An Assembly Coastal Building Technique in Port Engineering     

陈育民  刘汉龙  陈泽  高玉峰 《中国海洋工程》2009,23(2):379-386

The assembly coastal hfilding technique initiated at home and abroad,is for a novel vertical standing harbor structure.Its main concept is the assembling components which can be combined and locked together to form a large caisson.Its application and future are discussed for a building.After many years of application and tests,the technique has a high stability,a wide range of application,low workload and fast construction speed.It can be widely applied in future for harbor engineering projects.  相似文献   

地球化学资料定量识别层序地层单元技术综述     

朱红涛  庄文娟  黄众  刘强虎 《地质科技情报》2012,(6):67-73

应用地球化学资料识别层序地层单元的方法包括:碳氧同位素法、黏土矿物法、胶结物含量法、微量元素法、稀土元素法、TOC识别法、镜质体反射率法等。上述方法识别层序地层单元具有识别准确和分辨率高等优点,缺点是容易受到样品采样不连续的限制和受成岩作用、岩浆作用、构造作用等其他因素的影响。因此,在多地球化学指标结合识别层序地层单元的基础上,还应结合测井、地震、古生物等资料开展层序地层单元综合识别。  相似文献   

潜江凹陷北部潜江组油气分布不均一性及控制因素     

吴娟  叶加仁  康建云  梅加洛 《地质科技情报》2012,(6):141-146

通过对潜江凹陷北部潜江组已探明石油储量构成和分布特征的系统分析,总结出油气分布的不均一性及其控制因素。潜江凹陷北部潜江组不同层位、不同区带油气分布差异性明显,具有纵向分隔、横向分散等显著特征。油气的不均一性分布主要受控于3种地质因素:①膏盐韵律发育导致油气纵向分隔,膏盐岩极高的排驱压力有效地限制了流体的垂向运移,油气以侧向运移为主;②成熟烃源岩控制油气富集程度,油气纵向富集程度主要受成熟烃源岩层位的控制,蚌湖向斜带主力生烃灶控制了油气在平面上的富集;③输导条件控制油气的运移方式和纵横向分布范围,高渗砂体的侧向输导能力控制了断层不发育地区油气聚集的规模与平面分布范围,断层的垂向输导作用导致了主干断层发育地区油气在纵向上呈多层系分布。  相似文献   

低渗透储层微观孔隙结构与可动流体饱和度关系研究     

师调调  孙卫  何生平 《地质科技情报》2012,(4):81-85

针对常规压汞实验不能区别孔隙和喉道的弊端,应用恒速压汞技术对低渗透储层孔喉进行了定量评价,并深入分析了影响低渗透储层可动流体饱和度的主控因素。结果表明:渗透率越小,喉道半径分布范围越窄,其峰值也越小;反之,渗透率越大,喉道半径分布范围就越宽,其峰值也越大;不同物性的样品其孔隙分布特征不显著,主要体现为喉道分布特征不同。可动流体由孔隙和大喉道中的流体共同组成,与所处空间位置无关,只与孔隙和喉道半径有关。核磁共振可动流体的有效孔隙体积和有效喉道体积的共同下限半径也就是T2弛豫时间所对应的半径。  相似文献   

Visualizing the temporal development of thermo-radiative features on ground-based thermographs     

Kathrin Häb  Nils H. Feige  Lars S. Huettenberger  Ariane Middel  Hans Hagen 《Environmental Earth Sciences》2014,72(10):3781-3793

In urban microclimate research, ground-based thermography is used to gain insight into the spatial distribution of surface temperatures of various materials. Taking snapshots over a certain time span helps experts to observe the temporal thermo-radiative behavior of the monitored surface elements and therefore supports decisions on possible optimizations, e.g., improving the thermal comfort in a neighborhood. Appropriate visualization techniques facilitate decision-making and are thus crucial in the optimization process. In this study, we present a tool that eases the extraction of thermo-radiative features from multi-temporal thermographs taken from a monitored scene. Assisted by our tool, users can identify, choose, and register thermo-radiative features for each time step according to their individual research needs. The features’ temporal development is then visualized using a directed graph that encodes topological events as well as each feature’s size and summarizing statistics. To enhance this summary, a comprehensive animated sequence emphasizes the spatiotemporal behavior of the most significant thermo-radiative features. Salient developments are visually embedded and highlighted in the original infrared images, which are blended in an animation from time step to time step. Since we enable the user to interact with the data in a flexible way, noisy and low resolution image data sets can also be processed.  相似文献   

Hydrogeologic productivity in response to a conjugate compressive strike-slip relay: example of Sidi Bou Krime-Jalta area (northern Tunisia)     

Zouhaïr Mejri  Nouri Hatira  Chedhly Ben Hamza 《Arabian Journal of Geosciences》2011,4(1-2):189-197

Bore holes were drilled in the Senonian limestone of the Hedils-Jalta area (northern Tunisia) in order to determine their potential as an aquifer. Structural, tectonic and hydrogeologic data compilation shows the discrimination of productive and not productive zones. Differential hydraulic productivity was recognised with four distinct productive geological zones separated by a sterile corridor trending NW–SE. The structure consists of two compressional dihedrons, limited by two conjugate strike-slip faults, trending NNE–SSW and nearly E–W. The reduction of the (1) potential reservoir, (2) the low hydraulic productivity of the central band, (3) the torsion of the fold axis in eccentric arcs on both sides of the compressive relay and (4) the differential hydrogeological zonation are all related to the distribution of stress in the interference zone between conjugate strike-slip faults and to the reorientation of the stress field in their vicinity. This study constitutes a main database in establishing strategies for groundwater exploration in the similar zones.  相似文献   

基于图割与快速水平集的腹部CT图像分割     

杨昌俊  杨新 《CT理论与应用研究》2011,20(3):291-300

针对腹部CT图像中组织分割的问题,提出了一种基于图割与改进的快速水平集的交互式分割方法。首先对人工给定的一个待分割目标的初始轮廓作膨胀运算,将所得内部边界所有像素点作为源点、外部边界像素点作为汇点构造图,并通过图割方法对CT图像进行初步分割,然后以膨胀所得内部边界作为初始轮廓,通过基于区域竞争主动轮廓模型（RCAC）的...  相似文献   

Line-broadening effects in the powder infrared spectrum of apatite     

Etienne Balan  Simon Delattre  Damien Roche  Loïc Segalen  Guillaume Morin  Maxime Guillaumet  Marc Blanchard  Michele Lazzeri  Christian Brouder  Ekhard K. H. Salje 《Physics and Chemistry of Minerals》2011,38(2):111-122

The crystallinity of natural and synthetic apatite samples is often determined from the broadening of ν ₄ PO₄ infrared absorption bands. However, various physical mechanisms contribute to the observed linewidth. In the present study, the factors determining the linewidth in the powder spectrum of synthetic fluorapatite and hydroxyapatite samples are investigated. The temperature dependence of the infrared spectrum (10–270 K) is used to assess the respective contributions of homogeneous broadening, related to the decay of phonons through anharmonic coupling, and heterogeneous broadening related to elastic strain and macroscopic electrostatic effects. This latter contribution is dominant in the investigated samples and depends on the shape of powder particles. It is discussed under the light of the theoretical modeling of the low-frequency dielectric properties of apatite based on first-principles density functional theory calculations. The linewidth of the weak ν ₁ PO₄ absorption band provides a reliable information on microscopic sources of broadening, i.e., apatite crystallinity. In comparison, the other more intense PO₄ bands are more sensitive to long-range electrostatic effects.  相似文献   

Comprehensive physicochemical study of dioctahedral palygorskite-rich clay from Marrakech High Atlas (Morocco)     

Benaissa Rhouta  Ezzouhra Zatile  Lahcen Bouna  Omar Lakbita  Francis Maury  Lahcen Daoudi  Marie Christine Lafont  M’Barek Amjoud  François Senocq  Amane Jada  Ahmed Aït Aghzzaf 《Physics and Chemistry of Minerals》2013,40(5):411-424

This study is devoted to the physicochemical and mineralogical characterizations of palygorskite from Marrakech High Atlas, Morocco. The raw clay and its Na⁺-saturated <2 μm fraction were characterized using chemical, structural, and thermal analytical techniques. Measurements of specific surface area and porous volume are reported. The clay fraction was found to be made up of 95 % of palygorskite and 5 % of sepiolite. An original feature of this palygorskite is its deficiency in zeolitic H₂O. The half-cell structural formula of its dehydrated form was determined on the basis of 21 oxygens to be (Si_7.92Al_0.08)(Mg_2.15Al_1.4Fe_0.4Ti_0.05 $ \square_{1} $ )(Ca_0.03Na_0.08K_0.04)O₂₁, while the hydrated form could be formulated as (Si_7.97Al_0.03)(Mg_2.17Al_1.46Fe_0.40Ti_0.05)(Ca_0.03Na_0.07K_0,03)O_20.18(OH)_1.94(OH₂)_3.88·2.43 H₂O. These formulas show that the (Al³⁺+Fe³⁺)/Mg²⁺ ratio is around 0.84, revealing a pronounced dioctahedral character. Further, inside its octahedral sheet, it was determined that the inner M₁ sites are occupied by vacancies, whereas the M₂ sites are shared between 90 % of trivalent cations (78 % for Al³⁺ and 22 % for Fe³⁺), 7.5 % of Mg²⁺, and 2.5 % of Ti⁴⁺, all of them linked to 1.94 of structural hydroxyls. The two remaining Mg²⁺ by half-cell occupy edge M₃ sites and are coordinated to 3.88 molecules of OH₂. Channels of this palygorskite are deficient in zeolitic H₂O since they contain only 2.43 H₂O molecules. A correlation was found between these results and the observation of very intense and well-resolved FTIR bands arising from dioctahedral domains (mainly Al₂OH, Fe₂OH, and AlFeOH) along with very small responses from a trioctahedral domain (Mg₃OH). Accordingly, a schematic representation of the composition of the octahedral sheet was proposed. The cation exchange capacity, specific surface area, and total pore volume were also assessed to be ca. 21.2 meq/100 g, 116 m²/g, and 0.458 cm³/g, respectively.  相似文献   

柴西新生代沉积环境演变及其对阿尔金山隆起过程的启示     

周晓龙  李建星  岳乐平  杨利荣 《地质科技情报》2013,(4):97-101,118

柴西位于阿尔金山中段南麓山前,柴达木盆地内连续沉积了新生代地层,完整地记录了盆地自新生代以来的沉积过程。依据柴西新生代的岩性、岩相和岩相时空变化规律,沉积相从底部的冲积扇、洪积扇、扇三角洲相,向上逐渐变化为断陷湖泊相,到上油砂山组上段又由扇三角洲相向上逐渐变化为浅湖相,最终到下更新统七个泉组变为冲积扇、扇三角洲相。沉积物的粒度由粗—细—粗—细—粗,体现了一个断陷湖盆发生—发展—消亡—发生—发展—消亡的演化过程。再结合沉积相分析和砂岩组成成分分析可知,阿尔金山山体隆升具有多期次阶段性特征,存在3个期次的快速隆升:始新世中晚期—渐新世早期;中新世晚期;上新世中晚期—早更新世。  相似文献