荧光法在赤潮图像分析中应用

为解决探测和分析包含复杂背景沉淀物样品中的微藻的问题,利用微藻类在一定波长光的照射下会产生荧光的特性,对裸甲藻等多种藻类进行荧光实验处理。并在荧光实验的基础上进行阈值分割,轮廓和纹理分析及图像识别等后继图像处理,实验证明,荧光法可以有效的去除背景噪声,使得后继的图像处理容易和有效,从而解决了探测和分析包含复杂背景的沉淀物样品中微藻的问题。     

安装期单层保温管层间剪切力分析

在浅水海域,采用单层保温管结构代替双重钢管保温结构具有很好的发展应用前景,但在单层管的铺设过程中管线各层之间和保温层内将产生较大的剪应力,如何防止各层间的错动和保温层材料的剪切破坏是设计所必须解决的两个主要问题。以渤海某油田海底管线建设项目为例,根据单层保温管的结构特点,力的层间传递特性和变形协调条件,建立了单层保温管各层层间剪切力和保温层中剪应力的计算方法,为海底单层保温管的设计提供了依据。     

斜向挤压叠加变形的构造解析 ——以四川威远地区为例

威远地区位于四川盆地西南部,其构造主体威远背斜属于大型穹隆状背斜构造,经历了多期构造运动的叠加变形,前人对威远背斜的形成过程与机制认识存在很大争议,无法满足油气精细勘探和高效开发的需要。本文通过地震资料的构造解析,确定威远背斜主体是在基底先存构造(NE向基底古隆起)的条件下,在燕山期近NS向斜向挤压作用过程中形成的,喜山期近EW向斜向挤压作用对其构造变形也有一定的贡献。按此认识设计了砂箱模拟实验,实验结果在平面和剖面上很好地再现了威远背斜的构造特征,表明了上述认识的合理性。这些认识不仅能为威远地区油气的勘探开发提供指导,还可以为相似区域的构造形成演化机制分析提供借鉴。     

Evaluation of CMIP5 Climate Models in Simulating 1979–2005 Oceanic Latent Heat Flux over the Pacific

The climatological mean state,seasonal variation and long-term upward trend of 1979–2005 latent heat flux(LHF) in historical runs of 14 coupled general circulation models from CMIP5(Coupled Model Intercomparison Project Phase 5) are evaluated against OAFlux(Objectively Analyzed air–sea Fluxes) data. Inter-model diversity of these models in simulating the annual mean climatological LHF is discussed. Results show that the models can capture the climatological LHF fairly well,but the amplitudes are generally overestimated. Model-simulated seasonal variations of LHF match well with observations with overestimated amplitudes. The possible origins of these biases are wind speed biases in the CMIP5 models. Inter-model diversity analysis shows that the overall stronger or weaker LHF over the tropical and subtropical Pacific region,and the meridional variability of LHF,are the two most notable diversities of the CMIP5 models. Regression analysis indicates that the inter-model diversity may come from the diversity of simulated SST and near-surface atmospheric specific humidity.Comparing the observed long-term upward trend,the trends of LHF and wind speed are largely underestimated,while trends of SST and air specific humidity are grossly overestimated,which may be the origins of the model biases in reproducing the trend of LHF.     

闽赣交界桃溪穹隆与外围印支期花岗岩岩石地球化学特征对比及地质意义

以桃溪穹隆与外围印支期花岗岩为研究对象,认为桃溪穹隆花岗岩更具壳源特征,表现为与壳源物质有关的矿物较多,岩石呈酸性和碱性程度更高,桃溪穹隆花岗岩高场强元素的亏损程度和亲石元素富集程度都大于穹隆外围,桃溪穹隆花岗岩δEu的亏损程度远大于穹隆外围.Sr-Yb元素特征还显示,印支时期地壳部分重熔形成花岗岩时,桃溪穹隆应处于地...     

Dynamic changes in urban land spatial inequality under the core-periphery structure in urban agglomerations

Relatively coordinated development among cities can typically promote the integration of the whole urban agglomeration, while urbanization of land has been found important to economic development in developing countries. Numerous studies have measured the urban land expansion in urban agglomerations. However, urban land spatial inequality under a specific spatial structure remains poorly understood. Here, we combined the β-convergence model and the core-periphery structure to explore the dynamic...     

Change of Soil Organic Carbon after Cropland Afforestation in ′Beijing-Tianjin Sandstorm Source Control′ Program Area in China

Land use change is one of the major factors that affect soil organic carbon(SOC) variation and global carbon balance. However, the effects of land use change on SOC are always variable. In this study, using a series of paired-field experiments, we estimated the effects of revegetation types and environmental conditions on SOC stock and vertical distribution after replacement of cropland with poplar(Populus tomentosa) and korshinsk peashrub(Caragana korshinskii) in three climate regions(Chifeng City, Fengning City and Datong City of the ′Beijing-Tianjin Sandstorm Source Control′(BTSSC) program area. The results show that SOC sequestration rate ranges from 0.15 Mg/(ha·yr) to 3.76 Mg/(ha·yr) in the soil layer of 0–100 cm in early stage after cropland afforestation in the BTSSC program area. The SOC accumulation rates are the highest in Fengning for both the two vegetation types. Compared to C. korshinskii, P. tomentosa has greater effects on SOC accumulation in the three climate regions, but significantly greater effect only appears in Datong. The SOC density increases by 20%–111% and 15%–59% for P. tomentosa and 9%–63% and 0–73% for C. korshinskii in the 0–20 cm and 20–100 cm soil layers, respectively. Our results indicate that cropland afforestation not only affects SOC stock in the topsoil, but also has some effects on subsoil carbon. However, the effect of cropland afforestation on SOC accumulation varied with climate regions and revegetation types. Considering the large area of revegetation and relatively high SOC accumulation rate, SOC sequestration in the BTSSC program should contribute significantly to decrease the CO2 concentration in the atmosphere.     

江西省国土资源厅数据灾备系统建设实践

随着江西省国土资源信息化建设的不断深入,国土资源数据积累不断丰富,对数据存储系统有更高的需求,建设一套高性能、高安全性、高可靠性、可扩展性的集中存储系统,实现数据的本地灾备和异地容灾成为信息化建设的当务之急。鉴于此,江西省国土资源厅采用数据镜像、数据备份和连续数据保护（CDP）等技术,开展厅数据中心的灾备系统建设,并进行了系统演练,效果良好。