Tag Archives: arizona

Grand Canyon as Old as the Dinosaurs, Suggests New Study Led by CU-Boulder

By Guest PostDecember 6, 2012Scienceapatite, apatite crystals, arizona, atom, bottom, caltech, colorado boulder, colorado river, detect, earth, evolution, grand canyon, helium atom, hydrology, kenneth farley, landscape, mineral grains, phosphate mineral, radioactive decay, rebecca flowers, surface, tectonics, thermal structure, thorium, topography, university, uranium, variation, western

An analysis of mineral grains from the bottom of the western Grand Canyon indicates it was largely carved out by about 70 million years ago — a time when dinosaurs were around and may have even peeked over the rim, says a study led by the University of Colorado Boulder.

The new research pushes back the conventionally accepted date for the formation of the Grand Canyon in Arizona by more than 60 million years, said CU-Boulder Assistant Professor Rebecca Flowers. The team used a dating method that exploits the radioactive decay of uranium and thorium atoms to helium atoms in a phosphate mineral known as apatite, said Flowers, a faculty member in CU-Boulder’s geological sciences department. (more…)

Advancing the Digital Humanities

By Guest PostNovember 4, 2012Educationafrican american literature, arizona, aurasma application, bryan carter, cable television, culture, devices, digital format, digital humanities, internet, ipads, iphones, jeremy patrick gesuale, ken mcallister, mobile network, music, o2, online course, phone calls, smartphone, social media, surfing, Technology, telegraph, uk, university, voicethreads, web

Bryan Carter, a UA assistant professor of Africana studies, is among faculty members in the arts and humanities more readily employing consumer-based technologies in educational, creative, interdisciplinary and engaging ways.

Take a guess – what are the most common uses for devices like smartphones?

Earlier this year, the UK-based mobile network O2 reported that, on average, people use their smartphones to access the Internet, communicate via social media and listen to music. Other popular uses, as explained by an article in The Telegraph, include playing games and making phone calls. (more…)

UA’s Kate Kenski Tracks Election Through Talking Points, Tweets

By Guest PostOctober 22, 2012Politics2008 campaign, analyze, arizona, Barack Obama, bethany conway, colbert report, corey pavlich, daily show, democrat, democratic president, Economy, election, election season, Facebook, facebook page, factor, jon stewart, kate kenski, Media, mitt romney, money, naes, networking site, obama victory, political ads, political communication, political gaffes, political humor, Politics, polling data, polls, presidential candidate, republican, republican candidate, social media, tax season, Twitter, twitter follower, university

Kate Kenski, an associate professor in the UA communication department, is studying the 2012 election using talking points, Twitter feeds and also jokes.

Election season is to politics-watchers as tax season is to accountants. There are polls to follow, debates to dissect and political ads to analyze.

For Kate Kenski, an associate professor in the University of Arizona communication department and School of Government and Public Policy, election season provides a wealth of data that she analyzes to write and teach about public opinion and political communication.

For the 2012 election, Kenski is keeping a keen eye on whether the frequent explanations for wins and losses in previous campaigns hold true for this campaign. Will the economy be the determining factor? Or will candidate personality or message strategy tip the campaign in one candidate’s direction over the other’s? (more…)

Armchair Astronomers Find Planet in Four-Star System

By Guest PostOctober 16, 2012Scienceamerican, arizona, arxiv preprint, astronomical data, astronomical society, circumbinary planet, citizen scientist, cottonwood, debra fischer, discovery, earth, eclipsing star, Environment, four star, hawaii, jerome orosz, johns hopkins, keck telescopes, kepler spacecraft, kian jek, mauna kea, meg schwamb, NASA, neptune, nevada, orbit, ph1, phenomenon, planet, planet discovery, planet formation, planethunters, professional astronomer, radius, reno, robert gagliano, san diego, san francisco, server, star, state university, system, twin suns, university, website, yale

A joint effort of citizen scientists and professional astronomers has led to the first reported case of a planet orbiting twin suns that in turn is orbited by a second distant pair of stars.

Aided by volunteers using the Planethunters.org website, a Yale-led international team of astronomers identified and confirmed discovery of the phenomenon, called a circumbinary planet in a four-star system.

Only six planets are known to orbit two stars, according to researchers, and none of these are orbited by distant stellar companions. (more…)

UA Study Examines How News Spreads on Twitter

By Guest PostOctober 15, 2012Media, Technologyarizona, arstechnica, bbc, bbcbreaking, bbcworld, bloomberg, delicious, devi bhattacharya, digg, financial news, financial times, fireworks, Forbes, global news, guardian, mashable, microblogging website, network analysis, new york times, news agency, news articles, npr, online content, paulo goes, reddit, retweets, Reuters, social media, sudha ram, technology news, twitter account, twitter activity, twitter effectiveness, twitter feeds, university, us news, washington post, wired

A study of the Twitter activity of 12 major news agencies shows varying levels of success for the social network as a news-sharing tool, based on factors like article lifespan and number of retweets.

Nearly every major news organization has a Twitter account these days, but just how effective is the microblogging website at spreading news? That’s the question University of Arizona professor Sudha Ram set out to answer in a recent study of a dozen major news organizations that use the social media website as one tool for sharing their content.

The answer, according to Ram’s research, varies widely by news agency, and there may not be one universally applicable strategy for maximizing Twitter effectiveness. However, news agencies can learn a lot by looking at how their news diffuses once it is posted on Twitter, said Ram, McClelland Professor of Management Information Systems in the UA’s Eller College of Management. (more…)

Freezing Electrons in Flight

By Guest PostOctober 13, 2012Science1878, arizona, artificial, arvinder sandhu, atmosphere, atom, attosecond, camera, chemical process, destruction, eadweard muybridge, earth, electron, electron emission, electronic devices, electronic motion, emulsion plate, excited atom, femtosecond, formation, ground, henry timmers, high energy, horse, iconic series, laser flash, laser pulses, microscopic dynamics, molecular process, muybridge, mystery, natural, niranjan shivaram, oxygen molecule, ozone, phenomena, photo, photograph, physical, quintillionths, real-time, second, stroboscopy, super excited, technique, touch, ultrafast, ultraviolet light, university, upper atmosphere, zeptosecond

Using the world’s fastest laser pulses, which can freeze the ultrafast motion of electrons and atoms, UA physicists have caught the action of molecules breaking apart and electrons getting knocked out of atoms. Their research helps us better understand molecular processes and ultimately be able to control them in many possible applications.

In 1878, a now iconic series of photographs instantly solved a long-standing mystery: Does a galloping horse touch the ground at all times? (It doesn’t.) The images of Eadweard Muybridge taken alongside a racetrack marked the beginning of high-speed photography.

Approximately 134 years later, researchers in the University of Arizona department of physics have solved a similar mystery, one in which super-excited oxygen molecules have replaced the horse, and ultrafast, high-energy laser flashes have replaced Muybridge’s photo emulsion plates. (more…)

Cambrian Fossil Pushes Back Evolution of Complex Brains

By Guest PostOctober 10, 2012Nature, Scienceancient animal, arachnids, arizona, arthropods, brain anatomy, branchiopod brain, branchiopods, brine shrimp, cambrian fossil, cambrian period, China, common ancestor, complex brain, course, crustaceans, dna sequence, evolution, evolutionary biologist, fuxianhuia protensa, gregory edgecombe, hypothesis, insects, malacostracans, microscope, missing link, modern brain, modern malacostracan, molecular data, morphology, mudstone, multicellular animals, Nature, neural anatomy, neurobiologist, neurocladistics, neuropils, nicholas strausfeld, optic lobes, origin, sensory organ, species, taxonomic group, transformative discovery, university, xianguang hou, xiaoya ma, yunnan province, yunnan university. kunming

Complex brains evolved much earlier than previously thought, as evidenced by a 520-million-year-old fossilized arthropod with remarkably well-preserved brain structures.

The remarkably well-preserved fossil of an extinct arthropod shows that anatomically complex brains evolved earlier than previously thought and have changed little over the course of evolution. According to University of Arizona neurobiologist Nicholas Strausfeld, who co-authored the study describing the specimen, the fossil is the earliest known to show a brain.

The discovery will be published in the Oct. 11 issue of the journal Nature. (more…)

Doctors Wary of Studies Funded by Pharmaceutical Industry, Study Shows

By Guest PostOctober 8, 2012General, Healthaaron kesselheim, arizona, biomedical research, christopher robertson, clinical trial, doctor, fda, federal budget, good drug, good science, high quality, method, methodological rigor, nih, pharmaceutical company, physician, quality, research, trust, university

Physicians are about half as willing to prescribe drugs tested in pharmaceutical-industry funded trials than those in NIH-funded studies, a new study finds.

Physicians are less likely to trust the results of clinical trials when they know those trials were funded by pharmaceutical companies, regardless of the quality of the research, a recent study in the New England Journal of Medicine shows.

The study, led by Dr. Aaron Kesselheim of the Harvard Medical School in Boston and co-authored by University of Arizona associate professor of law Christopher Robertson, evaluated physicians’ confidence in the results of drug trials conducted with a high, medium or low level of methodological rigor. It then looked at how their confidence in those same results changed when a trial’s funding source was revealed as either the National Institutes of Health or a company in the pharmaceutical industry, versus when no funding source was disclosed. (more…)