天山冰碛物中的花粉组合及冰期环境

通过对天山乌鲁木齐河源区和天山南麓台兰河口区、木扎尔特河口区冰碛物中花粉分析，表明在冰期阶段不同区域的花粉组合均以灌木及为主，乔木含量很低，反映冰川所到之处距云杉林均大于５ｋｍ。冰期阶段，天山南北坡环境差异明显，北坡以草原为主，南麓带以荒漠草原为主，山地气候较现代干燥，山麓地带较现代略湿润。     

政和地区变质岩石的变质结晶作用与变形作用的关系

政和地区变质岩石在晋宁期遭受了３期构造变形作用（Ｄ）。以这３期构造变形作用为相对时间标志，讨论了变质砂泥质岩石中各种不同产状、不同种类变质矿物的生长期，确定了基质主要加粗期为Ｄ２－Ｄ３变形期间的静态期。进而将晋宁期变质作用划分为早期、主期和晚期３个变质阶段，变质作用的主期为Ｄ２变形期和Ｄ２－Ｄ３变形期间静态期。     

渤海湾盆地济阳坳陷断裂变形带微观特征

正变形带是指发育在高孔隙岩石中,在局部压实、膨胀或剪切的作用下,由颗粒滑动、旋转以及破碎形成的带状亚地震构造(Haakon Fossen et al.,2007;刘志达等,2017;王海学等,2018)。变形带广泛发育在砂岩储层中,是诱导裂缝带的重要构造类型之一。区别于裂缝,变形带对储层的改造作用较复杂,主要受控于变形带类型及其变形机制。     

海南岛东南海域碎屑锆石年代学物源示踪及构造指示意义

为探索海南岛东南海域表层沉积物来源,揭示物源区主要地质构造演化事件,采用箱式取样法获取8个站位沉积物样品,进行锆石U-Pb定年.结果表明,773个有效年龄分布在33~3 205 Ma,主要年龄峰集中在燕山期(100 Ma、140 Ma和159 Ma)、印支期(242 Ma)和加里东期(439 Ma),次要年龄峰集中在新元古代(776 Ma、965 Ma)和古元古代(1 836 Ma、2 487 Ma),并零星保留太古宙基底年龄信息.少量变质锆石记录了加里东期和印支期强烈的变质事件.与潜在物源区对比分析表明,海南岛东南海域沉积物以约100 Ma的年龄峰值为识别标志,主要来源于海南岛.结合前人资料,本研究年龄频谱指示加里东期华夏武夷-云开造山带可延伸到海南岛,海西-印支期古特提斯洋的闭合及印支-华夏地块的碰撞导致其强烈的构造-岩浆-变质作用,燕山期受太平洋板块俯冲的影响发育多期次岩浆活动.      

Inclined single piles under vertical loadings in cohesionless soil

Physical-scaled model testing under 1 g conditions is carried out in obtaining the vertical response of fixed head floating-inclined single piles embedded in dry sand. Practical pile inclinations of 5° and 10° besides a vertical pile (0°) subjected to static and dynamic vertical pile head loadings are considered. To account for the effects of soil nonlinearity as well as the soil–pile interface nonlinearity on the response of piles, a range of low-to-high magnitude of pile head displacements is considered for the static case while a varying amplitude of harmonic accelerations for a wide range of frequencies is considered for the dynamic case. Experimental results are obtained in the form of pile head stiffnesses and strains generated in the pile under both the static and dynamic loadings. Results suggest that the nonlinear behavior of soil as well as the nonlinearity generated at the interface between the soil and the pile as the result of applied loading considerably affect the response of piles. The soil–pile interface nonlinearity that governs the slippage of pile shows a clear influence on the pile head stiffnesses by providing two distinct values of stiffnesses corresponding to the push and the pull directional movement of piles; the two values are significantly different. Axial and bending strains generated in the piles show expected dependency on the amplitude of applied loading; the pile head-level bending strain increases almost linearly with the increase in the angle of pile inclination.

     

利用视觉词袋模型和颜色直方图进行遥感影像检索

基于内容的遥感影像检索已经成为遥感领域的研究热点,因此,本文提出了一种综合视觉词袋模型和颜色直方图的遥感影像检索方法,利用尺度不变特征算子提取影像的局部不变特征,通过视觉词袋模型组合局部特征,生成每幅影像的金字塔直方图,接着结合每幅影像的颜色直方图生成更有区分性的特征向量,利用新的特征向量集训练支持向量机分类器,通过分类器输出与查询属于一类的影像,完成遥感影像检索。试验结果表明,本文方法不仅提高了影像检索的查准率和查全率,并且验证了该方法能有效克服影像光照、噪声、方向等变化,鲁棒性较好。     

Ecological effects of co-culturing the sea cucumber <Emphasis Type="Italic">Apostichopus japonicus</Emphasis> with the Chinese white shrimp <Emphasis Type="Italic">Fenneropenaeus chinensis</Emphasis> in an earthen pond

Using net enclosures in an earthen pond, we established three culture treatments with the sea cucumber Apostichopus japonicus and the Chinese white shrimp Fenneropenaeus chinensis: monoculture of sea cucumbers (C), monoculture of shrimp (S), and co-culture of the two species (CS). We measured levels of suspended particulate matter in the water column; total organic matter, total organic carbon, total nitrogen, and carbon/nitrogen ratios in both settling particles and the sediment; and chlorophyll a levels in the sediment. We then compared these variables between the three treatments. We also examined growth, survival, and yield of the two species in the different treatments. From June to September, the mean monthly suspended particulate matter sedimentation rates in the CS and S treatments were significantly (P<0.05) greater than those in the C treatment. From August to November, the mean monthly total organic matter, total organic carbon, total nitrogen, and chlorophyll a contents in the sediment in the CS and S treatments were significantly ( P <0.05) greater than those in the C treatment. Final wet weight, specific growth rate, survival rate, and total yield of sea cucumbers in co-culture were all significantly greater than those of sea cucumbers in monoculture. There were no significant differences among any of these variables for shrimp reared in the two systems. The bioturbation of the sediment and fecal production of the shrimp likely supplied natural food for the sea cucumbers. Co-culture of the two species is a viable option for increasing yield per unit area, maximizing use of the water body, and diversifying crop production.     

成岩作用对泥页岩储集性能的影响: 以东营凹陷古近系沙四上亚段为例*

陆相页岩油储集层孔隙结构特征及储集能力受泥页岩在埋藏过程中经历的复杂成岩改造影响,纵向上表现出显著的差异性,但相关研究仍不够深入。以渤海湾盆地东营凹陷古近系沙河街组沙四上亚段典型陆相富有机质泥页岩为研究对象,基于岩心观察描述、岩石薄片鉴定、扫描电镜等多尺度观察手段,结合X射线衍射分析、同位素地球化学分析、物性分析及能谱分析等测试资料,开展泥页岩成岩作用特征及其控储差异研究。研究结果表明: (1)研究区可识别出7种成岩作用类型,其中,建设性成岩作用以方解石重结晶、黏土矿物转化及白云石化作用为主; 沙四上亚段整体处于中成岩A阶段。(2)方解石重结晶、黏土矿物转化及白云石化作用在垂向上表现出显著的差异性演化特征,重结晶成因的亮晶方解石主要发育于纯上3小层与纯上2小层,黏土矿物转化所形成的晶间中—高孔区主要发育于纯上2小层; 研究区主要发育2种类型的白云石,其中,泥晶白云石主要发育于纯上3小层,微晶铁白云石主要发育于纯上1、2小层。(3)方解石重结晶和黏土矿物转化的协同使得纯上2小层产生了大量微孔,同时适量的铁白云石可作为骨架矿物支撑孔隙,有利于中深层孔隙的保存,是该小层成为优质储集层的关键。     

伊犁地区旅游资源开发构想

伊犁地区列入旅游资源的景点１３４个,其中一、二级景点共３８个。生物景观类和古迹与建筑类在一、二组景点中所占比生最大。以资源为基顾,以现有及预测客源市场为导向,拟议分期开发果子沟－－赛里木湖高山湖泊、森林、草原区,那拉提草原区,霍尔果斯口岩观光、购物区,唐布拉温泉疗养、草原度假区等八个旅游区。