Global temperature records set in
2015 – the hottest year so far – may become the new norm by 2025 if carbon
emissions continue to rise at the same rate. Human activities have already
locked in this new ‘normal’ for future temperatures but immediate climate action
could prevent record extreme seasons year after year. If we don’t reduce our
rate of emissions, the record hot summer of 2013 in Australia - when we saw
temperatures approaching 50 degrees Celsius in some areas – could be just
another average summer season by 2035. So, what is the idea of a new normal? Researchers
determined that a new normal occurred when at least half of the years following
an extreme year were cooler and half warmer. Only then can a new normal state
be declared. This process was also used to determine new normal conditions for
seasonal and regional changes to the climate. Using the ANU’s National
Computational Infrastructure supercomputer to run climate models, the
researchers explored when new normal states would appear under the
Intergovernmental Panel for Climate Change’s four emissions pathways. The results
revealed that while global average temperatures would inevitably enter a new
normal under all emissions scenarios, this was not the case at seasonal and
regional levels. Researchers found that with prompt action to reduce greenhouse
gases, a new normal might never occur in the 21st century at
regional levels during the southern hemisphere summer and northern hemisphere
winter.
Monday, 14 November 2016
Water Found On Metallic Asteroid
Scientists have detected the
presence of water on Psycho, a largest metallic asteroid in our solar system
and the target of a proposed NASA mission. New observations from the NASA
Infrared Telescope Facility in Hawaii show evidence of water or hydroxyl on its
surface. While the source of these molecules on Psycho remains a mystery,
Joshua Emery, from the University of Tennessee, said that water-rich minerals
detected on the asteroid might have been delivered by carbonaceous asteroids
that impacted Psyche in the distant past.
A Battery Made From Junkyard Metal
Researchers have developed a new
high-performance, grid-scale battery made from metal scrap and common household
chemicals. The battery, which is the size of a pill bottle, can withstand the
equivalent of 13 years of daily charging and discharging while retaining 90% of
its capacity. Researcher said that the battery was powerful and easy to build. Researchers
were inspired from an ancient technology called the Baghdad Battery, which dates
to the first century BC. It consisted of a terracotta pot, a copper sheet and
an iron rod along with some trace chemicals that could have been an
electrolyte. The team soaked metal in a jar with a solution of water and salt. They
then applied a voltage to induce a process called anodisation, which
restructures the nanoscopic composition of a metal. That exposes the metal’s
interior surface and makes it more receptive to storing and releasing energy. Researchers
placed a barrier between the two pieces of metal and submerged it in an
electrolyte solution made from water and potassium hydroxide. When connected by
wires to a device that generated a current, their contraption worked like a car
battery.
Ebola Virus Mutated To Better Infect Humans
The Ebola virus may have adapted to
better infect human cells, say scientists who identified mutations in the
deadly virus that developed during the recent epidemic in West Africa. More than
28,000 people have been infected with the virus and more than 11,000 people
died from the disease. To study whether the virus might have changed
genetically in response to infection of such large numbers of people, the
researchers used Ebola virus gnomic sequences to track virus mutations. They found
that mutations of the gene that encodes the Ebola virus glycol-protein
increased the virus’ ability to infect cells of humans and other primates. Ebola
virus circulated in an unknown animal reservoir and rarely crosses over into
people. When the virus does cross over, the effect has been devastating to
those people who are infected. Until recently, the human diseases outbreaks
have been short lived, and the virus has had little opportunity to adapt
genetically to the human host. By increasing infectivity in human cells, it is
possible that these mutations increased Ebola virus spread during the outbreak.
Sunday, 13 November 2016
A Smart Glue That Works Under Water
Scientists are developing a “smart
glue” – using mussel proteins – that can bond securely underwater and may be
turned on and off with electricity. There is no smart adhesive out there that
can perform underwater. The chemistry that researchers can potentially
incorporate into the adhesive, causing it to reversibly bond and de-bond is
quite new. Such“smart glue” can bind underwater sensors and devices to the
hulls of ships and submarines and help unmanned vehicles dock along rocky
coastlines or in remote locations. The adhesive can also lead to new kinds of
bandages that will stay attached when someone sweats or gets wet, and make it
less painful to remove a dressing. The smart glue may even be used to attach
prosthetic limbs and biometric sensors or seal surgical wounds.
New VR System Lets You Feel Rain, Beating Heart
Researchers have developed a
360-degree virtual reality application using a unique chair to provide full body
sensations that enables users to add customizable “feel effects” such as
raindrops or a beating heart. Virtual reality has seen a renaissance in recent
years as advancements in computer graphics, computing platforms and the
seamless flow of information between hardware and software have come together
in a powerful way. Researchers team is working to make VR haptic sensations
just as rich as the 360 degree visual media now available. Current VR systems
provide ‘buzz like’ haptic sensations through hand controllers. But technology
exists for much richer sensations. Researchers have created a framework that
would enable users to select form a wide range of meaningful sensations that
can be adjusted to complement the visual scene and to play them through a
variety of haptic feedback devices. The haptic playback and authoring plug-in
developed by the researchers connects a VR game engine to a customized haptic
device. It allows users to create, personalize and associate haptic feedback to
the events triggered in the VR game engine. The haptic definition app, called
VR360HD, was developed and tested using a consumer headset and Disney researcher’s
haptic chair. The chair features a grid of six vibrotactile actuators in its
back and two subwoofers or “shakers” in the seat and back. The grid produces localized
moving sensations in the back, while the subwoofers shake two different regions
of the body and can create a sensation of motion. Users were able to select
from a library of feel effects tested by the team.
This Rewritable Paper Can Be Used More Than 40 Times
Scientists have developed a
low-cost, environmentally friendly way to create printed material with
rewritable paper that can reduce paper wastage. Even in the present digital
age, the world still relies on paper and ink, most of which ends up in landfills
or recycling centers. Researchers made the new material by mixing low-toxicity tungsten
oxide and polyvinyl pyrrolidone, a common polymer used in medicines and food. To
“print” on it, they exposed the material to ultraviolet light for 30 seconds,
and it changed from white to a deep blue. To make pictures or words, a stencil
can be used so that only the exposed parts turn blue. To erase them, the
material can be put in ambient conditions for a day or two. To speed up the
erasing, the researchers added heat to make the color disappear in 30 minutes. Alternatively,
adding a small amount of polyacrylonitrile to the material can make the designs
last for up to 10 days. Tests showed that the material can be printed on and
erased 40 times before the quality started to decline. More paper is now
recovered for recycling than almost all other materials combined, researchers
said. The new material saves energy, water, and landfill space and greenhouse
gas emissions.
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