1. Defects with Character: Majorana Local Modes in Condensed-Matter Systems

    01:13:53

    from UK College of Arts & Sciences Added 23 0 0

    Dr. Bertrand Halperin Harvard University Theory predicts the existence of some peculiar phases of quantum condensed matter systems that have multiple degrees of freedom with very low energy, when localized “defects” are introduced. I shall focus on a class of these phases where each defect has half of a conventional degree of freedom, and the defects may be considered as sites for localized zero-energy states of a “Majorana fermion”. Such defects would also exhibit the intriguing property of “non-Abelian statistics” -- i.e., if various defects can be moved around each other, or if two identical defects can be interchanged, the result is a unitary transformation on the quantum mechanical state that depends on the order in which operations are performed but is insensitive to many other details. In my talk, I will try to explain these various concepts and discuss the attempts to realize them in condensed matter systems.

    + More details
    • Nov. 2014: 40 Years of Faculty Colloquium

      03:22

      from Ouachita Baptist University Added 31 0 0

      "The Ouachita Show" is Ouachita Baptist University's monthly news magazine featuring campus updates and profiles.

      + More details
      • Rapid Arctic warming and extreme weather events in mid-latitudes: Are they connected?

        50:14

        from UK College of Arts & Sciences Added 49 0 0

        Dr. Jennifer Francis Rutgers University In this presentation, I will discuss the hypothesis proposed by Francis and Vavrus (2012) that links rapid Arctic warming (so-called Arctic amplification) to changes in the large-scale atmospheric circulation in the northern hemisphere that favors more persistent weather patterns and a higher likelihood of extreme weather events such as droughts, cold spells, flooding, heavy snows, and heat waves. This hypothesis has been a topic of considerable controversy in recent months, particularly regarding its relationship to the unusual weather conditions that persisted in the winter of 2013/2014. I will discuss various aspects of this linkage, what we know and don't know, and present new related research.

        + More details
        • Science Policy in America

          01:09:24

          from UK College of Arts & Sciences Added 13 0 0

          Dr. Tyler Glembo The American Physical Society Science Policy in America Fundamental scientific research, as a majority federally funded initiative, is becoming more deeply embedded in politics. Since the end of the Space Race, funding of basic physical sciences research as a percent GDP has continuously declined, indicating that policy makers see funding scientific research as less of a priority than they once did. Indeed, a lack of understanding about both science and how science is done amongst members of Congress has led to both reduced prioritization and also to misguided attempts at regulation, such as making peer review a public process and considering Congressional oversight for specific grants. Here we will examine a few current issues in science policy and the need for physicists to effectively weigh in on such policy issues. We will also consider the positive or negative effects such public engagement may have on our scientific careers and ways in which you can get involved.

          + More details
          • Reading the City as a Blind Person

            31:12

            from Global Urban Humanities Added 43 0 0

            On September 18, 2014, Georgina Kleege (English) and Christopher Downey (Architecture) spoke about navigating the city as a blind person, with perspectives informed by their professions of writer and designer. This talk was part of the Reading Cities, Sensing Cities colloquium presented by the Global Urban Humanities Initiative at UC Berkeley. http://globalurbanhumanities.berkeley.edu/

            + More details
            • Unravelling the Mysteries of Neutrinos

              01:13:59

              from UK College of Arts & Sciences Added 20 0 0

              Dr. Stephen Parke Fermilab Neutrinos are the most numerous massive particles in the Universe. Their masses are very tiny, no larger than one millionth the mass of the electron. Are they like all the known massive fermions, being four component particles, or are they a new type of fermion never seen before, a two component fermion? Are there only only three neutrinos or are there more species of neutrinos? Of the three neutrinos we know of, we have determined part of the massing pattern but not the completely pattern. Also we have measured some of their mixing parameters with reasonable precision via neutrino oscillation experiments but not all. Do neutrinos violate CP in neutrino oscillations? Can neutrinos help explain the baryon-antibaryon asymmetry of the Universe? I will address many of the important questions about the neutrinos and how the future Fermilab program will address some of these questions.

              + More details
              • Hold on and Draw Near

                28:32

                from School of Christian Studies Added 1 0 0

                Dr. Marshall Johnston, Dean of Student Affairs for the South Texas School of Christian Studies, speaks for Logsdon Colloquium on September 18, 2014

                + More details
                • Ultra High Energy Cosmic Rays: Recent results from the Pierre Auger Observatory

                  58:03

                  from UK College of Arts & Sciences Added 23 0 0

                  Dr. Fred Sarazin Colorado School of Mines The cosmic ray spectrum spans many orders of magnitude in energy. At the very end of the spectrum (E>10^18 eV) lie the Ultra High Energy cosmic rays (UHECRs). Their origin remains largely unknown and their study is made difficult in part by the very low flux impinging on Earth's atmosphere. The Pierre Auger Observatory, located in the Mendoza province of Argentina, is an array of detectors spread over 3000 km^2 specifically designed to study the properties of the extensive air showers induced by the UHECRs in the atmosphere. The Observatory is fully operational since 2008 and is operated by a collaboration of more than 500 scientists and engineers from 19 countries. In this colloquium, a selection of recent results obtained by the Observatory and the plan for the upcoming upgrade will be presented.

                  + More details
                  • Terrorists and Towels: Blessed is the one who handles them correctly (John 13:13-17)

                    18:30

                    from School of Christian Studies Added 7 1 0

                    Dr. Tony Celelli, President, speaks for Logsdon Colloquium on September 11, 2014

                    + More details
                    • Hane Taoshi Kata explained

                      04:33

                      from AKBAN academy Added 20 0 0

                      Yossi Sheriff explains one of the reasons for the preliminary action in Kukishinden ryu kata using a modified Hane Taoshi kata. http://www.akban.org/wiki/Hane_taoshi_no_kata,_Okuden_gata_level,_Kukishin_Ryu

                      + More details

                      What are Tags?

                      Tags

                      Tags are keywords that describe videos. For example, a video of your Hawaiian vacation might be tagged with "Hawaii," "beach," "surfing," and "sunburn."