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In Senegal and Nigeria, two countries where poverty and health problems are pervasive, the most basic such measures — contact tracing, quarantine, and proper protections for health workers — seem to have had a positive effect.
In this work, we present a novel tri-axial touch sensor that measures contact force in three mutually perpendicular directions simultaneously.
Surface tension of mixtures was measured by a digital tensiometer (TD1C, Lauda) with Du Noüy ring method according to ASTM D1331-14 [23], which measures contact surface of liquid mixture with gas phase (air) at room temperature and atmospheric pressure with the precision of ± 0.01 mN m−1.
We also use the concept of bridging social networks, which measures contact with distant, little-known individuals.
Social distancing measures: Contact rates in the general population can be reduced by increasing "social distance", by closing schools and day care centres, by cancelling mass gathering events, or by behavioural changes.
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The setup was equipped with a shock accelerometer for measuring contact force and two photoresistors for accurate velocity measurement of the projectile just before impact.
At the particle, we assume a contact angle of 50°, based on the macroscopically measured contact angle of PEG on polystyrene, as well as measurements of PEG contact angles on carbon nanotubes, which have a similar value of 57.4 ± 5.9°.
Focusing on measuring contact time runs the risk of obsessing about the number of hours, rather than the quality – or the importance of extra-curricular activities and work experience.
The measured contact resistance was far below the ideal level.
The surface energy of the samples was calculated by measuring contact angle.
The sensor is capable of measuring contact pressures up to 8 MPa.
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