Theft! A History of Music

Greay Whales Eschristius robustus are the only large whales that are specialized bottom feeders, foraging on bottom sediments. When surfacing after a feeding dive a mud plume is formed at the surface as remaining sediment is strained out between the baleen. In the Chukchi Sea, Short-tailed Shearwaters Puffinus tenuirostris are attrackted to these mud plumes in search of food particles.Gråvalar Eschrichtius robustus är de enda stora valar som är söker föda genom att filtrera bottensediment. Då valen återkommer till ytan uppstår ett sedimentmoln då sediment pressas ut mellan barderna.    Under den svenska expeditionen “Beringia 2005ˮ sågs flockar om flera 10 000 övervintrande kortstjärtade liror Puffinus tenuirostris i Tjuktjerhavet. I områden där även födosökande gråvalar förekom, sökte lirorna aktivt föda i sedimentmolnen. Kortstjärtade liror lever i första hand på krill, och i de områden där de stora flockarna av liror observerades förekom höga koncentrationer plankton. Eftersom lirorna trotts tillgången på plankton dras till sedimentmolnen måste dessa innehålla organismer som är extra attraktiva som föda. Det är sedan tidigare känt att andra havsfåglar dras till sedimentmolnen, men detta är första gången det beskrivs för kortstjärtad lira

Influence of tides on melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica

An isopycnic coordinate ocean circulation model is applied to the ocean cavity beneath Filchner-Ronne Ice Shelf, investigating the role of tides on sub-ice shelf circulation and ice shelf basal mass balance. Including tidal forcing causes a significant intensification in the sub-ice shelf circulation, with an increase in melting (3-fold) and refreezing (6-fold); the net melt rate and seawater flux through the cavity approximately doubles. With tidal forcing, the spatial pattern and magnitude of basal melting and freezing generally match observations. The 0.22 m a(-1) net melt rate is close to satellite-derived estimates and at the lower end of oceanographic values. The Ice Shelf Water outflow mixes with shelf waters, forming a cold (<-1.9 degrees C), dense overflow (0.83 Sv) that spills down the continental slope. These results demonstrate that tidal forcing is fundamental to both ice shelf-ocean interactions and deep-water formation in the southern Weddell Sea. Citation: Makinson, K., P. R. Holland, A. Jenkins, K. W. Nicholls, and D. M. Holland (2011), Influence of tides on melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica, Geophys. Res. Lett., 38, L06601, doi: 10.1029/2010GL046462

Operation of Graphene Transistors at GHz Frequencies

Top-gated graphene transistors operating at high frequencies (GHz) have been fabricated and their characteristics analyzed. The measured intrinsic current gain shows an ideal 1/f frequency dependence, indicating an FET-like behavior for graphene transistors. The cutoff frequency fT is found to be proportional to the dc transconductance gm of the device. The peak fT increases with a reduced gate length, and fT as high as 26 GHz is measured for a graphene transistor with a gate length of 150 nm. The work represents a significant step towards the realization of graphene-based electronics for high-frequency applications

Dual Gate Graphene FETs with fT of 50 GHz

A dual-gate graphene field-effect transistors is presented, which shows improved RF performance by reducing the access resistance using electrostatic doping. With a carrier mobility of 2700 cm2/Vs, a cutoff frequency of 50 GHz is demonstrated in a 350-nm gate length device. This fT value is the highest frequency reported to date for any graphene transistor, and it also exceeds that of Si MOSFETs at the same gate length, illustrating the potential of graphene for RF applications

The Review of Economic Performance and Social Progress 2002: Towards a Social Understanding of Productivity

In this chapter, Graves and Jenkins explore the attitudes of Canadians to productivity. The distinction between our standard of living and our quality of life is a powerful one for Canadians generally. The economic citizen who emerges from Graves and Jenkins data is relatively aware of the terms of the productivity debate. Canadians appear to have a broadly optimistic view of the economy, but give the country only a lukewarm overall rating of its productivity. Moreover, although improved productivity does not rank as highly as health care, education, the environment and crime prevention, the public does see it as an important goal, qualified by some scepticism. Nevertheless, the Canadian public's attitude towards productivity is qualified by a commitment to a broader sense of the quality of life. Graves and Jenkins report that Canadians place considerably higher emphasis on quality of life as a goal as compared with a high standard of living when these are traded off. This attitude also influences the public's reaction to policy debate about the productivity agenda. As well, in their words, "there is a significant gap in the understanding of how productivity should be dealt with between the residents of the boardrooms and the residents of the family rooms of Canada".Government, Productivity, Growth, Labour Productivity, Labor Productivity, Living Standards, Quality of Life, Policy, Public Opinion, Innovation, Jobs, Employment, Unemployment, Investment

The Review of Economic Performance and Social Progress 2001: The Longest Decade: Canada in the 1990s

In this chapter, Paul Jenkins and Brian O'Reilly survey the monetary policy developments in the 1990s, focusing on links between monetary policy and the economic well-being of Canadians. The Bank of Canada economists do admit that tight monetary policy in the early 1990s hurt growth in the short-term, but they argue that such action was necessary to ratchet down entrenched inflationary expectations. Moreover, they argue that stagnation in the early part of the decade was not simply the result of monetary policy, but also reflected a weak US economy and structural problems in the Canadian economy.Monetary Policy, Inflation, Inflation Reduction, Inflation Policy, Growth, Recession, Well-being, Wellbeing, Well Being, Canada

Basal terraces on melting ice shelves

Ocean waters melt the margins of Antarctic and Greenland glaciers, and individual glaciers' responses and the integrity of their ice shelves are expected to depend on the spatial distribution of melt. The bases of the ice shelves associated with Pine Island Glacier (West Antarctica) and Petermann Glacier (Greenland) have similar geometries, including kilometer-wide, hundreds-of-meter high channels oriented along and across the direction of ice flow. The channels are enhanced by, and constrain, oceanic melt. New meter-scale observations of basal topography reveal peculiar glaciated landscapes. Channel flanks are not smooth, but are instead stepped, with hundreds-of-meters-wide flat terraces separated by 5–50 m high walls. Melting is shown to be modulated by the geometry: constant across each terrace, changing from one terrace to the next, and greatly enhanced on the ~45° inclined walls. Melting is therefore fundamentally heterogeneous and likely associated with stratification in the ice-ocean boundary layer, challenging current models of ice shelf-ocean interactions

Gyromagnetic Factors and Atomic Clock Constraints on the Variation of Fundamental Constants

We consider the effect of the coupled variations of fundamental constants on the nucleon magnetic moment. The nucleon g-factor enters into the interpretation of the measurements of variations in the fine-structure constant, alpha, in both the laboratory (through atomic clock measurements) and in astrophysical systems (e.g. through measurements of the 21 cm transitions). A null result can be translated into a limit on the variation of a set of fundamental constants, that is usually reduced to alpha. However, in specific models, particularly unification models, changes in alpha are always accompanied by corresponding changes in other fundamental quantities such as the QCD scale, Lambda_QCD. This work tracks the changes in the nucleon g-factors induced from changes in Lambda_QCD and the light quark masses. In principle, these coupled variations can improve the bounds on the variation of alpha by an order of magnitude from existing atomic clock and astrophysical measurements. Unfortunately, the calculation of the dependence of g-factors on fundamental parameters is notoriously model-dependent.Comment: 35 pages, 3 figures. Discussions of the effects of the polarization of the non-valence nucleons, spin-spin interaction and nuclear radius on the nuclear g-factor are added. References added. Matches published versio