The water cycle in a changing climate

Millions of people across the globe are already affected by natural variability in the water cycle. A multidisciplinary team of experts from the University of East Anglia and the University of Nottingham, led by Timothy Osborn, Professor of Climate Science at the world-renowned Climatic Research Unit, set out the empirical evidence - and argue the need for implementation of measured adaptation mechanisms that take into account uncertainties in the projection of future precipitation patterns

Loss Dependence on Geometry and Applied Power in Superconducting Coplanar Resonators

The loss in superconducting microwave resonators at low-photon number and low temperatures is not well understood but has implications for achievable coherence times in superconducting qubits. We have fabricated single-layer resonators with a high quality factor by patterning a superconducting aluminum film on a sapphire substrate. Four resonator geometries were studied with resonant frequencies ranging from 5 to 7 GHz: a quasi-lumped element resonator, a coplanar strip waveguide resonator, and two hybrid designs that contain both a coplanar strip and a quasi-lumped element. Transmitted power measurements were taken at 30 mK as a function of frequency and probe power. We find that the resonator loss, expressed as the inverse of the internal quality factor, decreases slowly over four decades of photon number in a manner not merely explained by loss from a conventional uniform spatial distribution of two-level systems in an oxide layer on the superconducting surfaces of the resonator.Comment: 4 pages, 5 figures, Submitted to ASC 2010 conference proceeding

Optical Production of Stable Ultracold 88^{88}Sr2_2 Molecules

We have produced large samples of ultracold $^{88}$Sr$_2$ molecules in the electronic ground state in an optical lattice. The molecules are bound by 0.05 cm$^{-1}$ and are stable for several milliseconds. The fast, all-optical method of molecule creation via intercombination line photoassociation relies on a near-unity Franck-Condon factor. The detection uses a weakly bound vibrational level corresponding to a very large dimer. This is the first of two steps needed to create Sr$_2$ in the absolute ground quantum state. Lattice-trapped Sr$_2$ is of interest to frequency metrology and ultracold chemistry.Comment: 5 pages, 3 figure

Equivalent of a Thouless energy in lattice QCD Dirac spectra

Random matrix theory (RMT) is a powerful statistical tool to model spectral fluctuations. In addition, RMT provides efficient means to separate different scales in spectra. Recently RMT has found application in quantum chromodynamics (QCD). In mesoscopic physics, the Thouless energy sets the universal scale for which RMT applies. We try to identify the equivalent of a Thouless energy in complete spectra of the QCD Dirac operator with staggered fermions and $SU_c(2)$ lattice gauge fields. Comparing lattice data with RMT predictions we find deviations which allow us to give an estimate for this scale.Comment: LATTICE99 (theor. devel.), 3 pages, 4 figure

The Limits of Creativity in Copyright: Digital Manufacturing Files and Lockout Codes

As the distinction between the digital and physical worlds continues to diminish, the necessity to reevaluate the bargain struck by the copyright regime increases in importance. Digitization brings increasingly more aspects of our world into the potential ambit of the copyright system. To understand whether and how the copyright system should apply in an increasingly digital world, it is first necessary to understand doctrinally how current copyright laws apply to new digital works. This Article corrects several errors that have appeared in the literature analyzing copyright law\u27s treatment of 3D printing and other digital manufacturing files. This Article incorporates an advanced technical understanding of digital manufacturing files and applies that understanding to copyright doctrine to clarify misunderstandings. The analysis briefly confirms that digital files created to manufacture creative objects are themselves clearly protected by copyright. On the other hand, and contrary to several assertions in the literature, most files created to manufacture purely utilitarian objects are not copyrightable because they lack a modicum of creativity. The lack of copyright protection for these files calls into question a number of assumptions, including whether they can be protected against even verbatim copying and whether open-source licenses involving these files can efficaciously bind downstream users. If digital manufacturing files of purely utilitarian objects do not enjoy copyright protection, creators may seek to embed additional, ancillary copyrightable material in the files to secure protection. This ancillary material serves as a lock-out code, which tries to prevent what would otherwise be lawful copying. This Article analyzes that phenomenon and discusses potential ways the law may react to it

An experimental investigation of the hypergolic ignition of some polymeric fuels with oxygen

Hypergolic ignition of polymeric fuels with oxyge