直接滴定法测定鱼油中酸价的研究   总被引：1，自引：0，他引：1  

翟毓秀  尚德荣 《海洋科学》1997,21(5):65-66

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围隔生态系富磷及油污染对叶绿素a变化的影响     

李宝华  陈尚  朱明远 《海洋科学进展》2001,19(4):30-36

根据 1 997年 1 0月和 1 998年 5月 2次围隔生态系实验中获得的叶绿素 a资料 ,分析了在富磷围隔实验中不同粒径叶绿素 a的变化及各自所占的百分比以及油污染对叶绿素 a变化的影响。实验结果表明 :在 P- meso中 ,1 0月份 Chl- a的含量每天以 1 0～ 1 6 μg/L的速度呈指数生长 ,最高达到 74.89μg/L;大于 2 0μm的大型浮游植物是浮游植物总生物量的主要贡献者。5月份 Chl- a含量在加磷后增长的速度每天为 3～ 8μg/L,较 1 0月份慢 ;2～ 2 0 μm和 GF/F～ 2μm的小型和微型浮游植物是浮游植物总生物量的主要贡献者  相似文献   

Relationship between petroleum hydrocarbon and plankton in a mesocosm experiment   总被引：4，自引：0，他引：4  

Shi Xiaoyong  Wang Xiulin  Han Xiurong  Jiang Yu  Zhu Mingyuan  Chen Shang  Koshikawa Hiroshi 《海洋学报(英文版)》2001,20(2):231-240

~IOXWith economic development and consumer demand, oil pollutants have been one of themain marine pollutants in the coastal regal Of China. The oil-contaminated area incrsharply to 69% in 1995 and its average criterion index reached up to 2. 17 in the ChangjiangEstuary (NBEP, 1996). TO assess the influences Of the oil POllutants on the marine ~tern, it is neceSSary to develOP a mathematical kinetic model of the tranSport, distribution andfate in the marine ~teln, espeCially to esthate …  相似文献   

Protection, Pollution Prevention and Control of Environment in Construction Stage     

Julie Q. Shang 《Marine Georesources & Geotechnology》2003,21(3):227-235

The proposed Taiwan Strait Tunnel will raise numerous challenges for environmental professionals. The environmental issues must be incorporated in the preliminary study, planning, design, and construction of the works and be addressed consistently throughout all phases of the project. In this article, the environmental issues that will be encountered in the construction stage are discussed, including environmental impact assessment, environmental monitoring, and specific environmental issues during construction such as spoil handling, air quality and noise control, drainage, and health and safety. The experience and practice of handling environmental issues during the construction English Channel Tunnel are reviewed throughout the discussion.  相似文献   

利用小波重构合成地震波方法及特性研究   总被引：1，自引：0，他引：1       下载免费PDF全文

邹立华  刘爱平  杨宏  柴新建  尚歆  戴素亮  董博 《地震学报》2007,29(6):635-642

针对傅里叶变换合成地震波理论的不足，提出一种利用小波重构合成地震波的方法. 以控制频带能量为标准，推导了合成地震波的公式. 运用抗震设计规范中的相关设计参数合成了地震波，并分析研究了在合成地震波时小波函数基的选取方法和阻尼比对合成结果的影响. 结果表明，用小波重构合成的地震波能够反应地震波基本特性和场地特征周期，并具有很好的时频非平稳性.   相似文献   

利用EXCEL软件进行线性回归分析          下载免费PDF全文

尚新利 《气象与环境科学》2007,30(B09):188-189

介绍了EXCEL数据处理软件在一元和多元线性回归分析中的应用方法及实现技巧。  相似文献   

四维变分资料同化     

杜川利 《山西气象》2003,(3):1-6

本文选用数值预报产品与朔州市6区(县)夏季(6月至8月)降水资料。采用最优子集圆归方法。研究朔州市分县分级降水预报指导产品。用以提高朔州市汛期降水天气的客观预报水平。  相似文献   

Fractionation of major elements between coexisting H₂O-saturated silicate melt and silicate-saturated aqueous fluids in aluminosilicate systems at 1-2 GPa     

Bjorn O Mysen  Jessica Shang 《Geochimica et cosmochimica acta》2003,67(20):3925-3936

From experimental data in the systems Na₂O-Al₂O₃-SiO₂-H₂O, K₂O-Al₂O₃-SiO₂-H₂O at 1100°C, and CaO-Al₂O₃-SiO₂-H₂O at 1200°C in the 1-2 GPa pressure range, the solution behavior of the individual oxides in coexisting H₂O-saturated silicate melts and silicate-saturated aqueous fluids appears to be incongruent. Recalculated on an anhydrous basis, in the CaO-Al₂O₃-SiO₂-H₂O system, CaO^fluid/CaO^melt < 1, whereas in the Na₂O-Al₂O₃-SiO₂-H₂O and K₂O-Al₂O₃-SiO₂-H₂O systems, K₂O^fluid/K₂O^melt and Na₂O^fluid/Na₂O^melt both are greater than 1. The aqueous fluids are depleted in alumina relative to silicate melt.In the Na₂O-Al₂O₃-SiO₂-H₂O, K₂O-Al₂O₃-SiO₂-H₂O, and CaO-Al₂O₃-SiO₂-H₂O systems, fluid/melt partition coefficients for the individual oxides range between ∼0.005 and 0.35 depending on oxide, bulk composition and pressure. The alkali partition coefficients are about an order of magnitude higher than that of CaO. Alumina and silica partition coefficient values in the CaO-Al₂O₃-SiO₂-H₂O system are 10-20% of the values for the same oxides in the Na₂O-Al₂O₃-SiO₂-H₂O and K₂O-Al₂O₃-SiO₂-H₂O systems.Positive correlations among individual partition coefficients and oxide concentrations in the aqueous fluids are consistent with complexing in the fluid that involves silicate polymers associated with alkalis and alkaline earths and aluminosilicate complexes where alkalis and alkaline earths may serve to charge-balance Al³⁺, which is, perhaps, in tetrahedral coordination. Alkali aluminosilicate complexes in aqueous fluid appear more stable than Ca-aluminosilicate complexes.  相似文献   

我国干旱区洪水灾害基本特征：以新疆为例   总被引：9，自引：0，他引：9  

张国威  何文勤 《干旱区地理》1998,21(1):40-48

依据新疆自然和社会环境,分析了新疆洪水及其洪灾的形成,季节分布,年际变化,地区分布等主要特征,并提出对洪水灾害的防御对策。  相似文献   

21cm波段ms级太阳射电爆发形态分析     

胡汉明  尚琼珍 《天文学报》1998,39(1):106-110

本文利用10米天线上21cmms级连续无间隙快速记录系统,在第22周太阳峰年期间观测到大量的分米波段的太阳射电尖峰辐射的快速活动资料,对这些资料进行分析、比对发现尖峰辐射的快速活动至少包括：毛刺型、缓变型、缓变脉冲型、脉冲型、开关型．同时也对太阳射电尖峰辐射与其它共生现象进行分析,并对尖峰辐射的形态进行了简单的讨论．  相似文献