Application of Line Boundary Technique to 2D Tidal Current Simulation   总被引：1，自引：0，他引：1  

SONG Zhiyao XUE Hongchao YAN Yixin Doctor  Senior Engineer  College of Harbor Waterway  Coastal Engineering  Hohai University 《中国海洋工程》1999,(4)

To deal with the problems concerning the shore boundary,moving boundary and engineeringboundary which are encountered frequently in 2D tidal current simulation by the finite difference method,theconcept of line boundary is introduced and studied here,and then the line boundary technique in common useis proposed in this paper.Analysis of some calculation cases shows that this technique is practical,effective,and simple in 2D tidal current simulation involving different boundaries.  相似文献   

湛江流沙湾马氏珠母贝的养殖容量   总被引：3，自引：0，他引：3  

朱春华  申玉春  谢恩义  叶宁  王彦  杜晓东  吴灶和 《热带海洋学报》2011,(3)

2008年3月—2009年1月调查分析流沙湾浮游动植物的生物量、叶绿素a含量、初级生产力、马氏珠母贝Pinctada martensii含壳重与鲜组织重的比值、养殖贝类和野生滤食性动物的滤水率、潮间带和潮下带底栖贝类及吊养区附着滤食性动物现存量等,应用营养动态模型和贝类养殖容量估算模型估算滤食性动物的总容量,扣除野生滤食性动物现存量,最终确定马氏珠母贝的养殖容量。结果显示,2种模型估算马氏珠母贝的养殖容量分别为19637.5t和20126.4t,平均养殖容量19881.95t。依据流沙湾马氏珠母贝的通常养殖密度(1.05×105个.hm-2)和平均商品规格(41g.个-1)计算,流沙湾马氏珠母贝的适养面积为461.83hm2。  相似文献   

Inheritance Pattern of Microsatellite Loci and Their Use for Kinship Analysis in the Japanese Scallop Patinopecten yessoensis     

XU Kefeng    LI Qi College of Fisheries  Ocean University of China  Qingdao  P. R. China 《中国海洋大学学报(英文版)》2009,8(2)

The inheritance mode of seven microsatellite markers was investigated in Patinopecten yessoensis larvae from four con-trolled crosses,and the feasibility of using these markers for kinship estimation was also examined. All the seven microsatellite loci were compatible with Mendelian inheritance. Neither sex-linked barriers to transmission nor major barriers to fertilization between gametes from the parents were evident. Two of the seven loci showed the presence of null alleles in two families,suggesting the...  相似文献   

Isolation and Characterization of Collagen from Squid(Ommastrephes bartrami) Skin   总被引：1，自引：0，他引：1  

YAN Mingyan  LI Bafang    ZHAO Xue College of Food Science  Engineering  Ocean University of China  Qingdao  P. R. China 《中国海洋大学学报(英文版)》2009,(2)

Collagen of squid(Ommastrephes bartrami) skin was examined in the present study. Histology showed that collagen fiber in the skin was partially cross-linked with muscle fiber. Acid-solubilized collagen(ASC) and pepsin-solubilized collagen(PSC) were extracted from the skin and characterized. The results of amino acid composition and electrophoretic patterns revealed that ASC and PSC were both type Ⅰ collagen,containing α1 and α2 chains. FTIR(fourier transform infrared spectroscopy) investigations confirmed t...  相似文献   

Distribution and characteristics of volcanic reservoirs in China     

HUANG Yulong  WANG Pujun  CHEN Shuming .College of Earth Sciences  Jilin University  Changchun  China.Daqing Oilfield Corporation  PetroChina  Daqing  Heilongjiang  China 《东北亚地学研究》2009,12(2):64-79

About forty productive oil/gas fields hosted in volcanic reservoirs have been found since 1957 in fourteen basins of China. They can be simply subdivided into two groups, the east and the west. Reservoir volcanic rocks of the east group are predominantly composed of Late Jurassic to Early Cretaceous rhyolite and Tertiary basalt, preferred being considered as rift type volcanics developed in the circum-Pacific tectonic regime. Those of the west are Permo-Carboniferous intermediate/basic volcanic rocks, being island-arc type ones developed in paleo-Asian Ocean tectonic regime.  相似文献   

Study on drilling mechanism and optimization of percussion-extruding DTH hammer bit     

LUO Chunhong  ZHENG Zhichuan  CAO Pinlu College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2009,12(1):36-39

The authors tested the percussion-extruding Down-the-hole （DTH）hammer bit with five different structures and mainly analyzed the drilling mechanism between conical bit and stepped bit. In addition, aiming at ＂the pile effect＂ in combination with the advantage＇ of stepped bit, we design a new cam spinning bit and test it outdoors. The result shows that using cam spinning bit can solve the problem of ＂the pile effect＂, which can also obtain higher drilling efficiency than using conical bit in high confining pressure strata. It is characterized by novel structure and high drilling speed as well as good guiding, and it is significant for improving efficiency in percussion-extruding drilling technique.  相似文献   

Causes of rockfalls in Al-Huwayshah area,Yemen     

Aref M.O.AL-JABALI  Abdo S.AL-MAQTARY  Hussein AL-AKHALI  Mohammed HAZAEA  Fadel AL-AGHBARI 《东北亚地学研究》2009,(1)

According to topography of Yemen,most areas and villages are located at obligated crest,toe of mountain and under cliffs.Therefore Al-Huwayshah consisting of Tawilah sandstone group is characterized by steep slope reach to 90° in some areas.This area is affected by strong tectonic movements and faults that occurred during the geological epochs.This effect enhances to find out fractures and joints as well as the rocks become brittle and ready to slide depending on the position of area.And there are some frac...  相似文献   

Elastic-plastic analysis for pile-anchor supporting system of deep foundation pit     

JIN Yingyu  BAI Yu College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2009,(4):236-240

By using numerical analysis methods to simulate the deep excavation, a lot of analyses are established on the basis of two-dimensional plane strain, ignoring the fact that foundation pit possesses three dimensions. For soil constitutive relation, people always take linear and nonlinear model, without considering the plastic behavior of soil. Using plastic-elastic hardening model to simulate constitutive relation of soil characteristics, the authors carried out mechanical analysis for pit excavation and support. The results show that the analysis for the stress state of pile anchor system is an effective way which provides theoretical basis for calculation of soil displacement.  相似文献   

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郑作亚  党亚民  卢秀山  郭金运  阳凡林 《大地测量与地球动力学》2009,29(5):107-111

??GPS??????λ?????????У?????????????????估???????λ??????????????????????????????????????????λ????????????λ?????????????????????????????????????????????????????????伸?ι?????????????????????????????Щ???????????????????????????????????????????????????????  相似文献   

Predicting size effect on diffusion-limited current density of oxygen reduction by copper wire     

芦永红  徐海波  王佳  钟莲 《中国海洋湖沼学报》2011,29(1)

The size effect of copper wire radius (0.04–0.82 mm) on the diffusion-limited current density of an oxygen reduction reaction in stagnant simulated seawater (naturally aerated 0.5 mol/L NaCl) is investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) and compared with the results obtained in 0.5 mol/L H2SO4. In the oxygen diffusion-limited range, size effect is found to occur independent of electrolytes, which is attributed to non-linear diffusion. Additionally, to sati...  相似文献