4 research outputs found
VEICOLO RIUTILIZZABILE A BASSA SPINTA PER MISSIONI LUNARI BASATO SULLA STAZIONE SPAZIALE INTERNAZIONALE
Il lavoro svolto definisce un veicolo a bassa spinta destinato a trasportare un carico scientifico in orbita lunare. Il veicolo è capace di rientrare in orbita bassa e attraccare alla Stazione Spaziale Internazionale, dove viene ripristinato. In questo studio si definisce una strategia di missione e si dimensiona il veicolo
The influence of climate and dam construction on the Ibera wetlands, Argentina
The purpose of this work is to assess the impact
on the Esteros del Ibera wetland ecosystem caused by
the Yacyreta dam, a large hydroelectric power plant on
the Parana River, Argentina, in comparison to other
factors of environmental change. The project of the dam
started around 1970. The power plant began operating
in 1994. In 1989, the neighboring Ibera wetland ecosystem
showed a substantial increase in the water level
for which several different causes were conceivable,
including climate change and the dam construction. We
analyzed all existing hydrometeorological data and
studied other changes that were observed in this ecosystem.
A water balance model was used to analyze
different scenarios. Increased groundwater inflow, generated
since the construction of the dam, appears to be
affecting the wetland more than any other factor. The
study has implications for the assessment of global and
regional consequences of building dams
The Type of Grain Counts: Effectiveness of Three Essential Oil-Based Nanoemulsions against <i>Sitophilus oryzae</i>
Essential oil (EO)-based nanoemulsions (NEs) are promising grain protectants in the management of stored-product pests. However, the potential impact of the stored-grain species on the green insecticide effectiveness has been poorly studied. In this study, two concentrations of EO-based NEs from Carlina acaulis L., Mentha longifolia (L.) Huds., and Hazomalania voyronii (Jum.) Capuron were evaluated as insecticides against the major stored-product pest Sitophilus oryzae (L.) on barley, oats, and maize kernels. The C. acaulis EO-based NE applied at 1000 ppm on barley achieved the highest mortality, killing 94.4% of S. oryzae adults after a 7-day exposure, followed by 1000 ppm of H. voyronii EO-based NE (83.3%). The lowest mortality (1.1%) was recorded with 500 ppm of M. longifolia EO-based NE on maize after the same interval. All tested NEs exhibited elevated efficacy when applied on barley, while mortalities were lower on oats and maize. Furthermore, C. acaulis EO-based NE was the most effective when applied on all commodities, followed by H. voyronii and M. longifolia EO-based NEs. Overall, our results highlighted the significant impact of the stored cereal on the insecticidal effectiveness of EO-based NE used for stored-product pest control. Sitophilus oryzae adults on barley can be adequately controlled through the application of C. acaulis and H. voyronii EO-based NEs