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71.
72.
“国六条”的核心是调整结构稳定房价。对于解决价格增长过快的方式,应该从规划入手,提供各区域配套功能合理到位的房屋供给,这样也能达到平抑房价的目的。乔新生指出,一个城市房地产发展的快慢,固然能够在一定程度上反映城市经济发展的好坏。 相似文献
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ABSTRACT Abstracts (3 copies) are due ON OR BEFORE NOVEMBER 1, 1984, to the General Chairman, The abstract should not exceed 200 words and must include the paper's title, all author(s) name(s) and affiliation(s). The full mailing address and telephone number of the senior author must be included. All attendees, including authors, will be expected to pay registration fees at the Symposium. 相似文献
75.
土壤环境机械组成特征及其分布规律 总被引:4,自引:0,他引:4
通过对甘肃省土壤环境机械组成的调查研究,较全面、系统地获得了各种土质各区域的土壤环境机械组成,找出了甘肃省土壤环境机械组成特征及其分布规律。 相似文献
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van Hove LW Bossen ME San Gabino BG Sgreva C 《Environmental pollution (Barking, Essex : 1987)》2001,114(3):371-382
Shoots of a sensitive (Populus nigra 'Brandaris') and a more tolerant (Populus euramericana 'Robusta') poplar clones were exposed for 30 days to Filtered Air or ambient O3-concentrations in fumigation cabinets. At regular intervals were determined: gas exchange of the leaves, the internal air space (Vair) and apoplastic water volume (Vapo) and the reduced (ASA) and oxidized (DHA) ascorbate concentration in the apoplast and in the mesophyll cells. The apoplastic ASA-concentration was 0.2 mM at the start of the experiment for both cultivars, while the effective cell wall thickness, estimated from Vapo, varied from 0.3 to 0.6 micron. Model calculations revealed that only 30% of the O3 molecules entering the apoplast was intercepted at these values. The O3-treatment induced a decline in stomatal conductance, an increase in Vapo and in the apoplastic ASA-concentration. As a result the estimated O3-flux to the cell membrane strongly declined. However, these responses occurred after the O3-induced reduction in photosynthesis. Moreover, they did not prevent early senescence of the leaves at a prolonged exposure. Therefore, it is concluded that the increase in apoplastic ASA-concentration was rather a general stress reaction of the affected poplar leaf than a (specific) defence reaction induced by O3. Our results suggest that other factors than the scavenging efficiency of apoplastic ASA were responsible for the difference in O3 sensitivity between both poplar cultivars. 相似文献
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Input–output modelling is a useful tool in policy analysis and economic planning. This methodology is used to detect the inter-industry linkages known as forward and backward linkages. Examination of these measures provides one mechanism for identifying “key” or “leading” sectors. The main objective of this paper is to measure the linkages of the mining and quarrying industry in the European Union (EU) and to determine if any of the industry subsectors can be considered key sectors. The paper shows that three subsectors can be considered key sectors: the mining of coal and lignite and extraction of peat in Germany; mining of metal ores in Sweden; and other mining and quarrying in Austria, Denmark and Spain. These sectors are more stimulated by overall industry growth than other sectors and have greater impacts in terms of investment expenditures on the national economy than other sectors. The values of the forward and backward linkages show that the mining and quarrying is an industry that would be stimulated by an increase in a regional economy's production more than other sectors, while an increase in the mining and quarrying industry's output would not stimulate this regional economy more than an increase in other sectors. 相似文献
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矿山酸性废水重金属沉淀分离研究 总被引:3,自引:0,他引:3
矿山酸性废水对环境的污染包括酸性废水和重金属离子两个方面,矿山酸性废水的治理也包括酸性废水和重金属离子处理两方面的内容。重金属沉淀分离是利用重金属离子的氢氧化物和硫化物沉淀溶度积不同,在控制不同的沉淀条件下,进行特定离子的沉淀分离,从而使得废水中的重金属离子得到处理,分步沉淀使得回收沉淀物保持较高的有价金属品位,更易于资源化。分步沉淀反应后,进行相应的固/液分离,并回流部分沉淀物至沉淀反应池,固/液分离后出水,经pH调节,可以达标排放或回用。 相似文献
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Lim Hwee San Rajab Jasim Al-Salihi Ali Salih Zainab MatJafri Mohd. Zubir 《Environmental science and pollution research international》2022,29(7):9755-9765
Environmental Science and Pollution Research - Air surface temperature (AST) is a crucial importance element for many applications such as hydrology, agriculture, and climate change studies. The... 相似文献