ICP-AES法测定仲钨酸铵中微量硼

为了解决高纯仲钨酸铵中杂质元素硼的测定问题 ,采用ICP AES测定方法 ,对测定中基体效应及光谱干扰进行了研究 ,考察了酸度、蒸干程度、放置时间等因素对钨的沉淀程度及硼的回收率的影响 ;此外 ,将基体分离与干扰系数校正法相结合 ,建立了简便、快速、准确测定高纯仲钨酸铵中微量硼的新方法 .结果表明 :用该法测定硼的回收率大于 95 .8% ,测定仲钨酸铵中 0 0 0 0x%～ 0 0 0x%硼的相对标准偏差小于 3% ,其准确度及精密度均符合要求 ,能用于出口产品控制分析 .     

ICP-AES法同时测定高纯碳酸锂中11种杂质元素

研究了用ICP-AES法同时测定高纯碳酸锂中11种杂质元素Al、Ba、Cu、K、Na、P、Pb、Ca、Fe、Mg、Mn的分析方法.确定了方便快速测定高纯碳酸锂中11种杂质元素的条件.该方法的回收率为93.3％～107.2％,RSD小于6.1％.     

电感耦合等离子体光谱法测定高纯金中杂质元素的方法优化

以乙酸乙酯为萃取剂萃取分离高纯金中的杂质,采用电感耦合等离子体发射光谱仪测定其含量,并对萃取过程、测定方法及仪器条件进行了研究.测得被测杂质元素的检出限为0.000 02%~0.000 10%,回收率为93.1%~107.7%,相对标准偏差小于4%,结果令人满意.     

ICP-MS在高纯稀土氧化物分析中的应用

综述了1990～2006年问有关高纯稀土氧化物中痕量金属杂质电感耦合等离子体（ICP—MS）检测法的研究进展，内容包括ICP—MS应用中存在的主要问题、ICP—MS直接测定高纯稀土材料中痕量杂质以及分离技术与ICP—MS联用测定高纯稀土材料中痕量杂质技术。     

微量取样——火焰原子吸收法连续测定稀土化合物中的铜铅铁镍

作萤光粉用的氧化钇和氧化铕要求测定铜、铅、铁、镍等杂质的含量。我们曾建立了利用微量萃取和微量取样技术相结合测定高纯稀土氧化物中铜、铅、铁、镍的方法,但因作为制备高纯氧化物的原料或其它粗产品中杂质含量较高,需要建立适合于分析这类样品的简单、快速的分析方法。本文研究了用微量取样技术从少量稀土溶液中直接连续测定铜、铅、铁、镍的方法。此法的优点是:1,取样量少。这对于某些难得的贵重稀土(如铕)的分析是非常重要的;2.由于取样少,溶解样品所需的试剂少,溶     

ICP-AES测定高纯钨中杂质元素

采用电感耦合等离子体原子发射光谱法（即ＩＣＰＡＥＳ法）测定钨中的１４种杂质元素,并对１９种微量元素的基体效应和光谱干扰进行了研究,建立了ＩＣＰＡＥＳ与基体分离及干扰系数校正相结合的方法．此法解决了钨在分析测定时的基体干扰问题,能快速、准确、同时测定高纯钨中１４种微量元素,回收率高于９０％,相对标准偏差为１％～６％．它为钨产品的检测提供了新的切实可行的分析手段．     

阳极溶出伏安法同时测定高纯铟中的铅和镉

本文提出了一种在酒石酸铵—氨水体系中用阳极溶出伏安法同时测定高纯铟中痕量杂质铅和镐的新方法,工艺简单而且精密度高。不需预先和基体分离,在一定条件下对高纯铟样品进行测定．测定限铅可达1×10-1％．镉可达1×10－5％、铅、镉平均加标回收率均可达99％以上。     

水合肼还原高纯硝酸银的ICP-AES同时测定其9种杂质元素的方法研究

研究建立高纯硝酸银中杂质元素的简便而快速的分离、富集与测试方法在实践中具有重大意义.为解决以前存在的步骤烦琐问题,采用乙二胺四乙酸二钠盐(EDTA)作杂质元素的络合保护剂、氨水溶解硝酸银、水合肼还原沉淀除去硝酸银中的大量银,挥发氯化铵后用ICP-AES法直接测定主要杂质元素,建立了感光级高纯硝酸银中Bi、Cd、Fe、Cr、Ni、Mn、Cu、Pb、Pd同时快速ICP-AES测定法.实验结果表明:当上述元素含量高于50 ng/g时,回收率为92.4%～113.8%,相对标准偏差RSD小于3.2%,测定结果满意.     

矿石中铌钽的光谱分析

本文进行了花岗岩中铌钽的直接光谱测定。同时观察了基物组成改变对铌钽测定结果的影响。分析线对采用Nb2927.8A/Mo2930.5A及Ta2685.1A/Mo2683.2A.测定的浓度低限为0.03%(以氧化物计算)。均方误差铌为±11.0%(浓度0.1%)及±8.1%(浓度1%),钽为±15.9%(浓度0.1%)及±13.6%(浓度1%)。在花岗岩,石英,辉石,钾长石,方解石中观察了成分变化对铌钽测定的影响。最后用本方法进行了实物分析。     

X射线荧光光谱法熔融制样测定矿物中的铌钽

建立了一种准确度高,操作简便的铌钽矿物中铌钽含量的熔片X射线荧光光谱分析法。设计制备了标准样品,对仪器参数、稀释比等条件进行了优化,对干扰元素进行了谱线重叠校正和吸收增强校正。十次测量结果表明,Nb2O5相对标准偏差0.86%,Ta2O5相对标准偏差0.58%。对实际样品进行测定,测定结果与ICP法及化学法结果一致。     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.