The X-rotor offshore wind turbine concept

The following paper provides an overview of a novel wind turbine concept known as the X-Rotor Offshore Wind Turbine. The X-Rotor is a new wind turbine concept that aims to reduce the cost of energy from offshore wind. Cost reductions are achieved through reduced capital costs and reduced maintenance costs. The following paper includes results from an early feasibility study completed on the concept. In the feasibility study exemplary designs were created and structural analyses were carried out. Turbine capital costs and maintenance cost of the X-Rotor concept were then roughly estimated. X-Rotor turbine costs and O&M costs were compared to four existing wind turbine types to investigate potential cost savings from the X-Rotor concept. Results show that the X-Rotor has potential to reduce O&M costs by up to 55% and capital costs by up to 32%. The combination of the capital cost and O&M cost savings show potential to reduce the CoE by up to 26%

Le Gombo (Abelmoschus esculentus L. Moench) (recherche d'une éventuelle action thérapeutique des mucilages du fruit et de la tige)

TOULOUSE3-BU Santé-Centrale (315552105) / SudocSudocFranceF

Whitefly population dynamics in okra plantations Dinâmica populacional de mosca-branca em quiabo

The control of whitefly Bemisia tabaci (Gennadius) biotype B (Hemiptera: Aleyrodidae) on okra (Abelmoschus esculentus L.) consists primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to evaluate the spatial and temporal population dynamics of the whitefly B. tabaci biotype B on two successive A. esculentus var. "Santa Cruz" plantations. Leaf chemical composition, leaf nitrogen and potassium contents, trichome density, canopy height, plant age, predators, parasitoids, total rainfall and median temperature were evaluated and their relationships with whitefly on okra were determined. Monthly number estimates of whitefly adults, nymphs (visual inspection) and eggs (magnifying lens) occurred on bottom, middle and apical parts of 30 plants/plantation (one leaf/plant). Plants senescence and natural enemies, mainly Encarsia sp., Chrysoperla spp. and Coccinellidae, were some of the factors that most contributed to whitefly reduction. The second okra plantation, 50 m apart from the first, was strongly attacked by whitefly, probably because of the insect migration from the first to the second plantation. No significant effects of the plant canopy on whitefly eggs and adults distribution were found. A higher number of whitefly nymphs was found on the medium part than on the bottom part.<br>O controle da mosca-branca Bemisia tabaci (Gennadius) biótipo B (Hemiptera: Aleyrodidae) em quiabeiro (Abelmoschus esculentus L.) consiste principalmente no uso de inseticidas, em virtude da falta de informação sobre outros fatores de mortalidade. O objetivo deste trabalho foi compreender a dinâmica populacional, espacial e temporal da mosca-branca em dois cultivos sucessivos de quiabeiro "Santa Cruz". Avaliaram-se a composição química foliar, os níveis foliares de nitrogênio e de potássio, a densidade de tricomas, a altura de dossel, a idade de planta, predadores, parasitóides, pluviosidade total, temperatura média e suas relações com a mosca-branca em quiabeiro. Estimou-se, mensalmente, o número de adultos e de ninfas (inspeção visual) e de ovos (lentes de aumento) de mosca-branca ocorridos nas folhas (uma folha/planta) localizadas nas partes basal, mediana e apical de 30 plantas/plantação. Os fatores que mais contribuíram com a redução da população mosca-branca foram a senescência de plantas e inimigos naturais, principalmente Encarsia sp., Chrysoperla spp. e Coccinellidae. O segundo cultivo de quiabo, a 50 m do primeiro, foi altamente atacado pela mosca-branca, provavelmente pela migração dos insetos do primeiro para o segundo cultivo. Não foi detectado efeito significativo do dossel de plantas sobre ovos e adultos. Foi encontrado maior número de ninfas na parte mediana do que na parte basal das plantas