1,093 research outputs found
AMMP-EXTN: A User Privacy and Collaboration Control Framework for a Multi-User Collaboratory Virtual Reality System
In this thesis, we propose a new design of privacy and session control for improving a collaborative molecular modeling CVR system AMMP-VIS [1]. The design mainly addresses the issue of competing user interests and privacy protection coordination. Based on our investigation of AMMP-VIS, we propose a four-level access control structure for collaborative sessions and dynamic action priority specification for manipulations on shared molecular models. Our design allows a single user to participate in multiple simultaneous sessions. Moreover, a messaging system with text chatting and system broadcasting functionality is included. A 2D user interface [2] for easy command invocation is developed in Python. Two other key aspects of system implementation, the collaboration Central deployment and the 2D GUI for control are also discussed. Finally, we describe our system evaluation plan which is based on an improved cognitive walkthrough and heuristic evaluation as well as statistical usage data
Cross-Media Wireless Made Easier: Tuning Media Interfaces with Flexible Metasurfaces
Emerging wireless IoT applications increasingly venture beyond over-the-air
communication, such as deep-tissue networking for implantable sensors,
air-water communication for ocean monitoring, and soil sensing. These
applications face the fundamental challenge of significant power loss due to
reflection at media interfaces. We present RF-Mediator, a programmable
metasurface system placed at media interfaces to virtually mask the presence of
the physical boundary. It is designed as a single-layer metasurface comprising
arrays of varactor-based elements. By tuning the bias voltage element-wise, the
surface mediates between media on both sides dynamically and beamforms towards
the endpoint to boost transmission through the interface, as if no media
interface existed. The control algorithm determines the surface configuration
by probing the search space efficiently. We fabricate the surface on a thin,
flexible substrate, and experiment with several cross-media setups. Extensive
evaluation shows that RF-Mediator provides a median power gain of 8 dB for
air-to-tissue links and up to 30 dB for cross-media backscatter links
Electronic band gaps and transport properties in periodically alternating mono- and bi-layer graphene superlattices
We investigate the electronic band structure and transport properties of
periodically alternating mono- and bi-layer graphene superlattices (MBLG SLs).
In such MBLG SLs, there exists a zero-averaged wave vector
(zero-) gap that is insensitive to the lattice constant. This
zero- gap can be controlled by changing both the ratio of the
potential widths and the interlayer coupling coefficient of the bilayer
graphene. We also show that there exist extra Dirac points; the conditions for
these extra Dirac points are presented analytically. Lastly, we demonstrate
that the electronic transport properties and the energy gap of the first two
bands in MBLG SLs are tunable through adjustment of the interlayer coupling and
the width ratio of the periodic mono- and bi-layer graphene.Comment: More discussion is added and the English is polished. Accepted for
publication in EP
Effects of Phi and -meson on properties of hyperon stars including resonance
In this work, we study the properties of neutron stars using the linear
Relativistic Mean-Field (RMF) theory and consider multiple degrees of freedom
inside neutron stars, including hyperons and resonances. We
investigate different coupling parameters between
resonances and nucleons and compare the differences between neutron stars with
and without strange mesons and . These effects include
particle number distributions, equations of state (EOS), mass-radius relations,
and tidal deformabilities. To overcome the "hyperon puzzle," we employ the
scheme to obtain neutron stars with masses up to . We
find that strange mesons appear at around 3 and reduce the critical
density of baryons in the high-density region. With increasing coupling
parameter , the resonances suppress hyperons,
leading to a shift of the critical density towards lower values. The early
appearance of resonances may play a crucial role in the stability of
neutron stars. Strange mesons soften the EOS slightly, while
resonances predominantly soften the EOS in the low-density region. By
calculating tidal deformabilities and comparing with astronomical observation
GW170817, we find that the inclusion of resonances decreases the
radius of neutron stars.Comment: 10 pages, 9 figure
Kaon Meson Condensation and resonance of Hyperonized Star with relativistic mean-field model
We study the equation of state of dense baryon matter within the relativistic
mean-field model, and we include (1232) isobars into IUFSU model with
hyperons and consider the possibility of kaon meson condensation. We find that
it is necessary to consider the resonance state inside the massive
neutron star. The critical density of Kaon mesons and hyperons is shifted to a
higher density region, in this respect an early appearance of
resonances is crucial to guarantee the stability of the branch of hyperonized
star with the difference of the coupling parameter
constrained based on the QCD rules in nuclear matter. The resonance
produces a softer equation of state in the low density region, which makes the
tidal deformability and radius consistent with the observation of GW170817. As
the addition of new degrees of freedom will lead to a softening of the equation
of state, the -cut scheme, which states the decrease of neutron star
mass can be lowered if one assumes a limited decrease of the -meson
strength at (), finally we get a maximum mass
neutron star with resonance heavier than 2.Comment: 10 pages, 9 figure
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