1,720,975 research outputs found
Analisi probabilistica della propagazione armonica nei sistemi di alimentazione ferroviaria
No full textCarbon uptake and air pollution mitigation of different Evergreen shrub species
No full textThree independent experiments assessed CO2 assimilation and metals leaf deposition of seven evergreen shrub species (Arbutus unedo L., Elaeagnus × ebbingei L., Laurus nobilis L., Ligustrum japonicum Thunb., Photinia × fraseri Dress., Viburnum tinus subsp. lucidum L., and Viburnum tinus subsp. tinus L.). CO2 assimilation and carbon allocation were determined in 2011 (Exp. 1) under optimal water availability and in 2012 (Exp. 2) under drought on potted plants. A third experiment (Exp. 3) measured seasonal leaf depositions of Cd, Cu, Ni, Pb, and Zn in 2011 on plants transplanted in proximity of a four-lane road. E. × ebbingei showed the highest CO2 assimilation under optimal water availability but one of the lowest under drought (Exp. 1, 2). Conversely, P. × fraseri had intermediate CO2 assimilation but it declined less during drought compared to the other species. In Experiment 3, E. × ebbingei showed the highest metal deposition, mainly due to its greater leaf area. Greater rainfall and RH% decreased metal depositions, whilst greater wind velocity and air temperature increased leaf depositions. Species which drastically reduce CO2 assimilation under drought (V. tinus subsp. lucidum, L. japonicum, E. × ebbingei) are not recommended in droughtprone environments, where drought-tolerant "mesic" species (P. × fraseri), should be preferred. E. × ebbingei could be used to optimize deposition of metals. The three experiments provide useful insights especially about CO2 assimilation (Exp. 1, 2) and air pollution mitigation (Exp. 3) of widely used shrubs for application in urban areas and planning of roadside greening in southern Europe
Effect of storage temperature and duration on vase life of cut Ruscus racemosus L. foliage
No full textCut foliages are important fillers in ornamental compositions. Usually, the vase life is already long enough to satisfy the consumers’ needs. However, some cooperatives and commercialization companies would extend as much as possible the storage for covering the periods of production lack. The aim of this work was to evaluate the potential storage ability of cut Ruscus racemosus foliages, selected following the commercial requirements. The cut foliages were stored at 4 or 10°C in vase containing distilled water. After 14, 21 and 28 days of storage, the cut foliages were transferred to 20°C in controlled environment for vase life evaluation. Immediately after storage, the chlorophyll a fluorescence and sugar (reducing sugars and sucrose) contents were measured. The vase life of cut Ruscus evaluated immediately after harvest was 34 days. After 14 days the vase life of cut foliage was reduced to 27-28 days without differences between 4 and 10°C. The effect of temperature became visible after 21 days of storage. The cut foliage stored at 10°C showed a vase life of 23 days while those stored at 4°C showed a slightly reduced vase life, compared with control. After 28 days of storage, the vase life of cut foliage was strongly reduced, 22 and 13 days respectively at 4 or 10°C, but still acceptable for ornamental use. During storage, the chlorophyll a fluorescence parameter that was able to show the senescence and reduction of quality was the dissipation of energy per cross section DIo/CS in cut foliage stored at 10°C. Sucrose significantly declined only in cut foliage stored at 10°C
Mild Vacuum Packaging for Long Storage of cut Danae racemosa (L.) Moench Foliage
No full textCut foliage is used as fillers to improve the appearance of bouquets or floral decorations. The growing season in Italy is comprised from September to May. Therefore, there is a period of product unavailability. The commercial cooperatives and floral industries are very interested to extend as much as possible the period of storage. The aim of this work was to evaluate the use of mild vacuum as potential storage system for cut Danae racemosa foliage. The cut foliages were stored at 4°C in distilled water as control and in plastic bags with reduced atmosphere using vacuum packing machines (vacuum ranged from 0.1 to 0.5 MPa). After 30, 45 and 60 days of storage, the cut foliages were transferred to 20°C in controlled environment for vase life evaluation. Immediately after storage, the chlorophyll a fluorescence and sugar (reducing sugars and sucrose) contents were measured. The vase life of cut foliage evaluated immediately after harvest was 35 days. After 30 days of storage the vase life was 30 days in the control and 28 days in mild vacuum stored foliage. After 45 days the vase life declined and was in average 21 days in both storage treatments. After 60 days of storage, the vase life in control was 15 days and in mild vacuum treatment was 10 days. The results of chlorophyll a fluorescence showed that the cut foliage were more stressed in mild vacuum than in control and that probably explains the reduction of vase life. The reducing sugars were not affected by the storage treatments, while sucrose content was higher in mild vacuum stored foliage especially when stored for 45 and 60 days
Developments of Power Quality studies in Electric Transportation System
No full textThe paper deals with the update studies on Power Quality for electric traction systems. Probabilistic methods of analysis are presented both for the supply lines and the rolling stocks. Simulation software tools are created for disturbance propagation studies and examples of application are reported with reference to the Italian railway case
Flower Longevity and Ethylene Production in Different Development Stages and Treatments in Lilium
No full textThe cut lily flowers may be considered on the edge between sensitive and insensitive to ethylene. The effect of ethylene inhibitors did not always increase the vase life of these cut flowers and the effect of treatments is variable with cultivars. The aim of this work was to investigate the ethylene production and the flower longevity of Asiatic lily (cv. Elite and Prato) during natural senescence (attached flowers) or on cut stems (with or without storage at 4°C). The flower longevity did not change very much (only 1 day) in the different treatments. Blasting or incomplete opening of apical buds was observed only in cut inflorescences. Ethylene production was very low and slightly increased during senescence. No climacteric peak and no significant differences between attached and detached flowers were observed. Pistils produced higher levels of ethylene during the first developmental stage, when the bud was still closed, and lower level during development. The lowest value of ethylene production was observed when the flowers were fully opened
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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