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831.
832.
针对轻质油品罐区的两个扫线污油旧罐在使用中存在的隐患,对照油罐的现行相关设计规范进行了危险性分析,提出了扫线污油罐的安全措施。 相似文献
833.
绿色高强混凝土——硅灰混凝土 总被引：4，自引：0，他引：4
硅灰是冶金厂生产硅铁和工业硅过程中产生的废灰,硅灰混凝土为绿色混凝土,它不仅节约了水泥熟料,而且改善了环境,大大促进了混凝土和建筑工程的健康发展,混凝土中掺入硅灰可得到高强和超高强混凝土,用此混凝土浇制的结构物其安全度大大提高,经济效益显著,硅灰混凝土还可以有效抑制碱骨料反应,提高结构物的安全度和耐久性,延长使用寿命。 相似文献
834.
我国公众灾害教育研究综述 总被引：2，自引：1，他引：2
面向公众的灾害教育是防灾减灾工作中的重要一环。通过对公众灾害教育相关研究梳理,明确其概况、实施途径,在此基础上提出策略促进其开展,进而提高全民防灾素养。 相似文献
835.
Kefang Zhang Zhongliang Liu Zhaoliang Wang Yanxia Li 《Greenhouse Gases: Science and Technology》2016,6(2):275-287
In coal‐fired power plants, steam is extracted from steam turbine to supply the regeneration heat for chemical absorption carbon capture. This research analyses the steam and heat consumption of a CO2 capture system for different extracted steam, as well as the influences of different extracted steam on electricity production and power plant electric efficiency. Results show that specific steam consumption and specific heat consumption, which only reveal the quantity of the steam consumption, could not be used for evaluating the true energy savings of different steam extraction methods. Specific exergy consumption of the extracted steam (SEXCS), which focuses on both the quantity and quality of energy, is proposed and used as a main comprehensive evaluation index in the CO2 capture system. Compared with specific steam consumption and specific heat consumption, SEXCS can better evaluate the true energy saving of the different extracted steam. Compared with plant electric efficiency and specific primary energy consumption for carbon avoided (SPECCA), SEXCS is both simple in calculation and easy in acquiring the required data. SEXCS is thus recommended to be used as an important index for selection of steam extraction schemes for CO2 capture systems. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd 相似文献
836.
This work was designed to explore the characteristics of photodegradation of herbicides in the copper-polluted water body. Theresults showed that Cu(II) alone could induce a photo Fenton-like reaction to enhance the degradation of atrazine, in which hydroxylradical ( OH) was a main active species. Humic acids restrained atrazine degradation, nevertheless, when introducing Cu(II), thephotodegradation was accelerated, in which singlet oxygen (1O2) replaced OH acting as the prevailing species. A feasible mechanismfor the photochemical process was also proposed, which is helpful for better understanding the environmental photochemistry ofatrazine in the copper-polluted water. 相似文献
837.
The association between the rhizospheric microbial community and Cd accumulation in rice is poorly understood. A field trial was conducted to investigate the different rhizobacterial communities of two rice cultivars with high Cd accumulation (HA) and low Cd accumulation (LA) at four growth stages. Results showed that the Cd content in the roots of the HA cultivar was 1.23 - 27.53 higher than that of the LA cultivar (0.08 - 10.5 µg/plant) at four stages. The LA cultivar had a significantly lower Cd availability in rhizosphere and a higher quantity of iron plaque (IP) on the root surface than the HA cultivar at four stages. This resulted in the reduction of Cd concentration in IPs and Cd translocation from IP-to-root. Microbial analysis indicated that the LA cultivar formed a distinct rhizobacterial community from the HA cultivar and had less α-diversity. The rhizosphere of the LA cultivar was enriched in specific bacterial taxa (e.g., Massilia and Bacillus) involved in Cd immobilization by phosphate precipitation and IP formation by iron oxidization. However, the rhizosphere in the HA cultivar assembled abundant sulfur-oxidizing bacteria (e.g., Sulfuricurvum) and iron reduction bacteria (Geobacter). They promoted Cd mobilization and reduced IP formation via the metal redox process. This study reveals a potential approach in which specific rhizobacteria decrease or increase Cd accumulation in rice on contaminated soil and provides a new perspective for secure rice production. 相似文献
838.
839.
Ji Hu Jianmin Wang Shuxia Liu Zhechao Zhang Haifeng Zhang Xiaoxia Cai Jianming Pan Jingjing Liu 《环境科学学报(英文版)》2018,30(4):208-215
TiO_2 nanoparticles(NPs) could adversely impact aquatic ecosystems. However, the aggregation of these NPs could attenuate this effect. In this work, the biological effects of TiO_2 NPs on a marine microalgae Isochrysis galbana were investigated. The aggregation kinetics of TiO_2 NPs under different conditions was also investigated to determine and understand these effects. Results showed that, though TiO_2 NPs had no obvious impact on the size and reproducibility of algal cells under testing conditions, they caused a negative effect on algal chlorophyll, which led to a reduction in photosynthesis. Furthermore, fast aggregation of TiO_2 NPs occurred under all conditions, especially at the pH close to the p Hzpc. Increasing ionic strength and NP concentration also enhanced the aggregation rate.The aggregation and the following sedimentation of TiO_2 NPs reduced their adverse effects on I. galbana. 相似文献
840.