Performance of new forage varieties for grazing

Non-Peer ReviewedSaskatchewan beef producers require forage varieties that are high yielding, of good nutritional quality and persist in western Canada. New forage varieties require evaluation under grazed conditions to determine suitability for grazing purposes. A grazing trial near Lanigan, Saskatchewan evaluated crested wheatgrass (CWG) (Agropyron cristatum (L.) Gaertn.) cv. ‘Goliath’, meadow bromegrass (MBG) (Bromus riparius Rehm.) cv. ‘Paddock’, smooth bromegrass (SBG) (B. inermis Leyss) cv. ‘Carlton’, hybrid bromegrass (HBG) (B. riparius Rehm. X B. inermis Leyss) cv. ‘AC Knowles’ and tall fescue (TF) (Festuca arundinacea Schreb.) cv. ‘Courtney’ compared to an old established stand of CWG (A. cristatum) for cumulative dry matter yield (CDMY), average daily gain (ADG) of yearling steers, animal grazing days (AGD) and total beef production per hectare (TBP). There was no significant species x year interaction for ADG, AGD and TBP and data was analyzed using the mean of 2004 and 2005. In 2005, CWG cv. ‘Goliath’ yielded significantly higher (p<0.05) than all other varieties. The long established CWG showed higher ADG than HBG established in 2003 (p<0.05) but was not significantly different than the other varieties. The long established stand of CWG had the lowest AGD, while TF, MBG and HBG had the greatest animal grazing days (p<0.05). Tall fescue, MBG, HBG, SBG and CWG cv. ‘Goliath’ yielded higher TBP than the long established stand of crested wheatgrass (p<0.05). New forage varieties have the potential to perform better than long established stands of crested wheatgrass

Radioactive Decay Studies of Nuclei Produced from Bombardment by Intermediate Energy Neutrons

This work was supported by National Science Foundation Grants PHY 76-84033A01, PHY 78-22774, and Indiana Universit

Radioactive Decay Studies of Nuclei Produced from Bombardment by Intermediate-Energy Neutrons

This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit

Studies of 49≤Z≤51 and N≥50 Nuclei at Intermediate Energies

This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit

Radioactive Decay Studies of Nuclei Produced from Bombardment by Intermediate-Energy Neutrons

This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit

Experimental evidence for the dynamic Jahn-Teller effect in La\u3csub\u3e0.65\u3c/sub\u3eCa\u3csub\u3e0.35\u3c/sub\u3eMnO\u3csub\u3e3\u3c/sub\u3e

Recently, it has been argued that a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn d level plays a crucial role in understanding the nonmetal-to-metal transition observed in the La1-xAxMnO3 (A=Ca, Sr, Ba) system. We show, by neutron powder diffraction, that La0.65Ca0.35MnO3 exhibits an anomalous volume and oxygen/manganese displacement change around Tc, in qualitative agreement with the theoretical prediction

Multiphase induction motor drives - a technology status review

The area of multiphase variable-speed motor drives in general and multiphase induction motor drives in particular has experienced a substantial growth since the beginning of this century. Research has been conducted worldwide and numerous interesting developments have been reported in the literature. An attempt is made to provide a detailed overview of the current state-of-the-art in this area. The elaborated aspects include advantages of multiphase induction machines, modelling of multiphase induction machines, basic vector control and direct torque control schemes and PWM control of multiphase voltage source inverters. The authors also provide a detailed survey of the control strategies for five-phase and asymmetrical six-phase induction motor drives, as well as an overview of the approaches to the design of fault tolerant strategies for post-fault drive operation, and a discussion of multiphase multi-motor drives with single inverter supply. Experimental results, collected from various multiphase induction motor drive laboratory rigs, are also included to facilitate the understanding of the drive operatio

Theory of Kondo lattices and its application to high-temperature superconductivity and pseudo-gaps in cuprate oxides

A theory of Kondo lattices is developed for the t-J model on a square lattice. The spin susceptibility is described in a form consistent with a physical picture of Kondo lattices: Local spin fluctuations at different sites interact with each other by a bare intersite exchange interaction, which is mainly composed of two terms such as the superexchange interaction, which arises from the virtual exchange of spin-channel pair excitations of electrons across the Mott-Hubbard gap, and an exchange interaction arising from that of Gutzwiller's quasi-particles. The bare exchange interaction is enhanced by intersite spin fluctuations developed because of itself. The enhanced exchange interaction is responsible for the development of superconducting fluctuations as well as the Cooper pairing between Gutzwiller's quasi-particles. On the basis of the microscopic theory, we develop a phenomenological theory of low-temperature superconductivity and pseudo-gaps in the under-doped region as well as high-temperature superconductivity in the optimal-doped region. Anisotropic pseudo-gaps open mainly because of d\gamma-wave superconducting low-energy fluctuations: Quasi-particle spectra around (\pm\pi/a,0) and (0,\pm\pi/a), with a the lattice constant, or X points at the chemical potential are swept away by strong inelastic scatterings, and quasi-particles are well defined only around (\pm\pi/2a,\pm\pi/2a) on the Fermi surface or line. As temperatures decrease in the vicinity of superconducting critical temperatures, pseudo-gaps become smaller and the well-defined region is extending toward X points. The condensation of d\gamma-wave Cooper pairs eventually occurs at low enough temperatures when the pair breaking by inelastic scatterings becomes small enough.Comment: 15 pages, 14 figure

All-optical switching and strong coupling using tunable whispering-gallery-mode microresonators

We review our recent work on tunable, ultrahigh quality factor whispering-gallery-mode bottle microresonators and highlight their applications in nonlinear optics and in quantum optics experiments. Our resonators combine ultra-high quality factors of up to Q = 3.6 \times 10^8, a small mode volume, and near-lossless fiber coupling, with a simple and customizable mode structure enabling full tunability. We study, theoretically and experimentally, nonlinear all-optical switching via the Kerr effect when the resonator is operated in an add-drop configuration. This allows us to optically route a single-wavelength cw optical signal between two fiber ports with high efficiency. Finally, we report on progress towards strong coupling of single rubidium atoms to an ultra-high Q mode of an actively stabilized bottle microresonator.Comment: 20 pages, 24 figures. Accepted for publication in Applied Physics B. Changes according to referee suggestions: minor corrections to some figures and captions, clarification of some points in the text, added references, added new paragraph with results on atom-resonator interactio