An Improved Formulation for the Ultimate Static Strength of Tubular Joints subjected to Combined Loads

"The effect of interaction of loads on the ultimate static strength of tubular joints of offshore fixed platforms, is a practical problem. But there is still absence of rigorous theory to explain available experimental data and empirical criteria for the static strength of tubular joints. The idea of yield at hot spot of tubular joints is introduced in this paper. The interaction equations of plastic capacity for the tubular joints under combined loads (two and three different kinds) are derived. Thereafter the Yura's test data and empirical criteria of ultimate static strength for the tubular joints can be explained. The idea of classification of category of loads in accordance with experimental data and the present theory is suggested. Finally, the improved ultimate capacity equations for tubular joints are recommended. The physical significance of the coefficient of plastic reservation Qp is discussed.     

中国对虾甲壳褐斑病的扫描电镜研究

本文报导了病虾溃疡甲壳的扫描电镜观察结果。由于细菌的侵蚀,甲壳有不同程度的溃疡病变。由甲酚类物质组成的表壳层结构普遍受损,呈剥离状。外壳层和含钙内壳层也有大面积的深度损害。刚毛断裂的结构显示,刚毛由内轴和外鞘组成,外鞘厚度约为1μm,内轴为实心,厚度约为5μm,轴鞘结构之间有一宽度为0.5μm的间隙。     

Dynamic Ice-Induced Responses of Offshore Fixed Platforms

The dynamic responses of offshore fixed platforms under ice loads are analysed in this paper. The responses calculated include the displacement and the hot spot stresses on the basis of a dynamic equation of ice-induced forced vibration for offshore structures. The results obtained can be cited and used for the design and operation of offshore fixed platforms against ice loading.     

中国对虾养成期细菌性黑鳃,褐斑综合症的病原生物学研究

本文是对中国对虾黑鳃、褐斑综合症进行病原菌分离和人工感染试验的报告。经细菌学鉴定表明,分离菌分别为海弧菌Vibrio pelagius Baumann和溶藻弧菌Vibrio alginolyticus sakazaki。人工感染试验显示,海弧菌是引起对虾黑鳃、褐斑综合症的主要病原菌,溶藻弧菌的合并感染导致对虾败血死亡。此外还应用电子显微镜对分离纯化的病原细菌进行了超微结构观察。     

两种气象绘图软件的对比及应用

介绍了Surfer 8.0和G rads(v1.8L11版本)两个等值线绘制软件的功能,根据不同的业务需要,可采用不同的绘图软件,以提高工作效率。     

论风景名胜区内旅游开发建设项目的环境影响评价

风景名胜区旅游资源必须实行保护性开发，在风景名胜区内的旅游开发建设项目环境影响评价工作，应根据风景名胜区较为独特的自然和社会环境状况，全面并有重点地对旅游开发建设项目所带来的环境影响进行分析预测，有针对性地提出切实可行并行之有效的环境保护措施。螺丝壳山风景名胜区旅游开发项目的环境影响评价，应遵循这些原则。     

天水及其南北地区温泉分布的地质—地球物理特征

根据天水及其南北地区温泉分布众多的现象,从分析地质、地球物理场着手,探讨温泉形成的区域与深部地质构造背景以及热缘机制。区内近南北向隐伏断裂发育,中酸性侵入岩、碱性玄武喷发岩构成近南北向岩浆构造带;在深部软流圈埋深变浅,岩石圈减薄、上地幔热物质上涌引起莫霍面上隆;中地壳低速、高导层同步出现;地表热流值增高,温泉呈网格状分布。该区温泉是甘肃省隆起断裂对流型地热资源有利开发地段。     

Lipid biomarkers and carbon-isotopes of modern travertine deposits (Yellowstone National Park, USA): Implications for biogeochemical dynamics in hot-spring systems

Lipid biomarkers and ¹³C fractionation patterns were used to understand the dynamics of carbon cycling during microbial metabolisms in different environments of travertine precipitation (called facies) at Spring AT-1 on Angel Terrace in the Mammoth Hot Springs complex of Yellowstone National Park, USA. Microbial mats that encrust travertine deposits were collected for analyses of lipid biomarkers and carbon isotopes along the continuous drainage outflow system of Spring AT-1. The spring water exhibits a continuous temperature drop from 71°C in the vent at top to 24°C in the distal slope at bottom. Phospholipid fatty acids (PLFA) and glycolipid fatty acids (GLFA) exhibit distinctly different compositions in each of the facies, which are consistent with partitioning of the bacterial 16S rRNA gene sequences in the Spring AT-1 travertine facies (Fouke et al., 2003).The δ¹³C composition of total biomass within the microbial mats decreases from −16.1‰ in the vent to −23.5‰ in the distal slope. However, lower values occur in the pond (−26.0‰) and the proximal slope (−28.0‰) between the vent and the distal slope. Isotopic compositions of PLFA and GLFA have variations similar to those of total biomass. The average δ¹³C values of PLFA are −12.4 ± 5.2‰ (n = 10 individual fatty acids, same below) in the vent, −33.0 ± 3.1‰ (n = 11) in the pond, −33.7 ± 3.8‰ (n = 16) in the proximal slope, and −22.4 ± 3.4‰ (n = 10) in the distal slope; the average δ¹³C values of GLFA are −19.6 ± 3.0‰ (n = 3) in the vent, −30.4 ± 4.7‰ (n = 8) in the pond, −36.9 ± 2.8‰ (n = 12) in the proximal slope, and −27.9 ± 3.1‰ (n = 13) in the distal slope. In particular, fatty acids in the vent are enriched in ¹³C relative to the total biomass, which is consistent with the notion that the biosynthetic pathways of the extant microbial community in the vent may be dominated by Aquificales using the reversed tricarboxylic acid cycle. Fractionations between fatty acids and total biomass in the pond, the proximal slope and the distal slope suggest the involvement of other biosynthetic pathways for CO₂ fixation by extant microbial populations. The results indicate that lipid biomarkers provide valuable information on the changing diversity and activity of microbial communities in different depositional environments. Carbon-isotope fractionations, on the other hand, can provide insight into the operating biosynthetic pathways associated with different organisms in the changing environment. This integrated approach may serve as a powerful tool for identifying functional metabolism within a community and identify shifts in microbial community structure in modern hot-spring systems.     

山东省胶东半岛两次疑难历史地震的考证

山东省的胶东半岛历史悠久,是我国文化发展较早的地区之一。根据有关史料的记载,该区曾发生过１０４６年,４９５年虞丘山两次历史地震。但在确定地震参数时,由于历史原因,对史料中记载的“虞丘山”的位置说法不一,因而,对这两次地震的震中位置和震级存在不同的意见。     

四川省地质遗迹景观信息系统设计

经过漫长的地质时期留下来的地质遗迹具有重要的美学、历史文化和科学研究价值，开发地质遗迹有利于区域经济发展。通过对四川省地质遗迹赋存状况与保护情况的分析，针对利用和保护中存在的不足，探讨用GIS（地理信息系统）技术建立完善的地质遗迹保护体系模式，介绍了运用ARCGIS二次开发包，开发建立在地质遗迹空间数据库基础上的，集属性及影音图片信息于一体的管理系统，提供多种空间分析手段为地质遗迹的保护提供决策分析，引导地质遗迹保护工作进入可持续发展的范畴。