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桶形基础平台海上沉放安装 总被引：3，自引：1，他引：3
桶形基础平台是世界上一种最新型的海洋平台，可广泛应用于海上油气田开发。为满足我国际油气田开发中卫星平台的结构和功能要求，桶形基础平台采用新的压载沉放方法安装，具有更高的效率和经济性。沉放过程中桶形基础平台受到水流和波浪的作用，结合模型试验对平台运动进行数值模拟分析，以了解在整个沉放过程中相应参数的变化趋势。根据桶形基础平台的特征，制定联台沉放方案，并通过压载实现平台的沉放控制。 相似文献
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海上平台桶形基础模型负压沉贯试验数据处理与分析 总被引：1，自引：0，他引：1
海上平台桶形基础是一种新型海洋石油开发技术,其特点是利用负压将桶形基础贯入海底。本文介绍了单模型和四桶模型平台负压沉贯试验数据处理方法,对负压作用下桶形基础的沉贯过程进行了分析,探索出桶形基础平台机理现场条件下的沉贯方法。 相似文献
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桶基平台负压沉贯施工机具的研究与应用 总被引：1，自引：0，他引：1
桶形基础采用负压沉贯方法施工,初始入泥和倾斜控制成为制约桶形基础平台应用于浅水区的重要环节。通过分析沉贯、倾斜调整机理,设计了１种负压沉贯施工机具,并成功应用于ＣＢ２０Ｂ桶形基础平台的海上安装,对浅水区桶形基础平台施工机具研究开发具有指导意义。 相似文献
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海上现场试验对于桶形基础平台的沉贯安装十分重要。论述了桶形基础平台原型单桶模型在海上现场负压沉贯的方案、方法和过程,得出了试验结论,并将试验成果成功应用于ＣＢ２０Ｂ采油工艺平台的海上沉贯安装,对浅水区桶形基础平台的现场施工具有指导意义。 相似文献
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海上现场试验对于桶形基础平台的沉贯安装十分重要.论述了桶形基础平台原型单桶模型在海上现场负压沉贯的方案、方法和过程,得出了试验结论,并将试验成果成功应用于CB20B采油工艺平台的海上沉贯安装,对浅水区桶形基础平台的现场施工具有指导意义. 相似文献
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桶形基础平台安装就位智能化测控装置 总被引：3，自引：0，他引：3
近年来,国内外海上平台开始采用桶形基础（几米浅基础）代替一直沿用的桩基础（几十米深基础）,其安装就位采用与打桩施工完全不同的负压沉贯的施工方法。介绍了一种用于桶形基础平台在负压沉贯施工中的智能化测控装置。该装置成功地用于我国首座桶形基础平台（胜利油田ＣＢ２０Ｂ平台）的安装就位施工,取得了预期的效果。为我国今后桶形基础平台负压沉贯施工中的智能化测控提供有益的借鉴。 相似文献
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分析和描述了胜利石油管理局建成的ＣＢ２０Ｂ浅海桶基平台桶形基础结构特点,讨论了结构设计应解决的主要问题、桶形基础结构型式和尺度、桶形基础结构设计以及强度和稳定性计算。 相似文献
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探讨了壳寡糖及全乙酰壳寡糖的制备方法,通过正交实验考察了原料、温度、时间对降解产物的影响.制备了八种寡糖（八乙酰壳二糖、十一乙酰壳三糖、十四乙酰壳四糖和十七乙酰壳五糖,以及N,N′-二乙酰壳二糖、N,N′,N″-三乙酰壳三糖、N,N′,N″,N′′′四乙酰壳四糖和N,N′,N″,N′′′,N′′′′-五乙酰壳五糖）,并通过IR、NMR及MS等确定了其化学结构. 相似文献
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Adsorption and desorption of proteins and polyamino acids by clay minerals and marine sediments 总被引：1，自引：0，他引：1
The adsorption and desorption of proteins and polyamino acids on illite, montmorillonite, goethite, and marine sediments was investigated. Three 14C-labeled hydrophilic proteins, Rubisco from C. reinhardtii, and GroEL and GroES from genetically modified Escherichia coli, were synthesized and purified for this study. The proteins were strongly and rapidly adsorbed by the clay minerals and marine sediments, and much of the adsorbed protein was not readily desorbed. Sodium dodecyl sulfate (SDS) extraction and separation by SDS-polyacrylamide gel electrophoresis (PAGE) and sucrose density gradients showed that Rubisco and GroEL were adsorbed on illite and sediments in their original forms. The apparent adsorption partition coefficients of the proteins were on the order of 102 l/kg on illite, 103–104 l/kg on goethite and montmorillonite, and 200 and 75 l/kg on Skan Bay and Resurrection Bay (Alaska) sediments, respectively. These partition coefficients are sufficiently large to permit sedimentary protein preservation via an adsorptive mechanism. Generally, basic polyamino acids had greater adsorption partition coefficients than acidic polyamino acids. Molecular size did not affect the electrostatic interaction between polyamino acids and mineral surfaces. Adsorption of bovine serum albumin (BSA) and negatively charged polyamino acids inhibited Rubisco adsorption, while positively charged cytochrome c and polyamino acids increased Rubisco adsorption. These results indicate that electrostatic interactions dominated in protein adsorption. 相似文献
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Coastal and estuarine habitat mapping, using LIDAR height and intensity and multi-spectral imagery 总被引：3，自引：1，他引：2
Guillem Chust Ibon Galparsoro ngel Borja Javier Franco Adolfo Uriarte 《Estuarine, Coastal and Shelf Science》2008,78(4):633-643
The airborne laser scanning LIDAR (LIght Detection And Ranging) provides high-resolution Digital Terrain Models (DTM) that have been applied recently to the characterization, quantification and monitoring of coastal environments. This study assesses the contribution of LIDAR altimetry and intensity data, topographically-derived features (slope and aspect), and multi-spectral imagery (three visible and a near-infrared band), to map coastal habitats in the Bidasoa estuary and its adjacent coastal area (Basque Country, northern Spain). The performance of high-resolution data sources was individually and jointly tested, with the maximum likelihood algorithm classifier in a rocky shore and a wetland zone; thus, including some of the most extended Cantabrian Sea littoral habitats, within the Bay of Biscay. The results show that reliability of coastal habitat classification was more enhanced with LIDAR-based DTM, compared with the other data sources: slope, aspect, intensity or near-infrared band. The addition of the DTM, to the three visible bands, produced gains of between 10% and 27% in the agreement measures, between the mapped and validation data (i.e. mean producer's and user's accuracy) for the two test sites. Raw LIDAR intensity images are only of limited value here, since they appeared heterogeneous and speckled. However, the enhanced Lee smoothing filter, applied to the LIDAR intensity, improved the overall accuracy measurements of the habitat classification, especially in the wetland zone; here, there were gains up to 7.9% in mean producer's and 11.6% in mean user's accuracy. This suggests that LIDAR can be useful for habitat mapping, when few data sources are available. The synergy between the LIDAR data, with multi-spectral bands, produced high accurate classifications (mean producer's accuracy: 92% for the 16 rocky habitats and 88% for the 11 wetland habitats). Fusion of the data enabled discrimination of intertidal communities, such as Corallina elongata, barnacles (Chthamalus spp.), and stands of Spartina alterniflora and Phragmites australis, which presented misclassification when conventional visible bands were used alone. All of these results were corroborated by the kappa coefficient of agreement. The high classification accuracy found here, selecting data sources, highlights the value of integrating LIDAR data with multi-spectral imagery for habitat mapping in the intertidal complex fringe. 相似文献
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