电感耦合等离子体发射光谱法(ICP-AES)测定铀矿石中微量钪、硒、铼

用HF—HNO3—HClO4溶解样品，在0．6mol／L盐酸介质中，用ICP—AES法对铀矿石中钪(Sc)、硒(Se)、铼(Re)进行了测定．测得各元素的测定下限分别为：Sc0．03μg/mL、Se0．03μg/mL、Re0．016μg/mL．低、中、高3种浓度的平均标准加入回收率为96％～106％，相对标准偏差小于8％。     

阿坝高海拔地区多环境介质中硒的分布研究

对我国重要大骨节病区川西高海拔地区的岩石、表层土壤、沉积物、地表水和地下水进行采样分析,用原子荧光光谱法测定其中硒的质量分数.结果表明,该研究区域中多种环境介质中硒的质量分数均偏低,均低于相应国内环境介质中硒的平均质量分数.岩石中硒的质量分数范围为0.030~0.132μg/g,平均值为0.065μg/g.表土中硒的质量分数范围为0.075~0.204μg/g,均值为0.107μg/g.沉积物中硒的质量分数范围为0.069~0.310μg/g,均值为0.152μg/g.地表水中硒的质量浓度范围为nd~0.096μg/L,平均值为0.056μg/L.地下水中硒的质量浓度范围为nd~0.196μg/L,平均值为0.045μg/L.且岩石、表层土壤、地下水中硒的质量分数与海拔有较为显著的相关性,而沉积物和地表水中硒的质量分数无明显分布规律.     

起始斜率法测定枸札子中痕量硒的含量

提出基于在碱性条件下，Se（Ⅳ）催化硫代乙酰胺还原亚甲基蓝的反应作为指示反应，测定痕量硒的新催化动力学分析法。研究了催化反应的条件和影响因素，采用起始斜率法，测定了枸杞子样品中的微量硒含量，当硒含量在0．1～1．0μg／15mL范围内与褪色反应速率（d△A／dt）成正比，回归方程为y=0．0195x-0．0024，相关系数r=0．995。用于枸杞子中的硒的测定，测定结果的相对标准偏差为5．4％（n=4），加标回收率为90％～96％。     

荧光法测定食用菌中痕量硒的研究

研究一种用环己烷萃取2，3-二氨基萘衍生物进行痕量硒测定的荧光法．对测定过程中影响荧光强度的各种主要因素以及最佳条件的确定进行了探讨，建立一种新的荧光法测定硒．结果表明：该法的线性范围宽（1．30μg／L）、检出限低（0．22μg/L）、稳定性好，回收率在93．7％～104．4％之间，相对标准偏差小于2．9％．     

高压密封罐消解原子荧光光谱法同时测定茶叶中硒和锡的研究

建立密封消解原子荧光光谱法同时测定茶叶中硒和锡的方法．对密封消解原子荧光光谱法同时测定硒和锡的各参数条件进行研究．在最佳测试条件下,硒方法检出限为0．32μg／L,测定相对标准偏差为1．8％,样品加标回收率为96．4％～98．8％;锡方法检出限为0．30μg／L,测定相对标准偏差为3．5％,样品回收率为92．7％～102．0％．本法具有快速、准确、灵敏度高、精密度好等优点,用于茶叶中总硒和总锡的测定,结果满意．     

诱导动力学光度法测定微量硒的研究

本文研究了Se（IV）对Cr（VI）－I－－淀粉氧化还原反应体系的诱导作用，以此为基础提出了一种测定微量硒的动力学新方法，建立了测定的最佳条件。Se（IV）浓度在0～52．5μg／25ml范围内与诱导──—非诱导体系的吸光度差成正比，方法的检测限为0.02μg／ml。用本法测定了土壤中微量硒的含量，结果满意。     

诱导动力学光度法测定痕量硒—Se(Ⅳ)—Cr(Ⅵ)—Ⅰ~-—淀粉体系

以I_3~-—淀粉络合物为指示剂研究了Se(Ⅳ)对Cr(Ⅵ)—I~-氧化还原反应体系的诱导作用,并据此提出了一种测定痕量硒的动力学新方法;本法测定硒的线性范围为0～2.1μg/ml.方法检测限为7ng/ml Se(Ⅳ)。除Te(Ⅳ)、Fe(Ⅱ)和Sb(Ⅲ)外,其余离子具有较大允许共存量,可不经分离直接测定。用本法测定了铜矿标准物及污染土壤中的硒含量,结果满意。样品加标回收宰为95.8～97.9％,相对标准偏差RSD<2.9％。     

堇叶碎米荠营养成分的分析与评价

研究了堇叶碎米荠营养成分的质量分数，主要对堇叶碎米荠的含水率及主要的有机物质进行了定量的分析，结果表明：堇叶碎米荠中含有丰富的水分、蛋白质、可溶性糖、氨基酸、维生素C、纤维素以及硒，其质量分数分别为89．927％、9．467mg／g、0．353％、60．827mg／100g、49．327mg／100g、10．037％、26．408μg／g．且维生素C、纤维素、硒的含量明显高于同类蔬菜，具有极高的开发利用价值．     

豆腐柴蛋白质及氨基酸含量测定

实验采用考马斯亮蓝G—250比色法和茚三酮比色法分别测定恩施产豆腐柴可溶性蛋白质和总氨基酸的含量，结果表明：豆腐柴叶中蛋白质含量为115μg/g，氨基酸含量为628.34μg/g．     

耐盐性高吸水性树脂的合成工艺

采用水溶液法对合成耐盐性高吸水性树脂(SAP)的工艺条件进行了研究。得到最佳反应条件：聚合温度为50—60℃，聚合时间为3h，引发剂[(NH4)2S2O8]与淀粉的质量比为0．4％—0．6％，单体与淀粉的质量比为6—8，丙烯酰胺(AM)与丙烯酸(AA)的质量比为0．3—0．4．制得SAP的吸水率为400—700g/g，对0．9％ NaCl溶液的吸液率为100—130g/g，产品的吸水性和吸盐性均有明显提高。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.