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Microscopic control ofSi29nuclear spins near phosphorus donors in silicon
Jä,rvinen, J.,Zvezdov, D.,Ahokas, J.,Sheludyakov, S.,Vainio, O.,Lehtonen, L.,Vasiliev, S.,Fujii, Y.,Mitsudo, S.,Mizusaki, T.,Gwak, M.,Lee, SangGap,Lee, Soonchil,Vlasenko, L. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.12
Jä,ger, K.,Bartó,k, T.,Ö,rdö,g, V.,Barnabá,s, B. Elsevier 2010 South African journal of botany : official journal Vol.76 No.3
<P><B>Abstract</B></P><P>This is the first report on the beneficial effect of microalgal and cyanobacterial biomass on anther cultures of maize (<I>Zea mays</I> L.). Investigations were made on the cytokinin- and auxin-like activity and content of terrestrial and fresh-water living microalgal and cyanobacterial strains. The influence of media supplemented with biomass from four selected strains on the anther induction, the frequency of microspore-derived embryo-like structures, and regeneration capacity in anther cultures of maize was also studied. The addition of cyanobacterial and microalgal biomass to the induction and regeneration media in concentrations of 1 or 2g/L improved the androgenic response, and was able to reduce the quantity of the synthetic auxin 2,4-dichlorophenoxy-acetic acid (2,4-D) required, or replace it completely.</P>
MEASUREMENTS OF THE CORONAL ACCELERATION REGION OF A SOLAR FLARE
Krucker, Sä,m,Hudson, H. S.,Glesener, L.,White, S. M.,Masuda, S.,Wuelser, J.-P.,Lin, R. P. IOP Publishing 2010 The Astrophysical journal Vol.714 No.2
<P>The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and the Nobeyama Radioheliograph (NoRH) are used to investigate coronal hard X-ray and microwave emissions in the partially disk-occulted solar flare of 2007 December 31. The STEREO mission provides EUV images of the flare site at different viewing angles, establishing a two-ribbon flare geometry and occultation heights of the RHESSI and NoRH observations of similar to 16 Mm and similar to 25 Mm, respectively. Despite the occultation, intense hard X-ray emission up to similar to 80 keV occurs during the impulsive phase from a coronal source that is also seen in microwaves. The hard X-ray and microwave source during the impulsive phase is located similar to 6 Mm above thermal flare loops seen later at the soft X-ray peak time, similar in location to the above-the-loop-top source in the Masuda flare. A single non-thermal electron population with a power-law distribution (with spectral index of similar to 3.7 from similar to 16 keV up to the MeV range) radiating in both bremsstrahlung and gyrosynchrotron emission can explain the observed hard X-ray and microwave spectrum, respectively. This clearly establishes the non-thermal nature of the above-the-loop-top source. The large hard X-ray intensity requires a very large number (>5 x 10(35) above 16 keV for the derived upper limit of the ambient density of similar to 8 x 10(9) cm(-3)) of suprathermal electrons to be present in this above-the-loop-top source. This is of the same order of magnitude as the number of ambient thermal electrons. We show that collisional losses of these accelerated electrons would heat all ambient electrons to superhot temperatures (tens of keV) within seconds. Hence, the standard scenario, with hard X-rays produced by a beam comprising the tail of a dominant thermal core plasma, does not work. Instead, all electrons in the above-the-loop-top source seem to be accelerated, suggesting that the above-the-loop-top source is itself the electron acceleration region.</P>
Hybrid circuit cavity quantum electrodynamics with a micromechanical resonator
Pirkkalainen, J.-M.,Cho, S. U.,Li, Jian,Paraoanu, G. S.,Hakonen, P. J.,Sillanpä,ä,, M. A. Nature Publishing Group, a division of Macmillan P 2013 Nature Vol.494 No.7436
Hybrid quantum systems with inherently distinct degrees of freedom have a key role in many physical phenomena. Well-known examples include cavity quantum electrodynamics, trapped ions, and electrons and phonons in the solid state. In those systems, strong coupling makes the constituents lose their individual character and form dressed states, which represent a collective form of dynamics. As well as having fundamental importance, hybrid systems also have practical applications, notably in the emerging field of quantum information control. A promising approach is to combine long-lived atomic states with the accessible electrical degrees of freedom in superconducting cavities and quantum bits (qubits). Here we integrate circuit cavity quantum electrodynamics with phonons. Apart from coupling to a microwave cavity, our superconducting transmon qubit, consisting of tunnel junctions and a capacitor, interacts with a phonon mode in a micromechanical resonator, and thus acts like an atom coupled to two different cavities. We measure the phonon Stark shift, as well as the splitting of the qubit spectral line into motional sidebands, which feature transitions between the dressed electromechanical states. In the time domain, we observe coherent conversion of qubit excitation to phonons as sideband Rabi oscillations. This is a model system with potential for a quantum interface, which may allow for storage of quantum information in long-lived phonon states, coupling to optical photons or for investigations of strongly coupled quantum systems near the classical limit.
White, J S,Forgan, E M,Laver, M,Hä,fliger, P S,Khasanov, R,Cubitt, R,Dewhurst, C D,Park, M-S,Jang, D-J,Lee, H-G,Lee, S-I IOP Pub 2008 Journal of physics, an Institute of Physics journa Vol.20 No.10
<P>We report on the first small-angle neutron scattering measurements from the flux line lattice (FLL) in the high-<I>T</I><SUB>c</SUB> cuprate superconductor Sr<SUB>0.9</SUB>La<SUB>0.1</SUB>CuO<SUB>2</SUB>. Using a polycrystalline sample, the scattered intensity decreases monotonically with scattering angle away from the undiffracted beam, independently of the azimuthal angle around the beam. The absence of clear peaks in the intensity suggests the establishment of a highly disordered FLL within the grains. We find that the intensity distribution may be represented by the form factor for a single flux line in the London approximation, with some contribution from crystal anisotropy. Most interestingly however, we find that, over the observed field range, the temperature dependence of the diffracted intensity is best represented by s-wave pairing, with lower limits of the gap values being very similar to the Bardeen–Cooper–Schrieffer value of Δ(0) = 1.76<I> k</I><SUB>B</SUB><I>T</I><SUB>c</SUB>. However, a qualitative consideration of corrections to the observed intensity suggests that these gap values are likely to be higher, implying strong-coupling behaviour.</P>
First 230 GHz VLBI fringes on 3C 279 using the APEX Telescope
Wagner, J.,Roy, A. L.,Krichbaum, T. P.,Alef, W.,Bansod, A.,Bertarini, A.,Gü,sten, R.,Graham, D.,Hodgson, J.,Mä,rtens, R.,Menten, K.,Muders, D.,Rottmann, H.,Tuccari, G.,Weiss, A.,Wieching, G.,W EDP Sciences 2015 Astronomy and astrophysics Vol.581 No.-
Final report on CCQM-K125: elements in infant formula
Merrick, J,Saxby, D,Dutra, E S,Sena, R C,Araú,jo, T O,Almeida, M D,Yang, L,Pihillagawa, I G,Mester, Z,Sandoval, S,Wei, C,Castillo, M E D,Oster, C,Fisicaro, P,Rienitz, O,Pape, C,Schulz, U,Jä BUREAU INTERNATIONAL DES POIDS ET MESURES 2017 METROLOGIA -BERLIN- Vol.54 No.1
MEGAMASER DISKS REVEAL A BROAD DISTRIBUTION OF BLACK HOLE MASS IN SPIRAL GALAXIES
Greene, J. E.,Seth, A.,Kim, M.,Lä,sker, R.,Goulding, A.,Gao, F.,Braatz, J. A.,Henkel, C.,Condon, J.,Lo, K. Y.,Zhao, W. American Astronomical Society 2016 ASTROPHYSICAL JOURNAL LETTERS - Vol.826 No.2
<P>We use new precision measurements of black hole (BH) masses from water megamaser disks to investigate scaling relations between macroscopic galaxy properties and supermassive BH mass. The megamaser-derived BH masses span 10(6)-10(8) M-circle dot, while all the galaxy properties that we examine (including total stellar mass, central mass density, and central velocity dispersion) lie within a narrower range. Thus, no galaxy property correlates tightly with M-BH in similar to L* spiral galaxies as traced by megamaser disks. Of them all, stellar velocity dispersion provides the tightest relation, but at fixed sigma* the mean megamaser M-BH are offset by -0.6 +/- 0.1 dex relative to early-type galaxies. Spiral galaxies with non-maser dynamical BH masses do not appear to show this offset. At low mass, we do not yet know the full distribution of BH mass at fixed galaxy property; the non-maser dynamical measurements may miss the low-mass end of the BH distribution due to an inability to resolve their spheres of influence and/or megamasers may preferentially occur in lower-mass BHs.</P>