排序方式： 共有14条查询结果，搜索用时 15 毫秒
11.
Maiara Priscilla de Souza Michele Hoeltz Lisianne Brittes Benitez Ênio Leandro Machado Rosana de Cassia de Souza Schneider 《洁净——土壤、空气、水》2019,47(11)
The search for clean technologies needs to be continued to offer alternatives for achieving sustainable energy production and a sustainable economy. This concern is particularly related to the demands of both producing enough renewable energy to meet future needs and reducing greenhouse gas (GHG) emissions. Microalgae are recognized for several benefits they offer, and in recent years, the use of life cycle assessment (LCA) to evaluate the benefits resulting from microalgae cultivation, harvesting/dewatering, biomass drying, extraction, and byproduct development has stimulated research in this area. Considering the importance of microalgae and clean technologies and the increasing number of publications on these subjects, this review aims to perform bibliometric mapping of such studies from 2008 to 2018. Web of Science and Scopus databases are used to identify leading trends. Visualization of similarities viewer (VOSviewer) software is applied to analyze the interactions among keywords. The results of this study indicate an association of microalgae and clean technologies and demonstrate that LCA is one of the most common tools used for such analyses. Bibliometric mapping provides relevant data to reinforce this association and understand the main bottlenecks that must be overcome in this field for future progress to be made. 相似文献
12.
There was significant eruptive activity on Lanzarote (Canary Islands) in the 18th and 19th centuries, and future activity is a clear likelihood today. The fact that not all of the island is covered by geodetic monitoring prompted the authors to assess the possibility of using SAR interferometry for routine volcanic activity monitoring of the island. This paper presents the results obtained after testing this technique using six radar images acquired by the ERS-1 and ERS-2 satellites during the period 1992-2000. The analysis of these images has confirmed the existence of long-term stability coherence across most of the island: a prerequisite for using SAR interferometry in volcano monitoring. The analysis of 15 (redundant) interferograms allowed us to study both the impact of atmospheric artifacts on Lanzarote and any possible displacements, and to conclude that there has been no displacement greater than 3 cm on the island during the period in question. This result matches those obtained with the geodetic equipment installed on the island. Our results show that the inclusion of SAR interferometry in routine geodetic monitoring, supplementing terrestrial techniques, will clearly improve the chances of detecting any possible deformation, and its broad coverage will enhance the interpretation of any observed anomalies. 相似文献
13.
Rosana?Menéndez-DuarteEmail author Jorge?Marquínez Graziella?Devoli 《Environmental Geology》2003,44(3):290-300
The heavy rains associated with Hurricane Mitch triggered off a number of slope instability processes in several Central American countries. Different instability processes have been acknowledged for the various mountainous regions of Nicaragua. An enormous movement of the Casita Volcano slopes resulted in numerous deaths and some deep movements have been reactivated. On the other hand, numerous shallow mass movements and debris flows have given rise to great material loss throughout a large part of Nicaraguan mountains.Mapping the shallow mass movements in an area of Central Nicaragua clearly reveals the close ties between their distribution and some geomorphological factors. A susceptibility model has been constructed for shallow mass movements based on field mapping of the shallow mass movement distribution, the geomorphological map as well as the digital slope and accumulated flow models. A logistical regression analysis was applied. The study area has been categorized into three classes of relative landslide susceptibility. Given that phenomena of this nature occur much more frequently in the high susceptibility class, 94% of the shallow mass movements that have been used to test the model are in the high and medium susceptibility classes . The geological and geomorphological conditions of the study area are representative of a large sector of the central Nicaraguan region. Consequently, the methodology followed in this paper is deemed to constitute a useful tool, both regarding the design of new infrastructures, and as a guide to the urban development of the area. 相似文献
14.
Rosana Peporine Lopes Mabel N. Costas Ulbrich Horstpeter Ulbrich 《Central European Journal of Geosciences》2014,6(4):422-456
Fernando de Noronha archipelago presents an older Remédios Formation with subvolcanic intrusions, belonging to two different alkaline series, the sodic (undersaturated: basanites, tephrites, essexites, tephriphonolites, phonolites), and potassic ones (mildly undersaturated to silicic, with alkali basalts, basaltic trachyandesites, trachyandesites, trachytes), and lamprophyres. The upper Quixaba Formation presents nephelinite flows and basanites. A third minor unit, São José, is constituted by basanites carrying mantle xenoliths. Magnesian olivines occur in the Remédios basanites and alkali basalts, and in nephelinites. Melilites are present as groundmass grains in melilite melanephelinites (MEM). Clinopyroxenes (cpx) are mostly salites to titaniferous salites (Remédios sodic series), grading into aegirines in the differentiated aphyric phonolites. Cpx in the lamprophyres show disequilibrium textures. In the Quixaba flows, cpx are salites, enriched in Mg (especially in MEM). Amphiboles, remarkably, are common in tephriphonolites and phonolites and in basaltic trachyandesites, sometimes with disequilibrum zoning textures, and a conspicuous phase in lamprophyres. Dark micas are present as groundmass plates in MEM, OLM and PYM (olivine and pyroxene melanephelinites), with compositional variety (enriched in Ti, Ba, Sr) depending on the composition of the parent rock; BaO can be as high as 16–19%. Feldspars crystallize as calcic plagioclases, sanidines and anorthoclases, depending on the rock types, as phenocrysts and in groundmass, both in Quixaba and Remédios rocks; they are absent in nephelinites. Nephelines are found in Remédios sodic series types and Quixaba rocks. Haüyne and noseane are rarely observed in Remédios rocks. 相似文献