9,380 research outputs found
Heavy-ion interaction potential deduced from density-constrained TDHF calculation
We present a new method for calculating the heavy-ion interaction potential
from a density-constrained time-dependent Hartree-Fock calculation.Comment: 4 pages, 3 figure
Ion-tracer anemometer
Gas velocity measuring instrument measures transport time of ion-trace traveling fixed distance between ionization probe and detector probe. Electric field superimposes drift velocity onto flow velocity so travel times can be reduced to minimize ion diffusion effects
Infinite dimensional stochastic differential equations of Ornstein-Uhlenbeck type
We consider the operator \sL f(x)=\tfrac12 \sum_{i,j=1}^\infty
a_{ij}(x)\frac{\del^2 f}{\del x_i \del x_j}(x)-\sum_{i=1}^\infty \lam_i x_i
b_i(x) \frac{\del f}{\del x_i}(x). We prove existence and uniqueness of
solutions to the martingale problem for this operator under appropriate
conditions on the , and \lam_i. The process corresponding to
\sL solves an infinite dimensional stochastic differential equation similar
to that for the infinite dimensional Ornstein-Uhlenbeck process
Vibrational Fundamentals of CF2N2 from the Ultraviolet Absorption Spectrum
Vibration fundamentals of cyclic difluorodiazirine compound from ultraviolet absorption spectru
Transition from subbarrier to deep subbarrier regimes in heavy-ion fusion reactions
We analyze the recent experimental data of heavy-ion fusion cross sections
available up to deep subbarrier energies in order to discuss the threshold
incident energy for a deep subbarrier fusion hindrance phenomenon. To this end,
we employ a one-dimensional potential model with a Woods-Saxon internuclear
potential. Fitting the experimental data in two different energy regions with
different Woods-Saxon potentials, we define the threshold energy as an
intersect of the two fusion excitation functions. We show that the threshold
energies so extracted are in good agreement with the empirical systematics as
well as with the values of the Krappe-Nix-Sierk (KNS) potential at the touching
point. We also discuss the asymptotic energy shift of fusion cross sections
with respect to the potential model calculations, and show that it decreases
with decreasing energies in the deep subbarrier region although it takes a
constant value at subbarrier energies.Comment: 4 pages, 4 figure
Heavy-quark axial charges to non-leading order
We combine Witten's renormalization group with the matching conditions of
Bernreuther and Wetzel to calculate at next-to-leading order the complete
heavy-quark contribution to the neutral-current axial-charge measurable in
neutrino-proton elastic scattering. Our results are manifestly renormalization
group invariant.Comment: 5 pages, revtex styl
Correlated Emission of Hadrons from Recombination of Correlated Partons
We discuss different sources of hadron correlations in relativistic heavy ion
collisions. We show that correlations among partons in a quasi-thermal medium
can lead to the correlated emission of hadrons by quark recombination and argue
that this mechanism offers a plausible explanation for the dihadron
correlations in the few GeV/c momentum range observed in Au+Au collisions at
RHIC.Comment: 4 pages, 2 figures; v2: typo on p.4 correcte
A Game of Attribute Decomposition for Software Architecture Design
Attribute-driven software architecture design aims to provide decision
support by taking into account the quality attributes of softwares. A central
question in this process is: What architecture design best fulfills the
desirable software requirements? To answer this question, a system designer
needs to make tradeoffs among several potentially conflicting quality
attributes. Such decisions are normally ad-hoc and rely heavily on experiences.
We propose a mathematical approach to tackle this problem. Game theory
naturally provides the basic language: Players represent requirements, and
strategies involve setting up coalitions among the players. In this way we
propose a novel model, called decomposition game, for attribute-driven design.
We present its solution concept based on the notion of cohesion and
expansion-freedom and prove that a solution always exists. We then investigate
the computational complexity of obtaining a solution. The game model and the
algorithms may serve as a general framework for providing useful guidance for
software architecture design. We present our results through running examples
and a case study on a real-life software project.Comment: 23 pages, 5 figures, a shorter version to appear at 12th
International Colloquium on Theoretical Aspects of Computing (ICTAC 2015
Spin constraints on Regge predictions and perturbative evolution in high energy collisions
Two key issues in the application of perturbative QCD and Regge predictions
to high energy processes are whether the hard and soft pomerons should be
considered as two separate distinct exchanges and whether the Regge intercepts
are Q^2 independent or not. Models involving a distinct hard pomeron exchange
predict much larger values for the LHC total cross-section. Here we argue that
there is a polarized analogue of this issue in the isovector part of the spin
structure function g_1 and that the spin data appear to favour a distinct hard
exchange.Comment: 8 page
An absorption spectrum amplifier for determining gas composition
Compositions of gas samples are frequently studied by laser absorption spectroscopy. Sensitivity is improved by two orders of magnitude when absorption cell is placed inside an organic-dye laser cavity
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