19,880 research outputs found
Coexistence of full which-path information and interference in Wheelers delayed choice experiment with photons
We present a computer simulation model that is a one-to-one copy of an
experimental realization of Wheeler's delayed choice experiment that employs a
single photon source and a Mach-Zehnder interferometer composed of a 50/50
input beam splitter and a variable output beam splitter with adjustable
reflection coefficient (V. Jacques {\sl et al.}, Phys. Rev. Lett. 100,
220402 (2008)). For , experimentally measured values of the
interference visibility and the path distinguishability , a parameter
quantifying the which-path information WPI, are found to fulfill the
complementary relation , thereby allowing to obtain partial WPI
while keeping interference with limited visibility. The simulation model that
is solely based on experimental facts, that satisfies Einstein's criterion of
local causality and that does not rely on any concept of quantum theory or of
probability theory, reproduces quantitatively the averages calculated from
quantum theory. Our results prove that it is possible to give a particle-only
description of the experiment, that one can have full WPI even if D=0, V=1 and
therefore that the relation cannot be regarded as quantifying
the notion of complementarity.Comment: Physica E, in press; see also http://www.compphys.ne
Production of , , and in hadronic decays
A coherent study of the production of (, 2, 3 corresponding to
, , and ) in is
reported based on a previously proposed glueball and nonet mixing
scheme, and a factorization for the decay of , where
denotes the isoscalar vector mesons and , and denotes
pseudoscalar mesons. The results show that the decays are very
sensitive to the structure of those scalar mesons, and suggest a glueball in
the GeV region, in line with Lattice QCD. The presence of significant
glueball mixings in the scalar wavefunctions produces peculiar patterns in the
branching ratios for , which are in good agreement
with the recently published experimental data from the BES collaboration.Comment: Version accepted by PRD; Numerical results in Tab IV and VI changed
due to correction of an error in quoting an experimental datum; Conclusion is
not change
Simultaneous temperature and refractive index measurements using a 3°slanted multimode fiber Bragg grating
Author name used in this publication: M. S. DemokanAuthor name used in this publication: W. Jin2005-2006 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
Argon annealing of the oxygen-isotope exchanged manganite La_{0.8}Ca_{0.2}MnO_{3+y}
We have resolved a controversial issue concerning the oxygen-isotope shift of
the ferromagnetic transition temperature T_{C} in the manganite
La_{0.8}Ca_{0.2}MnO_{3+y}. We show that the giant oxygen-isotope shift of T_C
observed in the normal oxygen-isotope exchanged samples is indeed intrinsic,
while a much smaller shift observed in the argon annealed samples is an
artifact. The argon annealing causes the 18O sample to partially exchange back
to the 16O isotope due to a small 16O contamination in the Ar gas. Such a
contamination is commonly caused by the oxygen outgas that is trapped in the
tubes, connectors and valves. The present results thus umambiguously
demonstrate that the observed large oxygen isotope effect is an intrinsic
property of manganites, and places an important constraint on the basic physics
of these materials.Comment: 4 pages, 3 figures, submitted to PR
DiffULD: Diffusive Universal Lesion Detection
Universal Lesion Detection (ULD) in computed tomography (CT) plays an
essential role in computer-aided diagnosis. Promising ULD results have been
reported by anchor-based detection designs, but they have inherent drawbacks
due to the use of anchors: i) Insufficient training targets and ii)
Difficulties in anchor design. Diffusion probability models (DPM) have
demonstrated outstanding capabilities in many vision tasks. Many DPM-based
approaches achieve great success in natural image object detection without
using anchors. But they are still ineffective for ULD due to the insufficient
training targets. In this paper, we propose a novel ULD method, DiffULD, which
utilizes DPM for lesion detection. To tackle the negative effect triggered by
insufficient targets, we introduce a novel center-aligned bounding box padding
strategy that provides additional high-quality training targets yet avoids
significant performance deterioration. DiffULD is inherently advanced in
locating lesions with diverse sizes and shapes since it can predict with
arbitrary boxes. Experiments on the benchmark dataset DeepLesion show the
superiority of DiffULD when compared to state-of-the-art ULD approaches
Temperature-insensitive interferometer using a highly birefringent photonic crystal fiber loop mirror
Author name used in this publication: M. S. Demokan2004-2005 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
Fusion splicing photonic crystal fibers and conventional single-mode fibers : microhole collapse effect
Author name used in this publication: M. S. Demokan2007-2008 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
Strain and temperature characteristics of a long-period grating written in a photonic crystal fiber and its application as a temperature-insensitive strain sensor
Author name used in this publication: M. S. Demokan2007-2008 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
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