302 research outputs found
Lini0.5mn1.5o4 spinel cathode using room temperature ionic liquid as electrolyte
In this study, LiNi0.5Mn1.5O4 (LNMO) nanoparticles were prepared as a 5 V cathode material via a rheological phase method and annealed at different temperatures: 680 ◦C, 750 ◦C, and 820 ◦C. The sample annealed at 750 ◦C shows the best performance. A room temperature ionic liquid (RTIL) containing 1 M lithium bis(trifluoromethanesulfonyl) imide (LiNTf2) in N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl) imide (C4mpyrNTf2) was used as novel electrolyte in conjunction with the LNMO cathodes and their electrochemical properties have been investigated. The results show that the LNMO using RTIL as electrolyte has better coulombic efficiency and comparable discharge capacities to those of the cells assembled with standard liquid electrolyte (1 M LiPF6 in ethylene carbonate/diethyl carbonate). Electrochemical impedance spectroscopy shows that the RTIL is much more stable as the electrolyte for LiNi0.5Mn1.5O4 than the conventional electrolyte
Analysis of Predictors for Lymph Node Metastasis in Patients with Superficial Esophageal Carcinoma
In order to predict related risk factors for lymph node metastasis (LNM) in patients with superficial esophageal carcinoma (SEC) and provide reference for endoscopic minimally invasive treatment, we included a total of 93 patients with superficial esophageal carcinoma who have underwent esophagectomy and lymph node dissection from 2010 to 2015. The depth of invasion was remeasured and classified into 6 groups according to their wall penetration. The prediction model was founded based on the independent risk factors. The results shows that lymph node metastasis of m1, m2, m3, sm1, sm2, and sm3 of superficial esophageal carcinoma was 0%, 0%, 5.3%, 8.7%, 17.6%, and 37.5%, respectively. The tumor size, differentiation, and lymphvascular invasion were also significantly related to lymph node metastasis by univariate analysis. Multivariate analysis showed that the depth of invasion and lymphovascular invasion were independent risk factors of lymph node metastasis. A prediction model for lymph node metastasis was established as follows: p=ex/(1+ex), and x = −5.469 + 0.839 × depth of invasion + 1.992 × lymphavascular metastasis. The area under ROC curve was 0.858 (95% CI: 0.757–0.959). It was also shown that the depth of invasion was related to tumor differentiation, macroscopic type, and tumor size
An integrated neuroimaging-omics approach for the gut-brain communication pathways in Alzheimer’s disease
A key role of the gut microbiota in the pathogenesis of neurodegenerative diseases, such as Alzheimer’s disease (AD), has been identified over the past decades. Increasing clinical and preclinical evidence implicates that there is bidirectional communication between the gut microbiota and the central nervous system (CNS), which is also known as the microbiota-gut-brain axis. Nevertheless, current knowledge on the interplay between gut microbiota and the brain remains largely unclear. One of the primary mediating factors by which the gut microbiota interacts with the host is peripheral metabolites, including blood or gut-derived metabolites. However, mechanistic knowledge about the effect of the microbiome and metabolome signaling on the brain is limited. Neuroimaging techniques, such as multi-modal magnetic resonance imaging (MRI), and fluorodeoxyglucose-positron emission tomography (FDG-PET), have the potential to directly elucidate brain structural and functional changes corresponding with alterations of the gut microbiota and peripheral metabolites in vivo. Employing a combination of gut microbiota, metabolome, and advanced neuroimaging techniques provides a future perspective in illustrating the microbiota-gut-brain pathway and further unveiling potential therapeutic targets for AD treatments
Measurement of the cross section of at center-of-mass energies between 3.510 and 4.843 GeV
Using collision data corresponding to a total integrated luminosity
of 12.9 collected with the BESIII detector at the BEPCII collider,
the exclusive Born cross sections and the effective form factors of the
reaction are measured via the single
baryon-tag method at 23 center-of-mass energies between 3.510 and 4.843 GeV.
Evidence for the decay is observed
with a significance of 4.5 by analyzing the measured cross sections
together with earlier BESIII results. For the other charmonium(-like) states
, , , , , and ,
no significant signal of their decay to is found. For these
states, upper limits of the products of the branching fraction and the
electronic partial width at the 90% confidence level are provided.Comment: 18 pages, 10 pages, 4 table
First Observation of a Three-Resonance Structure in {non-open} Charm Hadrons
We report the measurement of the cross sections for
{nOCH} (nOCH stands for non-open charm hadrons) with
improved precision at center-of-mass energies from 3.645 to 3.871 GeV. We
observe for the first time a three-resonance structure in the energy-dependent
lineshape of the cross sections, which are , and with significances of ,
, and , respectively. The is observed
for the first time. We found two solutions in analysis of the cross sections.
For solution I [solution II], we measure the mass, the total width and the
product of electronic width and nOCH decay branching fraction to be [] MeV/, [] MeV, and [] eV for the , respectively. In addition, we
measure the branching fractions {nOCH} for the first time, and {nOCH}. Moreover, we determine the open-charm (OC) branching fraction
{OC}, which supports the interpretation of as an OC pair molecular state, but contained a simple four-quark state
component. The first uncertainties are from fits to the cross sections, and the
second are systematic
Amplitude analysis and branching fraction measurement of the decay
Using 2.93 of collision data collected with the
BESIII detector at the center-of-mass energy 3.773\,GeV, we perform the first
amplitude analysis of the decay and determine the
relative magnitudes and phases of different intermediate processes. The
absolute branching fraction of is measured to be
. The dominant intermediate
processes are and , with branching fractions of and , respectively
Study of the doubly Cabibbo-suppressed decays and
Based on 7.33 fb of collision data collected at
center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector,
the experimental studies of the doubly Cabibbo-suppressed decays and are reported. We determine the
absolute branching fraction of to be
() . No
significant signal of is observed and the upper
limit on its decay branching fraction at 90\% confidence level is set to be
.Comment: 10 pages, 4 figures, 4 table
Search for a scalar partner of the via decays into and
Using a data sample corresponding to an integrated luminosity of 2.93
fb collected at a center-of-mass energy of 3.773~GeV with the BESIII
detector at the BEPCII collider, we search for a scalar partner of the
, denoted as , via and
processes. No significant signals are observed and
the upper limits of the product branching fractions and
are determined at the 90\% confidence level, for the narrow with a
mass ranging from 3710 to 3740 MeV/, which are from 0.8 to 1.8 and 0.9 to 3.4 , respectively
Measurement of branching fractions of decays to , and
Based on 4.5 fb data taken at seven center-of-mass energies ranging
from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we
measure the branching fractions of
relative to
. Combining with the world
average branching fraction of , their branching fractions are measured to be
for , for
,
for
and
for
(non-). In all the above
results, the first uncertainties are statistical, the second are systematic and
the third are from external input of the branching fraction of
. Since no signal for
is observed, the
upper limit of its branching fraction is determined to be 0.11\% at the 90
confidence level
Observation of the Singly Cabibbo-Suppressed Decay
The singly Cabibbo-suppressed decay is observed for the first time with a statistical
significance of by using 4.5 fb of collision data
collected at center-of-mass energies between 4.600 and 4.699 GeV with the
BESIII detector at BEPCII. The absolute branching fraction of
is measured to be in a model-independent approach. This is
the first observation of a Cabibbo-suppressed decay involving
in the final state. The ratio of branching fractions between
and the Cabibbo-favored decay
is calculated to be , where with the
Cabibbo mixing angle. This ratio significantly deviates from and
provides important information for the understanding of nonfactorization
contributions in decays.Comment: 8 pages, 2 figure
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