156 research outputs found
Plasmonic Effect on the Population Dynamics and the Optical Response in a Hybrid V-Type Three-Level Quantum Dot-Metallic Nanoparticle Nanosystem
We investigated theoretically the exciton-plasmon coupling effects on the
population dynamics and the absorption properties of a hybrid nanosystem
composed of a metal nanoparticle (MNP) and a V-type three level semiconductor
quantum dot (SQD), which are created by the interaction with the induced dipole
moments in the SQD and the MNP, respectively. Excitons of the SQD and the
plasmons of the MNP in such a hybrid nanosystem could be coupled strongly or
weakly to demonstrate novel properties of the hybrid system. Our results show
that the nonlinear optical response of the hybrid nanosystem can be greatly
enhanced or depressed due to the exciton-plasmon couplings.Comment: 12 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:1507.0445
Numerical analysis for a unified 2 factor model of structural and reduced form types for corporate bonds with fixed discrete coupon
Conditions of Stability for explicit finite difference scheme and some
results of numerical analysis for a unified 2 factor model of structural and
reduced form types for corporate bonds with fixed discrete coupon are provided.
It seems to be difficult to get solution formula for PDE model which
generalizes Agliardi's structural model [1] for discrete coupon bonds into a
unified 2 factor model of structural and reduced form types and we study a
numerical analysis for it by explicit finite difference scheme. These equations
are parabolic equations with 3 variables and they include mixed derivatives, so
the explicit finite difference scheme is not stable in general. We find
conditions for the explicit finite difference scheme to be stable, in the case
that it is stable, numerically compute the price of the bond and analyze its
credit spread and duration.Comment: 15 pages, 12 figure
A Stable Minutia Descriptor based on Gabor Wavelet and Linear Discriminant Analysis
The minutia descriptor which describes characteristics of minutia, plays a
major role in fingerprint recognition. Typically, fingerprint recognition
systems employ minutia descriptors to find potential correspondence between
minutiae, and they use similarity between two minutia descriptors to calculate
overall similarity between two fingerprint images. A good minutia descriptor
can improve recognition accuracy of fingerprint recognition system and largely
reduce comparing time. A good minutia descriptor should have high ability to
distinguish between different minutiae and at the same time should be robust in
difficult conditions including poor quality image and small size image. It also
should be effective in computational cost of similarity among descriptors. In
this paper, a robust minutia descriptor is constructed using Gabor wavelet and
linear discriminant analysis. This minutia descriptor has high distinguishing
ability, stability and simple comparing method. Experimental results on FVC2004
and FVC2006 databases show that the proposed minutia descriptor is very
effective in fingerprint recognition
Population Dynamics and the Optical Absorption in Hybrid Metal Nanoparticle - Semiconductor Quantum dot Nanosystem
We studied theoretically the population dynamics and the absorption spectrum
of hybrid nanosystem consisted of a matal nanoparticle (MNP) and a
semiconductor quantum dot(SQD). We investigated the exciton-plasmon coupling
effects on the population dynamics and the absorption properties of the
nanostructure. Our results show that the nonlinear optical response of the
hybrid nanosystem can be greatly enhanced or depressed due to the
exciton-plasmon couplings. The results obtained here may have the potential
applications of nanoscale optical devices such as optical switches and quantum
devices such as a single photon transistor.Comment: 12 pages, 5 figure
Symmetry breaking and effective photon mass
We suggest a possibility that the photon can acquire a finite mass in a
medium when the external interaction and symmetry is broken on the basis of
Chern-Simons gauge theory
Classical Equation of Electromagnetic Field in the Higgs Boson Field and Estimation on the Static Electrical Polarizability of Leptons
In our paper we derived the classical motion equation of electromagnetic
field in space with Higgs field and by means of it discussed the distributions
of charge and current formed when the static electrical and magnetic fields are
interacting with the spherically symmetrical Higgs field, and predicted the
electrical polarizability of electron
Investigation of the Cubic Boron Nitride Nucleation under the High Pressure and the High Temperature
In this paper we have theoretically found the activation energy
() for the transformation from hBN to cBN in the microscopic
viewpoint. We have introduced an analytical formula representing the dependence
of nucleus formation time on the activation energy, synthesis pressure and
temperature. We have theoretically determined the boundary line of cBN nucleus
formation region in the phase diagram on the basis of the diffusion
mechanism of cBN nucleus formation. We have found that the cBN crystal nucleus
formation time is less than by comparing of the theory and experiment
The Binomial Tree Method and Explicit Difference Schemes for American Options with Time Dependent Coefficients
Binomial tree methods (BTM) and explicit difference schemes (EDS) for the
variational inequality model of American options with time dependent
coefficients are studied. When volatility is time dependent, it is not
reasonable to assume that the dynamics of the underlying asset's price forms a
binomial tree if a partition of time interval with equal parts is used. A time
interval partition method that allows binomial tree dynamics of the underlying
asset's price is provided. Conditions under which the prices of American option
by BTM and EDS have the monotonic property on time variable are found. Using
convergence of EDS for variational inequality model of American options to
viscosity solution the decreasing property of the price of American put options
and increasing property of the optimal exercise boundary on time variable are
proved. First, put options are considered. Then the linear homogeneity and
call-put symmetry of the price functions in the BTM and the EDS for the
variational inequality model of American options with time dependent
coefficients are studied and using them call options are studied.Comment: 39 pages, 4 figures; In this version, some new results for American
call options are added in Sections 6,7 and
Experimental study on the influence of binders on plastic deformation during sintering of cubic boron nitride powder under high pressure and high temperature
In this work, sintered polycrystalline cubic boron nitride (cBN) compacts,
with titanium carbonitride (TiC0.7N0.3) and titanium nitride (TiN),
respectively, as binders, were prepared at temperature of 1450{\deg}C and
pressure of 5.5 GPa during 3 minutes, and the influence of binders on the
plastic deformation of cBN powder due to the sintering process was
experimentally investigated by X-ray diffraction (XRD) analysis. It was shown
that the sintered compact with titanium carbonitride as a binder displays more
intense plastic deformation of cBN grains than that with titanium nitride
binder. This result indicated that if the binders are different, then products
formed during sintering of cBN powders under high pressure and high temperature
(HP-HT) are different so that the stress concentration at the cBN grain
boundaries and a pinning effect, reducing the mobility of the dislocations and
preventing annealing, are different in two cases
Reductive property of new fuzzy reasoning method based on distance measure
Firstly in this paper we propose a new criterion function for evaluation of
the reductive property about the fuzzy reasoning result for fuzzy modus ponens
and fuzzy modus tollens. Secondly unlike fuzzy reasoning methods based on the
similarity measure, we propose a new fuzzy reasoning method based on distance
measure. Thirdly the reductive property for 5 fuzzy reasoning methods are
checked with respect to fuzzy modus ponens and fuzzy modus tollens. Through the
experiment, we show that proposed method is better than the previous methods in
accordance with human thinking
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