4,629 research outputs found
PLANTAR FOOT PRESSURE ANALYSIS FOR XING HUINA -THE WOMEN 10000 METER CHAMPION IN ATHENS OLYMPICS
In the middle-distance race, the running technology of the Athlete plays an important role in the foot pressure distributions. On the side, the movement of the foot pressure also affects the running technology. The two aspects are closely related and interact with each other. In the study of the middle-distance race, the plantar foot pressure analysis has a significant impact on the prevention of the sport injuries and orthopedics
Spatial performance of skewed continuous rigid-frame bridges based on finite element analysis
Continuous rigid-frame bridges are usually symmetrically designed along the bridge center line for simplicity and clarity purposes. However, the skewed bridges are necessary in case of complex intersections with space constraint in highways. Previous research mainly focuses on the discussion of skewed angle and the interaction between girders and cross frames on I shape section. Box sections are also used for skewed bridge due to large torsion stiffness, which have many problems during service time. This paper analyzed coupled skew and bending effect for the bridge which combines the continuous rigid-frame system and skewed system. For skewed bridges, significant out-of-lane effect occurs in bridges, which is hard to be predicted through linear analysis. For continuous bridges, at the interior supports, negative bending moments exist. In addition, a part of each diaphragm of the bridge is connected to the main girder, and the rest part only carries its self-weight, which makes the girder behavior more complex in the transverse direction. Therefore, the spatial performance of the bridge is very complex. The design cannot only use simple two dimension analysis. In the paper the three dimensional finite element analysis was conducted to find the effect due to dead load, live load, temperature, and brake force to find critical position for monitoring and maintainance. Primary bending normal stress, warping normal stress, coefficient of shearing force lag and stress distribution of consolidation pier were analyzed and output. The behavior of both superstructure and sub structure were investigated. The effect of coupled bending and torsion is significant to the behavior of the bridge. Finally the design recommendations about the skew bridge are given. The critical positions for the further test and monitoring are found
Scaling of Dzyaloshinskii Moriya interaction at heavy metal and ferromagnetic metal interfaces
The Dzyaloshinskii Moriya Interaction (DMI) at the heavy metal (HM) and
ferromagnetic metal (FM) interface has been recognized as a key ingredient in
spintronic applications. Here we investigate the chemical trend of DMI on the
5d band filling (5d^3~5d^10) of the HM element in HM/CoFeB/MgO multilayer thin
films. DMI is quantitatively evaluated by measuring asymmetric spin wave
dispersion using Brillouin light scattering. Sign reversal and 20 times
modification of the DMI coefficient D have been measured as the 5d HM element
is varied. The chemical trend can be qualitatively understood by considering
the 5d and 3d bands alignment at the HM/FM interface and the subsequent orbital
hybridization around the Fermi level. Furthermore, a positive correlation is
observed between DMI and spin mixing conductance at the HM/FM interfaces. Our
results provide new insights into the interfacial DMI for designing future
spintronic devices
1-[2-(3,5-Difluorobenzyloxy)phenyl]ethanone
In the title compound, C15H12F2O2, the dihedral angle between the aromatic rings is 70.43 (4)°. The crystal packing exhibits no significantly short intermolecular contacts
Multi-wavelength Stellar Polarimetry of the Filamentary Cloud IC5146: I. Dust Properties
We present optical and near-infrared stellar polarization observations toward
the dark filamentary clouds associated with IC5146. The data allow us to
investigate the dust properties (this paper) and the magnetic field structure
(Paper II). A total of 2022 background stars were detected in -, -,
-, and/or -bands to mag. The ratio of the polarization
percentage at different wavelengths provides an estimate of ,
the wavelength of peak polarization, which is an indicator of the small-size
cutoff of the grain size distribution. The grain size distribution seems to
significantly change at 3 mag, where both the average and dispersion
of decrease. In addition, we found
0.6-0.9 m for mag, which is larger than the 0.55 m
in the general ISM, suggesting that grain growth has already started in low
regions. Our data also reveal that polarization efficiency (PE ) decreases with as a power-law in -, -, and
-bands with indices of -0.710.10, -1.230.10 and -0.530.09.
However, -band data show a power index change; the PE varies with
steeply (index of -0.950.30) when mag but softly
(index of -0.250.06) for greater values. The soft decay of PE in
high regions is consistent with the Radiative Aligned Torque model,
suggesting that our data trace the magnetic field to mag.
Furthermore, the breakpoint found in -band is similar to the where we
found the dispersion significantly decreased. Therefore, the
flat PE- in high regions implies that the power index changes result
from additional grain growth.Comment: 31 pages, 17 figures, and 3 tables; accepted for publication in Ap
Winding Clearness for Differentiable Point Cloud Optimization
We propose to explore the properties of raw point clouds through the
\emph{winding clearness}, a concept we first introduce for assessing the
clarity of the interior/exterior relationships represented by the winding
number field of the point cloud. In geometric modeling, the winding number is a
powerful tool for distinguishing the interior and exterior of a given surface
, and it has been previously used for point normal orientation
and surface reconstruction. In this work, we introduce a novel approach to
assess and optimize the quality of point clouds based on the winding clearness.
We observe that point clouds with reduced noise tend to exhibit improved
winding clearness. Accordingly, we propose an objective function that
quantifies the error in winding clearness, solely utilizing the positions of
the point clouds. Moreover, we demonstrate that the winding clearness error is
differentiable and can serve as a loss function in optimization-based and
learning-based point cloud processing. In the optimization-based method, the
loss function is directly back-propagated to update the point positions,
resulting in an overall improvement of the point cloud. In the learning-based
method, we incorporate the winding clearness as a geometric constraint in the
diffusion-based 3D generative model. Experimental results demonstrate the
effectiveness of optimizing the winding clearness in enhancing the quality of
the point clouds. Our method exhibits superior performance in handling noisy
point clouds with thin structures, highlighting the benefits of the global
perspective enabled by the winding number
Wavelength-multiplexed duplex transceiver based on III-V/Si hybrid integration for off-chip and on-chip optical interconnects
A six-channel wavelength-division-multiplexed optical transceiver with a compact footprint of 1.5 x 0.65 mm(2) for off-chip and on-chip interconnects is demonstrated on a single silicon-on-insulator chip. An arrayed waveguide grating is used as the (de)multiplexer, and III-V electroabsorption sections fabricated by hybrid integration technology are used as both modulators and detectors, which also enable duplex links. The 30-Gb/s capacity for each of the six wavelength channels for the off-chip transceiver is demonstrated. For the on-chip interconnect, an electrical-to-electrical 3-dB bandwidth of 13 GHz and a data rate of 30 Gb/s per wavelength are achieved
Diisopropyl pyrazine-2,5-dicarboxylate
The molecule of the title compound, C12H16N2O4, is located on an inversion center. The carboxylate groups are twisted slightly with respect to the pyrazine ring, making a dihedral angle of 6.4 (3)°
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