661 research outputs found
Soil Nutrient Availability, Plant Nutrient Uptake, and Wild Blueberry (Vaccinium angustifolium Ait.) Yield in Response to N-Viro Biosolids and Irrigation Applications
No full textWe compared the impact of surface broadcasted N-Viro biosolids and inorganic fertilizer (16.5% Ammonium sulphate, 34.5% Diammonium phosphate, 4.5% Potash, and 44.5% s and/or clay filler) applications on soil properties and nutrients, leaf nutrient concentration, and the fruit yield of lowbush blueberry under irrigated and nonirrigated conditions during 2008-2009 at Debert, NS, Canada. Application rates of N-Viro biosolids were more than double of inorganic fertilizer applied at a recommended N rate of 32 kg ha−1. The experimental treatments NI: N-Viro with irrigation, FI: inorganic fertilizer with irrigation, N: N-Viro without irrigation, and F: inorganic fertilizer without irrigation (control) were replicated four times under a randomized complete block design. The NI treatment had the highest OM (6.68%) followed by FI (6.32%), N (6.18%), and F (4.43%) treatments during the year 2008. Similar trends were observed during 2009 with the highest soil OM values (5.50%) for NI treatment. Supplemental irrigation resulted in a 21% increase in the ripe fruit yield. Nonsignificant effect of fertilizer treatments on most of the nutrient concentrations in soil and plant leaves, and on ripe fruits yield reflects that the performance of N-Viro was comparable with that of the inorganic fertilizer used in this study
Interview: Anne-Marie Fortier
No full textThis paper is an edited version of an email interview conducted by Debra Ferreday and Adi Kuntsman with Anne-Marie Fortier, the author of Multicultural Horizons: Diversity and the Limits of the Civil Nation (Routledge, 2008). Fortier’s work has been informative in the development of some of the arguments explored in this special issue; in their conversation Ferreday and Kuntsman asked her to comment on the ideas of haunting, racial imaginaries, nostalgia, national anxieties, political feelings and hopes for the future
Ceratolithus Acutus Gartner and Bukry, N. Sp. and Ceratolithus Amplificus Bukry and Percival- Nomenclatural Clarification
No full textThe calcareous nannofossil Ceratolithus acutus Gartner and Bukry n.sp., is a birefringent certatolith from early Pliocene sediment. It is distinct from Ceratolithus amplificus Bukry and Percival, the holotype of which is from late Miocene sediment. Ceratolithus dentatus Bukry is a junior synonym of C. amplificus
Classical and quantum chaos of dynamical systems: rotating billiards
No full textThe theory of classical chaos is reviewed. From the definition of integrable systems using the Hamilton-Jacobi equation, the theory of perturbed systems is developed and the Kolmogorov-Arnold-Moser (KAM) theorem is explained. It is shown how chaotic motion in Hamiltonian systems is governed by the in tricate connections of stable and unstable invariant manifolds, and how it can be catagorised by algorithmic complexity and symbolic dynamics, giving chaotic measures such as Lyapunov exponents and Kolmogorov entropy. Also reviewed is Gutzwiller's semiclassical trace formula for strongly chaotic systems, torus quantisation for integrable systems, the asymptotic level density for stationary billiards, and random matrix theories for describing spectral fluctuation properties. The classical theory is applied to rotating billiards, particularly the free motion of a particle in a circular billiard rotating uniformly in its own plane about a point on its edge. Numerically, it is shown that the system's classical behaviour ranges from fully chaotic at intermediate energies, to completely integrable at very low and very high energies. It is shown that the strong chaos is due to discontinuities in the Poincare map, caused by trajectories which just glance the boundary-an effect of the curvature of trajectories. Weaker chaos exists due to the usual folding and stretching of the Hamiltonian flow. Approximate invariant curves for integrable motion are found, valid far from the presence of glancing trajectories. The major structures of phase space are investigated: a fixed point and its bifurcation into a two-cycle, and their stabilities. Lyapunov exponents for trajectories are calculated and the chaotic volume for a wide range of energies is measured. Quantum mechanically, the energy spectrum of the system is found numerically. It is shown that at the energies where the classical system is completely integrable the levels do not repel, and at those energies where it is completely chaotic there is strong level repulsion. The nearest neighbour level spacing distributions for various ranges of energy and values of Planck's constant are found. In the semiclassical limit, it is shown that, for energies where the classical system is completely chaotic, the level spacing statistics are Wigner, and where it is completely integrable, the level spacing statistics are Poisson. A model is described for the spacing distributions where the levels can be either Wigner or Poisson, which is useful for showing the transition from one to the other, and ad equately describes the statistics. Theoretically, the asymptotic level density for rotating billiards is calculated, and this is compared with the numerical results with good agreement, after modification of the method to include all levels
Temperature dependence of the muon and proton hyperfine constants of an \alpha‐muonium‐substituted methyl radical
No full textMuon hyperfine constants A_μ have been measured by transverse field μSR for (CH3)3Si\mbox\.CHMu in hexane from 167 K to 332 K. In addition, avoided level‐crossing resonance was used to determine \alpha‐proton coupling constants Ap over a similar range of temperatures. The two hyperfine constants can be described by a common temperature dependence, d|Ai|/ dT=1.4\times 10-3 MHz\,K-1, where Ai represents Ap or the reduced muon constant A^\prime_μ=0.3141A_μ. There is a small isotope effect (A^\prime_μ is 2.2 % larger than Ap) consistent with zero‐point motion in the anharmonic C–H bond stretch. The common temperature dependence is tentatively attributed to a coupled deviation of the C–H and C–Mu bonds out of the nodal plane of the p orbital containing the unpaired electron.Peer reviewedFinal article publishedMuon Spin RotationNodal PlaneEthylsilaneBond StretchDiamagnetic Signa
Guidebook for Pre-conference North Island Field Trip A1 ‘Ashes to Issues’, 28-30 November, 2008
No full textWelcome to New Zealand or Aotearoa – „Land of the long lingering day [twilight]‟ – and to our three-day pre-conference North Island field trip „Ashes and Issues‟. We trust your stay in New Zealand is both informative and friendly and there is something for everyone on the trip. The itinerary in brief and a map of the North Island showing the main scientific stops are shown above. At the time of guidebook preparation, we have a group of 23, including four students, on the tour with participants from Japan, Taiwan, USA, UK, Australia and New Zealand. The tour leaders are Prof David Lowe (Univ. of Waikato, Hamilton) and Dr Haydon Jones (Scion Research, Rotorua). Assistant leader is Prof Paul McDaniel (Univ. of Idaho, Moscow), on leave at the Univ. of Waikato July-December, 2008. We offer a warm welcome to you all. Because we have considerable distances to travel (especially Day 3), as well as a range of stops planned, we will need to leave the hotel at 8.00 am each day
Lasing characteristics of ytterbium, thulium and other rare-earth doped silica-based fibres
No full textWe have experimentally studied the lasing characteristics of silica fibers doped with Yb, Tm, Pr and Ho and present a summary of these result
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