DEVELOPING: There is currently a large police presence at Methodist Dallas Medical Center
Officers responded to the hospital on 1400 block of North Beckley Avenue before noon on Saturday.An event to give dozens of breast cancer survivors a look at the new Linda and Mitch Hart Breast Cancer Center has been canceled.
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Femtosecond laser micromachining for stress-based figure correction of thin mirrorsThe fabrication of a large number of high-resolution thin-shell mirrors for future space telescopes remains challenging, especially for revolutionary mission concepts such as NASA’s Lynx X-ray Surveyor. It is generally harder to fabricate thin mirrors to the exact shape than thicker ones, and the coatings deposited onto mirror surfaces to increase the reflectivity typically have high intrinsic stress that deforms the mirrors further. Since the rapid development of femtosecond laser technologies over the last few decades has triggered wide applications in materials processing, we have developed a mirror figure correction and stress compensation method using a femtosecond laser micromachining technique for stress-based surface shaping of thin-shell x-ray optics. We employ a femtosecond laser to selectively remove regions of a stressed film that is grown onto the back surface of the mirror, to modify the stress states of the mirror. In this paper, we present experimental results to create both isotropic and anisotropic stress states on thin flat silicon mirrors with thermal oxide (SiO2) films using femtosecond lasers. We show that equibiaxial stress can be generated through uniformly micromachined holes, while non-equibiaxial stress arises from the ablation of equally spaced troughs. We also present results from strength tests to show how this process minimally affects the strength of mirrors. These developments are beneficial to the high-throughput correction of thin-shell mirrors for future space-based x-ray telescopes.
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Grant Union High School shooting turns into homicide investigationA large police presence could be seen at Grant during a football game against Monterey Trail.
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The Man Who Allegedly Shot And Killed A 21-Year-Old Woman Who Beat Him At A Basketball Game Has Been ArrestedCameron Hogg was taken into custody on Thursday morning and charged with murder, Dallas police said.
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Dallas police investigating shooting in UptownDallas police are investigating a shooting they believe happened in Uptown early Friday morning.
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DFW schools give out kits to collect student DNA - KRLD All LocalPlus, Dallas man facing federal charges for 2015 murder and scooters will be returning to Dallas
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West Dallas shingle plant says it reduced emissions; residents say it’s not enoughThe owner of a West Dallas shingle plant at the center of years of scrutiny over air pollution said Thursday it has lowered its emissions of sulfur dioxide by...
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