News Picks

Physics Today’s online staff summarize the most important and interesting news about science from the world's top media outlets.

There are 87 posts for the selected month (October 2014).

Filter by date

October 30, 2014 3:05 PM

Control of vocal frequency is the key to charismatic speaking

BBC: The ability to control vocal frequency and to apply other effects determined by cultural influences appears to be the technique used by the most effective speakers. In a new study, UCLA's Rosario Signorello and colleagues modified the vocal frequencies of recorded speeches from several male politicians. They asked 250 volunteers to categorize the speeches by choosing from 67 adjectives, such as attractive, convincing, dishonest, dynamic, fair, and scary. The volunteers were also asked which voices they preferred. The researchers found that the best speakers were able to adjust their voices to convey a range of different characteristics as needed. The ability to reach deeper tones, which can be considered authoritative or sexy, is partially inherent in speakers with larger voice boxes and vocal folds. But much of what determined charisma depended on the audience: French listeners preferred moderate frequencies, which they said sounded prudent and fair, while Italian listeners preferred lower-pitched voices, which they perceived as authoritarian and menacing.

October 30, 2014 3:00 PM

Origin of Earth's nitrogen-rich atmosphere lies in plate tectonics, says study

Ars Technica: One reason life developed on Earth may be the planet's abundance of nitrogen, an essential ingredient for the formation of amino and nucleic acids. About four-fifths of Earth’s atmosphere is composed of nitrogen. Until recently, however, exactly where the nitrogen came from was unknown. Now Sami Mikhail and Dimitri Sverjensky of the Carnegie Institution of Washington propose that Earth’s plate tectonics are responsible. Nitrogen is easily incorporated into silicate minerals, not only on Earth but also on other planets, such as Earth’s nearest neighbors, Venus and Mars. Unlike those neighbors, however, Earth is geologically active, and the combination of plate subduction and volcanic eruptions results in the release of copious amounts of volatile chemicals, including nitrogen, into the atmosphere. According to the researchers' findings, nitrogen started accumulating in Earth’s atmosphere some 3 billion years ago, which agrees with other estimates for how long Earth’s plate tectonic system has been active.

October 30, 2014 12:00 PM

New index provides universal definition of a heat wave

Nature: In response to global warming, the Heat Wave Magnitude Index (HWMI) has been devised to provide a way to compare the severity of heat waves around the world and over time. Similar to the Richter scale for comparing the magnitude of earthquakes, the HWMI is designed to be more comprehensive than previous systems by taking into account heat intensity and duration in different regions and in different years. According to the new scale, the worst heat wave to date occurred in Russia during the summer of 2010 when 55 000 people died. The HWMI also predicts that the number and size of heat waves will continue to increase throughout the 21st century, a prediction consistent with earlier research.

October 30, 2014 11:25 AM

Suite of science projects lost when space station resupply ship exploded

Science: The Tuesday evening launch of an unmanned Antares rocket from Wallops Flight Facility in Virginia ended abruptly with an explosion six seconds after liftoff. The rocket, built by Orbital Sciences Corp, was headed to the International Space Station with 748 kg of supplies and 727 kg of scientific experiments. Many of the projects lost were designed by students. One, from the Duchesne Academy of the Sacred Heart—an all-girl college preparatory school in Houston, Texas—was to investigate how well fast-growing plants, such as pea shoots, do in microgravity and when exposed to red and blue wavelengths of light. Despite the sad outcome, school administrators emphasized the importance of the experience gained in participating in the program and creating the experiments.

October 29, 2014 2:34 PM

Icelandic eruption is releasing unusual amounts of sulfur dioxide

Nature: On 29 August, the Icelandic volcano Bárðarbunga began erupting in a steady flow of lava that has not stopped. It has produced more lava than any Icelandic eruption since 1947, but the amount of sulfur dioxide it has released is far beyond any predictions. Nearly 35 000 tons of SO2 is being released daily, twice as much as produced by all European industries combined. The high levels have caused breathing problems for nearby residents and have elevated pollution readings all the way into central Europe. The Icelandic Meteorological Office is attempting to track and provide warnings about the gas cloud's movement. However, the volcano's remote location and the onset of winter are making it hard to closely monitor the eruption. The timing of the eruption was good because it began in the middle of FUTUREVOLC, an ongoing study of vulcanism and the movement of magma.

October 29, 2014 2:20 PM

Asteroid could experience avalanches when it passes Earth

Science: In 2029, a football-field-sized asteroid known as Apophis is going to pass within 35 000 km of Earth. Our planet is not in any danger, but simulations run by Derek Richardson of the University of Maryland, College Park, and his colleagues suggest that Apophis could experience avalanches, albeit very small ones. Pictures of another asteroid believed to be similar to Apophis indicate that instead being solid rock, the two asteroids are clumps of debris loosely held together by gravity. In Richardson's simulation, the tidal force of Earth's gravity caused small, slow-moving avalanches of the lighter pieces of debris on the asteroid's surface. Although astronomers will not be able to see the avalanches directly, IR pictures of the surface could reveal areas that have been uncovered as the surface shifts.

October 29, 2014 1:45 PM

Saturn’s moon Enceladus may have snow cone at its center

New Scientist: Astronomers continue to be surprised by Saturn’s moon Enceladus. Most of the planets and moons studied so far consist of a core of dense material covered by a large mantle and an outer crust. Based on computer modeling, however, Enceladus’s core can’t be stiff and rocky and also produce the huge watery plumes that have been observed shooting into space as the moon orbits Saturn. In order to generate the heat necessary to melt the icy crust and shoot the jets, the moon’s core may be more like a rubble pile with empty spaces filled with ice or water, similar to a snow cone. The finding has implications for the search for extraterrestrial life because such hydrothermal systems are important to the formation of biological organisms.

October 29, 2014 10:45 AM

Google X lab developing cancer-detecting pill

Globe and Mail: People may one day pop a pill filled with magnetized nanoparticles that will circulate through the body looking for signs of cancer. That is one of many projects being developed by Google X, a facility dedicated to exploring innovative technologies, such as the self-driving car. The cancer-detecting nanoparticles would be coated with antibodies that bind with abnormal cells. A device worn by the patient would then recall the nanoparticles and download the data they’ve gathered. Such technology could monitor an individual’s health 24/7, deliver medicine to localized areas, and detect other problems as well, such as arterial plaques. So far, the project is only in the exploratory phase.

October 28, 2014 4:25 PM

Quantum internet may entail shipping qubits across oceans

MIT Technology Review: A quantum version of the internet is being envisioned to securely transmit information. Because such a network would use entangled photons to transfer data, it would avoid the potential interference or hijacking of information that can occur during transmission through optical fibers or other conventional media. However, quantum networks will still encounter some of the same logistical problems, such as how to relay information across the oceans. Whereas quantum repeaters can extend the range of entanglement, they have been shown to work only over short distances and may prove too delicate to withstand the hostile conditions at the bottom of the sea. Now Simon Devitt from Ochanomizu University in Japan and colleagues have proposed that the quantum bits of information, or qubits, be transported across the water via container ship. Unlike conventional photons, the qubits would carry entanglement rather than actual information. Once they were in position, communication between them would be even faster than traditional repeater networks.

October 28, 2014 3:05 PM

Fermi provides another potential signal of galactic dark matter

New Scientist: Two previous detections of gamma rays from the center of the Milky Way have been cited as evidence of the annihilation of dark-matter particles. Now astronomers have spotted a third gamma-ray source that matches the predictions of dark-matter annihilation as well. Kevork Abazajian of the University of California, Irvine, and his colleagues predicted that starlight passing through the center of the Milky Way would scatter in a particular way off electrons produced by the annihilations.  They found evidence of just such a signal in data collected by the Fermi Gamma-Ray Space Telescope and all-sky starlight surveys. However, proving that the electrons that cause the scattering came from dark-matter annihilation is a more difficult task.

October 28, 2014 11:45 AM

IR telescope captures first-ever images of nova explosion

Guardian: For the first time, astronomers have captured images of a nova, a nuclear explosion on a white dwarf star. Nova Delphini 2013 was first detected last year by the CHARA Array IR telescope at Mount Wilson Observatory in Los Angeles. Such explosions are believed to occur in binary star systems, when a white dwarf is able to accrete enough hydrogen from its companion star that it ignites and starts nuclear fusion. Within hours of the explosion, astronomers were able to point the array telescopes toward the nova to take interferometric measurements of its size and expansion rate. From that data, they have determined that the nova is about 14 800 light-years from the Sun, which means the explosion occurred some 15 000 years ago. When last measured 43 days after the explosion, the nova had expanded nearly 20-fold.

October 28, 2014 10:42 AM

UK's Met Office plans upgrade for weather-forecasting supercomputer

BBC: The UK's Met Office has confirmed that it will build a £97 million ($156 million) supercomputer to replace the one it currently uses for weather and climate modeling. The computing facility's location will be split between the Met Office's headquarters and a new facility, both in Exeter. The first computations will take place in September 2015. The Cray XC40 will have a processor speed of 16 petaflops (16 × 1015 calculations per second), 13 times faster than the current machine, and will have 17 petabytes of storage. That will allow for faster and more accurate weather forecasts as well as better and longer-scale climate models. Because of the UK's location and geography, weather forecasting is more difficult than in many other places. The Met Office estimates that improved forecasts could provide £2 billion in economic benefits.

October 27, 2014 2:45 PM

Steady decline in US carbon emissions stalled by cold winter

Ars Technica: According to the US Energy Information Administration (EIA), total US emissions of carbon dioxide rose in 2013 compared with the previous year. The rise constitutes an upward blip in a downward trend that began nine years ago. Increased economic activity was not responsible for the rise, says the EIA. Although US GDP per capita rose by 1.5% from 2012 to 2013, the gain was partly offset by increased energy efficiency. Rather, the boost in emissions resulted primarily from the unusually low temperatures of last winter, which led to increased burning of fuel oil. Another contributor was a rise in the price of natural gas, which prompted electric utilities to save money by burning more coal.

October 27, 2014 2:30 PM

Faster ferroelectric switching

MIT Technology Review: Ferroelectric materials can be made to reverse the direction of their polarization by applying an electric field. Once changed, the direction of the polarization persists, a property that has been exploited to store data. But until now, the speed at which the change occurs has been too low to rival the switching speeds attained by silicon-based transistors. A collaboration led by Lane Martin of the University of California, Berkeley, and Andrew Rappe of the University of Pennsylvania has developed a ferroelectric material, lead zirconate titanate (PbZr0.2Ti0.8O3), that can switch much faster than standard ferroelectrics. The key to the gain in speed lies in growing crystals of the material at a particular orientation, which creates two so-called side states of polarization in addition to the regular two states. The faster-switching side states can be manipulated by applying an electric field in a particular direction.

October 27, 2014 2:15 PM

Creationists to convene at major research university

Science: Creation Summit, a nonprofit Christian group that believes in a literal interpretation of the Bible, will hold its Origins Summit on 1 November at Michigan State University. The conference venue was booked through a campus student group. Among the sessions listed in the summit's program are ones devoted to why the Big Bang is fake, how evolutionary theory shaped Adolf Hitler's worldview, and why natural selection is not evolution. Michigan State is the academic home of several prominent evolutionary biologists, including Robert Pennock, whose testimony played a role in Kitzmiller v. Dover Area School District, a 2005 case that led to a ban on teaching intelligent design in public schools. Citing the right to free speech, university authorities have said they do not intend to interfere with the summit.

October 27, 2014 2:00 PM

Asteroid miners set to launch private space telescope

New Scientist: Today, if all goes to plan, a cookie-jar-sized space telescope called Arkyd 3 will hitch a ride to space on Orbital Sciences' next commercial mission to resupply the International Space Station. Built by Planetary Resources, the telescope is a test bed for technology for identifying asteroids whose metal content could be profitably mined. Ultimately, Planetary Resources, which is backed by movie director James Cameron, X-Prize founder Peter Diamandis, and Google executive chairman Eric Schmidt, plans to launch 10 space telescopes.

October 24, 2014 1:04 PM

EU commits to stringent reductions in carbon emissions

BBC: At a meeting yesterday in Brussels, the leaders of the countries that constitute the European Union committed themselves to reducing the EU's total emissions of carbon dioxide by 2030 to levels that are 40% lower than they were in 1990. Although the target is ambitious, it represents a compromise between environmental groups, which had pushed for greater reductions, and the leaders of the countries, such as Poland, that obtain a large fraction of their electrical energy from coal-fired plants. The EU is already on course to cut its CO2 emissions by 20% by 2020 compared with 1990 levels.

October 24, 2014 1:03 PM

Algorithm runs faster on quantum computer

New Scientist: Twenty years ago Daniel Simon devised a simple period-finding problem that a quantum computer could conceivably solve exponentially faster than a classical computer. Now Mark Tame of the University of KwaZulu-Natal in Durban, South Africa, and his collaborators have built an elementary, photon-based quantum computer that not only solves Simon's problem but also reaches a solution faster when run in quantum mode than in classical mode. Although Simon's problem is too simple to be useful, its design inspired other, potentially more useful algorithms.

October 24, 2014 1:02 PM

Archival data constrain properties of hypothetical dark-matter particles

Science: An experiment that ran at SLAC from 1980 to 1982 shot a beam of electrons at an aluminum target in hope of detecting evidence of axions, hypothetical particles devised to explain the absence of CP violation in the strong nuclear force. No axions were seen, and the negative result was duly written up. Decades later Rouven Essig of Stony Brook University in New York realized that the old experiment, known as E137, could also shed light on another hypothetical particle, the dark-matter candidate known as the χ. If χ particles behave as originally conceived, they would have caused a signal in E137 that the experimenters would have seen, but didn't. Essig and his collaborators' reinterpretation of the old experiment doesn't rule out χ particles, but it does constrain their properties.

October 24, 2014 1:01 PM

Aleutian tsunami likely swamped Hawaii centuries ago

Ars Technica: Tsunamis occur when an earthquake causes a section of an undersea fault to slip. The sudden displacement of crust launches a wave perpendicular to the fault. Knowing the positions of the faults that encircle the Pacific Ocean, Rhett Butler of the University of Hawaii at Manoa and his colleagues modeled the propagation of tsunamis from the northern Pacific. Their goal: to determine the origin of a huge tsunami that deposited debris in a sinkhole on the Hawaiian island of Kauai centuries ago. To fill the sinkhole, which lies 100 m from the shore, the tsunami must have topped 7 m. According to the simulations that Butler and his colleagues performed, the earthquake that caused the tsunami must have had a magnitude of at least 9. Crucially, the earthquake must have originated in the eastern Aleutian Islands. Tsunamis launched from other locations miss Hawaii.

See more
This is a required field
Please enter a valid email address
24f368529419bb89b4d14b71017867b2 weblog.blogzxybnytfddd
Scitation: News Picks - Blog