Radial evolution of power spectra of interplanetary Alfvenic turbulence

The radial evolution of the power spectra of the MHD turbulence within the trailing edge of high speed streams in the solar wind was investigated with the magnetic field data of Helios 1 and 2 for heliocentric distance between 0.3 and 0.9 AU. In the analyzed frequency range (.00028 Hz to .0083 Hz) the computed spectra have, near the Earth, values of the spectral index close to that predicted for an incompressible hydromagnetic turbulence in a stationary state. Approaching the Sun the spectral slope remains unchanged for frequencies f or approximately .00 Hz, whereas at lower frequencies, a clear evolution toward a less steep fall off with frequency is found. The radial gradient of the power in Alfvenic fluctuations depends on frequency and it increases upon increasing frequency. For frequencies f or approximately .00 Hz, however, the radial gradient remains approximately the same. Possible theoretical implications of the observational features are discussed

Kecernaan dan Produk Fermentasi Rumen (In Vitro) Ransum Sapi Bali Induk dengan Level Energi Berbeda

Penelitian bertujuan untuk mengetahui kecernaan dan produk fermentasi rumen secara in vitro ransum sapi Baliinduk dengan level energi berbeda. Ransum disusun iso protein dengan level energi berbeda. Rancangan percobaanyang digunakan adalah rancangan acak lengkap (RAL) dengan empat perlakuan dan tiga ulangan. Adapunperlakuan tersebut adalah perlakuan A: ransum dengan protein 9% dan energi 2000 kkal/kg, perlakuan B: ransumdengan protein 9% dan energi 2150 kkal/kg, perlakuan C: ransum dengan protein 9% dan energi 2300 kkal/kg, danperlakuan D: ransum dengan protein 9% dan energi 2450 kkal/kg. Peubah yang diukur adalah kecernaan bahankering dan bahan organik, produk fermentasi (pH, NNH3, dan VFA total) rumen. Hasil penelitian menunjukkanbahwa kecernan bahan kering, bahan organik, pH, NNH3 dan VFA total pada fermentasi 4 jam tidak menunjukkanperbedaan yang nyata diantara perlakuan. Level energi berpengaruh terhadap kecernaan bahan kering, bahanorganik, pH, NNH3 dan VFA total pada fermentasi 24 jam. Hasil penelitian menyimpulkan bahwa kecernaan bahankering dan bahan organik, NNH3 dan VFA total tertinggi pada fermentasi 24 jam pada perlakuan B yaitu 42,87%;45,40%; 3,91mMol dan 98,18 mMol

Asymmetric Franck-Condon factors in suspended carbon nanotube quantum dots

Electronic states and vibrons in carbon nanotube quantum dots have in general different location and size. As a consequence, the conventional Anderson-Holstein model, coupling vibrons to the dot total charge only, may no longer be appropriated in general. Here we explicitly address the role of the spatial fluctuations of the electronic density, yielding space-dependent Franck-Condon factors. We discuss the consequent marked effects on transport which are compatible with recent measurements. This picture can be relevant for tunneling experiments in generic nano-electromechanical systems.Comment: 4+ pages, 3 figures (2 color, 1 BW

Magnetic dips in the solar wind

Using magnetic data from the HELIOS 1 fluxgate magnetometer, with a 0.2 sec resolution, the structures of several interplanetary discontinuities involving magnetic dips and rotations of the magnetic field vector were investigated. A minimum variance analysis illustrates the behavior of the magnetic field through the transition in the plane of its maximum variation. Using this analysis, quite different structures have been individuated and, in particular, narrow transitions resembling almost one dimensional reconnected neutral sheets. For the thinner cases (scale lengths of the magnetic rotation of the order or smaller than 1,000 km), results show the observed structures could be the nonlinear effect of a resistive tearing mode instability having developed on an originally one dimensional neutral sheet at the solar corona

Numerical Implementation of lepton-nucleus interactions and its effect on neutrino oscillation analysis

We discuss the implementation of the nuclear model based on realistic nuclear spectral functions in the GENIE neutrino interaction generator. Besides improving on the Fermi gas description of the nuclear ground state, our scheme involves a new prescription for $Q^2$ selection, meant to efficiently enforce energy momentum conservation. The results of our simulations, validated through comparison to electron scattering data, have been obtained for a variety of target nuclei, ranging from carbon to argon, and cover the kinematical region in which quasi elastic scattering is the dominant reaction mechanism. We also analyse the influence of the adopted nuclear model on the determination of neutrino oscillation parameters.Comment: 19 pages, 35 figures, version accepted by Phys. Rev.