老年人备灾现状及应对策略的研究进展

阐述国内外老年人的备灾现状,老年人应对灾害能力下降,备灾能力较低,应对灾害相关知识和教育缺乏,慢性疾病影响其备灾状态,其获取备灾信息途径和方式单一。提出需建立社区备灾组织、提供..

固定化细胞技术在矿业领域中的应用

介绍了固定化细胞技术的特点,细胞固定方法,固定化载体及固定化反应器类型,并简要评述了细胞固定化技术在国内矿业领域中的应用情况

Annual variation and spatial distribution of nutrients in the Laizhou Bay

To better understand the distribution and annual variation of nutrients in the Laizhou Bay, a successive survey about dissolved inorganic nitrogen (DIN), phosphate(PO_4-P) and silicate(SiO_3-Si) from 2004 to 2014 was conducted. In the present study, high concentrations of DIN, PO_4-P and SiO_3-Si were located at the southwest coast of the Laizhou Bay, especially at Xiaoqing River estuary and its vicinity. The spatial distributions of nutrients in the Laizhou Bay were mainly influenced by the terrestrial inputs such as Xiaoqing River and itsvicinity. Although, DIN concentrations in the Laizhou Bay from 2004 to 2014 were higher with medians ranging from 8.14 μmol/L to 53.98 μmol/Lthan those in the 80 s and 90 s of the 20th century, anannual variation trend of slight decreased from 2004 to 2014 was shown in the Laizhou Bay. The nitrate was the main form of DIN contributing 83 %, while nitrite and ammonium salt contributing 7 % and 10 %, respectively. Low concentrations of PO_4-P in the Laizhou Bay were observed with medians ranging from 0.03 μmol/L to 0.49 μmol/L with an obvious annual variation trend of decrease. The medians of SiO_3-Si in the Laizhou Bay ranged from 8.5 μmol/L to 52.9 μmol/L with a decrease annual variation trend in August. The temporal distributions of nutrients in the Laizhou Bay were mainly influenced by the nutrients fluxes of Xiaoqinghe River. The medians variation of DIN/PO_4、SiO_3 /DIN and SiO_3 /PO_4 were 78.9~1112.4, 0.2~2.2 and 40.2~442.5, respectively. The annual variation trends of increase for DIN/PO_4 and SiO_3 /PO_4 while no obvious annual variation trend for SiO_3 /DIN were observed from 2004 to 2014. The analysis on nutrient structure indicated that PO_4-P was absolute limitation with the trend of increase while SiO_3-Si was the limitation in May. The nutrient levels of the Laizhou Bay shifted from oligotrophy in the 80 s and 90 s of the 20th century to potential eutrophication of phosphorus limitation during 2004-2014

Fe2（SO4）3溶液细菌辅助浸出高砷金精矿

利用摇瓶实验对纯Fe2（SO4）3溶液浸出高砷金精矿进行了研究,考察了温度及Fe3＋浓度的影响,并与细菌直接浸矿进行了对比.同时,在Fe2（SO4）3溶液中加入高密度嗜中温氧化亚铁硫杆菌、嗜中温氧化硫硫杆菌、中度嗜热西伯利亚硫杆菌,考察其对Fe2（SO4）3溶液的辅助浸出作用.结果表明,Fe3＋溶液化学浸出可迅速溶解高砷金精矿,随温度升高,浸出率先升后降,80℃时达最大;浸出前期Fe3＋浓度的积累对浸出速率影响不大,初始Fe3＋浓度越高As的浸出率越高,但当Fe3＋浓度高于40g/L,由于沉淀严重,浸出率降低;连续浸出情况下,Fe3＋浓度可维持恒定,10g/L的Fe3＋可保持较快的矿物浸出速率.对照实验表明,较高的矿浆浓度对浸矿菌生长繁殖有显著影响.高密度浸矿菌可维持Fe2（SO4）3溶液中较高的Fe3＋浓度并及时消除反应产生的S层的阻碍,有利于Fe2（SO4）3溶液对矿物的浸出

Fe_2(SO_4)_3溶液细菌辅助浸出高砷金精矿

利用摇瓶实验对纯Fe2(SO4)3溶液浸出高砷金精矿进行了研究,考察了温度及Fe3+浓度的影响,并与细菌直接浸矿进行了对比.同时,在Fe2(SO4)3溶液中加入高密度嗜中温氧化亚铁硫杆菌、嗜中温氧化硫硫杆菌、中度嗜热西伯利亚硫杆菌,考察其对Fe2(SO4)3溶液的辅助浸出作用.结果表明,Fe3+溶液化学浸出可迅速溶解高砷金精矿,随温度升高,浸出率先升后降,80℃时达最大;浸出前期Fe3+浓度的积累对浸出速率影响不大,初始Fe3+浓度越高As的浸出率越高,但当Fe3+浓度高于40g/L,由于沉淀严重,浸出率降低;连续浸出情况下,Fe3+浓度可维持恒定,10g/L的Fe3+可保持较快的矿物浸出速率.对照实验表明,较高的矿浆浓度对浸矿菌生长繁殖有显著影响.高密度浸矿菌可维持Fe2(SO4)3溶液中较高的Fe3+浓度并及时消除反应产生的S层的阻碍,有利于Fe2(SO4)3溶液对矿物的浸出

Fe2（SO4）3溶液细菌辅助浸出高砷金精矿

利用摇瓶实验对纯Fe2（SO4）3溶液浸出高砷金精矿进行了研究,考察了温度及Fe3＋浓度的影响,并与细菌直接浸矿进行了对比.同时,在Fe2（SO4）3溶液中加入高密度嗜中温氧化亚铁硫杆菌、嗜中温氧化硫硫杆菌、中度嗜热西伯利亚硫杆菌,考察其对Fe2（SO4）3溶液的辅助浸出作用.结果表明,Fe3＋溶液化学浸出可迅速溶解高砷金精矿,随温度升高,浸出率先升后降,80℃时达最大;浸出前期Fe3＋浓度的积累对浸出速率影响不大,初始Fe3＋浓度越高As的浸出率越高,但当Fe3＋浓度高于40g/L,由于沉淀严重,浸出率降低;连续浸出情况下,Fe3＋浓度可维持恒定,10g/L的Fe3＋可保持较快的矿物浸出速率.对照实验表明,较高的矿浆浓度对浸矿菌生长繁殖有显著影响.高密度浸矿菌可维持Fe2（SO4）3溶液中较高的Fe3＋浓度并及时消除反应产生的S层的阻碍,有利于Fe2（SO4）3溶液对矿物的浸出

Fe2(SO4)3溶液细菌辅助浸出高砷金精矿

利用摇瓶实验对纯Fe2（SO4）3溶液浸出高砷金精矿进行了研究,考察了温度及Fe3＋浓度的影响,并与细菌直接浸矿进行了对比.同时,在Fe2（SO4）3溶液中加入高密度嗜中温氧化亚铁硫杆菌、嗜中温氧化硫硫杆菌、中度嗜热西伯利亚硫杆菌,考察其对Fe2（SO4）3溶液的辅助浸出作用.结果表明,Fe3＋溶液化学浸出可迅速溶解高砷金精矿,随温度升高,浸出率先升后降,80℃时达最大;浸出前期Fe3＋浓度的积累对浸出速率影响不大,初始Fe3＋浓度越高As的浸出率越高,但当Fe3＋浓度高于40g/L,由于沉淀严重,浸出率降低;连续浸出情况下,Fe3＋浓度可维持恒定,10g/L的Fe3＋可保持较快的矿物浸出速率.对照实验表明,较高的矿浆浓度对浸矿菌生长繁殖有显著影响.高密度浸矿菌可维持Fe2（SO4）3溶液中较高的Fe3＋浓度并及时消除反应产生的S层的阻碍,有利于Fe2（SO4）3溶液对矿物的浸出

Fe2(SO4)3溶液细菌辅助浸出高砷金精矿

利用摇瓶实验对纯Fe2（SO4）3溶液浸出高砷金精矿进行了研究,考察了温度及Fe3＋浓度的影响,并与细菌直接浸矿进行了对比.同时,在Fe2（SO4）3溶液中加入高密度嗜中温氧化亚铁硫杆菌、嗜中温氧化硫硫杆菌、中度嗜热西伯利亚硫杆菌,考察其对Fe2（SO4）3溶液的辅助浸出作用.结果表明,Fe3＋溶液化学浸出可迅速溶解高砷金精矿,随温度升高,浸出率先升后降,80℃时达最大;浸出前期Fe3＋浓度的积累对浸出速率影响不大,初始Fe3＋浓度越高As的浸出率越高,但当Fe3＋浓度高于40g/L,由于沉淀严重,浸出率降低;连续浸出情况下,Fe3＋浓度可维持恒定,10g/L的Fe3＋可保持较快的矿物浸出速率.对照实验表明,较高的矿浆浓度对浸矿菌生长繁殖有显著影响.高密度浸矿菌可维持Fe2（SO4）3溶液中较高的Fe3＋浓度并及时消除反应产生的S层的阻碍,有利于Fe2（SO4）3溶液对矿物的浸出