高速摄影对散体振动的研究

以现代高速摄影技术和图像分析以及数据处理方法，针对高效振动磨机中弹性散体工质（如钢棒、球体等）的振动力学进行了深入的探讨和分析，为研究散体动力学和振动超细粉碎过程中的能量分布和传递规律以及能量与物质的相互转换机理奠定了基础，也为相关学科的发展提供了一种可以借鉴的方法。     

DGPS RTK技术在无验潮水下地形测量中的应用初探

本文简要介绍了DGPS RTK技术的基本原理和作业流程，阐明了该技术在无验潮水下地形测量中的适用性，并以除六泾水文大断面的测量为例介绍了利用该技术进行工程实测的过程，通过对实测数据成果的分析，得出一些有益的结论。     

热带地区流场异常与江淮特大暴雨成因的研究

本文通过计算和对比分析，得到１９９１年春、夏江淮地区特大暴雨形成的五个基本特征：西北太平洋上副高显著偏西、偏北；较弱的西南季风与东南气流汇合成强西南气流伸向江淮地区；偏东风与强西南风形成的辐合带在江淮地区维持；江淮地区对流层中下部为强上升运动、上部为辐散；１３０°Ｅ附近南半球向北半球的较强越赤道气流持续。     

Refraction-Diffraction Mathematical Model for Waves With Lateral Energy Transmission Mechanism and Its Verification

To solve problems concerning wave elements and wave propagation, an effective way is the wave energy balance equation, which is widely applied in oceanography and ocean dynamics for its simple computation. The present papaer advances wave energy balance equations considering lateral energy transmission and energy loss as the governing equation for the study of wave refraction-diffraction. For the mathematical model, numerical simulation is made by means of difference method, and the result is verified with two examples.     

The description of a new kind and three new types of medusae nematocysts in the Xiamen Harbour, China

A new kind of nematocyst, heteromorphore, and three new types of nematocysts, microbasic spino-mastigophore, microbasic undulata-mastigophore, microbasic laevis-mastigophore, are described from medusae of the Xiamen Harbour and discussed by comparison with the results of other research workers.     

The intertidal erosion rate of cohesive sediment: a case study from Long Island Sound

Over the past decades, many attempts have been made to generate useful bottom erosion models for the study of cohesive sediment movement. This study addresses some of the key questions involved in determining the functional relationship between erosion rate and bottom shear stress. Current, wave, and turbidity data were collected from a bottom mounted instrument array in a moderately energetic estuarine environment. The bottom shear stress was calculated from a wave–current interaction model. The erosion rate was derived from the observed sediment concentration using a vertical mixing model. Examination of the relationship between erosion rate and bottom stress showed that the erosion rate varied at intertidal frequency. When averaged over the tidal fluctuation, the erosion rate remained approximately constant at low stress, but increased sharply when the shear stress rose above a critical value. This suggests two-stage erosion. The bed has a layered structure, in which a thin layer of loose, high water content material overlies a more consolidated bed. The top layer of high water content material (fluff) was easily disturbed and re-suspended by tidal currents, but the consolidated bottom layer was eroded only under conditions of high shear stress.     

The irregular wave force on pier group

In this paper, the irregular wave force on a cylindrical pier group is calculated by the method of spectrum analysis, and the coefficients of the group effect of piers in the pier group are given here. The calculated results, using P-M and Bretshneider's. (B's) spectra, are obtained for the cases of 2 piers, 3 piers and 4 piers. To compare these results with those obtained for regular waves, we can come to some significant conclusions. Under the action of the irregular wave, when the distance between the piers in the pier group increases, the coefficient of the group effect decreases and tends rapidly to the case of a single pier. In general, when the ratio of the distance between the piers to the diameter of the pier is greater than 4, the group effect can be neglected.     

黄海区水母类的生态研究

本文根据１９８２年４月２１日～５月１２日，７月２３日～８月５日，１０月１２～３０日在３４°３０′Ｎ以北．１２４°Ｅ以西黄海水域污染现状综合调查中获得的样品和资料，分析了本海区水母类的种类组成，数量分布以及季节变化。调查海区共鉴定有３４种水母，其中优势种有盘形美螅水母Ｃｌｙｔｉａｄｉｓｃｏｉｄａ，四枝管水母Ｐｒｏｂｏｓｃｉｄａｃｔｙｌａｆｌａｖｉｃｉｒｒａｔａ，五角水母Ｍｕｇｇｉａｅａａｔｔａｎｔｉｃａ。秋季（１０月）为水母类总个体数的高峰期（８．６７个／ｍ３）。水母类的分布与水温、盐度密切相关，海流或水团也起重要作用．水母类分布的变更可以反映出沿岸水和外海水相互推移和消长状况。     

海带几个不同种的雌性克隆对高温的适应力

每几个不同种的雌性克隆对高温(22℃、24℃、26℃)的适应力有所差异。大西洋沿岸的Laminariahyperhoren和L.sacchrina雌性克隆较太平洋沿岸的L.japonica、L.angustata和L.ochotensis雌性克隆明显地不耐高温,遗传性的不同是造成这种差异的主要原因。这种遗传性差异是海带长期自然选择的结果。同一物种L.japonica和L.japonicaCⅡ两种雌性克隆在24℃条件下,在第24天其死亡率分别是40.2％和25.2％,X~2=12.25,P<0.001,差异是高度显著的,说明这种不同是遗传性不同所致,而且属于物种内部的差异。     

Analysis of seabed instability using element free Galerkin method

Wave-induced seabed instability, either momentary liquefaction or shear failure, is an important topic in ocean and coastal engineering. Many factors, such as seabed properties and wave parameters, affect the seabed instability. A non-dimensional parameter is proposed in this paper to evaluate the occurrence of momentary liquefaction. This parameter includes the properties of the soil and the wave. The determination of the wave-induced liquefaction depth is also suggested based on this non-dimensional parameter. As an example, a two-dimensional seabed with finite thickness is numerically treated with the EFGM meshless method developed early for wave-induced seabed responses. Parametric study is carried out to investigate the effect of wavelength, compressibility of pore fluid, permeability and stiffness of porous media, and variable stiffness with depth on the seabed response with three criteria for liquefaction. It is found that this non-dimensional parameter is a good index for identifying the momentary liquefaction qualitatively, and the criterion of liquefaction with seepage force can be used to predict the deepest liquefaction depth.