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Blog – Page 9069

Inserting air into hot glass to form a bubble has been used to make glass objects since Roman times. In new work, researchers apply these same glass blowing principles on a microscopic scale to make specialized miniature cone-shaped lenses known as axicons.

Axicons are used to shape in a way that is beneficial for optical drilling, imaging and creating for manipulating particles or cells. These lenses have been known for more than 60 years, but their fabrication, especially when small, is not easy.

“Our technique has the potential of producing robust miniature axicons in glass at a low cost, which could be used in miniaturized imaging systems for biomedical imaging applications, such as , or OCT,” said research team member Nicolas Passilly from FEMTO-ST Institute in France.

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In conventional imaging methods, a beam of photons (or other particles) is reflected off the object to be imaged. After the beam travels to a detector, the information gathered there is used to create a photograph or other type of image. In an alternative imaging technique called “ghost imaging,” the process works a little differently: an image is reconstructed from information that is detected from a beam that never actually interacts with the object.

The key to is to use two or more correlated beams of particles. While one interacts with the object, the second beam is detected and used to reconstruct the image, even though the second beam never interacts with the object. The only aspect of the first beam that is detected is the arrival time of each photon on a separate detector. But because the two beams are correlated, the image of the object can be fully reconstructed.

While two beams are usually used in ghost imaging, recent research has demonstrated higher-order correlations—that is, correlations among three, four, or five beams. Higher-order ghost imaging can lead to improvements in image visibility, but it comes with the drawback that higher-order correlated events have a lower probability of detection, which causes lower resolution.

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In the past 10 days, officials have recorded nearly 100 new cases of Ebola in the ongoing outbreak in the Democratic Republic of the Congo (DRC), a sign of fluctuating transmission throughout North Kivu and Ituri provinces, the World Health Organization (WHO) said in an update.

Today, the DRC will likely confirm another 18 new cases, which will raise the outbreak total to 2,265. As of yesterday, there were 1,510 deaths, and 269 suspected cases are still being investigated.

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A secretive startup has been awarded a launch contract for the U.S. military using a rather novel launch system – based on kinetic energy technology that would essentially shoot satellites directly into space using a hypersonic vehicle.

Last week on Wednesday, June 19, California-based company SpinLaunch announced they had secured a launch contract with the U.S. Department of Defense (DOD). They didn’t release any further details, other than noting it was a “responsive launch prototype contract… for kinetic energy-based launch services.”

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Rutgers computer scientists used artificial intelligence to control a robotic arm that provides a more efficient way to pack boxes, saving businesses time and money.

“We can achieve low-cost, automated solutions that are easily deployable. The key is to make minimal but effective hardware choices and focus on robust algorithms and software,” said the study’s senior author Kostas Bekris, an associate professor in the Department of Computer Science in the School of Arts and Sciences at Rutgers University-New Brunswick.

Bekris, Abdeslam Boularias and Jingjin Yu, both assistant professors of computer science, formed a team to deal with multiple aspects of the robot packing problem in an integrated way through hardware, 3D perception and robust motion.

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Cerebral organoids are artificially grown, 3D tissue cultures that resemble the human brain. Now, researchers from Japan report functional neural networks derived from these organoids in a study publishing June 27 in the journal Stem Cell Reports. Although the organoids aren’t actually “thinking,” the researchers’ new tool—which detects neural activity using organoids—could provide a method for understanding human brain function.

“Because they can mimic cerebral development, can be used as a substitute for the to study complex developmental and neurological disorders,” says corresponding author Jun Takahashi, a professor at Kyoto University.

However, these studies are challenging, because current cerebral organoids lack desirable supporting structures, such as blood vessels and surrounding tissues, Takahashi says. Since researchers have a limited ability to assess the organoids’ neural activities, it has also been difficult to comprehensively evaluate the function of neuronal networks.

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It’s no surprise that using human embryos for biological and medical research comes with many ethical concerns. Correct though it is to proceed with caution in these matters, the fact is that much science would benefit from being able to study human biology more accurately.

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