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3D Printing Industry

Northwestern researchers make progress towards bioink for 3D printing functional human ovaries

Researchers from Northwestern University and the Ann & Robert H. Lurie Children’s Hospital of Chicago have published a paper detailing the ongoing development of ink for 3D printing bioprosthetic ovaries.  This ink is imbued with structural proteins derived from a pig ovary. The location of these proteins has been mapped and identified in the study. […]

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Author: Anas Essop

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3D Printing Industry

Carl Deckard, the inventor of SLS, passes away

The 3D printing community has suffered a great loss as Carl Robert Deckard, the inventor of Selective Laser Sintering (SLS), sadly passed away on December 23, 2019. A pioneer within additive manufacturing holding 27 patents, Deckard, supported by Dr. Joe Beaman, developed the SLS process as a student at the University of Texas at Austin […]

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Author: Tia Vialva

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ScienceDaily

New model proposes jets go superluminal in gamma-ray bursts

Astrophysicists Jon Hakkila of the College of Charleston and Robert Nemiroff of the Michigan Technological University have published research indicating that blasts that create gamma-ray bursts may actually exceed the speed of light in surrounding gas clouds, but do so without violating Einstein’s theory of relativity. Hakkila and Nemiroff propose that such superluminal jets could create the time-reversibility seen in gamma-ray burst light curves. These proposed jets, however, do not violate the Einstein’s relativity because they only move faster than light does through the jet medium, not faster than light through vacuum.

Hakkila says that a good way to visualize this superluminal motion is to imagine someone on one side of a pond skipping a stone across the water in your direction. The frequently-hopping stone moves through the air between hops faster than the waves it generates move through water. Hakkila says you would see waves created by each skip of the approaching stone in reverse order, with waves from the most recent skip arriving first and those from the initial skip arriving last. This superluminal blast explanation retains many characteristics of accepted gamma-ray burst jet models, Hakkila says. Nemiroff adds, however, that their proposed scenario involves Cherenkov radiation, a type of light created by superluminal motion that was not previously thought to be important in generating the light curves of gamma-ray bursts.

“Standard gamma-ray burst models have neglected time-reversible light curve properties,” Hakkila says. “Superluminal jet motion accounts for these properties while retaining a great many standard model features.”

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Materials provided by Michigan Technological University. Note: Content may be edited for style and length.


Journal Reference:

  1. Jon Hakkila, Robert Nemiroff. Time-reversed Gamma-Ray Burst Light-curve Characteristics as Transitions between Subluminal and Superluminal Motion. The Astrophysical Journal, 2019; 883 (1): 70 DOI: 10.3847/1538-4357/ab3bdf

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Michigan Technological University. “New model proposes jets go superluminal in gamma-ray bursts.” ScienceDaily. ScienceDaily, 24 September 2019. .

Michigan Technological University. (2019, September 24). New model proposes jets go superluminal in gamma-ray bursts. ScienceDaily. Retrieved September 24, 2019 from www.sciencedaily.com/releases/2019/09/190924152835.htm

Michigan Technological University. “New model proposes jets go superluminal in gamma-ray bursts.” ScienceDaily. www.sciencedaily.com/releases/2019/09/190924152835.htm (accessed September 24, 2019).

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Hackster.io

Snap (Simulated) Twig, Scare Bear

Robert Werner lives in Alaska, where bears are quite common. While beautiful creatures, they can obviously be quite dangerous, and as an alternative to more “active” approaches for bear defense involving spray or firearms, Werner came up with a simple “Bear Troller,” which instead plays the sound of a snapping twig.

The idea here is that the sound of a twig snapping will cause a bear to immediately stop and pay attention to the noise source, as it’s something that both a predator and prey would make. Others try bear bells for this purpose with debatable effect, though to be fair, it doesn’t seem like this one has been tested in a bear encounter scenario.

The Bear Troller hangs on a lanyard inside of a 3D-printed enclosure. Power is provided by a 600 mAh battery, with a TP4056 charging board, and a solar panel to provide power when needed for a long hike. As seen below, the device is triggered by a button with a bear-shaped top, which triggers a DFPlayer MP3 module. This board conveniently includes an SD card slot and amplifier to emit the needed sound over a speaker.

This concept could, of course, be used for a variety of different purposes, though if you do plan on encountering a bear, it’s probably a good idea to have a backup plan as well!

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Author: Jeremy S. Cook

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3D Printing Industry

Additive Orthopedics supplies first 3D printed finger implant in the U.S.

Robert Smith, an iron worker from St. Petersburg, Florida, has become the first person to receive a 3D printed finger bone implant in the U.S. Dr. Daniel Penello from Alexander Orthopedic Associates and a team from Additive Orthopedics, a New Jersey-based medical technology company, worked to create the custom 3D printed bone replacement. The alternative for Smith’s […]

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Author: Tia Vialva