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111.
本文采用计算流体力学中的高分辨率PPM格式,数值模拟了多方气体球的引力坍缩、激波形成和传播。物态方程取成p=K(s)ρ^γ,γ为密度的分段函数,通过绝热指数γ的不同取法对三个模型分别进行了计算,并对引力坍缩、反弹激波形成和传播等三个过程及不型之间计算结果的一些差异做了比较仔细的分析,得到了一些初步结论。 相似文献
112.
Several coastal rocky shores in the northern Chile have been affected by the discharges of copper mine tailings. In spite of this, the temporal and spatial variation on the diversity and composition of their intertidal benthic communities has scarcely been studied. The objectives of the present study were to analyse and to compare quantitatively the temporal variation on the diversity, cover and composition of sessile species in rocky intertidal benthic communities of the northern Chilean coast, in relation to the presence of copper mine tailings. The results show that the drastic reduction on the sessile species diversity and the monopolization of the substrate exerted by the green algae Enteromorpha compressa, are common and permanent features of the intertidal rocky shores affected by copper mine tailings. Such spatial (between sites) and temporal (seasonal) variation of these changes has been associated with the relative concentrations of trace metals and inorganic particles of the mining wastes. Our results suggest that the mechanical effects of resuspended and settling tailings are a more likely cause. 相似文献
113.
Martínez-Gómez C Campillo JA Benedicto J Fernández B Valdés J García I Sánchez F 《Marine pollution bulletin》2006,53(5-7):305-314
Hepatic biomarker responses were measured in two demersal fish species (Lepidorhombus boscii and Callionymus lyra) from the northern Iberian shelf associated with the massive Prestige oil spill (POS), five months after the accident. The biomarkers selected were 7-ethoxyresorufin-O-deethylase (EROD), glutathione-S-transferase (GST), glutathione reductase (GR), catalase (CAT), and DNA integrity. Interspecies differences and spatial variations in biomarker responses were observed along the shelf. GST, GR and CAT activities were significantly elevated in L. boscii in the most oil impacted area (Finisterre) and positively correlated (p<0.05) with POS tar aggregate densities. The lack of previous data from the area together with the existence of chronic background pollution of the shelf implies that the observed biomarker responses cannot be solely attributed to the petroleum hydrocarbon components of the spilled oil. This first biological effect assessment showed that L. boscii is a potentially suitable target species to be used in future biomonitoring programmes along the northern Iberian shelf. 相似文献
114.
Xiaogang Chen Qi Ye Jinzhou Du Neven Cukrov Nu?a Cukrov Yan Zhang Ling Li Jing Zhang 《海洋学报(英文版)》2023,(8):158-170
Subterranean estuaries(STEs) are characterized by the mixing of terrestrial fresh groundwater and seawater in coastal aquifers. Although microorganisms are important components of coastal groundwater ecosystems and play critical roles in biogeochemical transformations in STEs, limited information is available about how their community dynamics interact with hydrological, geochemical and environmental characteristics in STEs. Here,we studied bacterial and archaeal diversities and distributions wi... 相似文献