淮河入海水道淮安地涵枢纽河道水流数值计算

利用平面二维水流数学模型,对淮河入海水道淮安地涵构纽下游河道连接段水流进行了计算研究,计算结果表明,设计方案存在下可道流态复杂及高流速区范围较大等问题,为此比较了三个修改方案,在综合比较水流流态及工程投资的基础上,确定了地涵下游河道连接段推荐方案。推荐方案对于改善下游河道出口至清安河之间的高流速区仍无法有效地改善,需对该区域采取保护措施。     

结构力学分析方法在南海水平井钻进预测中的应用

本文探讨了结构力学分析方法-非线性有限元性在预测水平井钻进中的工程应用,在钻探水平井尤其是大位移水平井中,事先较准确地预测出钻柱的钻进扭矩及钻头前进的方向,是取得水平井成功的关键条件之一。利用非线性有限元理论,着重分析了水平井实际钻进中的钻柱大变形非线性及钻柱与井壁的接触非线性问题,并导出了一套非线性有限元钻柱力学模式,在此基础上编制了一套非线性力学计算程序软件,并在海洋石油南海西部石油公司一个钻井平台水平井钻井进行了五口井的实际验证,获得了一些有启迪性的结论。     

高效液相色谱法测定水发海参中掺甲醛

建立了水发海参中甲醛的衍生高效液相色谱法,方法检出率限为0．05mg/L^-1,回收率大于90．1％,相对标准偏差5．3％,用于实际样品测定,结果满意。     

延长光照时间和海水驯养钝顶螺旋藻的研究

将淡水湖中生长的钝顶螺旋藻驯养在海水中生长 ,并延长光照提高藻类的收得率 ,从而为开发利用这一资源提供有关的实验依据     

Variational assimilation in combination with a regularization method for sea level pressure retrieval from QuikSCAT scatterometer data II: simulation experiment and actual case study

The sea level pressure field can be computed from sea surface winds retrieved from satellite microwave scatterometer measurements, based on variational assimilation in combination with a regularization method given in part I of this paper. First, the validity of the new method is proved with a simulation experiment. Then, a new processing procedure for the sea level pressure retrieval is built by combining the geostrophic wind, which is computed from the scatterometer 10-meter wind using the University of Washington planetary boundary layer model using this method. Finally, the feasibility of the method is proved using an actual case study.     

西班牙拉斯厄米塔斯生物礁的成因研究

拉斯厄米塔斯礁是早寒武世的藻类和古杯生物礁，被认为是属于堤礁类型。本文根据实地观察分析，认为这个礁发育在被剥蚀的侵入岩之上，是一个形成于当时海底隆起上的点礁，虽然其部位恰好在台地与盆地的分界线附近，却与一般含义的堤礁不同。其成因与湖南晚二叠世的华塘礁与梅田礁很相似。图３，参５。     

Electromagnetic Scattering from One-Dimensional Time-Varying Sea Surface with Gaussian-Like Beam Incidence

A widely used iterative technique named the Method of Ordered Multiple Interactions is given for calculat-ing the Gaussian-like beam scattering from a time-varying sea surface with the Pierson-Moskowitz (P-M) spectrum. Thisis done by solving the magnetic field integral equation for the current induced on an infinite rough surface. Following thediscretization of the integral equation, the unknown currents can be determined more rapidly with the LU decomposition.Numerical results are presented with emphasis on the electromagnetic backscattering at low grazing angle incidence. Itis shown that the backscattering cross section is proportional to the nearly fourth power of the grazing angle for thebackscattering cross section with a different beam waist, surface length, and velocity of the wind are discussed     

A variational approach to the derivation of high-order shallow-water equations

Summary It is shown that the Airy, Boussinesq, Su and Gardner and extended Boussinesq equations for the propagation of shallow-water waves can be easily obtained from Luke's variational principle. The technique of derivation of the equations is examined in detail and used to extend the range of application of the highest-order theories to the case of variable depth. The approach is relatively straightforward and, moreover, points out the hypotheses under which the various equations are derived.     

价夸克分布与海夸克分布的核效应

提出了一个由轻子-核深度非弹性散射和核Drell-Yan过程的实验数据得到价夸克分布和海夸克分布的核效应函数RvA(x_t)和RsA(x_t)的方法. 由这两个函数可以检验解释核效应的理论模型. 以铁核为例求出了RvFe(x_t)和Rs(Fe)(x_t).     

Potential Contamination from Glassware in the Determination of Phosphorus in Natural Waters

Abstract

Phosphorus was determined in samples of glass from laboratory glassware, using a hydrofluoric digestion followed by colorimetry. Glass from such sources is shown to contain up to 0.002% of phosphorus. Experiments on storage of samples in glass bottles show that glassware may contribute significant phosphorus contamination to natural water samples, particularly seawater, as a result of partial dissolution of glass into the sample during storage. The release of phosphate from glassware into the sample is greater than the concentration expected from the P/Si ratio in glass and the silicate dissolution in the sample. This is attributed to the formation of a leached layer at the surface of the glass in contact with the water. Under the alkaline digestion conditions applied in this work for the total phosphorus determination, the dissolution of glass does not appear to be a source of measurable phosphate contamination. Nevertheless each analyst must satisfy himself that no phosphate contamination occurs under his particular working conditions with his own glassware.