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LOS ANGELES Cheap Jerseys China Free Shipping , Oct. 22 (Xinhua) -- Scientists of the U.S. National Aeronautics and Space Administration (NASA) have just come up with a new model to help allocate scarce observing time to the most promising candidate planets beyond our solar system that might support life, according to a new research published this week in the Astrophysical Journal.


"Using a model that more realistically simulates atmospheric conditions, we discovered a new process that controls the habitability of exoplanets and will guide us in identifying candidates for further study," said Yuka Fujii of NASA's Goddard Institute for Space Studies (GISS), lead author of the study, in a statement.


NASA has been hot on the trail of Earth-like planets.


Previous studies were forced to rely on one-dimensional and vertical models to simulate atmospheric conditions. The new research uses a model that calculates conditions in all three dimensions Cheap Jerseys China Wholesale , allowing scientists to simulate the circulation of the atmosphere and the special features of that circulation, which one-dimensional models cannot do, according to NASA.


Liquid water is essential to life as we know it. If the temperature of an alien world allows liquid water to be present for sufficient time to allow life to thrive, it is considered potentially habitable. If a planet is too distant from its star, its surface water will freeze; if it is too close, its surface water will evaporate and be lost to space.


This happens when water vapor rises to a layer in the upper atmosphere called the stratosphere and gets broken into its elemental components Cheap Jerseys Free Shipping , hydrogen and oxygen, by ultraviolet light from the star. The extremely light hydrogen atoms can then escape to space.


Planets in the process of losing their oceans this way are said to have entered a "moist greenhouse" state because of their humid stratospheres.


For exoplanets orbiting close to their parent stars, the team found that the near-Infrared radiation (NIR)-driven process could increase moisture in the stratosphere gradually. So, it is possible, contrary to old model predictions, that an exoplanet closer to its parent star could remain habitable.


The new approach demonstrated that since these stars emit the bulk of their light at NIR wavelengths Cheap Jerseys Wholesale , a moist greenhouse state will result even in conditions comparable to or somewhat warmer than Earth's tropics, researchers say.


In the future, the team plans to vary those planetary characteristics, such as gravity, size, atmospheric composition and surface pressure to see how they affect water vapor circulation and habitability.




SAN FRANCISCO Cheap Jerseys From China , Oct. 26 (Xinhua) -- Surgical residents suffering burnout are more likely to be at the risk of high anxiety, depression, substance abuse and thoughts of suicide, said a study of the U.S. University of California San Francisco (UCSF) released Thursday.


The latest study, published in the Journal of the American College of Surgeons, found that 70 percent of the 566 surgical residents surveyed said they had or were experiencing burnout driven by emotional exhaustion and doubts about their effectiveness at work.


"Burnout among physicians affects mental health Cheap Jerseys China , performance and patient outcomes. Surgery residency is a high-risk time for burnout," said the study.


The research was conducted in September 2016 by a team led by Carter Lebares, an assistant professor in the UCSF Department of Surgery.


"Trainees with burnout and high stress were at increased risk for depression, and suicidal ideation," the study found.


It said 69 percent of the respondents experienced high burnout composed of emotional exhaustion and depersonalization, which can manifest as feeling detached from patients or becoming more cynical in general.


About 20 percent of the residents suffered moderate to severe depressive symptoms Cheap Jerseys Discount , approximately twice as high as in the general age-matched population, according to the study.


Suicidal thoughts were present in 11 percent of the residents, more than three times higher than in the general population, it said.


It also found that nearly half of the residents, about 49 percent, misused alcohol Cheap Jerseys , more than five times the prevalence of misuse recorded among the general public, and 33 percent of them reported alcohol abuse or dependence, twice as prevalent as in practicing surgeons.


Female residents were not an exception, said the study, noting that 58 of them admitted to have experienced alcohol misuse and abuse.


However, the study found that emotional exhaustion Wholesale NBA Basketball Jerseys , high stress and anxiety seemed to improve considerably some years after their peak level, which was recorded in the third year of surgical residency.

Home > Interior DesignLandscape Design Canberra: Bring Nature To Your Home

Posted by ricky26 in Home on July 9th, 2014


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