671 research outputs found
Decay Constants of Pseudoscalar -mesons in Lattice QCD with Domain-Wall Fermion
We present the first study of the masses and decay constants of the
pseudoscalar mesons in two flavors lattice QCD with domain-wall fermion.
The gauge ensembles are generated on the lattice with the
extent in the fifth dimension, and the plaquette gauge action at , for three sea-quark masses with corresponding pion masses in
the range MeV. We compute the point-to-point quark propagators, and
measure the time-correlation functions of the pseudoscalar and vector mesons.
The inverse lattice spacing is determined by the Wilson flow, while the strange
and the charm quark masses by the masses of the vector mesons
and respectively. Using heavy meson chiral perturbation theory
(HMChPT) to extrapolate to the physical pion mass, we obtain MeV and MeV.Comment: 15 pages, 3 figures. v2: the statistics of ensemble (A) with m_sea =
0.005 has been increased, more details on the systematic error, to appear in
Phys. Lett.
The Impact of IT Governance on Organizational Performance
IT governance, as a subset of corporate governance, consists of organizational structures and processes that ensure theorganization’s IT can sustain and extend the organization’s strategies and objectives. In previous research, different types ofIT governance have been proposed. However, it is not clear how different governance types affect firm performance andwhat are the theories underlying the causal relationships. Drawing from strategic alignment and coordination theories, aresearch model is proposed for investigating how intra-organizational coordination could help build goal congruence throughstrategic alignment and hence achieve higher organizational performance. The purpose of this research is to examine therelationship between IT governance, strategic alignment, and organizational performance. Data collected from 167Taiwanese firms were used to empirically evaluate the theoretical relationships proposed in the research model, and theresults show that strategic alignment is a major factor that mediates the effect of IT governance on firm performance
Emergence of topological phases from the extension of two-dimensional lattice with nonsymmorphic symmetries
Young and Kane have given a great insight for 2D Dirac semimetals with
nontrivial topology in the presence of nonsymmorphic crystalline symmetry.
Based on one of 2D nonsymmorphic square lattice structures they proposed, we
further construct a set of 3D minimal tight-binding models via vertically
stacking the 2D nonsymmorphic lattice. Specifically, our model provides a
platform to generate three topologically semimetallic phases such as Dirac
nodal line semimetals, Weyl nodal line semimetals and Weyl semimetals. The
off-centered mirror symmetry sufficiently protects nodal lines emerging within
mirror-invariant plane with a nontrivial mirror invariant ,
whereas twofold screw rotational symmetry protects nontrivial Weyl nodal points
with topological charge . Interestingly, Weyl nodal loops are generated
without mirror symmetry protection, where nontrivial "drumhead" surface states
emerge within loops. In the presence of both time-reversal and inversion
symmetries, the emergence of weak topological insulator phases is discussed as
well.Comment: 8 pages, 6 figures and 1 tabl
3D-PL: Domain Adaptive Depth Estimation with 3D-aware Pseudo-Labeling
For monocular depth estimation, acquiring ground truths for real data is not
easy, and thus domain adaptation methods are commonly adopted using the
supervised synthetic data. However, this may still incur a large domain gap due
to the lack of supervision from the real data. In this paper, we develop a
domain adaptation framework via generating reliable pseudo ground truths of
depth from real data to provide direct supervisions. Specifically, we propose
two mechanisms for pseudo-labeling: 1) 2D-based pseudo-labels via measuring the
consistency of depth predictions when images are with the same content but
different styles; 2) 3D-aware pseudo-labels via a point cloud completion
network that learns to complete the depth values in the 3D space, thus
providing more structural information in a scene to refine and generate more
reliable pseudo-labels. In experiments, we show that our pseudo-labeling
methods improve depth estimation in various settings, including the usage of
stereo pairs during training. Furthermore, the proposed method performs
favorably against several state-of-the-art unsupervised domain adaptation
approaches in real-world datasets.Comment: Accepted in ECCV 2022. Project page:
https://ccc870206.github.io/3D-PL
MUSCLE ACTIVATION AND THREE-DIMENSIONAL KINEMATICS OF UPPER EXTREMITY IN SNATCH WEIGHT LIFTING
INTRODUCTION: Previously, there was little weightlifting research focused on biomechanics of the elbow and the shoulder joints (Bartonietz, 1996). Therefore, the purposes of this study were to evaluate the kinematics of upper extremity on sagittal plane during 1st pull, transition from the 1st to the 2nd pull, 2nd pull, turnover under the barbell, catch phase, and rising from the squat position phases of snatch weight lifting and to examine upper-limb muscles activity during snatch weight lifting. The EMG signals were analyzed using the normalized linear envelopes
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