马尾松树轮不同组分稳定碳同位素的差异及其对气候变化响应的初步研究

比较了中国东南地区九岭山和九连山两地马尾松（Pinus massoniana）树轮不同组分δ¹³C对气候变化响应的敏感性,结果表明：α纤维素δ¹³C和综纤维素δ¹³C在均数方面较全木δ¹³C分别偏正1.170‰±0.168‰和1.211‰±0.121‰;3种组分δ¹³C年际变化序列显著正相关（p < 0.001）;两地生长季中晚期水分状况是制约马尾松树轮δ¹³C的主要因子,3种组分δ¹³C与此时段的气候要素相关性均达到显著水平（p<0.05）,3种组分δ¹³C对气候变化响应的敏感性没有显著差异。     

GIS支持下土地生态环境敏感性评价——以金坛市为例

针对传统的生态环境敏感性评价指标体系差异较大,尚未形成统一体系,并且各个指标之间的关系及相互影响的情况并没有得到体现的问题,该文在地理信息系统的支持下,选取土地质量尺度的土地利用类型、土壤质地,及生态尺度的水环境、植被覆盖度、人口密度、坡度作为生态环境敏感性因子,同时建立了以水环境为主要因子的土地生态敏感性指数模型,对金坛市生态环境敏感性进行单因子评价和多因子综合评价。评价结果显示,金坛市生态高敏感区和中敏感区占到全市总面积的78%,低敏感区和不敏感区占到全市总面积的22%。针对不同土地生态敏感性分区因地制宜提出用地策略,为土地利用总体规划和城市生态保护提供参考。     

切向流速探头简介

切向流速探测器是海洋湍流探测中基本的和必要的工具。该探测器可用压电陶瓷双金属片作其传感器。本文介绍了一种目前国际上常用的切向流速探头的结构、制作方法、工作原理、测定其灵敏度的装置、步骤以及在用回归法拟合实验曲线求灵敏度时所用的回归方程。文中还证明了多年来一些海洋学家所采用的拟合函数并非是最佳的。     

真鲷视网膜结构及视觉特性研究──Ⅲ．真鲷视觉特性

视网膜电图（ＥＲＧ）结果显示，真鲷Ｐａｇｒｏｓｏｍｕｓｍａｊｏｒ视网膜具混合型特征。强光明适应后，ｂ波阈值在８０ｍｉｎ回复至暗视水平。明适应过程中，ｂ波振幅存在Ｄ型和Ｒ型。其光谱敏感曲线在强背景光下（ｌｏｇＩＢ＝１．８）发生浦氏位移，峰值从４８４ｎｍ移至５２５ｎｍ，且从颜色光适应对Ｓλ曲线的影响等都表明，真鲷存在两种以上的光感受系统，且具辨色能力。浦氏位移的光强水平较高，说明辨色能力不会很强。     

Numerical modelling and analysis of temperature controlled density currents in Tomales Bay, California

The coastal region adjacent to Tomales Bay, California is dominated by wind-driven upwelling during spring and summer and the cold, upwelled water is moved towards Tomales Bay, entering the estuary with the flood tide. If the tidal excursion is ≥6 km and the cold water subducts beneath the warmer, less dense estuarine water, a temperature controlled density current may form and intrude towards the head of the estuary as a thermally stratified bottom layer. The numerical modelling was aimed at determining the capability of the Delft3D-FLOW model to reproduce the cold ocean water intrusion events, the response (development and progression) of these intrusions to differing physical scenarios and the comparative importance of the parameters to the intrusions. The numerical model successfully reproduced the density intrusions and showed that the persistence and break down of the density intrusions were affected by a number of physical parameters, to varying degrees. The sensitivity analysis showed that density intrusion formation is controlled by tidal conditions and ocean water temperature. The strength and persistence of the developed density intrusions are influenced by wind, insolation and estuary depth. Fresh water inflow at the head of the estuary had no impact on the density intrusions. Three-dimensional numerical modelling is thus a valuable tool in understanding the estuary and its functioning.     

一类非线性系统次优控制的灵敏度法

本文研究一类非线性定常系统的次优控制问题。通过在系统中引入 1个灵敏度参数并将系统变量关于灵敏度参数展开 Maclaurin级数 ,使求解最优控制的非线性两点边值问题化为一族线性两点边值问题。利用截取最优控制级数的有限项求得系统的次优控制律。仿真实例表明 ,该方法对非线性系统次优控制律的设计是有效的     

Stochastic Analysis Method of Sea Environment Simulated by Numerical Models

1 .IntroductionNumericalmodelsmostwidelyusedforseaenvironmentandsedimenttransportfocusonsolvingseriesofdifferentialequations .Theinputandoutputofanumericalmodelareconsideredasdecisivefactors .Butinrealitythecausesofnaturaleventssuchasmeteorological,astronomical,oceanograph ic ,geomorphologicandgeophysicalfactorsarerandom .Therearemanyuncertaintiesinvolvedininputfactorsinnumericalmodels .Correspondinglytheoutputsofnumericalmodelsarealsorandom .There fore ,theoutputparametersofnumericalmodelsca…     

锯缘青蟹细菌性传染病的病原菌研究

从宁波市青蟹主要养殖海区5－9月间不同症状的病蟹体分离到6株细菌，S9901，S9902，S9903，S9904，S9905和S9906，经感染试验确定S9902、S9903、S9905和S9906均为病原菌；此4株菌革兰氏染色呈阴性，具1根极生鞭毛，氧化酶反应阳性，发酵葡萄糖，不产气，不发酵肌醇，对0／129试剂敏感，为弧菌属种类；经赖氨酸、精氨酸、乌氨酸脱羧酶、蔗糖、甘露醇发酵、6％氯化钠胨水生长、水杨素、枸橼酸盐利用等试验，根据第二代GYZ－9V系统，分别将其归为辛辛那提弧菌、溶藻弧菌和副溶血弧菌。4株菌对氯霉素、环丙沙星和硫酸庆大霉素等抗菌素表现出强敏感性，对诺氟沙星、磺胺甲异恶唑等中度敏感，而对头咆唑啉钠、呋喃唑酮不敏感；中草药五倍子和五味子煎出液对4株菌均 表现出较强的抑菌性能。     

海洋和海岸工程可靠度分析的几个问题

研究可靠度分析中的几个重要问题：１．直接求解非高斯过程、具有不同相关性的多变量情况下的结构失效概率问题；２．荷载的不确定性分析及其订正；３．荷载的相关性对结构失效概率的影响及灵敏度分析．作为实例对直立堤和导管架平台进行计算．     

Strength Sensitivity of Marine Ariake Clays

Natural Ariake clays are characterized by high sensitivity. In this study, the mechanism and the factors controlling undrained shear strengths of both undisturbed and remolded Ariake clays are discussed. A series of unconfined compressive tests were performed on undisturbed samples of natural Ariake clays. The remolded undrained shear strength is predicted using a quantitative expression derived from extensive data of remolded undrained shear strength for a number of soils compiled from resources in the literature. The sensitivity of natural Ariake clays derived from the ratio of half of unconfined compressive strength for undisturbed samples to remolded undrained shear strength is found to be affected by both natural water content and normalized water content that is defined as the ratio of natural water content to liquid limit. The smaller the natural water content, the higher the sensitivity is at the same normalized water content. At the same natural water content, the larger the normalized water content, the higher the sensitivity is.