102 research outputs found
DUAL ROLE OF FORBS AND RODENTICIDES IN THE GROUND SPRAY CONTROL OF PINE MICE
Highly effective controls for the pine mouse (Pitymys pinetorum) were obtained for three years in apple orchards by means of herbaceous ground cover sprays of [(chloro 4 phenyl) 1 phenyl] acetyl 2 dioxo 1-3 indane at a rate of 0.2 lb. per acre of actual orchard. This toxicant from Europe is designated there as chlorophacinone. The spray residue persists for a maximum of about 30 days and was not found to be translocated to fruits nor was it detected in runoff water. Ingestion of the lethal agent is markedly enhanced by an adequate presence of forbs in the treated greenery. Too little attention has been directed to the basic differences in control between herbaceous type feeders and the seed consumers. CPN is now reported to give excellent results from large-scale applications by growers
Persistent Currents in Small, Imperfect Hubbard Rings
We have done a study with small, imperfect Hubbard rings with exact
diagonalization. The results for few-electron rings show, that the
imperfection, whether localized or not, nearly always decrease, but can also
\emph{increase} the persistent current, depending on the character of the
imperfection and the on-site interaction. The calculations are generally in
agreement with more specialized studies. In most cases the electron spin plays
an important role.Comment: 6 pages, 4 figure
A Low Complexity Scheme for Entanglement Distributor Buses
For technological purposes and theoretical curiosity, it is very interesting
to have a building block that produces a considerable amount of entanglement
between on-demand sites through a simple control of a few sites. Here, we
consider permanently-coupled spin networks and study entanglement generation
between qubit pairs to find low-complexity structures capable of generating
considerable entanglement between various qubit pairs. We find that in axially
symmetric networks the generated entanglement between some qubit pairs is
rather larger than generic networks. We show that in uniformly-coupled spin
rings each pair can be considerably entangled through controlling suitable
vertices. To set the location of controlling-vertices, we observe that the
symmetry has to be broken for a definite time. To achieve this, a magnetic flux
can be applied to break symmetry via Aharonov-Bohm effect. Such a set up can
serve as an efficient entanglement distributor bus in which each vertex-pair
can be efficiently entangled through exciting only one fixed vertex and
controlling the evolution time. The low-complexity of this scheme makes it
attractive for use in nanoscale quantum information processors.Comment: 23 pages, 4 figures, Major revision, title changed, published versio
Choice of tracers for the evaluation of spray deposits
Tracer substances, used to evaluate spraying effectiveness, ordinarily modify the surface tension of aqueous solutions. This study aimed to establish a method of using tracers to evaluate distribution and amount of spray deposits, adjusted to the surface tension of the spraying solution. The following products were tested: 0.15% Brilliant Blue, 0.15% Saturn Yellow in 0.015% Vixilperse lignosulfonate, and 0.005% sodium fluorescein, and mixtures of Brilliant Blue plus Saturn Yellow and Brilliant Blue plus sodium fluorescein at the same concentrations. Solutions were deposited on citrus leaves and stability was determined by measuring fluorescence and optical density of solutions without drying, dried in the dark and exposed to sunlight for 2, 4 and 8 h. These values were compared to those obtained directly in water. The static surface tension of the tracer solution was determined by weighing droplets formed during a period of 20 to 40 seconds. The Brilliant Blue and Saturn Yellow mixture at 0.15% was stable under all conditions tested. It was not absorbed by the leaves and maintained the same surface tension as that of water, thus permitting concentration adjustment to the same levels used for agrochemical products, and allowing the development of a qualitative method based on visual evaluation of the distribution of the pigment under ultraviolet light and of a quantitative method based on the determination of the amount of the dye deposited in the same solution. Spray deposition could be evaluated at different surface tensions of the spraying solution, simulating the effect of agrochemical formulations
GIBBERELLIC ACID REDUCES FLOWERING AND TIME OF MANUAL THINNING IN ‘MACIEL’ PEACH TREES
Field response of spruce bark beetle,Ips typographus, to aggregation pheromone candidates
Eficácia do tratamento de avg no controle da queda e maturação dos frutos de maçã, cultivar imperial gala
Maçã 'Gala' armazenada em atmosfera controlada e tratada com aminoetoxivinilglicina e ethephon
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