9,058 research outputs found
Study on space-time structure of Higgs boson decay using HBT correlation Method in ee collision at =250 GeV
The space-time structure of the Higgs boson decay are carefully studied with
the HBT correlation method using ee collision events produced through
Monte Carlo generator PYTHIA 8.2 at =250GeV. The Higgs boson jets
(Higgs-jets) are identified by H-tag tracing. The measurement of the Higgs
boson radius and decay lifetime are derived from HBT correlation of its decay
final state pions inside Higgs-jets in the ee collisions events with an
upper bound of fm and fs. This result is consistent with CMS data.Comment: 7 pages,3 figure
1 Hop or 2 hops: Topology analysis in Body Area Network
Wireless Body Area Networks (WBANs) have recently received much attention due to the possibility to be used
in healthcare applications. For these applications, link reliability
and energy efficiency are critical issues, as in many cases, information
carried can be vital for the patient and batteries cannot be easily replaced. The wireless on-body channel experiences significant temporal variation due to body movements and the use of relays is sometimes necessary in order to guarantee reliability or improve lifetime.
In this paper, an experimental evaluation is used to give
a better understanding about reliability, energy consumption
and lifetime in a single hop or a two hops communication.
This analysis keeps into consideration the correlations between propagation on different links which affect simultaneously the time-varying connectivity on different links of the body. Theresults shows that an off-body relays could be used to increase data reliability, minimize energy requirements and maximize network lifetime
Hamilton-Jacobi Method and Gravitation
Studying the behaviour of a quantum field in a classical, curved, spacetime
is an extraordinary task which nobody is able to take on at present time.
Independently by the fact that such problem is not likely to be solved soon,
still we possess the instruments to perform exact predictions in special,
highly symmetric, conditions. Aim of the present contribution is to show how it
is possible to extract quantitative information about a variety of physical
phenomena in very general situations by virtue of the so-called Hamilton-Jacobi
method. In particular, we shall prove the agreement of such semi-classical
method with exact results of quantum field theoretic calculations.Comment: To appear in the proceedings of "Cosmology, the Quantum Vacuum, and
Zeta Functions": A workshop with a celebration of Emilio Elizalde's Sixtieth
birthday, Bellaterra, Barcelona, Spain, 8-10 Mar 201
Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys
The photoelectrochemical behavior of anodic films on Al alloys, containing titanium, tantalum, and tungsten (valve metals), has been studied as a function of alloy composition and anodizing conditions. Photocurrent spectroscopy has been used to get information on bandgap and the flatband potential values of different mixed oxides. Both insulator-like and semiconducting behavior has been observed for anodic oxides grown on Al-W and Al-Ti alloys dependent on alloy initial composition. Optical bandgap values, Eg,opt, of different oxides are in accordance with predictions based on the correlation between Eg,opt and the difference of electronegativities of the oxide constituents, indicating potential for tailoring solid state properties of ternary oxides
Oblique impact breakage unification of nonspherical particles using discrete element method
Particle breakage commonly occurs during processing of particulate materials, but a mechanistic model of particle impact breakage is not fully established. This article presents oblique impact breakage characteristics of nonspherical particles using discrete element method (DEM) simulations. Three different particle shapes, i.e. spherical, cuboidal and cylindrical, are investigated. Constituent spheres are agglomerated with bridging bonds to model the breakage characteristics under impact conditions. The effect of agglomerate shapes on the breakage pattern, damage ratio, and fragment size distribution is fully investigated. By using a newly proposed oblique impact model, unified breakage master surfaces are theoretically constructed for all the particle shapes under oblique impact conditions. The developed approach can be applied to modelling particulate processes where nonspherical particles and oblique impact breakage are prevailing.</p
Numerical Stability issues on Channelized Hotelling Observer under different background assumptions
International audienceThis paper addresses the numerical stability issue on the channelized Hotelling observer (CHO). The CHO is a well-known approach in the medical image quality assessment domain. Many researchers have found that the detection performance of the CHO does not increase with the number of channels, contrary to expectation. And to our knowledge, nobody in this domain has found the reason. We illustrated that this is due to the ill-posed problem of the scatter matrix and proposed a solution based on Tikhonov regularization. Although Tikhonov regularization has been used in many other domains, we show in this paper another important application of Tikhonov regularization. This is very important for researchers to continue the CHO (and other channelized model observer) investigation with a reliable detection performance calculation
The Zeroth Law of Thermodynamics and Volume-Preserving Conservative Dynamics with Equilibrium Stochastic Damping
We propose a mathematical formulation of the zeroth law of thermodynamics and
develop a stochastic dynamical theory, with a consistent irreversible
thermodynamics, for systems possessing sustained conservative stationary
current in phase space while in equilibrium with a heat bath. The theory
generalizes underdamped mechanical equilibrium: , with and respectively
representing phase-volume preserving dynamics and stochastic damping. The
zeroth law implies stationary distribution . We find an
orthogonality as a hallmark of the system. Stochastic
thermodynamics based on time reversal
is formulated: entropy
production ; generalized "heat" ,
being "internal energy", and "free
energy" never increases.
Entropy follows . Our formulation is shown to
be consistent with an earlier theory of P. Ao. Its contradistinctions to other
theories, potential-flux decomposition, stochastic Hamiltonian system with even
and odd variables, Klein-Kramers equation, Freidlin-Wentzell's theory, and
GENERIC, are discussed.Comment: 25 page
Transcriptional Regulation of Osteoblasts
The differentiation of osteoblasts from mesenchymal precursors requires a series of cell fate decisions controlled by a hierarchy of transcription factors. Among these are RUNX2, Osterix (OSX), ATF4, and a large number of nuclear coregulators. During bone development, initial RUNX2 expression coincides with the formation of mesenchymal condensations well before the branching of chondrogenic and osteogenic lineages. Given that RUNX2 is expressed so early and participates in several stages of bone formation, it is not surprising that it is subject to a variety of controls. These include regulation by nuclear accessory factors and posttranslational modification, especially phosphorylation. Specific examples of RUNX2 regulation include interactions with DLX proteins and ATF4 and phosphorylation by the ERK/MAP kinase pathway. RUNX2 is regulated via phosphorylation of critical serine residues in the P/S/T domain. MAPK activation of RUNX2 was also found to occur in vivo . Transgenic expression of constitutively active MEK1 in osteoblasts accelerated skeletal development while a dominant-negative MEK1 retarded development in a RUNX2-dependent manner. These studies allow us to begin understanding the complex mechanisms necessary to fine-tune bone formation in response to extracellular stimuli including ECM interactions, mechanical loads, and hormonal stimulation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/75356/1/annals.1402.081.pd
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