Retaking control of an autonomous
car affects human steering behavior, according to a new Stanford study that may
help in the design of future self driving vehicles. When human drivers retake
control of an autonomous car, the transition could be problematic, depending on
how conditions have changed since they were last at the wheel, researchers
said. There is this physical change and they need to acknowledge that people’s
performance might not be at its peak if they have not actively been
participating in the driving. The trouble the drivers had getting used to
different driving conditions was not enough to cause them to miss their turns,
but it was noticeable in the researcher’s measurements and by watching them
wobble the wheel to account for over and under steering. These challenges bring
up the possibility that, depending on the particulars of the driver, the
driving conditions and the autonomous system being used, the transition back to
driver controlled driving could be an especially risky window of time.
Scientific updates
Monday, 19 December 2016
Soft Robotic Hand 'Feels Like Humans'
Scientists have developed a soft
robotic hand that can feel its surroundings internally, just as humans, and
performs tasks like picking out ripe tomatoes. Most robots achieve grasping and
tactile sensing through motorized means, which can b excessively bulky and
rigid. Researchers from Cornell University in the US, led by assistant
professor Robert Shepherd, showed how stretchable optical waveguides can act as
curvature, elongation and force sensors in a soft robotic hand. Most robots
today have sensors on the outside if the bodies that detect things form the
surface. These sensors are integrated within the body, so they can actually
detect forces being transmitted through the thickness of the robot, a lot like
we and all organisms do when we feel pain. Optical waveguides have been in use
since the 1970s for numerous sensing functions. The team used its prosthesis to
perform many tasks, including probing for shape and texture. The hand was able
to scan tomatoes and determine, by softness, which was the ripest.
Methane In Air Rising 10 Times Faster Than Before, Warn Experts
A decade long surge of the potent
greenhouse gas methane threatens to make the fight against global warming even
harder, researchers warned on 12 December. Additional attention is urgently
needed to quantify and reduce methane emissions. After rising slowly from 2000
to 2006, the concentration of methane in the air climbed 10 times more quickly
the following decade, according to that study, published in the peer reviewed
Earth System Science Data. The largely unexplained – increase was especially sharp
in 2014 and 2015. Keeping global warming below 2°C is already a challenging
target. On current trends, average global temperatures are on track to jump by
more than 3°C by 2100, even if national carbon cutting pledges annexed to the
Paris Agreement are honored. Methane is 28 times more efficient at trapping the
Sun’s heat than CO2. About a third of human generated methane is a byproduct of
the fossil fuel industry, while two-thirds come from livestock production and
agriculture.
Insulin Cells Under Skin Could Save Diabetics From Jabs
Scientists have created artificial
cells that act as sugar sensors and insulin producers, an advance that may
spell an end to painful needle jabs to monitor blood glucose levels, making the
everyday life of diabetics easier. Researchers have used the simplest approach
yet to produce artificial beta cells from human kidney cells. The therapy
involves a capsule of genetically engineered cells implanted under the skin
that automatically release insulin as required. Diabetic mice that were treated
with the cells were found to have normal blood sugar levels for several weeks. Previous
approaches were based on stem cells, which the scientist allowed to mature into
beta cells either by adding growth factors of by incorporating complex genetic
networks. For the new approach, researchers at ETH Zurich (Swiss Federal
Institute of Technology in Zurich) used a cell line based on human kidney
cells, HEK cells. The researchers used the natural glucose transport proteins
and potassium channels in the membrane of the HEK cells. They enhanced these
with a voltage dependent calcium channel and a gene for the production of
insulin and GLP-1, a hormone involved in the regulation of the blood sugar
level. In the artificial beta cells, the HEK cells’ natural glucose from the
bloodstream into the cell’s interior. When the blood sugar level exceeds a
certain threshold, the potassium channels close. This flips the voltage distribution
at the membrane, causing the calcium channels to open. As calcium flows in, it
triggers the HEK cells’ built-in signaling cascade, leading to the production
and secretion of insulin or GLP-1. In developing the artificial cells, experts
had the help of a computer model which allows predictions to be made of cell behavior,
which can be verified experimentally.
Friday, 16 December 2016
Experts Inch Closer To 'Star In Jar' Reactor
Scientists have taken a big step
towards developing a ‘star in a jar’ nuclear fusion reactor that can provide
Earth with limitless clean energy in the same manner as the Sun and other
stars. The Wendelstein 7-X (W7-X) fusion energy device currently operated by
Max Planck Institute for Plasma Physics in Germany is on track and working as
planned, experts said. The system, known as a stellerator, generated its first
batch of hydrogen plasma when it was first fired up earlier this year. A fusion
reactor works by fusing the nuclei of lighter atoms into heavier atoms. The process
releases massive amounts of energy and produces no radioactive waste. The ‘fuel’
used in a fusion reactor is simple hydrogen, which can be extracted from water.
However, to achieve fusion, scientists must generated enormously high
temperatures to heat the hydrogen into a plasma state, ‘Live Science’,
reported. That is where the W7-X stellerator design comes in. the device confines
the plasma within magnetic fields generated by superconducting coils cooled
down to near zero. The plasma never comes into contact with the walls of the
containment chamber.
Japan Launches Craft To Collect Space Junk
Japan launched a cargo ship on
Friday bound for the International Space Station, carrying a ‘space junk’
collector that was made with the help of a fishnet company. The vessel, dubbed “Kounotori”
(stork in Japanese), blasted off from the southern island of Tanegashima just
before 10:27pm on 9 December local time attached to an H-IIB rocket. Scientists
at the Japan Aerospace Exploration Agency are experimenting with a tether to
pull junk out of orbit around Earth, clearing up tonnes of space clutter
including cast-off equipment from old satellites and pieces of rocket.
Virus In Mummy May Rewrite Smallpox History
The discovery of smallpox DNA in a
17th century child mummy may shorten the timeline of the deadly
infectious diseases history, according to a study published on 8 December. Specimens
of the smallpox causing variola virus now exist only in secured laboratory freezers.
The highly contagious and sometimes fatal disease was eradicated in the late
1970s through a worldwide vaccination campaign. But the origins of the virus
remain unknown. The discovery of the smallpox virus within the DNA of the mummy
child, found in a crypt underneath a Lithuanian church, could shed light on how
it began and developed, researchers said in the study published in the US scientific
journal Current Biology. There have been signs that Egyptian mummies that are
3,000 to 4,000 years old have pock-marked scarring that have been interpreted
as cases of smallpox. The new discoveries really throw those findings into question,
and they suggest that the timeline of smallpox in human populations might be
incorrect. The researchers reconstructed the genome of the ancient strain of
the virus and compared it with versions of the variola virus genome dating from
the mid-1900s and before its eradication.
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