荔湾3-1外输海底管道中落管抛石技术   总被引：1，自引：0，他引：1  

王猛  孙国民 《海洋工程》2015,33(3):86-92

落管抛石是进行深水抛石的一种工程技术,可作为保证管道稳定性、处理悬跨、抑制隆起屈曲和进行跨越支撑的工程解决方案。系统研究了抛石在波流作用下的稳定性,落石对管道冲击的影响以及施工技术。针对南海环境条件下的抛石稳定理论进行了修正;分析了三层聚丙烯涂层管道在落石冲击下的可接受抛石粒径;提出同时结合石块稳定性结果和管道抗冲击性能要求下的石料分级的方法;最后,对该技术在荔湾3-1外输海底管道的工程应用进行详细阐述。  相似文献   

华中地区历史物候记录与1850-2008年的气温变化重建     

郑景云  刘洋  葛全胜  郝志新 《地理学报》2015,70(5)

根据历史日记中的华中地区春季植物物候、清代档案中的湖南4地降雪日数记载和区内5个树轮宽度年表,以及植物物候期、雪日观测记录等代用资料;以器测的华中整个地区的逐年气温距平为校准序列,采用逐步回归方法,结合逐一剔除法验证和方差匹配技术,重建了1850-2008年华中地区年均气温变化序列。结果表明:1自1850年以来,华中地区气温变化以年际至年代尺度波动为主要特征;但至1990年以后则迅速增暖,并超出了原有的年代际波动水平;而1920s中期至1940s中期的温暖尽管也持续了20年,但其温暖程度显著低于1990s-2000s。其间,最寒冷年代则分别出现在1860s、1890s及1950s,最寒冷的年份为1893年。2华中地区1850年以来的气温年代际波动周期为10~20年和准35年,其中1920s以前主要为12~14年,但自1940s开始则转为18~20年以及准35年。  相似文献   

Chemical and physical properties affecting strontium distribution coefficients of surficial-sediment samples at the Idaho National Engineering and Environmental Laboratory, Idaho     

M. J. Liszewski  J. J. Rosentreter  K. E. Miller  R. C. Bartholomay 《Environmental Geology》2000,39(3-4):411-426

 The U.S. Geological Survey and Idaho State University, in cooperation with the U.S. Department of Energy, conducted a study to determine strontium distribution coefficients (K_ds) of surficial sediments at the Idaho National Engineering and Environmental Laboratory (INEEL). Batch experiments using synthesized aqueous solutions were used to determine K_ds, which describe the distribution of a solute between the solution and solid phase, of 20 surficial-sediment samples from the INEEL. The K_ds for the 20 surficial-sediment samples ranged from 36 to 275 ml/g. Many properties of both the synthesized aqueous solutions and sediments used in the experiments also were determined. Solution properties determined were initial and equilibrium concentrations of calcium, magnesium, and strontium, pH and specific conductance, and initial concentrations of potassium and sodium. Sediment properties determined were grain-size distribution, bulk mineralogy, whole-rock major-oxide and strontium and barium concentrations, and Brunauer-Emmett-Teller (BET) surface area. Solution and sediment properties were correlated with strontium K_ds of the 20 surficial sediments using Pearson correlation coefficients. Solution properties with the strongest correlations with strontium K_ds were equilibrium pH and equilibrium calcium concentration correlation coefficients, 0.6598 and –0.6518, respectively. Sediment properties with the strongest correlations with strontium K_ds were manganese oxide (MnO), BET surface area, and the >4.75-mm-grain-size fraction correlation coefficients, 0.7054, 0.7022, and –0.6660, respectively. Effects of solution properties on strontium K_ds were interpreted as being due to competition among similarly charged and sized cations in solution for strontium-sorption sites; effects of sediment properties on strontium K_ds were interpreted as being surface-area related. Multivariate analyses of these solution and sediment properties resulted in r² values of 0.8071 when all five properties were used and 0.8043 when three properties, equilibrium pH, MnO, and BET surface area, were used. Received: 30 November 1998 · Accepted: 16 February 1999  相似文献   

Improvement in the calculation of anti-Stokes energy transfer and experimental justification based on Er_0.01Yb_xY_{1 - 0.01 - x}VO₄ crystal     

陈晓波  卢建  张蕴芝  徐小灵  冯宝华  王策  Gregory J. Salamo  杨国建 《海洋学报(英文版)》2010,29(9)

The improvement on the calculation of anti-Stokes energy transfer rate is studied in the present work. The additional proportion coefficient between Stokes and anti-Stokes light intensities of quantum Raman scattering theory as compared with the classical Raman theory is introduced to successfully describe the anti-Stokes energy transfer. The theoretical formula for the improvement on the calculation of anti-Stokes energy transfer rate is derived for the first time in this study. The correctness of introducing coefficient exp{ΔE / kT} from well-known Raman scatter theory is demonstrated also. Moreover, the experimental lifetime measurement in Er_0.01Yb_xY_{1 - 0.01 - x}VO₄ crystal is performed to justify the validity of our important improvement in the original phonon-assisted energy transfer theory for the first time.  相似文献   

英文地震科技论文汉译技巧探讨     

李晶 《高原地震》2014,26(4):62-65

简述了英文科技论文的特点尤其是英文地震科技论文的独特性.以英文地震科技论文的独特性为基础,从用词风格的解读与诠释、专业地震词汇的识别与表述、繁杂的符号、公式、图表的处理以及长句、结构复杂句的阐明四个方面对其汉语翻译的技巧进行了探讨.  相似文献   

Characteristics and accumulation mechanisms of the Dongfang 13-1 high temperature and overpressured gas field in the Yinggehai Basin,the South China Sea     

YuHong Xie  BaoJia Huang 《中国科学:地球科学(英文版)》2014,57(11):2799-2807

The Dongfang 13-1 is located in the diapiric structure belt of the Yinggehai Basin. The formation pressure of its main gas reservoir in the Miocene Huangliu Formation is up to 54.6 MPa(pressure coefficient=1.91) and the temperature is as high as 143°C(geothermal gradient 4.36°C/100 m), indicating that it is a typical high-temperature and overpressured gas reservoir. The natural gas is interpreted to be coal-type gas derived from the Miocene mature source rocks containing type II2-III kerogens as evidenced by high dryness index of up to 0.98 and heavy carbon isotopes, i.e., the δ13C1 ranging from -30.76‰ to -37.52‰ and δ13C2 ranging from -25.02‰ to -25.62‰. The high temperature and overpressured Miocene petroleum system is related mainly to diapir in the Yinggehai Basin and contains more pore water in the overpressured reservoirs due to undercompaction process. The experimental and calculated results show that the solubility of natural gas in formation water is as high as 10.5 m3/m3 under the temperature and pressure conditions of the Sanya Formation, indicating that at least part of the gas may migrate in the form of water-soluble phase. Meanwhile, the abundant gas source in the Basin makes it possible for the rapid saturation of natural gas in formation water and exsolution of soluble gas. Therefore, the main elements controlling formation of the Dongfang 13-1 gas pool include that(1) the diapir activities and accompanying changes in temperature and pressure accelerate the water-soluble gas exsolution and release a lot of free gas;(2) submarine fan fine sandstone in the Huangliu Formation provides good gas-water segregation and accumulation space; and(3) the overlying overpressured mud rocks act as effective caps. The accumulation mechanism reveals that the high temperatural and high pressure structure belt near the diapir structures has a good potential for large and medium-sized gas field exploration.  相似文献   

Mutations in Exons of the CYP17-Ⅱ Gene Affect Sex Steroid Concentration in Male Japanese Flounder（Paralichthys olivaceus）     

MA Ruiqin  HE Feng  WEN Haishen  LI Jifang  SHI Bao  SHI Dan  LIU Miao  MU Weijie  ZHANG Yuanqing  HU Jian  HAN Weiguo  ZHANG Jianan  WANG Qingqing  YUAN Yuren  LIU Qun 《青岛海洋大学学报(英文版)》2012,(1):99-104

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国土资源涉密计算机泄密隐患分析与防范——以费县国土资源局为例          下载免费PDF全文

姜泉  邢兆波  密长林 《山东国土资源》2012,28(5):44-47

依据信息安全等级保护有关政策和标准,结合费县国土资源局信息化建设中涉密计算机管理工作实际,探讨如何从计算机信息输入和输出2个方面有效预防计算机失窃密。从计算机身份认证与访问控制、网口、UBS口电磁辐射,办公设备5个方面分析泄密隐患,并提出相应的应对措施,强调了在国土资源系统涉密计算机管理方面要加强保密意识,提高防范技能。  相似文献   

成都气象数据库监控系统的设计与实现          下载免费PDF全文

张宇 《高原山地气象研究》2014,34(1):86-89

本文介绍了民航西南地区空中交通管理局气象中心数据库室在长期的设备维护过程中,根据自身的工作经验,设计和实现的气象数据库监控系统。这套系统的设计目的是为了减轻数据库系统维护人员的工作压力,让维护人员能够第一时间发现系统隐患或问题。本系统在VS2008下用C#语言进行实现,并同时结合面向对象的编程理念和采用了多线程技术。   相似文献   

基于Rsync的中央气象台数据备份机制及优化设计          下载免费PDF全文

林玉成  赵瑞  罗兵 《高原山地气象研究》2014,34(1):81-85

中央气象台实时业务中的数据支持是完成全国灾害性天气监视预报的核心支撑,每天使用的实时数据更新量大于500G,其中大量数据需要不间断使用,因此实时数据备份及在异常情况下的及时恢复对中央气象台的实时业务保障显得十分重要。中央气象台在业务中使用的操作系统种类较多,文件存取使用方式及各类数据权限各不相同,通过研发与实践提出基于Rsync同步数据传输机制的数据备份方案,并在实际使用中逐步优化,实现了对不同种类的数据及操作系统实行不同的备份策略,在实际业务中起到了较好的效果。   相似文献