动刚度和动力触探在强夯地基检测中的应用     

王仁刚  阎韶兵  李佳 《海岸工程》2003,22(1):14-19

随着碎石土强夯地基的推广应用，解决如何对其进行快速有效地检测，提供其准确的强度及变形参数问题，具有重要的经济及安全意义。提出了一种利用平板静力载荷试验、动力触探、地基动刚度测试三种基本手段，建立相关数学模型，主要应用后两种手段进行联合检测的新思路。并将相关数学模型以经验公式的形式进行了总结，对碎石土强夯地基的检测具有指导意义。  相似文献   

海水中叶绿素提取方法的研究     

孙林枫  任素梅  李清 《中国海洋大学学报(自然科学版)》1988,(2)

本文讨论了用90％丙酮从海藻中提取叶绿素进行测定的三种提取方法(研磨法、浸泡提取法、超声波粉碎法)的最佳条件。并对三种提取方法的提取效率进行了比较。结果表明研磨法的提取效率较高,样品可立即测定,是一种较好的提取方法。 本文还讨论了不同离心力对叶绿素测定的影响。实验表明使用离心力为2000g的[X]—64—01型离心机可基本满足测定要求。  相似文献   

Prediction of Static Strength of Tubular T and X Joints Subjected to Axial Compression     

Chen Tieyun  Liu Pu Wang Deyu Professor 《中国海洋工程》1994,(1)

-The formulation of ring analogy method for the prediction of static strength (ductile collapse) of tubular T, X joints under axial compression based on the limit analysis of the ring with some assumptions is presented in this papaer. The regression formula for the effective length of the chord based on test results is established by means of the least square method. The results computed by the present semi-analytic formula are compared with previous results and test data. They are quite close to each other. The accuracy of the present formula depends on the reasonable selection of the effective length of the chord, which requires numerous test data.  相似文献   

蜾蠃蜚科(甲壳动物:端足目)一新属、新种     

任先秋 《海洋科学集刊》1997,(38):175-179

作者在鉴定1994年采自大连(北黄海)浅水和广东大亚湾的端足类(Amphipoda)标本中,发现了蜾蠃蜚科(Family Corophiidae)的一新属,即拟亮钩虾属 Genus Paraphotis，报告如下。新属、新种的模式标本保存在中国科学院海洋研究所。  相似文献   

Test and Numerical Analysis of the Constitutive Relation of a Diatomaceous Soft Rock     

Hong-Jian Liao  Li-Jun Su  Wu-Chuan Pu  Jian-Hua Yin 《Marine Georesources & Geotechnology》2003,21(3):183-200

A kind of diatomaceous soft rock and its constitutive model are studied in this article. Based on Yin and Graham's (1999) 3-D elastic viscoplastic constitutive model, the formulation under a triaxial stress state is established, and it is used to simulate the time-dependent stress-strain behavior and effective stress path of consolidated undrained triaxial tests of both normally consolidated and overconsolidated soft rock. The comparison between the model predictions and measured results shows that their agreement is good. This demonstrates that the constitutive equation established here can be used to simulate the time-dependent stress-strain behavior of the soft rock under triaxial stress condition.  相似文献   

台湾海峡三维风海流的数值模拟     

任华堂  刘钦政  吴辉碇 《海洋预报》2002,19(4):24-32

本文利用POM模式模拟了季风在台湾海峡引起的风海流以及三维流场结构。在冬季和夏季两种条件下，得出了季风引起的水位变化和三维流场结构。结果显示在冬季季风的作用下，海峡的东部北部发生减水而西南部产生增水；在夏季海峡北部产生增水而东南部和西南部产生减水，在科氏力的作用下，风海流表层流向偏于风向右侧。风海流在20m处形成的流场和底层流场本文也给出了模拟结果。流速的艾克曼螺线显示；该海域的流速并不随水深加大而一致减小，而是先减小至一定深度再稍微增大，然后继结衰减而零。  相似文献   

移植大叶藻提高池养对虾产量的研究   总被引：6，自引：0，他引：6  

任国忠  张起信  王继成  王大建 《海洋科学》1991,15(1):52-57

本实验首次用移植的方法在虾池内栽培大叶藻。结果表明,大叶藻可以净化虾池水质,改善虾池底质条件,丰富了饵料生物,促进了对虾的生长,提高了产量,每亩虾池的产量提高26.6％,纯利润提高190.5％。文章讨论了提高产量的原因。  相似文献   

中国近海的蔓足类 Ⅳ.花笼科     

任先秋 《海洋科学集刊》1984,(23):165-182

花笼亚目(Verrucomorpha)是蔓足类中较独特的一个类群,它的左右两侧売板不对称，一侧背板及楯板与壁板愈合而不能活动。它们一般栖息于深度超过100米的较深水域,固着于岩石、泥块、贝壳、海胆棘、海绵骨针或其他物体上,分布范围较广。这类动物一般不易采到,在我国过去尚未见报道。本文是我国海区花笼类第一篇研究报告。搞清它们的种类对分析底栖生物群落组成和分布具有一定的意义。 本文根据的材料是1975-1981年东海大陆架调查和1959-1960年全国海洋综合调查采集的底栖动物标本。由于深海调査采集不够,标本数量不多,共发现6种,分隶于花笼科 Family Verrucidae 花笼属 Genus Verruca 的4个亚属,皆为我国首次记录。该6种栖息的水深从110米到2150米,其中驼背花笼 Verruca( Altiverruca) gibbosa为世界各大洋的广布种；雕板花笼 Verruca(Metaverruca) sculpta为分布于三大洋的环热带种；其余4种为印度一西太平洋暖水种。  相似文献   

Interaction of 54Mn and 55(59)Fe with EDTA in seawater and 0.55 M NaCl solutions     

Ljerka Musani-Marazović  Zvonimir Pučar 《Marine Chemistry》1977,5(3):229-242

Interaction of ⁵⁴Mn and ⁵⁵⁽⁵⁹⁾Fe with EDTA in seawater and NaCl solutions was investigated by high-voltage paper electrophoresis. These two radionuclides were chosen because they represent two modes of behaviour of radionuclides in seawater—EDTA systems. In seawater without EDTA or at low EDTA concentrations in the systems ⁵⁴Mn behaves as a cation while ⁵⁵⁽⁵⁹⁾Fe gives a zone at the starting point of the electrophoretic strip. At higher EDTA concentrations, both radionuclides give only one anionic zone showing complexing with EDTA. In the intermediate range of the EDTA concentration (“transition region”) ⁵⁴Mn shows continuous change of the electrophoretic mobility from cationic to anionic (fast rate of interaction with EDTA), while ⁵⁵⁽⁵⁹⁾Fe reacts very slowly giving two well-separated zones in the transition region of the EDTA concentration.EDTA concentrations were varied from 10^?6 to 10^?2M, pH being adjusted to 8.0. The behaviour of radionuclides was followed by measuring the electrophoretic mobilities of radionuclides in dependence on the EDTA concentration at different aging times from 0 to 7 days.From the experimental data effective stability constants and the number of EDTA-ligands of ⁵⁴MnEDTA and ⁵⁵⁽⁵⁹⁾FeEDTA complexes in seawater and 0.55 M NaCl solutions were calculated.  相似文献   

Identification of Porphyra lines using computerized DNA fingerprinting   总被引：3，自引：0，他引：3  

Wang Bin  Jia Jianhang  Shi Jinfeng  Chen Yihu  Jin Demin  Xu Pu  Mei Junxue  Weng Manli 《海洋学报(英文版)》2001,20(3):401-407

ImpIONPorghyra is one of the most important rnarine a1gae with glObal distribution and importanterenomic value. AIthOtJgh the yield of POrPhpo is lower than that of kelp, the output valueof Porghpp occupies the first place in rnarine algae in China. The traditional taxonomy ishanly had on the morpbolOgical characteristics, such as the morpbobeical traits size, rnar-gin celIs and the number of repnductive cells. However, most of morPhobeical traits are af:fected by environrnntal factOrs …  相似文献