Power/Performance Bits: Feb. 8
Transparent sensor; graphene-enhanced heat pipes; large perovskite solar cells.
Transparent sensor
Researchers at Osaka University created a thin, flexible, transparent sensor using silver nanowire networks. High-resolution printing was used to fabricate the centimeter-scale cross-aligned silver nanowire arrays, with reproducible feature sizes from 20 to 250 micrometers. As a proof-of-concept for functionality, they used their arrays to detect electrophysiological signals from plants.
A patterned polymer surface was created to define the subsequent nanowire feature size. Using a glass rod to sweep silver nanowires across the pattern led to either parallel or cross-aligned nanowire networks.
“The sheet resistance of patterns less than 100 micrometers ranged from 25 to 170 ohms per square, and the visible light transmittance at 550 nanometers was 96% to 99%,” said Teppei Araki, an assistant professor at Osaka University. “These values are well-
| June 10, 2015
Researchers at Stanford University and the University of California-Berkeley have developed a state-by-state plan for the United States to generate 100 percent of its energy from renewable sources by 2050.
The study – which was published last month in the journal
Energy and Environmental Sciences – calls for major changes to infrastructure as well as current energy consumption practices. The study’s authors outline ways to combat climate change, eliminate air pollution mortality, create jobs, and stabilize energy prices.
“The main barriers are social, political and getting industries to change. One way to overcome the barriers is to inform people about what is possible,” Stanford engineering professor Mark Z. Jacobson said in a press release. “By showing that it’s technologically and economically possible, this study could reduce the barriers to a large scale transformation.”
The consequences are most severe for low-income and minority children, who were less likely to have the necessary computer technology when remote learning
Fitbits ‘can tell 92% of people with Covid they are infected up to SEVEN days before symptoms’
11 Jan 2021, 13:04
Updated: 11 Jan 2021, 14:42
FITBITS can help detect if people have Covid, sometimes before their symptoms have shown, a study shows.
The common wearable devices track patterns in heart rate, which can be used to look for abnormalities caused by viruses.
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Fitbits can help detect if people have Covid, a study has shownCredit: Getty Images - Getty
People who are infected with the coronavirus typically do not show obvious signs - such as a cough, high temperature or loss of taste and smell - for five or six days.