Physics Today Daily Edition
New Scientist: The city of Beijing has decided to ban coal burning by 2020, and China plans to prohibit the construction of new coal-fired power plants there and in several other cities. Air pollution has become increasingly severe in Beijing, due not only to coal burning but also to vehicle emissions and dust storms. To compensate for the loss of coal as an energy source, the Chinese government is investing instead in renewables and nuclear power and is promoting energy efficiency measures. Because China accounts for half the world’s coal consumption, the proposed ban could signal the end of the global boom in coal production.
Nature: Microorganisms and bacteria have been found living in tiny water droplets suspended in the largest natural asphalt lake in the world—Pitch Lake on the island of Trinidad. In a study published today in Science, researchers used nuclear magnetic resonance and mass spectrometry to examine the complex microbial communities, which were seen to be eating and processing the oil. Their findings indicate a possible strategy for oil companies to reduce biodegradation of oil reservoirs by eliminating the formation of such microdroplets. But companies might also be able to use the droplets to clean up oil spills underground where pipelines have burst. In addition, the microorganisms’ ability to thrive in such inhospitable environments has led the researchers to propose that similar life forms could exist on other worlds, such as beneath the hydrocarbon lakes of Saturn’s moon Titan.
BBC: On 30 July the Halley VI Research Station, run by the British Antarctic Survey (BAS), lost power for 19 hours. The station is located on the Brunt Ice Shelf, which floats on the Weddell Sea and where outdoor temperatures during Antarctic winter can go as low as –32 °C. Although power and some heating are back on line, the station has not yet returned to normal operation. The BAS reports that all staff are currently safe and in good health. The cause of the power loss has not yet been determined.
Sydney Morning Herald: A group of Australian scientists has warned that recent cuts to budgets and science programs could adversely affect the country’s leadership in Antarctic research. The cuts are particularly ill-timed because of Antarctica’s growing importance in the study of climate change. The continent comprises one-tenth of Earth’s land surface, nearly 90% of Earth’s ice, and 70% of its fresh water, according to a Nature article in which leading scientists outline the six most pressing priorities for Antarctic science. One of the scientists, Steven Chown of Monash University, has emphasized the need for increasing international collaboration and funding to ensure against gaps in long-running research and loss of key researchers in the field. He also points out that “science leadership in the region is the key to political influence” and, hence, to determining whether Antarctica's future will focus on environmental stewardship or resource exploitation.
Science: The US House of Representatives has been criticized for its recent science bill, but the one introduced in the Senate looks more promising to science advocates. The House’s Frontiers in Innovation, Research, Science, and Technology Act of 2014 passed in May after a year-long battle, during which House Republicans rejected all 13 of the Democrats’ proposed amendments. The bill, which sets policy for NSF and NIST, would severely cut NSF’s funding of research in the social, behavioral, and economic sciences. In contrast, the Senate’s America COMPETES Reauthorization Act of 2014, introduced by John “Jay” Rockefeller (D-WV), calls for “robust” funding increases for both NSF and NIST. In addition, Senate Republicans, led by John Thune (R-SD), appear more willing to compromise. The Senate science panel is expected to address the bill next month.
New Scientist: A recent study applies the concept of pattern recognition used in computational linguistics to research on key molecular structures in organic chemistry. Bartosz Grzybowski of Northwestern University in Evanston, Illinois, and his colleagues treated molecules as sentences and molecular fragments as words. They then developed an algorithm to find fragments that are common among different molecules and rank their frequency. They also looked for the fragments with the highest information content. What they found was that the bonds connecting the most informative molecular fragments were often key bonds that connect simpler compounds and serve as building blocks for more complex molecules. Although the parallels between chemistry and language are not clear-cut, the tools the researchers have developed could prove useful in picking out unique chemical fragments that might be missed by human researchers and that could be used in the development of new compounds and pharmaceuticals.
Nature: Mercury levels in the upper ocean have tripled since the beginning of the Industrial Revolution, according to a study published in Nature. Because of mercury’s unique properties, it has come to be used in applications from fossil-fuel electrical power plants to laboratory equipment to cosmetics. However, mercury is highly toxic, and as it leaks into the air and onto the land, it eventually ends up in the oceans, where it can make its way into the food chain. To try to determine how marine mercury pollution levels have changed over time, the researchers collected thousands of water samples from the Atlantic and Pacific Oceans. Because surface water has been more recently exposed to mercury pollution than water deeper down, samples of different depths were compared. However, the researchers found that despite the disturbing rise in mercury pollution, the oceans are not uniformly contaminated. That leads them to believe that efforts to reduce mercury pollution could be effective.
Science: Now that NSF has released the first installment of construction funding, work on building the Large Synoptic Survey Telescope in Chile is about to begin. The telescope is notable for its unusual design: It will have three mirrors instead of the usual two. The result will be a very wide field of view, which will allow the telescope to photograph the entire sky every few nights. Among the project's goals are the detection of faint astronomical objects, transient optical events such as supernovae, and evidence of possible dark matter and dark energy. One of the biggest challenges will be how to manage the large volume of data the telescope will produce once it begins operating around the year 2020.
Ars Technica: Despite global warming, global temperatures continue to exhibit sporadic dips. To better understand the year-to-year variability in global surface temperature, a group of researchers developed a series of climate model experiments that looked at the complex relationship between the Atlantic and Pacific Oceans, the trade winds that blow between them, and their impact on the atmosphere. Despite the model's complexity, the experiments failed to completely explain the most recent bout of lower-than-average global surface temperatures. According to the researchers, some other factor must be contributing. They point to a volcanic eruption in the Philippines that occurred more than two decades ago: Not only did it lower temperatures for several years immediately following the event, it may have caused widespread climate perturbations that are still being felt today.
Nature: Set up in 2003 to provide a definitive database of open-access scholarly publications, the Directory of Open Access Journals (DOAJ) has grown to comprise some 10 000 listings. However, because of complaints that some of the journals exercise questionable practices, such as providing minimal peer review, the DOAJ has decided to introduce stricter standards. To weed out the substandard journals, all publishers have been asked to reapply for listing on the DOAJ website. The new application form requests more detailed information about each journal, including specifics concerning the quality and transparency of its editorial process, its digital archiving policy, and its content licensing. DOAJ founder Lars Bjørnshauge hopes that the reapplication process will create one of the largest “whitelists” of acceptable open-access journals.
New York Times: Earlier today the European Space Agency’s Rosetta probe became the first ever to enter into orbit around a comet. Its arrival marked the end of a 10-year, 6-billion-kilometer odyssey to connect with comet 67P/Churyumov–Gerasimenko. The trip included three flybys of Earth and one of Mars, which served as gravitational slingshots to get Rosetta up to speed and put it on the same orbital path as the comet. Now the probe can begin a yearlong observation period, during which time the comet is expected to make its nearest approach to the Sun. During that time, 67P/C–G should heat up and grow the long tail of water vapor and dust that is characteristic of comets. In November, to get an even closer look at that transition, Rosetta will launch a small lander that will attach itself to the comet’s surface.
BBC: A new robot design uses a trial-and-error algorithm to diagnose problems and find a way for the robot to keep operating. The algorithm was modeled on the behavior of injured animals, which have been known to adapt to a wide variety of injuries. Unlike current robot designs, which rely on a limited number of fixes preprogrammed into their system, the new design can handle unforeseen problems by allowing robots "to creatively discover compensatory behaviors,” say the researchers in their paper published on the arXiv website. Their prototype robot was successful in learning to adjust after having one of its six legs broken, and it did so in just two minutes. Such a self-learning robot could be useful in situations where humans can’t go, such as certain space missions, search and rescue operations, and disaster response.