An Approach to Stability Analysis of Embedded Large-Diameter Cylinder Quay

The large-diameter cylinder structure, which is made of large successive bottomless cylinders placed on foundation bed or partly driven into soil, is a recently developed retaining structure in China. It can be used in port, coastal and off-shore works. The method for stability analysis of the large-diameter cylinder structure, especially for stability analysis of the embedded large-diameter cylinder structure, is an important issue. In this paper, an idea is presented that is, em-bedded large-diameter cylinder quays can be divided into two types, i.e. the gravity wall type and the cylinder pile wall type. A method for stability analysis of the large-diameter cylinder quay of the cylinder pile wall type is developed and a method for stability analysis of the large-diameter cylinder quay of the gravity wall type is also proposed. The effect of sig-nificant parameters on the stability of the large-diameter cylinder quay of the cylinder pile wall type is investigated through numerical calculation.     

Spatial variability in petrophysical properties in Upper Maastrichtian chalk outcrops at Stevns Klint, Denmark

The spatial variability of porosity and permeability was determined for a section in the uppermost Maastrichtian chalk exposed in the Sigerslev quarry at Stevns Klint. The aims were threefold: (1) to quantify the spatial variability pattern and its link to geology by applying systematic variogram analysis procedure, (2) to detect potential cyclicity in the petrophysical properties in this pure and overtly homogeneous chalk, and (3) to compare the section with chalk reservoirs in the North Sea in order to asses to what extent this onshore sequence has a potential as an analogue of the offshore, more deeply buried chalk reservoirs. The interval is of comparable stratigraphic age to the uppermost reservoir zones in the Tor Formation of the North Sea chalk reservoirs. The variability and spatial correlation of porosity and permeability in both horizontal and vertical directions are interpreted in a geological context and show indications of small-scale heterogeneity at 15–25 cm scale, but the clear cyclic layering described from other chalk deposits is not recognised at this locality. The investigated outcrop is not a close analogue to North Sea reservoir chalk, but some aspects are common including basic material properties, porosity/permeability trends and the variability pattern. The outcrop has a potential as analogue for some of the onshore subsurface chalk successions at shallow burial depth that form important aquifers.     

关于具二次约束最小二乘问题的敏度分析

本文系统地研究具二次约束最小二乘问题的敏度分析。首先给出长期方程唯一正根的上界和下界；然后证明割线法用于计算拉格朗日乘子时全局收敛；最后给出解的扰动界。     

极谱法在镉诱导单胞藻和禾草类植物螯合物研究的应用

三角褐指藻（Phaeodactylum tricornutum）和翦股颖草属禾草（A-grostis capillaris）经过处理后再用液相层析法从中提取一种金属结合多肽，极谱分析表明不同的镉结合多肽具有不同的稳定性，金属结合与金属硫蛋白不同，在电位--1.7V附近未出现氧催化峰，金属硫蛋白以及从单胞藻和禾草中提取的多肽在极谱测定过程中都在电位-520mV和-930mV附近出现双峰，在-520mV处，半波电位显示了单个镉硫醇键的还原，在-930mV处的峰是由于镉和硫多齿螯合的还原，因此这通常可用以鉴定镉螯合物。在镉浓度为5umol/dm^3和10umol/dm^3时-930mV的峰高与镉浓度之间存在着对应关系。     

Numerical Analysis of Wave Forces on Arbitrarily Shaped Multi-Pillars Over Varying Topography

The modified hybrid element method (MHEM) is utilized to predict and analyze wave forces on arbitrarily shaped multiple bodies. This method can be applied to waves of all water depths, i. e. shallow, intermediate, and deep waters, on slowly varying seabed. The MHEM employs the ICCG method to save CPU and storage, thus the computation of wave forces for large multi-body systems can be carried out on microcomputers. Numerical results of the present method are compared with experimental data and other solutions. It is shown that the MHEM provides more accurate solutions of the wave forces than other numerical methods do. Therefore, the methodology presented herein can be used in the design of coastal and ocean structures.     

珠江口外陆架表层沉积物的地球化学分区

根据249个表层沉积物样品的Ca,Al,N,P,Mg,Fe,Mn,Ti和有机碳的测定数据,利用稳健RQ型主分量分析及Q型聚类分析方法,对珠江口外陆架表层沉积物进行了地球化学分类,并将该陆架区划分成陆源细碎屑沉积区、经叠加改造的残留泥砂质沉积区、生物碎屑沉积区以及高能环境下的石英砂质沉积区。结果表明了稳健统计方法相对于传统统计方法的优越性,以及采用稳健主分量的Q载荷进行聚类分析相对于用原始变量进行聚类分析的优越性。     

青海湖全新世植被演变及气候变迁：QH85—14C孔孢粉数值分析

本文应用青海湖QH85-14C孔取得的具有~(14)C测年数据所支持的原始孢粉资料,进行数值分析(有序聚类、主成份分析、滑动平均和回归分析)。从而对青海湖区11000年以来的植被和气候变化进一步讨论。     

中国对虾(Penaeus chinensis)消化系统发生的研究

本文对中国对虾消化道和中肠腺的发生进行了研究。完整的中肠管形成于Ｎ３期，它是由幼虫腹面的内胚层板向背中线上卷合拢而形成。在Ｚ１期消化道完全贯通。至Ｍ１期，胃分化为贲门胃和幽门胃两部分，中肠前盲囊和中肠后盲囊也在此期出现，同时胃磨的雏形发生，但完整的胃磨形成于Ｐ期。另外，中肠腺始于Ｎ４－５期中肠前端突出的两对中肠腺盲囊。第一对中肠腺盲囊于Ｍ３期退化消失，而第二对中肠腺盲囊则发育为成体的中肠腺。中肠腺小管由４种不同类型的细胞（胚性细胞、吸收细胞、纤维细胞和泡状细胞）所组成     

分潮波模型多资料数值计算方法研究 Ⅱ.有限差分最小二乘方法

对含多资料的分潮波模型的超定问题进行探讨，建立一种有限差分—最小二乘方法，该方法使得岸边资料直接进入了计算方程，并保证岸界法向流速为零条件。通过对渤海的四大分潮的试算，证实本方法可行。