Using Stressor–Response Models to Derive Numeric Nutrient Criteria for Lakes in the Eastern Plain Ecoregion,China          下载免费PDF全文

Yali Zhang  Shouliang Huo  Chunzi Ma  Xiang Li  Hongliang Liu 《洁净——土壤、空气、水》2014,42(11):1509-1517

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不同环境条件下无菌和自然带菌波吉卵囊藻生长的比较     

李静红  黄翔鹄  李色东  李活 《广东海洋大学学报》2010,30(1):88-92

比较不同温度、光照及海水相对密度条件下无菌与自然带菌波吉卵囊藻(Oocystis borgei)生长的差异。结果表明:在20℃时,无菌藻的比增长率(μ)和叶绿素a(Chla)含量分别为0.398d-1和0.117mg/L,均显著高于带菌藻(P<0.05),在28和35℃时,无菌藻和带菌藻生长无显著性差异(P>0.05);在照度为16μmol·m-2·s-1时,无菌藻平均比增长率μ和Chla含量分别为0.345d-1和0.123mg/L,均显著高于带菌藻(P<0.05),在照度为39和88μmol·m-2·s-1条件下,无菌藻和带菌藻生长无显著性差异(P>0.05);在海水密度为1.007、1.020和1.030g/mL时,无菌藻和带菌藻的生长均无显著性差异(P>0.05),μ和Chla含量分别为0.325～0.374d-1和0.085～0.133mg/L。  相似文献   

Preparation and biological efficacy of haddock bone calcium tablets     

霍健聪  邓尚贵  谢超  童国忠 《中国海洋湖沼学报》2010,28(2):371-378

To investigate the possible use of waste products obtained after processing haddock, the present study prepared haddock bone calcium powder by NaOH and ethanol soaking (alkalinealcohol method) and prepared haddock bone calcium tablets using the powder in combination with appropriate excipients. The biological efficacy of the haddock bone calcium tablets was investigated using Wistar rats as an experiment model. Results show that the optimal parameters for the alkalinealcohol method are: NaOH concentration 1 mol/L, immersion time 30 h; ethanol concentration 60%, immersion time 15 h. A mixture of 2% polyvinylpyrrolidone in ethanol was used as an excipient at a ratio of 1:2 to full-cream milk powder, without the use of a disintegrating agent. This process provided satisfactory tablets in terms of rigidity and taste. Animal studies showed that the haddock bone calcium tablets at a dose of 2 g·kg⁻¹·d⁻¹ or 5g·kg⁻¹·d⁻¹ significantly increased blood calcium and phosphorus levels and bone calcium content in rats. Therefore, these tablets could be used for calcium supplementation and prevent osteoporosis. Although the reasons of high absorption in the rats fed with haddock bone calcium tablets are unclear, it is suggested that there are some factors, such as treatment with method of alkaline-alcohol or the added milk, may play positive roles in increasing absorption ratio.  相似文献   

太阳2cm射电爆发精细结构的形态分析     

高正民  李子英  霍采平  范英 《中国天文和天体物理学报》1992,(2)

本文介绍了北京师范大学天文系,在2cm波段上观测到的太阳射电精细结构(FS).这些FS都是叠加在微波爆发上的.其中重点对1990年5月23日与AR6063活动区成协的一个47GB型微波大爆发上叠加的FS的形态特征进行了分析.计算了几个有关的参数,并对结果进行了简单的讨论.  相似文献   

2cm波段太阳射电爆发中的时间精细结构     

高正民  李子英  霍采平  范英 《中国天文和天体物理学报》1991,(3)

本文首次报道了在1990年4—5月期间,2cm波段上叠加在微波爆发上的时间精细结构。  相似文献   

Three-dimensional ionospheric tomography by an improved algebraic reconstruction technique   总被引：2，自引：3，他引：2  

Debao Wen  Yunbin Yuan  Jikun Ou  Xingliang Huo  Kefei Zhang 《GPS Solutions》2007,11(4):251-258

An improved algebraic reconstruction technique (IART) is presented for the tomographic reconstruction of ionospheric electron density (IED). This method applies the total electron content (TEC) measurements to invert the spatial distribution of the IED from a set of apriori IED distributions. In this new method, a data-driven adjustment of the relaxation parameter is performed to improve the computation efficiency and image quality of the classical algebraic reconstruction technique (ART). In addition, the new algorithm is also combined with ionospheric space discretization technique to simplify the inversion of IED, and it applies CHAMP occultation data to improve the vertical resolution. A numerical simulation experiment is carried out to validate the reliability of the new method. It is then applied to the inversion of IED from real GPS data. Inverted results show that the IART algorithm has better accuracy and efficiency than the conventional ART algorithm. The reliability of the IART algorithm is also validated by ionosonde data recorded at Wuhan station.  相似文献   

城门山及武山铜矿床的硫同位素研究   总被引：1，自引：0，他引：1  

赵瑞  谢奕汉  姚御元  霍卫国 《地质科学》1985,(3):251-258

地质概况江西城门山矿床和武山矿床是长江中下游铁铜成矿带大冶-九江成矿亚带东南部位的两个与斑岩有成因关系的铜矿床。在地质构造上,前者处于九江-瑞昌东西向拗陷带中的长山-城门湖背斜倾伏端的北翼,后者处在横立山-黄桥向斜东端的北翼。两矿区的地层分布相似,主要是志留系至三叠系地层。其中,泥盆系上统五通组砂岩及石炭系中统黄龙组灰岩与矿床关系密切。  相似文献   

Tectonic environment of mesozoic volcanic rocks in the coastal areas of SE China   总被引：1，自引：0，他引：1  

Huo Yuhua 《中国地球化学学报》1986,5(3):195-205

Mesozoic volcanic rocks in the coastal areas of SE China consist predominantly of rhyolites and pyroclastic rocks, obviously distinct from island-arc volcanic rocks which consist mainly of andesitic rocks. Volcanic rocks in these areas mostly belong to the cale-alkaline series, and their geochemical characteristics are dissimilar to those of island-arc rocks. For example, the SiO₂ content varies greatly from 47 to 81 percent, Fe₂O₃+FeO/MgO>2, K₂O/Na₂O>0.8, the contents of Rb, Sr, Ba, Th, U, and Zr are higher than those of island-arc calc-alkaline rocks, and K/Rb <400. Andesite in the coastal areas of SE China, for the most part, belongs to the alkali-calcic series (CaO<Na₂O+K₂O), typical of a continental tectonic environment. Geotectonic studies have shown that the ancient Eurasian continental margin in Mesozoic times was located to the east of the line linking Japan and Taiwan, and the present location of Mesozoic rocks is not an island-arc. area. In the light of their characteristically high alkalinity, the Mesozoic volcanic rocks are considered to have been formed in a continental environment rather in an island-arc environment. Their formation was controlled by a compresso-shear tranform fault system.  相似文献   

A mathematical study ofcyrtograptus sakmaricus lineage     

Huo Shicheng  Shu Degan 《Mathematical Geosciences》1983,15(6):701-708

On the basis of a mathematical study of the Cyrtograptus sakmaricuslineage, all members of this lineage have the shape of a logarithmic spiral, which may be expressed in terms of the equation ρ = A ? e^aθ.Tightness of coiling and the shape of the volution are determined by the value of a.This value, which controls the form and function of cyrtograptids, increases in stratigraphically higher members and may be used as a basis for dividing the genus Cyrtograptusinto various species.  相似文献   

四川盆地西北部中二叠统栖霞组白云岩特征及成因探讨   总被引：1，自引：0，他引：1  

李 博王兴志  谢圣阳冯明友  杨雪飞霍 飞 王雅萍 《地质科学》1958,55(1):183-199

白云岩特征及其形成机制的研究对白云岩化理论与白云岩储集层勘探具有重要意义。本文以四川盆地西北部中二叠统栖霞组白云岩为研究对象,通过野外剖面及岩心观察并采用铸体薄片、阴极发光、地球化学分析等方法对该段白云岩特征及成因进行研究。结果表明川西北地区栖霞组白云岩主要表现为块状晶粒白云岩、角砾状白云岩及斑状白云岩3种类型;碳同位素为正低值,氧同位素为负值,反映出其成岩过程中伴有早期淡水参与。结合工区构造沉积背景,对比以往经典白云岩化模式,发现四川盆地西北部中二叠统栖霞组白云岩化成因模式具有一定自身特点。通过对Folk “镁笼效应”理论进行延伸,认为栖霞组白云岩化模式在纵向上分为淡水渗流带、混合渗流带、混合潜流带及海水潜流带4个区带,其中混合渗流带和混合潜流带是白云岩发育的主要位置。在混合渗流带中,淡水与海水交替进入,未完全成岩的海洋沉积物质在成岩过程中受到淡水冲洗导致大量镁离子随淡水流入下部地层,而后又有海水携带镁离子进行补给,这为白云石形成提供了有利条件;混合潜流带内不断进入的混合流体携大量镁离子使得该带具有较高Mg/Ca值;而地幔上涌造成的地温升高克服了白云石形成的动力学屏障,有效促进了白云岩的形成。  相似文献