鄱阳湖的风情及风浪特性

本文分析了鄱阳湖的风在时空上的分布变化，在区域上的变化，湖陆风的基本特征，风与浪的关系。风的危害。由于其地处中纬度，季风明显，是江西省境内大风集中区域，有丰富的风能资源。每年６－８月为南风或偏南风，其他月平均为北风或偏北风。鄱阳湖实测到最大浪高２米，４５°斜坡上波浪最大爬高４．８１米。     

正交设计和方差分析应用于悬浮物和沉积物的EDAX分析条件试验

本文用正交试验和方差分析对悬浮物和沉积物粉末样品的EDAX分析进行了条件试验和数据处理,找出影响试验结果的主要因素和最佳分析条件,提高了分析结果的准确性。     

白酒中几种含氮杂环化合物

实验确定了分析白酒中含氮杂环化合物的最佳条件：含氮杂环化合物在ｐＨ１～２的条件下成盐，酒样浓缩１０倍后以乙醚萃取除去中性杂质和酸性杂质，将样品ｐＨ再调至９，用乙醚萃取后ＫＤ浓缩，取样品进行气相色谱分析。以上述条件测定了茅台酒等６种名酒中的含氮化合物，发现各种酒中均有含氮杂环化合物存在，但因酒型的差别，化合物含量和组成模式相差较大。     

On the coupling of uncoupled flow and transport solvers

The coupling of flow and transport solvers we are dealing with in this paper represents a whole intermediate processing step taking place between the two. We develop new techniques to ensure mass conservation of the transport while using totally different numerical schemes in the flow and in the transport solvers. We also present a method which allows the use of larger time steps for the transport computation than the one used for the flow leading therefore to faster computations and considerable reduction in disk space for the storage of flow data. These techniques are applied and tested in the numerical application of 2D and 3D problems.     

模糊类比分析法在渔业数值预报中的应用研究

渔业数值预报除涉及水文、气象、饵料生物量、资源幼体等的资源环境因子外 ,还要考虑经济、社会等因素。本文在分析 1987～ 1993年历史资料的基础上 ,利用资料之间的类比性 ,提出渔情预报的模糊类比分析方法 ,将预报年份与历史记录之间的多指标综合类比排序 ,得出预报值。在东海北部鲐渔情预报中发现 ,与直接估算法比较 ,该方法具有所需资料少、预报迅速合理的优点 ,而且随着历史资料的扩充 ,自身能够不断学习更新。     

黄、渤海与山东半岛地方性降水天气

分析了山东半岛几种地方性降水天气的基本特征及其成因，阐明黄、渤海是山东半岛地方性降水天气的主要影响因素。其作用主要体现在热力和水汽两个方面，以及由热力条件所引发的中小尺度辐合系统。     

脂溶性壳多糖的制备

提出通过甲烷磺酸／酰氯体系低温均相制备乙酰化甲壳质（ＡＣＣ）、己酰化甲壳质（ＨＣＣ）、十二酰化甲壳质（ＤＣＣ）及已酰化Ｎ－苄基甲壳胺（ＮＢＣ），从而获得脂溶性Ｎ－苄基己酰甲壳胺（ＮＢＨＣ）的反应条件，并对各酰化产物在不同溶剂中的溶解性能进行试验。指出：产物ＡＣＣ溶于甲酸中；ＨＣＣ、ＤＣＣ溶于甲酸及乙醇中；ＮＢＨＣ溶于甲酸、乙醇、乙醚、苯及乙酸乙酯中。     

Precipitation of authigenic uranium in suboxic continental margin sediments from the Okinawa Trough

Concentrations of U and Th isotopes in Okinawa Trough and East China Sea sediment cores were determined by isotope dilution inductively coupled plasma-mass spectrometry (ID-ICP-MS) to investigate the behavior of redox sensitive uranium in suboxic hemipelagic sediments and determine their significance in oceanic uranium balance. ²³⁸U concentrations and ²³⁸U/²³²Th activity ratios in the East China Sea sediments showed no remarkable variation with depth. However, ²³⁸U and ²³⁸U/²³²Th ratios in the Okinawa Trough sediments were low in the surface oxidizing layer but increased where the suboxic condition was encountered. The distribution profiles of ²³⁰Th and ²³²Th concentrations were relatively constant with depth in both the Okinawa Trough and East China Sea sediment cores. These results suggested that there has been post-depositional precipitation of authigenic uranium within the suboxic Okinawa Trough sediment column. The post-depositional precipitation rates of authigenic uranium were estimated to be 47 ± 5 to >62 ± 8 ng cm⁻² yr⁻¹; these rates were comparable to those previously reported for several anoxic sediments. A mechanism controlling precipitation of uranium may be the downward diffusion of uranium U(VI), reduction to U(IV) and finally precipitation onto the solid phase. The accumulation rate of uranium for the Okinawa Trough sediments was approximately eight times higher than the world average rate reported for suboxic sediments. This removal of uranium in the oceanic budget increases the importance of the suboxic sediment sink.     

内蒙古克鲁伦凹陷伊敏组下段砂岩铀成矿条件、特征及成因

为查明内蒙古克鲁伦凹陷伊敏组下段砂岩铀成矿规律和成因,系统总结了内外部铀源、构造环境、岩性-岩相特征、后生氧化作用等关键控矿条件以及铀成矿特征,较精准厘定了目的层时代及其铀成矿年龄,进而构建了砂岩铀成矿模式。结果表明:克鲁伦凹陷的主攻找矿目的层为伊敏组下段,侏罗纪中酸性火山岩、海西期花岗岩、下白垩统伊敏组和地下水的U含量高,指示了内外部铀源十分丰富;目的层形成于断-坳转换期,发育扇三角洲相—滨浅湖相沉积体系,(水下)分流河道微相灰色砂体发育,岩性以含砾粗砂岩、砂砾岩为主,结构疏松,透水性好;原生砂体中富含碳屑及植物茎干,自身还原容量较高,是一套良好的含矿建造;该砂体普遍发育强烈的褐黄色面状古潜水(局部古潜水-层间)后生氧化作用,进而控制了矿体的形成和形态;矿体埋深一般小于150 m,每平方米U质量为0.46~1.00 kg,主要呈透镜状和似层状;铀矿化砂岩全岩U-Pb定年获得了(67.1±5.9)Ma和(63.7±5.2)Ma的等时线成矿年龄;结合凹陷构造演化史,建立了伊敏组下段4个阶段的古潜水-层间氧化铀成矿模式,即早白垩世早期成矿前富铀建造准备阶段、早白垩世中晚期含矿目的层形成阶段、古近纪主成矿阶段和新近纪成矿停滞保存阶段,并指出区内深部(500 m以浅)仍具有较好的古潜水-层间氧化带型铀矿成矿潜力。     

Proof of the equivalence of Tanizawa–Berkvens’ and Cointe–van Daalen's formulations for the time derivative of the velocity potential for non-linear potential flow solvers

Dealing with freely-floating bodies in the framework of non-linear potential flow theory may require solving Laplace's equation for the time derivative of the velocity potential. At present, there are two competing formulations for the body boundary condition. The first one was derived by Cointe [1] in 2D. It was later extended to 3D by van Daalen [2]. The second formulation was derived by Tanizawa [3] in 2D. It was extended to 3D by Berkvens [4]. In this paper, a proof is given that the Cointe–van Daalen's and the Tanizawa–Berkvens’ formulations are equivalent. It leads to a simplified version of Cointe–van Daalen's formulation. The formulation is validated against the analytical solution for a moving sphere in an unbounded water domain.