菲律宾及其邻近地区的地磁场模型研究   总被引：2，自引：1，他引：1       下载免费PDF全文

狄传芝  顾左文  Bernardo M. Soriano  陈斌  Carina G. Lao  张毅  辛长江  高金田 《地球物理学报》2011,54(8):2085-2092

根据2001～2007年期间在菲律宾境内测量的74个点的地磁场数据,利用球冠谐和、泰勒多项式两种方法建立了2005.0菲律宾及周边地区地磁基本场模型,得到了菲律宾地区X、y、Z、D、I、H、F七个分量的分布.两种模型反映的同一地区的地磁场分布形态基本类似,只在拐点的舒缓度、等值线平滑度等方面存在区别.在8°N左右,X、...  相似文献   

Electric Well Logging of Hawaiian Basaltic Aquifers     

Frank L. Peterson  Chester Lao 《Ground water》1970,8(2):11-18

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南海西南海域的内波和细结构   总被引：9，自引：1，他引：9  

方欣华  鲍献文  张玉琳  劳治声 《海洋与湖沼》1994,25(1):1-8

根据１９９０年初夏南海西南部水域的两个连续站ＣＴＤ和多层海流计资料及５０多个大面站ＣＴＤ资料的分析研究得到一些关于此海域的内波和细结构的特性。它包括等温、盐、密度面起伏的特性，盐度双跃层和逆盐层等长存性细结构、温度Ｃｏｘ数的概率密度函数及流速频谱的特性，Ｃｏｘ数和温度脉动垂向波数谱的一般品性及其随水层和地域的变化规律等诸方面。  相似文献   

Distribution Survey of Soils in the Hainan Island and Their Physico-mechanical Properties     

Lao Guoli 《岩土力学》1988,9(4):51-61

This paper from the point of regional, based on the statistics and analyses on a great number of geotechnical test, deals with the geneses and composition of Hainan soils and the distribution law of various soils in the Hainan Island, the physico-mechanical properties of the soils are also discussed in the paper. All this is the summary on the work during the past three decades. The research results listed in the paper can be used to a certain extent as a reference for the development of the Hainan Island.  相似文献   

Investigation of microbial influences on seafloor gas-hydrate formations     

Guochang Zhang  Rudy E. Rogers  William T. French  Wenjian Lao 《Marine Chemistry》2007,103(3-4):359-369

Microbial communities flourish at gas hydrate occurrences in ocean sediments. Studies are reported in this paper on the laboratory production, separation, characterization and hydrate catalysis of biosurfactants from cultures of the Bacillus subtilis bacterium associated with Gulf of Mexico gas-hydrate accumulations. The B. subtilis bacterium from ATCC 21332 species was cultured anaerobically with glucose as carbon-source to produce surfactin, one of the more potent surface active agents known. The surface-active agent was removed from the broth in foam created by bubbling inert gas through the mixture, and biosurfactant was then recovered from the collapsed-foam distilled water solution by acid precipitation and dichloromethane extraction. According to HPLC spectra, five surfactin isomers were identified in the sample of laboratory-generated biosurfactant. Recovered surfactin was then used to perform gas-hydrate formation studies in porous media saturated with the surfactin-water solution. Gas-hydrate induction time and formation rate determinations showed that the anaerobically-produced biosurfactants catalyzed hydrate formation markedly. The tests suggest prolific surfactin production by the B. subtilis bacterium and of other species under prevailing anaerobic conditions around seafloor gas hydrates that promotes hydrate formation and the propensity of the bioproduct to be dispersed in the porous media by natural gas vents.  相似文献   

ARL8680型X射线荧光光谱仪故障维修几例     

劳建新刘雄光  王彦丽 《岩矿测试》2005,24(3):239-240

介绍瑞士ARL8680型X射线荧光光谱仪在更换高压发生器后出现的故障现象、原因及处理方法。  相似文献   

Web‐based real‐time visualization of large‐scale weather radar data using 3D tiles     

Mingyue Lu  Xinhao Wang  Xintao Liu  Min Chen  Shuoben Bi  Yadong Zhang  Tengfei Lao 《Transactions in GIS》2021,25(1):25-43

Weather radar data play an important role in meteorological analysis and forecasting. In particular, web‐based real‐time 3D visualization will enable and enhance various meteorological applications by avoiding the dissemination of a large amount of data over the internet. Despite that, most existing studies are either limited to 2D or small‐scale data analytics due to methodological limitations. This article proposes a new framework to enable web‐based real‐time 3D visualization of large‐scale weather radar data using 3D tiles and WebGIS technology. The 3D tiles technology is an open specification for online streaming massive heterogeneous 3D geospatial datasets, which is designed to improve rendering performance and reduce memory consumption. First, the weather radar data from multiple single‐radar sites across a large coverage area are organized into a spliced grid data (i.e., weather radar composing data, WRCD). Next, the WRCD is converted into a widely used 3D tile data structure in four steps: data preprocessing, data indexing, data transformation, and 3D tile generation. Last, to validate the feasibility of the proposed strategy, a prototype, namely Meteo3D at https://202.195.237.252:82 , is implemented to accommodate the WRCD collected from all the weather radar sites over the whole of China. The results show that near real‐time and accurate visualization for the monitoring and early warning of strong convective weather can be achieved.  相似文献   

航磁异常的构造解释和华北-塔南-扬子超陆块演化   总被引：11，自引：0，他引：11  

张家声  劳秋元  李燕 《地学前缘》1999,6(4):379-390

在现代地球磁场中,总体感磁效应与岩石的磁化率无关。典型地区大比例尺构造组构填图结果与岩石磁组构的对照分析,证明磁线理和构造线理具有一致的矢量特征。强烈韧性剪切导致岩石中区域一致的矿物定向和磁化率各向异性,是干扰现代地球磁场、产生特定航磁异常分布格局的主要因素。对五种基本的区域尺度构造 航磁异常样式的成因进行了分析,证明华北地区的航磁异常的分布样式与结晶基底的基本构造格架基本一致。并据此对塔里木、扬子地体基底岩石的构造性质进行了解释,提出存在前寒武纪华北－ 塔南－ 扬子超陆块。结合显生宙构造演化的地质证据,划分出新太古代克拉通化、古元古代左行韧性剪切改造和活动带发育、中－ 新元古代裂解和活动大陆边缘、古生代原地改造和中生代再裂解五个演化历史阶段  相似文献   

河南省嵩山地区登封群研究的新进展     

劳子强  王世炎 《地质通报》1999,(1):88

经重新研究,将原登封群分为３套岩石序列：（１）新太古代构造地层单位登封岩群,为变质表壳岩系,代表绿岩建造;（２）新太古代构造岩石单位,为变质侵入岩系;（３）古元古代侵入岩系。它们共同构成嵩山花岗岩—绿岩地体。新太古代岩石经历了嵩阳运动第一幕（约２．５Ｇａ）、第二幕（约２．２Ｇａ）和中岳运动（约１．９Ｇａ）３个重要变质变形期,据此建立的ｐ—Ｔ—ｔ—Ｄ轨迹显示花岗岩—绿岩地体变质变形与陆壳碰撞隆升过程有密切关系  相似文献   

油气混输系统的实验研究与实验模拟准则   总被引：2，自引：0，他引：2  

吴应湘  郑之初  李东晖  劳力云  马艺馨 《海洋工程》1999,17(4)

描述了油气混输系统的实验研究,特别是多相流的流态、增压、计量系统的实验研究,并用动力相似理论分析了油气混输两相管流实验模拟所需满足的相似参数,提出了各种简化条件下的相似规律,讨论了用水和空气的两相流动来模拟原油和天然气的两相流动的可靠性和提高实验精度的手段和方法。  相似文献