https://github.com/GyanD/codexffmpeg/releases/tag/2023-03-05-git-912ac82a3c

RSID: <<2024-10-31T23:31Z MFSK-32 @ 9265000+1500>>
 

Welcome to program 376 of Shortwave Radiogram.

I'm Kim Andrew Elliott in Arlington, Virginia USA.

Here is the lineup for today's program, in MFSK modes as noted:

  1:43 MFSK32: Program preview (now)
  2:51 MFSK32: Daylight saving time linked to lost productivity
  8:01 MFSK64: Ultra-thin film absorbs electromagnetic waves*
12:37 MFSK64: This week's images*
28:27 MFSK32: Closing announcements

* with image(s)


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From Phys.org:


Daylight saving time linked to lost worker productivity

Posted by Sherri Buri McDonald
University of Oregon
October 29, 2024

As much of the world prepares to turn clocks back an hour this
fall, new research from the University of Oregon finds the annual
spring forward to daylight saving time affects worker
productivity more than previously thought.

Rather than affecting workers for just a day or two, the
adjustment to daylight saving time can affect worker productivity
for up to two weeks, said Glen Waddell, a UO labor economist and
co-author of a new research in the Journal of Economic Behavior
and Organization. He collaborated on the paper with Andrew
Dickinson, a doctoral student in economics in the UO's College of
Arts and Sciences.

The researchers did not identify a similar effect in the fall.
They found that early-morning productivity picked up following
the return to standard time.

Waddell and Dickinson looked at the daily work activity of
174,505 people who used GitHub around the transition to daylight
saving time from 2013 to 2019. GitHub is a cloud-based
version-control platform used by software developers, engineers
and other collaborative programmers. It has 83 million users
worldwide.

The publicly available GitHub records enabled the researchers to
examine worker activity down to the second.

"When we look inside the day, hour by hour, we're actually able
to see patterns of workers getting off to a bumpy start in the
early morning and trying to make up for their lost productivity
throughout the rest of the afternoon, and this is happening for
upwards of two weeks," Waddell said.

Although GitHub users don't represent all workers, they do
provide valuable insights into how "losing" an hour in the
transition to daylight saving time affected their productivity,
he said.

The researchers also looked at the effect on workers when they
returned to standard time in the fall.

"We actually see a picking up of productivity in those early
morning hours, 8 a.m. to 10 a.m., with the extra sleep being the
likely reason," Waddell said.

The paper's findings have direct relevance for the 1.6 billion
people in 75 countries who change to daylight saving time each
spring and back to standard time each fall.

The research also comes at a time when United States lawmakers
are considering abandoning the yearly time change. In 2021, the
U.S. Senate unanimously passed the Sunshine Protection Act, which
would end the return to standard time for the months of November
to March.

"Our research findings could be interpreted as yet more reason to
put this clock-switching experiment behind us," Waddell said. "If
we were fence-sitters before, maybe this is just another nudge
toward the direction of doing away with this practice."

Arizona and Hawaii already remain on standard time all year, and
a growing number of countries, including China, Russia, Pakistan
and Brazil, also have abandoned daylight saving time.

Introduced in 1916 and soon after adopted by many Western
countries, daylight saving time was intended to save energy.
However, consensus opinion today finds the energy savings to be
negligible, on the order of plus or minus 1%, according to the
paper.

https://phys.org/news/2024-10-daylight-linked-lost-worker-productivity.html


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From TechXplore:

Ultra-thin film that absorbs nearly all electromagnetic waves
could improve reliability of wireless communication

by National Research Council of Science and Technology
(South Korea)
October 28, 2024

A conceptual diagram of the electromagnetic wave absorption and
shielding material developed by the research team, along with the
designed conductive pattern. Credit: Korea Institute of Materials
Science (KIMS)

The research team of Dr. Byeongjin Park and Dr. Sang Bok Lee from
the Composites & Convergence Materials Research Division at the
Korea Institute of Materials Science (KIMS), has developed the
world's first ultra-thin film composite material capable of
absorbing over 99% of electromagnetic waves from various
frequency bands (such as 5G/6G, WiFi, and autonomous driving
radar) using a single material.

The findings were published as the cover article in the October 1
edition of Advanced Functional Materials.

This electromagnetic wave absorption and shielding material is
less than 0.5mm thick and is distinguished by its low reflectance
of less than 1% and high absorbance of over 99% across three
different frequency bands.

Electromagnetic waves emitted by electronic components can cause
interference, leading to performance degradation in other nearby
electronic devices.

Electromagnetic shielding materials are used to prevent this, and
absorbing electromagnetic waves is more effective at reducing
interference than merely reflecting them. However, conventional
electromagnetic shielding materials reflect over 90% of the
waves, with an actual absorbance often as low as 10%. Moreover,
materials with higher absorbance are typically limited to
absorbing electromagnetic waves within a single frequency band.

To overcome these limitations, the research team developed a
composite material that can absorb electromagnetic waves across
multiple frequency bands simultaneously.

This technology absorbs and eliminates electromagnetic waves,
resolving secondary interference issues. The material is also
thin, flexible, and durable enough to maintain its shape even
after being folded and unfolded thousands of times, making it
suitable for use in rollable phones and wearable devices.

The team synthesized a magnetic material by altering the crystal
structure of ferrite, enabling it to selectively absorb desired
frequencies. They produced an ultra-thin polymer composite film
and incorporated conductive patterns on the film's back side to
control the propagation of electromagnetic waves.

By adjusting the shape of the conductive pattern, electromagnetic
wave reflection at specific frequencies can be dramatically
reduced. Additionally, a carbon nanotube thin film with high
shielding properties was applied to the back to further enhance
the material's electromagnetic wave shielding capabilities.

Senior researcher Byeongjin Park of KIMS, who led the project,
said, "As the applications of 5G/6G communications continue to
expand, the importance of electromagnetic wave absorption and
shielding materials is growing."

He added, "This material has the potential to significantly
improve the reliability of wireless communication devices such as
smartphones and autonomous vehicle radars."

The research team has completed domestic patent registration and
has also applied for patents in the U.S., China, and other
countries. Additionally, the technology has been transferred to
several domestic material companies, and it is currently being
applied to actual communication devices and automobiles.

https://techxplore.com/news/2024-10-ultra-thin-absorbs-electromagnetic-reliability.html
 

Image: The electromagnetic wave absorption and shielding
material, showing its thin and flexible form and its shape
remaining intact even after 5,000 bending tests ...


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This is Shortwave Radiogram in MFSK64

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This week's images ...


An alley of trees in Sierksdorf at the Baltic Sea, Germany,
October 26. https://tinyurl.com/2bqo6ymq ...

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A cross section of European beach grass (Ammophila arenaria)
leaf. From the 2024 Small World Photomicrography Competition.
https://tinyurl.com/25o43jq3 ...

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The Wailor Swift inflatable monster, part of Manchester's annual
Halloween in the City celebrations, October 23.
https://tinyurl.com/2bkq98ll ...

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An autumn leaf suspended in air by a strand of a spider's web, in
Wilrijk, Belgium, October 22. https://tinyurl.com/2bkq98ll ...

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A cormorant gets a running start to take off from Northeast
Harbor, Maine, at sunrise, October 21.
https://tinyurl.com/2bkq98ll ...

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English Heritage lights up the ruins of Whitby Abbey, in North
Yorkshire, October 23. https://tinyurl.com/2bkq98ll ...

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Fall color in western Prince William County, Virginia.
https://tinyurl.com/2amxwqga ...

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Foliage on 28th Street NW in Washington DC, October 22.
https://tinyurl.com/2bfmu39q ...

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Our painting of the week is "Red Lamp" by Susan Ryder (English,
b.1944). https://tinyurl.com/2aofrap5 ...

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I'm Kim Elliott. Please join us for the next Shortwave
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