5 research outputs found
Characteristics of Step-Shaped Laser-Driven Flyers on Fiber End Face Based on a Ti/Al Ablation Layer
Laser-driven flyers (LDF), which can launch the flyer on the interaction
of a laser pulse with a thin film of metal, have been widely used
in many fields, such as ignition, space scrap metal science, and dynamic
high-pressure physics. However, at present, further development of
LDF is being hindered by the high reflectivity of the ablation layer
and low energy utilization efficiency of LDF on the fiber end face.
Herein, improved LDFs were designed and fabricated by mask plate and
magnetron sputtering. Improved LDF incorporates a Ti/Al composite
film as the ablation layer, while the flyer layer features a smaller
diameter round platform design. Reflectivity of samples under static
and dynamic conditions and driving characteristics of samples were
tested using an optical isolator and photonic doppler velocimetry
system. The velocity of the improved LDFs reaches 1.7 km/s with a
peak acceleration of 8.7 × 1010 m/s2. LDF
with a Ti/Al composite film as the ablation layer demonstrates a static
absorption rate of 59%, which gradually increases to 65% under laser
irradiation. This absorption rate is notably higher compared with
the static absorption rate (20%) and the peak absorption rate under
laser irradiation (40%) of an Al layer. Consequently, there is a substantial
improvement of about 35% in the flyer velocity. In contrast to the
plane-shaped LDF, the velocity profile of the flyer and impact crater
morphology suggest that the step-shaped LDF offers a 15% improvement
in velocity and a 50% increase in acceleration, with better flyer
integrity observed
Quantitative Values of Serum β-hCG and Ang-2 After Medical Abortion.
<p>The box indicates the lower and upper quartiles and the central line marks the median. The points at the end of the whiskers represent the range of the values.</p
Serum β-hCG and Ang-2 Levels After Medical Abortion.
<p>Data are given in median and interquartile range (IQR).</p
Accuracy of the Biomarkers in Diagnosing PUB on Day 14 After Medical Abortion.
<p>Accuracy of the Biomarkers in Diagnosing PUB on Day 14 After Medical Abortion.</p
Baseline Characteristics of Women Underwent Medical Abortion.
<p>BMI: Body mass index;</p>*<p>Data are given in median and interquartile range (IQR).</p