MS2000激光粒度仪测量第四纪沉积物粒度的定量进样研究   总被引：1，自引：0，他引：1  

李华勇  唐倩玉  张虎才  李婷  段立曾 《海洋地质与第四纪地质》2020,40(2):200-207

粒度是第四纪古气候与古环境重建的常用替代指标,目前通常采用Mastersizer2000激光粒度仪进行分析,该测试仪器优点是速度快、精度高、重复性好,缺点是进样过程未实现定量化,对部分沉积样品的分析结果出现一定的随机性和不确定性,分析结果易产生人为误差。为探究样品量和进样方法对测试结果可能造成的影响,本研究选取6类代表性第四纪松散沉积物,预处理后分别采用倾倒法、吸管法及定量进样法进行多次重复实验。结果显示:粒度组分越单一,不同进样方法造成的结果误差越小;如果沉积物含有多个粒度组分,而预处理样品量过多,倾倒法容易造成粒度结果偏细,吸管法往往造成实验结果偏粗,定量进样法实验结果居于前两者之间。采用烧失量法计算沉积物中碳酸盐、有机质含量,结合马尔文激光粒度仪测试原理及多次定量重复实验结果,计算了一次实验所需样品量,发现其与中值粒径和碳酸盐、有机质(合称杂质)含量呈线性正相关。根据该线性关系式,在分析第四纪沉积物中值粒径范围及杂质含量的前提下,可计算一次测试所需样品量,将全部预处理后样品倒入测试烧杯中,可有效避免样品量和进样方法对样品粒度实验结果造成的误差。  相似文献   

Experimental study on low temperature performance of polymer drilling mud agents     

ZHAN Jiajia  XU Huiwen  CAI Hongliang .College of Construction Engineering  Jilin University  Changchun  China .China Water Northeastern Investigation Design  Research Co.Ltd  Changchun  China 《东北亚地学研究》2009,12(1):32-35

Drilling fluid additives has a major impact on rheology behavior and other performances of the drilling fluid. The key to low temperature drilling fluids is choosing antifreeze and polymer agent which have a strong ability in resisting low temperature. On the basis of determining glycol as antifreeze agent, the low-temperatureperformance and capacities of anti-collapse of regular validity mud agents have been studied, the mechanism of anti-caving of the partially hydrolyzed polyacrylamide （PHPA）, polypropylene potassium （KPA） and PAC-141 polymer additives have been also analyzed. A pilot study of compatibility between ethylene glycol and the polymers has educed that the polymers, ethylene glycol and inorganic salt are compatible, and they can significantly reduce the freezing point of drilling fluid. Anti-collapse ability of the drilling mud is the results of synergistic action among the agents.  相似文献   

Experimental Study on the Interspecific Interactions Between the Two Bloom-Forming Algal Species and the Rotifer Brachionusplicatilis     

XIE Zhihao  XIAO Hui  TANG Xuexi  CAI Hengjiang 《青岛海洋大学学报(英文版)》2009,(2):203-208

The interspecific interactions between the rotifer Brachionus plicatilis and two harmful algal blooms （HAB） species were investigated experimentally by single culture method. B. plicatilis population and the growth of the two algae were compared at different algal cell densities. The results demonstrated that the B. plicatilis obtained sufficient nutrition from Prorocentrum donghaiense to support net population increase. With exposure to 2.5×10^4 cells mL^-1 of P. donghaiense, the number of B. plicatilis increased faster than it did when exposed to other four algal densities （5, 10, 15 and 20 × 10^4 cells mL^-1）, and the increase rate of B. plicatilis population （r） at this algal density was 0.104 ± 0.015 rd^-1. Cell densities of P. donghaiense decreased due to the grazing of B plicatilis. In contrast, Heterosigma akashiwo had an adverse effect on B. plicatilis population and its growth was largely unaffected by rotifer grazing. In this case, B. plicatilis population decreased and H. akashiwo grew at a rate similar to that of the control.  相似文献   

我省国家出资地质勘查项目样品实验测试管理办法出台     

佳妍 《黑龙江国土资源》2009,(9):30-30

经黑龙江省国土资源厅发布的《黑龙江省国家出资地质勘查项目样品实验测试管理办法》（以下简称《办法》）自6月16日开始实施。至此,全省国家出资地质勘查项目样品实验测试工作步入规范轨道,为找大矿、找好矿,实现找矿突破奠定了基础。  相似文献   

Sea experiments of the Underway Conductivity-Temperature-Depth prototype made in China     

Xiangzhou Song  Hui Li  Xiaopei Lin  Xueen Chen  Xinshun Guo  Jiwei Tian 《中国海洋大学学报(英文版)》2009,8(4):409-415

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‘Initial＇ Soil Moisture Effects on the Climate in China- A Regional Climate Model Study     

SHI Xueli 《中国海洋大学学报(英文版)》2009,8(2)

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Experimental Study on the Interspecific Interactions Between the Two Bloom-Forming Algal Species and the Rotifer Brachionus plicatilis     

XIE Zhihao）  ）  XIAO Hui）  TANG Xuexi）    CAI Hengjiang） ） Marine Ecology Laboratory  Ocean University of China  Qingdao  P. R. China ） Faculty of Life Science  Biotechnology  Ningbo University  Ningbo  P. R. China 《中国海洋大学学报(英文版)》2009,8(2)

The interspecific interactions between the rotifer Brachionus plicatilis and two harmful algal blooms(HAB) species were investigated experimentally by single culture method. B. plicatilis population and the growth of the two algae were compared at different algal cell densities. The results demonstrated that the B. plicatilis obtained sufficient nutrition from Prorocentrum donghaiense to support net population increase. With exposure to 2.5×104 cells mL-1 of P. donghaiense,the number of B. plicatilis increa...  相似文献   

验证法处理密立根油滴实验探讨     

师文庆  吕楠  陈劲民 《广东海洋大学学报》2009,29(4):67-69

为了更好、更快地进行密立根油滴实验,减小实验中的误差,对常规处理密立根油滴实验数据的验证法进行分析研究,用分析后的结果反过来指导实验。通过适当选取密立根油滴实验中的平衡电压和下落时间,可以在一定范围内减小实验误差,有利于尽快锁定平衡电压,快速准确的完成实验的测量,节约实验时间。  相似文献   

潍坊市国土资源局全力推进依法行政工作     

张永田  宋继山 《山东国土资源》2009,25(1)

近年来,潍坊市国土资源依法行政工作,按照国土资源部、山东省国土资源厅<全面推进依法行政规划(2006-2010年)>确定的目标和措施,完善体系,创新方式,扎实推进,取得明显成效.  相似文献   

Interspecies competition for nutrients between Prorocentrum donghaiense Lu and Skeletonema costatum (Grev.) Cleve in mesocosm experiments   总被引：1，自引：1，他引：0  

ZHU Mingyuan  XU Zongjun  LI Ruixiang  WANG Zongling  SHI Xiaoyong 《海洋学报(英文版)》2009,28(1):72-82

Three mesocosm experiments were conducted in the East China Sea during blooms of Prorocentrum donghaiense Lu in May of 1998, 2002 and 2003 to examine the role of nutrients in the formation of these harmful algae blooms (HABs). The results showed that there was interspecies competition between P. donghaiense and Skeletonema costatum (Grev.) Cleve. The cell number of P. donghaiense and S. costatum accounted for about 85% and 11% of the total cell number of phytoplankton respectively at the beginning of the experiment in May 1998. In May 2002, at the beginning of the experiment, the cell number of P. donghaiense accounted for 55%—66% of the total and S. costatum accounted for 32%—42%. The density of P. donghaiense and S. costatum was over 95% and 1%—5% respectively in May 2003. The results of these three mesocosm experiments showed that the dominant species in this specific community varied with different nutrient availability. Under lowphosphate conditions, the dominant species was P. donghaiense, while S. costatum became dominant in phosphatereplete cases. The average growth rate (1.08 d-1) of S. costatum in exponential growth phase was higher than that (0.39 d-1) of P. donghaiense. In the mesocosm, S. costatum predominated in the mesocosm by its rapid growth. When phosphorus was depleted, the cell number of S. costatum dropped rapidly, while P. donghaiense Lu decreased more slowly. The results from mesocosm experiment may explain why: (1) P. donghaiense bloom usually occurs in May, when phosphate concentration is low; (2) the bloom of S. costatum appears in early spring and summer time, when nutrients increase with increasing Changjiang River (Yangtze River) runoff; (3) the bloom of S. costatum is short and that of P. donghaiense Lu can last more than a month in the East China Sea.  相似文献