粘性土体断裂韧度KIC研究   总被引：2，自引：0，他引：2  

张振国  丁金粟 《岩土力学》1993,14(3):47-52

本文提出了利用矩形横截面单侧开缝土试件测定粘性土体断裂韧度K_(IC)的方法,并通过对黄河小浪底水利枢纽工程粘性土试样的K_(IC)值测定,研究了粘性土的干容重、含水量变化对K_(IC)的影响。  相似文献   

地电阻率短临前兆异常的判定方法研究   总被引：6，自引：0，他引：6  

王志贤  彭远黔 《地震》1994,(1):88-96

本文用一阶差分和相干加权计算等方法对地电阻率观测资料进行处理，其结果较好地突出了短临前兆异常。进而研究了地电阻率短临前兆变化特征及其短临预报指标；采用归一化方法将电阻率各异常参量转换为地震前兆信息量，为多种前兆方法进行综合跟踪预报提供了必要的基础资料。  相似文献   

Three nonparametric techniques for the optimum discretization of quantitative geological variables     

Guocheng Pan  DeVerle P. Harris 《Mathematical Geology》1990,22(6):699-722

Three nonparametric techniques for the optimum discretization of quantitative geological features are proposed and demonstrated. The three methods are: isolated weight, entropy information, and rank correlation. Optimum discretization plays important roles in solutions to the following geoscience problems: (1) signal/noise separation and delineation of meaningful anomalies and other geofields related to mineral targets; (2) selection of those geological variables that explain variations in mineral resources; (3) determination of the best subintervals of values for a variable with respect to mineralization; (4) enhancement of certain complex and concealed information of a geofeature about its correlation with magnitude of mineralization; and (5) unification of diverse geodata so that these data can be integrated and analyzed.  相似文献   

High Ash Content in Net-Plankton Samples from Shallow Coastal Water: Possible Source of Error in Dry Weight Measurement of Zooplankton Biomass   总被引：2，自引：0，他引：2  

Norio Nagao  Tatsuki Toda  Kazutaka Takahashi  Koji Hamasaki  Tomohiko Kikuchi  Satoru Taguchi 《Journal of Oceanography》2001,57(1):105-107

Annual examination of net-plankton biomass in dry weight, ash-free dry weight, organic carbon, and nitrogen weight at the Manazuru harbor, central Japan revealed that net-plankton samples from shallow coastal water contained considerable amount of ash (53±13% of dry weight) which would be caused by contamination of inorganic materials from re-suspendion of sediments, terrestrial runoff and chain-forming diatoms. Therefore, in coastal water, dry weight is inadequate fro determination of zooplankton biomass in volving the possibility of over-estimation. Practical estimation of net-plankton biomass in shallow coastal waters, ash-free dry weight, organic carbon, and/or nitrogen are more adequate.  相似文献   

海藻多糖分子量及其分布测定Ⅰ——“872”样品分子量的测定和K·α常数的标定     

范慧红  管华诗  周如真 《中国海洋大学学报(自然科学版)》1992,(Z1)

对海洋多糖类药物—“872”样品,采用乙醇沉淀分级法得到的5个不同分子量级份(Ⅰ～Ⅴ)。以粘度法测定5个级份特性粘数[η];用激光小角光散射仪(LALLS仪)测定了各级份的重均分子量M_w和第二维利系数A_2;标定出“872”样品的Mark Houwink公式。测得872样品各级份/特性粘数。  相似文献   

交通地理网络分析模型的实现     

靳军  王沫  王东 《海洋测绘》2006,26(6):28-30,61

首先介绍了网络分析的概念,接着介绍了交通网络的基本要素,然后建立了交通网络的模型,通过确定影响交通体系中网络流的因素,实现了最优路径的选择,最后用具体的数据验证了模型的合理性。  相似文献   

海带浸泡液腐植质的分离及其性质     

纪明侯  张鸿声 《海洋与湖沼》1992,23(3):302-311

对海带综合利用生产中剩下的浓缩浸泡液所含腐植质进行了分离,并对分离出的腐植酸、富里酸和乙醇可溶物三级分做了化学表征和性质研究,包括三级分的得率、紫外和红外光谱分析,元素、官能团、氨基酸和总糖含量分析,分子量分布,以及它们对鱼卵生长和褐藻酸钠粘度的影响。  相似文献   

Taille et age au debut de la metamorphose chez la sole (Solea solea (L.)) du golfe de Gascogne     

Amara  Rachid; Lagardere  Francoise 《ICES Journal of Marine Science》1995,52(2):247-256

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Use of carbon rather than dry weight to assess the DNA content and nutritional condition index of sole larvae   总被引：1，自引：1，他引：1  

Bergeron  Jean-Pierre; Ruyet  Jeannine Person-Le; Koutsikopoulos  Constantin 《ICES Journal of Marine Science》1997,54(1):148-151

  相似文献   

Dissolved Organic Matter in Oceanic Waters   总被引：13，自引：0，他引：13  

Hiroshi Ogawa  Eiichiro Tanoue 《Journal of Oceanography》2003,59(2):129-147

The amount of information on oceanic dissolved organic matter (DOM) has increased dramatically in the last decade thanks to the advances in chemical characterization. This information has supported the development of some novel and important ideas for DOM dynamics in the ocean. Consequently, we have a better understanding of the importance of DOM in oceanic biogeochemical cycles. Here we review studies published mainly during 1995–2001, synthesize them and discuss unsolved problems and future challenges. The measurement, distribution and turnover of dissolved organic carbon (DOC) are presented as the bulk dynamics of the oceanic DOM. The size spectrum, elemental composition, and chemical compositions at molecular and functional group levels are described. The mechanisms proposed for the survival of biomolecules in DOM are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献