Tech Briefs Magazine - June 2023 - 37
nizes the chemical and then stimulates
the production of a signal. The amplification
allows the researchers to know
that tiny amounts of the chemicals are
present and at what level.
In this latest work, the researchers
used the nanoparticles in two types of
tests to measure two chemicals simultaneously.
The chemicals were spiked
into fruit and vegetable samples that
were pureed in a blender.
One of the tests uses the palladium-platinum
nanoparticles to catalyze a
reaction that causes a color change in a
sample when the herbicide is present.
The test can be done using a small unit
that can be carried into the field.
The other test the researchers developed
uses the nanoparticle in a low-cost
paper strip that looks like a COVID-19 or
pregnancy test and can be read with a
smartphone reader.
The tests were sensitive enough to
measure the chemicals down to the
maximum acceptable levels and were
validated using traditional testing
methods.
" We're actually able to detect below
the maximum concentration limits if
there's any pesticide or herbicide in the
sample, " said Van Wie. " That's good because
while this can be done by other
methods, this method is low-cost and
portable in the field. "
For more information, contact Annie
Du at annie.du@wsu.edu.
Can Your Phone Tell if a Bridge Is in Good Shape?
A new study suggests mobile data collected while traveling over bridges could help
evaluate their integrity.
Massachusetts Institute of Technology, Cambridge, MA
W
ant to know if the Golden Gate
Bridge is holding up well? There
could be an app for that.
A new study involving MIT researchers
shows that mobile phones placed in
vehicles, equipped with special software,
can collect useful structural
integrity
data while crossing bridges. In so doing,
they could become a less expensive alternative
to sets of sensors attached to
bridges themselves.
" The core finding is that information
about structural health of bridges can be
extracted from smartphone-collected accelerometer
data, " said Carlo Ratti, Director
of the MIT Senseable City Laboratory
and co-author of a new paper
summarizing the study's findings.
The research was conducted, in part,
on the Golden Gate Bridge itself. The
study showed that mobile devices can
capture the same kind of information
about bridge vibrations that stationary
sensors compile. The researchers also
Tech Briefs, June 2023
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Tech Briefs Magazine - June 2023
Table of Contents for the Digital Edition of Tech Briefs Magazine - June 2023
Tech Briefs Magazine - June 2023 - Intro
Tech Briefs Magazine - June 2023 - Sponsor
Tech Briefs Magazine - June 2023 - Cov1A
Tech Briefs Magazine - June 2023 - Cov1B
Tech Briefs Magazine - June 2023 - Cov1
Tech Briefs Magazine - June 2023 - Cov2
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Tech Briefs Magazine - June 2023 - Cov3
Tech Briefs Magazine - June 2023 - Cov4
Tech Briefs Magazine - June 2023 - MD-Cov1
Tech Briefs Magazine - June 2023 - MD-Cov2
Tech Briefs Magazine - June 2023 - MD-1
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