区域地球化学特征及其主控因素——对内蒙古珠斯楞地区找矿的意义

在1∶5万水系沉积物测量的基础上,对内蒙古额济纳旗珠斯愣地区的地球化学特征及其主控因素进行初步分析,并对元素分布特征、元素相关性分析、单元素异常与构造之间关系、综合异常与构造之间关系进行了探讨。研究发现,Cu、Au、Sb为区内具一定潜力的找矿元素,与呼伦西白-珠斯楞海尔罕反"S"形构造带南端内、外旋面的转换的珠斯楞海尔罕一带形成一个与断裂构造吻合度较高的、半环性的成矿成晕中心。因而推断,区内具有形成与中酸性侵入岩有关的热液铜多金属矿的可能,其中珠斯楞海尔罕铜金矿和道布青乌苏南北金锑矿2个找矿靶区严格受呼伦西白-珠斯楞海尔罕反"S"形构造的控制。     

S-101与S-57分类编码对比分析(二):属性

地理要素的分类编码是人类认知地理信息世界的成果,也是人类对地理信息世界再认知的入口和关键。在海洋地理信息领域,S-101数据标准即将替代现行S-57 ENC标准,分类编码方案也将会相应改变。先对S-57到S-101的属性变化内容进行整体描述,再从地理要素属性、元要素属性、图示表达属性三方面内容,对新旧两套分类编码中的属性内容进行对比分析,为涉海人员消化吸收新标准提供一定的参考。     

基于波形重定技术的杭州湾平均海面高模型建立

利用AVISO提供的SARAL卫星杭州湾周年的WAVEFORM数据,通过对卫星波形分析,提出了一种新的波形重定方法,该方法在顾及波形物理机制基础上,根据各波形的特征进行重定。对重定前后的波形数据进行粗差剔除、共线平均,分析了重定后数据质量。通过交叉点平差,结合验潮站数据建立杭州湾平均海面高模型,所建模型与验潮站平均海面高差值的平均值为0.006m,标准差为0.038m。结果表明,利用本文提出的方法能显著提高卫星测高数据的精度与质量。     

基于窗口移动中误差模型探测船载重力数据粗差

粗差探测是评价船载重力测量数据成果质量的重要内容。卫星测高反演重力场技术提供了海域全覆盖的重力场数值模型,其精度水平已满足探测船载重力测量数据粗差的精度要求。以卫星测高反演重力场模型为基础,提出了基于窗口移动中误差模型探测船载重力测量粗差的数据处理方法,其基本思路是:以卫星测高反演重力场数值模型作为背景场,计算船载重力测点处的测高重力值的差值,以差值作为输入量,等权构建中误差背景场,以开窗中误差背景场作为参考,按照平差思想探测船载重力测量数据的粗差。实验结果表明,依据本文方法能有效探测船载重力测量数据的粗差。     

An Analytical Solution for Dynamic Response of the Plate with Different Impedances Subjected to Underwater Explosion

In this paper, the transmitted part of the incident wave is considered to revise Taylor’s solution, which is used to extend its application for analytical models to predict the response of the plate with different material properties. The influence of the material properties and the boundary condition of the plate on fluid and structural dynamics is systematically investigated. The analytical results are compared with those of detailed dynamic FE simulations and the two are in good agreement. The results indicate that the analytical method is valid and suitable for the plates with different material properties subjected to underwater explosion. It is found that Taylor’s results of the plate with small impedance are invalid, which indicates a potential application field for the analytical method.     

Typical Equilibrium Beach Profile Models and Their Significances from Different Segments of A Headland-Bay Beach

This study introduces three typical models on equilibrium beach profile, and discusses the application limitations of these models. Then this study examines the selections for applying these models on different coastal segments of a headland-bay beach in west Guangdong, South China, and explores the physical significances of those parameters in the models. The results indicate that: (1) Bodge’s model is more in line with the equilibrium beach profile of the tangential or transitional segment, whereas Lee’s model is more consistent with the shadow profile; (2) most of the parameters in three models have clear physical significances in accordance with the actual characteristics of this headland-bay beach; and (3) both the selections for the equilibrium beach profile from different segments and significances of most of the parameters in three models are in essence correlated with the morphodynamic states at various coastal locations.     

Development of A Depth-Integrated Longshore Current Model with Unstructured Grids

A depth-integrated model for simulating wave-induced longshore current was developed with unstructured grids. Effects of surface roller and horizontal mixing under combined waves and currents were incorporated in the numerical model. Recommended values of model coefficients were also proposed based on sensitivity analysis. Field observations and three series of laboratory measurements including two cases conducted on the plane beach and one implemented on the ideal inlet were employed to examine the predictive capability of this model. For the field case and laboratory cases conducted on the plane beach, numerical results were compared favorably with the measured data. For the case with an ideal inlet, simulated circulation pattern is supposed to be reasonable although some deviations between numerical results and measured data still can be detected.     

Application of Linear Mean-Square Estimation in Ocean Engineering

The attempt to obtain long-term observed data around some sea areas we concern is usually very hard or even impossible in practical offshore and ocean engineering situations. In this paper, by means of linear mean-square estimation method, a new way to extend short-term data to long-term ones is developed. The long-term data about concerning sea areas can be constructed via a series of long-term data obtained from neighbor oceanographic stations, through relevance analysis of different data series. It is effective to cover the insufficiency of time series prediction method’s overdependence upon the length of data series, as well as the limitation of variable numbers adopted in multiple linear regression model. The storm surge data collected from three oceanographic stations located in Shandong Peninsula are taken as examples to analyze the number-selection effect of reference oceanographic stations (adjacent to the concerning sea area) and the correlation coefficients between sea sites which are selected for reference and for engineering projects construction respectively. By comparing the N-year return-period values which are calculated from observed raw data and processed data which are extended from finite data series by means of the linear mean-square estimation method, one can draw a conclusion that this method can give considerably good estimation in practical ocean engineering, in spite of different extreme value distributions about raw and processed data.     

Ultimate Bending Capacity of Strain Hardening Steel Pipes

Based on Hencky’s total strain theory of plasticity, ultimate bending capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material, the simplified analytical solution is proposed as well. Good agreement is observed when ultimate bending capacities obtained from analytical solutions are compared with experimental results from full-size tests of steel pipes. Parametric study conducted as part of this paper indicates that the strain hardening effect has significant influence on the ultimate bending capacity of steel pipes. It is shown that pipe considering strain hardening yields higher bending capacity than that of pipe assumed as elastic-perfectly plastic material. Thus, the ignorance of strain hardening effect, as commonly assumed in current codes, may underestimate the ultimate bending capacity of steel pipes. The solutions proposed in this paper are applicable in the design of offshore/onshore steel pipes, supports of offshore platforms and other tubular structural steel members.     

海洋Pseudomonasaeruginosasp.DES-3的鉴定以及基因ap02对其产蛋白酶的影响研究

海洋是地球上最大的生态系统,其多样独特的生态环境造就了其有别于其他环境的微生物资源。本研究利用蛋白酶的活性筛选策略,从辽宁省营口市某海洋淤泥中分离得到一株产蛋白酶的优势菌株DES-3。通过微生物形态学特征、生理生化性质和16SrDNA基因鉴定以及系统发育进化关系的分析,将该菌株鉴定为铜绿假单胞菌属,命名为Pseudomonas aeruginosa sp.DES-3。其胞外蛋白酶的最适反应温度和最适pH分别为55℃和9.0。将来自于碱性污染土壤宏基因组文库的编码碱性蛋白酶基因ap02与广宿主表达载体pBBR1MCS-5连接,转化至野生型菌株P.aeruginosasp.DES-3细胞中,成功构建了基因工程菌株P.aeruginosasp.DES-3/pBBR1MCS-5-ap02。基因工程菌株的最适反应温度为60℃,较野生型菌株提高了5℃。本研究构建基因工程菌株的策略可为菌株的改造和相应工业应用提供一定的技术参考。