181 research outputs found
Steady-State Analysis of Necrotic Core Formation for Solid Avascular Tumors with Time Delays in Regulatory Apoptosis
A mathematical model for the growth of solid avascular tumor with time delays in regulatory apoptosis is studied. The existence of stationary solutions and the mechanism of formation of necrotic cores in the growth of the tumors are studied. The results show that if the natural death rate of the tumor cell exceeds a fixed positive constant, then
the dormant tumor is nonnecrotic; otherwise, the dormant tumor is necrotic
Monitoring Energy Consumption of Smartphones
With the rapid development of new and innovative applications for mobile
devices like smartphones, advances in battery technology have not kept pace
with rapidly growing energy demands. Thus energy consumption has become a more
and more important issue of mobile devices. To meet the requirements of saving
energy, it is critical to monitor and analyze the energy consumption of
applications on smartphones. For this purpose, we develop a smart energy
monitoring system called SEMO for smartphones using Android operating system.
It can profile mobile applications with battery usage information, which is
vital for both developers and users.Comment: The 1st International Workshop on Sensing, Networking, and Computing
with Smartphones (PhoneCom), IEEE, Dalian, China, Oct 19-22, 201
Finite-Dimensional Bistable Topological Insulators:From Small to Large
Photonic topological insulators supporting unidirectional topologically
protected edge states represent attractive platform for realization of
disorder- and backscattering-immune transport of edge excitations in both
linear and nonlinear regimes. In many realizations of topological insulators
structured periodic materials are used, since they may admit specific Dirac
degeneracy in the spectrum, around which unidirectional edge states appear
under the action of physical effects breaking time-reversal symmetry. While
properties of the edge states at unclosed interfaces of two bulk media with
different topology are known, the existence of the edge states in practical
finite-dimensional topological insulators fully immersed in nontopological
environment remains largely unexplored. In this work using as an example
realistic polariton topological insulators built from small-size honeycomb
arrays of microcavity pillars, we illustrate how topological properties of the
system build up upon gradual increase of its dimensionality. To account for
dissipative nature of polariton condensate forming in the array of microcavity
pillars, we consider the impact of losses and resonant pump leading to rich
bistability effects in this system. We describe the mechanism in accordance
with which trivial-phase pump "selects" and excites specific nonlinear
topological edge states circulating along the periphery of the structure in the
azimuthal direction dictated by the direction of the external applied magnetic
field. We also show the possibility of utilization of vortex pump with
different topological charges for selective excitation of different edge
currents.Comment: 7 pages, 6 figure
Preparation of AuNPs/GQDs/SiO 2
Composites of gold nanoparticles and graphene quantum dots (AuNPs/GQDs) exhibit excellent dispersibility in aqueous solutions. Thus, it is difficult to separate them from wet reaction systems when they are used as catalysts. To resolve this issue, in this study, an AuNPs/GQDs composite was immobilized on silicon dioxide through the hydrothermal method, which involved the formation of an amide bond between the surface GQDs of the AuNPs/GQDs composite and the amino group of the silane. The as-synthesized AuNPs/GQDs/SiO2 composite was found to be suitable for use as a heterogeneous catalyst for the oxidation of veratryl alcohol in water and exhibited catalytic activity comparable to that of bare AuNPs/GQDs as well as better recyclability
- …