Selective Laser Sintering - Sls Stereo Light Curing Molding - Sla
It mainly uses photosensitive resin as a raw material, and utilizes the characteristic that liquid photosensitive resin will cure quickly under ultraviolet laser beam irradiation. The photosensitive resin is generally liquid, and it immediately initiates a polymerization reaction and completes curing when irradiated with a certain wavelength of ultraviolet light (250 nm to 400 nm). SLA focuses on the surface of the light-curing material by focusing ultraviolet light of a specific wavelength and intensity to solidify it sequentially from point to line and from line to surface, thereby completing the drawing of a layered cross-section.
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3-11 Alarm fire in Chicago 7-1-13 (more)
On July 1, 2013, a significant fire broke out in Chicago, prompting a 3-11 alarm response. As someone who was present, I can share some insights into how things unfolded. Initially, firefighters focused on controlling the blaze using master streams. However, after a considerable amount of time, it was decided to halt these efforts and allow the fire to burn through the roof area to create better access points. This decision led to some dramatic moments captured in photographs, including the unexpected collapse of a previously added truss system. Unfortunately, I missed capturing that particular moment, but eagle-eyed observers might notice the stark contrast between pre-collapse and post-collapse shots.
At this stage, a reserve snorkel unit was dispatched to assist, which always makes for an interesting photographic opportunity. A second 3-11 request was issued due to the lack of available units in staging, though I’m not sure if those resources were ultimately utilized. I managed to take another panoramic shot, and fellow photographer Denny McGuire noted something unique about the scene: seeing two snorkels and two tower ladders (both heavy-duty equipment) operating simultaneously is quite rare. Shortly afterward, I decided to leave the scene. On my way out, I had a clear view of Engine 1 arriving at its new station at Eng 16's former location on 53 E Pershing Road. It was quite a sight, but I didn’t get any photos of it.
Here are some images I did manage to capture during the incident. Each one tells part of the story of that chaotic yet fascinating day. More photos from this fire can be viewed [here](insert link). I hope you find them intriguing!
[Image captions follow below, showing various angles of the fire and rescue operations.]