Enn Original News
Lawrence Livermore Laboratory looking at ways to deflect killer asteroids
February 17, 2016 08:23 AM - Lawrence Livermore Laboratory
Asteroids headed for a collision with the Earth, if found early enough, can be acted upon to prevent the potentially devastating consequences of an impact. One technique to divert an asteroid, called kinetic impact, uses a spacecraft to crash into the body at high speeds.
This approach delivers the momentum of the spacecraft, while also providing an additional boost of momentum through the production of impact crater ejecta exceeding the asteroid’s escape velocity. Researchers at Lawrence Livermore National Laboratory (LLNL) have been studying the effectiveness of the kinetic-impactor strategy by carrying out 3D simulations of the process.
In a new paper published in Icarus(link is external), LLNL planetary defense researchers find that asteroid deflection by kinetic impact is sensitive to a range of asteroid characteristics, including strength, porosity, rotation and shape. These and other asteroid properties may not be well constrained before an actual deflection mission is staged, leading to variability in the deflection outcome. By simulating a range of initial conditions for the target asteroids, researchers were able to quantify, for example, how greater target strength decreases the delivered momentum impulse and how, for an asteroid of constant size, added porosity can result in more effective deflections, despite the dampening of the shock waves produced during an impact
The differences between organic and non-organic milk and meat
February 16, 2016 07:13 AM - Newcastle University
A new study has shown that both organic milk and meat contain around 50% more beneficial omega-3 fatty acids than conventionally produced products. Analysing data from around the world, the team led by Newcastle University, reviewed 196 papers on milk and 67 papers on meat and found clear differences between organic and conventional milk and meat, especially in terms of fatty acid composition, and the concentrations of certain essential minerals and antioxidants.
Man-made underwater sound may have wider ecosystem effects than previously thought
February 5, 2016 07:21 AM -
Underwater sound linked to human activity could alter the behaviour of seabed creatures that play a vital role in marine ecosystems, according to new research from the University of Southampton.
The study, reported in the journal Scientific Reports published by Nature, found that exposure to sounds that resemble shipping traffic and offshore construction activities results in behavioural responses in certain invertebrate species that live in the marine sediment.
Kalligrammatid lacewings looked like butterflies, but lived millions of years before butterflies
February 4, 2016 01:00 PM - JOHN BARRAT Smithsonian News
New fossils found in Northeastern China have revealed a remarkable evolutionary coincidence: an extinct group of insects known as Kalligrammatid lacewings (Order Neuroptera) share an uncanny resemblance to modern day butterflies (Order Lepidoptera). Even though they vanished some 50 million years before butterflies appeared on earth, they possess the same wing shape and pigment hues, wing spots and eyespots, body scales, long proboscides, and similar feeding styles as butterflies.
A photo of the modern owl butterfly (“Caligo Memnon”) shown beside a fossilized Kalligrammatid lacewing (“Oregramma illecebrosa”) shows some of the convergent features independently evolved by the two distantly-related insects, including wing eyespots and wing scales. (Butterfly photo by James Di Loreto/fossil photo by Conrad Labandeira and Jorge Santiago-Blay)
In an incredible example of convergent evolution, both butterflies and kalligrammatids evol
Phases of the moon affect amount of rainfall
February 1, 2016 07:20 AM - Hannah Hickey, University of Washington
When the moon is high in the sky, it creates bulges in the planet’s atmosphere that creates imperceptible changes in the amount of rain that falls below. New University of Washington research to be published in Geophysical Research Letters shows that the lunar forces affect the amount of rain – though very slightly.
Why does the human brain respond more to sounds than language?
January 19, 2016 04:02 PM - McGill University via EurekAlert
It takes just one-tenth of a second for our brains to begin to recognize emotions conveyed by vocalizations, according to researchers from McGill. It doesn't matter whether the non-verbal sounds are growls of anger, the laughter of happiness or cries of sadness. More importantly, the researchers have also discovered that we pay more attention when an emotion (such as happiness, sadness or anger) is expressed through vocalizations than we do when the same emotion is expressed in speech.
The researchers believe that the speed with which the brain 'tags' these vocalizations and the preference given to them compared to language, is due to the potentially crucial role that decoding vocal sounds has played in human survival.
How to make your new house a sustainable one
January 18, 2016 11:24 AM - Ewa Gromadzka
People might falsely believe that when they are building a house incorporating any sustainable solutions require additional costs and effort. It is actually the opposite. Some of the sustainable solutions require very little in any financing with comparison to the costs that need to be incurred anyways in a newly constructed building. Moreover, while an initial cost might be a bit higher as for purchasing, for example a sustainable heating system, there is a fast return on investment as utility bills are much lowers with sustainable heating than a standard one. It is possible to save around 30% on the use of energy and water in a sustainable house. That is a case with any other sustainable solution, when it pays off to invest in environment friendly solution in every case.
Below there is list of sustainable solutions that can be applied in every house.
- Heat recovery system for the ventilation, heating and cooling.
- The use of geothermal heat pump for heating the house, allows for great savings on heating costs.
- It is common to use only floor heating as a heating option in energy efficient houses (no radiators).
- Use of low energy doors and windows (recommended triple glazed windows).
Cloud cover found significant factor in Greenland Ice Sheet melt
January 13, 2016 06:27 AM - University of Wisconsin-Madison via EurekAlert!
The Greenland Ice Sheet is the second largest ice sheet in the world and it's melting rapidly, likely driving almost a third of global sea level rise.
A new study shows clouds are playing a larger role in that process than scientists previously believed.
"Over the next 80 years, we could be dealing with another foot of sea level rise around the world," says Tristan L'Ecuyer, professor in the Department of Atmospheric and Oceanic Sciences at the University of Wisconsin-Madison and co-author of the study. "Parts of Miami and New York City are less than two feet above sea level; another foot of sea level rise and suddenly you have water in the city."
Recycling on the ropes, France has a plan to fix the industry
January 11, 2016 05:29 AM - EurActiv
Low raw material costs have dealt a heavy blow to the recycling industry. The French recycling federation (FEDEREC) believes the sector needs a complete overhaul to stay afloat in the coming years.
FEDEREC published its view of the future of recycling in a white paper entitled "The recycling industry by 2030." In the preface to this 70-page document, a frank discussion of the problems facing the industry and how they might be solved, Corinne Lepage, a Republican politician, evoked a sector "devastated by an oil price that is so low that it is driving us back towards a linear economy, as it is cheaper today to buy primary raw materials than recycled raw materials".
Natural carbon sinks and their role in climate
January 10, 2016 11:32 AM - Mark Dwortzan | MIT Joint Program on the Science and Policy of Global Change
Protected areas such as rainforests occupy more than one-tenth of the Earth’s landscape, and provide invaluable ecosystem services, from erosion control to pollination to biodiversity preservation. They also draw heat-trapping carbon dioxide (CO2) from the atmosphere and store it in plants and soil through photosynthesis, yielding a net cooling effect on the planet.
Determining the role protected areas play as carbon sinks — now and in decades to come — is a topic of intense interest to the climate-policy community as it seeks science-based strategies to mitigate climate change. Toward that end, a study in the journal Ambioestimates for the first time the amount of CO2 sequestered by protected areas, both at present and throughout the 21st century as projected under various climate and land-use scenarios.