The narrow groove theory was proposed in 1965 by J. H. Vohr and C. Y. Chow, two engineers at New York-based Mechanical Technology, Inc. The theory explains the working of herringbone grooved journal bearings, or HGJBs – a type of air-lubricated bearing that supports rotating parts in mechanical systems.
Many different types of bearings exist, but HGJBs hold the most promise for developing ultrahigh-speed rotating machines because the rotor is supported on a cushion of air generated by the rotating shaft.
Overheating batteries are a serious risk, in the worst cases leading to fires and explosion. A team including researchers from the University of Tokyo has developed a simple, cost-effective method to test the safety of lithium-ion batteries, which opens up opportunities for research into new and safer batteries for the future. The work is publishedNature Energy.
The researchers created an intentionally unstable battery which is more sensitive to changes that could cause overheating. The battery is one-50th the size of conventional batteries, so it is less resource-intensive and tests can be carried out in a smaller lab environment.
News stories abound of lithium-ion batteries overheating, smoking or even exploding. This makes safety testing a top priority for both manufacturers and consumers.
Researchers categorized participants by whether or not they had experienced SCD, and by their antidepressant medication use — between 1 and 5 years, or 6 years and longer.
At the study’s conclusion, researchers found that participants who used antidepressants for a period of 1 to 5 years had a 56% increased risk of SCD.
Participants who used antidepressants for 6 or more years had a 2.2 times higher risk for SCD.
IN A NUTSHELL 🚀 Pulsar Fusion is developing the Sunbird, a fusion-powered rocket, to significantly reduce interplanetary travel times by 2027. 🔬 The Sunbird uses a Duel Direct Fusion Drive (DDFD) engine, promising unprecedented exhaust speeds and efficiency. 🛰️ The rocket will operate as a space “tugboat,” stationed in orbital satellite docks for missions to
