基于Weibull分布的红砂岩颗粒崩解破碎演化规律     

张宗堂  高文华  张志敏  唐骁宇  邬俊 《岩土力学》2020,41(3):877-885

红砂岩在我国分布广泛，由于含水率的变化使其崩解破碎十分显著。采用湖南株洲地区的红砂岩样，进行室内静态与扰动崩解试验。基于Weibull分布建立了红砂岩颗粒崩解破碎级配曲线演化模型，分析了模型参数λ与k的意义。分析表明，Weibull分布参数λ与k的大小及变化速率体现了红砂岩颗粒崩解破碎的演化过程。在建立模型的基础上，求得了相对崩解比的计算公式，并验证了计算公式的正确性。依据试验结果与模型计算值，讨论了耐崩解性指数与崩解比的异同及所采用试验方法的不同对试验结果造成的影响。在已有成果的基础上，验证了Weibull分布模型应用于岩石颗粒崩解破碎演化过程的可行性。  相似文献   

黄土热释光测年问题     

李秉成 《地球科学与环境学报》1998,20(4):41

回顾了热释光测年的简史,展示了我国黄土热释光测年的现状,表明尚达不到建立可靠而精确的地质年代标尺的要求,其原因在于问题的复杂性,而主要是样品的残余热释光信号问题。目前,红外光释光法的初步成功显示了良好的前景。  相似文献   

Some applications of humidity profiles estimated from INSAT infra red digital cloud imagery data     

Onkari Prasad  Sant Prasad  Kanti Prasad  R. R. Kelkar 《Journal of Earth System Science》1998,107(1):5-18

Moisture profiles have been estimated over the region bounded by the latitudes 40°N and 40°S and longitudes 30°E to 130°E using INSAT digital infra red cloud imagery data. The representativeness of these profiles in representing moisture field associated with the development and movement of synoptic scale systems during the period September 15th, 1996 to March 31st, 1997 has been examined. It has been shown that the changes in the moisture field associated with the withdrawal of the southwest and northeast monsoons from the Indian sub-continent, development and movement of synoptic scale sytems (depressions, tropical cyclones and waves in easterlies) and equatorial troughs in the Indian Ocean could be clearly seen in humidity profiles. The initial development of tropical systems is first seen in the humidity field in the upper troposphere. These profiles could be used in monitoring the initial development and subsequent movement of tropical systems. Further the data on moisture distribution from the data gap regions of the Indian Ocean could be used as an additional source of moisture in numerical analysis and prognosis.  相似文献   

超临界萃取技术在生物资源开发和有机废水处理中的应用研究   总被引：1，自引：0，他引：1  

刘华 《矿物岩石地球化学通报》1998,(1)

超临界萃取技术在生物资源开发和有机废水处理中的应用研究＠刘华￥中国科学院地球化学研究所超临界ＣＯ＿２萃取,有机废水处理,珊瑚姜油,辣椒色素超临界萃取技术在生物资源开发和有机废水处理中的应用研究刘华（中国科学院地球化学研究所,贵阳５５０００２）收稿日期：１９...  相似文献   

Research on red tide occurrences using enclosed experimental ecosystems in west Xiamen Harbor, China—Relationship between various factors and red tide occurrences     

Lin Yu  P. J. Harrison 《中国海洋湖沼学报》2000,18(2):148-156

A series of enclosed ecosystem experiments were conducted in a land-based tank near the seaside of West Xiamen Harbor. The results of experiments conducted in different seasons and years showed a repeatable phytoplankton succession. In this relatively stable ecosystem with added nutrients and trace metals, diatoms dominated initially, dinoflagellates dominated in the later stage, and dinoflagellate red tides eventually occurred. Vitamin B₁₂ enrichment may speed up this succession process. Stirring the water column could stop this process. Soluble Mn at a level of 3–4 μg/L in seawater, which also is the existing concentration of soluble Mn in Xiamen Harbor seawater, is sufficient for the multiplication of algae and occurrence of red tide. The present study showed that excessive soluble Mn in Xiamen Harbor cannot cause red tide, and that Fe was one of the important factors causing diatiom red tide in this present study. Project 39570145 supported by NSFC.  相似文献   

STUDY OF RED TIDE PREDICTION MODEL FOR THE CHANGJIANG ESTUARY     

王正方  吕海燕  张庆  卢勇  曾江宁  周青松 《中国海洋湖沼学报》2000,18(4):350-354

ＩＮＴＲＯＤＵＣＴＩＯＮＡｑｕｉｃｕｌｔｕｒｅａｒｅａｒｅｄｔｉｄｅｓｉｇｎａｌｓｏｃｅａｎｐｏｌｌｕｔｉｏｎａｎｄｄｉｓａｓｔｅｒ.Ａｌｔｈｏｕｇｈｅｎｖｉｒｏｎｍｅｎｔｓｃｉｅｎｔｉｓｔｓｈａｖｅｃｏｎｄｕｃｔｅｄｍａｎｙｉｎ ｄｅｐｔｈｒｅｓｅａｒｃｈｅｓｏｎｔｈｅｃａｕｓｅａｎｄｆｏｒｍａｔｉｏｎｍｅｃｈａｎｉｓｍｏｆｒｅｄｔｉｄｅ ,ｍａｎｙｏｆｉｔｓａｓｐｅｃｔｓａｒｅｓｔｉｌｌｕｎｋｎｏｗｎｂｅｃａｕｓｅｒｅｄｔｉｄｅｉｓａｃｏｍｐｌｅｘｐｈｅｎｏｍｅｎｏｎａｎｄｔｈｅｅｃｏｌｏｇｉｃ…  相似文献   

海洋产油真菌的简便初筛   总被引：1，自引：0，他引：1  

秦艳红  叶德赞 《台湾海峡》2010,29(1):128-134

选取分离自大洋、深海的28株酵母和143株霉菌，采用在培养基中添加尼罗红比较表观荧光强度的方法来筛选出酵母2株和霉菌7株，但菌体呈红色的酵母（17株）及菌丝为黑色的霉菌（28株）不适用于此法；通过单位DD鲫荧光强度的高低筛选出1株菌落为微红色的酵母，产油性能好于用第一种方法挑选出的2株酵母，且菌体颜色对结果并无影响，但只适合筛选酵母．通过上述2种方法筛选出高油脂菌株，大多来源于深海．  相似文献   

Immunotoxicity effect of benzo[α]pyrene on scallop Chlamys farreri     

Lin Zhang  Luqing Pan  Jing Liu 《中国海洋大学学报(英文版)》2009,8(1):89-94

The toxic effects of benzo[α]pyrene (B[α]P) at different concentrations (0.1, 0.5, 1, 2.5 and 7.5 μgL⁻¹) on scallop (Chlamy farreri) immune system were studied. The results showed that B[α]P had significant toxic effects on the haemocyte counts, neutral red uptake, phagocytosis, bacteriolytic and antibacterial activity (P<0.05), while the seawater control and acetone control had no significant differences. The haemocyte counts, neutral red uptake, phagocytosis and bacteriolytic activity in all B[α]P treatment groups as well as antibacterial activity in groups of 0.5, 1, 2.5 and 7.5 μgL⁻¹ B[α]P decreased significantly (P<0.05). Some of these indices tended to be stable on the sixth day and others on the ninth day, and the indices showed clear time- and concentration-response to B[α]P. Bacteriolytic activity in 0.1μgL⁻¹ B[α]P treatment group and antibacterial activity in 0.1 μgL⁻¹ and 0.5 μgL- B[α]P treatment groups increased at the beginning of exposure and reached their peaks on day 1 and day 6, respectively. Following that, both activities decreased gradually and became stable after day 9. When all the indices reached stability, they were significantly lower than those in control group (P<0.05), except for antibacterial activity in 0.1 μgL⁻¹ B[α]P treatment group (P>0.05). Thus, B[α] has evident toxic effects on scallop immune system, which supports the view that a relationship exists between pollution and immunomodulation in aquatic organisms.  相似文献   

Skeletal linear extension rates of the foliose scleractinian coral Merulina ampliata (Ellis & Solander, 1786) in a turbid environment     

Angela Dikou 《Marine Ecology》2009,30(4):405-415

Skeletal linear extension rates of a foliaceous, IndoPacific, skiophilous, heterotrophic, scleractinian Merulina ampliata (Ellis & Solander 1786) were obtained along a sediment/nutrient load gradient at the southern islands of Singapore. Measurements were made during November 1999– November 2000 using the alizarin red‐S staining technique. Suspended particulate matter concentration (r²_adj = 0.76), turbidity (r²_adj = 0.59), the organic content of suspended sediments (r² = 0.50), and nitrite‐nitrate concentration (r²_adj = 0.50) were significant predictors of the skeletal linear extension rate of M. ampliata. Maximum linear extension growth rates of M. ampliata (mean ± SD: 1.43 ± 0.67–3.26 ± 0.59 cm·year^?1) were comparable to 15‐year‐old accounts at the same research sites, indicating adaptation to low‐light, high‐sediment waters.  相似文献   

海洋经济红藻江蓠科的分类研究现状及存在的问题          下载免费PDF全文

丁兰平  杨楠  刘金梅  姜晶晶  黄冰心 《应用海洋学学报》2020,39(1):144-151

江蓠科红藻是重要的经济海藻,用途十分广泛。然而,近年来受分子生物学技术引入等的影响,其分类学地位引起了极大争议。针对这个问题,本研究以争议比较大的江蓠属(Gracilaria)、拟江蓠(龙须菜)属(Gracilariopsis)和多穴藻属(Polycavernosa)为对象,总结归纳了其物种多样性、国内外研究进展、存在的问题、学者试图解答的问题以及部分自己的研究结果。以期为该类群的研究提供相对详细、客观的参考数据。  相似文献