864 research outputs found
Dirac Bilayer Metasurfaces as an Inverse Gires-Tournois Etalon
Efficient transmissive pure-phase resonances are highly desirable for optical
modulation and wavefront engineering. Here, we propose a novel principle to
realize a pure-phase resonance in an extremely broad transmission band, as
opposed to previous approaches restricted to operating in reflection mode or
over a narrow spectral band. We show that a glide-symmetric bilayer metasurface
mathematically mimicking a two-dimensional Dirac semimetal induces
unidirectional guided-mode excitation and perfect leakage-radiation blazing at
the transmission channel. These effects create a peculiar resonant-scattering
configuration, similar to the classical reflective Gires-Tournois etalon, but
in transmission, providing full 2pi phase modulation with constant
transmittance near 100%. Most importantly, this effect persists over an
extremely wide band, associated with topological effects. Hence, our proposed
approach produces a spectrally and parametrically robust pure-phase resonance
effect in transmission, which is highly beneficial for practical applications.Comment: 11 pages, 5 figure
Leukoaraiosis is associated with pneumonia after acute ischemic stroke
Diagnostic criteria for stroke associated pneumonia based on the CDC criteria. (DOCX 25 kb
AN ANALYSIS OF 500 M INLINE SKATE STARTING MOTIONS
The purpose of this study was to examine if there are kinematical variables differences between national representative players (NRP) and non national representative players (NNRP) during 500 m inline skate starting motion. Four NRP and six NNRP were recruited for the study. Each subject executed starting motion five times on a 2x12 m
start way in a gymnasium. Kinematical variables were analyzed by the three-dimensional motion analysis system (60Hz). It was hypothesized that there are time and center of
mass acceleration differences in starting phase between groups since starting phase has been considered important in sprinting. The results showed that the NRP had significantly
shorter starting phase time than that of NNRP
The Effect of Target Height on the Trunk, Pelvis, and Thigh Kinematics in the Taekwondo Roundhouse Kick
Clinical significance of D-dimer levels during acute period in ischemic stroke
Background
Initial D-dimer level is a well-known prognostic parameter in patients with acute ischemic stroke (AIS). However, there have been no studies on the clinical significance of follow-up D-dimer levels. In this study, we evaluated the association between initial and follow-up D-dimer levels and early neurological deterioration (END) in patients with AIS.
Methods
We included consecutive patients with AIS who had a positive initial D-dimer test (> 0.55mg/L) between March 2021 and November 2022. The follow-up D-dimer test was performed on the 7th day after hospitalization and on the day of discharge if discharged earlier. END was defined as an increase of ≥ 2 in the total NIHSS score, or ≥ 1 in the motor NIHSS score within the first 7 days of admission. As medical conditions closely associated with the initial and follow-up D-dimer levels in AIS patients, we also evaluated the history of cancer, active cancer, and venous thromboembolism (VTE) that occurred during hospitalization together.
Results
A total of 246 patients with AIS were evaluated (median age: 87 years, male: 56.5%). In multivariable logistic regression analysis, the initial D-dimer level was closely associated with END after adjusting for confounders (adjusted odds ratio [aOR]: 1.48, 95% CI: 1.06–2.05). The follow-up D-dimer level also showed a close correlation with END (aOR: 1.60, 95% CI: 1.16–2.20). Regarding the analysis of the association between D-dimer levels and underlying cancer or VTE, the initial D-dimer level showed a statistically significant positive relationship only with active cancer (P = 0.024). On the other hand, the follow-up D-dimer level was found to be statistically significantly associated with a history of cancer (P = 0.024), active cancer (P = 0.001), and VTE (P = 0.001).
Conclusions Initial and follow-up D-dimer levels were associated with END in AIS patients. Particularly, the follow-up D-dimer level showed a clear correlation not only with END but also with the underlying cancer or the occurrence of VTE during the acute period
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