70,835 research outputs found
Weighted Density Approximation Description of Insulating YH and LaH
Density functional calculations within the weighted density approximation
(WDA) are presented for YH and LaH. We investigate some commonly used
pair-distribution functions G. These calculations show that within a consistent
density functional framework a substantial insulating gap can be obtained while
at the same time retaining structural properties in accord with experimental
data. Our WDA band structures agree with those of approximation very well,
but the calculated band gaps are still 1.0-2.0 eV smaller than experimental
findings.Comment: 6 Pages, 3 figure
Low Voltage Floating Gate MOS Transistor Based Four-Quadrant Multiplier
This paper presents a four-quadrant multiplier based on square-law characteristic of floating gate MOSFET (FGMOS) in saturation region. The proposed circuit uses square-difference identity and the differential voltage squarer proposed by Gupta et al. to implement the multiplication function. The proposed multiplier employs eight FGMOS transistors and two resistors only. The FGMOS implementation of the multiplier allows low voltage operation, reduced power consumption and minimum transistor count. The second order effects caused due to mobility degradation, component mismatch and temperature variations are discussed. Performance of the proposed circuit is verified at ±0.75 V in TSMC 0.18 µm CMOS, BSIM3 and Level 49 technology by using Cadence Spectre simulator
Firms Growth Dynamics, Competition and Power Law Scaling
We study the growth dynamics of the size of manufacturing firms considering
competition and normal distribution of competency. We start with the fact that
all components of the system struggle with each other for growth as happened in
real competitive bussiness world. The detailed quantitative agreement of the
theory with empirical results of firms growth based on a large economic
database spanning over 20 years is good .Further we find that this basic law of
competition leads approximately a power law scaling over a wide range of
parameters. The empirical datas are in accordance with present theory rather
than a simple power law.Comment: 10 pages, 8 figure
A technique for adding range restrictions to generalized searching problems
In a generalized searching problem, a set of colored geometric objects has to be stored in a data structure, such that for any given query object , the distinct colors of the objects of intersected by can be reported efficiently. In this paper, a general technique is presented for adding a range restriction to such a problem. The technique is applied to the problem of querying a set of colored points (resp.\ fat triangles) with a fat triangle (resp.\ point). For both problems, a data structure is obtained having size and query time . Here, denotes the number of colors reported by the query, and is an arbitrarily small positive constant
Barrier modification in sub-barrier fusion reactions using Wong formula with Skyrme forces in semiclassical formalism
We obtain the nuclear proximity potential by using semiclassical extended
Thomas Fermi (ETF) approach in Skyrme energy density formalism (SEDF), and use
it in the extended -summed Wong formula under frozen density
approximation. This method has the advantage of allowing the use of different
Skyrme forces, giving different barriers. Thus, for a given reaction, we could
choose a Skyrme force with proper barrier characteristics, not-requiring extra
``barrier lowering" or ``barrier narrowing" for a best fit to data. For the
Ni+Mo reaction, the -summed Wong formula, with effects of
deformations and orientations of nuclei included, fits the fusion-evaporation
cross section data exactly for the force GSkI, requiring additional barrier
modifications for forces SIII and SV. However, the same for other similar
reactions, like Ni+Ni, fits the data best for SIII force.
Hence, the barrier modification effects in -summed Wong expression
depends on the choice of Skyrme force in extended ETF method.Comment: INPC2010, Vancouver, CANAD
Dynamical cluster-decay model for hot and rotating light-mass nuclear systems, applied to low-energy S + Mg Ni reaction
The dynamical cluster-decay model (DCM) is developed further for the decay of
hot and rotating compound nuclei (CN) formed in light heavy-ion reactions. The
model is worked out in terms of only one parameter, namely the neck-length
parameter, which is related to the total kinetic energy TKE(T) or effective
Q-value at temperature T of the hot CN, defined in terms of the
both the light-particles (LP), with 4, Z 2, as well as the
complex intermediate mass fragments (IMF), with , is
considered as the dynamical collective mass motion of preformed clusters
through the barrier. Within the same dynamical model treatment, the LPs are
shown to have different characteristics as compared to the IMFs. The systematic
variation of the LP emission cross section , and IMF emission
cross section , calculated on the present DCM match exactly the
statistical fission model predictions. It is for the first time that a
non-statistical dynamical description is developed for the emission of
light-particles from the hot and rotating CN. The model is applied to the decay
of Ni formed in the S + Mg reaction at two incident
energies E = 51.6 and 60.5 MeV. Both the IMFs and average
spectra are found to compare reasonably nicely with the experimental data,
favoring asymmetric mass distributions. The LPs emission cross section is shown
to depend strongly on the type of emitted particles and their multiplicities
Understanding the effects of geometry and rotation on pulsar intensity profiles
We have developed a method to compute the possible distribution of radio
emission regions in a typical pulsar magnetosphere, taking into account the
viewing geometry and rotational effects of the neutron star. Our method can
estimate the emission altitude and the radius of curvature of particle
trajectory as a function of rotation phase for a given inclination angle,
impact angle, spin-period, Lorentz factor, field line constant and the
observation frequency. Further, using curvature radiation as the basic emission
mechanism, we simulate the radio intensity profiles that would be observed from
a given distribution of emission regions, for different values of radio
frequency and Lorentz factor. We show clearly that rotation effects can
introduce significant asymmetries into the observed radio profiles. We
investigate the dependency of profile features on various pulsar parameters. We
find that the radiation from a given ring of field lines can be seen over a
large range of pulse longitudes, originating at different altitudes, with
varying spectral intensity. Preferred heights of emission along discrete sets
of field lines are required to reproduce realistic pulsar profiles, and we
illustrate this for a known pulsar. Finally, we show how our model provides
feasible explanations for the origin of core emission, and also for one-sided
cones which have been observed in some pulsars.Comment: 21 pages, 11 figures, accepted for publication in MNRA
- …