1,607 research outputs found
The Role of Tensor Force in Heavy-Ion Fusion Dynamics
The tensor force is implemented into the time-dependent Hartree-Fock (TDHF)
theory so that both exotic and stable collision partners, as well as their
dynamics in heavy-ion fusion, can be described microscopically. The role of
tensor force on fusion dynamics is systematically investigated for
, ,
, , and
reactions which vary by the total number of
spin-unsaturated magic numbers in target and projectile. A notable effect on
fusion barriers and cross sections is observed by the inclusion of tensor
force. The origin of this effect is analyzed. The influence of isoscalar and
isovector tensor terms is investigated with the T forces. These effects of
tensor force in fusion dynamics are essentially attributed to the shift of
low-lying vibration states of colliding partners and nucleon transfer in the
asymmetric reactions. Our calculations of above-barrier fusion cross sections
also show that tensor force does not significantly affect the dynamical
dissipation at near-barrier energies
Intrinsically Motivated Learning of Visual Motion Perception and Smooth Pursuit
We extend the framework of efficient coding, which has been used to model the
development of sensory processing in isolation, to model the development of the
perception/action cycle. Our extension combines sparse coding and reinforcement
learning so that sensory processing and behavior co-develop to optimize a
shared intrinsic motivational signal: the fidelity of the neural encoding of
the sensory input under resource constraints. Applying this framework to a
model system consisting of an active eye behaving in a time varying
environment, we find that this generic principle leads to the simultaneous
development of both smooth pursuit behavior and model neurons whose properties
are similar to those of primary visual cortical neurons selective for different
directions of visual motion. We suggest that this general principle may form
the basis for a unified and integrated explanation of many perception/action
loops.Comment: 6 pages, 5 figure
Four-part differential leukocyte count using ÎĽflow cytometer
This paper reports the four-part differential leukocyte
count (DLC) of human blood using a MEMS
microflow (ÎĽflow) cytometer. It is achieved with a
two-color laser-induced fluorescence (LIF) detection
scheme. Four types of leukocytes including
neutrophils, eosinophils, lymphocytes and monocytes
are identified in blood samples, which are stained by
fluorescein isothiocyanate (FITC) and propidium
iodide (PI). The DLC results show good correlation
with the count from a commercial hematology
analyzer. The whole system is also implemented into a
portable instrument for space application
Standard Model of Particle Physics Violating Crypto-Nonlocal Realism
It has been well established that quantum mechanics (QM) violates Bell
inequalities (BI), which are consequences of local realism (LR). Remarkably QM
also violates Leggett inequalities (LI), which are consequences of a class of
nonlocal realism called crypto-nonlocal realism (CNR). Both LR and CNR assume
that measurement outcomes are determined by preexisting objective properties,
as well as hidden variables (HV) not considered in QM. We extend CNR and LI to
include the case that the measurement settings are not externally fixed, but
determined by hidden variables (HV). We derive a new version of LI, which is
then shown to be violated by entangled mesons, if
charge-conjugation-parity (CP) symmetry is indirectly violated, as indeed
established. The experimental result is quantitatively estimated by using the
indirect CP violation parameter, and the maximum of a suitably defined relative
violation is about . Our work implies that standard model (SM) of
particle physics violates CNR. Our LI can also be tested in other systems such
as photon polarizations.Comment: 28 page
Entangled baryons: violation of Inequalities based on local realism assuming dependence of decays on hidden variables
Bell inequalities are consequences of local realism while violated by quantum
mechanics. In particle physics, entangled high energy particles can be produced
from a common source, and the decay of each particle plays the role of
measurement. However, in a hidden variable theory, the decay could be
determined by hidden variables. This loophole killed such approaches to Bell
test in particle physics. It is a special form of measurement-setting or
free-will loophole, which also exists in other systems. Using entangled
baryons, we present new inequalities of local realism with the explicit
assumption of the dependence of the decays on hidden variables, as well as the
consideration of the statistical mixture of polarizations and the separation of
local hidden variables for objects with spacelike distances. These violations
closes the measurement-setting loophole once and for all. We propose to use the
processes and to test our inequalities, and show that their violations are
likely to be observed with the data already collected in BESIII.Comment: 11 page
Exact conditions for antiUnruh effect in (1+1)-dimensional spacetime
Exact conditions for antiUnruh effect in (1+1)-dimensional spacetime are
obtained. For detectors with Gaussian switching functions, the analytic results
are similar to previous ones, indicating that antiUnruh effect occurs when the
energy gap matches the characteristic time scale. However, this conclusion does
not hold for detectors with square wave switching functions, in which case the
condition turns out to depend on both the energy gap and the characteristic
time scale in some nontrivial way. We also show analytically that there is no
antiUnruh effect for detectors with Gaussian switching functions in
(3+1)-dimensional spacetime.Comment: 16 page
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