadcasting network
instead of the traditional Internet for data broadcasting and consensus tasks.
An automatic resumption mechanism is also proposed to solve the unique
communication problems of satellite broadcasting. Simulation results show that
the proposed algorithm has a lower communication cost and can greatly improve
the throughput of the blockchain system. Theoretical estimation of a satellite
broadcasting enabled blockchain system's throughput is 6,000,000 TPS with a 20
gbps satellite bandwidth.Comment: Accepted by 2020 Information Communication Technologies Conference
(ICTC 2020
First order corrections to black hole thermodynamics: a simple approach enhanced
Perturbation theory plays an essential role in the realm of physics,
especially when it is difficult or impossible to obtain exact solutions.
Incorporating higher derivative terms into the gravitational action leads to an
important perturbation problem. In this paper, we demonstrate that the first
order corrections to black hole thermodynamics, caused by any higher derivative
terms, can be achieved without explicitly solving the modified metric. This
enhances a simple approach discovered two decades ago and resolves the
controversy surrounding it. Astonishingly, we observe that the perturbation
theory of quantum mechanics also exhibits a similar behavior, which reveals the
existence of a universal theoretical structure underlying the perturbation
theories of black hole thermodynamics, quantum mechanics and even other
disciplines.Comment: 6 pages, no figure
Warped Brane worlds in Critical Gravity
We investigate the brane models in arbitrary dimensional critical gravity
presented in [Phys. Rev. Lett. 106, 181302 (2011)]. For the model of the thin
branes with codimension one, the Gibbons-Hawking surface term and the junction
conditions are derived, with which the analytical solutions for the flat, AdS,
and dS branes are obtained at the critical point of the critical gravity. It is
found that all these branes are embedded in an AdS spacetime, but, in
general, the effective cosmological constant of the AdS
spacetime is not equal to the naked one in the critical gravity,
which can be positive, zero, and negative. Another interesting result is that
the brane tension can also be positive, zero, or negative, depending on the
symmetry of the thin brane and the values of the parameters of the theory,
which is very different from the case in general relativity. It is shown that
the mass hierarchy problem can be solved in the braneworld model in the
higher-derivative critical gravity. We also study the thick brane model and
find analytical and numerical solutions of the flat, AdS, and dS branes. It is
find that some branes will have inner structure when some parameters of the
theory are larger than their critical values, which may result in resonant KK
modes for some bulk matter fields. The flat branes with positive energy density
and AdS branes with negative energy density are embedded in an -dimensional
AdS spacetime, while the dS branes with positive energy density are embedded in
an -dimensional Minkowski one.Comment: 14 pages, 7 figures, updated version, accepted by EPJ
Modelling Work Effort of Workers in the Crowdsourcing Intermediary Market
This study examines crowdsourcing task characteristics (skill variety, task identity, task significance, autonomy, feedback, and task clarity) and the online work situation factor; that is, the trust in evaluations on work effort in the crowdsourcing intermediary market. An e-questionnaire was released as a crowdsourcing task on the Time Fortune website in China; data from 231 valid questionnaires were analyzed using SmartPLS 3 software. Results show that under the conditions of this study, crowdsourcing workersâ internal motivation has a significant positive relationship with their effort. Task autonomy and feedback have significant and positive relationship with internal motivation. Skill variety, task significance, task clarity, and task identity have no significant correlation with internal motivation. However, task clarity has a significant and positive relationship with work effort. The study also finds that the effect of workersâ trust in the task requester on work effort is mediated by internal motivation
Looking Forward to Seeing Real Experiences through Photos? It Depends on the Quality of Photos
We investigated whether the quality of photos will exert an influence on the post-evaluation of the experience? Through two experiments, we found that the effect does exist. When people reactivate memories through photos, photos can work in the following ways. First, photos can make the memory related to photo content more prominent. Secondly, photos content can replace the already obscured original memory to a certain extent. When the quality of photos is high, people tend to accept the memory being reprocessed, driven by photos, thus improving the evaluation of the original experience. When the quality of the photos is low, people subconsciously reject the information that photos convey and still insist on the judgment of the original experience. The above scenarios apply when people still have an initial impression on their experiences
General stationary charged black holes as charged particle accelerators
We study the possibility of getting infinite energy in the center of mass
frame of colliding charged particles in a general stationary charged black
hole. For black holes with two-fold degenerate horizon, it is found that
arbitrary high center-of-mass energy can be attained, provided that one of the
particle has critical angular momentum or critical charge, and the remained
parameters of particles and black holes satisfy certain restriction. For black
holes with multiple-fold degenerate event horizons, the restriction is
released. For non-degenerate black holes, the ultra-high center-of-mass is
possible to be reached by invoking the multiple scattering mechanism. We obtain
a condition for the existence of innermost stable circular orbit with critical
angular momentum or charge on any-fold degenerate horizons, which is essential
to get ultra-high center-of-mass energy without fine-tuning problem. We also
discuss the proper time spending by the particle to reach the horizon and the
duality between frame dragging effect and electromagnetic interaction. Some of
these general results are applied to braneworld small black holes.Comment: 23 pages, no figures, revised version accepted for publication in
Phys. Rev.
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