RESEARCH REGARDING THE INTEGRATE MANAGEMENT OF THE VINE MOTH (Lobesia botrana Den et Schiff.) AT THE DEALURILE CRAIOVEI VINEYARD

The vine moth Lobesia botrana Den et Schifff. Is one of the main pest of the Dealurile Craiovei vineyard, the damages produced by this pest can reach 25-30%. The integrate management of the vine moth is an alternative to the excessive chemification in order to control the viticultural ecosystem during the past years, this paper frame within this curent. During 2004-2006, the climatic conditions has been favourable for the develop of the Lobesia botrana species, in 2004 there has been recorded 4 maximum flights coresponding to 3 complete generations and the fourth one incomplete, in 2005 and 2006 there has been recorded 3 maximum flights coresponding for same number of generations. The attack medium frequency, of the vine moth, recorded in 2004 has been of 20,66%, 19,0% in 2005, and of 17,83% in 2006. The attack medium frequency during 2004-2006 has been of 19,2% . The efficiency of the control treatments has been ranged between 94,6% and 89,4%. The highest efficiency of 94,6% has been recorded at the V2 variant, there has been used only chemical products, followed by the V3 variant (91,4%) there has been used chemical products for controling the first 2 generations I and II of the vine moth and an biological product for the third generation III, and the fourth variant V4 (89,7%) there has been used the pyretroid product Bulldock 025 EC for controling the first generation, and the biological product Foray 48B (Biobit XL) for controling the second generation II and 8 pheromonals traps (atraBOT/ha) for controling the third generation III. For the fifth variant V5 there has been used the product Calypso 480 SC, an metamorphosis inhibitor for the arthropods, for controling the first generation and then the biological product Dipel 2xWP for the second generation II and 8 pheromonals traps (atraBOT/ha) for the third generation, at this variant there has been recorded the lowest efficiencyt 89,4%

THE EFFECT OF SOME INSECTICIDES ON THE LADY BUG (Coccinella 7-punctata L.)

In Romania unfortunatly the use of insecticides for controling the pest it’s made without any respect for the beneficial fauna. One of the most known beneficial species encountered in almost any agricultural biotope it’s the lady bug Coccinella 7 punctata. The lady bug Coccinella 7 punctata it’s an predatory species that fed especially on aphids species and play an essential role in the biological control of these species. This paper present the research regarding the effect of some insecticides used for controling the mealy plum aphid Hyalopterus pruni Geoffr., to the lady bug Coccinella 7 punctata in the conditions from central Oltenia, at the Banu Maracine Didactical Station. The experience has been set up during 2005 - 2006, in a plum orchard from the Banu Maracine Didactical Station, of the University of Craiova. In order to study the effect of some insecticides on the lady bug there has been made observation in orchards as well in laboratory conditions.  The direct toxic action of the insecticides on the lady bug has been esatblished in field at 24, 48 and 72 hours after the apply of the treatments, counting the dead larva and adults. The effect of the insecticides through feeding with intoxicated aphids, has been establish in laboratory at 24, 48 and 72 hours

THE BIOLOGICAL CYCLE OF THE PLUM MEALY APHID (Hyalopterus pruni Geoffr.) ON THE CLIMATIC CONDITIONS FROM S.D. BANU MĂRĂCINE, CRAIOVA

The plum mealy aphid Hyalopterus pruni Geoffr. is one of the main pest of the plum orchard at the S. D. Banu Maracine. An important link for controling this pest is the knowledge of the biological cycle, in order to establish the best moment for the treatments. The plum mealy aphid is an migratory species, with an holocyclic, dioecious development. This species produce damages in the plum orchard from Europe, Asia and northern Africa. The main host plant is the plum tree or other species belonging to the Prunus genra and as secondary host the plum mealy aphid prefere different graminaceae species as: Phragmites, Calamagrostis, Agrostis, etc. The research regarding the biology and ecology of the plum mealy aphid has been made at the Didactical Station Banu Maracine, Craiova, in a plum orchard, Stanley variety. During the 3 years of research the period for layings eggs has oscilated between 23 days in 2004 and 31days in 2002.The development of the fundatrix, has been framed between 24 days in 2004 and 29 days in 2003. In 2002 the development of the fundatrix has been completed after 26 days. During the climatic conditions of 2002-2004, there has been developed 4 generations of wingless aphid (2002 and 2004), respectively 5 generations in 2003. These 4, 5 generations have phased from the second or third decade of April untill the second half of July. From our observations regarding the development on the secondary host plants, it come out that the first generation has completed it development, function the climatic conditions, in 7 to 11 days. There has been phased 8-9 generations of winged and wingless form, untill September and even October. The last generation has ensured the appearance of the sexuparae form, which has migrated in the plum orchard and give birth to the sexuale forms. The laying of hibernating eggs, begun in October, phasing to the first decade of November

Discrete exterior calculus (DEC) for the surface Navier-Stokes equation

We consider a numerical approach for the incompressible surface Navier-Stokes equation. The approach is based on the covariant form and uses discrete exterior calculus (DEC) in space and a semi-implicit discretization in time. The discretization is described in detail and related to finite difference schemes on staggered grids in flat space for which we demonstrate second order convergence. We compare computational results with a vorticity-stream function approach for surfaces with genus 0 and demonstrate the interplay between topology, geometry and flow properties. Our discretization also allows to handle harmonic vector fields, which we demonstrate on a torus.Comment: 21 pages, 9 figure

A Comparison between Neural Networks and Traditional Forecasting Methods: A Case Study

Forecasting accuracy drives the performance of inventory management. This study is to investigate and compare different forecasting methods like Moving Average (MA) and Autoregressive Integrated Moving Average (ARIMA) with Neural Networks (NN) models as Feed-forward NN and Nonlinear Autoregressive network with eXogenous inputs (NARX). Data used to forecast is acquired from inventory database of Panasonic Refrigeration Devices Company located in Singapore. Results have shown that forecasting with NN offers better performance in comparison with traditional methods

Integral potential method for a transmission problem with Lipschitz interface in R^3 for the Stokes and Darcy–Forchheimer–Brinkman PDE systems

The purpose of this paper is to obtain existence and uniqueness results in weighted Sobolev spaces for transmission problems for the non-linear Darcy-Forchheimer-Brinkman system and the linear Stokes system in two complementary Lipschitz domains in R3, one of them is a bounded Lipschitz domain with connected boundary, and the other one is the exterior Lipschitz domain R3 n. We exploit a layer potential method for the Stokes and Brinkman systems combined with a fixed point theorem in order to show the desired existence and uniqueness results, whenever the given data are suitably small in some weighted Sobolev spaces and boundary Sobolev spaces

A Survey on the Krein-von Neumann Extension, the corresponding Abstract Buckling Problem, and Weyl-Type Spectral Asymptotics for Perturbed Krein Laplacians in Nonsmooth Domains

In the first (and abstract) part of this survey we prove the unitary equivalence of the inverse of the Krein--von Neumann extension (on the orthogonal complement of its kernel) of a densely defined, closed, strictly positive operator, $S\geq \varepsilon I_{\mathcal{H}}$ for some $\varepsilon >0$ in a Hilbert space $\mathcal{H}$ to an abstract buckling problem operator. This establishes the Krein extension as a natural object in elasticity theory (in analogy to the Friedrichs extension, which found natural applications in quantum mechanics, elasticity, etc.). In the second, and principal part of this survey, we study spectral properties for $H_{K,\Omega}$, the Krein--von Neumann extension of the perturbed Laplacian $-\Delta+V$ (in short, the perturbed Krein Laplacian) defined on $C^\infty_0(\Omega)$, where $V$ is measurable, bounded and nonnegative, in a bounded open set $\Omega\subset\mathbb{R}^n$ belonging to a class of nonsmooth domains which contains all convex domains, along with all domains of class $C^{1,r}$, $r>1/2$.Comment: 68 pages. arXiv admin note: extreme text overlap with arXiv:0907.144