电站余热淡化海水研究     

鲁海军  温高 《绿色科技》2011,(12)

提出了一种直接利用燃煤电站余热淡化海水装置，从理论上研究了最高海水温度对系统性能的影响，分析了最高盐水温度对装置的造水比和冷却海水流量的影响以及该系统的经济性。结果表明：该系统能耗小，淡化成本低，同时利用了大量余热，证明该装置具有较大的应用前景。  相似文献   

Alkaloid Accumulation in Catharanthus roseus Increases with Addition of Seawater Salts to the Nutrient Solution   总被引：1，自引：0，他引：1  

WANG Jing-Yan  LIU Zhao-Pu College of Resources  Environmental Sciences  Nanjing Agricultural University  Nanjing 《土壤圈》2010,(6)

A sand culture experiment was conducted to determine the effects of different seawater (5% and 10%) treatments on plant growth,inorganic ions,indole alkaloid concentrations and yields of Catharanthus roseus,in an effort to increase the alkaloid yield by artificial cultivation.The total fresh and dry weights and tissue K + concentrations decreased,but Na + concentrations increased in the plant roots,stems and leaves of C.roseus under seawater stress as compared to the control.The concentrations and yields of...  相似文献   

半径间隙对水润滑轴承轴心轨迹的影响     

叶晓琰  杨旭林  胡敬宁  耿浩涵 《排灌机械工程学报》2019,37(9):788-792

为了研究海水淡化高压泵水润滑轴承半径间隙对转子系统稳定性的影响,设计了3种不同半径间隙的水润滑轴承,采用数值模拟和试验研究相结合的方法,对不同半径间隙时的干、湿转子轴心轨迹进行研究.结果表明:随着轴承半径间隙的增大,干转子的涡动中心明显向X,Y轴负方向漂移,而湿转子由于系统的阻尼增大涡动中心变化不明显;湿转子的涡动振幅明显大于干转子的;数值计算的结果与试验结果基本吻合,在轴承间隙较大时,干转子系统稳定性较差,半径间隙为0.1 mm时,润滑效果最好.研究结果为海水淡化高压泵水润滑轴承参数的优化设计提供必要的参考依据.  相似文献   

中国养殖水产品供给特征分析   总被引：1，自引：0，他引：1  

谢静华  高健 《上海水产大学学报》2006,15(2):222-227

通过对1985年至2004年的水产养殖产量分品种、分产区进行分类统计分析,发现我国养殖水产品供给呈现以下特点:(1)水产养殖产量快速增长;(2)海水养殖占水产养殖产量的比例逐渐上升;(3)养殖品种趋同性问题仍未根本改善;(4)特种水产品产量提高较快;(5)沿海地区、长江和珠江流域等传统养殖区仍是我国主要水产养殖区。文章最后对我国水产养殖存在的问题以及发展对策展开了讨论。  相似文献   

大型海藻对海水水族箱生态微宇宙结构及稳定性的影响     

钟逸云  郜晓峰  邢浩  刘炜  常佳楠  张建琳  何培民  孙彬 《上海海洋大学学报》2022,31(2):421-432

稳定高效的多营养层级景观生态系统构建是近年来水族行业的发展热门,为探究海水水族箱在引入大型海藻后微宇宙生态系统结构和稳定性的变化,分别对不同处理组进行水质指标、浮游生物及细菌群落结构分析。结果表明：（1）有藻组水体溶解氧（DO）含量和pH上升趋势高于无藻组,并可维持亚硝态氮（NO2--N）含量在较低水平,实验结束时磷酸盐（PO43--P）及铵态氮（NH4+-N）含量显著低于无藻组（P < 0.05）。（2）有藻组细菌多样性及均匀度指数显著低于无藻组（P < 0.05）;浮游生物群落均匀度指数存在显著组间差异（P < 0.05）。（3）细菌群落结构分析结果显示,无藻及有藻组第一、二优势菌门均为变形菌门（Proteobacteria）、放线菌门（Actinobacteria）,无生物对照组分别为变形菌门和厚壁菌门（Firmicutes）;各处理组浮游生物群落的第一优势门均为硅藻门（Bacillariophyta）,至少占样品中浮游生物群落丰度的40%以上,第一优势属均为直链藻属（Melosira）。（4）CCA结果显示,无藻组微生物优势种丰度与营养盐含量呈正相关关系,与溶解氧（DO）及pH负相关,有藻组则相反。通过以上结果可推测,不同营养层级的微宇宙系统浮游生物及细菌群落组成不同,培养针叶蕨藻（Caulerpa sertularioides）能有效改善生态水族箱水质环境并影响水体微宇宙结构,有利于构建稳定高效并美观的海水景观生态系统。  相似文献   

海水闭合循环系统生物滤器微生物特性研究   总被引：19，自引：0，他引：19  

刘艳红  罗国芝  朱学宝 《农业环境科学学报》2004,23(3):540-544

利用扫描电镜以察、荧光显微镜计数、氚化胸苷示踪等方法，研究了盐度为35的海水闭合系统生物滤器稳定成熟过程中，生物膜生物相的构建及系统中三态氮等水质指标的变化情况等。结果表明，海水闭合循环系统生物滤器可以建立完整的硝化作用，其稳定成熟过程与淡水及咸淡水生物滤器的情况相同，只是亚硝酸氧化滞后现象比较明显、细菌及其他牛物的变化与水化学指标的变化相吻合。试验系统达成熟状态需75d左右。  相似文献   

Towards sustainable exhibits – application of an inorganic fertilization method in coral reef fish larviculture in an aquarium          下载免费PDF全文

Kwee Siong Tew  Yun‐Chen Chang  Pei‐Jie Meng  Ming‐Yih Leu  David C Glover 《Aquaculture Research》2016,47(9):2748-2756

Coral reef fish are collected from the wild and exhibited in aquaria worldwide. Some of the fish spawn in captivity; however, the eggs are usually neglected. In this study, we collected the eggs spawned naturally in the exhibit tanks, hatched and cultured them indoor in 2000‐L fibreglass tanks (initial density = 18 000 egg tank^?1). We applied an inorganic fertilization method commonly used in freshwater fish culture in raising these coral reef fish larvae. We maintained inorganic phosphorus concentration at 100 μg P L^?1 and inorganic nitrogen at 700 μg N L^?1 daily in the fertilized group (n = 4), while the control tanks (n = 4) were fed with rotifers (10 ind mL^?1). Chlorophyll a at particle sizes of both 0.45–20 μm and >20 μm, as well as NH₃‐N, NO₃‐N, and PO₄‐P concentrations were significantly higher in the fertilized group than the control. Zooplankton in the size groups of 10–50 μm (mainly flagellates) and 50–100 μm (mainly ciliates) were abundant (about 10~60 ind mL^?1) during 3–7 days in fertilized tanks. The average larval fish survival rate at 21 day after hatch in fertilized group was consistently higher than the control in two trials. The experiments demonstrated that the inorganic fertilization approach can be successfully adapted for coral reef fish culture in an aquarium to achieve sustainable exhibits.  相似文献   

保持产量提高蕃茄品质的盐水灌溉     

米兹.  Y 杨戈 《干旱区研究》1992,9(3):21-27

以两种不同稀释浓度的海水(3和6西门子/米)滴灌“PClll”蕃茄,分别在第一片真叶(早期)和第一个裂果出现(晚期)时进行。一般而言,盐分提高了风味、可溶性固形物及糖的浓度,减少了色斑。因而提高了果实的总体品质,货架寿命未受盐处理的影响。最重要的发现是:在植物发育后期,用低浓度盐水灌溉,其总产量与对照相比无实质性的差异、达出口质量的产量相同,而果食的品味远比对照好。沙漠地区温室栽培的蕃茄,采用盐水灌溉的方法提高果食品质是可行的。  相似文献   

Structure and Management Issues of the Emerging Ornamental Fish Trade In Eritrea     

Tim M. Daw  Ginny C.C. Rogers  Paul Mapson  Jo E. Kynoch 《Aquarium Sciences and Conservation》2001,3(1-3):53-64

Following independence from Ethiopia in 1993, Eritrea resumed exploiting Red Sea and Arabian fish species for the ornamental trade in 1995 as a means to earn foreign exchange from sparsely exploited marine resources. This paper describes the findings of research conducted in 1997, in collaboration with the Eritrean Ministry of Fisheries. The capture, transport and export of aquarium fish were reviewed and potential impacts and the status of management were investigated through liaison with stakeholders and researchers. From 1995 to 1997 two companies exported approximately 60,000 fish per year, mainly to the USA, worth US$65,000 (export value). Seventy-five species (from 22 families) were exported. Damselfishes made up two-thirds of total exports but more valuable families (angelfishes and butterflyfishes) were more economically significant. To earn revenue for Eritrea, a 20% export tax was imposed, although this was calculated from declarations by the operators. The emerging nature of the trade allowed detailed monitoring by the Ministry of Fisheries. However, management efforts were constrained by a lack of capacity for enforcement and baseline research. Several potential effects of the trade exist but other, land-based impacts may be more pressing concerns for Eritrea's reefs. Research priorities for management are discussed as well as the implications of mariculture of Eritrean species by other nations.  相似文献   

Rearing of squid hatchlings, Heterololigo bleekeri (Keferstein 1866) up to 2 months in a closed seawater system     

Yuzuru Ikeda  Ikuko Sakurazawa  Kingo Ito  Yasunori Sakurai  & Gen Matsumoto 《Aquaculture Research》2005,36(4):409-412

  相似文献