Noi strategii de prevenire şi combatere a bolilor şi dăunătorilor la specia cireş

The research was carried out within the SCDP Iasi, in order to test ecological alternatives regarding the control of diseases and pests in the cherry species. The observations were made in 2019 having as research material 2 varieties of cherry (CĂTĂLINA, MARIA), grafted on mahaleb, the planting distance of 5X4 being in year VII from planting, the experience was placed on 4 experimental variants.The climatic conditions of this period were particularly favorable both for the evolution of the attack of the diseases (anthracnose and monilosis) and for pests. In the fight against diseases (moniliasis and anthracnose) the best results were obtained in the case of the chemical variant with Signum products 0.03%, Folicur Solo 0.075%, Mospilan 20 SG 0.03% and in the ecological variantthe best results were obtainedwith the products Deffort 0.3%, Copfort 0.3%, Mimox 0.2%, Laser 240 SC 0.06%

Ciclul biologic al viermelui merelor -cydia pomonellal., la soiuri de nuc în condiţiile ecositemului pomicol Iaşi

The purpose of this paper is to follow Cydiapomonella's biological cycle with the help of pheromone traps in order to warn the treatments and to know the evolution of the pest in the NE area of Romania in the case walnut tree growing. Another objective pursued is to effectively combat this pest with plant protection substances. The observations were made in 2017, having as research material 14 walnut genotypes, in the 7thyear since planting, being grafted on Juglansregia as rootstock. In case of variant 1 phytosanitary treatments with fungicides and insecticides were carried out and in the second variant (V2) no phytosanitary treatments were carried out, pest control being carried out by biotechnical means, using AtraPom synthetic sex pheromones traps. During this period the climatic factors, which influence the occurrence of the pest, were analyzed. Based on the observations made, the flight curve of the species was drawn in the studied area. Following the monitoring of the C. pomonella, we can warn the treatments according to the number of adults captured, as follows: for the first generation in the period 16-20.05.2017 and for the second generation in the period between June 25thto July 1st

Observation of confined current ribbon in JET plasmas

we report the identification of a localised current structure inside the JET plasma. It is a field aligned closed helical ribbon, carrying current in the same direction as the background current profile (co-current), rotating toroidally with the ion velocity (co-rotating). It appears to be located at a flat spot in the plasma pressure profile, at the top of the pedestal. The structure appears spontaneously in low density, high rotation plasmas, and can last up to 1.4 s, a time comparable to a local resistive time. It considerably delays the appearance of the first ELM.Comment: 10 pages, 6 figure

Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points

This work addresses the question of the relation between strike-point splitting and magnetic stochasticity at the edge of a poloidally diverted tokamak in the presence of externally imposed magnetic perturbations. More specifically, ad-hoc helical current sheets are introduced in order to mimic a hypothetical screening of the external resonant magnetic perturbations by the plasma. These current sheets, which suppress magnetic islands, are found to reduce the amount of splitting expected at the target, which suggests that screening effects should be observable experimentally. Multiple screening current sheets reinforce each other, i.e. less current relative to the case of only one current sheet is required to screen the perturbation.Comment: Accepted in the Proceedings of the 19th International Conference on Plasma Surface Interactions, to be published in Journal of Nuclear Materials. Version 2: minor formatting and text improvements, more results mentioned in the conclusion and abstrac

On the mechanisms governing gas penetration into a tokamak plasma during a massive gas injection

A new 1D radial fluid code, IMAGINE, is used to simulate the penetration of gas into a tokamak plasma during a massive gas injection (MGI). The main result is that the gas is in general strongly braked as it reaches the plasma, due to mechanisms related to charge exchange and (to a smaller extent) recombination. As a result, only a fraction of the gas penetrates into the plasma. Also, a shock wave is created in the gas which propagates away from the plasma, braking and compressing the incoming gas. Simulation results are quantitatively consistent, at least in terms of orders of magnitude, with experimental data for a D 2 MGI into a JET Ohmic plasma. Simulations of MGI into the background plasma surrounding a runaway electron beam show that if the background electron density is too high, the gas may not penetrate, suggesting a possible explanation for the recent results of Reux et al in JET (2015 Nucl. Fusion 55 093013)