两株河口湿地耐盐石油降解菌的生物学特性及降解能力研究

从辽河口湿地污染土壤样品中分离筛选出2株高效石油降解茵lhk-2和lhk-10,经鉴定lhk-2为巴氏萄萄球菌(Staphylococcus pasteuri),lhk-10为嗜麦芽寡养单胞菌(Stenotrophomonasmaltophili).两株菌的石油降解能力研究结果表明,培养8d后,加菌组的石油烃降解率均在...     

中太平洋YJA海山富钴结壳矿物组成与元素地球化学

研究样品采自马尔库斯（MARCUS）海脊YJA海山。利用等离子光谱、等离子质谱、X-射线衍射、红外光谱、场发射电镜等分析测试方法,对富钴结壳中不同构造层的矿物组成和元素地球化学进行了研究。该结壳为一大型板状新结壳,矿石矿物是水羟锰矿,脉石矿物是石英、斜长石、磷灰石等,微量矿物有蒙脱石、高岭石、钠沸石、水黑云母、片沸石等。从结壳的底部构造层到顶部构造层,TMn,Ni,Cu, Ba,Zn等元素的质量分数逐渐减少,TFe逐渐增加,Co变化不大;在相对疏松的构造层中,Si,Al,K,Na,Ca,Mg,Ti,P,Li,Rb等元素相对富集;结壳的稀土元素总量是1 982.27×10^-6,Ce具明显的正异常。不同构造层稀土元素的演化趋势是：Ce与Mn等元素相同,其他稀土元素（Y除外）与Fe等相似。     

Phillips模式的斜压不稳定的非线性饱和问题:能量情形

A conservation law for the Phillips model is derived. Using this law, the nonlinear saturation of purely baroclinic instability caused by the vertical velocity shear of the basic flow in the Phillips model-the case of energy-is studied within the context of Arnold's second stability theorem. Analytic upper bounds on the energy of wavy disturbances are obtained. For one unstable region in the parameter plane, the result here is a second-order correction in ε to Shepherd's; For another unstable region, the analytic upper bound on the energy of wavy disturbances offers an effective constraint on wavy (nonzonal) disturbances φ'i at any time.     

基于ARM7和USB技术的工业CT数据采集系统设计

针对传统工业CT体积大、成本高、传输速率低以及操作不便等问题,本文提出了一种基于ARM7和USB技术的工业CT数据采集系统设计方案。硬件采用32位的LPC2290作为核心控制器,设计了具有高集成度的信号调理电路和电机控制电路,并结合接口芯片CH376实现了高速高效、即插即用的USB传输;采用VC语言编写了上位机的采集控制软件,采用c语言和汇编语言混合编写了下位机的控制软件。软硬件联合测试结果说明：采集系统数据传输稳定可靠、高效便捷,步进电机控制方便精确,能够满足新型工业CT的发展要求。     

轻度沙埋对典型荒漠植物的影响北大核心CSCD

中国西北干旱区以荒漠生态系统为主体,是中国典型脆弱生态系统。沙埋对该区域植物生存和生长、植被分布和组成以及荒漠生态系统功能和结构有重要影响。以典型荒漠植物梭梭(Haloxylon ammodendron)、柽柳(Tamarix chinensis)、白刺(Nitraria tangutorum)、沙拐枣(Calligonum mongolicum)为研究对象,对比研究了轻度沙埋和非沙埋植物在生理和生长方面的差异,并从土壤盐分、土壤水分、土壤温度等方面探究了造成这种差异的原因。结果表明:轻度沙埋环境下,梭梭、柽柳、白刺、沙拐枣的光合速率普遍高于非沙埋植株,蒸腾速率显著低于非沙埋植株,水分利用效率也均高于非沙埋植株。轻度沙埋梭梭、柽柳、沙拐枣、白刺株高明显低于非沙埋植株,但地径、冠幅、叶面积指数普遍高于非沙埋植株。主要原因是轻度沙埋植物下方土壤黏粒含量、土壤湿度高于非沙埋植物下方,轻度沙埋植物下方土壤温度、含盐量低于非沙埋环境。     

Types and spatial combinations of Danxia landform of Fangyan in Zhejiang Province

The prominent types of Danxia landform in Fangyan include enclosed valleys, mesas, peaks, stone columns and grooves etc. Their spatial combinations have regular configurations along the northwest–southeast direction: typical grooves and caves are located in the northwestern Wufengshuyuan mainly; abundant fresh collapsed stones may be observed in central Jimingfeng and Taohuafeng; stone drums and stone columns are in the southeastern Shiguliao particularly; enclosed valleys are encircling joints of peaks and plains from three directions east, west, and south. Their spatial combinations reflect that the developments of Danxia landform have undergone stages of geomorphic cyclical erosion in the form of weathering, collapse, transportation, sedimentation and other processes, together with the “sculpture” of external forces mainly as tectonic uplift. The picturesque Danxia landform began its formation at that point. Danxia landform developed mainly in the strata of Fangyan Formation (K1f) caused by the alluvial fan-braided river phase of anterior fan in the late period of the Early Cretaceous. Regular patterns of weathering of stones and features of braided alluvial phase sediments may be verified by the analysis of three groups of experimental data. Danxia landform of Fangyan is a unique representative of the “adolescent” development type in the application of the World Natural Heritages status in China, by virtue of its outstanding universal aesthetic and scientific value.     

黔北煤田吴家寨地区晚二叠世煤层地球化学特征及聚煤环境分析

为了探讨煤层地球化学特征和成煤环境的关系,根据黔北煤田吴家寨地区上二叠统龙潭组煤样地球化学特征分析数据,评价了该地区晚二叠世煤的总体煤质特征,重点探讨了煤灰成分指数、微量元素和稀土元素与成煤环境的联系.结果表明,研究区灰成分指数(Fe2 O3+CaO+MgO)/(SiO2+Al2 O3)、SiO2+Al2 O3平均0....     

数码相机的畸变差检测研究

提出了一种检测面阵CCD数码相机畸变差的方法。首先利用标准三维检校场测定面阵CCD数码相 机的内方位元素和系统畸变系数,然后依据投影几何中空间直线经中心投影变换后仍是直线的原理,提出了 对面阵CCD数码相机随机畸变的检测和改正方法。利用该方法对UAVRS Ⅱ系统中的面阵数码相机的畸变 进行了检校,获取了满意的结果。     

小兴安岭伊春地区环斑花岗岩组合特征及其地质意义

通过1∶25万鹤岗市幅区域地质调查,首次在小兴安岭中南段摩天岭一带发现了具环斑结构的晚石炭世二长花岗岩.环斑长石多呈自形晶宽板状或宽板柱状,少数为圆球状.大小不一.2～3.5 cm,内核为肉红色碱性长石,外壳为宽1～2 mm的灰白色斜长石,有时也见无环的卵圆形斑晶.其岩相学、岩石地球化学特征研究表明,摩天岭环斑花岗岩及其岩石组合为不同于前寒武纪典型非造山环斑花岗岩的造山带型环斑花岗岩,为形成于造山带与板块俯冲体制有关的岛弧或活动大陆边缘环境下的Ⅰ型花岗岩.