8,212 research outputs found
On maximal area integral problem for analytic functions in the starlike family
For an analytic function defined on the unit disk , let
denote the area of the image of the subdisk under ,
where . In 1990, Yamashita conjectured that for convex functions and it was finally settled in 2013 by
Obradovi\'{c} and et. al.. In this paper, we consider a class of analytic
functions in the unit disk satisfying the subordination relation
for and
. We prove Yamashita's conjecture problem for functions in this
class, which solves a partial solution to an open problem posed by Ponnusamy
and Wirths.Comment: 12 pages, 8 figures, 2 tables, submitted to a journa
On a generalization of close-to-convex functions
A motivation comes from {\em M. Ismail and et al.: A generalization of
starlike functions, Complex Variables Theory Appl., 14 (1990), 77--84} to study
a generalization of close-to-convex functions by means of a -analog of a
difference operator acting on analytic functions in the unit disk
. We use the terminology {\em
-close-to-convex functions} for the -analog of close-to-convex functions.
The -theory has wide applications in special functions and quantum physics
which makes the study interesting and pertinent in this field. In this paper,
we obtain some interesting results concerning conditions on the coefficients of
power series of functions analytic in the unit disk which ensure that they
generate functions in the -close-to-convex family. As a result we find
certain dilogarithm functions that are contained in this family. Secondly, we
also study the famous Bieberbach conjecture problem on coefficients of analytic
-close-to-convex functions. This produces several power series of analytic
functions convergent to basic hypergeometric functions.Comment: 14 pages, to appear in a journal (this version of the paper may not
be the final version
CPMD/GULP QM/MM Interface for Modeling Periodic Solids: Implementation and its Application in the Study of Y-Zeolite Supported Rh Clusters
We report here the development of hybrid quantum mechanics/molecular
mechanics (QM/MM) interface between the plane-wave density functional theory
based CPMD code and the empirical force-field based GULP code for modeling
periodic solids and surfaces. The hybrid QM/MM interface is based on the
electrostatic coupling between QM and MM regions. The interface is designed for
carrying out full relaxation of all the QM and MM atoms during geometry
optimizations and molecular dynamics simulations, including the boundary atoms.
Both Born-Oppenheimer and Car-Parrinello molecular dynamics schemes are enabled
for the QM part during the QM/MM calculations. This interface has the advantage
of parallelization of both the programs such that the QM and MM force
evaluations can be carried out in parallel in order to model large systems. The
interface program is first validated for total energy conservation and parallel
scaling performance is benchmarked. Oxygen vacancy in {\alpha}-cristobalite is
then studied in detail and the results are compared with a fully QM calculation
and experimental data. Subsequently, we use our implementation to investigate
the structure of rhodium cluster (Rh ; =2 to 6) formed from
Rh(CH) complex adsorbed within a cavity of Y-zeolite in a reducible
atmosphere of H gas.Comment: 15 pages; 10 pages; Accepted in Journal of Computational Chemistry
(2016
An Optimized Ion Trap Geometry to Measure Quadrupole Shifts of Yb Clocks
We propose a new ion-trap geometry to carry out accurate measurements of the
quadrupole shifts in the Yb-ion. This trap will produce nearly ideal
harmonic potential where the quadrupole shifts due to the anharmonic components
can be reduced by four orders of magnitude. This will be useful to reduce the
uncertainties in the clock frequency measurements of the and transitions, from which we can deduce precise values of the
quadrupole moments (s) of the and states. Moreover, it may be able to affirm validity of the
measured value of the state where three
independent theoretical studies defer almost by one order in magnitude from the
measurement. We also perform calculations of s using the relativistic
coupled-cluster (RCC) method. We use these values to estimate
quadrupole shift that can be measured in our proposed ion trap experiment.Comment: 1 table, 5 figure
Non-abelian representations of the slim dense near hexagons on 81 and 243 points
We prove that the near hexagon has a non-abelian
representation in the extra-special 2-group and that the near
hexagon has a non-abelian representation in the
extra-special 2-group . The description of the non-abelian
representation of makes use of a new combinatorial
construction of this near hexagon
Neutron star matter with strange interactions in a relativistic quark model
The effect of strange interactions in neutron star matter and the role of the
strange meson-hyperon couplings are studied in a relativistic quark model where
the confining interaction for quarks inside a baryon is represented by a
phenomenological average potential in an equally mixed scalar-vector harmonic
form. The hadron-hadron interaction in nuclear matter is then realized by
introducing additional quark couplings to , , ,
and mesons through mean-field approximations. The
meson-baryon couplings are fixed through the SU(6) spin-flavor symmetry and the
SU(3) flavor symmetry to determine the hadronic equation of state (EoS). We
find that the SU(3) coupling set gives the potential depth between s
around MeV and favours a stiffer EoS.The radius for the canonical neutron
star lies within a range of to km.Comment: 9 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:1609.02708, arXiv:1702.0231
Smart Highway
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Structure related optical properties of electron beam evaporated ZrO2:10%SiO2 thin films
ZrO2:10%SiO2 thinfilms have been deposited on fused silica substrate by
reactive electron beam co-evaporation technique at different oxygen partial
pressure. The structural analysis shows tetragonal phase with residual tensile
stress in the films. The intensity of the tetragonal t(110) phase are found
increasing with increasing oxygen pressure. The optical band gap is found
increasing from 5.06 eV to 5.28 eV because of increasing crystalinity of
monoclinic phase, while the film grain size remains almost constant with
increase of oxygen pressure, concludes that the crystallite or grain size has
no effect on the optical properties of the films. The dispersion of the
refractive index is discussed in terms of single oscillator Wimple-DiDomenico
model. The dispersion energy parameter better known as structural order
parameter are found increasing with the intensity of t(110) phase. It is
observed that films having higher value of order parameter show lower surface
roughness which concludes that the local microstructure ordering can
predominantly influence the grain morphology which in turn can lead to better
surface for higher value of order parameter.Comment: 10 pages, 10 figures and one tabl
Nuclear symmetry energy in a modified quark meson coupling model
We study nuclear symmetry energy and the thermodynamic instabilities of
asymmetric nuclear matter in a self-consistent manner by using a modified
quark-meson coupling model where the confining interaction for quarks inside a
nucleon is represented by a phenomenologically averaged potential in an equally
mixed scalar-vector harmonic form. The nucleon-nucleon interaction in nuclear
matter is then realized by introducing additional quark couplings to ,
, and mesons through mean-field approximations. We find an
analytic expression for the symmetry energy as a function of
its slope . Our result establishes a linear correlation between and
. We also analyze the constraint on neutron star radii in
matter with equilibrium
Characterization of Micro-Roughness Parameters and Optical Properties of Obliquely Deposited HfO2 Thin Films
Oblique angle deposited oxide thin films have opened up new dimensions in
fabricating optical interference devices with tailored refractive index profile
along thickness by tuning its microstructure by varying angle of deposition.
Microstructure of thin films strongly affects surface morphology as well as
optical properties. Since surface morphology plays an important role for the
qualification of thin film devices for optical or other applications, it is
important to investigate morphological properties. In present work, HfO2 thin
films have been deposited at several oblique angles. Morphological statistical
parameters of such thin films viz., correlation length, intrinsic roughness,
fractal spectral strength, etc., have been determined through suitable
modelling of extended power spectral density function. Intrinsic roughness and
fractal spectral strength show an interesting behaviour with deposition angle
and the same has been discussed in the light of atomic shadowing, re-emission
and diffusion of ad-atoms. Further refractive index and thickness of such thin
films have been estimated from transmission spectra. Refractive index and grain
size depict an opposite trend with deposition angle and their variation has
been explained by varying column slanting angle and film porosity with
deposition angle.Comment: 23 pages including figure
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